METHOD FOR MANUFACTURING NON-ORIENTED SILICON STEEL WITH HIGH-MAGNETIC INDUCTION

摘要

A method for manufacturing non-oriented silicon steel with high-magnetic induction, includes the steps of: 1) smelting, casting smelting steel, secondary refining, and casting into a casting blank; wherein the non-oriented silicon steel composition by weigh percentage is composed of Si 0.1~1%, A1 0.005~1%, C 0.004% or less, Mn 0.10~1.50%, P 0.2% or less, S 0.005% or less, N 0.002% or less, Nb+V+Ti 0.006% or less, and balance iron; 2) heating to 1150~1200°C for hot rolling with the final rolling temperature of 830~900°C, and coiling at the temperature not less than 570°C; 3) cold rolling at a rolling reduction rate of 2-5% for leveling; 4) normalizing at the temperature not less than 950°C for 30~180 seconds; 5) acid pickling, and cold rolling at an accumulated rolling reduction rate of 70~80% after acid pickling; 6) annealing, heating to 800~1000°C in the speed of not less than 100 °C per second, keeping the temperature for 5~60 seconds, then slowly cooling to 600~750°C by 3~15 °C per second. According to the invention, on the premise of ensuring iron loss, the magnetic induction of non-oriented silicon steel can be improved at least 200 Gs.