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  • Mould powder consumption, melting and lubrication and their effects on mould heat transfer and subsequent surface quality of continuously cast slab


Via measurements made on plant during casting, laboratory studies and mathematical modelling, Corus RD & Sviluppo Materiali (CSM), Dillinger Hüttenwerke, the Swedish Institute of Metals Research (SIMA) and SSAB studied mould powder consumption, melting and lubrication and their effects on mould heat transfer and subsequent slab surface quality. Collected plant data were used to characterise the properties and performance and also to provide base data for the models of powder consumption, melting and slag pool depth. These data enabled Corus to identify those parameters having a significant effect on powder consumption and Dillinger Hütte (over 30000 heats monitored) to characterise comprehensively their process with respect to mould powder consumption and its effect on product quality. Accurate in-cast measurements of slag pool depth were required and thus existing methods were reviewed and a new electrical conductivity based method developed by CSM. Mould heat transfer was investigated using thermocoupled moulds at SSAB, Corus and Dillinger. The work at SSAB and SIMR identified the optimum conditions and mould end plate design for casting of crack-sensitive, microalloyed, low carbon and peritectic grades. Dillinger observed that powder consumption was not the dominating factor for heat removal at the very low casting speeds used for the large section sizes cast there. Pirical rules and models reported in the literature for calculating the powder consumption from the casting oscillation parameters and powder properties were evaluated and recommendations made regarding their suitability for use in the partners� plants. An existing model of powder consumption was developed further and tested by Caruso CSM developed successfully a numerical model of powder melting, slag pool depth and consumption.

Additional information

Authors: NORMANTON A S, CORUS UK Limited, Middlesbrough (UK);LUDLOW V, CORUS UK Limited, Middlesbrough (UK);HARRIS B, CORUS UK Limited, Middlesbrough (UK);HECHT M, Dillinger Hütte, Dillingen (DE);DÄCKER C A, SIMR, Stockholm (SE);DI DONATO A, Centro Sviluppo Materiali (CSM), Roma (IT);SOHLGREN T, SSAB Oxelösund, Oxelösund (SE)
Bibliographic Reference: EUR 21907 EN (2005), 371pp. Euro: 45
Availability: Katalogue Number: KI-NA-21907-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 92-79-00138-8
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