Method of manufacturing grain oriented silicon steel sheets
US5318639A · kind A · utility
4Cited by
1References
10Claims
0Family size
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Key dates
| Filing date | Sep 24, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Sep 24, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1272
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Method of manufacturing a grain oriented silicon steel sheet. An annealing separating agent mainly composed of MgO is coated on a surface of a decarburized silicon steel sheet. The silicon steel sheet is subjected to secondary recrystallization annealing and then purification annealing. The annealing separating agent contains Ti oxide or a Ti compound which can be oxidized by heating. The purification annealing is conducted in steps. A non-oxidizing atmosphere having a high nitrogen concentration is present in one step. A hydrogen atmosphere having a low nitrogen concentration is present in a subsequent step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.