Prediction of Grain Size, Precipitation and Crack Susceptibility in Continuous Casting

The formation of precipitates, especially along austenite grain boundaries, greatly affects the formation of transverse cracks on the surface of continuous-cast steel. The steel composition and cooling history influences the formation of precipitates, and the higher temperature and corresponding larger grain growth rate under oscillation marks or surface depressions also have an important effect on crack problems. This paper develops a model to predict and track the amount, composition and size distribution of precipitates and the grain size in order to predict the susceptibility of different steel grades to ductility problems during continuous casting processes. The results are important for controlled cooling of microalloyed steels to prevent cracks and assure product quality.