Abstract
Stress and strain in freely shrinking shell within a CC mould were calculated. The maximum tensile strain was resulted in a 0.14%C steel in the brittle temperature range near the melting point when the peritectic reaction below a quasi-solidus temperature (Ta) was considered as well as the Ar4 transformation above Ta-30°C. Stress and strain localization to a thinner shell in the mould was analyzed. Stress and strain in the shell at the beginning of a secondary cooling zone were also calculated. Finally, formation of the thinner shell was mathematically modeled from the view point of thermally induced shell deflection.
By the use of the results above, effects of carbon contents, flaw size in mould surface, and secondary cooling on longitudinal surface cracking and crack depth in continuously cast slabs were discussed, and then the experimental result and experience in the continuous casting operation were explained.
