Process for producing non-directional electrical steel sheets fr

Details Process for producing non-directional electrical steel sheets fr Process for producing non-directional electrical steel sheets fr

1977-07-27

1982-05-25

Spruill, R. L.

Metal founding

Process

Shaping liquid metal against a forming surface

164476, B22D 2702

Patent

active

043311962

ABSTRACT:
Improvements of a process for producing a non-directional electrical steel sheet free from ridging, which comprises making a molten steel into slabs by continuous casting, hot rolling the slab, cold rolling the hot rolled product into a final thickness by a single step, and subjecting the cold rolled product to decarburization annealing, said molten steel consisting essentially of not more than 0.02% C, 1.5 to 4.0% Si, not more than 1.0% Al, with the balance being Fe and unavoidable impurities, said hot rolling being done at a temperature in a range of from 900.degree. to 1100.degree. C. before a finishing rolling of the hot rolling, said improvements comprising stirring electromagnetically unsolidified molten steel in a zone where the molten steel is at a temperature not higher than the liquidus line and remains in thickness not less than 50% to whole cast thickness, so as to allow not less than 50% of the slab central zone corresponding to a central zone of the hot rolled product which does not recrystallize during the hot rolling to transit into an equi-axed structure.

REFERENCES:
patent: 2084336 (1937-06-01), Goss
patent: 2867557 (1959-01-01), Crede et al.
patent: 2963758 (1960-12-01), Pestel et al.
patent: 3952791 (1976-04-01), Ito et al.

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