Vacuum metallurgy processes are now the primary processes of manufacturing new metallic materials. Requirements concerning product purity and accuracy in determining chemical composition constitute a huge challenge arising from the needs of new technologies. Examples include the required parameters of metal powders applied in 3D printing.The subject of this paper is a kinetic model of the alloy steelmaking process, based upon the tank theory. Assumptions to this model enable the process to be simulated in real time. The method of determination of the equilibrium state at the metal-gas interface with the use of the Equilibr module from the FactSage® program is an essential component of the model. The computations were verified on the basis of laboratory heats made in a VIM 10-20 vacuum induction furnace.Keywords: vacuum induction furnace, process kinetic
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