| 摘要 |
A production method for grain-oriented electrical steel sheets in which a steel material which includes 0.002-0.10 mass% C, 2.0-8.0 mass% Si, and 0.005-1.0 mass% Mn is processed through hot rolling to form a hot-rolled sheet, after the hot-rolled sheet is annealed as necessary, the sheet is processed through cold rolling one time or two or more times with intermediate annealing therebetween to form a cold-rolled sheet of a final thickness, after primary recrystallization annealing combining decarburization annealing is performed, an annealing separator agent is applied to the surface of the steel sheet, and final annealing is performed, wherein a grain-oriented electrical steel sheet with low iron loss and minimal variations in the iron loss value is obtained by performing, two to six times, holding processing for maintaining at any temperature in the range of 250-600°C for 0.5-10 seconds when rapidly heating the temperature interval of 100-700°C at a rate of 50°C/s or higher in the heating step of the primary recrystallization annealing. |
