Grain-oriented electrical steel sheet and manufacturing method thereof
US11697856B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2019 |
| Grant date | Jul 11, 2023 |
| Priority date | — |
| Expiry date | Feb 7, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2261/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A grain-oriented electrical steel sheet according to the present invention includes a base steel sheet having plural grooves on a surface and a glass film formed on the surface of the base steel sheet. In case of viewing region including grooves in cross section orthogonal to groove longitudinal direction, a straight line passing through peak point present on profile line of glass film and parallel to groove width direction orthogonal to sheet thickness direction in cross section is defined as reference line, a point present on boundary line between glass film and base steel sheet and present at lowest location in sheet thickness direction is defined as deepest point, and a point present on boundary line and present at the highest location in the sheet thickness direction in region having the deepest point in a center and having length of 2 μm in groove width direction is defined as shallowest point, a relationship between shortest distance A between reference line and deepest point and shortest distance B between reference line and shallowest point satisfies Expression (1). 0.1 μm≤A−B≤5.0 μm (1)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.