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Title

MATHEMATICAL MODELLING OF THERMAL EVOLUTION AS A TOOL FOR ENHANCING STEEL ROUGH ROLLING

Authorship

Santos, Antonio Adel dos; Resende, Bruno Alves

Santos, Antonio Adel dos

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Resende, Bruno Alves

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DOI

10.5151/9785-9785-32179

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Abstract

Temperature, microstructure and dimensions are the main material parameters to be controlled during hot rolling of steel. Although thermal mathematical models have long been developed and applied for hot strip rolling, each Hot Strip Mill (HSM) must have its own model adapted to its facilities. Thus, a mathematical model for temperature and scale evolution during rough rolling has been developed for the Usiminas HSM at Ipatinga Plant. The model achieved a high level of accuracy, which was assessed by comparing measured values of temperature at the hot strip mill entry with the calculated ones, the difference ranging from 10° to 18°C. Application examples have shown that the slab can be occasionally stopped before start of rolling for as long as a couple of minutes without compromising its further processing. On the other hand, if the transfer bar stops after rough rolling even for short time, further processing in the HSM can be hindered, due to excessive temperature drop. In case of such abnormal line stop, the model can be used as a tool for decision-making to either continuing the planned rolling schedule or to change the route, thus improving the overall rolling process.

Keywords

Mathematical model; thermal evolution; steel rough rolling