Method for producing a grain-oriented electrical steel sheet having a low watt-loss
US4770720A · kind A · utility
26Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Sep 5, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1294
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Grooves are formed on a finish-annealed electrical steel sheet by applying a mean load of from 90 to 220 kg/mm.sup.2 to the steel sheet, which is then heat treated at a temperature of 750.degree. C. or higher, and thereby fine crystal grains are generated at the strain-introduced sites of the steel sheet. The fine crystal grain reduces the watt-loss value. Such a watt-loss improving effect is not impaired even by stress-relief annealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.