| 摘要 |
In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002-0.10 mass%, Si: 2.0-8.0 mass%, and Mn: 0.005-1.0 mass%, subjecting the steel sheet to a hot band annealing as required, cold rolling to obtain a cold rolled sheet having a final sheet thickness, subjecting the steel sheet to primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to final annealing, rapid heating is performed at a rate of not less than 50°C/s in a region of 200-700°C in the heating process of the primary recrystallization annealing, and the steel sheet is held at any temperature of 250-600°C in the above region for 1-10 seconds, while a soaking process of the primary recrystallization annealing is controlled to a temperature range of 750-900°C, a time of 90-180 seconds and P H2O /P H2 in an atmosphere of 0.25-0.40, whereby a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value is obtained. |
