| 摘要 |
PURPOSE:To produce a nonoriented silicon steel sheet having high magnetic flux density and low iron loss by incorporating small amounts of Sn and Cu simultaneously into a steel and controlling the finishing temp. of hot rolling. CONSTITUTION:A steel has a composition consisting of, by weight, <=0.010% C, 0.1-2.0% Si, 0.1-1.5% Mn, 0.1-1.0% Al, 0.02-0.20% Sn, 0.1-1.0% Cu, and the balance Fe with inevitable impurities. The hot rolling of this steel is finished at a temp. in the range between (Ar3 point - 20 deg.C) and (Ar3 point + 50 deg.C). Then, the resulting plate is subjected to hot rolled plate annealing at a temp. not higher than the Ac1 point or to self-annealing. Subsequently, the plate is cold-rolled once or is cold-rolled two or more times while process-annealed between the cold rolling stages, followed by continuous annealing. Further, skin pass rolling is carried out at 2-12% reduction of area, if necessary. By this method, the nonoriented silicon steel sheet having high magnetic flux density and reduced in iron loss can be obtained. |
