Method for forming an insulating glass film on a grain-oriented silicon steel sheet having a high magnetic induction
US3930906A · kind A · utility
10Cited by
4References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 24, 1975 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Feb 24, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1283
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An insulating glass film having an excellent uniformity and a high adhesion to a grain-oriented silicon steel sheet having a high magnetic induction is formed by annealing a coil of a cold rolled silicon steel sheet having a final gauge in an annealing furnace under a non-oxidizing and non-reducing neutral inert gas, such as nitrogen or argon at a constant temperature keeping stage of 800.degree.-920.degree.C and then under dry hydrogen at a temperature of 1,000.degree.-1,200.degree.C in the final annealing stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.