| 摘要 |
PROBLEM TO BE SOLVED: To reduce iron loss after finish annealing at a low cost by providing a specific composition consisting of C, Si, Mn, P, N, Al, S, Sb, Ti, and the balance essentially Fe. SOLUTION: This steel sheet has a composition consisting of, by weight, <=0.005% C, 1.7-4.0% Si, 0.05-1.0% Mn, <=0.2% P, <=0.005% (including 0%) N, 0.1-1.0% Al, $0O.01% (including 0%) S, 0.001-0.05% Sb, 0.001-0.01% Ti, and the balance essentially Fe. By combinedly adding Ti and Sb in particular among the above elements, precipitates are agglomerated, coalesced, and coarsened and grain growth characteristic is improved. As the result, iron loss is reduced. The steel sheet can be produced by the ordinary method of nonoriented silicon steel sheet production, on condition that respective contents of the component elements including Sb and Ti in the composition are within the above ranges, respectively. |
