PURPOSE: To produce a hot rolled plate for silicon steel sheet where recrystallization and grain growth are sufficiently completed by subjecting a slab for silicon steel sheet containing specific percentages of C, Si, and Al to hot finishing and to heating and holding at respectively specified temps., performing cooling, and then coiling the resulting plate at specific temp.
CONSTITUTION: At the time of producing a hot rolled plate by hot-rolling a slab for silicon steel sheet containing, by weight, ≤0.005% C, ≤4.0% Si, and ≤1.0% Al, hot finishing temp. is regulated to 800-950°C, and the resulting plate is heated and held, directly after hot finish rolling, at a temp. higher by ≥50°C than the hot finishing temp. for 1-10sec, cooled, and coiled at ≤650°C. By this method, a silicon steel sheet having uniform and superior magnetic properties can easily be obtained with certainty under high economical efficiency.
NAMITA YOSHIHARU
OKANO YOICHIRO
TSUKATANI ICHIRO
KASE TOMOHIRO
