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A process model, which calculates the temperature gradient over the cross section of the rolled strand during its passage through the individual stands and cooling zones, has been developed for temperature control in wire rod and merchant bar mills used for the rolling of high-alloy steels. It consists of : a) A deformation model to calculate the strain, strain rate, torque, and contact times and surfaces of rolled strands; b) A material model to determine : - yield stress as a function of i) temperature, strain and strain rate; ii) recrystallisation during rolling pauses; - grain size resulting from recrystallisation and grain growth; c) A temperature model to determine temperature variations over the rolled piece cross and to calculate temperature distribution between the stands. Applications of the model covered the calculation of the effect of initial rolling temperature and speed, and different steel grades and cooling systems, on the variation of surface, core and average temperatures. The conclusion was that rolling speed, intermediate cooling systems and the yield stress of different steels greatly affect temperature.

Additional information

Authors: BRAUN-ANGOTT P, Verein Deutscher Eisenhuttenleute, Dusseldorf (DE)
Bibliographic Reference: EUR 11196 DE (1988) MF, 170 pp., ECU 8, blow-up copy ECU 21.25
Availability: (2)
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