Abstract: Effect of different annealing temperatures on the hot-rolled plate of 1.45%Si non-oriented silicon steel was studied in order to guide the heat preservation process of the hot-rolled plate and provide a theoretical basis for its non-normalizing production. The results show that the microstructure of the hot-rolled plate has a large gradient along the thickness direction, and the surface layer, the subsurface layer and the center layer are equiaxed grains, deformed grains and fine equiaxed grains and deformed grains, respectively. With the increase of annealing temperature, the recrystallization ratio of hot-rolled plate gradually increases from 32.8% to 96.8%, and the microstructure of hot-rolled plate gradually uniform, the grain size of hot-rolled plate reaches 51.4 μm after annealing at 740 ℃ for 2 h, the γ texture and Goss texture in hot-rolled plate continue to decrease, and the λ texture gradually increases. Complete recrystallization can occur after annealing at a temperature higher than 740 ℃ for 2 h. In actual production, the hot-rolled coil crimp temperature (≥700 ℃) should be increased as much as possible, and the hot-rolled coil should be quickly stored in the slow cooling pit for insulation, so that complete recrystallization can occur as much as possible. Finally, after cold rolling and recrystallization annealing, the final product has excellent magnetic properties.

Key words: non-oriented silicon steel, annealing temperature, microstructure, texture