Abstract
Low carbon Al-killed steels for deep drawing quality, containing various amount of N and Mn, were cold rolled 65% and annealed up to 700°C at various heating rates.
Steels annealed at the adequate heating rate (peak heating rate) showed large elongated grain and strong {111}‹011› oriented recrystallization texture, while those annealed at the other heating rates showed fine grain with {554}‹225›+ {111}‹011› oriented recrystallization texture.
The peak heating rate was affected not only by sol. A1 contents but also by N contents and by Mn contents.Increase of N contents induced the peak heating rate faster and {111} intensity at the peak higher, on the other hand, increase of Mn contents induced the peak heating rate faster and {111} intensity at the peak lower.
Discussions were made concerning the difference in recovery and recrystallization behaviour among the peak heating rate and the other, and the roles of N contents and Mn contents on the peak heating rate. N contents were thought to have an effect on AIN precipitation rate, while Mn contents were thought to have effects on recovery and recrystallization rate of cold rolled structures. The change of the peak heating rate was supposed to be caused by those effects of N and Mn.
