Study and Modeling of Slab Deformation Processes in the Roughing Stands of Severstal’s Mill-2000 Hot-Rolling Line

The article presents results obtained in the study of slab deformation process in the roughing stands of Severstal’s Mill-2000 hot-rolling line. The implementation of a rolling process model based on the use of the DEFORM-3D software package for predicting the displacement of metal from the edges of the slab to the middle of the workpiece width is described. The convergence of the modeling results with the measurement data of the slab formed during roughing in the Mill-2000 rolling line of PJSC “Severstal” was experimentally confirmed. It was shown that the distribution of cross-sectional area reduction between vertical rolls does not significantly affect the displacement of metal from the narrow face to the wide one. The amount of metal displacement from the edge to the wide face is determined by the degree of deformation in horizontal rolls. In order to reduce metal displacement, it is necessary to reduce deformation in the first three horizontal passes. Modeling and experimental-industrial rolling demonstrated the redistribution of reductions between the Mill-2000 roughing stands to be insufficient for obtaining a displacement of less than 30 mm at a difference between the widths of initial slab and required intermediate bar of 50 mm or more. An effective solution to the problem of reducing strip side cuts involves the formation of 50×50 mm chamfers on the slab. The proposed method for modeling the slab deformation process in the Mill-2000 roughing stands can be used to study the effect of roll profiling, temperature and speed parameters, as well as total reduction in vertical rolls for ensuring minimum displacement of metal to the wide face.