Method for treating an electromagnetic steel sheet and an electromagnetic steel sheet having marks of laser-beam irradiation on its surface
US4363677A · kind A · utility
28Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1981 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | Jan 22, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12924
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process of providing electromagnetic steel strips or sheet with excellent magnetic properties. The process comprises the steps of: PA0 irradiating with a laser-beam the surface of an electromagnetic steel sheet which has been finally annealed, thereby locally forming marks of the laser-beam irradiation on the surface of the steel, and; PA0 subsequently, subjecting the steel sheet to the formation of an insulating film on the sheet surface at a temperature of the sheet not exceeding 600.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.