Method for making non-oriented magnetic steel sheet

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials

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148111, H01F 114

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056371578

ABSTRACT:
This invention is directed to a method of producing a non-oriented magnetic steel sheet involving a series of processes including performing hot rolling process on a steel slab containing no more than about 0.01 wt % C, no more than about 4.0 wt % Si, no more than about 1.5 wt % Mn, no more than about 1.5 wt % Al, no more than about 0.2 wt % P, and no more than about 0.01 wt % S, performing thereto at least one cold rolling process including an optional intermediate annealing process, and then performing a finishing annealing process. The hot rolling process further includes a step which reduces thermal irregularity formed during slab heating; this step involves maintaining a sheet bar, obtained by rough-rolling of the steel slab, at a temperature ranging from about 850.degree. to 150.degree. C. The hot rolling process also includes a step which promotes the growth of fine precipitated particles by applying strain to the sheet bar. Magnetic steel sheet thusly obtained possess uniform magnetic properties and thickness in the coil.

REFERENCES:
patent: 3188250 (1965-06-01), Holbein et al.
patent: 5164024 (1992-11-01), Nishimoto et al.
patent: 5169457 (1992-12-01), Nishimoto et al.
patent: 5186763 (1993-02-01), Kubota et al.

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