ABSTRACT
Composite components of the mathematical model of the process of hot rolling of wide-strip steel are: the model of deformation; the methods for the calculation of the process parameters; the method of determining the strip temperature; the method of controlling deformation of metals. The grain size of austenite formed during heating for rolling a metal depends on the chemical composition of the steel, temperature and isothermal holding time. Changing the heating temperature and the phase composition of the steel, the presence of impurities and their subsequent dissolution change the grain growth mechanism. At the start of bainitic and martensitic transformations the carbon concentration of the untransformed decayed austenite is in general different from the carbon concentration in the steel. The plastic and toughness properties of the steel are strongly influenced by the presence of non-metallic inclusions – oxides and sulphides in the hot-rolled products, primarily their volume fraction and particle size.
