A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing ?-? transformation, and contains 0.0005% to 0.0050% of Ti, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl}<uvw> orientation (within a tolerance of 10?) when measured by EBSD is denoted as Ahkl-uvw, A411-011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 ?m to 40.0 ?m.

A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing - transformation, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl}<uvw>orientation (within a tolerance of 10) when measured by EBSD is denoted as Ahkl-uvw, A411011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 m to 40.0 m.

The method includes slab-heating a steel slab to a temperature of higher than a ?-phase precipitation temperature and 1380? C. or lower, subjecting the steel slab to rough rolling including at least two passes of rolling at a predetermined temperature with an introduced sheet thickness true strain ?.sub.t of 0.50 or more and to finish rolling with a rolling finish temperature of 900? C. or higher to obtain a hot-rolled sheet, cooling the sheet for 1 second or longer at a cooling rate of 70? C./s or higher within 2 seconds after finish rolling, coiling the sheet at a coiling temperature of 600? C. or lower, performing hot-rolled sheet annealing for soaking at a predetermined soaking temperature, and then performing cold rolling, primary recrystallization annealing, and secondary recrystallization annealing.

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.

Provided is a grain-oriented electrical steel sheet that has excellent magnetic properties and can be manufactured by secondary recrystallization orientation control using coil annealing with high productivity. A grain-oriented electrical steel sheet comprises a specific chemical composition, wherein an average value of a deviation angle (.sup.2+.sup.2).sup.1/2 calculated from a deviation angle from ideal Goss orientation around an ND rotation axis and a deviation angle from ideal Goss orientation around a TD rotation axis is 5.0 or less, and an area ratio R.sub. of crystal grains with 0.50 is 20% or less.

The method includes slab-heating a steel slab to a temperature of higher than a ?-phase precipitation temperature and 1380? C. or lower, subjecting the steel slab to rough rolling including at least two passes of rolling at a predetermined temperature with an introduced sheet thickness true strain ?.sub.t of 0.50 or more and to finish rolling with a rolling finish temperature of 900? C. or higher to obtain a hot-rolled sheet, cooling the sheet for 1 second or longer at a cooling rate of 70? C./s or higher within 2 seconds after finish rolling, coiling the sheet at a coiling temperature of 600? C. or lower, performing hot-rolled sheet annealing for soaking at a predetermined soaking temperature, and then performing cold rolling, primary recrystallization annealing, and secondary recrystallization annealing.

A method for forming a film on a surface of a steel sheet includes applying a treatment solution for forming a film containing a fibrous material to the surface of the steel sheet by using a coater under a condition in which a difference between a speed of the steel sheet and a speed of an applicator of the coater is 1.0 m/min or more, inclining the surface of the steel sheet, to which the treatment solution for forming a film has been applied, at an angle of 10? or more with respect to a horizontal plane until drying is started, and thereafter drying the steel sheet.

By optimizing equipment and processing, magnetic domain miniaturization efficiency can be increased, workability can be improved, and processing ability can be increased through same. Provided is a method for miniaturizing the magnetic domains of a directional electric steel plate, the method comprising: a steel plate supporting roll position adjusting step of controlling the vertical direction position of a steel plate while supporting the steel plate progressing along a production line; and a laser emitting step of melting the steel plate by emitting a laser beam to form grooves on the surface of the steel plate, wherein the laser emitting step includes an angle changing step of changing an emitting line angle of the laser beam with respect to a width direction of the steel plate while an optical system emitting the laser beam onto the steel plate is rotated with respect to the steel plate, and a focal distance maintaining step of changing a tilt of the steel plate supporting roll which supports the steel plate according to a change in focal distance of the laser beam in the width direction of the steel plate.

A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention contains, by wt %, 0.005% or less (excluding 0%) of C, 1.2 to 2.7% of Si, 0.4 to 2.0% of Mn, 0.005% or less (excluding 0%) of S, 0.3% or less (excluding 0%) of Al, 0.005% or less (excluding 0%) of N, 0.005% or less (excluding 0%) of Ti, and a balance of Fe and inevitable impurities, wherein the non-oriented electrical steel sheet satisfies the following Expression 1, and a volume fraction of grains having an angle of 15? or less between a {112} plane and a rolling plane in the steel sheet is 40 to 60%.

[00001]$\begin{array}{cc}0.3?\left(\left[\mathrm{Si}\right]+\left[\mathrm{Al}\right]-1.5\right)/\left[\mathrm{Mn}\right]?0.85& \left[\mathrm{Expression}1\right]\end{array}$ (In Expression 1, [Si], [Al], and [Mn] represent contents (wt %) of Si, Al, and Mn, respectively.)

An electrical steel sheet (300) is formed such that centerlines of four magnetic poles (salient poles) of a rotor core (111) coincide with a direction of easy magnetization (ED1) or (ED2). In addition, the electrical steel sheets (300) are laminated such that the directions of easy magnetization (ED1) and (ED2) are aligned.