| 摘要 |
PURPOSE:To effectively prevent the nitriding and internal oxidation at the time of high temp. annealing in a steel sheet and to obtain good growability in its crystalline grains by adding a trace amt. of B to a steel contg. a relatively large amt. of Al as a base and furthermore adding Sb and Sn thereto. CONSTITUTION:The compsn. of a nonoriented silicon steel sheet is formed of, by weight, <=0.005% C, 1.5 to 3.5% Si, 0.1 to 1.5% Mn, <=0.005% S, 0.15 to 1.5% Al, <=0.005% N, 0.0005 to 0.0050% B, total 0.01 to 0.20% of one or two kinds of Sb and Sn and the balance Fe with inevitable impurities. By this compsn., nitriding and internal oxidation are not produced, so that its magnetic properties are made excellent. This nonoriented silicon steel sheet has low core loss and is suitable for an iron core of a large sized motor, a generator or the like. |
