Process for preparation of grain-oriented electrical steel sheet

Details Process for preparation of grain-oriented electrical steel sheet Process for preparation of grain-oriented electrical steel sheet

1989-04-19

1990-12-25

Andrews, Melvyn J.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148113, H01F 104

Patent

active

049799967

ABSTRACT:
The present invention relates to an improvement in the technique of heating an electrical steel slab at a low temperature. A grain-oriented electrical steel sheet having excellent magnetic characteristics and film characteristics is prepared by the process characterized in that a slab comprising, as main ingredients, up to 0.012% by weight of S, 0.010 to 0.060% by weight of acid-soluble Al, up to 0.010% by weight of N, 0.08 to 0.45% by weight of Mn, and 0.015 to 0.045% by weight is used as the starting slab, and after the decarburization annealing, the nitriding treatment is carried out at a temperature of 500.degree. to 900.degree. C. in an atmosphere having an NH.sub.3 gas concentration of at least 1000 ppm, while running the strip.

REFERENCES:
patent: 4473416 (1984-09-01), Kawamo et al.

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