| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacture of a nonoriented silicon steel sheet advantageous to the miniaturization of iron core and having high magnetic flux density. SOLUTION: This nonoriented silicon steel sheet can be produced by hot- rolling a steel having a composition consisting of, by weight, >0.10-4.00% Si, 0.1-1.0% Mn, 1.0-2.00% Al, <=0.0050% C, <=0.0050% N, <=0.0050% S, and the balance Fe with inevitable impurities, applying a single cold rolling stage to the resultant hot rolled plate, and then applying finish annealing or applying skin pass rolling after finish annealing to the resultant cold rolled sheet. In this case, at the time of finish hot rolling, finish rolling is carried out under the conditions of >=150s<-1> strain rate at least one pass and >=1.5kgf/mm<2> tension between at least a set of stands, and moreover, cold rolling rate is regulated to <=75%. Further, roughed sheet bars are joined by hot rolling and subjected, continuously, to finish hot rolling. |
