Process for producing grain-oriented electrical steel sheet havi

Details Process for producing grain-oriented electrical steel sheet havi Process for producing grain-oriented electrical steel sheet havi

1991-11-05

1993-03-02

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148113, H01F 104

Patent

active

051905973

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.

REFERENCES:
patent: 4938807 (1990-07-01), Takahashi et al.
patent: 5049205 (1991-09-01), Takahashi et al.

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