Patent ID: 11898215
Assignee: NIPPON STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A grain-oriented electrical steel sheet having a base steel sheet, an intermediate layer having silicon oxide as a main component disposed to be in contact with the base steel sheet, and an insulation coating disposed to be in contact with the intermediate layer, the grain-oriented electrical steel sheet comprising:
a surface of the base steel sheet has a groove which extends in a direction intersecting a rolling direction of the base steel sheet, wherein
in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet, when a region between end portions of the groove is defined as a groove part,
an average thickness of the intermediate layer of the groove part is 0.5 times or more and 3.0 times or less an average thickness of the intermediate layer other than the groove part, and
an area ratio of voids in the insulation coating of the groove part is 15% or less.