Abstract: In order to study the effect of annealing temperature on microstructure evolution and properties of 0.27 mm thick high-strength non-oriented electrical steel, the cold-rolled tested steel sheet was annealed at 800-960 ℃ for 3 min, and then the microstructure was analyzed by OM, the grain orientation and microtexture were analyzed by EBSD, the iron loss and magnetic induction strength were tested by magnetic equipment, and the mechanical properties were tested by universal tensile testing machine. The results show that complete recrystallization occurs and equiaxed ferrite is obtained in the cold rolled steels annealed at different temperatures for 3 min. With the increase of annealing temperature, the average grain size increases from 9.56 μm to 72.89 μm, and the volume fraction of {111} plane texture, which is unfavorable to magnetic properties, first increases and then decreases. The high frequency iron loss P_1.0/400 reduces from 28.09 W/kg to 16.02 W/kg, and the average value of magnetic induction intensity B₅₀₀₀ is in the range of 1.63-1.64 T. With the increase of annealing temperature from 800 ℃ to 960 ℃, the grain size is increased and the strengthening effect of grain refinement is weakened, the yield strength reduces from 510 MPa to 437 MPa, and the tensile strength decreases from 609 MPa to 531 MPa.

Key words: non-oriented electrical steel, texture, grain size, magnetic properties, mechanical properties