Effects of Initial Texture and Heat Treatment Process on the Texture Evolution and Magnetic Properties of Low Silicon Nonoriented Electrical Steel

Abstract

This research focuses on 0.74 wt% silicon Nonoriented silicon steel, obtaining different initial texture samples from hot-rolled sheets at sampling angles ranging from 0° to 75°. Furthermore, the evolution of microstructure and texture is observed throughout the entire process by combining five different annealing temperatures, including 780–980 °C. The results show that as the sampling angle increases, the components of the initial texture along the {110}<112>-{110}<001> line tend to decrease, in particular, the texture of Goss decreased from 1.4% to 0.3%, while those along the {100}<011>-{112}<111> line significantly increase once the angle exceeds 30°. Ultimately, among the samples from the same batch tested at θ = 30°, the performance is optimal, with iron loss P_15/50 reaching 4.57 W kg⁻¹, P_10/400 reaching 50.10 W kg⁻¹, and high-frequency magnetic flux B₅₀ at 1.76 T. Based on this, the optimal annealing process parameters are determined to be 930 °C for 10 min. Current reserch provides new insights and processing routes for texture control and magnetic performance optimization of Nonoriented silicon steel.