The cold-rolled non-oriented silicon steel (/%: 0.003C

2.35Si

0.22Mn

0.011P

0

002S

0. 36Al

0.003 0N) is cold-rolled to 0.35 mm sheet from 2. 3 mm hot-rolled plate normalized at 890 °C or 940 for 3 min. The effect of normalizing temperature and annealing process at 800 ~ 920 ℃ for 3 min on high frequency (400 Hz) magnetic properties and tensile strength of the steel has been tested and studied. Results show that with annealing at 830 ~ 920 °C the high frequency iron loss value P

10/400

is lowest

and with increasing annealing temperature the grain size increases and tensile strength of steel decreases; the optimum heat treatment process for the non-oriented steel is normalizing at 940 X. and annealing at 830 °C

in this case the tensile strength Rm

high frequency iron loss

P

10/400

and magnetic induction J

50

of steel are respectively 565 MPa

21. 5 W/kg and 1. 69 T.