One of the principal problems in the production of steel castings is the increase in their mechanical characteristics. To ensure their prediction within the frames of the developed mathematical models, it is rather important to derive the dependencies of "composition-property" type. However, the available data either take into account the influence of one of the components only or are contradictory. In the present paper, on the basis of correlation analysis of the dependencies of tensile properties and impact strength of carbon steels (0.15 to 0.30% C) produced, using basic and acid processes on the contents of five principal components of (C, Si, Mn, S, and P), we have obtained functional relations of the second order, allowing prediction of mechanical properties of steel at constant parameters of heat treatment as early as at the stage of casting and refining. It is established that at certain combinations of components, we observe trends in the "composition-property" dependencies differing from current notions.
