Fluctuated cooling conditions and solid shell resistance in continuously cast steel slabs

Abstract

Mathematical models have been coupled and applied to evaluate the fluctuated cooling conditions and to determine heat flow and solid shell resistance of continuously cast steel slabs. Comparisons with previous surface temperature measurements verify the predictions of the heat flow model. The effects of the changes in the cooling conditions, casting speeds and various isotherms on the neutral axis of effective solid shell and the solid shell resistance I c were examined and discussed. The model predictions indicate that parameters affecting the solid shell resistance are the effective solid shell thickness and its temperature gradient distribution. The results illustrate that the solid shell resistance decreases with increasing in the reheating of slab surface and increases with increasing in the cooling surface. Also, the results point out that the surface temperature profile has a significant effect on the solid shell resistance with the distance from the meniscus. Furthermore, the results indicate that the solid shell resistance varies between pairs of rolls.