Hot working method for producing grain oriented silicon steel wi

Details Hot working method for producing grain oriented silicon steel wi Hot working method for producing grain oriented silicon steel wi

1989-01-19

1990-02-06

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, 148113, H01F 104

Patent

active

048986283

ABSTRACT:
Oriented silicon steel is heated in a slab furnace at temperatures above 1260.degree. 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 treatement 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 formation of a continuous glass film.

REFERENCES:
patent: 3393434 (1968-07-01), Ungerer
patent: 4088513 (1978-05-01), Nakazawa et al.
patent: 4330348 (1982-05-01), Nagana

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