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This research evaluates the feasibility of casting Si/Mn steels, and of their further surface treatments. The pilot casts confirm this feasibility. In-line hot rolling still leads to non-homogeneous structures through the strip thickness, thus limiting dynamic recrystallisation to a zone close to the surface. Consequently, total elongation is often lower than expected. Scale growth is described by existing models; it may be limited using shrouding devices. Batch galvanising of the industrial pilot line samples is satisfactory. Electrogalvanising and Aluminising show a fair coating. Hot dip galvanising of (Si < 0.5 %; Mn < 0.8 %) grades seems acceptable except in one case (Mn = 0.2 %; Si = 0.5 %) with bare spots. Hot dip galvanising of micro-alloyed and DP 600 steels are not far from reference steels. Processing alloyed steels through the direct sheet casting process appears feasible. Beyond commodities already produced that way, some alloyed steels are accessible. Hot dip galvanising of the lower alloys gives satisfactory surface aspects. Processing of higher alloyed grades needs further optimisation to get the surface quality.

Additional information

Authors: NICOLLE R, Arcelor Research (IRSID), Maizières-lès-Metz (FR);LAMANDE A, Arcelor Research (IRSID), Maizières-lès-Metz (FR);SCHMITZ W, ThyssenKrupp Stahl, Duisburg (DE);LEUSCHNER R, ThyssenKrupp Stahl, Duisburg (DE);KOPP R, RWTH, Aachen (DE);HIRT G, RWTH, Aachen (DE);SENK D, RWTH, Aachen (DE);LAUSCHER J, RWTH, Aachen (DE);GROSSE A, RWTH, Aachen (DE);KANE-GARCIA W, RWTH, Aachen (DE);BADOWSKI M, RWTH, Aachen (DE);PORCU G, Centro Sviluppo Materiali (CSM), Roma (IT);FERRAIUOLO A, Centro Sviluppo Materiali (CSM), Roma (IT);SFORZ M P, Centro Sviluppo Materiali (CSM), Roma (IT)
Bibliographic Reference: EUR 22817 EN (2007), 196 pp. Euro: 25
Availability: (Catalogue Number: KI-NA-22817-EN-S)
ISBN: ISBN: 978-92-79-05360-3
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