Abstract: In order to explore the effect of annealing temperature on the microstructure and electromagnetic properties of a thin gauge 3.0 %Si non-oriented silicon steel, the effects of different annealing temperatures on electromagnetic properties, microstructure and texture of cold rolled 0.25 mm thick 3.0 %Si nonoriented silicon steel were simulated by means of a multi atmosphere continuous annealing furnace. The results showed that, the iron loss P1.5/50 and P1.5/400 gradually decreased as the annealing temperature increased from 850 ℃ to 975 ℃. When the annealing temperature exceeded 950 ℃, the iron loss P1.5/50 was about 1.47 W/kg, and when the annealing temperature exceeded 975 ℃, the iron loss P1.5/400 gradually increased. As the increase of annealing temperature, the increase of hard magnetize textures of {111}〈121〉, {111}〈110〉 etc. was faster than {001} texture, and the magnetic induction B50 was decreased. Considering the effect of annealing temperature on magnetic induction and iron loss, better electromagnetic properties can be obtained when the annealing temperature is 975 ℃, then the critical grain size is 125 μm. The optimum annealing temperature in industrial production is 950~975 ℃.

Key words: annealing temperature, non-oriented silicon steel, iron loss, magnetic induction, microstructure