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In-Service Degradation of Pipeline Steels

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Degradation Assessment and Failure Prevention of Pipeline Systems

Part of the book series: Lecture Notes in Civil Engineering ((LNCE,volume 102))

Abstract

Long-term operation of structural steels causes an essential decrease of the mechanical properties, especially characteristics of brittle fracture and SCC resistance. General regularities of in-service degradation of pipeline steels are analysed in the chapter. On these base two stages of pipeline steels degradation are distinguished in the chapter. The first one is deformation aging which is characterized by improvement of characteristics of strength and hardness but from the other hand a decrease of plasticity and brittle fracture resistance. The stage II is the stage of in-bulk steel dissipated microdamaging, which is more dangerous with regard to a loss of pipeline integrity. Operational degradation of the mechanical properties of the steels is accelerated by their hydrogenation from the inner surface of the pipe, which indicates the hydrogenating ability of transported hydrocarbons. The accelerated method of pipeline steels degradation is substantiated. It is based on the common method of deformation ageing of steels by plastic strain with subsequent heat treatment up to 250 °C, however, it additionally involves preliminary hydrogen charging.

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Acknowledgements

This research has been supported by the NATO in the Science for Peace and Security Programme under the Project G5055.

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Authors and Affiliations

  1. Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv, Ukraine

    Hryhoriy Nykyforchyn

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  1. Hryhoriy Nykyforchyn
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Correspondence to Hryhoriy Nykyforchyn .

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Editors and Affiliations

  1. Dipartimento di Ingegneria Civile e Ambientale, Politecnico di Milano, Milano, Italy

    Gabriella Bolzon

  2. Oil&Gas Sector, Milano, Italy

    Giovanna Gabetta

  3. Karpenko Physico-Mechanical Institute, National Academy of Sciences of Ukraine, Lviv, Ukraine

    Hryhoriy Nykyforchyn

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Nykyforchyn, H. (2021). In-Service Degradation of Pipeline Steels. In: Bolzon, G., Gabetta, G., Nykyforchyn, H. (eds) Degradation Assessment and Failure Prevention of Pipeline Systems. Lecture Notes in Civil Engineering, vol 102. Springer, Cham. https://doi.org/10.1007/978-3-030-58073-5_2

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  • DOI: https://doi.org/10.1007/978-3-030-58073-5_2

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-58072-8

  • Online ISBN: 978-3-030-58073-5

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