Grain-oriented electrical steel sheet and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10988822-B2
Application number	US-201615549742-A
Country	US
Kind code	B2
Filing date	Feb 12, 2016
Priority date	Feb 13, 2015
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

In a grain-oriented electrical steel sheet including: a steel substrate; a forsterite base film; and an insulating coating, critical damage shear stress τ between the forsterite base film and the steel substrate is 50 MPa or more and 200 MPa or less. Thus, a grain-oriented electrical steel sheet having excellent insulation property, stacking factor, and magnetic property is provided without coating damage even when magnetic domain refining treatment by thermal strain is performed.

First claim

The invention claimed is:

1. A grain-oriented electrical steel sheet comprising:
a steel substrate;
a forsterite base film; and
an insulating coating,
wherein critical damage shear stress τ between the forsterite base film and the steel substrate is 50 MPa or more and 200 MPa or less, the critical damage shear stress τ being measured in accordance with JIS R 3255,
wherein the grain-oriented electrical steel sheet has a non-heat resistant magnetic domain refining region,
wherein a heat-affected width w is 50 μm or more and (2τ+150) μm or less, the heat-affected width w being a width of a thermal strain portion in the non-heat resistant magnetic domain refining region and the τ is a value expressed in MPa, and
wherein the grain-oriented electrical steel sheet has a coating damaged part area ratio of 10% or less.

2. The grain-oriented electrical steel sheet according to claim 1 ,
wherein the critical damage shear stress τ between the base film and the steel substrate is 100 MPa or more and 200 MPa or less.

3. The grain-oriented electrical steel sheet according to claim 1 ,
wherein the critical damage shear stress τ between the base film and the steel substrate is 100 MPa or more and 200 MPa or less, and
wherein the grain-oriented electrical steel sheet has no coating damaged part.

Assignees

• Jfe Steel Corp

Inventors

• Uesaka Masanori
• Watanabe Makoto
• Takajo Shigehiro

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• H01F1/16

  in the form of sheets (H01F1/147 takes precedence) · CPC title

• C22C38/04

  containing manganese · CPC title

• C21D8/12 Primary

  during manufacturing of articles with special electromagnetic properties · CPC title

• C21D8/1283 Primary

  Application of a separating or insulating coating · CPC title