9th ECCC European Continuous Casting Conference – ECCC 2017

Ultra low C (ULC) steel is one of major products of high quality steel in a number of steelmakers. Slab of the ULC steel is produced by continuous casting process in order to maximize process efficiency. Ti is one of important alloying elements of the ULC steel, in order to secure good formability of the steel, as it is used for outer panels of automobile. It has been a long problem that increasing Ti content in the steel increases extent of nozzle clogging during the continuous casting process. In the present study, the clogging phenomena for the Ti-ULC steel is reviewed, and possible source of the formation of clogging material is discussed. Particular attention has been paid to the interfacial reaction between the Ti-ULC steel and the refractory material use for submerged entry nozzle. Phase diagram of the steel-refractory system is applied in order to figure out what types of materials are formed, and how this Ti affect the formation of such material at the interface between the steel and the refractory.