Electrometallurgy Today, 2023, №04



2023 №04 (04)

DOI of Article 10.37434/sem2023.04.05

2023 №04 (06)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2023, #4, 35-43 pages

Nitrogen absorption by 04Kh18N10 steel in plasma-arc melting under slag of CaO–Аl₂O₃ system

V.O. Shapovalov¹, V.G. Mogylatenko¹, R.V. Lyutyi², R.V. Kozin¹

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute». 37 Prospect Beresteiskyi (former Peremohy), 03056, Kyiv, Ukraine. E-mail: vmogilatenko@gmail.com

Abstract
Nitrogen as an alloying element of steel is a strong austenitizer, and it has an essential influence on mechanical properties of steels of different classes. It is rational to use gas phases for nitrogen alloying, and the process can be intensified with application of highly-concentrated energy sources, for instance, plasma. One of the determining factors of metal alloying is partial pressure of nitrogen and process temperature. It is difficult to find works, dealing with nitriding of metal melts, in plasma-slag process. The paper gives experimental data on dissolution kinetics and nitrogen solubility in 04Kh18N10 steel. Derived mathematical models of nitrogen dissolution at plasma melting are highly significant, which is indicated by the respective determination coefficients. At less than 0.1 atm partial pressure of nitrogen above the melt, temperature in the range of 1823…2323 К practically does not influence the content of nitrogen in steel, and at higher partial pressure nitrogen content in steel decreases with temperature rise. Melt temperature under the experimental conditions was assessed as 2385 К. It was determined that the coefficient of nitrogen distribution between the metal and slag changes only slightly at up to 1 atm partial pressure of nitrogen, and it is equal to 1.1…1.2. 24 Ref., 2 Tabl., 6 Fig.
Keywords: nitrogen-containing steels, plasma-slag melting, nitrogen, absorption kinetics, solubility, distribution coefficient

Received 31.08.2023

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