关键词: 无取向硅钢, 薄带连铸, 磁性能, 织构

Abstract: Based on twin-roll strip casting (TSC) technology, 0.35 mm and 0.20 mm high-grade non-oriented silicon steel strips were prepared by single-stage cold rolling and two-stage cold rolling, respectively. Microstructure and texture evolution of non-oriented silicon steel along preparation process were analyzed by means of EBSD, XRD and other detection methods. The results show that the as-cast strip prepared by TSC is mainly composed of coarse columnar crystals and has a strong λ-fiber texture with intensity of 4.76 and without γ-texture. After normalization, some equiaxed grains grow up, and the texture types does not change significantly. The texture of one-stage cold-rolled sheet mainly consisted of α-texture, and the recrystallization texture are mainly consisted of uniform γ-texture and λ-texture concentrated on {001}<120> with intensity of 5.41. The two-stage cold-rolled sheet is mainly composed of λ-texture and γ-texture with high density of shear bands. After recrystallization annealing, the microstructure is relatively coarse, and strong Cube texture is formed with intensity of 6.45. Due to the inheritance of initial favorable texture, the tested steel exhibites high magnetic induction and relatively high strength, and the iron loss value reaches the level of the conventional process. The B₅₀ reaches 1.77 T and P_1.0/400 is 20.78 W/kg in 0.35 mm annealed sheet. And the B₅₀ is 1.70 T, P_1.0/400 is 13.74 W/kg, which shows obvious advantage of low iron loss under high-frequency in 0.20 mm annealed sheet. The yield strength and the elongation of the two types of non-oriented silicon steel exceed 415 MPa and 15%, respectively.

Key words: non-oriented silicon steel, twin-roll strip casting, magnetic properties, texture