TECHNOLOGY FOR CLEANING OF MOLTEN STEEL IN TUNDISH

Sheet and coated steel have been demanded to meet quality requirements of ever increasing severity in recent years. Reduction in nonmetallic inclusions is an important challenge in this respect. Protection on t he molten steel in the tundish against contamination is of special imp ortance in not only improving steel product quality, but also avoiding immersion nozzle clogging and increasing the number of sequence-cast heats. To supply molten steel with high cleanliness in a stable manner , the cleaning behavior of the molten steel in the tundish was investi gated and mechanism whereby the molten steel is kept clean in the tund ish was quantified. Based on the results achieved, technology was stud ied for keeping the molten steel clean in the tundish.