直流型タンディッシュプラズマヒーターのNo.2 CCへの適用

概要

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DC transferred type plasma heater for tundish was introduced in No.2-CC at Chita Plant. The plasma heater makes it possible to keep the molten steel temperature in tundish constant during cast and brings the benefits in decreasing nozzle clogging caused by low temperature and the loss in productivity caused by high temperature. The operation under reduced number of strands (4 strands operation →2 strands operation), which improves the casting yield, can be applied even to the steel grades with low casting velocity, as the casting time can be prolonged with the plasma heater. In order to avoid temperature segregation in tundish with the plasma heater, arrangement of the dam was optimized by using heat fluidization analysis, so that more than 60% of thermal efficiency is obtained in the plasma heater operation. The running cost of the plasma heater is quite reasonable, because N2 gas can be applied to most of the steel grades in No.2-CC and Cu electrode can be adopted in DC transferred type plasma heater.
電気製鋼研究会の論文