Secondary electrothermal alloying and refining of low-alloyed steel

Шрифт:
395

https://doi.org/10.15407/steelcast2019.10.056

Met. litʹe Ukr., 2019, Tom 27, №10-12, P.56-63

A.V. Kharchenko1, PhD (Engin.), Senior Research Scientist, Associate Professor at the Department of Metallurgy, e-mail: odds@i.uahttps://orcid.org/0000-0003-3717-3872, Web of Science ResearcherID: S-8907-2017
R.V. Sinyakov2, PhD (Engin.), Senior Research Scientist, Head of Converter Production Department, e-mail: rvsr@ukr.net, https://orcid.org/0000-0003-4910-4444
N.V. Lichkonenko1, Senior Lecturer at the Department of Metallurgy, e-mail: nvlichkon75@ukr.net, https://orcid.org/0000-0002-7960-061Х, Web of Science ResearcherID: AAA-2713-2020

1Engineering Institute of Zaporizhzhia National University (Zaporizhzhia, Ukraine)
2Ming Xing Technology Company (Beijing, China)

Received 10.10.2019

UDK 669.046.582.2

The paper presents unit general scheme and research results for a new method of out-of-furnace steel processing based on an equilibrium shift in the metal-slag-gas system under the action of an electric charge applied to liquid slag – secondary electrothermal alloying and refining (SEAR). Thermodynamic modeling of SEAR based on the Gibbs method of chemical
potentials confirms the high efficiency of this process and is in good agreement with the experimental results obtained previously. Depending on the polarity of the electric charge applied to the slag, SEAR can be used both for deoxidation, alloying, and desulfurization, as well as for oxidative refining and decarburization of liquid steel. The study reveals the influence of the
specific charge of slag on the pressure of the gas phase, the content of impurities and alloying elements in the process of secondary electrothermal alloying and refining of low-alloyed steel. The main parameters of SEAR for technological operations of deoxidation, alloying, desulfurization, dephosphorization, and also oxidative refining and decarburization of liquid steel are determined. For alloying steel with alkaline earth metals, the SEAR technology allows the use of metallurgical slag instead of scarce flux-cored wire, which, in turn, contributes to the production of competitive steel with minimal cost. Unlike other methods of out-of-furnace alloying and refining, SEAR technology has several advantages, including the possibility of partial
utilization of converter and blast furnace slag, a significant reduction in pollution by non-metallic inclusions during processing, reduction of emissions and smoke generation, and high economic efficiency.

Keywords: Steel, alloying, refining, slag charge, thermodynamics, calcium, magnesium.

REFERENCES

1. Duckworth, W.E., Hoyle, G. (1973). Electroslag Refining. Мoscow: Metallurgiya, 192 p. [in Russian].
2. Kharchenko, A.V., Sinyakov, R.V., Lichkonenko, N.V. (2017). Application of the Gibbs method of chemical potentials in ferrous
metallurgy. Metallurgy: Proceedings of Zaporizhzhya State Engineering Academy, iss. 2 (38), pp. 20–25 [in Russian].
3. Kharchenko, A.V., Sinyakov, R.V. (2016). Thermodynamic model of a multicomponent liquid slag phase. Metallurgy:
Proceedings of Zaporizhzhya State Engineering Academy, iss. 2 (36), pp. 16–22 [in Russian].
4. Kharchenko, A.V., Lichkonenko, N.V., Goryainova, N.V. (2012). Secondary alloying and refining of steel in ladle furnace units.
Metallurgy: Proceedings of Zaporizhzhya State Engineering Academy, iss. 1 (26), pp. 17–21 [in Russian].
5. Kharchenko, A.V., Laptev, D.A., Lupol, D.A. et al. (2014). Experimental studies of the technology of secondary electrothermal
alloying and refining. Metallurgy: Proceedings of Zaporizhzhya State Engineering Academy, iss. 1 (31), pp. 30–35 [in Russian].
6. Kharchenko, A.V., Kirichenko A.G., Belokon, Yu.A. et al. (2015). Thermodynamics and kinetics of the process of secondary
electro-thermal alloying and metal refining. Metallurgy: Proceedings of Zaporizhzhya State Engineering Academy, iss. 1 (33),
pp. 9–13 [in Russian].
7. Kharchenko, A.V., Lichkonenko, N.V. (2016). Secondary electro-thermal alloying and refining of a metal with the participation
of the gas phase. Metallurgy: Proceedings of Zaporizhzhya State Engineering Academy, iss. 1 (35), pp. 9–13 [in Russian].
8. Kharchenko, A.V., Sinyakov, R.V. (2017). Secondary electro-thermal alloying and refining of steel. Proceedings of XV All-
Ukrainian Scientific-Practical Conference "Special metallurgy: yesterday, today, and tomorrow", KPI im. Igor Sikorsky,
04/11/2017, Kyiv, pp. 1208–1218 [in Russian].
9. Kharchenko, O.V., Sinyakov, R.V., Vodennikov, S.A., Lichkonenko, N.V. (2019). Method of out-of-furnace steel processing.
Ukrainian Patent no. 132087, MPK: С21С 7/06 (2016.01), u201809172. State Register of Patents Ukraine on the useful model
02/11/2019, zaiavl. 06.09.2018; opubl. 11.02.2019, Biul. no. 3, 5 p. [in Ukrainian].
10. Lupis, K. (1989). Chemical thermodynamics of materials. Moscow: Metallurgiya, 503 p. [in Russian].