Grain-oriented electrical steel sheet having stable magnetic properties resistant to stress-relief annealing, and method and apparatus for producing the same
US4750949A · kind A · utility
26Cited by
2References
11Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 12, 1985 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | Nov 12, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A grain-oriented electrical steel sheet having a low watt loss after stress relief annealing is proposed. The steel sheet, which is final texture annealed, and to which tension is imparted, has a number of recessed parts on the surface thereof forming indentations into the steel sheet body having a depth in the range of from 0.01 to 0.1 mm. The recessed parts are filled with a composition having a coefficient of thermal expansion smaller than that of the steel sheet body. From the recessed parts and the composition the magnetic domains are subdivided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.