Process for producing a grain-oriented electromagnetic steel she

Details Process for producing a grain-oriented electromagnetic steel she Process for producing a grain-oriented electromagnetic steel she

1982-08-24

1986-06-03

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148120, H01F 104

Patent

active

045927898

ABSTRACT:
In conventional processes for producing a grain-oriented electromagnetic steel strip or sheet, the carbon and silicon content of the starting material is such that .alpha.-.gamma. transformation takes place, said transformation formerly being belived to play an important role in, for example, the formation of AlN. Recently, attempts have been made to reduce the carbon content so as to simplify decarburization-annealing, but these attempts have not been successful.
In the present invention, (1) an extremely low carbon content (C.ltoreq.0.02%) and an extremely low sulfur content (S.ltoreq.0.015%), as well as a low heating temperature of the starting material, and (2) a temperature gradient of at least 2.degree. C. per centimeter, which is generated parallel to the sheet surface and under which the growth of secondary recrystallized grains is completed, are combined. As a result of such combination, the following advantages are attained: (1) secondary recrystallization is attained without .alpha.-.gamma. transformation taking place; (2) a high magnetic flux density is attained; (3) a continuous-casting machine can be directly combined with a continuous hot-rolling mill; (4) decarburization-annealing can be simplified; and (5) no molten slag is formed during heating of a steel slab.

REFERENCES:
patent: 3855019 (1974-12-01), Salsgiver et al.
patent: 3908432 (1975-09-01), Ichiyama et al.
patent: 3957546 (1976-05-01), Fiedler
patent: 3960616 (1976-06-01), Evans et al.
patent: 3990924 (1976-11-01), Matsumoto et al.
patent: 4437910 (1984-03-01), Nozawa et al.

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