Procees for producing grain-oriented electrical steel sheet havi

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

1990-04-16

1991-08-13

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, H01F 104

Patent

active

050393596

ABSTRACT:
A process for producing a grain-oriented electrical steel sheet having a superior magnetic characteristic, comprising the steps of: hot-rolling a silicon steel slab comprising 0.021 to 0.100 wt % C, 2.5 to 4.5 wt % Si, one or more elements for forming inhibitors, and the balance consisting of Fe and unavoidable impurities, to form a hot-rolled sheet; coiling the hot-rolled sheet at a coiling temperature lower than 700.degree. C.; subsequently cold-rolling the hot-rolled sheet at a reduction of 80% or more, effected by a plurality of rolling passes, to a final product sheet thickness; holding the steel sheet at a temperature of from 50.degree. to 500.degree. C. for 1 minute or longer at least once at the stage between the rolling passes of the cold rolling; decarburization-annealing the cold-rolled sheet; and final-annealing the decarburization-annealed sheet.

REFERENCES:
patent: 4773948 (1988-09-01), Nakaoka et al.
patent: 4824493 (1989-04-01), Yoshitomi et al.

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