Effect of Roll Surface Profile on Thermal-Mechanical Behavior of Continuously Cast Bloom in Soft Reduction Process

Abstract

A two-dimensional finite element model based on elastic-visco-plastic constitutive laws has been established to investigate the effect of roll surface profile on thermal-mechanical behavior of steel in the convex roll soft reduction (CRSR) process during bloom continuous casting. The reduction efficiency of convex rolls under different conditions and the probability of internal crack in the bloom has been discussed in this study. It is noticed that the reduction efficiency of the narrow convex roll is larger than that of the wide convex roll with the same reduction force or reduction amount. Besides, with the increasing solid fraction of the bloom center in the reduction zone, the reduction efficiency of the convex roll decreases, while the needed reduction force increases. Furthermore, the narrow convex roll is more sensitive than the wide to the formation of internal crack under the same reduction amount, especially in the cases where the solid fraction bloom center is low.