| 摘要 |
The material includes a great amount of Si, 3.1 to 4.5%. As an inhibitor, a mixture of a small amount of A and a trace of S or Se is employed, together with Mo. Moreover, a slab heating treatment is carried out at a temperature higher than 1,279<o> C until the scale loss at the time of heating becomes 2.7 to 5.0%, whereby the inhibitor is satisfactorily dissociated and formed into a solid solution. By so doing, the effect of suppressing the growth of primary recrystallization grains at the time of secondary recrystallization annealing is remarkably intensified, and the development of the secondary recrystallization grains of the [110] <001> orientation is facilitated. Thus, a secondary recrystallization texture is formed which is intensely oriented in the [110] <001> direction, thereby attaining increased magnetic flux density and reduced iron loss. Also, the cracking in the hot rolling step after the heating treatment is effectively prevented, thereby realizing improvements in the surface and magnetic properties. |
