The 0. 5 mm cold-rolled sheet of non-oriented silicon steel (/% : 0. 003C

0. 58Si

0. 20Mn

0. 010P

0. 002S

0. 25Al

0.003 ON) is cold-rolled by 2. 6 mm hot-rolled plate. The effect of recrystallized grain rate in sheet annealed at 390 ~ 820 °C on magnetic performance

tensile strength and hardness of the steel has been studied. Results show that before crystallization of steel (annealed at 390 ~ 480 °C)

the effect of annealing temperature on tensile strength and hardness of steel is minor; as recrystallized grain rate is ≥70% (annealed at 560 ~820)

decreasing annealing temperature is available to effectively increase tensile strength of steel while deterioration of steel's magnet

ic performance is no-obvious

but has no-effect on hardness of steel; as recrystallized grain rate is less than

<

70% (>480 ~

<

560℃)

with decreasing annealing temperature the steel's magnetic performance deteriorates sharply

but the tensile strength and hardness of steel increase obviously; as the steel anneals temperature at 560 °C with recrystallized grain rate 70%

the comprehensive properties of non-oriented silicon steel are best i. e. tensile strength R

m

470 MPa

HV1 hardness value 140

iron loss P

1.5/50

7. 5 W/kg and magnetic pole intensity 1. 70 T.