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Final report on Contract No 7210-PR/093, 1 July 1998 to 31 December 2001.

The project aimed to assess the influence of residual tramp elements (Cu, Ni, Mo, Cr, Sn, Sb and As) on the processing conditions and on the final properties of hot-rolled products. Its second objective was to integrate the derived metallurgical relationships into a model able to preset the rolling parameters and to predict the final product characteristics.

Three levels of tramp elements were studied, the low level corresponding to the mean content of tramp elements found in electric arc furnaces (EAF), and the intermediate and high levels referring respectively to the maximum contents encountered in EAF steels currently and in the future.

Some tramp elements contribute to increasing the rolling forces by changing the stress-strain curves or retarding recrystallisation. Among them, Sn, Mo, Sb and As are the most influential. Particular attention must be paid to Mo when added as alloying element. Equations for stress-strain curves including dynamic recrystallisation have been established and can be used in rolling force prediction models. The retarding effect of tramp elements on static recrystallisation is also reported.

The detrimental effect of tramp elements on mechanical properties has been analysed. The solid solution hardening equations have been assessed and can be integrated into models. Nevertheless, the most important effect is due to microstructure changes. The effect of tramp elements has been quantified, separating thermodynamics and kinetics effects. Many results of transformation kinetics and corresponding microstructures are available for different chemical compositions.

Additional information

Authors: CORNET X, CRM, Liège (BE);DONNAY B, CRM, Liège (BE);CAUQUIS M ET AL, IRSID, Maizières-lès-Metz (FR);LLANOS J, Sidenor, Basauri (ES);ZUFIA A, Sidenor, Basauri (ES)
Bibliographic Reference: EUR 20464 EN (2002), pp.158. Euro: 23.50
Availability: EUR-OP reference: KI-NA-20464-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-4233-6
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