| 摘要 |
PROBLEM TO BE SOLVED: To obtain a silicon steel sheet excellent in blanking workability and magnetic characteristic by specifying component composition and surface Vickers hardness and further specifying the content of either Sb or Sn or both of them. SOLUTION: The component composition of the objective steel sheet is, by weight, <=0.01% C, 0.1-2.0% Si, 0.1-1.5% Mn, 0.5-2.5% Al, <=0.1% P and <=0.01% S, and satisfies the relation, Si+0.60Al>=0.80 and the surface Vickers hardness of <=160HV. In addition, the steel preferably contains 0.005-0.20% either Sb or Sn or the total of both of them. Further, it is desired that the sulfide inclusions in the steel sheet are mostly calcium-sulfide or calcium- oxysulfide and the oxygen surface density in the surface layer of ferrite after finish annealing is <=1.0g/m<2> . |
