FACTORS INFLUENCING PLANAR ANISOTROPY OF BATCH-ANNEALED COLD STRIP

Based on small titanium contents, cold-rolled and batch-annealed sheet can be produced with a quasi-isotropic forming behaviour. Using the c hemical composition of deep-drawing steel, the influence of low titani um contents on the deformation and recrystallization textures has been investigated. Whereas the deformation texture was not affected by the addition of titanium, the recrystallization textures showed clear dif ferences. For example, the volume fractions of orientations correspond ing to the deformation texture were increased by the addition of titan ium. The reczystallization kinetics is slowed down by the addition of titanium. To achieve a low planar anisotropy, the delay of recrystalli zation due to Ti-alloying has to match the driving force for recrystal lization, i. e. the degree of deformation. Furthermore, a low coiling temperature after hot-rolling and a Ti/N-ratio of > 4.0 are required t o produce deep-drawing steel with a low planar anisotropy.