Clogging of the Submerged Entry Nozzle During the Casting of Titanium Bearing Stainless Steels

摘要

In the casting of titanium bearing stainless steels, nozzle clogging was found to be problematic and the clog was found to contain a high proportion of solidified metal. Analysis by EMPA indicated that a layer of titanium oxide was formed at the interface between nozzle inner wall and melt due to reduction of the silica in refractory by titanium in melt during casting. It is postulated that the formation of the titania layer leads to a better interfacial contact between the steel and the nozzle which leads to accelerated growth of the clog.