Abstract
Four deep drawing sheets containing different quantitie of sol. Al were heat-treated in laboratory in similar condition to that of hot-rolling strip-mill, and N, C precpitations were examined by internal friction and chemical analysis. The results were as follows: (1) The finishing temperature had little effect on precipitation. (2) The higher the sol. Al content and coiling temperature, the larger were the precipitations of N and C. (3) N and C dissolved interstitially less than expected from chemical analysis. (4) N precipitation promotes that of C. With these results, the mechanism of formation of elongated grains was discussed.
