| 摘要 |
PURPOSE:To add the specified elements for the treatment to secure the cooling speed in the gamma treatment of nonorientd silicon steel having transformation and for the prevention of nitriding in the atmosphere of gamma region annealing. CONSTITUTION:In the manufacturing process of the nonoriented silicon steel containing <=2.5% Si, <=1.0% Al and Si+Al:2.5%, the gamma treatment in the hot rolling, the gamma treatment to manufacture the steel strip by solidifying the molten steel by the moving and updating surface of a cooling body (where the cooling speed in gamma-alpha transformation <=50 deg.C/s), and the gamma treatment of the hot-rolled steel strip obtained by the hot rolling are excuted respectively, and at least one of Sn, Sb, P, Cr, Ge, Te, As, Ni, Cu and Se to be selected from 0.10-0.8% Sn, Sb, Ge, Te, As or Cu, or 0.02-0.15% P, As for Se, or 0.05-1.5% Cr or Ni is added in the stage of the molten steel for each case. Addition of the elements prevents the nitriding in the gamma treatment, the recrystallization and the grain growth in the finish annealing is fully achieved, and extremely excellent flux density and core loss are obtained. |
