| 摘要 |
PURPOSE: To produce a grain-oriented silicon steel sheet excellent in iron loss characteristic at a low cost. CONSTITUTION: The grain-oriented silicon steel sheet is produced by applying hot rolling to a slab having a composition consisting of, by weight ratio, 0.8-4.8% Si, 0.012-0.05% Al, <=0.01% N, and the balance Fe with inevitable impurities, further applying cold rolling to the resulting plate once or two or more times interposing process annealing between cold rollings, and then subjecting the resulting sheet to decarburizing annealing and to finish annealing. At this time, decarburizing annealing is executed in an atmospheric gas having a degree of oxidation of forming no Fe oxides and, after the application of alumina as a separation agent at annealing, finish annealing is executed. Then, the steel sheet is plated in linear or a dotlike state and a tension film is formed on it to increase the number of active magnetic domain walls of the grain oriented steel sheet, thereby, the iron loss can be reduced. |
