Process for producing a grain-oriented electrical steel sheet

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

1982-11-16

1986-01-07

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, H01F 104

Patent

active

045632260

ABSTRACT:
Conventionally, the silicon content of a grain-oriented electrical steel is approximately 3% at the maximum, since cold-rolling is difficult if the silicon content is high. Although conventional warm-rolling can occasionally mitigate the poor workability of a silicon steel having a high silicon content, it is impossible to control the texture of a cold-rolled strip and to completely prevent brittleness.
The present invention provides a novel rolling method in which, due to the heating of a steel strip prior to the carrying out of cold-rolling, a desirable texture can be formed and rupture of the cold-rolled strip can be prevented. The strip is heated to within a temperature range, in which both the minimum temperature which is at least 200.degree. C. and at least equal to T.sub.L (.degree.C.)=(x-3.0).sup.2 .times.100, x being the silicon content in weight percent, and the maximum temperature which temperature range being is not more than 400.degree. C. and not more than T.sub.H (.degree.C.)=-200.times.log (1/y), y being the strain rate (second.sup.-1) during the cold rolling are determined so as to satisfy the temperature of the first cold rolling pass.

REFERENCES:
patent: 3636579 (1972-01-01), Sakakura et al.
patent: 3843422 (1974-10-01), Henke
patent: 3933024 (1976-01-01), Matsumoto et al.
patent: 4014717 (1977-03-01), Barisoni et al.
patent: 4118255 (1978-10-01), Barisoni et al.
patent: 4302257 (1981-11-01), Matsumoto et al.

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