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Transient Molten Metal Quality at the Start and End of DC Casting

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Transient Molten Metal Quality at the Start and End of DC Casting

Phil G Enright, N-Tec Limited, Oxford, England


Track: BILLET PROCESS & EQUIPMENT - Casting, Casthouse, Environmental Health & Safety

ABSTRACT—This paper shows how cast house operating practices at the start and end of a cast,
can lead to solute and inclusion transients that extend beyond the top and bottom crop lengths of a
cast log, and may therefore result in sporadic inclusions and streaking defects in anodized
extrusions. The Prefil® technique is used to measure and identify inclusions in the liquid metal
before casting, and also in the cast product itself. The results are used in conjunction with TP1
testing and a DC casting simulator to optimize grain refinement practices and control minor
solute distribution in billets.

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