The paper presents the results of numerical and physical modelling of the development of microstructure during the process of hot rolling of 20 mm diameter plain round bars. The tests described in the paper were carried out for the technological conditions of a sample bar rolling mill. The material used for the tests was low-carbon cold heading steel, 30MnB4. The numerical modelling studies were carried out using the FORGE® and QTSteel programs. For the physical modelling of the process under examination, the metallurgical process simulator GLEEBLE 3800 was employed.Keywords: Numerical modelling, physical modelling, microstructure development, cold upsetting steel
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