ANALYSIS OF CRACK FORMATION IN THE CASTING: A REVIEW

This analysis discusses the various types of internal and surface cracks that may form during steel casting continuously. Due to the high Thermal structural properties of the materials are analysed and the pressures of the solidifying shell are measured as well as functioning and metallurgical influences considered to impact the development of crack for each crack type. This method shows the importance of two low ductility zones in steel. There is one region above 1340 ° C and it is possible that all internal cracks and longitudinal surface cracks are formed. The other regions ranges from 700 to 9000 C and is correlated with the presence of soluble aluminium, niobium and vanadium. Lateral surface cracks can be associated to the other latter zone in slabs. Combined with an understanding of the stresses produced by continuous casting, this knowledge makes it possible to propose crack formation mechanisms and relate them to operational and metallurgical variables.