Abstract: The effects of different annealing temperatures on the microstructure, texture, mechanical and magnetic properties of high-grade non-oriented silicon steel were investigated. The results showed that within the 650-700 ℃ annealing temperature range, the samples underwent partial recrystallization, while complete recrystallization occurred at 750 ℃. As annealing temperature increased, grain growth continued and microstructural homogeneity improved. As annealing temperature increased, the content of deformation texture {111} initially decreased then increased, while favorable textures {100}+{110} content continuously rose, and the texture factor first increased then decreased.Increasing annealing temperature significantly enlarged grain size and reduced magnetic hysteresis losses, leading to notable decreases in both low-frequency iron loss P_1.5/50 and medium-high frequency iron loss P_1.0/400. The texture factor first increased then slightly decreased, causing magnetic induction B₅₀₀₀ to initially increase before modestly declining, peaking at 1.616 T at 725 ℃.Grain growth and dislocation density reduction with elevated annealing temperatures resulted in yield strength and tensile strength significant initial decreases and followed by gradual reductions. The optimal comprehensive performance was achieved at 750 ℃ annealing temperature, demonstrating balanced properties: B₅₀₀₀ of 1.613 T, P_1.5/50 of 6.62 W/kg, P_1.0/400 of 40.49 W/kg, yield strength of 496 MPa, and tensile strength of 598 MPa.

Key words: high-strength non-oriented silicon steel, annealing temperature, texture, magnetic properties, strength