Effect of Hot Rolling in Ferrite Phase on γ-value of Cold Rolled and Annealed Extra Low Carbon Steel Sheet

The effect of hot rolling in ferrite phase on γ-value and recrystallization texture of cold rolled and annealed extra low carbon steel has been studied. In order to eliminate the inhomogenious texture formation through thickness direction, the hot rolling with good lubrication condition was performed in this experiment. The rolling texture was formed for the steels hot rolled in non-recrystallization ferrite region. This rolling texture brought the development of rolling texture after cold rolling and brought high γ-value after annealing. The cold reduction giving highest γ-value was depended on the formation of rolling texture in hot rolled steel sheet. Even in the 70 or 80% of cold reduction, γ-value of 2.3, which is as same as the highest value obtained by 90% of cold reduction in the conventional production process, was obtained in Ti or Nb-added extra low carbon steel by applying hot rolling in non-recrystallization ferrite region.