NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Abstract

This non-oriented electrical steel sheet has a predetermined chemical composition, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, 0.20?S.sub.tyl/S.sub.tot?0.85, 0.05?S.sub.100/S.sub.tot?0.80, S.sub.100/S.sub.tot?0.5, and K.sub.100/K.sub.tyl?0.990 are satisfied.

Claims

1. A non-oriented electrical steel sheet comprising, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, Formulas (3) to (6) are satisfied,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00% (1)
M=(cos ??cos ?).sup.?1(2)
0.20?S.sub.tyl/S.sub.tot?0.85(3)
0.05?S.sub.100/S.sub.tra?0.80(4)
S.sub.100/S.sub.tra?0.50(5)
K.sub.100/K.sub.tyl?0.990(6) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

2. The non-oriented electrical steel sheet according to claim 1, wherein, in a case where an average KAM value of the orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by K.sub.tra, Formula (7) is satisfied,
K.sub.100/K.sub.tra<1.010(7).

3. The non-oriented electrical steel sheet according to claim 1, wherein, in a case where an area of {110} orientated grains is indicated by S.sub.110, Formula (8) is satisfied,
S.sub.100/S.sub.110?1.00(8) here, it is assumed that Formula (8) is satisfied even when an area ratio S.sub.100/S.sub.110 diverges to infinity.

4. The non-oriented electrical steel sheet according to claim 1, wherein, in a case where an average KAM value of {110} orientated grains is indicated by K.sub.110, Formula (9) is satisfied,
K.sub.100/K.sub.110<1.010(9).

5. A non-oriented electrical steel sheet comprising, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, an average grain size in an observation region is indicated by d.sub.ave, an average grain size of the {100} orientated grains is indicated by d.sub.100, and an average grain size of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by d.sub.tyl, Formulas (10) to (15) are satisfied,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00% (1)
M=(cos ??cos ?).sup.?1(2)
S.sub.tyl/S.sub.tot?0.70(10)
0.20?S.sub.100/S.sub.tot(11)
S.sub.100/S.sub.tra?0.55(12)
K.sub.100/K.sub.tyl?1.010(13)
d.sub.100/d.sub.ave>1.00(14)
d.sub.100/d.sub.tyl>1.00(15) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

6. The non-oriented electrical steel sheet according to claim 5, wherein, in a case where an average KAM value of the orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by K.sub.tra, Formula (16) is satisfied,
K.sub.100/K.sub.tra<1.010(16).

7. The non-oriented electrical steel sheet according to claim 5, wherein, in a case where an average grain size of the orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by d.sub.tra, Formula (17) is satisfied,
d.sub.100/d.sub.tra>1.00(17).

8. The non-oriented electrical steel sheet according to claim 5, wherein, in a case where an area of {110} orientated grains is indicated by S.sub.110, Formula (18) is satisfied,
S.sub.100/S.sub.110?1.00(18) here, it is assumed that Formula (18) is satisfied even when an area ratio S.sub.100/S.sub.110 diverges to infinity.

9. The non-oriented electrical steel sheet according to claim 5, wherein, in a case where an average KAM value of {110} orientated grains is indicated by K.sub.110, Formula (19) is satisfied,
K.sub.100/K.sub.110<1.010(19).

10. A method for manufacturing the non-oriented electrical steel sheet according to claim 5, the method comprising: performing a heat treatment on the non-oriented electrical steel sheet which includes, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, Formulas (3) to (6) are satisfied at a temperature of 700? C. to 950? C. for 1 second to 100 seconds,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00%(1)
M=(cos ??cos ?).sup.?1(2)
0.20?S.sub.tyl/S.sub.tot?0.85(3)
0.05?S.sub.100/S.sub.tra?0.80(4)
S.sub.100/S.sub.tra?0.50(5)
K.sub.100/K.sub.tyl?0.990(6) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

11. A non-oriented electrical steel sheet comprising, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average grain size in an observation region is indicated by d.sub.ave, an average grain size of the {100} orientated grains is indicated by d.sub.100, and an average grain size of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by d.sub.tyl, Formulas (20) to (24) are satisfied,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00% (1)
M=(cos ??cos ?).sup.?1(2)
S.sub.tyl/S.sub.tot<0.55(20)
S.sub.100/S.sub.tot>0.30(21)
S.sub.100/S.sub.tra?0.60(22)
d.sub.100/d.sub.ave?0.95(23)
d.sub.100/d.sub.tyl?0.95(24) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

12. The non-oriented electrical steel sheet according to claim 11, wherein, in a case where an average grain size of the orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by d.sub.tra, Formula (25) is satisfied,
d.sub.100/d.sub.tra?0.95(25).

13. A method for manufacturing the non-oriented electrical steel sheet, comprising: performing a heat treatment on the non-oriented electrical steel sheet according to claim 1 at a temperature of 950? C. to 1050? C. for 1 second to 100 seconds or at a temperature of 700? C. to 900? C. for longer than 1000 seconds.

14. A method for manufacturing the non-oriented electrical steel sheet, comprising: performing a heat treatment on the non-oriented electrical steel sheet according to claim 5 at a temperature of 950? C. to 1050? C. for 1 second to 100 seconds or at a temperature of 700? C. to 900? C. for longer than 1000 seconds.

15. A method for manufacturing the non-oriented electrical steel sheet according to claim 6, the method comprising: performing a heat treatment on the non-oriented electrical steel sheet which includes, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, Formulas (3) to (6) are satisfied, at a temperature of 700? C. to 950? C. for 1 second to 100 seconds,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00% (1)
M=(cos ??cos ?).sup.?1(2)
0.20?S.sub.tyl/S.sub.tot?0.85(3)
0.05?S.sub.100/S.sub.tra?0.80(4)
S.sub.100/S.sub.tra?0.50(5)
K.sub.100/K.sub.tyl?0.990(6) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

16. A method for manufacturing the non-oriented electrical steel sheet according to claim 7, the method comprising: performing a heat treatment on the non-oriented electrical steel sheet which includes, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, Formulas (3) to (6) are satisfied, at a temperature of 700? C. to 950? C. for 1 second to 100 seconds,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00% (1)
M=(cos ??cos ?).sup.?1(2)
0.20?S.sub.tyl/S.sub.tot?0.85(3)
0.05?S.sub.100/S.sub.tra?0.80(4)
S.sub.100/S.sub.tra?0.50(5)
K.sub.100/K.sub.tyl?0.990(6) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

17. A method for manufacturing the non-oriented electrical steel sheet according to claim 8, the method comprising: performing a heat treatment on the non-oriented electrical steel sheet which includes, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, Formulas (3) to (6) are satisfied, at a temperature of 700? C. to 950? C. for 1 second to 100 seconds,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00% (1)
M=(cos ??cos ?).sup.?1(2)
0.20?S.sub.tyl/S.sub.tot?0.85(3)
0.05?S.sub.100/S.sub.tra?0.80(4)
S.sub.100/S.sub.tra?0.50(5)
K.sub.100/K.sub.tyl?0.990(6) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

18. A method for manufacturing the non-oriented electrical steel sheet according to claim 9, the method comprising: performing a heat treatment on the non-oriented electrical steel sheet which includes, as a chemical composition, by mass %; Si: 1.50% to 4.00%; one or more of Mn, Ni, Co, Pt, Pb, Cu, and Au: less than 2.50% in total; C: 0.0100% or less; sol. Al: 4.00% or less; S: 0.0400% or less; N: 0.0100% or less; Sn: 0.00% to 0.40%; Sb: 0.00% to 0.40%; P: 0.00% to 0.40%; Cr: 0.001% to 0.100%; B: 0.0000% to 0.0050%; O: 0.0000% to 0.0200%; one or more of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, in which, when a Mn content (mass %) is indicated by [Mn], a Ni content (mass %) is indicated by [Ni], a Co content (mass %) is indicated by [Co], a Pt content (mass %) is indicated by [Pt], a Pb content (mass %) is indicated by [Pb], a Cu content (mass %) is indicated by [Cu], a Au content (mass %) is indicated by [Au], a Si content (mass %) is indicated by [Si], and a sol. Al content (mass %) is indicated by [sol. Al], Formula (1) is satisfied; and a remainder of Fe and impurities, wherein, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by S.sub.tot, an area of {100} orientated grains is indicated by S.sub.100, an area of orientated grains in which a Taylor factor M according to Formula (2) becomes more than 2.8 is indicated by S.sub.tyl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by S.sub.tra, an average KAM value of the {100} orientated grains is indicated by K.sub.100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by K.sub.tyl, Formulas (3) to (6) are satisfied, at a temperature of 700? C. to 950? C. for 1 second to 100 seconds,
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])?([Si]+[sol. Al])?0.00% (1)
M=(cos ??cos ?).sup.?1(2)
0.20?S.sub.tyl/S.sub.tot?0.85(3)
0.05?S.sub.100/S.sub.tra?0.80(4)
S.sub.100/S.sub.tra?0.50(5)
K.sub.100/K.sub.tyl?0.990(6) here, ? in Formula (2) represents an angle formed by a stress vector and a slip direction vector of a crystal, and ? represents an angle formed by the stress vector and a normal vector of a slip plane of the crystal.

Description

EXAMPLES

[0244] Next, the non-oriented electrical steel sheet of the present invention will be specifically described while describing examples. The examples to be described below are simply examples of the non-oriented electrical steel sheet of the present invention, and the non-oriented electrical steel sheet of the present invention is not limited to the following examples.

First Example

[0245] Molten steel was cast, thereby producing ingots having chemical compositions shown in Table 1A below. Here, the column Left side of Formula (1) indicates the values of the left side of Formula (1) described above. After that, the produced ingots were hot-rolled by being heated up to 1150? C. and rolled such that the sheet thicknesses became as shown in Table 1B. In addition, after the end of finish rolling, the hot-rolled steel sheets were cooled with water and coiled. The temperatures (finish temperatures) in a stage of the final pass of the finish rolling at this time were 830? C., and the coiling temperatures were within a range of 500? C. to 700? C.

[0246] Next, hot-rolled sheet annealing was performed on the hot-rolled steel sheets under conditions shown in Table 1B for 30 seconds, scales were removed by pickling, and cold rolling was performed at rolling reductions shown in Table 1B. In addition, intermediate annealing was performed in a non-oxidizing atmosphere at 800? C. for 30 seconds. Next, the second round of cold rolling (skin pass rolling) was performed at rolling reductions shown in Table 1B. Although not shown in the table, the average grain sizes after the skin pass rolling were in a range of 25 to 30 ?m.

[0247] Next, in order to investigate the texture, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSD observation (step intervals: 100 nm) was performed on the processed surface (surface parallel to the steel sheet surface) in the above-described manner. The areas and average KAM values of kinds shown in Table 2 were obtained by EBSD observation.

[0248] In addition, as a second heat treatment, annealing was performed on the steel sheets at 800? C. for 2 hours. From each of the steel sheets after the second heat treatment, 55 mm?55 mm sample pieces were collected as measurement samples. The samples were collected using a shearing machine. Additionally, as magnetic characteristics, the iron losses W10/400 (the average value of energy losses generated in the rolling direction and in the width direction in the test piece during excitation at a maximum magnetic flux density of 1.0 T and a frequency of 400 Hz), W15/50 (C) (the value of an energy loss generated in the width direction in the test piece during excitation at a maximum magnetic flux density of 1.5 T and a frequency of 50 Hz), and W15/50 (L) (the value of an energy loss generated in the rolling direction in the test piece during excitation at a maximum magnetic flux density of 1.5 T and a frequency of 50 Hz) were measured according to JIS C 2556 (2015).

[0249] In addition, W15/50 (C) was divided by W15/50 (L) to obtain W15/50 (C)/W15/50 (L).

[0250] The measurement results are shown in Table 2.

TABLE-US-00001 TABLE 1A Chemical composition (mass %, remainder is Fe and impurities) Left side of For- mula No. C Si sol. Al S N Mn Ni Co Pt Pb Cu Au Cr Mg B O (1) 101 0.0009 3.20 0.59 0.0019 0.0018 0.21 0.003 ?3.58 102 0.0010 3.19 0.60 0.0021 0.0021 0.21 0.002 ?3.59 103 0.0010 3.19 0.59 0.0020 0.0019 0.20 0.004 ?3.58 104 0.0010 3.20 0.61 0.0020 0.0021 0.20 0.004 ?3.60 105 0.0009 3.20 0.59 0.0022 0.0021 0.20 0.003 ?3.59 106 0.0009 3.21 0.59 0.0018 0.0016 0.19 0.003 ?3.61 107 0.0011 3.19 0.60 0.0021 0.0022 0.19 0.004 ?3.60 108 0.0010 2.01 0.31 0.0022 0.0024 2.40 0.003 0.09 109 0.0009 3.20 0.59 0.0019 0.0019 0.20 0.003 ?3.59 110 0.0009 3.20 0.61 0.0018 0.0017 0.20 0.002 ?3.61 111 0.0011 3.21 0.59 0.0020 0.0020 0.20 0.003 ?3.60 112 0.0010 3.19 0.59 0.0019 6.0019 0.21 0.003 ?3.58 113 0.0009 3.19 0.59 0.0018 0.0018 0.21 0.002 ?3.58 114 0.0011 3.19 0.60 0.0018 0.0019 0.19 0.003 ?3.60 115 0.0008 3.19 0.60 0.0020 0.0016 0.22 0.003 ?3.57 116 0.0011 3.20 0.60 0.0019 0.0019 0.20 0.002 ?3.60 117 0.0010 3.19 0.58 0.0018 0.0019 0.22 0.003 ?3.56 118 0.0011 3.19 0.58 0.0017 0.0017 0.21 0.004 ?3.57 119 0.0010 3.21 0.60 0.0020 0.0018 0.21 0.003 ?3.60 120 0.0010 3.19 0.59 0.0019 0.0019 0.21 0.003 ?3.57 121 0.0008 3.21 0.60 0.0018 0.0016 0.21 0.003 ?3.60 122 0.0010 3.20 0.60 0.0018 0.0019 0.20 0.004 ?3.59 123 0.0009 3.20 0.60 0.0020 0.0019 0.21 0.004 ?3.60 124 0.0085 3.23 0.60 0.0017 0.0021 0.21 0.003 ?3.62 125 0.0008 1.61 0.60 0.0020 0.0019 0.22 0.003 1.99 126 0.0008 3.90 0.59 0.0017 0.0020 0.21 0.003 ?4.28 127 0.0011 3.22 0.00 0.0021 0.0019 0.22 0.004 ?3.00 128 0.0008 3.23 2.80 0.0018 0.0019 0.22 0.004 ?5.81 129 0.0010 3.23 0.60 0.0003 0.0019 0.21 0.003 ?3.62 130 0.0008 3.23 0.60 0.0090 0.0021 0.22 0.004 ?3.60 131 0.0011 3.22 0.60 0.0018 0.0093 0.21 0.004 ?3.61 132 0.0008 3.23 0.61 0.0018 0.0021 0.21 0.004 0.0005 ?3.63 133 0.0008 3.22 0.61 0.0351 0.0020 0.21 0.004 0.0093 ?3.62 134 0.0009 3.22 0.60 0.0020 0.0018 0.22 0.001 ?3.60 135 0.0008 3.22 0.61 0.0017 0.0020 0.23 0.094 ?3.60 136 0.0009 3.23 0.61 0.0019 0.0022 0.22 0.003 ?3.61 137 0.0009 3.21 2.80 0.0018 0.0020 2.40 0.003 ?3.62 138 0.0008 3.19 0.59 0.0020 0.0019 0.21 0.002 0.0002 ?3.58 139 0.0009 3.19 0.60 0.0017 0.0016 0.21 0.003 0.0045 ?3.58 140 0.0008 3.20 0.60 0.0018 0.0019 0.21 0.003 0.0013 ?3.58 141 0.0009 3.21 0.59 0.0018 0.0019 0.21 0.002 0.0170 ?3.58 142 0.0118 3.22 0.60 0.0020 0.0019 0.20 0.002 ?3.62 143 0.0008 1.40 0.60 0.0018 0.0018 0.20 0.002 ?1.80 144 0.0011 4.21 0.60 0.0017 0.0020 0.20 0.003 ?4.61 145 0.0009 3.23 4.20 0.0017 0.0020 0.20 0.003 ?7.23 146 0.0011 3.22 0.61 0.0450 0.0020 0.21 0.004 ?3.62 147 0.0010 3.23 0.61 0.0019 0.0119 0.21 0.003 ?3.63 148 0.0008 3.23 0.60 0.0017 0.0021 0.21 0.000 ?3.62 149 0.0009 3.22 0.60 0.0018 0.0020 0.22 0.119 ?3.61 150 0.0010 3.22 0.61 0.0017 0.0018 2.60 0.004 ?1.24 151 0.0009 3.20 0.59 0.0017 0.0018 0.21 0.002 ?3.58

TABLE-US-00002 TABLE 1B After hot Hot-rolled sheet rolling annealing Sheet Annealing Rolling reduction (%) thickness temperature Cold Skin pass No. (mm) (? C.) rolling rolling Note 101 2.50 1050 92 10 Invention Example 102 2.50 1050 92 10 Invention Example 103 2.50 1050 92 10 Invention Example 104 2.50 1050 92 10 Invention Example 105 2.50 1050 92 10 Invention Example 106 2.50 1050 92 10 Invention Example 107 2.50 1050 92 10 Invention Example 108 2.50 1050 92 10 Comparative Example 109 2.50 850 92 10 Comparative Example 110 1.33 850 85 10 Comparative Example 111 0.50 1050 60 10 Comparative Example 112 2.50 1050 92 3 Comparative Example 113 2.50 1050 92 15 Invention Example 114 2.50 1050 92 25 Invention Example 115 2.50 1002 92 10 Invention Example 116 2.50 1100 92 10 Invention Example 117 2.50 950 92 10 Comparative Example 118 2.50 1050 95 10 Invention Example 119 2.50 1050 97 Cracking Comparative Example occurs during cold rolling 120 2.50 1050 88 10 Comparative Example 121 2.50 1050 92 5 Invention Example 122 2.50 1100 95 20 Invention Example 123 2.50 1150 95 30 Comparative Example 124 2.50 1050 92 10 Invention Example 125 2.50 1050 92 10 Invention Example 126 2.50 1050 92 10 Invention Example 127 2.50 1050 92 10 Invention Example 128 2.50 1050 92 10 Invention Example 129 2.50 1050 92 10 Invention Example 130 2.50 1050 92 10 Invention Example 131 2.50 1050 92 10 Invention Example 132 2.50 1050 92 10 Invention Example 133 2.50 1050 92 10 Invention Example 134 2.50 1050 92 10 Invention Example 135 2.50 1050 92 10 Invention Example 136 2.50 1050 92 10 Invention Example 137 2.50 1050 92 10 Invention Example 138 2.50 1050 92 10 Invention Example 139 2.50 1050 92 10 Invention Example 140 2.50 1050 92 10 Invention Example 141 2.50 1050 92 10 Invention Example 142 2.50 1050 92 10 Comparative Example 143 2.50 1050 92 10 Comparative Example 144 2.50 1050 92 Cracking Comparative Example occurs during cold rolling 145 2.50 1050 92 Cracking Comparative Example occurs during cold rolling 146 2.50 1050 92 10 Comparative Example 147 2.50 1050 92 10 Comparative Example 148 2.50 1050 92 10 Comparative Example 149 2.50 1050 92 10 Comparative Example 150 2.50 1050 92 Cracking Comparative Example occurs during cold rolling 151 2.50 1010 90 10 Invention Example

TABLE-US-00003 TABLE 2 After second EBSD observation result after skin pass rolling heat treatment S / S.sub.100/ S.sub.100/ K.sub.100/ K.sub.100/ S.sub.100/ K.sub.100/ W10/400 W15/50(C)/ No. K K K.sub.100 K.sub.110 S S S K K S.sub.110 K.sub.110 (W/kg) W15/50(L) Note 101 0.371 0.364 0.363 0.365 0.72 0.15 0.72 0.980 0.997 5.581 0.996 10.5 1.08 Invention Example 102 0.372 0.363 0.362 0.365 0.74 0.14 0.73 0.975 0.998 5.599 0.993 10.5 1.10 Invention Example 103 0.371 0.363 0.364 0.365 0.74 0.16 0.71 0.981 1.002 5.580 0.996 10.6 1.11 Invention Example 104 0.370 0.363 0.364 0.364 0.73 0.16 0.72 0.983 1.002 5.613 1.000 10.6 1.08 Invention Example 105 0.371 0.363 0.363 0.366 0.74 0.16 0.72 0.978 1.000 5.596 0.993 10.5 1.08 Invention Example 106 0.371 0.363 0.362 0.365 0.72 0.15 0.71 0.976 0.998 5.595 0.994 10.4 1.09 Invention Example 107 0.370 0.364 0.363 0.366 0.73 0.15 0.73 0.980 0.997 5.592 0.992 10.6 1.09 Invention Example 108 0.370 0.364 0.363 0.365 0.89 0.03 0.71 0.979 0.996 1.505 0.994 15.6 1.39 Comparative Example 109 0.372 0.363 0.363 0.365 0.88 0.15 0.72 0.978 0.999 5.582 0.994 12.2 1.39 Comparative Example 110 0.371 0.363 0.363 0.364 0.72 0.02 0.72 0.977 0.999 5.586 0.996 12.4 1.40 Comparative Example 111 0.371 0.364 0.364 0.364 0.73 0.16 0.24 0.980 1.001 0.287 0.998 12.3 1.39 Comparative Example 112 0.362 0.364 0.363 0.365 0.72 0.15 0.73 1.003 0.995 5.584 0.994 12.4 1.40 Comparative Example 113 0.371 0.355 0.365 0.366 0.73 0.14 0.72 0.985 1.027 5.607 0.998 11.3 1.12 Invention Example 114 0.371 0.366 0.362 0.357 0.73 0.15 0.72 0.976 0.990 5.602 1.015 11.2 1.13 Invention Example 115 0.370 0.365 0.365 0.364 0.72 0.14 0.72 0.987 1.001 5.580 1.003 10.7 1.07 Invention Example 116 0.371 0.364 0.361 0.365 0.72 0.16 0.72 0.975 0.993 5.582 0.991 10.4 1.08 Invention Example 117 0.370 0.362 0.362 0.365 0.87 0.14 0.72 0.979 0.999 5.582 0.990 12.0 1.42 Comparative Example 118 0.371 0.365 0.362 0.365 0.73 0.15 0.71 0.974 0.991 5.582 0.990 9.0 1.10 Invention Example 119 Not evaluated since cracking occurs during cold rolling Comparative Example 120 0.373 0.364 0.364 0.365 0.73 0.15 0.23 0.976 0.998 0.288 0.997 12.3 1.38 Comparative Example 121 0.369 0.365 0.361 0.365 0.73 0.15 0.73 0.980 0.990 5.579 0.991 10.6 1.11 Invention Example 122 0.371 0.365 0.362 0.364 0.23 0.74 0.72 0.975 0.992 5.580 0.994 10.5 1.11 Invention Example 123 0.370 0.365 0.364 0.365 0.17 0.82 0.72 0.984 0.996 5.582 0.998 12.4 1.38 Comparative Example 124 0.370 0.366 0.363 0.364 0.73 0.14 0.73 0.982 0.993 5.580 1.000 10.7 1.10 Invention Example 125 0.371 0.362 0.364 0.366 0.73 0.14 0.72 0.982 1.004 5.583 0.995 10.8 1.08 Invention Example 126 0.370 0.364 0.361 0.366 0.72 0.14 0.73 0.978 0.992 5.582 0.988 10.1 1.10 Invention Example 127 0.372 0.365 0.364 0.367 0.73 0.15 0.72 0.978 0.997 5.580 0.993 10.8 1.07 Invention Example 128 0.370 0.363 0.363 0.364 0.72 0.14 0.72 0.984 1.002 5.582 0.998 10.2 1.08 Invention Example 129 0.370 0.363 0.363 0.363 0.71 0.14 0.73 0.981 1.000 5.581 1.001 10.1 1.10 Invention Example 130 0.370 0.364 0.362 0.366 0.72 0.15 0.71 0.978 0.994 5.581 0.988 10.7 1.08 Invention Example 131 0.369 0.366 0.365 0.365 0.72 0.15 0.71 0.988 0.998 5.581 1.000 10.8 1.13 Invention Example 132 0.370 0.366 0.364 0.365 0.72 0.15 0.72 0.983 0.996 5.582 0.998 10.6 1.09 Invention Example 133 0.369 0.363 0.362 0.366 0.73 0.16 0.73 0.980 0.998 5.582 0.989 10.5 1.07 Invention Example 134 0.371 0.363 0.362 0.363 0.72 0.15 0.72 0.975 0.997 5.579 0.998 10.7 1.08 Invention Example 135 0.371 0.364 0.365 0.363 0.72 0.15 0.72 0.981 1.001 5.581 1.005 10.3 1.10 Invention Example 136 0.372 0.364 0.363 0.363 0.73 0.16 0.72 0.974 0.996 5.580 0.999 10.6 1.09 Invention Example 137 0.370 0.364 0.363 0.363 0.71 0.15 0.72 0.980 0.998 5.581 0.998 9.9 1.10 Invention Example 138 0.372 0.363 0.365 0.365 0.73 0.14 0.72 0.981 1.005 5.583 0.999 10.3 1.10 Invention Example 139 0.371 0.366 0.362 0.364 0.72 0.14 0.73 0.975 0.990 5.581 0.993 10.5 1.11 Invention Example 140 0.370 0.365 0.364 0.366 0.71 0.16 0.72 0.983 0.997 5.582 0.995 10.1 1.09 Invention Example 141 0.371 0.364 0.362 0.364 0.72 0.14 0.71 0.976 0.996 5.581 0.994 10.5 1.12 Invention Example 142 0.369 0.364 0.362 0.365 0.88 0.03 0.71 0.980 0.993 1.506 0.992 15.6 1.42 Comparative Example 143 0.370 0.365 0.363 0.366 0.89 0.02 0.71 0.982 0.996 1.504 0.992 15.6 1.39 Comparative Example 144 Not evaluated since cracking occurs during cold rolling Comparative Example 145 Not evaluated since cracking occurs during cold rolling Comparative Example 146 0.371 0.364 0.361 0.364 0.88 0.03 0.72 0.974 0.992 1.507 0.993 15.7 1.41 Comparative Example 147 0.369 0.366 0.363 0.364 0.88 0.04 0.72 0.985 0.993 1.505 0.999 15.7 1.42 Comparative Example 148 0.369 0.363 0.364 0.367 0.89 0.02 0.72 0.988 1.004 1.504 0.994 15.6 1.40 Comparative Example 149 0.369 0.364 0.362 0.364 0.88 0.03 0.72 0.981 0.994 1.506 0.993 15.6 1.40 Comparative Example 150 Not evaluated since cracking occurs during cold rolling Comparative Example 151 0.369 0.365 0.364 0.366 0.73 0.09 0.75 0.987 0.996 0.901 0.995 10.4 1.18 Invention Example indicates data missing or illegible when filed

[0251] Underlined values in Table 1A, Table 1B, and Table 2 indicate conditions deviating from the scope of the present invention. In all of No. 101 to No. 107, No. 113 to No. 116, No. 118, No. 121, No. 122, No. 124 to No. 141, and No. 151, which are invention examples, the iron losses W10/400 were favorable values.

[0252] On the other hand, in No. 108, which is a comparative example, the Mn concentration was high, and the value of the left side of Formula (1) was more than 0.00 (a composition that underwent ?-? transformation), which made the area ratio S.sub.tyl/S.sub.tot and the area ratio S.sub.100/S.sub.tot each deviate from the range of Formula (3) or Formula (4). As a result, the iron loss W10/400 was high.

[0253] In No. 109 to No. 112, No. 117, No. 120, and No. 123, which are comparative examples, since at least any of the temperature in the hot-rolled sheet annealing, the rolling reduction in the cold rolling, and the rolling reduction in the skin pass rolling was not optimal, any of Formula (3) to Formula (6) was not satisfied, and, as a result, the iron losses W10/400 were high.

[0254] In addition, in No. 119, which is a comparative example, since the rolling reduction of the cold rolling was too high, cracking occurred, and the process could not proceed to the subsequent steps.

[0255] In No. 142 to No. 150, since the chemical compositions were outside the scope of the present invention, Formula (3) and Formula (4) were not satisfied, and the iron losses W10/400 became high or cracking occurred during the cold rolling.

Second Example

[0256] Molten steel was cast, thereby producing ingots having chemical compositions shown in Table 3A. Here, the column Left side of Formula (1) indicates the values of the left side of Formula (1) described above. After that, the produced ingots were hot-rolled by being heated up to 1150? C. and rolled such that the sheet thicknesses became as shown in Table 3B. In addition, after the end of finish rolling, the hot-rolled steel sheets were cooled with water and coiled. The temperatures (finish temperatures) in a stage of the final pass of the finish rolling at this time were 830? C., and the coiling temperatures were within a range of 500? C. to 700? C.

[0257] Next, hot-rolled sheet annealing was performed on the hot-rolled steel sheets under conditions shown in Table 3B for 30 seconds, scales were removed by pickling, and cold rolling was performed at rolling reductions shown in Table 3B. In addition, intermediate annealing was performed in a non-oxidizing atmosphere at annealing temperatures shown in Table 3B for 30 seconds. Next, the second round of cold rolling (skin pass rolling) was performed at rolling reductions shown in Table 3B.

[0258] In order to investigate the textures after the skin pass rolling, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSD observation (step intervals: 100 nm) was performed on the processed surface in the above-described manner. S.sub.tyl/S.sub.tra, S.sub.100/S.sub.tot, S.sub.100/S.sub.tra, and K.sub.100/K.sub.tyl were obtained from the area and average KAM value of each kind of the orientated grains obtained by EBSD observation.

[0259] In addition, on the steel sheets after the skin pass rolling, a first heat treatment was performed under conditions shown in Table 3B. After the first heat treatment, in order to investigate the textures, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSD observation was performed on the processed surface. The areas, average KAM values, and average grain sizes of kinds shown in Table 4 were obtained by EBSD observation.

[0260] In addition, as a second heat treatment, annealing was performed on the steel sheets at a temperature of 800? C. for 2 hours. From each of the steel sheets after the second heat treatment, 55 mm?55 mm sample pieces were collected as measurement samples. The samples were collected using a shearing machine. In addition, as the magnetic characteristics, the iron losses W10/400 (average value of the rolling direction and the width direction), W15/50 (C), and W15/50 (L) were measured in the same manner as in First Example, and W15/50 (C)/W15/50 (L) were obtained. The measurement results are shown in Table 4.

TABLE-US-00004 TABLE 3A Chemical composition (mass %, remainder is Fe and impurities) Left side of For- mula No. C Si sol. Al S N Mn Ni Co Pt Pb Cu Au Cr Mg B O (1) 201 0.0010 3.20 0.61 0.0017 0.0018 0.21 0.003 ?3.60 202 0.0011 3.20 0.60 0.0020 0.0023 0.20 0.003 ?3.60 203 0.0010 3.19 0.60 0.0019 0.0018 0.20 0.003 ?3.59 204 0.0011 3.20 0.59 0.0022 0.0023 0.19 0.003 ?3.60 205 0.0010 3.19 0.59 0.0021 0.0020 0.21 0.003 ?3.58 206 0.0009 3.21 0.60 0.0019 0.0019 0.20 0.003 ?3.61 207 0.0009 3.19 0.61 0.0022 0.0023 0.21 0.003 ?3.59 208 0.0009 2.00 0.31 0.0020 0.0018 2.39 0.003 0.09 209 0.0011 3.21 0.60 0.0020 0.0021 0.21 0.003 ?3.60 210 0.0011 3.20 0.59 0.0021 0.0024 0.20 0.003 ?3.60 211 0.0009 3.21 0.60 0.0018 0.0020 0.21 0.003 ?3.60 212 0.0010 3.19 0.61 0.0019 0.0017 0.19 0.003 ?3.60 213 0.0010 3.20 0.60 0.0020 0.0019 0.20 0.003 ?3.60 214 0.0011 3.21 0.59 0.0018 0.0021 0.19 0.003 ?3.61 215 0.0009 3.20 0.61 0.0018 0.0018 0.20 0.003 ?3.60 216 0.0011 3.21 0.60 0.0018 0.0017 0.20 0.003 ?3.60 217 0.0008 3.19 0.60 0.0017 0.0018 0.21 0.003 ?3.59 218 0.0010 3.20 0.61 0.0016 0.0019 0.21 0.002 ?3.60 220 0.0085 3.21 0.60 0.0017 0.0020 0.22 0.003 ?3.60 221 0.0009 1.59 0.60 0.0017 0.0022 0.22 0.002 ?1.98 222 0.0008 3.91 0.60 0.0019 0.0021 0.22 0.004 ?4.29 223 0.0010 3.22 0.00 0.0019 0.0022 0.22 0.004 ?3.00 224 0.0008 3.23 2.80 0.0017 0.0019 0.22 0.002 ?5.81 225 0.0010 3.22 0.61 0.0004 0.0020 0.22 0.002 ?3.61 226 0.0010 3.23 0.60 0.0091 0.0020 0.22 0.003 ?3.61 227 0.0010 3.21 0.61 0.0019 0.0093 0.22 0.003 ?3.61 228 0.0009 3.22 0.61 0.0020 0.0020 0.22 0.002 0.0005 ?3.61 229 0.0011 3.23 0.61 0.0349 0.0020 0.22 0.002 0.0093 ?3.62 230 0.0009 3.22 0.61 0.0020 0.0021 0.22 0.001 ?3.61 231 0.0009 3.22 0.61 0.0019 0.0020 0.22 0.093 ?3.61 232 0.0011 3.22 0.61 0.0019 0.0018 0.22 0.003 ?3.61 233 0.0008 3.23 2.80 0.0018 0.0020 2.40 0.003 ?3.63 234 0.0011 3.21 0.59 0.0020 0.0017 0.21 0.004 0.0002 ?3.59 235 0.0010 3.20 0.58 0.0020 0.0017 0.21 0.003 0.0045 ?3.57 236 0.0008 3.20 0.58 0.0019 0.0017 0.21 0.002 0.0013 ?3.58 237 0.0008 3.19 0.60 0.0018 0.0020 0.21 0.003 0.0170 ?3.58 238 0.0120 3.23 3.23 0.0020 0.0021 0.21 0.003 ?3.61 239 0.0009 1.40 0.60 0.0018 0.0021 0.21 0.003 ?1.79 240 0.0009 4.19 0.60 0.0017 0.0020 0.21 0.003 ?4.58 241 0.0010 3.22 4.20 0.0018 0.0019 0.21 0.002 ?7.21 242 0.0008 3.22 0.60 0.0451 0.0018 0.21 0.003 ?3.61 243 0.0009 3.23 0.59 0.0019 0.0120 0.21 0.004 ?3.61 244 0.0007 3.23 0.61 0.0019 0.0019 0.21 0.000 ?3.63 245 0.0010 3.22 0.61 0.0018 0.0018 0.21 0.120 ?3.62 246 0.0008 3.22 0.60 0.0019 0.0020 2.60 0.004 ?1.22 247 0.0011 3.21 0.61 0.0017 0.0018 0.21 0.003 ?3.61 248 0.0010 3.21 0.60 0.0015 0.0017 0.21 0.003 ?3.60 249 0.0012 3.20 0.60 0.0016 0.0018 0.21 0.002 ?3.59 250 0.0011 3.20 0.61 0.0017 0.0016 0.21 0.003 ?3.61

TABLE-US-00005 TABLE 3B Hot-rolled After hot sheet Intermediate colling annealing Rolling annealing EBSD observation result First heat treatment Sheet Annealing reduction (%) Annealing after skin pass rolling Annealing Annealing thickness temperature Cold Skin pass temperature S / S.sub.100/ S.sub.100/ K.sub.100/ temperature time No. (mm) (? C.) rolling rolling (? C.) S S S K (? C.) (s) Note 201 2.50 1050 92 10 800 0.73 0.15 0.73 0.983 800 30 Invention Example 202 2.50 1050 92 10 800 0.74 0.15 0.73 0.974 800 30 Invention Example 203 2.50 1050 92 10 800 0.74 0.15 0.72 0.984 800 30 Invention Example 204 2.50 1050 92 10 800 0.72 0.15 0.72 0.983 800 30 Invention Example 205 2.50 1050 92 10 800 0.74 0.15 0.72 0.977 800 30 Invention Example 206 2.50 1050 92 10 800 0.72 0.15 0.71 0.976 800 30 Invention Example 207 2.50 1050 92 10 800 0.72 0.14 0.72 0.981 800 30 Invention Example 208 2.50 1050 92 10 800 0.89 0.03 0.72 0.981 800 30 Comparative Example 209 2.50 850 92 10 800 0.88 0.15 0.71 0.977 800 30 Comparative Example 210 1.33 850 85 10 800 0.72 0.01 0.71 0.974 800 30 Comparative Example 211 0.50 1050 60 10 800 0.73 0.15 0.24 0.978 800 30 Comparative Example 212 2.50 1050 92 3 800 0.73 0.14 0.72 1.002 800 30 Comparative Example 213 2.50 1050 92 10 800 0.72 0.14 0.72 0.978 690 1 Comparative Example 214 2.50 1050 92 10 950 0.73 0.01 0.72 0.978 800 30 Comparative Example 215 2.50 1050 92 15 800 0.71 0.14 0.72 0.981 800 30 Invention Example 216 2.50 1050 92 25 800 0.73 0.16 0.72 0.977 800 30 Invention Example 217 2.50 1050 92 10 800 0.72 0.14 0.73 0.980 750 30 Invention Example 218 2.50 1050 92 10 800 0.72 0.15 0.73 0.979 950 30 Invention Example 220 2.50 1050 92 10 800 0.73 0.14 0.73 0.980 800 30 Invention Example 221 2.50 1050 92 10 800 0.72 0.16 0.73 0.982 800 30 Invention Example 222 2.50 1050 92 10 800 0.72 0.15 0.72 0.982 800 30 Invention Example 223 2.50 1050 92 10 800 0.72 0.15 0.72 0.980 800 30 Invention Example 224 2.50 1050 92 10 800 0.72 0.15 0.72 0.977 800 30 Invention Example 225 2.50 1050 92 10 800 0.72 0.15 0.71 0.982 800 30 Invention Example 226 2.50 1050 92 10 800 0.72 0.15 0.73 0.980 800 30 Invention Example 227 2.50 1050 92 10 800 0.73 0.14 0.73 0.982 800 30 Invention Example 228 2.50 1050 92 10 800 0.71 0.15 0.73 0.981 800 30 Invention Example 229 2.50 1050 92 10 800 0.73 0.16 0.71 0.981 800 30 Invention Example 230 2.50 1050 92 10 800 0.71 0.15 0.73 0.981 800 30 Invention Example 231 2.50 1050 92 10 800 0.72 0.15 0.73 0.978 800 30 Invention Example 232 2.50 1050 92 10 800 0.73 0.15 0.73 0.983 800 30 Invention Example 233 2.50 1050 92 10 800 0.72 0.15 0.73 0.982 800 30 In vention Example 234 2.50 1050 92 10 800 0.73 0.14 0.71 0.979 800 30 Invention Example 235 2.50 1050 92 10 800 0.71 0.15 0.73 0.977 800 30 Invention Example 236 2.50 1050 92 10 800 0.72 0.15 0.73 0.981 800 30 Invention Example 237 2.50 1050 92 10 800 0.72 0.14 0.73 0.980 800 30 Invention Example 238 2.50 1050 92 10 800 0.90 0.02 0.71 0.980 800 30 Comparative Example 239 2.50 1050 92 10 800 0.89 0.04 0.71 0.982 800 30 Comparative Example 240 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 241 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 242 2.50 1050 92 10 800 0.89 0.02 0.71 0.977 800 30 Comparative Example 243 2.50 1050 92 10 800 0.88 0.03 0.71 0.979 800 30 Comparative Example 244 2.50 1050 92 10 800 0.90 0.03 0.72 0.977 800 30 Comparative Example 245 2.50 1050 92 10 800 0.89 0.02 0.72 0.978 800 30 Comparative Example 246 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 247 2.50 1050 92 10 800 0.72 0.14 0.73 0.980 900 30 Invention Example 248 2.50 1050 92 10 800 0.72 0.15 0.71 0.979 720 30 Invention Example 249 1.80 1050 90 10 800 0.71 0.15 0.72 0.977 800 30 Invention Example 250 2.50 1050 92 10 800 0.73 0.14 0.73 0.981 800 5 Invention Example indicates data missing or illegible when filed

TABLE-US-00006 TABLE 4 EBSD observation result after first heat treatment S / S.sub.100/ S.sub.100/ K.sub.100/ d.sub.100/ No. K K K.sub.100 K.sub.110 S S S K d 201 0.208 0.204 0.200 0.201 0.64 0.28 0.85 0.962 1.30 202 0.208 0.205 0.201 0.201 0.65 0.29 0.84 0.968 1.30 203 0.208 0.204 0.201 0.202 0.65 0.28 0.85 0.966 1.29 204 0.208 0.203 0.201 0.203 0.65 0.28 0.86 0.966 1.31 205 0.208 0.205 0.201 0.202 0.65 0.28 0.86 0.965 1.30 206 0.207 0.205 0.201 0.202 0.64 0.28 0.85 0.969 1.30 207 0.207 0.204 0.200 0.202 0.66 0.29 0.85 0.966 1.30 208 0.207 0.205 0.201 0.203 0.88 0.04 0.85 0.969 1.28 209 0.208 0.204 0.201 0.201 0.84 0.29 0.84 0.968 1.28 210 0.209 0.205 0.201 0.202 0.66 0.02 0.85 0.964 1.30 211 0.208 0.204 0.201 0.201 0.65 0.28 0.24 0.963 1.30 212 0.196 0.203 0.202 0.203 0.65 0.28 0.86 1.028 1.31 213 0.209 0.204 0.200 0.203 0.64 0.28 0.85 0.959 0.78 214 0.208 0.204 0.200 0.202 0.65 0.29 0.85 0.965 1.31 215 0.207 0.204 0.201 0.202 0.65 0.28 0.84 0.970 1.30 216 0.209 0.204 0.200 0.201 0.65 0.27 0.86 0.957 1.31 217 0.211 0.205 0.202 0.200 0.65 0.29 0.85 0.958 1.29 218 0.208 0.206 0.198 0.199 0.64 0.29 0.85 0.955 1.29 220 0.210 0.202 0.200 0.204 0.65 0.28 0.86 0.951 1.30 221 0.210 0.204 0.199 0.202 0.65 0.28 0.85 0.948 1.30 222 0.207 0.204 0.198 0.203 0.65 0.29 0.84 0.956 1.29 223 0.209 0.207 0.198 0.204 0.64 0.28 0.85 0.948 1.30 224 0.209 0.206 0.203 0.200 0.64 0.29 0.85 0.972 1.29 225 0.211 0.207 0.202 0.200 0.65 0.28 0.84 0.957 1.30 226 0.207 0.203 0.201 0.199 0.64 0.28 0.85 0.968 1.29 227 0.207 0.207 0.199 0.200 0.64 0.29 0.85 0.961 1.29 228 0.208 0.201 0.200 0.199 0.65 0.28 0.84 0.964 1.30 229 0.206 0.203 0.199 0.200 0.65 0.28 0.84 0.965 1.30 230 0.206 0.201 0.199 0.201 0.65 0.29 0.85 0.965 1.29 231 0.206 0.204 0.199 0.204 0.65 0.29 0.85 0.967 1.30 232 0.206 0.207 0.201 0.202 0.65 0.28 0.85 0.975 1.29 233 0.209 0.207 0.199 0.198 0.65 0.28 0.84 0.955 1.29 234 0.207 0.201 0.202 0.203 0.64 0.29 0.85 0.978 1.30 235 0.210 0.202 0.198 0.202 0.64 0.28 0.85 0.946 1.30 236 0.208 0.205 0.203 0.202 0.65 0.28 0.85 0.975 1.29 237 0.206 0.204 0.198 0.201 0.65 0.27 0.86 0.963 1.29 238 0.206 0.208 0.199 0.204 0.87 0.04 0.86 0.965 1.27 239 0.205 0.206 0.200 0.204 0.88 0.04 0.85 0.973 1.29 240 Not evaluated since cracking occurs during cold rolling 241 Not evaluated since cracking occurs during cold rolling 242 0.208 0.205 0.198 0.205 0.87 0.04 0.86 0.953 1.28 243 0.206 0.206 0.199 0.200 0.88 0.05 0.85 0.967 1.29 244 0.206 0.206 0.200 0.205 0.87 0.03 0.84 0.972 1.29 245 0.208 0.207 0.200 0.203 0.88 0.04 0.85 0.964 1.29 246 Not evaluated since cracking occurs during cold rolling 247 0.210 0.198 0.202 0.201 0.64 0.28 0.84 0.962 1.30 248 0.205 0.204 0.201 0.203 0.65 0.28 0.84 6.980 1.31 249 0.206 6.201 0.201 0.200 0.50 0.20 0.84 0.977 1.30 250 0.207 0.204 0.199 0.197 0.66 0.29 0.84 0.962 1.30 EBSD observation result Second after first heat treatment heat treatment d.sub.100/ K.sub.100/ d.sub.100/ S.sub.100/ K.sub.100/ W10/400 W15/50(C)/ No. d K d S.sub.110 K.sub.110 (W/kg) W15/50(L) Note 201 1.49 0.982 1.09 6.79 0.994 10.5 1.11 Invention Example 202 1.50 0.984 1.11 6.81 1.001 10.6 1.12 In vention Example 203 1.51 0.983 1.10 6.79 0.995 10.5 1.08 Invention Example 204 1.51 0.988 1.11 6.81 0.990 10.5 1.12 Invention Example 205 1.51 0.982 1.09 6.80 0.998 10.6 1.07 In vention Example 206 1.51 0.980 1.09 6.82 0.992 10.5 1.11 Invention Example 207 1.51 0.981 1.10 6.79 0.990 10.4 1.12 Invention Example 208 1.48 0.983 1.10 1.51 0.992 15.5 1.41 Comparative Example 209 1.49 0.988 1.09 6.80 0.999 12.4 1.41 Comparative Example 210 1.51 0.984 1.09 6.81 1.000 12.3 1.42 Comparative Example 211 1.51 0.985 1.09 0.30 0.995 12.3 1.41 Comparative Example 212 1.49 0.995 1.11 6.79 0.996 12.2 1.38 Comparative Example 213 1.51 0.979 1.11 6.80 0.986 12.4 1.41 Comparative Example 214 0.90 0.983 1.10 6.82 0.994 12.4 1.38 Comparative Example 215 1.49 0.984 1.08 6.81 0.994 11.3 1.08 Invention Example 216 1.50 0.981 1.10 6.80 0.995 11.3 1.08 Invention Example 217 1.49 0.985 1.10 6.78 1.009 10.6 1.12 Invention Example 218 1.49 0.963 1.09 6.79 0.999 10.5 1.08 Invention Example 220 1.49 0.988 1.09 6.79 0.980 10.7 1.09 Invention Example 221 1.48 0.974 1.08 6.79 0.984 10.8 1.11 Invention Example 222 1.48 0.968 1.10 6.79 0.974 10.2 1.11 Invention Example 223 1.49 0.958 1.10 6.80 0.972 10.7 1.07 Invention Example 224 1.48 0.986 1.09 6.80 1.013 10.3 1.09 Invention Example 225 1.49 0.978 1.10 6.79 1.008 10.1 1.10 Invention Example 226 1.48 0.990 1.10 6.79 1.006 10.8 1.10 Invention Example 227 1.49 0.962 1.10 6.79 0.995 10.9 1.07 Invention Example 228 1.49 0.994 1.10 6.79 1.005 10.5 1.08 Invention Example 229 1.48 0.981 1.10 6.78 0.994 10.6 1.12 Invention Example 230 1.49 0.986 1.09 6.79 0.990 10.5 1.10 Invention Example 231 1.49 0.976 1.09 6.79 0.976 10.1 1.07 Invention Example 232 1.50 0.972 1.09 6.78 0.994 10.5 1.12 Invention Example 233 1.48 0.964 1.09 6.79 1.005 9.9 1.11 Invention Example 234 1.49 1.006 1.09 6.79 0.999 10.1 1.11 Invention Example 235 1.49 0.981 1.09 6.80 0.983 10.6 1.07 Invention Example 236 1.49 0.990 1.09 6.79 1.006 10.3 1.12 Invention Example 237 1.50 0.973 1.10 6.80 0.983 10.6 1.12 Invention Example 238 1.48 0.959 1.10 1.52 0.974 15.5 1.42 Comparative Example 239 1.49 0.967 1.11 1.51 0.977 15.6 1.41 Comparative Example 240 Not evaluated since cracking occurs during cold rolling Comparative Example 241 Not evaluated since cracking occurs during cold rolling Comparative Example 242 1.48 0.967 1.10 1.51 0.968 15.6 1.38 Comparative Example 243 1.48 0.964 1.11 1.51 0.992 15.6 1.39 Comparative Example 244 1.47 0.970 1.10 1.50 0.977 15.5 1.42 Comparative Example 245 1.49 0.969 1.11 1.52 0.987 15.6 1.37 Comparative Example 246 Not evaluated since cracking occurs during cold rolling Comparative Example 247 1.50 1.017 1.10 6.81 1.002 10.4 1.20 Invention Example 248 1.49 0.988 0.99 6.80 0.993 10.4 1.23 Invention Example 249 1.50 0.999 1.09 0.98 1.006 10.5 1.22 Invention Example 250 1.49 0.973 1.10 6.79 1.008 10.4 1.23 Invention Example indicates data missing or illegible when filed

[0261] Underlined values in Table 3A, Table 3B, and Table 4 indicate conditions deviating from the scope of the present invention. In all of No. 201 to No. 207, No. 215 to No. 237, and No. 247 to No. 250, which are invention examples, the iron losses W10/400 were favorable values.

[0262] On the other hand, in No. 208, which is a comparative example, the Mn concentration was high, and the value of the left side of Formula (1) was more than 0.00 (a composition that underwent ?-? transformation), which made the area ratio S.sub.tyl/S.sub.tot and the area ratio S.sub.100/S.sub.tot each deviate from the range of Formula (10) or Formula (11). As a result, the iron loss W10/400 was high. In No. 209 to No. 214, which are comparative examples, since at least any of the temperature in the hot-rolled sheet annealing, the temperature in the intermediate annealing, the rolling reduction in the cold rolling, the rolling reduction in the skin pass rolling, and the temperature in the first heat treatment was not optimal, any of Formula (10) to Formula (15) was not satisfied, and, as a result, the iron losses W10/400 were high.

[0263] In addition, in No. 238 to No. 246, which are comparative examples, since the chemical compositions were outside the scope of the present invention, Formula (10) and Formula (11) were not satisfied, and the iron losses W10/400 became high or cracking occurred during the cold rolling.

Third Example

[0264] Molten steel was cast, thereby producing ingots having chemical compositions shown in Table 5A. Here, the column Left side of Formula (1) indicates the values of the left side of Formula (1) described above. After that, the produced ingots were hot-rolled by being heated up to 1150? C. and rolled such that the sheet thicknesses became as shown in Table 5B. In addition, after the end of finish rolling, the hot-rolled steel sheets were cooled with water and coiled. The temperatures (finish temperatures) in a stage of the final pass of the finish rolling at this time were 830? C., and the coiling temperatures were within a range of 500? C. to 700? C.

[0265] Next, hot-rolled sheet annealing was performed on the hot-rolled steel sheets under conditions shown in Table 5B for 30 seconds, scales were removed by pickling, and cold rolling was performed at rolling reductions shown in Table 5B. In addition, intermediate annealing was performed in a non-oxidizing atmosphere at 800? C. for 30 seconds. Next, the second round of cold rolling (skin pass rolling) was performed at rolling reductions shown in Table 5B.

[0266] In order to investigate the textures after the skin pass rolling, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSD observation (step intervals: 100 nm) was performed on the processed surface in the above-described manner S.sub.tyl/S.sub.tot, S.sub.100/S.sub.tot, S.sub.100/S.sub.tra, and K.sub.100/K.sub.tyl were obtained from the area and average KAM value of each kind of the orientated grains obtained by EBSD observation.

[0267] In addition, on the steel sheets after the skin pass rolling, a second heat treatment was performed under conditions shown in Table 5B without a first heat treatment. After the second heat treatment, in order to investigate the textures, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSD observation was performed on the processed surface. The areas and average grain sizes of kinds shown in Table 6 were obtained by EBSD observation.

[0268] In addition, after the second heat treatment, from each of the steel sheets after the second heat treatment, 55 mm?55 mm sample pieces were collected as measurement samples. The samples were collected using a shearing machine. In addition, as the magnetic characteristics, the iron losses W10/400 (average value of the rolling direction and the width direction), W15/50 (C), and W15/50 (L) were measured in the same manner as in First Example, and W15/50 (C)/W15/50 (L) were obtained. The measurement results are shown in Table 6.

TABLE-US-00007 TABLE 5A Chemical composition (mass %, remainder is Fe and impurities) Left side of For- mula No. C Si sol. Al S N Mn Ni Co Pt Pb Cu Au Cr Mg B O (1) 301 0.0010 3.21 0.59 0.0020 0.0020 0.20 0.003 ?3.60 302 0.0010 3.20 0.61 0.0022 0.0021 0.20 0.003 ?3.61 303 0.0009 3.20 0.60 0.0020 0.0020 0.20 0.003 ?3.60 304 0.0009 3.20 0.60 0.0021 0.0021 0.21 0.004 ?3.60 305 0.0010 3.21 0.61 0.0021 0.0023 0.21 0.004 ?3.61 306 0.0009 3.20 0.59 0.0019 0.0020 0.20 0.004 ?3.60 307 0.0011 3.21 0.60 0.0022 0.0022 0.20 0.003 ?3.61 308 0.0010 3.20 0.60 0.0021 0.0023 0.21 0.004 ?3.59 309 0.0009 2.00 0.31 0.0018 0.0019 2.41 0.003 0.10 310 0.0009 3.19 0.60 0.0017 0.0017 0.19 0.003 ?3.60 311 0.0011 3.21 0.59 0.0019 0.0022 0.20 0.003 ?3.60 312 0.0009 3.20 0.59 0.0020 0.0021 0.20 0.002 ?3.60 313 0.0010 3.20 0.59 0.0018 0.0017 0.19 0.003 ?3.60 314 0.0010 3.21 0.59 0.0020 0.0020 0.19 0.002 ?3.61 315 0.0012 3.20 0.60 0.0018 0.0018 0.20 0.003 ?3.60 316 0.0083 3.22 0.61 0.0017 0.0020 0.21 0.003 ?3.61 317 0.0010 1.60 0.60 0.0018 0.0020 0.21 0.002 ?1.99 318 0.0010 3.91 0.61 0.0018 0.0019 0.22 0.003 ?4.29 319 0.0010 3.22 0.01 0.0017 0.0021 0.22 0.002 ?3.01 320 0.0008 3.21 2.80 0.0019 0.0019 0.22 0.002 ?5.80 321 0.0009 3.22 0.60 0.0006 0.0021 0.21 0.004 ?3.61 322 0.0008 3.23 0.60 0.0092 0.0019 0.22 0.003 ?3.61 323 0.0008 3.21 0.60 0.0020 0.0093 0.21 0.002 ?3.61 324 0.0008 3.22 0.60 0.0017 0.0021 0.23 0.004 0.0005 ?3.59 325 0.0008 3.23 0.61 0.0351 0.0019 0.22 0.004 0.0091 ?3.62 326 0.0009 3.22 0.61 0.0018 0.0019 0.21 0.001 ?3.63 327 0.0008 3.22 0.60 0.0020 0.0018 0.22 0.093 ?3.60 328 0.0011 3.23 0.60 0.0017 0.0018 0.21 0.004 ?3.62 329 0.0008 3.21 2.80 0.0018 0.0022 2.40 0.003 ?3.62 330 0.0010 3.21 0.59 0.0019 0.0019 0.20 0.003 0.0002 ?3.60 331 0.0011 3.20 0.59 0.0020 0.0018 0.22 0.004 0.0044 ?3.58 332 00011 3.21 0.59 0.0020 0.0020 0.22 0.004 0.0016 ?3.58 333 0.0008 3.19 0.59 0.0018 0.0017 0.22 0.003 0.0169 ?3.57 334 0.0120 3.22 0.60 0.0019 0.0018 0.21 0.002 ?3.61 335 0.0010 1.40 0.60 0.0020 0.0019 0.22 0.003 ?1.78 336 0.0008 4.21 0.60 0.0018 0.0018 0.20 0.002 ?4.61 338 0.0010 3.22 4.19 0.0018 0.0019 0.20 0.004 ?7.20 339 0.0008 3.22 0.61 0.0451 0.0020 0.21 0.004 ?3.62 340 0.0011 3.22 0.61 0.0020 0.0121 0.20 0.004 ?3.63 341 0.0008 3.23 0.61 0.0017 0.0022 0.21 0.000 ?3.63 342 0.0010 3.22 0.59 0.0019 0.0021 0.21 0.121 ?3.60 343 0.0008 3.21 0.60 0.0018 0.0021 2.60 0.003 ?1.21 344 0.0011 3.21 0.58 0.0020 0.0018 0.20 0.003 ?3.60

TABLE-US-00008 TABLE 5B After hot Hot-rolled sheet Second heat rolling annealing Rolling EBSD observation result treatment Sheet Annealing reduction (%) after skin pass rolling Annealing Annealing thickness temperature Cold Skin pass S / S.sub.100/ S.sub.100/ K.sub.100/ temperature time (mm) (? C.) rolling rolling S S S K (? C.) (s) Note 301 2.50 1050 92 10 0.72 0.15 0.72 0.977 1050 30 Invention Example 302 2.50 1050 92 10 0.72 0.16 0.72 0.981 800 7200 Invention Example 303 2.50 1050 92 10 0.73 0.15 0.73 0.975 1050 30 Invention Example 304 2.50 1050 92 10 0.74 0.16 0.72 0.982 1050 30 Invention Example 305 2.50 1050 92 10 0.73 0.15 0.72 0.986 1050 30 Invention Example 306 2.50 1050 92 10 0.74 0.16 0.72 0.980 1050 30 Invention Example 307 2.50 1050 92 10 0.73 0.16 0.70 0.978 1050 30 Invention Example 308 2.50 1050 92 10 0.72 0.15 0.73 0.979 1050 30 Invention Example 309 2.50 1050 92 10 0.90 0.03 0.72 0.977 1050 30 Comparative. Example 310 2.50 850 92 10 0.88 0.15 0.71 0.977 1050 30 Comparative. Example 311 1.33 850 85 10 0.72 0.02 0.71 0.977 1050 30 Comparative Example 312 0.50 1050 60 10 0.73 0.15 0.24 0.981 1050 30 Comparative. Example 313 1.33 850 85 15 0.73 0.01 0.71 0.978 1050 30 Comparative. Example 314 1.33 850 85 20 0.73 0.02 0.72 0.979 1050 30 Comparative Example 315 1.33 850 85 25 0.72 0.01 0.72 0.978 1050 30 Comparative Example 316 2.50 1050 92 10 0.73 0.16 0.73 0.977 1050 30 Invention Example 317 2.50 1050 92 10 0.72 0.15 0.72 0.978 1050 30 Invention Example 318 2.50 1050 92 10 0.71 0.14 0.72 0.980 1050 30 Invention Example 319 2.50 1050 92 10 0.73 0.16 0.73 0.979 1050 30 Invention Example 320 2.50 1050 92 10 0.73 0.14 0.72 0.978 1050 30 Invention Example 321 2.50 1050 92 10 0.73 0.15 0.72 0.980 1050 30 Invention Example 322 2.50 1050 92 10 0.73 0.14 0.73 0.978 1050 30 Invention Example 323 2.50 1050 92 10 0.71 0.14 0.71 0.982 1050 30 Invention Example 324 2.50 1050 92 10 0.73 0.14 0.72 0.980 1050 30 Invention Example 325 2.50 1050 92 10 0.72 0.14 0.72 0.981 1050 30 Invention Example 326 2.50 1050 92 10 0.73 0.14 0.72 0.981 1050 30 Invention Example 327 2.50 1050 92 10 0.72 0.15 0.71 0.980 1050 30 Invention Example 328 2.50 1050 92 10 0.71 0.15 0.71 0.979 1050 30 Invention Example 329 2.50 1050 92 10 0.72 0.14 0.73 0.980 1050 30 Invention Example 330 2.50 1050 92 10 0.72 0.15 0.72 0.978 1050 30 Invention Example 331 2.50 1050 92 10 0.71 0.15 0.73 0.980 1050 30 Invention Example 332 2.50 1050 92 10 0.73 0.15 0.72 0.981 1050 30 Invention Example 333 2.50 1050 92 10 0.73 0.16 0.71 0.982 1050 30 Invention Example 334 2.50 1050 92 10 0.89 0.03 0.72 0.977 1050 30 Comparative Example 335 2.50 1050 92 10 0.88 0.02 0.71 0.977 1050 30 Comparative Example 336 2.50 1050 92 Cracking occurs during cold rolling Comparative. Example 338 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 339 2.50 1050 92 10 0.90 0.03 0.72 0.982 1050 30 Comparative Example 340- 2.50 1050 92 10 0.88 0.02 0.71 0.981 1050 30 Comparative Example 341 2.50 1050 92 10 0.88 0.03 0.72 0.977 1050 30 Comparative Example 342 2.50 1050 92 10 0.89 0.04 0.72 0.982 1050 30 Comparative Example 343 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 344 2.50 1050 92 10 0.71 0.14 0.73 0.977 9.70 30 Invention. Example indicates data missing or illegible when filed

TABLE-US-00009 TABLE 6 EBSD observation result Second after second heat treatment heat treatment S / S.sub.100/ S.sub.100/ d.sub.100/ d.sub.100/ d.sub.100/ W10/400 W15/50(C)/ No. S S S d d d (W/kg) W15/50(L) Note 301 0.46 0.34 0.77 1.02 1.04 0.98 10.6 1.09 Invention Example 302 0.44 0.35 0.76 1.02 1.05 0.98 10.5 1.12 Invention Example 303 0.44 0.35 0.73 1.02 1.05 0.98 10.4 1.09 Invention Example 304 0.43 0.36 0.74 1.02 1.04 0.98 10.6 1.13 Invention Example 305 0.45 0.37 0.76 1.03 1.04 0.98 10.5 1.11 Invention Example 306 0.45 0.37 0.75 1.03 1.04 0.98 10.6 1.08 Invention Example 307 0.43 0.36 0.77 1.03 1.04 0.99 10.5 1.10 Invention Example 308 0.47 0.36 0.75 1.01 1.04 0.98 10.5 1.13 Invention Example 309 0.85 0.02 0.76 1.02 1.03 0.98 15.5 1.39 Comparative Example 310 0.81 0.33 0.74 1.01 1.04 0.99 12.3 1.42 Comparative Example 311 0.46 0.04 0.74 1.02 1.05 0.99 12.2 1.43 Comparative Example 312 0.46 0.15 0.25 1.03 1.05 0.99 12.3 1.39 Comparative Example 313 0.77 0.13 0.75 0.94 1.03 0.98 12.3 1.40 Comparative Example 314 0.76 0.13 0.73 1.03 0.93 0.98 12.2 1.40 Comparative Example 315 0.76 0.13 0.76 1.01 1.05 0.93 12.2 1.41 Comparative Example 316 0.47 0.36 0.78 1.01 1.04 0.98 10.8 1.08 Invention Example 317 0.45 0.34 0.78 1.00 1.04 0.98 10.8 1.08 Invention Example 318 0.46 0.33 0.75 1.03 1.02 0.98 10.2 1.11 Invention Example 319 0.45 0.34 0.79 1.03 1.05 0.98 10.8 1.13 Invention Example 320 0.48 0.36 0.76 1.02 1.03 0.98 10.2 1.08 Invention Example 321 0.44 0.35 0.76 1.03 1.02 0.99 10.2 1.08 Invention Example 322 0.46 0.35 0.78 1.04 1.06 0.99 10.8 1.10 Invention Example 323 0.47 0.33 0.76 1.02 1.02 0.99 10.8 1.10 Invention Example 324 0.44 0.36 0.79 1.03 1.05 0.98 10.5 1.09 Invention Example 325 0.49 0.36 0.78 1.00 1.03 0.98 10.5 1.09 Invention Example 326 0.47 0.35 0.76 1.03 1.05 0.98 10.6 1.08 Invention Example 327 0.45 0.35 0.77 1.03 1.04 0.98 10.2 1.10 Invention Example 328 0.46 0.33 0.78 1.02 1.02 0.98 10.5 1.09 Invention. Example 329 0.47 0.33 0.77 1.03 1.02 0.99 9.9 1.12 Invention Example 330 0.47 0.36 0.76 1.00 1.03 0.98 10.2 1.10 Invention Example 331 0.44 0.33 0.78 1.02 1.03 0.99 10.5 1.12 Invention Example 332 0.44 0.36 0.77 1.00 1.06 0.98 10.2 1.10 Invention Example 333 0.48 0.34 0.78 1.01 1.04 0.98 10.5 1.09 Invention Example 334 0.86 0.01 0.75 1.03 1.03 0.99 15.5 1.38 Comparative Example 335 0.86 0.01 0.76 1.01 1.02 0.99 15.5 1.38 Comparative Example 336 Not evaluated since cracking occurs during cold rolling Comparative Example 338 Not evaluated since cracking occurs during cold rolling Comparative Example 339 0.85 0.03 0.75 1.03 1.05 0.98 15.5 1.40 Comparative Example 340 0.84 0.00 0.75 1.00 1.03 0.99 15.5 1.41 Comparative Example 341 0.85 0.00 0.76 1.02 1.05 0.98 15.5 1.40 Comparative Example 342 0.85 0.02 0.75 1.03 1.05 0.99 15.5 1.41 Comparative Example 343 Not evaluated since cracking occurs during cold colling Comparative Example 344 0.45 0.35 0.79 1.00 1.03 0.93 10.6 1.12 Invention Example indicates data missing or illegible when filed

[0269] Underlined values in Table 5A, Table 5B, and Table 6 indicate conditions deviating from the scope of the present invention. In all of No. 301 to No. 308, No. 316 to No. 333, and No. 344, which are invention examples, the iron losses W10/400 were favorable values.

[0270] On the other hand, in No. 309, which is a comparative example, the Mn concentration was high, and the value of the left side of Formula (1) was more than 0.00 (a composition that underwent ?-? transformation), which made S.sub.tyl/S.sub.tot and S.sub.100/S.sub.tot each deviate from the range of Formula (20) or Formula (21). As a result, the iron loss W10/400 was high.

[0271] In No. 310 to No. 315, which are comparative examples, since the temperature in the hot-rolled sheet annealing and/or the rolling reduction in the cold rolling were not optimal, at least one of Formula (20) to Formula (24) was not satisfied, and, as a result, the iron losses W10/400 were high.

[0272] In addition, in No. 334 to No. 343, which are comparative examples, since the chemical compositions were outside the scope of the present invention, Formula (20) and Formula (21) were not satisfied, and the iron losses W10/400 became high or cracking occurred during the cold rolling.

Fourth Example

[0273] Molten steel was cast, thereby producing ingots having chemical compositions shown in Table 7A. Here, the column Left side of Formula (1) indicates the values of the left side of Formula (1) described above. After that, the produced ingots were hot-rolled by being heated up to 1150? C. and rolled such that the sheet thicknesses became as shown in Table 7B. In addition, after the end of finish rolling, the hot-rolled steel sheets were cooled with water and coiled. The temperatures (finish temperatures) in a stage of the final pass of the finish rolling at this time were 830? C., and the coiling temperatures were within a range of 500? C. to 700? C.

[0274] Next, hot-rolled sheet annealing was performed on the hot-rolled steel sheets under conditions shown in Table 7B for 30 seconds, scales were removed by pickling, and cold rolling was performed at rolling reductions shown in Table 7B. In addition, intermediate annealing was performed in a non-oxidizing atmosphere at 800? C. for 30 seconds. Next, the second round of cold rolling (skin pass rolling) was performed at rolling reductions shown in Table 7B.

[0275] Next, a first heat treatment was performed under conditions of 800? C. and 30 seconds.

[0276] After the first heat treatment, in order to investigate the texture, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSD observation (step intervals: 100 nm) was performed on the processed surface. The areas, average KAM values, and average grain sizes of the orientated grains were obtained by EBSD observation, and S.sub.tyl/S.sub.tot, S.sub.100/S.sub.tot, S.sub.100/S.sub.tra, K.sub.100/K.sub.tyl, d.sub.100/d.sub.ave, and d.sub.100/d.sub.tyl were obtained.

[0277] In addition, on the steel sheets after the first heat treatment, a second heat treatment was performed under conditions shown in Table 7B. After the second heat treatment, in order to investigate the textures, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSID observation was performed on the processed surface. The areas and average grain sizes of kinds shown in Table 8 were obtained by EBSD observation.

[0278] In addition, after the second heat treatment, from each of the steel sheets after the second heat treatment, 55 mm?55 mm sample pieces were collected as measurement samples. The samples were collected using a shearing machine. In addition, as the magnetic characteristics, the iron losses W10/400 (average value of the rolling direction and the width direction), W15/50 (C), and W15/50 (L) were measured in the same manner as in First Example, and W15/50 (C)/W15/50 (L) were obtained. The measurement results are shown in Table 8.

TABLE-US-00010 TABLE 7A Chemical composition (mass %, remainder is Fe and impurities) Left side of For- mula No. C Si sol. Al S N Mn Ni Co Pt Pb Cu Au Cr Mg B O (1) 401 0.0009 3.19 0.59 0.0019 0.0019 0.19 0.003 ?3.59 402 0.0011 3.20 0.60 0.0023 0.0021 0.19 0.004 ?3.61 403 0.0010 3.20 0.61 0.0021 0.0022 0.20 0.003 ?3.60 404 0.0010 3.21 0.61 0.0021 0.0021 0.21 0.004 ?3.61 405 0.0009 3.21 0.61 0.0020 0.0023 0.19 0.003 ?3.62 406 0.0008 3.20 0.60 0.0018 0.0017 0.21 0.004 ?3.60 407 0.0011 3.20 0.60 0.0020 0.0021 0.20 0.002 ?3.60 408 0.0010 3.20 0.61 0.0022 0.0020 0.19 0.003 ?3.62 409 0.0009 2.00 0.32 0.0020 0.0018 2.40 0.002 0.08 410 0.0010 3.20 0.61 0.0018 0.0019 0.20 0.002 ?3.61 411 0.0010 3.19 0.60 0.0022 0.0019 0.19 0.003 ?3.60 412 0.0010 3.19 0.59 0.0019 0.0019 0.19 0.003 ?3.59 413 0.0010 3.20 0.60 0.0018 0.0020 0.19 0.004 ?3.60 414 0.0010 3.19 0.60 0.0020 0.0022 0.20 0.004 ?3.60 415 0.0011 3.20 0.60 0.0017 0.0016 0.20 0.003 ?3.59 416 0.0009 3.19 0.59 0.0019 0.0019 0.19 0.004 ?3.59 417 0.0009 3.19 0.59 0.0019 0.0019 0.19 0.003 ?3.59 418 0.0009 3.19 0.59 0.0019 0.0019 0.19 0.002 ?3.59 419 0.0009 3.19 0.59 0.0019 0.0019 0.19 0.002 ?3.59 420 0.0010 3.20 0.60 0.0018 0.0020 0.19 0.002 ?3.60 421 0.0085 3.23 0.61 0.0021 0.0020 0.23 0.004 ?3.59 422 0.0009 1.59 0.59 0.0021 0.0021 0.22 0.003 ?3.39 423 0.0008 3.90 0.60 0.0018 0.0018 0.22 0.003 ?3.59 424 0.0009 3.22 0.00 0.0020 0.0020 0.21 0.003 ?3.59 425 0.0011 3.23 2.81 0.0019 0.0021 0.22 0.003 ?3.59 426 0.0008 3.22 0.60 0.0005 0.0021 0.21 0.004 ?3.59 427 0.0009 3.22 0.61 0.0093 0.0021 0.21 0.002 ?3.59 428 0.0009 3.23 0.61 0.0017 0.0093 0.21 0.004 ?3.59 429 0.0008 3.23 0.60 0.0018 0.0019 0.21 0.002 0.0005 ?3.59 430 0.0008 3.22 0.60 0.0348 0.0018 0.21 0.003 0.0094 ?3.59 431 0.0009 3.23 0.61 0.0018 0.0020 0.21 0.001 ?3.59 432 0.0007 3.22 0.59 0.0019 0.0018 0.23 0.094 ?3.59 433 0.0011 3.23 0.61 0.0020 0.0022 0.21 0.003 ?3.59 434 0.0011 3.22 2.79 0.0018 0.0021 2.40 0.002 ?3.59 435 0.0009 3.20 0.60 0.0019 0.0017 0.21 0.002 0.0002 ?3.59 436 0.0011 3.20 0.59 0.0017 0.0018 0.20 0.003 0.0043 ?3.59 437 0.0010 3.20 0.59 0.0020 0.0019 0.20 0.002 0.0013 ?3.59 438 0.0008 3.19 0.60 0.0018 0.0017 0.22 0.003 0.0169 ?3.59 439 0.0122 3.22 0.61 0.0019 0.0020 0.21 0.002 ?3.59 440 0.0010 1.40 0.60 0.0019 0.0021 0.22 0.004 ?3.59 441 0.0010 4.20 0.60 0.0020 0.0019 0.21 0.002 ?3.59 442 0.0008 3.21 4.19 0.0017 0.0021 0.20 0.004 ?3.59 443 0.0009 3.21 0.60 0.0450 0.0020 0.22 0.003 ?3.59 444 0.0011 3.23 0.60 0.0017 0.0119 0.21 0.003 ?3.59 445 0.0010 3.22 0.60 0.0017 0.0022 0.21 0.000 ?3.59 446 0.0011 3.23 0.60 0.0020 0.0020 0.22 0.120 ?3.59 447 0.0011 3.23 0.60 0.0020 0.0019 2.59 0.003 ?3.59 448 0.0010 3.20 0.58 0.0018 0.0021 0.20 0.003 ?3.59

TABLE-US-00011 TABLE 7B Hot-rolled After hot sheet Second heat rolling annealing Rolling EBSD observation result treatment Sheet Annealing reduction (%) after first heat treatment Annealing Annealing thickness temperature Cold Skin pass S / S.sub.100/ S.sub.100/ K.sub.100/ d.sub.100/ d.sub.100/ temperature time No. (mm) (? C.) rolling rolling S S S K d d (? C.) (s) Note 401 2.50 1050 92 10 0.65 0.28 0.85 0.959 1.30 1.49 1050 30 Invention Example 402 2.50 1050 92 10 0.65 0.27 0.85 0.959 1.30 1.49 800 7200 Invention Example 403 2.50 1050 92 10 0.64 0.28 0.84 0.969 1.29 1.49 1050 30 Invention Example 404 2.50 1050 92 10 0.64 0.28 0.85 0.964 1.29 1.51 1050 30 Invention Example 405 2.50 1050 92 10 0.65 0.28 0.86 0.966 1.31 1.50 1050 30 Invention Example 406 2.50 1050 92 10 0.65 0.28 0.86 0.964 1.30 1.52 1050 30 Invention Example 407 2.50 1050 92 10 0.65 0.29 0.86 0.966 1.29 1.51 1050 30 Invention Example 408 2.50 1050 92 10 0.66 0.29 0.85 0.968 1.29 1.50 1050 30 Invention Example 409 2.50 1050 92 10 0.88 0.03 0.85 0.969 1.28 1.49 1050 30 Comparative Example 410 2.50 850 92 10 0.85 0.28 0.84 0.968 1.28 1.48 1050 30 Comparative Example 411 1.33 850 85 10 0.66 0.02 0.85 0.964 1.30 1.51 1050 30 Comparative Example 412 0.50 1050 60 10 0.66 0.29 0.25 0.961 1.31 1.51 1050 30 Comparative Example 413 1.33 850 85 15 0.64 0.28 0.85 1.030 1.31 1.49 1050 30 Comparative Example 414 1.33 850 85 20 0.65 0.27 0.85 0.961 0.79 1.51 1050 30 Comparative Example 415 1.33 850 85 25 0.64 0.28 0.84 0.967 1.30 0.90 1050 30 Comparative Example 416 2.50 1050 92 10 0.64 0.28 0.86 0.961 1.30 1.49 940 30 Comparative Example 417 2.50 1050 92 10 0.64 0.29 0.85 0.961 1.29 1.49 1070 30 Comparative Example 418 2.50 1050 92 10 0.64 0.29 0.85 0.960 1.30 1.48 680 7200 Comparative Example 419 2.50 1050 92 10 0.65 0.28 0.85 0.963 1.30 1.48 930 7200 Comparative Example 420 1.33 850 84 15 0.65 0.28 0.86 1.029 1.31 1.49 1050 30 Comparative Example 421 2.50 1050 92 10 0.65 0.28 0.85 0.962 1.29 1.49 1050 30 Invention Example 422 2.50 1050 92 10 0.64 0.29 0.85 0.961 1.30 1.49 1050 30 Invention Example 423 2.50 1050 92 10 0.64 0.28 0.84 0.959 1.30 1.49 1050 30 Invention Example 424 2.50 1050 92 10 0.64 0.29 0.84 0.963 1.29 1.48 1050 30 Invention Example 425 2.50 1050 92 10 0.64 0.28 0.84 0.961 1.30 1.50 1050 30 Invention Example 426 2.50 1050 92 10 0.65 0.28 0.85 0.960 1.30 1.48 1050 30 Invention Example 427 2.50 1050 92 10 0.65 0.28 0.86 0.963 1.29 1.48 1050 30 Invention Example 428 2.50 1050 92 10 0.64 0.28 0.85 0.959 1.29 1.49 1050 30 Invention Example 429 2.50 1050 92 10 0.64 0.28 0.85 0.963 1.29 1.49 1050 30 Invention Example 430 2.50 1050 92 10 0.65 0.29 0.85 0.962 1.30 1.49 1050 30 Invention Example 431 2.50 1050 92 10 0.64 0.28 0.84 0.959 1.30 1.49 1050 30 Invention Example 432 2.50 1050 92 10 0.64 0.29 0.85 0.964 1.30 1.49 1050 30 Invention Example 433 2.50 1050 92 10 0.64 0.29 0.86 0.962 1.29 1.48 1050 30 Invention Example 434 2.50 1050 92 10 0.64 0.29 0.86 0.959 1.29 1.49 1050 30 Invention Example 435 2.50 1050 92 10 0.65 0.28 0.85 0.959 1.29 1.49 1050 30 Invention Example 436 2.50 1050 92 10 0.65 0.29 0.85 0.961 1.30 1.49 1050 30 Invention Example 437 2.50 1050 92 10 0.65 0.28 0.85 0.964 1.29 1.48 1050 30 Invention Example 438 2.50 1050 92 10 0.64 0.29 0.84 0.963 1.30 1.49 1050 30 Invention Example 439 2.50 1050 92 10 0.88 0.04 0.86 0.972 1.29 1.49 1050 30 Comparative Example 440 2.50 1050 92 10 0.89 0.04 0.84 0.970 1.29 1.48 1050 30 Comparative Example 441 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 442 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 443 2.50 1050 92 10 0.89 0.04 0.85 0.972 1.28 1.47 1050 30 Comparative Example 444 2.50 1050 92 10 0.89 0.03 5.85 0.968 1.28 1.48 1050 30 Comparative Example 445 2.50 1050 92 10 0.88 0.03 0.86 0.967 1.28 1.48 1050 30 Comparative Example 446 2.50 1050 92 10 0.88 0.03 0.85 0.968 1.29 1.49 1050 30 Comparative Example 447 2.50 1050 92 Cracking occurs during cold rolling Comparative Example 448 2.50 1050 92 10 0.64 0.29 0.85 0.959 1.29 1.48 1050 30 Invention Example indicates data missing or illegible when filed

TABLE-US-00012 TABLE 8 EBSD observation result Second after second heat treatment heat treatment S / S.sub.100/ S.sub.100/ d.sub.100/ d.sub.100/ d.sub.100/ W10/400 W15/50(C)/ No. S S S d d d (W/kg) W15/50(L) Note 401 0.43 0.35 0.74 1.03 1.04 0.98 10.5 1.11 Invention Example 402 0.44 0.35 0.74 1.02 1.04 0.98 10.6 1.10 Invention Example 403 0.44 0.34 0.76 1.01 1.03 0.98 10.5 1.10 Invention Example 404 0.46 0.33 0.74 1.03 1.04 0.99 10.5 1.08 Invention Example 405 0.44 0.34 0.77 1.02 1.04 0.99 10.4 1.12 Invention Example 406 0.45 0.35 0.76 1.02 1.05 0.99 10.5 1.11 Invention Example 407 0.45 0.37 0.75 1.02 1.05 0.99 10.6 1.12 Invention Example 408 0.43 0.37 0.73 1.02 1.03 0.98 10.5 1.09 Invention Example 409 0.82 0.05 0.73 1.02 1.04 0.99 15.6 1.38 Comparative Example 410 0.81 0.35 0.74 1.02 1.03 0.98 12.4 1.43 Comparative Example 411 0.47 0.02 0.74 1.02 1.04 0.98 12.3 1.41 Comparative Example 412 0.44 0.18 0.25 1.02 1.04 0.98 12.4 1.40 Comparative Example 413 0.76 0.13 0.75 0.95 1.04 0.98 12.2 1.38 Comparative Example 414 0.74 0.11 0.73 1.03 0.93 0.99 12.3 1.38 Comparative Example 415 0.74 0.12 0.75 1.01 1.03 0.92 12.4 1.41 Comparative Example 416 0.82 0.06 0.73 1.02 1.04 0.99 15.6 1.42 Comparative Example 417 0.81 0.35 0.74 1.02 1.03 0.98 12.4 1.40 Comparative Example 418 0.82 0.05 0.73 1.02 1.04 0.99 15.6 1.38 Comparative Example 419 0.81 0.35 0.74 1.02 1.03 0.98 12.4 1.39 Comparative Example 420 0.76 0.13 0.75 0.94 1.04 0.98 12.2 1.43 Comparative Example 421 0.43 0.34 0.73 1.02 1.04 0.98 10.5 1.13 Invention Example 422 0.43 0.34 0.75 1.03 1.04 0.98 10.5 1.09 Invention Example 423 0.44 0.35 0.74 1.03 1.05 0.98 10.5 1.11 Invention Example 424 0.43 0.36 0.75 1.03 1.04 0.98 10.4 1.12 Invention Example 425 0.43 0.35 0.73 1.04 1.05 0.97 10.6 1.10 Invention Example 426 0.43 0.34 0.73 1.02 1.04 0.98 10.5 1.08 Invention Example 427 0.44 0.35 0.73 1.03 1.04 0.99 10.6 1.13 Invention Example 428 0.44 0.34 0.74 1.03 1.04 0.99 10.5 1.11 Invention Example 429 0.43 0.36 0.73 1.03 1.04 0.98 10.5 1.11 Invention Example 430 0.43 0.34 0.74 1.02 1.04 0.98 10.4 1.12 Invention Example 431 0.43 0.34 0.73 1.02 1.05 0.98 10.5 1.07 Invention Example 432 0.43 0.34 0.73 1.03 1.04 0.98 10.5 1.13 Invention Example 433 0.43 0.35 0.73 1.03 1.05 0.98 10.5 1.09 Invention Example 434 0.44 0.35 0.73 1.02 1.04 0.98 10.4 1.12 Invention Example 435 0.43 0.35 0.74 1.03 1.04 0.98 10.6 1.09 Invention Example 436 0.43 0.35 0.75 1.03 1.05 0.97 10.4 1.10 Invention Example 437 0.44 0.34 0.73 1.02 1.04 0.99 10.5 1.09 Invention Example 438 0.43 0.34 0.73 1.03 1.05 0.99 10.4 1.13 Invention Example 439 0.83 0.05 0.74 1.03 1.03 0.98 15.5 1.41 Comparative Example 440 0.81 0.04 0.74 1.01 1.04 0.99 15.6 1.38 Comparative Example 441 Not evaluated since cracking occurs during cold rolling Comparative Example 442 Not evaluated since cracking occurs during cold rolling Comparative Example 443 0.82 0.05 0.74 1.01 1.03 0.98 15.6 1.37 Comparative Example 444 0.82 0.05 0.74 1.02 1.04 0.99 15.7 1.42 Comparative Example 445 0.83 0.04 0.74 1.01 1.03 0.98 15.6 1.43 Comparative Example 446 0.81 0.04 0.74 1.02 1.04 0.99 15.7 1.42 Comparative Example 447 Not evaluated since cracking occurs during cold rolling Comparative Example 448 0.44 0.35 0.73 1.02 1.05 0.94 10.6 1.21 Invention Example indicates data missing or illegible when filed

[0279] Underlined values in Table 7A, Table 7B, and Table 8 indicate conditions deviating from the scope of the present invention. In all of No. 401 to No. 408, No. 421 to No. 438, and No. 448, which are invention examples, the iron losses W10/400 were favorable values.

[0280] On the other hand, in No. 409, which is a comparative example, the Mn concentration was high, and the value of the left side of Formula (1) was more than 0.00 (a composition that underwent ?-? transformation), which made S.sub.tyl/S.sub.tot and S.sub.100/S.sub.tot each deviate from the range of Formula (20) or Formula (21). As a result, the iron loss W10/400 was high. In No. 410 to No. 420, which are comparative examples, since the temperature in the hot-rolled sheet annealing and/or the rolling reduction in the cold rolling were not optimal, at least one of Formula (20) to Formula (24) was not satisfied, and, as a result, the iron losses W10/400 were high.

[0281] In addition, in No. 439 to No. 447, which are comparative examples, since the chemical compositions were outside the scope of the present invention, Formula (20) and Formula (21) were not satisfied, and the iron losses W10/400 became high or cracking occurred during the cold rolling.

Fifth Example

[0282] Molten steel was cast, thereby producing ingots having chemical compositions shown in Table 9A. Here, the column Left side of Formula (1) indicates the values of the left side of Formula (1) described above. After that, the produced ingots were hot-rolled by being heated up to 1150? C. and rolled such that the sheet thicknesses became as shown in Table 9B. In addition, after the end of finish rolling, the hot-rolled steel sheets were cooled with water and coiled. The temperatures (finish temperatures) in a stage of the final pass of the finish rolling at this time were 830? C., and the coiling temperatures were within a range of 500? C. to 700? C.

[0283] Next, hot-rolled sheet annealing was performed on the hot-rolled steel sheets under conditions shown in Table 9B for 30 seconds, scales were removed by pickling, and cold rolling was performed at rolling reductions shown in Table 9B. In addition, intermediate annealing was performed in a non-oxidizing atmosphere at 800? C. for 30 seconds. Next, the second round of cold rolling (skin pass rolling) was performed at rolling reductions shown in Table 9B.

[0284] Next, in order to investigate the texture, a part of each of the steel sheets was cut, the cut test piece was processed to reduce the thickness to ?, and EBSD observation (step intervals: 100 nm) was performed on the processed surface. The areas and average KAM values of kinds shown in Table 8 were obtained by EBSD observation.

[0285] In addition, as a second heat treatment, annealing was performed on the steel sheets at a temperature of 800? C. for 2 hours. From each of the steel sheets after the second heat treatment, 55 mm?55 mm sample pieces were collected as measurement samples. The samples were collected using a shearing machine. In addition, as the magnetic characteristics, the iron losses W10/400 (average value of the rolling direction and the width direction), W15/50 (C), and W15/50 (L) were measured in the same manner as in First Example, and W15/50 (C)/W15/50 (L) were obtained. The measurement results are shown in Table 10.

TABLE-US-00013 TABLE 9A Chemical composition (mass %, remainder is Fe and impurities) sol. No. C Si Al S N Mn Sn Sb P Cr Mg 501 0.0010 3.20 0.59 0.0017 0.0019 0.19 0.003 502 0.0010 3.20 0.59 0.0023 0.0022 0.20 0.05 0.003 503 0.0011 3.21 0.60 0.0022 0.0020 0.20 0.05 0.003 504 0.0009 3.21 0.60 0.0021 0.0021 0.21 0.05 0.003 505 0.0009 3.21 0.60 0.0021 0.0021 0.20 0.003 0.0051 506 0.0009 3.20 0.61 0.0017 0.0019 0.19 0.003 507 0.0011 3.19 0.59 0.0022 0.0020 0.19 0.003 508 0.0010 3.21 0.61 0.0023 0.0020 0.19 0.003 509 0.0009 3.19 0.59 0.0020 0.0019 0.20 0.003 510 0.0010 3.20 0.60 0.0018 0.0019 0.20 0.003 511 0.0012 3.21 0.60 0.0019 0.0019 0.19 0.003 512 0.0010 3.19 0.60 0.0020 0.0021 0.20 0.003 513 0.0009 3.21 0.60 0.0017 0.0019 0.20 0.003 514 0.0010 3.21 0.60 0.0021 0.0021 0.21 0.003 515 0.0010 3.20 0.59 0.0017 0.0019 0.19 0.093 Chemical composition (mass %, remainder is Fe and impurities) Left side of Formula No. Ca Sr Ba Ce La Nd Pr Zn Cd (1) 501 ?3.60 502 ?3.59 503 ?3.62 504 ?3.61 505 ?3.61 506 0.0047 ?3.61 507 0.0047 ?3.59 508 0.0052 ?3.62 509 0.0051 ?3.58 510 0.0053 ?3.61 511 0.0051 ?3.61 512 0.0053 ?3.60 513 0.0049 ?3.61 514 0.0051 ?3.60 515 ?3.60

TABLE-US-00014 TABLE 9B After hot Hot-rolled sheet rolling annealing Sheet Annealing Rolling reduction (%) thickness temperature Cold Skin pass No. (mm) (? C.) rolling rolling Note 501 2.50 1050 92 10 Invention Example 502 2.50 1050 92 10 Invention Example 503 2.50 1050 92 10 Invention Example 504 2.50 1050 92 10 Invention Example 505 2.50 1050 92 10 Invention Example 506 2.50 1050 92 10 Invention Example 507 2.50 1050 92 10 Invention Example 508 2.50 1050 92 10 Invention Example 509 2.50 1050 92 10 Invention Example 510 2.50 1050 92 10 Invention Example 511 2.50 1050 92 10 Invention Example 512 2.50 1050 92 10 Invention Example 513 2.50 1050 92 10 Invention Example 514 2.50 1050 92 10 Invention Example 515 2.50 1050 92 10 Invention Example

TABLE-US-00015 TABLE 10 After second EBSD observation result after skin pass rolling heat treatment S / S.sub.100/ S.sub.100/ K.sub.100/ K.sub.100/ S.sub.100/ K.sub.100/ W10/400 W15/50(C)/ No. K K K.sub.100 K.sub.110 S S S K K S.sub.110 K.sub.110 (W/kg) W15/50(L) Note 501 0.371 0.364 0.363 0.364 0.72 0.14 0.71 0.979 0.997 5.61 0.996 10.5 1.10 Invention Example 502 0.370 0.365 0.363 0.365 0.69 0.21 0.77 0.980 0.996 7.09 0.996 10.3 1.07 Invention Example 503 0.371 0.364 0.364 0.364 0.67 0.21 0.77 0.980 0.999 7.09 0.998 10.3 1.09 Invention Example 504 0.372 0.365 0.362 0.364 0.69 0.22 0.78 0.975 0.993 7.11 0.995 10.4 1.11 Invention Example 505 0.370 0.364 0.364 0.365 0.74 0.14 0.72 0.982 0.999 5.59 0.996 10.1 1.12 Invention Example 506 0.371 0.365 0.362 0.364 0.73 0.14 0.73 0.978 0.994 5.60 0.994 10.2 1.13 Invention Example 507 0.371 0.364 0.363 0.365 0.73 0.15 0.73 0.977 0.996 5.59 0.994 10.2 1.11 Invention Example 508 0.372 0.363 0.363 0.365 0.72 0.16 0.73 0.976 0.999 5.60 0.995 10.2 1.13 Invention Example 509 0.371 0.365 0.363 0.364 0.73 0.16 0.73 0.978 0.994 5.60 0.996 10.2 1.11 Invention Example 510 0.371 0.363 0.363 0.366 0.74 0.15 0.72 0.976 0.998 5.59 0.992 10.2 1.07 Invention Example 511 0.371 0.365 0.362 0.366 0.72 0.14 0.73 0.976 0.993 5.59 0.991 10.0 1.08 Invention Example 512 0.371 0.364 0.363 0.365 0.72 0.16 0.71 0.977 0.997 5.61 0.995 10.2 1.12 Invention Example 513 0.372 0.364 0.363 0.365 0.73 0.15 0.71 0.977 0.998 5.59 0.995 10.0 1.10 Invention Example 514 0.371 0.365 0.362 0.366 0.72 0.14 0.71 0.977 0.994 5.59 0.991 10.0 1.08 Invention Example 515 0.371 0.367 0.362 0.365 0.73 0.14 0.71 0.977 0.988 5.61 0.993 10.4 1.11 Invention Example indicates data missing or illegible when filed

[0286] In all of No. 501 to No. 515, which are invention examples, Formula (3) to Formula (9) were satisfied, and the iron losses W10/400 were favorable values.

INDUSTRIAL APPLICABILITY

[0287] According to the present invention, since the area and the area ratio of specific crystal orientations in a cross section parallel to the steel sheet surface are appropriate, it is possible to obtain excellent magnetic characteristics even after shearing. Therefore, the present invention is highly industrially applicable.