| 摘要 |
PURPOSE:To manufacture a nonoriented electrical steel sheet having small iron loss after magnetic annealing, by specifying the ratio of the amt. of MnO to the total amt. of SiO2 MnO and Al2O3 in a nonoriented electrical steel sheet contg. specified percentages of C, Si, sol.Al, Mn, S, N and T.O. CONSTITUTION:When a nonoriented electrical steel sheet contg., by weight, <=0.015% C, 0.1-1.0% Si, 0.001-0.005% sol.Al, <=1.5% Mn, <=0.008% S, <=0.0050% N and <=0.02% T.O contains SiO2, MnO and Al2O3 as inclusions, the amt. of MnO is regulated to <=15% of the total amt. of SiO2, MnO and Al2O3. Thus, a nonoriented electrical steel sheet capable of attaining >=50mum average grain size after magnetic annealing and having small iron loss is easily obtd. at a low cost.
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