Process for producing grain-oriented electrical steel sheet having improved magnetic and surface film properties
US5190597A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Nov 5, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1255
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing a grain-oriented electrical steel sheet having improved magnetic and surface film properties, comprising: using an electrical silicon steel slab containins S in an extremely small amount of 0.012 wt % or less and Mn in a limited range of 0.08 to 0.45 wt %; heating the slab to a relatively low temperature of not higher than 1200.degree. C.; hot-rolling the slab to form a hot-rolled strip; cold-rolling the strip to a thickness of a final product sheet; decarburization-annealing the cold-rolled strip; nitriding the strip while it is travelling; applying an annealing separator to the strip; and final texture-annealing the strip by heating the strip to a first temperature of from 800.degree. to 850.degree. C. in an atmosphere of (N.sub.2 +Ar).gtoreq.30 vol % with 25 vol % or more N.sub.2 and the remainder H.sub.2 and subsequently heating from the first temperature to above 1200.degree. C. in a conventional atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.