Production method of high-grade non-oriented silicon steel strip

Abstract

The present invention discloses a high-standard non-oriented silicon steel and a method for producing the same, whose chemical composition, in mass percent, includes C: 0.002-0.004%, S≦0.003%, Si: 1.4-1.7%, Mn: 0.7-0.95%, P≦0.03%, and Sn: 0.015-0.035%, and the ratio satisfies 11×([Si]-1.4%)=14×([Mn]-0.7%). In the method for producing non-oriented silicon steel, the heating temperature of the continuously cast slab is 1120-1150°C, the temperature of the final rolling in finish rolling is 890±15°C, the reduction in the final pass of finish rolling is ≥ 30% and the total reduction in the final two passes of finish rolling is ≥ 50%, the coiling temperature is 650±20°C, and normalizing treatment before continuous pickling and cold rolling is not required. The obtained non-oriented silicon steel has high magnetic properties and is free from surface wavy defects, meeting the demand for low-cost, high-specification non-oriented silicon steel.

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