Optimization of chemical composition and melting technology of 20Г2АФ steel

Authors

  • V. I. Bolshakov State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”, Ukraine https://orcid.org/0000-0003-0790-6473
  • O. V. Uzlov State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”, Ukraine https://orcid.org/0000-0003-1329-5576
  • H. V. Drozhevskaya State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”, Ukraine https://orcid.org/0000-0001-5781-285X
  • M. A. Puchykov State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”, Ukraine

Keywords:

20Г2АФ type steel, mine workings shore up, nitrogen containing ferroalloys, optical microscope, vanadium nitrides

Abstract

Purpose of the study. To determine the possibility of optimizing the chemical composition of 20Г2АФ steel within the range of standardized composition in order to reduce the consumption of ferroalloys and to increase the complex of mechanical properties of rolled products. Methodology. Investigation of the structural state of hot-rolled steel for the mine workings shore up was carried out using light microscopes Neophot 32 and Axiovert 200M MAT with AxioVision 4.6.3 software. The grain size was assessed in accordance with GOST 5639 by comparison with reference scales, stripes - according to GOST 5640, non-metallic inclusions - according to GOST 1778. Results. The optimization of the chemical composition of 20Г2АФ steel within the range of standardized composition was carried out. Recommendations have been developed that allow reducing the consumption of nitrogen-containing ferroalloys at the melting process of 20Г2АФ steel. Provided data on the influence of the basic alloying elements of 20Г2АФ steel on the mechanical properties of rolled products. Scientific novelty. It was found that at the melting process of 20Г2АФ steel the substantial saving in nitrogen-containing ferroalloys can be achieved while increasing the standardized mechanical characteristics of finished rolled products. Practical significance. The developed recommendations allow to significantly reduce the consumption of nitrogen-containing ferroalloys per ton of 20Г2АФ steel. Thus, it is possible to reduce the cost price of steelmaking of 20Г2АФ steel in industrial conditions. At the same time, due to the increasing the set of standardized mechanical characteristics of the mine workings shore up produced from 20Г2АФ steel, it is possible to replace it with a lighter by weight profile. This will ensure a substantial saving of metal and funds for the end-user of rolled products.

 

Author Biographies

V. I. Bolshakov, State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”

Department of Materials Science, Dr. Sc. (Tech.), Prof.

O. V. Uzlov, State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”

Department of Materials Science, Cand. Sc. (Tech.), Ph. D., Ass. Prof.

H. V. Drozhevskaya, State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”

Department of Materials Science, assistant

M. A. Puchykov, State Higher Education Establishment “Pridnіprovsk State Academy of Civil Engineering and Architecture”

Department of Materials Science, student

References

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Узлов И. Г. Высокопрочная термически упрочненная микролегированная конструкционная сталь для вагоностроения / И. Г. Узлов, А. В. Пучиков, О. В. Узлов и др. // Металлургическая и горнорудная промышленность. – 2013. – № 2. – С. 51–54. − Режим доступа : http://www.metaljournal.com.ua/metal-gp2-2013/

Uzlov O. V. Investigation of acicular ferrite structure and properties of C − Mn − Al − Ti − N steels / O.V. Uzlov, A. Malchere, V.I. Bolshakov, C. Esnouf // Advanced Materials Research. – Switzerland : Trans Tech Publ., 2007. – Vol. 23. – Pp. 209–212. − Режим доступа : http://www.scientific.net/AMR.23.209

Большаков В. И. Роль нитридов алюминия и карбонитридов титана при получении структуры игольчатого феррита в низколегированных конструкционных сталях / В. И. Большаков, О. В. Узлов, А. В. Пучиков // Металлургическая и горнорудная промышленность. – 2005. − № 2. − С. 59−62. − Режим доступа : http://www.metaljournal.com.ua/mgp-02-2005/

REFERENCES

Bolshakov V.I., Uzlov O.V., Klushnik U.A., Zotov D.S. and Uzlova L.V. Termicheskaya obrabotka ekonomno legirovannih konstrukzionnih staley kak vozmozhnost polucheniya nedorogogo prokata [Heat treatment sparingly alloyed construction steels as the possibility of obtaining low-cost rolled metal]. Metaloznavstvo ta termіchna obrobka metalіv [Metallurgy and heat treatment of metals]. 2006, no. 2, pp. 27−31. (in Russian).

Uzlov I.G., Puchikov A.V. and Uzlov O.V. Visokoprochnaya termicheski uprochnennaya konstrykcionnaya stal dlia vagonostroeniya [High-strength hardened microalloyed structural steel for car building]. Metallurgicheskaya i gornorudnaya promyshlennost' [Metallurgical and Mining Industry]. 2013, no. 2, pp. 51−54. (in Russian).

Uzlov O.V., Malchere A., Bolshakov V.I. and Esnouf C. Investigation of acicular ferrite structure and properties of C−Mn−Al−Ti−N steels. Advanced Materials Research. Switzerland: Trans Tech Publ., 2007, vol. 23, pp. 209–212.

Bolshakov V.I., Uzlov O.V. and Puchikov A.V. Rol nitridov alyuminiya i karbonitridov titana pri poluchenii struktury igolchatogo ferrita v nizkolegirovannykh konstruktsionnykh stalyakh [The role of aluminum nitride and titanium carbonitride in obtaining acicular ferrite structure in a low-alloy structural steels]. Metallurgicheskaya i gornorudnaya promyshlennost' [Metallurgical and Mining Industry]. 2005, no. 2, pp. 59–62. (in Russian).

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Published

2017-12-23

Issue

No. 4 (2017): Metal Science and Heat Treatment of Metals

Section

Technical science

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