Community Research and Development Information Service - CORDIS


The flatness requirement of a strip is one of the major requirements stressed by the users of thin gauges cold-rolled sheet products of milled steel, tin plate and also stainless steel. Alternatively flat-coiled strips can undergo a shape change after slitting or cutting.

It is well known that tension levellers are effective to produce flat strips. However, depending on the technology, the process, and the strip grade and size, long bow, crossbow and residual stresses can appear after tension levelling and subsequent operations. The roller leveller operation is also known to affect both the shape and the distributions.

Theoretical mathematical models, tension flex levelling pilot machines, practical tests on industrial tension and roller levellers have been used to investigate flatness evolution, including stress distribution from the exit of temper rolling up to finishing and preparation lines.

The main working tasks of the project are:
- Determination and use of optimum system of residual stresses for flatness and internal stress measurements;
- Measurements of flatness, internal stress and process data before and after tension levelling, coiling, roller levelling and cutting on industrial plants;
- Development of a physical model to interpret the measurements correctly;
- Addition of a multi-roller levelling device on the existing tension flex levelling machine of BFI.

Additional information

Authors: VIENOT P, IRSID, Maizières-lès-Metz (FR);THOMAS T, Corus UK, Port Talbot (GB);THOOSE E M, Corus NL, IJmuiden (NL);YLITALO M, Outokumpu Polarit, Tornio (FI);MAAG A, BFI, Dortmund (DE)
Bibliographic Reference: EUR 20629 EN (2003), 144 pp. Euro: 25.00
Availability: EUR-OP reference: KI-NA-20629-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-5154-8
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