Estimation of Critical Strain for Internal Crack Formation in Continuously Cast Slabs

Abstract

In order to estimate the exact condition of the internal crack formation in continuously cast slabs, a new evaluating equation for this critical strain has been introduced based on many factors such as steel grades, strain rate, solidified shell thickness, and surface temperature of the slabs.
The characteristic of this equation is to determine the hot ductility, especially ZDT at the neighbourhood of solid-liquid interface, which has not been investigated quantitatively, and to make clear the relation between the critical strain for internal crack and the width of poor ductility range calculated from shell thickness, surface temperature, and ZDT.
The cracking condition in cast slabs could be explained well, using this calculated critical strain based on these factors.