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Final report on Contract No 7210-PR/141, 1 July 1999 to 31 December 2002.

This project aimed at investigating possible detrimental effects of Ti and TiNb microalloying additions on the castability and surface quality of low carbon and peritectic steels in the continuous casting of beam blanks and thin slabs. Castability problems (break-out rate, boiling or rimming in the mould, formation of scum, reduced casting speed) in the open stream casting of beam blanks of Si-killed steels were studied, including:
- evolution of steel and slag composition along the various steps of processing chain (from ladle to cast beam blank);
- evaluation of the inclusion content of the liquid metal to evaluate its influence on nozzle blockage;
- correlations between inclusion content and castability.

The castability could be improved by the introduction of a new mould casting powder. By means of simulation experiments of the continuous casting of conventional and thin slabs researchers analysed the hot ductility of peritectic steels with microalloying additions of Ti and Ti + Nb and of various Mn: S ratios. The combined effects of different temperature/time regimes with applications of stresses acting on the slab intended to reproduce the real conditions in the plant. The results were compared with the effects of modifications in the cooling strategy in the strand casting machine. The investigations covered measurements of the hot ductility trough, the formation processes of microalloying precipitates and their influence on hot flow strength, ductility and fracture behaviour.

Additional information

Authors: KÖTHE A, Institut für Festkörper- und Werkstoffforschung (IFW), Dresden (DE);WALMAG G, Centre de Recherches Métallurgiques (CRM), Liège (BE);JÄGER W, Thyyssen Krupp Stahl AG, Duisburg (DE);KOTHE A, Institut fur Festkorper- und Werkstoffforschung (IFW), Dresden (DE);DONNAY B, Arcelor / ProfilArbed Recherches, Esch-sur-Alzette (LU)
Bibliographic Reference: EUR 20812 EN (2003), 149pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20812-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-6137-3
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