Bezshkurenko O. Improvement of processes of deoxidation and out-of-furnace treatment of high-carbon electric steel for stabilization of conditions of continuous casting

The decision to improve the technology of steel smelting in the electric arc furnace, the extraction of high-carbon cord steels is obtained. Ensuring the quality of steel by the content of sulfur, nitrogen and stable casting of steel on CCM due to the achievement of regulated content and composition of non-metallic inclusions. The rational parameters of the continuous technology of production of pure high-carbon steel using the "AF-LF-VD-CCM" complex are theoretically substantiated. The efficiency of the use of complex deoxidizers in the production of steel is shown, the synergistic effect of the joint deoxidizing action of the deoxidizing elements. It is shown that the formation of liquid nonmetallic inclusions occurs at the established ratio of calcium to sulfur and aluminum (with a given content of dissolved oxygen), which contributes to the formation of complex liquid deoxidation products without the formation of pure sulfides, which have a high melting point. The expediency of using the high deoxidizing ability of carbon under pressure reduction has been proved and the efficiency of using the reverse flow diagram of the AF ? VD ? LF ? CCM is grounded. The possible causes of overgrowing of dispensers with continuous casting of high carbon electro steel are established and analyzed. It is shown that the main reason of sediments is the change in the composition of steel, the application of alumina lining of steel and expanded metal, problems in protecting the jet of metal from secondary oxidation, which leads to an increase in the oxidation of the metal and accelerates the formation of magnesia spinel MgAl2O4 with a melting point of 2135 ° C. As a result of the implementation of the developed technical solutions, the technological efficiency of the processing of high-carbon wire rolled metal into metal mills has been improved on the metal enterprises - the breakdown at winding has been reduced 14 times, with drawing - 10 times. Keywords: high carbon steel; After-treatment; Impurities; Non-metallic inclusions; Overgrown dispensers; Strength of steel.