Forecasting the mean flow stress of carbon and low-alloy steels in hot rolling on a strip mill

摘要

The effectiveness of the initial setup of the mill stands depends on the accuracy of the calculation of the mean flow stress of the rolled metal, the value of which is determined not only by the deformation parameters, but also depends on the chemical composition of the steel and the structural transformations of the rolled metal. This article proposes a mathematical model for the prediction of the mean flow stress of carbon and low-alloy steels during hot rolling on a strip mill, which allows to take into account, along with the deformation parameters, the content of chemical elements in the steel and the processes of recrystallization of the metal during deformation and during inter-pass times. The adequacy of the model was checked by comparing the results of the calculation of mean flow stress with the experimental data obtained by rolling of 100 strips 2-12 mm thick of 16 grades of carbon and low-alloy steels on a broadband mill 2000 NLMK. The influence of dynamic, metadynamic and static recrystallization on the mean flow stress of carbon and low-alloy steels in the mill stands is estimated. It is shown that taking into account the processes of recrystallization of the deformed metal can significantly improve the accuracy of the prediction of the mean flow stress.