| 摘要 |
PROBLEM TO BE SOLVED: To propose a novel method for producing a grain-oriented electromagnetic steel sheet by which texture modification effect same as that of warm rolling can be attained.SOLUTION: Steel slab containing 0.01-0.10 mass% C, 2.0-4.5 mass% Si and 0.01-0.5 mass% Mn is hot-rolled to produce a hot-rolled plate, and the hot-rolled plate is annealed. Then, the hot-rolled plate is rolled at rolling-reduction ratio of 85% or more by one-time cold rolling, or it is rolled at rolling-reduction ratio of 80% or more by finish cold rolling comprising two or more times cold rolling with intermediate annealing, to produce a cold-rolled plate having a final plate thickness. The cold-rolled plate is subjected to primary recrystallize-annealing and secondary recrystallize-annealing to obtain the grain-oriented electromagnetic steel sheet. In the method for producing the grain-oriented electromagnetic steel sheet, low strain rate cold rolling of 150sor less in strain rate is conducted at least one pass or more in a step of the cold rolling in which a total rolling reduction is 50% or less. |
