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The aims of this multinational project involving British Steel, IRSID (France) and CSM (Italy) are to understand the formation of longitudinal facial depressions and cracks in peritectic carbon and austenitic stainless steels, examine techniques for their reduction and develop neural networks to assist in their prediction online. Two types of SENs were studied and it is proposed that a small zirconia band grain size could be beneficial. Larger zirconia grains eroded from the SEN could be trapped at the meniscus, modify heat transfer and initiate a depression in the critical middle carbon steels where, it was shown, the surface is under compression. It has also been shown by measurements in the mould that the steel in the SEN area is colder than other zones in the mould. The non-uniformity increases slab size and when casting speed decreases. IRSID and British Steel used different groove patterns in the mould broad face plates in an attempt to reduce heat transfer.

AST and CSM have developed Master cast for the real time prediction of the central longitudinal depression on stainless steel slab surface, at the continuous casting plant of Terni works. The new system allows the real time diagnosis of the fluxes lubricating behaviour and selection of the best fluid dynamic conditions for achieving a soft heat transfer condition in the meniscus perimeter. .

Additional information

Authors: NORMANTON A S, British Steel, Teeside Technology Centre, Middlesborough (GB);HUNTER N, British Steel, Teeside Technology Centre, Middlesborough (GB);SPACCAROTELLA, CSM Terni (IT);MORAND H, IRSID, Groupe Usinor, Maiziþres-lþs-Metz (FR)
Bibliographic Reference: EUR 19380 EN (2000) 166 pp., EUR 11.50
Availability: Available from EUR-OP Sales Agents
ISBN: ISBN 92-828-9476-2
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