Grain-oriented electrical steel sheet causing low core loss and low magnetostriction
US10610964B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2015 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | Mar 3, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2201/05
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A grain-oriented electrical steel sheet includes: a base steel sheet; a primary film formed on a surface of the base steel sheet; and a tension insulation coating formed on a surface of the primary film, in which a magnetic domain control is performed by irradiating the tension insulation coating with a laser from above. When a strip-like sample having a length of 300 mm in a direction parallel to a rolling direction of the grain-oriented electrical steel sheet and a length of 60 mm in a direction parallel to a transverse direction is extracted from the grain-oriented electrical steel sheet, a range from a surface of the tension insulation coating to a depth position of 5 μm toward the base steel sheet side from an interface between the base steel sheet and the primary film is removed by pickling at least one surface of the sample, and a warpage amount of the sample is thereafter measured, the warpage amount satisfies predetermined conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.