2018 №02 (03) DOI of Article
2018 №02 (05)

Electrometallurgy Today 2018 #02
Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2018, #2, 37-40 pages

Nitrogen solubility in fluxes for electroslag technologies

G. M. Grigorenko, R. V. Kozin

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
Absorption of nitrogen from a gas phase by slags, which are used in electroslag technologies, was studied. The thermodynamics and kinetics of nitrogen absorption by calcium fluoride, which is a component of all the slags for electroslag technologies, were also studied. The relation between the content of nitrogen and carbon in calcium fluoride melt was established. Method of a weighted drop as applied to study the nitrogen solubility in all the fluxes was described. The equilibrium content of nitrogen was determined. Data are given about the nitrogen content in some fluxes after melting and after electroslag remelting. Data are given about carbon and nitrogen content in flux ANF-7, melted in arc flux melting furnace at different conditions of melting and blowing. The analysis of results of investigations showed that the nitrogen in fluxes of electroslag technologies is supposed to be in the form of CaCN2 compounds. It is shown that fluxes, containing the large amount of calcium fluoride, are characterized by a low concentration of nitrogen and cannot be a source of metal enrichment with nitrogen during remelting, and possibly, can promote the gas removal from it. Ref. 11, Tabl. 3, Fig. 4.

Key words: nitrogen; carbon; solubility; metal; slag; flux melting furnace; electroslag technology; electroslag remelting
Received:                21.02.18
Published:               25.05.18

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