| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonoriented silicon steel sheet commonly usable for a fullprocessed and a semiprocessed nonoriented steel sheet. SOLUTION: This nonoriented silicon steel sheet has a composition consisting of <=0.01% C, <=1.5% Si, <=1.0% Mn, <=0.01% S, <=0.02% sol.Al, 0.005-0.1% P, <=0.002% N, and the balance Fe with inevitable impurities and satisfying Al(%)×N(%)<1×10<-5> . In this case, by regulating the contents of sol.Al and N to <=0.02% and <=0.002%, respectively, and making the relation of Al(%)×N(%)<1×10<-5> be satisfied, the form of precipitation of AlN is changed and the precipitation of harmful AlN is inhibited and deterioration in magnetic properties can be prevented. Further, the necessity of skin pass rolling after finish annealing can be obviated, and this nonoriented silicon steel sheet can be commonly used for a fullprocessed and a semiprocessed nonoriented steel sheet. |
