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The aim of the project was to study the metallurgical opportunities of a compact in-line reheating treatment after hot rolling. Such reheating could be applied in two different rolling lines: either on the run-out table of the conventional hot-strip mill or just before the coiler in a heavy warm-rolling line aiming at the production of thin-gauge hot-rolled steels for direct applications or a softer hot band to facilitate the subsequent cold reduction. Results obtained show the possibility of developing new products (in term of thickness range, final properties) and new process routes for existing products. - Deep drawable steels for direct hot-rolled application: a new range of thin and drawable products is achievable by direct hot rolling. - Steel for electrical application: the hot-rolled microstructure can be improved by direct reheating, which may help to suppress a supplementary step of batch annealing. - Quenched and tempered qualities: these can be developed directly on the hot-strip mill, avoiding the extra step of tempering. - Pearlite containing steels: the cold rollability of high-strength cold-rolled and annealed steels can be improved. Apart from these industrial results, a better understanding of the mechanisms of microstructure evolution in these products was obtained and can be applied to a classical process. The metallurgical results and the high-power inductor required orientate the application on the heavy warm-rolling line. We give insights to the economical evaluation that can be used by any European steelmaker, after adaptation of the assumptions, to its real environment (market, existing line, production, etc.).

Additional information

Authors: IUNG T, Arcelor Research (IRISID), Maizières-lès-Metz (FR);LANNOO G, CRM, Zwijnaarde (BE);GARCIA DE ANDRES C, CENIM, Madrid (ES);SALVATORI I, Centro Sviluppo Materiali (CSM), Roma (IT)
Bibliographic Reference: EUR 22831 EN (2007), 132 pp. Euro: 25
Availability: (Catalogue Number: KI-NA-22831-EN-S)
ISBN: ISBN: 978-92-79-05479-2
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