| 摘要 |
PROBLEM TO BE SOLVED: To obtain a silicon steel sheet having excellent magnetic properties of high magnetic flux density and low core loss by subjecting steel composed of a specified compsn. and having specified Q value to hot rolling at the temp. of >= the Ac1 point for a specified time, subjecting it to annealing and pickling and thereafter executing cold rolling and finish annealing. SOLUTION: This steel compsn. is composed of, by weight, 0.1 to 3.5% Si, 0.1 to 1.5% Mn, <=0.004% C, <=0.002% N, <=0.002% S, <=0.003% Ti, <=0.003% Nb, <=0.005% V, <=0.003% Zr, <=0.003% Ca, <=0.003% As, <=0.05% Cr, <=0.01% Sn, <=0.05% Cu, <=0.02% O, and the balance Fe, and Q value decided by the formula is controlled to <=-4.70. This steel slab having αγ transformation is hot-rolled in the temp. region of >= the Ac1 point for 10 sec to 5 min. Next, it is subjected to hot rolled sheet annealing and pickling, and cold rolling for one time and finish annealing are executed. If required, skinpass rolling is executed after that. The steel compsn. may moreover be incorporated with 1 to 2% Al. |
