PSI - Issue 20

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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ScienceDirect

Procedia Structural Integrity 20 (2019) 143–147

1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) The analysis of the causes of efficiency decrease in the metal of liquefied gas pipeline under the conditions of corrosive environmental exposure Sleptsov O.I. a, *, Ermakov B.S. b , Ermakov S.B. b , Shaposhnikov N.O. b a Larionov Institute of the Physical-Technical Problems of the North of the Siberian Branch of the RAS (IPTPN), department of welding technology and metallurgy, Oktyabrskaya St, 1, Yakutsk, 677890, Russian Federation b Peter the Great St.Petersburg Polytechnic University, Politekhnicheskaya St, 29, St. Petersburg, 195251, Russian Federation Migration of gas and oil production facilities to remote northern regions of the country, increase in the unit capacity of the equipment set the task of increasing the service life and reliability of equipment for the extraction and transportation of gaseous and liquid media. One of the main reasons for the accelerated failure of equipment is the corrosion effect of transported media. In this work, the effect of corrosion under stress on the performance of the main metal and welded joints of stainless pipes of austenitic-grade chromium-nickel steels has been studied. It is shown that the rate of the anodic process increases as the level of plastic deformation increases and the rate of growth depends on the degree of imperfection of the structure of the material. It has been established that the heat-affected zones of assembly welded joints of austenitic steels are the most prone to corrosion cracking, and the requirements for restoring the structure of heat treatment of the weld are not fulfilled. Refusal of heat treatment leads to the appearance and growth of carbide particles in the structure of the heat-affected zone, which reduces almost by a factor of two, from 270 to 150 MPa, the level of stresses, leading to the occurrence of corrosion cracking in welded joints. 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) The analysis of the causes of efficiency decrease in the metal of liquefied gas pipeline under the conditions of corrosive environmental exposure Sleptsov O.I. a, *, Ermakov B.S. b , Ermakov S.B. b , Shaposhnikov N.O. b a Larionov Institute of the Physical-Technical Problems of the North of the Siberian Branch of the RAS (IPTPN), department of welding t chnolo y and metallurgy, Oktyabrskaya St, 1, Yakutsk, 677890, Russian Federation b Peter the Great St.Petersburg Polytechnic University, Politekhnicheskaya St, 29, St. Petersburg, 195251, Russian Federation Abstract Migration of gas and oil production facilities to remote northern regions of the country, increase in the unit capacity of the equipment set the task of increasing the service life and reliability of equipment for the extraction and transportation of gaseous and liquid media. One of the main reasons for the accelerated failure of equip ent is the corrosion effect of transported media. In this work, the effect of corrosion under stress on the performance of the main metal and welded joints of stainless pipes of austenitic-grade chromium-nickel steels has been studied. It is shown that the rate of the anodic process increases as the level of plastic deformation increases and the rate of growth depends on the degree of imperfection of the structure of the material. It has been established that the heat-affected zones of assembly welded joints of austenitic steels are the most prone to corrosion cracking, and the requirements for restoring the structure of heat treatment of the weld are not fulfilled. Refusal of heat treatment leads to the appearance and growth of carbide particles in the structure of the heat-affected zone, which reduces almost by a factor of two, from 270 to 150 MPa, the level of stresses, leading to the occurrence of corrosion cracking in welded joints. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers

Keywords: liquefied gas pipelines; stainless steels; welded joints; corrosion cracking Keywords: liquefied gas pipelines; stainless steels; welded joints; corrosion cracking

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 2452 3216 © 2019 Th Author(s). Publis d by lsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers * Corresponding author. Tel.: +7 (4112) 39-06-02; fax: +7 (4112) 33-66-08. E-mail address: oisleptsov@mail.ru * Corresponding author. Tel.: +7 (4112) 39-06-02; fax: +7 (4112) 33-66-08. E-mail address: oisleptsov@mail.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.130