| 摘要 |
PURPOSE:To obtain the title non-oriented magnetic steel sheet having low iron loss and excellent magnetic flux density by hot-rolling, annealing, cold-rolling, and then again annealing a steel having specified contents of C, Si, Mn, P, S, Al, N, and Fe under specified conditions. CONSTITUTION:A steel contg., by weight, 0.005-0.010% C, <=1.5% Si, 0.1-1.0% Mn, <=0.15% P, <=0.01% S, <=0.3% Al, <=0.007% N, the balance Fe, and inevitable impurity elements is refined into a slab. The slab is heated, hot-rolled, and then further hot-rolled in the temp. range from the median of the Ar3 and Ar1 to 750 deg.C. The obtained hot-rolled band steel is briefly annealed for <=5 min in the temp. range from Ar1 to (Ar3+50 deg.C), pickled, and then cold-rolled to a finishing thickness. The cold-rolled steel sheet is briefly decarburizing- annealed for 10sec to 5min in the temp. range below Ar3 to reduce the C content to <0.005%. By this method, a non-oriented magnetic steel sheet having low iron loss and excellent magnetic flux density is easily obtained. |
