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

1995-07-13

1997-01-28

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, C21D 812, C22C 3860

Patent

active

055974244

ABSTRACT:
The present invention relates to the provision of a process for producing a grain oriented electrical steel sheet having excellent magnetic properties, and comprises heating a slab comprising by weight 0.021 to 0.075% of C, 2.5 to 4.5% of Si, 0.010 to 0.060% of acid sol. Al, 0.0030 to 0.0130% of N, 0.014% or less of (S and 0.405 Se) and 0.05 to 0.8% of Mn with the balance being Fe and unavoidable impurities to a temperature below 1280.degree. C. to hot-roll the slab, subjecting the hot rolled sheet to cold rolling with a draft of 80% or more and subjecting decarburization annealing and then finish annealing, characterized in that, after the hot rolling, the hot strip is taken up at a temperature of 600.degree. C. or below and subjected to nitriding at any stage from after the hot rolling to the completion of the secondary recrystallization in the finish annealing without annealing of the hot rolled sheet.

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