Patent ID: 11939641
Assignee: NIPPON STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A grain oriented electrical steel sheet comprising, as a chemical composition, by mass %,
2.0 to 7.0% of Si,
0 to 0.030% of Nb,
0 to 0.030% of V,
0 to 0.030% of Mo,
0 to 0.030% of Ta,
0 to 0.030% of W,
0 to 0.0050% of C,
0 to 1.0% of Mn,
0 to 0.0150% of S,
0 to 0.0150% of Se,
0 to 0.0650% of Al,
0 to 0.0050% of N,
0 to 0.40% of Cu,
0 to 0.010% of Bi,
0 to 0.080% of B,
0 to 0.50% of P,
0 to 0.0150% of Ti,
0 to 0.10% of Sn,
0 to 0.10% of Sb,
0 to 0.30% of Cr,
0 to 1.0% of Ni, and
a balance consisting of Fe and impurities, and
comprising a texture aligned with Goss orientation,
wherein
when α1 and α2 represent deviation angles from an ideal Goss orientation based on a rotation axis parallel to a normal direction Z, measured at one measurement point and measured at an other measurement point, respectively, wherein the one measurement point and the other measurement point are adjacent on a sheet surface of the grain oriented electrical steel sheet with an interval of 1 mm among at least 500 measurement points;
β1 and β2 represent deviation angles from the ideal Goss orientation based on a rotation axis parallel to a transverse direction C, measured at the one measurement point and at the other measurement point, respectively; and
γ1 and γ2 represent deviation angles from the ideal Goss orientation based on a rotation axis parallel to a rolling direction L, measured at the one measurement point and at the other measurement point, respectively,
a boundary condition BA is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥0.5°, and
a boundary condition BB is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥2.0°,
wherein a boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included and a value of dividing a number of the grain boundary which satisfies the boundary condition BA by a number of the grain boundary which satisfies the boundary condition BB is 1.15 or more.