School of Non-Ferrous Metals and Materials Science, Siberian Federal University, Krasnoyarsk, Russia¹ ; Bratsk branch of ISO LLC, Russia²:

P. G. Krinitsin, Master’s Student¹, Reliability Manager², e-mail: alfa_reklama@mail.ru
A. G. Grinkevich, Master’s Student¹, Site Superintendent², e-mail: grinkevi4ag@gmail.com

Laboratory of Physics and Chemistry of Metallurgical Processes and Materials, Siberian Federal University, Krasnoyarsk, Russia:
A. S. Yasinskiy, Head of the Laboratory of Physics and Chemistry of Metallurgical Processes and Materials3, e-mail: ayasinskiykrsk@gmail.com

The work is aimed at the oxidative processes occurring in the metallic structures of the universal refrigerators “UKHB 3/30” used to transport and cool calcined coke. The temperature of the coke entering the device reaches 1320 ^oC. As it moves along the device, chemical and thermal effects occur on unprotected metallic structures with the formation of erosion centers and through damage to the shells. The service life of refrigerators hot-cut metallic structures made of A284 Grade B (ASTM) is 1 year, which determines its repairs frequency. Experiments on the oxidative processes in real conditions of operation of refrigerators were conducted for samples made of carbon steel of the A284 Grade B (ASTM) brand and heat-resistant high-alloy steel AISI 301. Changes in the chemical composition and physical parameters were determined in the samples. The thermogravimetric method for estimating the corrosion kinetics based on the sample mass loss, spectrometric study of metal samples, and classical chemical “wet” analysis were used. According to the results, the degree of corrosion damage of samples after 1,5 hours is estimated. The kinetics of corrosion has been studied. The mechanism of decarburization of the surface layer in A284 Grade B (ASTM) steel and the accompanying deterioration of the metal mechanical properties are described. An economic analysis of the feasibility of using AISI 301 steel to increase the service life of refrigerators was carried out.

1. Tverdokhlebova V. P., Khramenko S. A. Petroleum coke for aluminium industry. Technology and properties. Journal of Siberian Federal University. Chemistry. 2010. Vol. 4. pp. 369–386.
2. Lepesh G. V., Moiseev E. N. Analysis of techniques for protecting metal surfaces from high-temperature erosion. Technico-tehnologicheskie problemy servisa. 2017. Vol. 3, No. 41. pp. 20–31.
3. Umarova N. G. Understanding the effect of external and internal factors on the chemical corrosion of metals. Science and Education Today. 2016. No. 2, Iss. 3. pp. 38, 39.
4. Neverov A. S., Rodchenko D. A., Tsyrlin M. I. Corrosion and protection of materials. Moscow, 2007. 224 p.
5. Dwivedi D., Lepkova K., Becker T. Carbon steel corrosion: a review of key surface properties and characterization methods. The Royal Society of Chemistry. 2017. Vol. 7. pp. 4580–4610.
6. Neuharth J. J., Cavalli M. N. Investigation of high-temperature hydrogen embrittlement of sensitized austenitic stainless steels. Engineering Failure Analysis. 2014. Vol. 17. pp. 1028–1037.
7. Astafurova E. G., Astafurov S. V., Maier G. G., Moskvina V. A. et al. Hydrogen embrittlement of ultrafine-grained austenitic stainless steels. Reviews on Advanced Materials Science. 2018. Vol. 54. pp. 25–45.
8. Vernigorova V. N., Korolev E. V., Eremkin A. I., Sokolova Yu. A. Corrosion of building materials: Monograph. Moscow : Paleotip, 2007. 176 p.
9. Chernov A. A., Loshkarev N. B., Druzhinin G. M. Techniques for reducing metal losses during heating in industrial furnaces. Heat technology and computer science in education, science and industry. TIM’2017. 2017. pp. 155–158.
10. Calika A., Duzgun A., Sahin O., Ucard N. Effect of carbon content on the mechanical properties of medium carbon steels. Zeitschrift für Naturforschung A. 2010. Vol. 65, Iss. 5. pp. 468–472.
11. GOST 380–2005. Common quality carbon steel. Grades. Introduced: 01.07.2008.
12. Totten G. E. Steel heat treatment: Metallurgy and technologies. Oregon, U.S.A. : Portland State University, Portland, 2006. 848 p.
13. Pu-jie Zhao, Cheng Ma, Ji-tong Wang, Wen-ming Qiao et al. Almost total desulfurization of high high-sulfur petroleum coke by Na Na₂CO₃-promoted calcination combined with ultrasonicultrasonic-assisted chemical oxidation. New Carbon Materials. 2018. Vol. 33, Iss. 6. pp. 587–594.
14. Poyarkova E. V., Yakhin A. V. Effect of high temperatures on the structure of surface oxides in stainless steel. Tambov University Reports. Series: Natural and Technical Sciences. 2016. pp. 1267–1270.
15. Poyarkova E. V. Regularities of damage accumulation in high-temperature equipment: Monograph. Moscow : Flinta, 2016. 121 p.
16. Zavartsev N. A., Gafarov N. F., Sagidullin R. Z. Metal oxidation mechanisms and the effect of allotropy and temperature on oxidation kinetics: A review. Industry, agriculture, energy sector and infrastructure: Research papers. 2017. pp. 148–167.
17. GOST 5632–72. High-allоу steels аnd соrrosion-рrооf, heat-resisting and hеаt trеаtеd аllоуs. Grades. Introduced: 01.01.1975.
18. Jianbo Sun, Chong Sun, Xueqiang Lin, Xiangkun Cheng et al. Effect of chromium on corrosion behavior of P110 steels in CO₂ – H₂S environment with high pressure. Materials. 2016. Vol. 9, Iss. 3. p. 200.