	US 12,217,889 B2
	Grain-oriented electrical steel sheet, and steel sheet serving as base sheet for grain-oriented electrical steel sheet
Shuichi Nakamura, Tokyo (JP); Yoshiyuki Ushigami, Tokyo (JP); and Hiroyasu Fujii, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/422,011
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Jan. 16, 2020, PCT No. PCT/JP2020/001145 § 371(c)(1), (2) Date Jul. 9, 2021, PCT Pub. No. WO2020/149324, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-005127 (JP), filed on Jan. 16, 2019.
Prior Publication US 2022/0102035 A1, Mar. 31, 2022
Int. Cl. H01F 1/147 (2006.01); C21D 6/00 (2006.01); C21D 8/12 (2006.01); C21D 9/46 (2006.01); C23C 22/78 (2006.01)

CPC H01F 1/147 (2013.01) [C21D 6/008 (2013.01); C21D 8/1233 (2013.01); C21D 8/1255 (2013.01); C21D 8/1272 (2013.01); C21D 8/1288 (2013.01); C21D 9/46 (2013.01); C23C 22/78 (2013.01); C21D 2201/05 (2013.01)]

15 Claims

1. A grain-oriented electrical steel sheet comprising an underlying steel sheet and a tension-insulation coating arranged on a surface of the underlying steel sheet,

wherein the underlying steel sheet obtained by removing the tension-insulation coating from the grain-oriented electrical steel sheet with an alkaline solution has a ten-point average roughness RzL in a rolling direction of 6.0 μm or less and an arithmetic average roughness RaC in the direction perpendicular to the rolling direction is less than 0.6 μm.