| 摘要 |
PURPOSE:To obtain a nondirectional silicon steel plate reducing the iron loss without deteriorating the mehanical properties by restricting the quantity of inclusions in a low C steel plate contg. specified amounts of Si, Al and Mn, and regulating the average grain size. CONSTITUTION:The quantity of inclusions of >=1mum size in a steel consisting of, by weight, <=0.005% C, 2.5-4.0% Si, 0.25-1.0% Al, 0.1-1.0% Mn and the balance essentially Fe is restricted to a value corresponding to <=120 pieces/mm.<2>. The average grain size which is affected by the relation between the Si and Al contents after annealing is regulated to 100+3.5X[Si%+Al%]<2>-170+5.0X [Si%+Al%]<2>. A nondirectional silicon steel plate of the regulated steel shows a small iron loss value corresponding to grade S7. |
