| 摘要 |
PURPOSE:To manufacture efficiently silicon steel sheets having favorable magnetic characteristics by hot rolling silicon steel blanks and cold rolling the resulting two steel strips in an overlapped state after reducing the surface roughness of the contacting surfaces of the strips. CONSTITUTION:Silicon steel blanks contg. <=40wt% Si are hot rolled, and the resulting steel strips are cold rolled once to provide the final thickness. The steel strips may be cold rolled twice or more while carrying out process annealing between the cold rolling stages. In at least one of the cold rolling stages, the two steel strips are cold rolled in an overlapped state, and the average surface roughness Ra of at least the contacting surfaces of the strips is reduced to <=0.8mum by smoothening before the cold rolling. By the smoothening, silicon steel sheets having favorable characteristics can be obtd. |
