Influence of α-region hot rolling on the rolling and recrystallization texture of cold rolled Ti-bearing extra low carbon steel sheets

Recent development in the automobile industry requires higher and higher formability of steel sheets. With the aim of improving the deep drawability, the influence of α-region hot rolling on the texture and γ-values of cold rolled Ti-containing extralow carbon steel sheets has been investigated. In the case of steel sheets hot rolled in the α-region, recrystallization textures in the midlayer of the cold rolled and annealed sheets show, regardless of the crystallized or nonrecrystallized state before cold rolling, a higher ND//〈111〉 intensity, whose development is favorable for deep drawability, than that of conventional cold rolled sheets. If hot rolled sheets have a deformed microstructure, ND//〈111〉 in the surface texture after final annealing does not develop and the main orientation is near {113} 〈110〉 ±15, while ND//〈111〉 in the surface recrystallization texture of the cold-rolled and annealed sheets increases with increasing cold rolling reduction if a recrystallization treatment is carried after α-region hot rolling, although the scale of the increase is less than in conventional cold-rolled sheets.