Influence Mechanism of Solidification Structure of Silicon Steel Castings on Hot Rolling Texture of Silicon Steel

Based on the solidification structure and hot rolling industrial experiments of Fe–3.2% Si oriented silicon steel continuous casting billets controlled by different electromagnetic stirring parameters in a steel plant, the effect of electromagnetic stirring parameters on the proportion of columnar crystal in the solidification structure of cast billet during continuous casting was characterized and analyzed using detection techniques such as optical microscopy (OM), X ray diffraction (XRD), and electron backscatter diffraction (EBSD). The influence mechanism of columnar crystal proportion on the texture of hot- rolled plate was explored. The results show that as the working current (3 Hz) of the electromagnetic stirrer decreases from 900 A to 200 A, the proportion of columnar crystal in the solidification structure of the casting billet increases from 40.1% to 68.5%, and the initial size of columnar crystal also increases. The surface layer of hot-rolled plate is mainly composed of copper type and brass texture, the secondary layer is mainly composed of Goss texture, and the central layer is mainly composed of α fiber texture extending along the rolling direction and weak γ fiber texture. With the increase of columnar grain rate in oriented silicon steel billet (40.1%–68.5%), the grain size in the recrystallization zone of hot-rolled plate increases, which is conducive to the preservation of the Goss texture in the subsurface layer. Increasing of the columnar grain rate of casting billet can reduce the degree of recrystallization in the central layer of the hot-rolled plate, and the deformation grain in the central layer become larger, which is not conducive to the formation of 114<481> textured grains.