Hot working method for producing grain oriented silicon...

Details Hot working method for producing grain oriented silicon... Hot working method for producing grain oriented silicon...

C - Chemistry, Metallurgy

21

D

148/25, 148/8

C21D 8/12 (2006.01) C21D 9/00 (2006.01) C23C 8/14 (2006.01) H01F 1/147 (2006.01)

Patent

CA 2005027

ABSTRACT OF THE DISCLOSURE Oriented silicon steel is heated in a slab furnace at temperatures above 1260°C prior to hot rolling. The slab surfaces in the furnace are exposed to molten slag, variable atmosphere conditions and refractory interaction from the hearth. The slab surface prior to hot rolling has a major importance for cold rolling and the quality of the glass film. A rapid oxidation treatment of the slab just prior to the scale breaker or first rolling stand corrects a silicon-free iron layer condition which causes streaks in the glass film. The oxidation treatment blows gas having at least 30% oxygen for a sufficient time and velocity to provide a surface which will develop a continuous fayalite layer in subsequent processing and provide for the formationof a continuous glassy film.

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