Electroslag billets casting using electrically conductive exothermic fluxes
Abstract
Vlasov A. F., Makarenko N. O., Kushchiy A. M., Golub D. M. Electroslag billets casting using electrically conductive exothermic fluxes // Herald of the DSEA. – 2019. – № 2 (46). – P. 5–10.
The method of manufacturing billet sectors of the coilers of 20C3MVF (20Х3МВФ) steel using the “solid” start and exothermic fluxes, which significantly reduces the laboriousness of their manufacture, and the molded billet sectors of the coilers of the coilers, obtained by the ESR method, have a smooth surface without corrugations, sinkers, slag inclusions, heat treatment provides the required mechanical properties in cast electroslag metal within the grade composition of this steel and is higher than that of the forged metal of open smelting. A mechanical mixture of aluminum powder and industrial scale was considered as the basis for the exothermic mixture. The effectiveness of electroslag casting in the manufacture of cast billets by using an exothermic flux (scale, ferroalloys and aluminum powder) in quantities sufficient for exothermic reactions to be carried out was confirmed; ECL ensures the production of high-quality castings with minimal allowances for machining. The quality of cast electroslag steel 20H3MVF was studied using a “solid” start, its gas, chemical composition and microstructure were analyzed, and the quality was consistent with forged steel of open smelting. The expediency of using a “solid” start with the use of an exothermic flux in the initial period of targeting a slag bath of the required volume at ECL was studied, while the electroslag castings of the winder drum blanks are characterized by a defect-free surface with a yield of up to 85%, a stable cross-section chemical composition, low content of gases and non-metallic inclusions. The structure of steel 20H3MVF, related in its chemical composition to the martensitic-ferritic grade steel, was studied both in the cast metal of the ESR and in the forged metal of the induction melting.
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