US 11,939,641 B2
Grain oriented electrical steel sheet
Shuichi Nakamura, Tokyo (JP); Yusuke Kawamura, Tokyo (JP); and Shota Morimoto, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/263,824
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Jul. 31, 2019, PCT No. PCT/JP2019/030059
§ 371(c)(1), (2) Date Jan. 27, 2021,
PCT Pub. No. WO2020/027215, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 2018-143898 (JP), filed on Jul. 31, 2018; application No. 2018-143900 (JP), filed on Jul. 31, 2018; application No. 2018-143901 (JP), filed on Jul. 31, 2018; application No. 2018-143902 (JP), filed on Jul. 31, 2018; application No. 2018-143904 (JP), filed on Jul. 31, 2018; and application No. 2018-143905 (JP), filed on Jul. 31, 2018.
Prior Publication US 2021/0355557 A1, Nov. 18, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C21D 9/46 (2006.01); C21D 1/76 (2006.01); C21D 3/04 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/12 (2006.01); H01F 1/18 (2006.01)
CPC C21D 9/46 (2013.01) [C21D 1/76 (2013.01); C21D 3/04 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1255 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/12 (2013.01); H01F 1/18 (2013.01); C21D 2201/05 (2013.01)] 36 Claims
OG exemplary drawing
 
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.