US 11,990,261 B2
Grain-oriented electrical steel sheet
Yoshihisa Ichihara, Tokyo (JP); Takeshi Omura, Tokyo (JP); Hirotaka Inoue, Tokyo (JP); and Kunihiro Senda, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/998,356
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Mar. 4, 2021, PCT No. PCT/JP2021/008542
§ 371(c)(1), (2) Date Nov. 10, 2022,
PCT Pub. No. WO2021/250953, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 2020-100436 (JP), filed on Jun. 9, 2020.
Prior Publication US 2023/0178276 A1, Jun. 8, 2023
Int. Cl. H01F 1/16 (2006.01); B32B 3/00 (2006.01); B32B 3/10 (2006.01); B32B 3/26 (2006.01); B32B 3/30 (2006.01); C21D 8/12 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C25F 3/06 (2006.01); H01F 1/147 (2006.01); C21D 7/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/60 (2006.01)
CPC H01F 1/16 (2013.01) [B32B 3/00 (2013.01); B32B 3/10 (2013.01); B32B 3/26 (2013.01); B32B 3/263 (2013.01); B32B 3/30 (2013.01); C21D 8/1277 (2013.01); C21D 8/1294 (2013.01); C21D 9/46 (2013.01); C25F 3/06 (2013.01); H01F 1/147 (2013.01); C21D 7/02 (2013.01); C21D 2201/05 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/60 (2013.01); C22C 2202/02 (2013.01); Y10T 428/12972 (2015.01); Y10T 428/12993 (2015.01)] 8 Claims
OG exemplary drawing
 
1. A grain-oriented electrical steel sheet, comprising a plurality of linear grooves extending in a direction crossing a rolling direction of the steel sheet on a surface of the steel sheet, wherein
a surface of the steel sheet between the linear grooves has a recessed defect that is recessed from the surface,
a volume fraction of the recessed defect in the steel sheet is 0.0025 vol % or more and 0.01 vol % or less of a steel sheet without the recessed defect, and
discontinuous portions that disrupt the extension of the linear grooves are provided at a frequency of 30 or more and 200 or less per square meter of the steel sheet.