Kawasaki Steel Corporation

Ujihiro Nishike

Shigeko Sujita

Yasuhiro Kobayashi

Hirotake Ishitobi

Tsuneo Nagamine

Tikara Kami

A grain oriented silicon steel sheet having a low iron loss and not causing degradation of properties even through strain relief annealing is produced by applying ultrasonic vibrations to the surface of the sheet after secondary recrystallization annealing.

Method for producing low iron loss grain oriented silicon steel sheets

A silicon-containing steel sheet having a low iron loss has such a crystal structure that crystal grains having an inclination angle of {110} face of not more than 10.degree. with respect to the sheet surface are included in an amount of not less than 80 vol % and exhibit a graining surface pattern in which boundaries of these crystal grains form stepwise difference or groove of not less than 0.4 .mu.m as a maximum height. This sheet is produced by subjecting a grain oriented silicon steel sheet after final annealing to a magnetically smoothening treatment by electrolysis in an squeous solution containing at least one of water soluble halides.

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Chiba, Japan

Ujihiro Nishike