CCタンディッシュ熱間リサイクル操業

概要

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In recent years, customers demands are getting more and more keen towards the diversification in steel grades and hence smaller lot weight. Those resulted in the reduction of number of sequence casting, higher tundish refractory cost and the increase of bottom portions, which are inferior in quality, in bloom continuous casting. To solve these problems, two key technologies, tundish recycle operation in hot condition and the tundish sealing have been developed in Chita Plant, Daido Steel Co., Ltd. They are summarized as follows;(1) In order to avoid air penetration into tundish, it was very effective to purge within the tundish by Ar gas blow, coupled with perfect sealing. Oxygen inside the tundish atmosphere decreased drastically from 2.5% to 0.3%, and thus, the quality of bloom bottom portion has been improved.(2) Tundish nozzle was modified in both design and material to solve the nozzle clogging and it enabled easy operation of tunidish recycling in hot condition.As the result, sequence casting ratio (heats/TD) has been increased to twice and tundish refractory cost has been reduced remarkably.
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