Community Research and Development Information Service - CORDIS


The aim of this research project was to optimize the conditions for producing hot-rolled sheet for tubes in a strip mill so as to achieve a better balance between tensile strength and notch impact value. The main finding was that the ferrite grain size was refined by lowering the reheating and rolling temperatures. Complete rolling schedules were simulated on the IRSID experimental rolling mill. A better balance between tensile strength and notch impact value was achieved through the refinement of the structure by lowering both the reheating temperature and the rolling temperature. Excellent results were obtained with the C-Mn steel, first when the rolling operation was terminated in the inter-critical zone and, secondly, when the cooling conditions (high-speed cooling and low coiling temperature) produced a very fine ferrito-bainitic structure. Industrial trials confirmed the main findings of the experimental study. In particular, the notch impact values achieved justify the enlargement of the strip mill to produce hot-rolled high-grade sheet for tubes.

Additional information

Authors: CHOQUET P, IRSID, Saint-Germain-en-Laye (FR);GENET S, USINOR, Paris (FR)
Bibliographic Reference: EUR 11190 FR (1988) MF, 175 pp., ECU 8, blow-up copy ECU 22.50
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