Community Research and Development Information Service - CORDIS


Y/T (yield/tensile) is more and more a stringent requirement in product standards or construction codes and may prevent the application of high-strength steels and the development of new grades.

The primary objective of this project is precisely to achieve a better understanding of the effect generated by Y/T in this regard. Should this be identified and quantified, a secondary objective is then to define appropriate requirements. A third objective is to determine how Y/T can be controlled and to develop steels with a defined Y/T ratio.

A range of steel products and grades applicable to various structural applications is being studied. Yield stress comprises between 350 and 1000 MPa, thickness between 10 and 70 mm. Product types include plate, line, pipe, rod and bar.

Overall, it is concluded that Y/T must be considered in combination with other mechanical characteristics and the potential plastic strains to which the material will be subjected. Current limits to Y/T are generally thought to be too restrictive and there is scope for their relaxation. Where low Y/T is a specific requirement due to the necessity to withstand loading significantly into the plastic regime, alloy selection and control of processing conditions can be optimised to give a reduced Y/T while maintaining toughness.

Thus, the relevance of Y/T for high-strength steels is in many conditions rather limited. It is then recommended to reconsider all specifications involving this parameter in more documented ways, taking into account that strain hardening ability could be defined in a more precise way.

Additional information

Authors: FOURNEAUX P, CRM, Liège (BE);DAHL W, IEHK-RWTH Aachen (DE);BLECK W, IEHK-RWTH Aachen (DE);NIESSEN T, IEHK-RWTH Aachen (DE);BURGET W ET AL, Fraunhofer IWM, Freiburg (DE);STUREL T, IRSID, Maizières-lès-Metz (FR);ANDENNA C, CSM, Rome (IT);DEMOFONTI G, CSM, Rome (IT);FATTORINI F, CSM, Rome (IT);BROWNLOW P J, British Steel plc, London (GB);BANNISTER A C, British Steel plc, London (GB);DEFOURNY J, CRM, Liège (BE)
Bibliographic Reference: EUR 19987 EN (2001), pp. 567. Euro: 85.00
Availability: Available from EUR-OP sales agent URL:
ISBN: ISBN 92-894-1587-8
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