Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2020, #1, 8-13 pages
Thermodynamics of interactions and physical properties of slags of 30CaF2/30CaO/30Al2O3 (SiO2, MgO) system at electroslag remelting
L.O. Lisova1, G.P. Stovpchenko2, I.O. Goncharov1, Ia.V. Gusiev1, L.B. Medovar1
1E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2PC «ELMET-ROLL». P.O. Box 259, 03150, Kyiv, Ukraine. E-mail: office@elmet-roll.com.ua
Abstract
Thermodynamic calculations of the equilibrium content of components in the gas–slag–metal system were
performed for the conditions of electroslag remelting of 15Cr11MoV steel in inert gas atmosphere (argon) under
30CaF2/30CaO/30Al2O3 slags with various SiO2 (1; 2,5; 4 wt.%) and MgO (3; 6; 12 wt.%) content. Appearance of
MnO (0.04…0.07 wt.%) and FeO (0.01…0.02 wt.%) oxides in the equilibrium composition of the system indicates
a minor oxidizing effect caused by the slag on the metal. The element content in the metal still remains within the
margins of standard requirements to 15Cr11MoV steel. According to the results of viscosity and electrical conductivity
measurements, a new slag composition has been proposed (ANF-39: 29…35 % CaF2, 30…36 % Al2O3, 27…32 % CaO,
2…4 % MgO, 1…3 % SiO2, TC 20.5-05416923-112: 2015), which has a wider solidification range and lower
conductivity than the foreign analogue ESR 2015. The latter is a prerequisite for the reduction electricity consumption
during remelting. Ref. 17, Tabl. 2, Fig. 2.
Keywords: electroslag remelting; thermodynamics of gas–slag–metal interaction; viscosity; electrical conductivity;
energy-efficient slag
Received 4.02.2020
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