PURPOSE: To stably manufacture the titled steel sheet having a plate shape after temper rolling, superior suitability to blanking and superior magnetic properties by hot rolling and cold rolling a silicon steel slab having a specified compsn. and by subjecting the cold rolled steel sheet to annealing, temper rolling and annealing under specified conditions.
CONSTITUTION: A silicon steel slab consisting of, by weight, ≤0.04% C, 0.1W4.0% Si, 0.1W2.0% Mn, ≤0.13% P, ≤0.05% S, ≤0.0100% N, 0.005W0.7% Al or ≤0.10% Al and B in 0.50W2.50 ratio of B/N and the balance Fe is hot rolled and the hot rolled steel sheet is cold rolled once or twice or more optionally after annealing. In case where the sheet is cold rolled twice or more, process annealing is carried out between the cold rolling stages. The cold rolled steel sheet is annealed at 600W1,100°C for 5secW3min and subjected to final cold rolling (temper rolling) at 2W15% draft. The sheet is then annealed at 650W900°C for 5secW3min so that work strain produced by the final cold rolling remains and flattens before blanking and strain relief annealing are carried out.
ISHIKAWA MASAZO
YOSHIDA TADAO
| JPS60255925A | 1985-12-17 |