Process for preparation of grain-oriented electrical steel...

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

C - Chemistry, Metallurgy

21

D

148/8

C21D 8/12 (2006.01)

Patent

CA 1320108

- 21 - PROCESS FOR PREPARATION OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET HAVING EXCELLENT MAGNETIC AND FILM CHARACTERISTICS ABSTRACT OF THE DISCLOSURE 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 to 900°C in an atmosphere having an NH3 gas concentration of at least 1000 ppm, while running the strip.

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