| 摘要 |
PROBLEM TO BE SOLVED: To control slab heating temp. to the low one equal to that for common steel and to stably produce a steel sheet uniform in magnetic properties in the longitudinal direction without executing a nitriding stage by controlling the temp. difference between the temp. of the top part in the longitudinal direction and the temp. of the tail part in hot rolling for a slab as to the temp. in which a grain oriented silicon slab having a specified compsn. contg. C, Si, Mn, Al and N is subjected to hot rolling. SOLUTION: As to the production of this steel sheet, a grain oriented silicon slab is heated at <=1280 deg.C, is subjected to hot rolling and finish rolling, is thereafter subjected to hot rolled sheet annealing, is then subjected to cold rolling to form into a cold rolled sheet of final sheet thickness, is subjected to decarburizing annealing in wet hydrogen, is coated with a separation agent for annealing and is subjected to finish annealing. The temp. difference in the hot rolling is controlled to 50 to 150 deg.C. The compsn. of the slab is composed of the one contg. 0.02 to 0.15% C, 2.0 to 4.5% Si, 0.03 to 2.5% Mn, 0.005 to 0.050% Al, 0.003 to 0.013% N, <=0.02% S and/or Se, each 0.003 to 0.3% Sb, Sn, Ge and Bi, 0.003 to 0.3% Cu, 0.003 to 0.6% Cr or the like. |
