Effect of Annular Step SEN with Carbon Free Liner in Reducing Alumina Clogging Problem at BlueScope Steel

摘要

At the No. 2 and No. 3 slab casters at Port Kembla Steel Works of BlueScope Steel in Australia, there was a strong drive to improve the steel flow pattern and anti-clogging countermeasures in order to improve the steel quality. By the application of the Annular Step SEN with a carbon free liner combined with multi layer porous upper nozzle, alumina clogging incidence in the SEN was drastically decreased. In order to achieve stable casting with less alumina clogging incidents, it is very important to have a synergy effect of appropriate Ar gas practice, configuration of the SEN and materials of the SEN.