US 12,215,401 B2
Grain-oriented electrical steel sheet
Shinsuke Takatani, Tokyo (JP); Yoshihiro Arita, Tokyo (JP); Shunsuke Okumura, Tokyo (JP); and Shohji Nagano, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/422,048
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Jan. 16, 2020, PCT No. PCT/JP2020/001183
§ 371(c)(1), (2) Date Jul. 9, 2021,
PCT Pub. No. WO2020/149342, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-005475 (JP), filed on Jan. 16, 2019.
Prior Publication US 2022/0119906 A1, Apr. 21, 2022
Int. Cl. C22C 38/00 (2006.01); C21D 8/02 (2006.01); C21D 8/12 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/16 (2006.01); C22C 38/60 (2006.01)
CPC C21D 9/46 (2013.01) [C21D 8/0257 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/16 (2013.01); C22C 38/60 (2013.01); C21D 2201/05 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A grain-oriented electrical steel sheet comprising:
a base steel sheet;
an amorphous oxide layer formed on the base steel sheet; and
a tension-insulation coating formed on the amorphous oxide layer,
wherein the base steel sheet contains, as a chemical composition, by mass %,
C: 0.085% or less,
Si: 0.80 to 7.00%,
Mn: 1.50% or less,
acid-soluble Al: 0.065% or less,
S: 0.013% or less,
Cu: 0 to 0.80%,
N: 0 to 0.012%,
P: 0 to 0.50%,
Ni: 0 to 1.00%,
Sn: 0 to 0.30%, and
Sb: 0 to 0.30%,
a remainder is Fe and an impurity,
a surface glossiness Gs20(A) in a direction parallel to a rolling direction is 2.0 or more and less than 30.0, and a surface glossiness Gs20(B) in a direction perpendicular to the rolling direction is 2.0 or more and less than 30.0,
wherein the amorphous oxide layer is an external oxidation-type layer in which some of an amorphous oxide intrudes into an interface between the steel sheet and the amorphous oxide and an aspect ratio is less than 1.2, and
wherein the aspect ratio is represented by a ratio between the length of the intrusion portion in a depth direction and a length of a bottom side of the intrusion portion.