Journals →  Chernye Metally →  2022 →  #9 →  Back

Metallology and physics of metals
ArticleName Investigation of changes in the structure of heat-resistant iron-containing chromium-nickel alloy as a result of long-term operation
DOI 10.17580/chm.2022.09.08
ArticleAuthor V. F. Petrova, S. O. Gevlich, E. A. Pozhilova
ArticleAuthorData

Volgograd State Technical University, Volgograd, Russia:

V. F. Petrova, Cand. Eng., Associate Prof., Dept. of Materials Technology, e-mail: tecmat@vstu.ru
E. A. Pozhilova, Undergraduate Student, Dept. of Materials Technology, e-mail: tecmat@vstu.ru

 

Volgograd State Technical University, Volgograd, Russia1 ; EKSPERTIZA Ltd., Volgograd, Russia2:

S. O. Gevlich, Cand. Eng., Associate Prof., Dept. of Materials Technology1, Technical Director2, e-mail: sgevlich@mail.ru

Abstract

Pyrolysis furnaces operate in harsh temperature and power conditions. Radiant coils are the most vulnerable part in their design. The coil pipe operates in two modes: operational - at a constant pressure and temperature not exceeding 1050 °С, and cleaning mode, which is characterized by increased pressure and higher temperature (about 1100 °С) compared to the operating one, which leadsto a thermal force effect. Such operating conditions of coil pipes lead to changes in the structure and properties of the material. In this regard, chromium-nickel steels are widely used for the manufacture of coils, and for operation at higher temperatures (1000-1050 °C), the content of chromium and nickel is increased, obtaining iron-containing chromium-nickel alloys, to ensure a stable austenitic structure. Identification of the dominant damaging mechanism makes it possible to determine the remaining resource and replace the coils in time to prevent possible emergencies. It is obvious that structural changes in the pipe metal will have a decisive influence on the performance of the structure as a whole. This paper presents the results of a study of the influence of some operational factors on the state of the metal of pipes of a standard furnace coil made of heat-resistant iron-containing chromium-nickel alloy. A change in the matrix microstructure in the form of partial homogenization of austenite was revealed. The fact of the occurrence of carbide reactions has been established. The presence of an oxidation zone mainly along the boundaries of dendrites was revealed, and the main types of oxides were determined. The dominant damaging mechanism of radiant tubes during operation has been determined.

keywords Microstructure, alloyed austenite, heat resistance, heat-resistant alloy, chromiumnickel alloy, oxidation, aging, carburization, destruction
References

1. Elmanovich V. I., Gevlich S. О. Mechanisms of damage to technological equipment of chemical, petrochemical and oil refining industries. Moscow: Metallurgizdat, 2010. 112 p.
2. Tukhvatullina R. А., Suleymanov I. N. Diagnostics of the technical condition of intra-production pipelines. The development of modern science: theoretical and applied aspects: a collection of articles by students, undergraduates, graduate students, young scientists and teachers. Edited by Т. М. Sigitov. Perm: IP Sigitov Т. М., 2018. pp. 23, 24.
3. Ruokang Song, Sujun Wu. Microstructure evolution and residual life assessment of service exposed Cr35Ni45 radiant tube alloy. Engineering Failure Analysis. 2018. pp. 63–72.
4. Jingfeng Guo, Congqian Cheng, Huifang Li, Jie Zhao, Xiaohua Min. Microstructural analysis of Cr35Ni45Nb heat-resistant steel after a five-year service in pyrolysis furnace. Engineering Failure Analysis. 2017. pp. 625–633.
5. Centralloy® G 4852 Micro material data sheet. Designation: GX45NiCrSiNb45-35. Data Sheet for information only. Available at: https://www.schmidt-clemens.com/fileadmin/sc-downloads/werkstoffdatenblaetter/WST_4852_Micro_161109.pdf (accessed: 11.08.2022).
6. Khimushin F. F. Heat resistant steels and alloys. Moscow: Metallurgiya, 1969. 752 p.
7. Tolorayya V. N., Bukhanova А. А., Rykova Т. P., Vertogradskiy V. А. Hot-strength and heatresistant nickel-based steels and alloys. Moscow: Nauka, 1984. 244 p.
8. Betteridge W. Superalloys (translated from English). Moscow: Metallurgizdat. 1961. 381 p.
9. Oryshenko А. S., Kondratyev S. Yu., Anastasiadi G. P. et. al. Features of structural changes in the 45Kh26N33S2B2 heat-resistant alloy at operating temperatures. Message 2: Influence of high temperature exposure. Nauchno-tekhnicheskie vedomosti Sankt-Peterburgskogo gosudarstvennogo politekhnicheskogo universiteta. 2012. No. 1. pp. 217–228.
10. Jingfeng Guo, Tieshan Cao, Congqian Cheng, Xianming Meng, Jie Zhao. Effect of carburization (pyrolysis furnace tube main failure factor) on the microstructure and properties of HPNb alloy tube. Engineering Failure Analysis. 2020. Vol. 115. p. 104610.
11. Mobaraki M., Afshang B., Rahimpour M. R., Bahrololoom M. E., Bolhasani A. et al. Effect of cracking feedstock on carburization mechanism of cracking furnace tubes. Engineering Failure Analysis. 2020. Vol. 115. p. 104216.
12. Ebrahimi E., Sanjabi A. Report of reformer tube inspection by long range guided wave ultrasonic method (gw), metal magnetic memory (mmm), eddy currents (et), time-of-flight diffraction (tofd), magnetoscopy, hardness test and metallography. Indian Journal of Fundamental and Applied Life Sciences. 2016. Vol. 6. pp. 370–380.
13. Dobrotvorskiy А. М., Balutov А. V., Denisenko Е. P. et. al. Coils of technological furnaces of oil refining industries. The main features of operation, technical diagnostics and analysis of the technical condition. Khimicheskaya tekhnika. 2016. No. 1. p. 20.
14. Mueller F., Scholz A., Berger C. Crack behaviour of 10Cr steels under creep and creep-fatigue conditions institute of materials technology. ECCC Creep Conference, 2005. London: Darmstadt University of Technology.
15. Dobrotvorskiy М. А., Maslikova Е. I., Andreeva V. D. Influence of operational factors on the structure of the material of coils of technological tube furnaces. Zavodskaya laboratoriya. Diagnostika materialov. 2015. Vol. 81. No. 9. pp. 32–40.
16. Anastasiadi G. P., Kondratyev S. Yu., Oryshenko А. S., Fuks М. D. Influence of the cooling rate during technological thermal cycling on the long-term strength of the 45Kh26N33S2B2 cast heat-resistant alloy. Nauchno-tekhnicheskie vedomosti Sankt-Peterburgskogo gosudarstvennogo politekhnicheskogo universiteta. 2013. No. 2. pp. 109–119.
17. Rudskoy А. I., Anastasiadi G. P., Oryshenko А. S., et. al. Features of structural changes in the 45Kh26N33S2B2 heat-resistant alloy at operating temperatures. Message 3: Mechanism and kinetics of phase transformations. Nauchno-tekhnicheskie vedomosti Sankt-Peterburgskogo gosudarstvennogo politekhnicheskogo universiteta. 2012. No. 3–2. pp. 143–150.
18. Petrova V. F., Pozhilova Е. А., Elmanovich V. I. Study of structural changes in a heat-resistant chromium-nickel alloy after long-term operation. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta. 2022. No. 2. pp. 77–82.
19. GOST 5639-82. Steels and alloys. Intr. 01.01.1983.
20. Anastasiadi G. P., Kokorina А. V., Kondratyev S. Yu. Study of the oxidation process of the Fe-25Cr-35Ni-0.45C-Si-Nb hot-strength heat-resistant alloy. Nauchno-tekhnicheskie vedomosti Sankt-Peterburgskogo gosudarstvennogo politekhnicheskogo universiteta. 2014. No. 3. pp. 161–169.
21. Anastasiadi G. P., Kondratyev S. Yu., Fuks М. D. High-temperature oxidation of the 45Kh26N33S2B2 hot-strength heat-resistant alloy. Nauchno-tekhnicheskie vedomosti Sankt-Peterburgskogo gosudarstvennogo politekhnicheskogo universiteta. 2013. No. 4-1. pp. 199–209.
22. Kondratyev S. Yu., Petrov S. N., Anastasiadi G. P., Tsemenko А. V. Structural features of hightemperature oxidation of HP40NbTi cast heat-resistant alloy. Part I. Kinetics of oxidation. Metallovedenie i termicheskaya obrabotka metallov. 2020. No. 1. pp. 35–46.
23. Tao Chen, Xuedong Chen, Chunjiao Liu, Zhichao Fan. Failure analyses of centrifugal casting ethylene pyrolysis furnace tubes from microporosity defects. Engineering Failure Analysis. 2019. Vol. 102. pp. 318–326.

Language of full-text russian
Full content Buy
Back