PURPOSE: To produce a non-directional electrical steel sheet having an excellent electromagnetic characteristic by coiling a dead soft steel slab contg. Si, Al, Mn after hot rolling at a specific draft and coiling temp. then subjecting the same to cold rolling to a final thickness followed by finish annealing.
CONSTITUTION: A hot rolled sheet obtd. by hot rolling a slab contg., by weight %, ≤3.5% Si, ≤1.0% Al, 0.1W1.0% Mn, ≤0.02% C, and the balance substantially Fe is cold rolled once or twice without annealing to a final thickness. The rolled sheet is then subjected to finish annealing whereby a non-directinal electrical steel sheet is produced. The draft of the final finishing stand in a hot rolling stage is maintained at ≥20% and the coiling temp. of the hot rolled sheet at ≥700°C.
TAKEUCHI FUMIHIKO
MORITA KAZUMI
SADAYORI KATSUO
OBATA YOSHIO
