Objective Laws of Nitrogen Removal in the Vacuum Tank Degasser

Abstract:

This article discusses the problems of efficient removal of nitrogen in the vacuum tank degasser operating at the electric arc furnace shop of Uralskaya Stal (Ural Steel) OJSC in the course of manufacturing of high-quality low carbon steel grades by means of steel grades «2» and «T». In order to determine the reasonable and balanced treatment parameters that ensure the required level of nitrogen content in the above steel grades, an analysis of production data for the period of November-December 2016 has been carried out. This analysis is the basis for identifying the vacuum degassing parameters in compliance with the technological capabilities and well-balanced levels, which allow predicting the level of nitrogen content in steel. To assess the cumulative quantitative effect of the main parameters of vacuum degassing on nitrogen removal, there has been performed a regression analysis. As a result, there have been obtained multiple regression equations describing a rational combination of steel treatment parameters for achieving the required nitrogen removal level.

• Periodical: Materials Science Forum (Volume 989)
• Pages: 381-387
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.989.381
• Online since: May 2020
• Authors: Vlasta D. Tutarova*, Aleksey N. Shapovalov, Alexander N. Kalitaev
• Keywords: Argon Flow Rate, Duration of Vacuum Treatment, High Vacuum, Nitrogen, Steel Degassing, Steel Temperature in the Ladle, Tank Degasser, Vacuum Tank

References

[1] V.A. Kudrin Theory and technology of steel making: Textbook for institutions of higher education, Moscow, MIR, «Publishing House AST» LLC, (2003).

[2] A.N. Morozov, M.M. Strekalovskiy, G.I. Chernov, Ya.E. Kanzelsohn Liquid Steel Degassing, Moscow, Metallurgy, (1975).

[3] A.M. Bigeyev Steel Metallurgy. Theory and technology of steel melting. Magnitogorsk, Magnitogorsk State Technical University, (2000).

DOI: 10.17580/cisisr.2016.02.02

[4] D.A. Dyudkin, V.V. Kisilenko Modern technology oа steel making, Moscow, Heat Engineer, (2007).

[5] A.N. Shapovalov, V.D. Tutarova, A.N. Kalitaev Improvement of vacuum degassing technology of axle steel grades at the Electric Arc Furnace Shop of Ural Steel OJSC, Casting Processes, 12 (2003) 93-103.

[6] A.N. Kalitaev, V.D. Tutarova, A.N. Shapovalov, D.O. Bazhukov The problem of forming of high-quality continuous cast steel round billets in the continuous casting machine, News Bulletin of institutions of higher education. Ferrous Metallurgy, 5 (2013) 27-32.

DOI: 10.17073/0368-0797-2013-5-27-32

[7] E.V. Shevchenko, A.N. Shapovalov The problem of manufacturing of the high-quality slab in Continuous Casting Machine №2 of Ural Steel OJSC, News Bulletin of the South Urals State University, «Metallurgy» series, 13(1) (2013) 68-73.

[8] V.D. Tutarova, A.N. Shapovalov, A.N. Kalitaev Removal of hydrogen in the vacuum treatment of steel, Steel in Translation, 47:3 (2017) 153-158.

DOI: 10.3103/s0967091217030159

[9] A.N. Morozov Hydrogen and Nitrogen in Steel, Moscow, Metallurgy, (1968).

[10] W.Yang, X.Wang, L.Zhang, Q.Shan and X.Liu, Cleanliness of Low Carbon Aluminum‐Killed Steels during Secondary Refining Processes, Steel research int., 84:8 (2013) 473-489.

DOI: 10.1002/srin.201200213

[11] A.N. Smirnov, V.M. Safonov Vacuum Degassing of Steel: technology, equipment, Electrometallurgy, 11 (2008) 8-14.

[12] A.O. Nikolayev, V.A. Bigeyev, O. A.Nikolayev, D.K. Chigasov Particular characteristics of vacuum degassing of tube steel grades at the Oxygen Converter Shop of Magnitogorsk Iron and Steel Works OJSC, Electrometallurgy, 4 (2013) 19-24.

[13] E.G. Zhitlukhin, V.V. Meling, L.E. Dresvyankina, A.G. Gudov, I.A. Stepanov. Mastering and enhancement of efficiency of steel vacuum degassing technology, Steel, 6 (2014) 12-14.

[14] A.V. Protasov, B.A. Sivak, A.V. Lukyanov, A.S. Nikitenko, N.A. Shchyogolev. The condition and aspects of the ladle degassing of liquid steel, Ferrous Metallurgy, 11(1331) (2010) 38-44.

[15] E. Ardelean, T. Hepuț, M. Vătășescu, E. Crișan. Researches Regarding the Influence of Vacuum Parameters on the Efficiency of Gas Removal from the Liquid Steel, Solid State Phenomena, 254 (2016) 218-223.

DOI: 10.4028/www.scientific.net/ssp.254.218

[16] A. Socalici, E. Popa, T. Heput, F. Drăgoi. Researches Regarding the Improvement of the Steel Quality. Solid State Phenomena, 216 (2014) 273-278.

DOI: 10.4028/www.scientific.net/ssp.216.273

[17] S. Yu, J. Miettinen, S. Louhenkilpi. Numerical Study on the Removal of Hydrogen and Nitrogen from the Melt of Medium Carbon Steel in Vacuum tank degasser, Materials Science Forum, 762 (2013) 253-260.

DOI: 10.4028/www.scientific.net/msf.762.253

[18] K. Steneholm, M. Andersson, A. Tilliander, P.G. Jönsson. Removal of hydrogen, nitrogen and sulphur from tool steel during vacuum degassing, Ironmaking & Steelmaking, 40:3 (2013) 199-205.

DOI: 10.1179/1743281212y.0000000029

[19] H.J. Wu, Q.Q. Li, Z. Wang, F.J. Jiang. Vacuum denitrification and nitrogen absorption of molten steel under ultra-low nitrogen conditions. Materials Science and Technology, 35:2 (2019) 240-246.

DOI: 10.1080/02670836.2018.1559005

[20] Yu S., Miettinen J., Shao L. and Louhenkilpi S., Mathematical Modeling of Nitrogen Removal from the Vacuum tank degasser. Steel research int., 86:5 (2015) 466-477.

DOI: 10.1002/srin.201400093