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S. V. Panin, P. O. Marushchak, I. V. Vlasov, A. V. Eremin, A. V. Byakov, A. S. Syromyatnikova, R. Stankevich

STRUCTURE AND FATIGUE DURABILITY OF 09Mn2Si PIPE STEEL AFTER LONG-TERM OPERATION IN FAR NORTH CONDITIONS

DOI: 10.17804/2410-9908.2017.4.081-085

A comprehensive study of the structure and fatigue durability of the 09Mn2Si steel used for constructing the Mastakh-Berge-Yakutsk main gas pipeline (taken from the linear part with an outer diameter of 530 mm and a wall thickness of 7mm) after 37 years of operation is carried out. A comparative analysis of the results obtained for the emergency stock steel is made. It is shown that long-term operation does not give rise to a substantial redistribution of cementite. Deformation aging is slightly expressed, and it is manifested through the precipitation of finely dispersed carbides in the grain bulk. The revealed structure degradation practically does not make sense under static tension or hardness measurement. At the same time, under cyclic testing, the microstructure degradation occurring during long-term operation results in a fatigue lifetime decrease, especially at the stage of crack initiation.

Acknowledgments: The study was supported by the fundamental research program of Russian state academies of sciences for 2013–2020, rfbr projects no. 15-08-05818, and by grants from the headquarters of the russian academy of sciences on arctic research.

Keywords: pipe steel, fatigue durability, structure degradation

References:

  1. Nykyforchyn H., Lunarska E., Tsyrulnyk O.T., Nikiforov K., Genarro M.E., Gabetta G. Environmentally assisted “in-bulk” steel degradation of long term service gas trunkline. Engineering Failure Analysis, 2010, vol. 17, No. 3, pp. 624–32. DOI: 10.1016/j.engfailanal.2009.04.007
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  3. Bolshakov A.M. Methods for analysis of the remaining service life of pipelines and pressure vessels operating at low climatic temperatures. Chemical and Petroleum Engineering, 2012, vol. 47, No. 11, pp. 766–769.
  4. Syromyatnikova A.S. Degradation of physical and mechanical condition of the main gas pipeline metal at long operation in the conditions of the cryolitozone. Phys. Mesom., 2014, vol. 17, pp. 85–91.

 

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Article reference

Structure and Fatigue Durability of 09mn2si Pipe Steel after Long-Term Operation in Far North Conditions / S. V. Panin, P. O. Marushchak, I. V. Vlasov, A. V. Eremin, A. V. Byakov, A. S. Syromyatnikova, R. Stankevich // Diagnostics, Resource and Mechanics of materials and structures. - 2017. - Iss. 4. - P. 81-85. -
DOI: 10.17804/2410-9908.2017.4.081-085. -
URL: http://eng.dream-journal.org/issues/2017-4/2017-4_164.html
(accessed: 05/22/2024).

 

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Chief Editor:  S.V. Smirnov
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