Abstract
Cast steel was smelted in an electric arc furnace with a capacity of 25 tons. In the work, the mechanical properties of cast steel of 60 heats of steel grades 20L, 25L, 30L and 35L are determined. The chemical composition of the cast steel differed mainly in the content of carbon in the metal, and the difference in the content of other elements was insignificant. The following parameters of mechanical properties of steel were determined in the mechanical testing laboratory: yield strength, tensile strength, relative elongation, relative contraction, impact toughness and Brinell hardness. Using correlation analysis, a close relationship was established between the property parameters. Temporal strength has the strongest effect on all other parameters of mechanical properties. Correlation and regression analysis of the influence of each chemical element on the mechanical properties of steel allowed us to identify statistically significant linear dependencies of all the parameters of the properties on the carbon content in the metal. The carbon content values necessary to meet the requirements of the standard for mechanical properties were calculated. A narrowed range of carbon content in the smelted metal is recommended: from the minimum to the average values recommended by the standard. This will reduce the consumption of carbon-containing materials and shorten the duration of steel melting in an EAF.
Keywords:
cast steel, chemical composition, carbon content, mechanical properties