| 摘要 |
PROBLEM TO BE SOLVED: To stably manufacture the non-oriented silicon steel sheet having low iron loss by hot rolling the slab having the specified composition consisting of C, P, N, Si, Mn, sol. Al, and S, and the balance Fe under the prescribed condition. SOLUTION: The slab has the composition consisting of, by weight, 0-0.005% P, 0-0.2% N, 0-0.005% N, 1.5-4.0% Si, 0.1-1.5% Mn, 0-0.004% or 0.1-1.0% sol. Al, 0-0.02% S, and the balance substantially Fe. After the slab is heated to 950-1150 deg.C, the rough-rolling of 70-90 % in draft is achieved. Then, the rough- rolled slab is heated to the higher temperature than the rough-rolling completion temperature by >=20 deg.C, and after the temperature rises to <= the slab heating temperature, the finish rolling is achieved. The hot rolled sheet need not be specially annealed, and the finish annealing is achieved after the prescribed thickness is obtained through the cold rolling. |
