Low iron loss high strength non-oriented electromagnetic steel sheet and method for manufacturing same

摘要

Provided is a low iron loss high strength non-oriented electromagnetic steel sheet and a method for manufacturing the same. The method comprises hot-rolling a slab comprising 0.005 weight % or less of C, 4.0 weight % or less of Si, 0.1 weight % or less of P, 0.03 weight % or less of S, 0.1 to 2.0 weight % of Mn, 0.3 to 2.0 weight % of Al, 0.003 weight % or less of N, 0.005 weight % or less of Ti, the remainder being Fe and unavoidable impurities, cold-rolling the slab, and finally annealing the slab such that the fractional area of the non-recrystallization tissue at the cross sectional surface of the steel sheet is 50% or lower (not including 0%).

主权项

1. A method for manufacturing a non-grain-oriented electrical steel sheet having low core loss and high strength properties, the method comprising: hot-rolling a slab comprising 0.005 wt % or less of C, 4.0 wt % or less of Si, 0.1 wt % or less of P, 0.03 wt % or less of S, 0.1-2.0 wt % of Mn, 0.3-2.0 wt % of Al, 0.003 wt % or less of N, 0.005 wt % or less of Ti, and a balance of Fe and unavoidable impurities to produce a hot-rolled steel sheet;
cold-rolling the hot-rolled steel sheet to produce a cold-rolling steel sheet; and subjecting the cold-rolled steel sheet to final annealing so that the area fraction of non-recrystallized structures in the cross-section of the steel sheet is 50% or less (excluding 0%), wherein the final annealing is performed at a temperature of 720˜760° C.