| 摘要 |
PURPOSE:To provide a manufacturing method of an electromagnetic steel sheet having little anisotropy in magnetic property. CONSTITUTION:A steel slab containing <=0.010% C, 1.5 to 4.0% Si, 1.0 to 4.0% Mn, <=0.01% S, 0.003 to 0.030% Al and 0.001 to 0.010% N is treated by the following ways (1) to (4) in which the electromagnetic steel sheet with low iron loss and excellent balance between magnetic properties in the rolling direction and in the direction orthogonally crossing with the rolling direction is manufactured. (1) Hot rolling process. (2) Cold rolling process continuously following the hot rolling or after annealing following the hot rolling. (3) First crystallizing process by continuous annealing. (4) Second crystallizing process by keeping for 4 to 100 hours in a temp. range of 800 to 1000 deg.C in an H2 atmosphere. Thus, the electromagnetic steel sheet having iron loss anisotropy of <=2.0 and low iron loss in both of the rolling direction and the direction orthogonally crossing with the rolling direction is obtained. |
