Process for manufacturing double oriented electrical steel sheet

Details Process for manufacturing double oriented electrical steel sheet Process for manufacturing double oriented electrical steel sheet

1992-11-10

1994-12-06

Dean, Richard O.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, 148113, C21D 812

Patent

active

053707486

ABSTRACT:
The present invention is a process for manufacturing a double oriented electrical steel sheet having a high magnetic flux density by carrying out a low temperature annealing for the secondary recrystallization by the use of AlN as inhibitor, characterized by hot-rolling a silicon steel slab comprising 1.8-4.8% by weight of Si, 0.008-0.048% by weight of acid soluble Al, 0.0028-0.0100% by weight of acid soluble Al, 0.0028-0.0100% by weight of total N, not more than 0.016% by weight of S and the balance being Fe and unavoidable impurities into a hot-rolled sheet, subjecting the sheet to cold-rolling at a reduction rate of 40-80%, subsequently subjecting the sheet to another cold-rolling at a reduction rate of 30-70% in the direction crossing the cold-rolled direction, annealing at 750.degree.-950.degree. C. in a wet hydrogen atmosphere for decarburization, and carrying out the final finishing annealing which comprises a stage for completing the secondary recrystallizing at a temperature of 920.degree.-1100.degree. C., followed by a stage for purification.

REFERENCES:
patent: 3640780 (1972-02-01), Stanley
patent: 4997493 (1991-03-01), Ushigami et al.

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