Abstract
The hot rolling pass schedules in a mass productive rolling line were examined to confirm the effect on recrystallization structure of commercial purity aluminum sheets. In the conventional hot rolling condition of 43% reduction for each pass in the 3-stands finishing mill, well developed cold rolling texture and taller 45°-4 ears of the drawn cup are obtained for the cold rolled sheets. These tall 45° ears tend to change into 0°/90°ears after the final annealing. However, in the case of 53% reduction for each pass in the finishing hot rolling, moderately tall 45°-4 ears of the cold rolled sheet have become a little bit smaller after the final annealing. The less change of 45° ear in the latter case is due to continuous recrystallization by the pinning of fine second phase particles which are estimated to be precipitated on the deformation structure during and after the higher reduction passes in the finishing hot rolling.
