| 摘要 |
A method for producing an oriented electromagnetic steel sheet in which a steel slab containing, by mass%, 0.001 to 0.10% of C, 1.0 to 5.0% of Si, 0.01 to 1.0% of Mn, a total of 0.01 to 0.05% S and /or Se, 0.003 to 0.050% of soluble Al, and 0.001 to 0.020% of N, is hot-rolled, cold-rolled, subjected to primary recrystallization annealing, coated with a separation agent for annealing, and subjected to a final finishing annealing. During the primary recrystallization annealing, the speed (S1) of the temperature increase between 500 to 600°C is controlled so as to be equal to or greater than 100°C/s, the speed (S2) of the temperature increase between 600 to 700°C is controlled so as to be in the range from 30°C/s to 0.6 × S1, and MgO in which the expected value (mu(A)) of the citric acid activity distribution is 3.5 to 3.8 and the cumulative frequency (F) for the activity (A) being equal to or greater than 4.0 is 25 to 45% is used as the principal component of the separation agent for annealing. The resultant oriented electromagnetic steel sheet is free from cracking or defects due to twinning deformation, and is free from degradation of magnetic characteristics. |
