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Abstract

This project provides a wide-ranging study of segregation for slab, bloom and billet products, and the development of models and practices to optimise plant performance.

Segregation in slab casting was studied by Mannesmann, IRSID and Corus highlighting the roles of casting speed, superheat and secondary cooling. Factors affecting sump position are particularly critical. Aspects such as bulging in this area, soft reduction and, in some cases, additional cooling are very influential. Studies on rolled plates showed that slab centreline can be correlated with segregation in the product despite some carbide dissolution on reheating. In some cases (e.g. structural columns) there is a danger that this segregate may enter critical parts of the product.

Casting and rolling of blooms was studied by Imatra and IRSID. Low superheat and mould stirring were beneficial. The relationship between segregation in the �as-cast� and rolled product was less clear than for slab casting. Significant assessment and modelling were directed towards the aspect of carbide formation and its dissolution during reheating for both blooms and billets.

IRSID, Sidenor and Imatra, addressed segregation in medium and high-carbon billets. Favoured conditions included low superheat, mould EMS, moderate casting speeds and relatively high secondary cooling. There was great difficulty in correlating �as-cast� segregation with that in the wire rod, probably due to much higher rolling reduction ratios.

Macro-segregation models were developed by CSM and Corus. The Corus model includes the effect of inter-roll bulging on central segregation. Both models were correlated with partners� plant data.

Additional information

Authors: EMTAGE P A, CORUS UK Limited, Middlesbrough (UK);WUNNENBERG K, Mannesmann, Duisburg (DE);HATONEN T, Imatra Steel Oy AB, Imatra (FI);LLANOS J M, Sidenor I+D, Basauri (ES);DE SANTIS M, Centro Sviluppo Materiali (CSM), Roma (IT);BOBADILLA M, IRSID, Maizières-lès-Metz (FR)
Bibliographic Reference: EUR 20886 EN (2003), 405pp. Euro: 55
Availability: EUR-OP reference: KI-NA-20886-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-6310-4
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