STEEL SHEET FOR HOT STAMPING AND HOT-STAMPING FORMED BODY

Abstract

These steel sheet for hot stamping and hot-stamping formed body have predetermined chemical composition and metallographic structures, and, in textures of a surface layer region and an inside region, ratios between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111}<1-10> to {111}<−1-12> are controlled.

Claims

1-6. (canceled)

7. A steel sheet for hot stamping comprising, as a chemical composition, by mass %: C: 0.15 to 0.50%; Si: 0.0010% to 3.000%; Mn: 0.30% to 3.00%; Al: 0.0002% to 2.000%; P: 0.100% or less; S: 0.1000% or less; N: 0.0100% or less; Nb: 0% to 0.15%; Ti: 0% to 0.15%; V: 0% to 0.15%; Mo: 0% to 1.0%; Cr: 0% to 1.0%; Cu: 0% to 1.0%; Ni: 0% to 1.0%; B: 0% to 0.0100%; Ca: 0% to 0.010%; REM: 0% to 0.30%; and a remainder consisting of Fe and an impurity, wherein the steel sheet for hot stamping has a metallographic structure consisting of, by area ratio, a total of 20% to 80% of ferrite, granular bainite, bainite, and martensite and a remainder in microstructure consisting of pearlite and a carbide, in a texture between a surface and a sheet thickness ¼ position from the surface, a ratio between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111}<1-10> to {111}<−1-12> is less than 1.5, and in a texture between the sheet thickness ¼ position from the surface and a sheet thickness ½ position from the surface, a ratio between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111}<1-10> to {111}<−1-12> is less than 2.0.

8. The steel sheet for hot stamping according to claim 7, further comprising, as the chemical composition, by mass %, one or more of the group of: Nb: 0.05% to 0.15%, Ti: 0.05% to 0.15%, V: 0.05% to 0.15%, Mo: 0.05% to 1.0%, Cr: 0.05% to 1.0%, Cu: 0.05% to 1.0%, Ni: 0.05% to 1.0%, B: 0.0001% to 0.0100%, Ca: 0.001% to 0.010%, and REM: 0.001% to 0.30%.

9. The steel sheet for hot stamping according to claim 7, wherein a decarburization index is 0.085 or more.

10. The steel sheet for hot stamping according to claim 8, wherein a decarburization index is 0.085 or more.

11. A hot-stamping formed body comprising, as a chemical composition, by mass %: C: 0.15 to 0.50%; Si: 0.0010% to 3.000%; Mn: 0.30% to 3.00%; Al: 0.0002% to 2.000%; P: 0.100% or less; S: 0.1000% or less; N: 0.0100% or less; Nb: 0% to 0.15%; Ti: 0% to 0.15%; V: 0% to 0.15%; Mo: 0% to 1.0%; Cr: 0% to 1.0%; Cu: 0% to 1.0%; Ni: 0% to 1.0%; B: 0% to 0.0100%; Ca: 0% to 0.010%; REM: 0% to 0.30%; and a remainder consisting of Fe and an impurity, wherein the hot-stamping formed body has a metallographic structure containing, by area ratio, a total of 90% or more of martensite, bainite, and tempered martensite, in a texture between a surface and a sheet thickness ¼ position from the surface, a ratio between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111}<1-10> to {111}<−1-12> is less than 1.8, and in a texture between the sheet thickness ¼ position from the surface and a sheet thickness ½ position from the surface, a ratio between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111}<1-10> to {111}<−1-12> is less than 2.3.

12. The hot-stamping formed body according to claim 11, further comprising, as the chemical composition, by mass %, one or more of the group of: Nb: 0.05% to 0.15%, Ti: 0.05% to 0.15%, V: 0.05% to 0.15%, Mo: 0.05% to 1.0%, Cr: 0.05% to 1.0%, Cu: 0.05% to 1.0%, Ni: 0.05% to 1.0%, B: 0.0001% to 0.0100%, Ca: 0.001% to 0.010%, and REM: 0.001% to 0.30%.

13. The hot-stamping formed body according to claim 11, wherein a decarburization index is 0.085 or more.

14. The hot-stamping formed body according to claim 6, wherein a decarburization index is 0.085 or more.

15. A steel sheet for hot stamping comprising, as a chemical composition, by mass %: C: 0.15 to 0.50%; Si: 0.0010% to 3.000%; Mn: 0.30% to 3.00%; Al: 0.0002% to 2.000%; P: 0.100% or less; S: 0.1000% or less; N: 0.0100% or less; Nb: 0% to 0.15%; Ti: 0% to 0.15%; V: 0% to 0.15%; Mo: 0% to 1.0%; Cr: 0% to 1.0%; Cu: 0% to 1.0%; Ni: 0% to 1.0%; B: 0% to 0.0100%; Ca: 0% to 0.010%; REM: 0% to 0.30%; and a remainder comprising Fe and an impurity, wherein the steel sheet for hot stamping has a metallographic structure comprising, by area ratio, a total of 20% to 80% of ferrite, granular bainite, bainite, and martensite and a remainder in microstructure comprising pearlite and a carbide, in a texture between a surface and a sheet thickness ¼ position from the surface, a ratio between a pole density of an orientation group comprising {001}<1-10> to {001}<−1-10> and a pole density of an orientation group comprising {111}<1-10> to {111}<−1-12> is less than 1.5, and in a texture between the sheet thickness ¼ position from the surface and a sheet thickness ½ position from the surface, a ratio between a pole density of an orientation group comprising {001}<1-10> to {001}<−1-10> and a pole density of an orientation group comprising {111}<1-10> to {111}<−1-12> is less than 2.0.

16. A hot-stamping formed body comprising, as a chemical composition, by mass %: C: 0.15 to 0.50%; Si: 0.0010% to 3.000%; Mn: 0.30% to 3.00%; Al: 0.0002% to 2.000%; P: 0.100% or less; S: 0.1000% or less; N: 0.0100% or less; Nb: 0% to 0.15%; Ti: 0% to 0.15%; V: 0% to 0.15%; Mo: 0% to 1.0%; Cr: 0% to 1.0%; Cu: 0% to 1.0%; Ni: 0% to 1.0%; B: 0% to 0.0100%; Ca: 0% to 0.010%; REM: 0% to 0.30%; and a remainder comprising Fe and an impurity, wherein the hot-stamping formed body has a metallographic structure containing, by area ratio, a total of 90% or more of martensite, bainite, and tempered martensite, in a texture between a surface and a sheet thickness ¼ position from the surface, a ratio between a pole density of an orientation group comprising {001}<1-10> to {001}<−1-10> and a pole density of an orientation group comprising {111}<1-10> to {111}<−1-12> is less than 1.8, and in a texture between the sheet thickness ¼ position from the surface and a sheet thickness ½ position from the surface, a ratio between a pole density of an orientation group comprising {001}<1-10> to {001}<−1-10> and a pole density of an orientation group comprising {111}<1-10> to {111}<−1-12> is less than 2.3.

Description

EXAMPLES

[0208] Next, examples of the present invention will be described. Conditions in the examples are examples of conditions adopted to confirm the feasibility and effect of the present invention, and the present invention is not limited to the examples of conditions. The present invention is capable of adopting a variety of conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0209] Steel pieces manufactured by casting molten steel having a chemical composition shown in Table 1-1 and Table 1-2 were held in a temperature range of 1200° C. or higher for 20 minutes or longer, and then hot rolling, cold rolling, and decarburization annealing were performed under conditions shown in Table 2-1 to Table 2-6. A softening heat treatment was performed before the decarburization annealing as necessary. In addition, plating and plating annealing were performed as necessary. Therefore, steel sheets for hot stamping shown in Table 3-1 to Table 3-3 were obtained.

[0210] Hot stamping was performed on the obtained steel sheet for hot stamping under conditions shown in Table 4-A-1 to Table 4-A-3, thereby obtaining hot-stamping formed bodies. On some of the hot-stamping formed bodies, a tempering treatment was performed at 150° C. to 600° C. after the hot stamping. In addition, for some of the hot-stamping formed bodies, the hot-stamping formed bodies were partially irradiated with a laser, thereby forming partially softened regions. Table 5-A-1 to Table 5-A-3 show the microstructures and mechanical properties of the obtained hot-stamping formed bodies.

[0211] Underlined values in the tables indicate that the values are outside the scope of the present invention, the preferred manufacturing conditions are not satisfied, or property values are not preferable. In addition, “pole density ratio in texture of surface layer region” in Table 5-A-1 to Table 5-A-3 indicates the ratio between the pole density of the orientation group consisting of {001}<1-10> to {001}<−1-10> and the pole density of the orientation group consisting of {111}<1-10> to {111}<−1-12> in the texture between the surface and the sheet thickness ¼ position from the surface, and “pole density ratio in texture of inside region” indicates the ratio between the pole density of the orientation group consisting of {001}<1-10> to {001}<−1-10> and the pole density of the orientation group consisting of {111}<1-10> to {111}<−1-12> in the texture between the sheet thickness ¼ position from the surface and the sheet thickness ½ position from the surface. “Increase amount (N/°)” in Table 5-A-1 to Table 5-A-3 indicates “the load increase amount per unit bending angle (N/°) in a region from immediately after the start of the test to a bending angle 20°)”.

[0212] The metallographic structures and the textures of the steel sheet for hot stamping and the hot-stamping formed bodies were measured by the above-described measurement method. In addition, the mechanical properties of the hot-stamping formed body were evaluated by the following methods.

[0213] Tensile Strength and Uniform Elongation

[0214] The tensile (maximum) strength TS and uniform elongation uEl of the hot-stamping formed body were obtained by producing a No. 5 test piece from an arbitrary position of the hot-stamping formed body in accordance with JIS Z 2241: 2011 and performing a tensile test. The speed of a cross-head was set to 3 mm/min.

[0215] In a case where the tensile strength TS was 1500 MPa or more, the hot-stamping formed body was determined as acceptable for being excellent in terms of strength, and, in a case where the tensile strength TS was less than 1500 MPa, the hot-stamping formed body was determined as unacceptable for being poor in strength.

[0216] Bending Angle and Load Capacity

[0217] The bending angle was evaluated by the following method based on the VDA standard (VDA238-100) specified by Verband der Automobilindustrie. In the present examples, displacement under the maximum load that was obtained in a bending test was converted to an angle based on VDA, thereby obtaining the maximum bending angle α (°). In a case where the product (TS×α) of the tensile strength TS and the maximum bending angle α obtained by the above-described method was 75000 MPa.Math.° or more, the hot-stamping formed body was determined as acceptable for being excellent in terms of bendability, and, in a case where the product was less than 75000 MPa.Math.°, the hot-stamping formed body was determined as unacceptable for being poor in bendability.

[0218] The load capacity was evaluated with the load increase amount per unit bending angle in a region from immediately after the start of the test to a bending angle of 20° in a load stroke curve that is obtained in the bending test. In a case where the load increase amount per unit bending angle was 400 N/° or more, the hot-stamping formed body was determined as acceptable for being excellent in terms of the load capacity, and, in a case where the load increase amount per unit bending angle was less than 400 N/°, the hot-stamping formed body was determined as unacceptable for being poor in the load capacity.

[0219] The conditions in the bending test were as described below.

[0220] Dimensions of test piece: 60 mm (rolling direction)×30 mm (a direction parallel to a sheet width direction)

[0221] Test piece sheet thickness: 1.6 mm

[0222] Bending ridge: A direction parallel to a sheet width direction

[0223] Testing method: Supported by rolls and pressed by a punch

[0224] Roll diameter: φ 30 mm

[0225] Punch shape: Tip R=0.4 mm

[0226] Distance between rolls: 2.0×sheet thickness (mm)+0.5 mm

[0227] Pressing speed: 20 mm/min

[0228] Tester: SHIMADZU AUTOGRAPH 20 kN

[0229] From Table 5-A-1 to Table 5-A-3, it is found that the hot-stamping formed bodies that were the present invention examples had excellent strength and bendability and has a high load capacity.

[0230] On the other hand, it is found that the hot-stamping formed bodies that were the comparative examples were poor in one or more properties.

TABLE-US-00001 TABLE 1-1 Steel Chemical composition (mass %), remainder: Fe and impurity No. C Si Mn Al P S N Nb Ti V Mo Cr Cu Ni B Ca REM Note 1 0.12 0.200 1.60 0.026 0.010 0.0012 0.0056 Comparative Steel 2 0.21 0.130 1.20 0.026 0.012 0.0010 0.0081 Present Invention Steel 3 0.31 0.300 1.30 0.031 0.009 0.0036 0.0030 Present Invention Steel 4 0.36 0.200 1.40 0.030 0.015 0.0029 0.0047 Present Invention Steel 5 0.45 0.120 1.60 0.031 0.015 0.0025 0.0059 Present Invention Steel 6 0.51 0.210 1.70 0.040 0.013 0.0031 0.0086 Comparative Steel 7 0.18  0.0005 1.30 0.038 0.015 0.0026 0.0044 Comparative Steel 8 0.35 0.005 1.20 0.029 0.009 0.0011 0.0044 Present Invention Steel 9 0.35 0.200 1.00 0.027 0.011 0.0037 0.0094 Present Invention Steel 10 0.35 1.000 1.40 0.029 0.015 0.0019 0.0032 Present Invention Steel 11 0.35 3.200 1.60 0.033 0.015 0.0018 0.0095 Comparative Steel 12 0.35 0.240 0.20 0.028 0.014 0.0015 0.0098 Comparative Steel 13 0.35 0.220 0.50 0.039 0.012 0.0015 0.0086 Present Invention Steel 14 0.35 0.180 1.30 0.044 0.014 0.0008 0.0065 Present Invention Steel 15 0.35 0.290 2.00 0.037 0.013 0.0026 0.0047 Present Invention Steel 16 0.35 0.280 3.20 0.027 0.010 0.0014 0.0030 Comparative Steel 17 0.35 0.260 1.50 0.000 0.012 0.0030 0.0069 Comparative Steel 18 0.35 0.220 1.70 0.001 0.009 0.0040 0.0047 Present Invention Steel 19 0.35 0.280 1.00 0.030 0.014 0.0040 0.0070 Present Invention Steel 20 0.35 0.230 1.50 1.700 0.013 0.0023 0.0060 Present Invention Steel 21 0.35 0.120 1.90 2.200 0.014 0.0007 0.0038 Comparative Steel 22 0.35 0.190 1.70 0.045 0.001 0.0018 0.0073 Present Invention Steel Underlines indicate that the corresponding values are outside the scope of the present invention.

TABLE-US-00002 TABLE 1-2 Steel Chemical composition (mass %), remainder: Fe and impurity No. C Si Mn Al P S N Nb Ti V Mo Cr Cu Ni B Ca REM Note 23 0.35 0.120 1.30 0.035 0.008 0.0020 0.0094 Present Invention Steel 24 0.35 0.220 2.00 0.039 0.150 0.0035 0.0036 Comparative Steel 25 0.35 0.110 1.30 0.043 0.014 0.0003 0.0070 Present Invention Steel 26 0.35 0.150 1.30 0.041 0.008 0.0030 0.0065 Present Invention Steel 27 0.35 0.250 1.10 0.030 0.011 0.1500 0.0057 Comparative Steel 28 0.35 0.270 1.50 0.035 0.013 0.0013 0.0008 Present Invention Steel 29 0.35 0.280 1.40 0.030 0.009 0.0016 0.0040 Present Invention Steel 30 0.35 0.240 1.70 0.035 0.012 0.0032 0.1200 Comparative Steel 31 0.37 0.240 1.00 0.028 0.011 0.0038 0.0093 0.05 Present Invention Steel 32 0.37 0.110 2.00 0.036 0.009 0.0015 0.0072 0.05 Present Invention Steel 33 0.37 0.190 1.30 0.038 0.015 0.0034 0.0031 0.05 Present Invention Steel 34 0.37 0.220 1.20 0.025 0.009 0.0017 0.0076 0.2 Present Invention Steel 35 0.37 0.140 1.20 0.030 0.015 0.0033 0.0083 0.4 Present Invention Steel 36 0.37 0.110 1.40 0.041 0.009 0.0020 0.0089 0.3 Present Invention Steel 37 0.37 0.270 1.30 0.045 0.012 0.0020 0.0082 0.4 Present Invention Steel 38 0.35 0.100 1.10 0.045 0.013 0.0033 0.0038 0.0025 Present Invention Steel 39 0.35 0.150 1.30 0.028 0.011 0.0026 0.0061 0.006 Present Invention Steel 40 0.35 0.170 1.40 0.028 0.012 0.0036 0.0067 0.20 Present Invention Steel 41 0.35 2.890 1.42 0.030 0.014 0.0022 0.0039 Present Invention Steel 42 0.35 0.297 2.78 0.031 0.012 0.0024 0.0044 Present Invention Steel 43 0.35 0.124 1.31 0.037 0.091 0.0025 0.0097 Present Invention Steel 44 0.35 0.147 1.29 0.045 0.008 0.0870 0.0059 Present Invention Steel Underlines indicate that the corresponding values are outside the scope of the present invention.

TABLE-US-00003 TABLE 2-1 Hot rolling Average Elapsed cooling rate Rolling Rolling time from in temperature temperature reduction Rolling end of hot range from hot one pass one pass Final reduction rolling to rolling end Steel before final before final roiling of final start of temperature Coiling sheet Steel rolling rolling temperature rolling cooling to 450° C. temperature No. No. (° C.) (%) (° C.) (%) (sec) (° C./s) (° C.) 1  1 856 23 831 10 4.2 7 691 2  2 858 19 807 8 2.5 5 675 3  3 857 21 807 6 3.6 8 686 4  4 873 17 819 12 4.0 9 682 5  5 875 17 825 6 3.6 9 634 6  6 867 17 813 6 4.3 9 609 7  7 872 18 824 10 3.3 8 604 8  8 875 22 835 10 4.4 5 614 9  9 853 23 819 6 3.0 6 682 10 10 860 18 805 11 3.3 6 694 11 11 876 20 832 9 4.4 6 614 12 12 867 22 810 12 4.3 6 680 13 13 855 17 807 8 4.5 7 658 14 14 870 22 820 6 4.0 9 647 15 15 862 21 831 10 3.1 8 609 16 16 854 23 828 6 3.6 7 633 17 17 875 19 808 10 4.1 6 623 18 18 872 23 825 10 4.2 6 680 19 19 858 18 807 8 2.9 9 642 20 20 862 18 810 12 4.1 6 651 21 21 860 20 824 9 3.7 5 645 22 22 852 23 812 10 3.2 6 699 23 23 872 21 818 7 3.0 5 646 24 24 875 19 831 12 3.9 5 622 25 25 864 22 811 9 2.8 5 625 26 26 869 19 820 10 4.1 7 695 27 27 866 22 810 7 3.9 9 603 28 28 857 22 808 12 4.5 6 641 29 29 862 23 824 11 4.5 5 699 30 30 868 23 829 10 3.6 6 696 Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00004 TABLE 2-2 Hot rolling Average Elapsed cooling rate Rolling Rolling time from in temperature temperature reduction Rolling end of hot range from hot one pass one pass Final reduction rolling to rolling end Steel before final before final roiling of final start of temperature Coiling sheet Steel rolling rolling temperature rolling cooling to 450° C. temperature No. No. (° C.) (%) (° C.) (%) (sec) (° C./s) (° C.) 31 31 867 19 817 11  4.3 6 689 32 32 866 21 822 9 3.0 6 679 33 33 868 23 819 11  4.1 7 629 34 34 867 19 808 10  3.2 5 671 35 35 876 19 826 7 2.5 7 625 36 36 859 18 816 9 2.7 7 638 37 37 851 19 815 6 3.6 6 689 38 38 868 22 822 8 2.6 9 685 39 39 854 22 822 7 2.7 6 618 40 40 864 19 808 9 3.8 8 699 41 4 800 22 820 9 3.7 9 616 42 4 860 19 820 8 3.0 9 689 43 4 950 21 825 7 3.7 9 684 44 4 873  7 828 8 3.9 6 679 45 4 872 20 825 9 3.2 7 671 46 4 854 35 810 8 3.0 6 615 47 4 850 23 770 9 3.0 5 682 48 4 873 21 820 10  2.5 8 632 49 4 853 23 870 12  4.4 5 672 50 4 853 21 818 4 2.8 7 639 51 4 873 23 823 8 4.3 7 603 52 4 861 22 831 18  2.8 5 689 53 4 862 18 825 6 1.5 9 694 54 4 856 18 827 11  3.5 5 692 55 4 875 21 830 8 6.7 6 611 56 4 875 18 832 10  2.8 7 690 57 4 869 20 813 8 2.5 9 665 58 4 866 22 808 6 3.0 15  617 59 4 872 23 810 7 4.4 5 550 60 4 887 19 808 11  4.2 8 650 Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00005 TABLE 2-3 Hot rolling Average Elapsed cooling rate Rolling Rolling time from in temperature temperature reduction Rolling end of hot range from hot one pass one pass Final reduction rolling to rolling end Steel before final before final roiling of final start of temperature Coiling sheet Steel rolling rolling temperature rolling cooling to 450° C. temperature No. No. (° C.) (%) (° C.) (%) (sec) (° C./s) (° C.) 61 4 866 20 823 7 2.5 9 750 62 4 856 21 834 10 2.5 5 630 63 4 860 20 834 8 4.5 9 681 64 4 855 20 817 9 4.1 7 603 65 4 850 17 812 11 2.9 7 685 66 4 856 23 832 11 4.5 6 699 67 4 870 23 832 8 4.4 6 685 68 4 855 21 821 12 4.4 6 676 69 4 867 23 814 9 3.6 6 638 70 4 867 22 831 7 4.4 8 657 71 4 875 18 832 8 4.1 9 663 72 4 864 17 805 11 3.0 7 653 73 4 866 21 809 12 3.0 9 628 74 4 871 22 812 7 3.6 5 636 75 4 857 22 807 8 4.0 9 602 76 4 873 18 822 8 3.8 5 691 77 4 873 22 830 9 3.1 8 674 78 4 866 21 822 11 3.3 6 660 79 4 865 19 826 6 4.2 8 693 80 4 865 17 811 12 3.0 8 631 81 4 858 21 811 7 3.2 9 642 82 4 854 22 820 11 3.8 7 668 83 4 868 20 827 8 4.2 9 686 84 4 875 19 833 9 3.2 7 669 85 4 860 22 821 6 3.0 7 686 86 4 859 19 821 9 4.4 6 616 87 41 856 18 811 10 2.9 6 698 88 42 855 23 821 11 2.7 8 609 89 43 875 22 814 8 3.4 4 651 90 44 879 20 828 9 4.2 7 697 Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00006 TABLE 2-4 Decarburization annealing Residence Cold rolling time in Plating Presence or Cumulative Maximum temperature Plating Steel absence of rolling attainment range of Presence or annealing after sheet Steel softening heat reduction temperature 700° C. to 950° C. absence of decarburization No. No. treatment (%) (° C.) (sec) plating annealing Note 1  1 Absent 69 830 151 Comparative Example 2  2 Absent 66 818 166 Present Invention Example 3  3 Absent 36 784 172 Present Invention Example 4  4 Absent 30 773 135 Present Invention Example 5  5 Absent 41 808 216 Present Invention Example 6  6 Absent 39 811 268 Comparative Example 7  7 Absent 45 789 231 Comparative Example 8  8 Absent 45 818 273 Present Invention Example 9  9 Absent 33 801 237 Present Invention Example 10 10 Absent 64 818 228 Present Invention Example 11 11 Absent 44 801 277 Comparative Example 12 12 Absent 66 775 209 Comparative Example 13 13 Absent 65 795 219 Present Invention Example 14 14 Absent 63 776 197 Present Invention Example 15 15 Absent 40 803 183 Present Invention Example 16 16 Absent 54 805 250 Comparative Example 17 17 Absent 64 810 177 Comparative Example 18 18 Absent 66 828 216 Present Invention Example 19 19 Absent 33 826 248 Present Invention Example 20 20 Absent 54 824 280 Present Invention Example 21 21 Absent 32 822 179 Comparative Example 22 22 Absent 31 827 167 Present Invention Example 23 23 Absent 40 786 197 Present Invention Example 24 24 Absent 32 823 167 Comparative Example 25 25 Absent 49 787 258 Present Invention Example 26 26 Absent 70 800 150 Present Invention Example 27 27 Absent 52 787 187 Comparative Example 28 28 Absent 43 817 140 Present Invention Example 29 29 Absent 49 808 148 Present Invention Example 30 30 Absent 46 813 265 Comparative Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00007 TABLE 2-5 Decarburization annealing Residence Cold rolling time in Plating Presence or Cumulative Maximum temperature Plating Steel absence of rolling attainment range of Presence or annealing after sheet Steel softening heat reduction temperature 700° C. to 950° C. absence of decarburization No. No. treatment (%) (° C.) (sec) plating annealing Note 31 31 Absent 51 808 209 Present Invention Example 32 32 Absent 55 778 270 Present Invention Example 33 33 Absent 46 792 167 Present Invention Example 34 34 Absent 57 819 246 Present Invention Example 35 35 Absent 54 815 267 Present Invention Example 36 36 Absent 69 774 275 Present Invention Example 37 37 Absent 43 804 240 Present Invention Example 38 38 Absent 65 822 238 Present Invention Example 39 39 Absent 56 784 209 Present Invention Example 40 40 Absent 58 824 130 Present Invention Example 41 4 Absent 41 775 251 Comparative Example 42 4 Absent 39 828 151 Present Invention Example 43 4 Absent 61 814 241 Comparative Example 44 4 Absent 37 828 173 Comparative Example 45 4 Absent 62 789 166 Present Invention Example 46 4 Absent 48 775 211 Comparative Example 47 4 Absent 40 806 265 Comparative Example 48 4 Absent 70 817 165 Present Invention Example 49 4 Absent 45 798 130 Comparative Example 50 4 Absent 44 811 232 Comparative Example 51 4 Absent 37 775 225 Present Invention Example 52 4 Absent 42 812 262 Comparative Example 53 4 Absent 33 817 255 Comparative Example 54 4 Absent 48 814 275 Present Invention Example 55 4 Absent 61 792 137 Present Invention Example 56 4 Absent 58 800 273 Present Invention Example 57 4 Absent 62 792 197 Present Invention Example 58 4 Absent 52 814 149 Comparative Example 59 4 Absent 37 812 215 Present Invention Example 60 4 Absent 67 779 276 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00008 TABLE 2-6 Decarburization annealing Residence Cold rolling time in Plating Presence or Cumulative Maximum temperature Plating Steel absence of rolling attainment range of Presence or annealing after sheet Steel softening heat reduction temperature 700° C. to 950° C. absence of decarburization No. No. treatment (%) (° C.) (sec) plating annealing Note 61 4 Absent 44 785 234 Comparative Example 62 4 Present 59 809 267 Present Invention Example 63 4 Absent 40 814 272 Present Invention Example 64 4 Absent 55 660 155 Comparative Example 65 4 Absent 31 720 269 Present Invention Example 66 4 Absent 64 800 263 Present Invention Example 67 4 Absent 61 900 247 Present Invention Example 68 4 Absent 50 970 263 Comparative Example 69 4 Absent 56 806  3 Comparative Example 70 4 Absent 62 770  60 Present Invention Example 71 4 Absent 54 770 180 Present Invention Example 72 4 Absent 45 812 900 Present Invention Example 73 4 Absent 54 793 1300  Comparative Example 74 4 Absent 44 803 234 Present Present Invention Example 75 4 Absent 56 773 189 Present Present Invention Example 76 4 Absent 67 777 268 Present Invention Example 77 4 Absent 58 798 138 Present Invention Example 78 4 Absent 35 829 246 Present Invention Example 79 4 Absent 52 799 211 Present Invention Example 80 4 Absent 33 801 151 Present invention Example 81 4 Absent 37 805 203 Present Invention Example 82 4 Absent 49 823 179 Present Invention Example 83 4 Absent 31 821 276 Present Invention Example 84 4 Absent 64 802 163 Present Invention Example 85 4 Absent 46 801 176 Present Invention Example 86 4 Absent 67 801 146 Present Invention Example 87 41 Absent 66 828 216 Present Invention Example 88 42 Absent 42 794 189 Present Invention Example 89 43 Absent 38 782 188 Present Invention Example 90 44 Absent 64 802 135 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00009 TABLE 3-1 Steel sheet for hot stamping Ratio between pole Ratio between pole density of orientation density of orientation group consisting of group consisting of {001} <1-10> to {001} <1-10> to {001} <−1-10> and {001} <−1-10> and Ferrite, pole density of pole density of granular orientation group orientation group bainite, consisting of consisting of bainite, Pearlite {111} <1-10> to {111} <1-10> to Steel and and {111} <−1-12> in {111} <−1-12> in Sheet sheet Steel martensite carbide texture of surface texture of Decarburization thickness No. No. (area %) (area %) layer region inside region index (mm) Note  1  1 28 72 1.3 1.9 0.174 1.6 Comparative Example  2  2 52 48 1.2 1.6 0.198 1.6 Present Invention Example  3  3 74 26 1.3 1.8 0.244 1.6 Present Invention Example  4  4 22 78 1.3 1.7 0.270 1.6 Present Invention Example  5  5 37 63 1.2 1.7 0.320 1.6 Present Invention Example  6  6 68 32 1.3 1.9 0.376 1.6 Comparative Example  7  7 22 78 1.3 1.7 0.283 1.6 Comparative Example  8  8 43 57 1.3 1.6 0.267 1.6 Present Invention Example  9  9 41 59 1.2 1.7 0.250 1.6 Present Invention Example 10 10 56 44 1.2 1.8 0.236 1.6 Present Invention Example 11 11 60 40 1.2 1.9 0.243 1.6 Comparative Example 12 12 43 57 1.3 1.8 0.241 1.6 Comparative Example 13 13 60 40 1.3 1.6 0.266 1.6 Present Invention Example 14 14 77 23 1.2 1.8 0.285 1.6 Present Invention Example 15 15 30 70 1.2 1.8 0.279 1.6 Present Invention Example 16 16 50 50 1.2 1.6 0.279 1.6 Comparative Example 17 17 21 79 1.3 1.7 0.261 1.6 Comparative Example 18 18 31 69 1.3 1.9 0.280 1.6 Present Invention Example 19 19 51 49 1.3 1.8 0.279 1.6 Present Invention Example 20 20 34 66 1.2 1.9 0.277 1.6 Present Invention Example 21 21 60 40 1.2 1.6 0.248 1.6 Comparative Example 22 22 28 72 1.3 1.6 0.268 1.6 Present Invention Example 23 23 66 34 1.2 1.7 0.280 1.6 Present Invention Example 24 24 25 75 1.2 1.7 0.257 1.6 Comparative Example 25 25 54 46 1.2 1.7 0.260 1.6 Present Invention Ex ample 26 26 75 25 1.2 1.6 0.261 1.6 Present Invention Example 27 27 52 48 1.2 1.8 0.273 1.6 Comparative Example 28 28 39 61 1.3 1.8 0.261 1.6 Present Invention Example 29 29 55 45 1.3 1.7 0.260 1.6 Present Invention Example 30 30 71 29 1.2 1.7 0.236 1.6 Comparative Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00010 TABLE 3-2 Steel sheet for hot stamping Ratio between pole Ratio between pole density of orientation density of orientation group consisting of group consisting of {001} <1-10> to {001} <1-10> to {001} <−1-10> and {001} <−1-10> and Ferrite, pole density of pole density of granular orientation group orientation group bainite, consisting of consisting of bainite, Pearlite {111} <1-10> to {111} <1-10> to Steel and and {111} <−1-12> in {111} <−1-12> in Sheet sheet Steel martensite carbide texture of surface texture of Decarburization thickness No. No. (area %) (area %) layer region inside region index (mm) Note 31 31 70 30 1.2 1.6 0.271 1.6 Present Invention Example 32 32 24 76 1.3 1.6 0.280 1.6 Present Invention Example 33 33 23 77 1.2 1.6 0.259 1.6 Present Invention Example 34 34 76 24 1.2 1.8 0.249 1.6 Present Invention Example 35 35 28 72 1.3 1.7 0.251 1.6 Present Invention Example 36 36 76 24 1.3 1.9 0.284 1.6 Present Invention Example 37 37 55 45 1.3 1.8 0.241 1.6 Present Invention Example 38 38 28 72 1.2 1.7 0.231 1.6 Present Invention Example 39 39 57 43 1.2 1.7 0.261 1.6 Present Invention Example 40 40 38 62 1.2 1.6 0.236 1.6 Present Invention Example 41 4 40 60 1.8 2.4 0.254 1.6 Comparative Example 42 4 58 42 1.2 1.5 0.275 1.6 Present Invention Example 43 4 37 63 1.8 2.2 0.277 1.6 Comparative Example 44 4 26 74 1.9 2.6 0.248 1.6 Comparative Example 45 4 49 51 0.8 1.1 0.239 1.6 Present Invention Example 46 4 40 60 1.9 2.4 0.239 1.6 Comparative Example 47 4 51 49 1.9 2.6 0.243 1.6 Comparative Example 48 4 72 28 1.1 1.1 0.268 1.6 Present Invention Example 49 4 57 43 1.9 2.3 0.243 1.6 Comparative Example 50 4 23 77 1.7 2.4 0.239 1.6 Comparative Example 51 4 69 31 1.1 1.5 0.263 1.6 Present Invention Example 52 4 21 79 1.9 2.3 0.251 1.6 Comparative Example 53 4 68 32 1.7 1.4 0.232 1.6 Comparative Example 54 4 43 57 1.3 1.7 0.274 1.6 Present Invention Example 55 4 27 73 1.2 1.4 0.260 1.6 Present Invention Example 56 4 69 31 0.9 1.2 0.246 1.6 Present Invention Example 57 4 31 69 1.3 1.8 0.230 1.6 Present Invention Example 58 4 33 67 1.8 2.6 0.243 1.6 Comparative Example 59 4 42 58 1.2 1.5 0.239 1.6 Present Invention Example 60 4 45 55 1.2 1.8 0.234 1.6 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00011 TABLE 3-3 Steel sheet for hot stamping Ratio between pole Ratio between pole density of orientation density of orientation group consisting of group consisting of {001} <1-10> to {001} <1-10> to {001} <−1-10> and {001} <−1-10> and Ferrite, pole density of pole density of granular orientation group orientation group bainite, consisting of consisting of bainite, Pearlite {111} <1-10> to {111} <1-10> to Steel and and {111} <−1-12> in {111} <−1-12> in Sheet sheet Steel martensite carbide texture of surface texture of Decarburization thickness No. No. (area %) (area %) layer region inside region index (mm) Note 61 4 69 31 1.9 2.2 0.271 1.6 Comparative Example 62 4 26 74 1.2 1.6 0.260 1.6 Present Invention Example 63 4 71 29 1.2 1.7 0.270 1.6 Present Invention Example 64 4 55 45 1.7 1.9 0.078 1.6 Comparative Example 65 4 25 75 1.2 1.7 0.159 1.6 Present Invention Example 66 4 57 43 0.9 1.2 0.221 1.6 Present Invention Example 67 4 80 20 1.2 1.7 0.342 1.6 Present Invention Example 68 4 35 65 1.9 1.6 0.520 1.6 Comparative Example 69 4 64 36 1.8 1.7 0.016 1.6 Comparative Example 70 4 72 28 1.3 1.8 0.097 1.6 Present Invention Example 71 4 36 64 0.9 1.3 0.261 1.6 Present Invention Example 72 4 75 25 1.3 1.7 0.423 1.6 Present Invention Example 73 4 72 28 1.6 1.8 0.514 1.6 Comparative Example 74 4 28 72 1.2 1.8 0.244 1.6 Present Invention Example 75 4 77 23 1.3 1.8 0.289 1.6 Present Invention Example 76 4 70 30 1.2 1.6 0.273 1.6 Present Invention Example 77 4 24 76 1.2 1.9 0.265 1.6 Present Invention Example 78 4 74 26 1.2 1.6 0.264 1.6 Present Invention Example 79 4 21 79 1.3 1.8 0.275 1.6 Present Invention Example 80 4 43 57 1.2 1.6 0.281 1.6 Present Invention Example 81 4 21 79 1.2 1.8 0.271 1.6 Present Invention Example 82 4 47 53 1.3 1.8 0.247 1.6 Present Invention Example 83 4 50 50 1.2 1.8 0.246 1.6 Present Invention Example 84 4 59 41 1.3 1.9 0.282 1.6 Present Invention Example 85 4 39 61 1.3 1.6 0.246 1.6 Present Invention Example 86 4 76 24 1.2 1.8 0.235 1.6 Present Invention Example 87 41 55 40 1.2 1.7 0.275 1.6 Present Invention Example 88 42 29 66 1.1 1.7 0.291 1.6 Present Invention Example 89 43 64 36 1.1 1.6 0.254 1.6 Present Invention Example 90 44 75 28 1.1 1.5 0.270 1.6 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00012 TABLE4-A-1 Hot stamping conditions Cooling rate to temperature range of Steel Heating Holding Forming 300° C. Partially Manufacturing Sheet Steel temperature time temperature or lower Tempering softened No. No. No. (° C.) (s) (° C.) (° C./s) treatment region Note 1  1  1 880 306 873 21 Comparative Example 2  2  2 890 325 866 31 Present Invention Example 3  3  3 960 231 864 42 Present Invention Example 4  4  4 930 330 868 48 Present Present Invention Example 5  5  5 880 295 875 25 Present Invention Example 6  6  6 970 322 876 35 Comparative Example 7  7  7 870 315 813 38 Comparative Example 8  8  8 870 324 868 27 Present Invention Example 9  9  9 920 237 828 37 Present Invention Example 10 10 10 870 192 849 28 Present Invention Example 11 11 11 940 293 808 44 Comparative Example 12 12 12 940 190 862 40 Comparative Example 13 13 13 970 251 811 34 Present Present Invention Example 14 14 14 900 225 796 37 Present Invention Example 15 15 15 910 294 816 25 Present Invention Example 16 16 16 870 316 805 37 Comparative Example 17 17 17 960 322 868 42 Comparative Example 18 18 18 940 293 874 43 Present Invention Example 19 19 19 930 192 871 35 Present Present Invention Example 20 20 20 940 282 797 42 Present Invention Example 21 21 21 960 270 877 49 Comparative Example 22 22 22 900 291 883 48 Present Invention Example 23 23 23 900 232 889 36 Present Invention Example 24 24 24 960 292 865 24 Comparative Example 25 25 25 960 238 825 18 Present Invention Example 26 26 26 920 214 852 17 Present Invention Example 27 27 27 890 206 833 19 Comparative Example 28 28 28 920 243 824 21 Present Invention Example 29 29 29 900 193 791 32 Present Invention Example 30 30 30 920 263 850 47 Comparative Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00013 TABLE 4-A-2 Hot stamping conditions Cooling rate to temperature range of Steel Heating Holding Forming 300° C. Partially Manufacturing Sheet Steel temperature time temperature or lower Tempering softened No. No. No. (° C.) (s) (° C.) (° C./s) treatment region Note 31 31 31 910 311 853 22 Present Invention Example 32 32 32 940 307 856 35 Present Invention Example 33 33 33 890 301 852 26 Present Invention Example 34 34 34 950 338 876 45 Present Invention Example 35 35 35 970 233 882 16 Present Invention Example 36 36 36 890 313 885 49 Present Invention Example 37 37 37 930 251 830 30 Present Invention Example 38 38 38 920 301 877 32 Present Invention Example 39 39 39 890 329 843 36 Present Invention Example 40 40 40 880 324 877 38 Present Invention Example 41 41 4 910 291 820 34 Comparative Example 42 42 4 970 330 812 29 Present Invention Example 43 43 4 950 280 853 17 Comparative Example 44 44 4 920 323 802 46 Comparative Example 45 45 4 900 221 847 49 Present Invention Example 46 46 4 890 339 865 23 Comparative Example 47 47 4 920 228 853 20 Comparative Example 48 48 4 870 227 816 35 Present Invention Example 49 49 4 940 258 872 27 Comparative Example 50 50 4 960 204 834 34 Comparative Example 51 51 4 920 253 890 20 Present Invention Example 52 52 4 870 262 877 30 Comparative Example 53 53 4 870 299 794 28 Comparative Example 54 54 4 920 192 812 15 Present Invention Example 55 55 4 930 339 829 19 Present Invention Example 56 56 4 960 302 887 50 Present Present Invention Example 57 57 4 920 273 811 48 Present Invention Example 58 58 4 900 259 821 21 Comparative Example 59 59 4 920 227 790 20 Present Invention Example 60 60 4 920 309 850 30 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00014 TABLE 4-A-3 Hot stamping conditions Cooling rate to temperature range of Steel Heating Holding Forming 300° C. Partially Manufacturing Sheet Steel temperature time temperature or lower Tempering softened No. No. No. (° C.) (s) (° C.) (° C./s) treatment region Note 61 61 4 960 312 858 28 Comparative Example 62 62 4 880 249 811 26 Present Invention Example 63 63 4 940 237 802 41 Present Invention Example 64 64 4 960 197 798 34 Comparative Example 65 65 4 960 304 812 23 Present Invention Example 66 66 4 910 322 836 19 Present Invention Example 67 67 4 890 336 799 20 Present Invention Example 68 68 4 920 308 800 39 Comparative Example 69 69 4 940 227 840 21 Comparative Example 70 70 4 960 240 866 15 Present Invention Example 71 71 4 960 280 829 35 Present Present Invention Example 72 72 4 910 225 820 27 Present Invention Example 73 73 4 970 207 889 47 Comparative Example 74 74 4 900 331 843 43 Present Invention Example 75 75 4 920 261 868 34 Present Invention Example 76 76 4 770 303 829 40 Comparative Example 77 77 4 920 238 807 21 Present Invention Example 78 78 4 1030  339 843 48 Comparative Example 79 79 4 910  45 884 49 Comparative Example 80 80 4 920 240 888 23 Present Invention Example 81 81 4 880 630 836 36 Comparative Example 82 82 4 960 290 600 32 Comparative Example 83 83 4 870 316 840 16 Present Invention Example 84 84 4 970 316 1030  47 Comparative Example 85 85 4 890 212 855 22 Present Invention Example 86 86 4 880 331 875 20 Present Invention Example 87 87 41 870 192 849 28 Present. Invention Example 88 88 42 910 294 816 25 Present Invention Example 89 89 43 900 232 889 36 Present Invention Example 90 90 44 920 214 852 17 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and manufacturing conditions are not preferable.

TABLE-US-00015 TABLE 5-A-1 Textures Ratio between pole Ratio between pole density of orientation density of orientation group consisting of group consisting of {001} <1-10> to {001} <1-10> to {001} <−1-10> and {001} <−1-10> and Microstructures pole density of pole density of Martensite, orientation group orientation group bainite, Ferrite consisting of consisting of and and {111} <1-10> to {111} <1-10> to Decarburization Steel tempered granular {111} <−1-12> in {111} <−1-12> in amount Manufacturing sheet Steel martensite bainite texture of surface texture of Decarburization No. No. No. (area %) (area %) layer region inside region index  1  1  1 100 0 1.6 2.0 0.194  2  2  2 98 2 1.5 2.1 0.228  3  3  3 97 3 1.7 1.9 0.274  4  4  4 98 2 1.7 2.2 0.300  5  5  5 98 2 1.5 2.2 0.340  6  6  6 98 2 1.5 2.2 0.396  7  7  7 96 4 1.6 2.2 0.313  8  8  8 100 0 1.6 1.9 0.297  9  9  9 100 0 1.6 2.2 0.270 10 10 10 97 3 1.7 2.1 0.266 11 11 11 99 1 1.6 2.0 0.263 12 12 12 100 0 1.7 2.1 0.271 13 13 13 95 5 1.7 2.2 0.296 14 14 14 97 3 1.7 2.2 0.305 15 15 15 97 3 1.7 2.2 0.299 16 16 16 99 1 1.7 1.9 0.309 17 17 17 99 1 1.7 2.0 0.281 18 18 18 99 1 1.7 2.2 0.300 19 19 19 100 0 1.6 2.0 0.299 20 20 20 96 4 1.7 1.9 0.307 21 21 21 100 0 1.7 2.2 0.278 22 22 22 98 2 1.7 2.2 0.288 23 23 23 95 5 1.6 2.0 0.310 24 24 24 99 1 1.6 1.9 0.277 25 25 25 98 2 1.6 2.1 0.290 26 26 26 98 2 1.7 2.2 0.281 27 27 27 95 5 1.7 2.2 0.303 28 28 28 96 4 1.6 2.2 0.281 29 29 29 98 2 1.6 2.2 0.280 30 30 30 95 5 1.8 1.9 0.266 Mechanical properties Load increase amount per unit bending angle in region from Tensile Maximum immediately after strength bending start of test to Manufacturing TS angle α TS × α bending angle 20° No. (MPa) (°) (MPa .Math. °) (N/°) Note  1 1274 70  89180 354 Comparative Example  2 1585 69 102465 438 Present Invention Example  3 1728 65 112320 585 Present Invention Example  4 1920 53 101760 594 Present Invention Example  5 2400 53 127200 643 Present Invention Example  6 2646 28  74088 605 Comparative Example  7 1261 72  90792 384 Comparative Example  8 2090 52 108680 585 Present Invention Example  9 2178 72 156816 610 Present Invention Example 10 2112 51 107712 590 Present Invention Example 11 1274 75  95550 377 Comparative Example 12 1261 88 110968 395 Comparative Example 13 2000 56 112000 570 Present Invention Example 14 2090 79 165110 600 Present Invention Example 15 1980 57 112860 574 Present Invention Example 16 1940 33  64020 616 Comparative Example 17 1900 38  72200 600 Comparative Example 18 1960 52 101920 574 Present Invention Example 19 1980 55 108900 580 Present Invention Example 20 1960 57 111720 584 Present Invention Example 21 1960 34  66640 614 Comparative Example 22 1960 79 154840 622 Present Invention Example 23 1980 58 114840 574 Present Invention Example 24 2000 35  70000 560 Comparative Example 25 1940 64 124160 611 Present Invention Example 26 1920 55 105600 577 Present Invention Example 27 1940 29  56260 580 Comparative Example 28 1900 60 114000 619 Present Invention Example 29 1960 58 113680 572 Present Invention Example 30 2000 32  64000 587 Comparative Example Underlines indicate that the corresponding values are outside the scope of the present invention and characteristics are not preferable.

TABLE-US-00016 TABLE 5-A-2 Textures Ratio between pole Ratio between pole density of orientation density of orientation group consisting of group consisting of {001} <1-10> to {001} <1-10> to {001} <−1-10> and {001} <−1-10> and Microstructures pole density of pole density of Martensite, orientation group orientation group bainite, Ferrite consisting of consisting of and and {111} <1-10> to {111} <1-10> to Decarburization Steel tempered granular {111} <−1-12> in {111} <−1-12> in amount Manufacturing sheet Steel martensite bainite texture of surface texture of Decarburization No. No. No. (area %) (area %) layer region inside region index 31 31 31 95 5 1.5 2.0 0.291 32 32 32 99 1 1.6 2.2 0.310 33 33 33 97 3 1.7 1.9 0.279 34 34 34 100 0 1.5 2.0 0.279 35 35 35 97 3 1.6 1.9 0.271 36 36 36 96 4 1.6 2.2 0.314 37 37 37 95 5 1.7 2.1 0.261 38 38 38 95 5 1.5 1.9 0.251 39 39 39 98 2 1.7 2.0 0.281 40 40 40 97 3 1.7 2.1 0.266 41 41 4 97 3 2.1 2.7 0.284 42 42 4 99 1 1.4 1.4 0.305 43 43 4 100 0 2.1 2.7 0.297 44 44 4 100 0 2.0 2.7 0.278 45 45 4 100 0 0.9 1.7 0.269 46 46 4 100 0 2.2 2.9 0.259 47 47 4 97 3 2.1 2.6 0.273 48 48 4 95 5 1.4 1.7 0.298 49 49 4 100 0 2.3 2.8 0.263 50 50 4 100 0 2.2 2.7 0.269 51 51 4 97 3 1.3 1.7 0.283 52 52 4 98 2 2.0 2.8 0.281 53 53 4 95 5 2.1 2.6 0.262 54 54 4 95 5 1.7 1.9 0.294 55 55 4 100 0 0.8 1.5 0.280 56 56 4 95 5 1.5 1.6 0.276 57 57 4 97 3 1.7 2.2 0.250 58 58 4 95 5 2.0 2.9 0.263 59 59 4 95 5 1.0 1.6 0.259 60 60 4 97 3 1.7 1.9 0.254 Mechanical properties Load increase amount per unit bending angle in region from Tensile Maximum immediately after strength bending start of test to Manufacturing TS angle α TS × α bending angle 20° No. (MPa) (°) (MPa .Math. °) (N/°) Note 31 2208 68 150144 601 Present Invention Example 32 2208 75 165600 609 Present Invention Example 33 2254 73 164542 601 Present Invention Example 34 2231 80 178480 605 Present Invention Example 35 2208 72 158976 609 Present Invention Example 36 2254 71 160034 612 Present Invention Example 37 2231 65 145015 602 Present Invention Example 38 2090 51 106590 572 Present Invention Example 39 1940 70 135800 616 Present Invention Example 40 1900 67 127300 604 Present Invention Example 41 1980 33  65340 518 Comparative Example 42 1960 60 117600 625 Present Invention Example 43 1960 34  66640 515 Comparative Example 44 1920 38  72960 499 Comparative Example 45 1900 64 121600 617 Present Invention Example 46 1920 32  61440 515 Comparative Example 47 1980 33  65340 492 Comparative Example 48 1920 75 144000 604 Present Invention Example 49 1900 34  64600 503 Comparative Example 50 2000 32  64000 517 Comparative Example 51 2000 79 158000 610 Present Invention Example 52 1980 35  69300 516 Comparative Example 53 1940 31  60140 506 Comparative Example 54 1980 51 100980 591 Present Invention Example 55 1960 76 148960 621 Present Invention Example 56 1960 78 152880 623 Present Invention Example 57 1920 57 109440 572 Present Invention Example 58 1920 35  67200 515 Comparative Example 59 1920 68 130560 611 Present Invention Example 60 1940 51 98940 583 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and characteristics are not preferable.

TABLE-US-00017 TABLE 5-A-3 Textures Ratio between pole Ratio between pole density of orientation density of orientation group consisting of group consisting of {001} <1-10> to {001} <1-10> to {001} <−1-10> and {001} <−1-10> and Microstructures pole density of pole density of Martensite, orientation group orientation group bainite, Ferrite consisting of consisting of and and {111} <1-10> to {111} <1-10> to Decarburization Steel tempered granular {111} <−1-12> in {111} <−1-12> in amount Manufacturing sheet Steel martensite bainite texture of surface texture of Decarburization No. No. No. (area %) (area %) layer region inside region index 61 61 4 100  0 2.2 2.9 0.301 62 62 4 98 2 1.5 2.1 0.290 63 63 4 100  0 1.5 2.0 0.290 64 64 4 98 2 2.0 2.1 0.079 65 65 4 100  0 1.5 2.1 0.179 66 66 4 95 5 1.2 1.5 0.241 67 67 4 97 3 1.7 1.9 0.372 68 68 4 99 1 2.2 2.1 0.540 69 69 4 99 1 2.3 1.9 0.036 70 70 4 99 1 1.7 2.2 0.117 71 71 4 99 1 1.3 1.8 0.278 72 72 4 95 5 1.5 2.1 0.453 73 73 4 96 4 2.0 2.3 0.534 74 74 4 96 4 1.7 2.2 0.264 75 75 4 99 1 1.6 1.9 0.319 76 76 4 99 1 2.0 2.9 0.293 77 77 4 95 5 1.5 2.2 0.295 78 78 4 100  0 1.5 2.6 0.284 79 79 4 100  0 1.9 2.8 0.305 80 80 4 97 3 1.7 1.9 0.301 81 81 4 95 5 1.5 2.6 0.291 82 82 4 85 15  1.6 2.0 0.267 83 83 4 97 3 1.6 2.2 0.276 84 84 4 100  0 1.6 2.7 0.312 85 85 4 98 2 1.5 2.2 0.276 86 86 4 99 1 1.7 1.9 0.255 87 87 41 98 2 1.6 2.0 0.295 88 88 42 96 4 1.6 1.9 0.321 89 89 43 95 5 1.6 1.9 0.274 90 90 44 97 3 1.7 2.0 0.290 Mechanical properties Load increase amount per unit bending angle in region from Tensile Maximum immediately after strength bending start of test to Manufacturing TS angle α TS × α bending angle 20° No. (MPa) (°) (MPa .Math. °) (N/°) Note 61 1940 33  64020 518 Comparative Example 62 1920 55 105600 582 Present Invention Example 63 1940 55 106700 592 Present Invention Example 64 1900 38  72200 566 Comparative Example 65 1940 56 108640 588 Present Invention Example 66 1960 74 145040 608 Present Invention Example 67 1900 51  96900 578 Present Invention Example 68 1992 37  74010 588 Comparative Example 69 1980 33  65340 560 Comparative Example 70 2000 55 110000 582 Present Invention Example 71 1980 77 152460 621 Present Invention Example 72 1900 52  98800 563 Present Invention Example 73 1998 37  74410 587 Comparative Example 74 1960 53 103880 593 Present Invention Example 75 1980 57 112860 590 Present Invention Example 76 1980 35  69300 564 Comparative Example 77 1900 52  98800 569 Present Invention Example 78 1980 37  73260 498 Comparative Example 79 1960 29  56840 576 Comparative Example 80 1940 54 104760 561 Present Invention Example 81 1980 36  71280 506 Comparative Example 82 1960 54 105840 345 Comparative Example 83 1980 57 112860 571 Present Invention Example 84 1920 57 109440 355 Comparative Example 85 1920 55 105600 575 Present Invention Example 86 1960 51  99960 569 Present Invention Example 87 2042 51 104142 584 Present Invention Example 88 1972 56 110432 565 Present Invention Example 89 1972 55 108460 583 Present Invention Example 90 1916 53 101548 577 Present Invention Example Underlines indicate that the corresponding values are outside the scope of the present invention and characteristics are not preferable.

INDUSTRIAL APPLICABILITY

[0231] According to the above-described aspects of the present invention, it is possible to provide a hot-stamping formed body having excellent strength and bendability and having high load capacity and a steel sheet for hot stamping enabling the obtainment of this hot-stamping formed body.