Stogniy Y. Development of technology for secondary treatment of steel for high strength wire rod with a specified level of properties.

Dissertation is devoted to finding ways to improve the production technology of low carbon steel for plastic wire rod with a using technological complex, which includes the electric arc furnace - degasser - installation of ladle furnace and casting machine for continuous casting. Based on the statistical analysis of passports of steel-melting determined the effect on the characteristics of the intermediate product on processes of secondary treatment, and formed as a result, the mechanical properties of steel. Defined the features of EAF product, that improve the efficiency of secondary treatment: high oxidized, low carbon content and high metal temperature. The influence of technological parameters of producing low-carbon steel on its mechanical and technological properties and determined that on the actual range of carbon concentrations (0,03 ? 0,08%), manganese (0,28 ? 0,41%), silicon (0,045 ? 0,164 %) a significant influence on properties were not identified. At the same time, marked a significant softening effect of boron - boron concentration is increased from 0.003 to 0.009% drop in tensile strength is about 15 MPa, and the yield strength up to 27 MPa. The calculations of the required level of oxidation of the intermediate product to ensure a sufficient degree of decarburization, and thermodynamic study of the mechanism of oxygen removal by vacuum treatment of steel allowed to determine the conditions of the reaction with carbon deoxidation, which ensures the achievement of specified low concentrations of carbon by oxygen in the metal. This approach reduces the cost of aluminum on the preliminary deoxidation, which prevents the formation of alumina inclusions, which negatively affect the flow of the casting process and performance of the metal. The main results introduced in the manufacturing process of OJSC"Moldova Steel Works".