Grain-oriented electrical steel sheet excellent in magnetic properties and method for producing the same
US7045025B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2003 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Apr 17, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1294
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A low core loss grain-oriented electrical steel sheet that does not have a significant deterioration in a magnetic flux density and a decrease of a space factor, and which may withstand stress-relieving annealing is provided. Melted and re-solidified layers can be formed on either or both of the surfaces of the grain-oriented electrical steel sheet that extend in a direction that is perpendicular to the rolling direction (e.g., in the direction of the width thereof), at a cyclic interval of not less than approximately 2 mm to less than approximately 5 mm in the rolling direction. The melted and re-solidified layers may be provided on each surface of the grain-oriented electrical steel sheet, and can have an aspect ratio that is a ratio of the depth to the width of the melted and re-solidified layer of not less than approximately 0.20 and a depth of not less than approximately 15 μm. In addition, the melted and re-solidified layers can be formed by using a laser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.