RF State Research Centre JSC SPA “CNIITMASH” (Moscow, Russia):

L. Ya. Levkov, Dr. Eng., e-mail: LYLevkov@cniitmash.ru
D. A. Shurygin, Cand. Eng., e-mail: Shurygind5@mail.ru
V. S. Dub, Dr. Eng., Prof., Scientific Chief, Institute of Metallurgy and Machine-Building

“Ruspolimet” PJSC (Kulebaki, Russia):
V. V. Klochay, Cand. Eng., General Director

The new method for management the content of elements that have a high thermodynamic affinity for oxygen in metal at electroslag remelting has been developed on the basis of ideas of a slag melt as a phase with variable stoichiometric composition, which depend on the chemical potential of oxygen. The model of oxygen behavior has been proposed in electroslag remelting taking into account a combination of thermodynamic factors (the chemical composition of the electrode metal, the composition and the amount of deoxidant inputs, the slag composition, its oxidation and temperature) and the kinetic characteristics (the reaction surface of metal-slag interaction, mass transfer rate in metal and slag), which allows prediction of oxygen, aluminum, silicon and titanium concentrations in the electroslag remelting ingot metal. The opportunity of refine managing and controlling the physical and chemical parameters of the metal during consistent melting of the ingot is shown. The results of the industrial implementation of slag deoxidation method at production of ingots from low-alloy, high-chromium and titanium-doped steels are presented. Original data are obtained at the implementation of complex technologies of electroslag remelting for the manufacturing of gas turbine disks, solid-block valves and in-vessel internals of Х-tree and shut-off valve.

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