| 摘要 |
PROBLEM TO BE SOLVED: To industrially stably produce a bidirectioanlly oriented silicon steel sheet having high magnetic flux density, in the method for producing a bidirectionally oriented silicon steel sheet in which [100]<;001>; orientation is developed by a cross cold rolling method, by suppressing the development of [110] suborientation deteriorating its magnetic properties. SOLUTION: In this method for producing a bidirectionally oriented silicon steel sheet, a silicon steel hot rolled sheet containing, by mass, 0.8 to 6.7% Si, <=0.085% C, 0.021 to 0.048% acid soluble Al and <=0.012% N, and the balance Fe with inevitable impurities is subjected to cold rolling at a draft of 40 to 80% in a direction identical with that in hot rolling, is further subjected to cold rolling at a draft of 30 to 70% in a direction crossing the above cold rolling direction and is then subjected to decaruburizing annealing, thereafter, a separation agent for annealing is applied thereto, and finish annealing for secondary recrystallization and purification is performed. In the crystal grain structure after the decarburizing annealing, the ratio of I[111]/I[211] is controlled to <=1, and moreover, the content of oxygen in an oxidized layer in the steel sheet is controlled to <=2.3 g/m2.
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