高炭素鋼ブルームCCにおける内部品質の改善

概要

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In general, it is very difficult to avoid keen center segregation in high carbon steel during bloom casting.M-EMS (Electro-Magnetic-Stirrer in Mold) was newly introduced to the bloom caster, besides existing two steps of strand-EMSs, at Chita Plant, Daido Steel, Co., Ltd. in June 1988, for the purpose of center quality improvement.In this paper, the technology on center quality improvement and high speed casting of high carbon steel using three EMSs are discussed.The results are summarized as follows;(1) For steel of less than 0.6% carbon content, the introduction of M-EMS has contributed to the increase of casting speed by about 5% together with the quality improvement.(2) Internal cracks which occur during high speed casting, due to the straightening of the unsolidified bloom core by pinch rolls at final solidification stage, have been successfully solved by optimum pressure control of the pinch rolls.(3) For steel of 1% carbon content such as bearing steel, the center quality has been improved by optimiging the casting speed and EMSs operation.
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