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Final report on Contract No 7210-EC/215, 946, 947, 123, 1 July 1996 to 30 June 1999

Four European laboratories have worked together to define in which conditions weldable steel grades, microalloyed with titanium, could be processed in new lines including EAF, near net shape casting and direct rolling.

The problems have been studied at various scales, from the basic hot torsion test up to pilot lines devoted to these processes, for flat and long products. This work indicates that hypostoichiometric or stoichiometric compositions in titanium with regard to nitrogen could give good results, the increase of nitrogen from EAF favouring the production of TiN instead of TiC, but this trend is highlighted mainly at a high cooling rate (after rolling).

Important questions such as the usefulness or not of a roughing step, the optimisation of the rolling schedule, the modelling of the precipitation, and the modelling of the static and dynamic recrystallisations have been tackled. The presence of an additional precipitation of copper has been confirmed. This case gives small copper particles in classical C-manganese steels, but elongated CuS in low manganese steels. The HAZ toughness of the titanium steels was good, but the HAZ toughness of the steels which were not titanium bearing was better. It is assumed that the copper precipitation replaced the titanium in those cases.

Additional information

Authors: POHL H, MPI, Düsseldorf (DE);MEDINA MARTIN S F, CENIM, Madrid (ES);RODRIGUEZ IBABE J M, CEIT, San Sebastián (ES);DONNAY B, CRM, Liège (BE);D'HAEYER R, CRM, Liège (BE)
Bibliographic Reference: EUR 20217 EN (2002), pp.264. Euro: 40.00
Availability: EUR-OP reference: KI-NA-20217-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3364-7
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