Abstract: The textures of medium temperature reheated grain oriented silicon steel containing copper during decarburization annealing and secondary cold rolling were quantitatively analyzed by EBSD technique, and the evolution of textures and plastic deformation during different passes of secondary cold rolling was studied. The results showed that {111}〈112〉texture, {111}〈110〉 texture and {112}〈110〉 texture are the main texture components in decarburization annealing and secondary cold rolling. In the surface and subsurface layer, the volume fraction of {111}〈112〉 texture and {111}〈110〉 texture increases with the increase of cold rolling passes, while the volume fraction of {112}〈110〉 texture increases at first and then decreases with the increase of cold rolling passes. Different from other positions, the {112}〈110〉 texture occupies the highest volume fraction in the central layer, and when the cumulative deformation is higher than 58 %, it transforms to the {111}〈110〉 texture. The {001}〈110〉 texture increases after the first cold rolling, and then tends to be stable with the increase of cold rolling pass, but the texture volume fraction of the central layer is higher than that of other positions. With the increase of secondary cold rolling passes, the geometric dislocation density increases, the degree of plastic deformation increases, and the geometric dislocation density of the surface layer and the subsurface layer is higher than that of the central layer.

Key words: grain oriented silicon steel, texture, decarburization annealing, cold rolling