鋳型内電磁攪拌による連鋳鋳片の品質改善

概要

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The recent continuous casting technologies have been developed remarkably.In-Mold Stirrer (M-EMS) is one of the most effective technologies.In Daido Steel Co., Ltd. the M-EMS was installed at Hoshizaki Plant (billet caster) in 1987 and Chita Plant (bloom caster) in 1988 for improving the qualities.This paper describes the results of Woods metal and water model experiments and the metallurgical effects of M-EMS obtained in practical operation of billet and bloom caster.The results could be summarized as follows;(1) Stainless steel requires 1.6 times stronger stirring power compared with plain carbon steel at the same flow velocity of molten steel.(2) The optimum flow velocity of molten steel is 30∼60cm/sec. At the lower flow velocity, the quality improvements become smaller and at the higher, the slag and scum are entrapped at subsurface in mold.(3) The defects such as pin hole, slag spot, axial segregation and cavity could be decreased remarkably by the optimization of flow velocity of molten steel.
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