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Influence of High-Pressure Hydrogen on Tensile Properties of Pipeline Steels Evaluated by Autoclave In Situ SSRT

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Abstract:

With search for clean and sustainable energy sources European union is determined to fully substitute natural gas with hydrogen in 2050. With these requirements it is really important to study materials used in existing gas infrastructure and evaluate their resistance to hydrogen embrittlement, which is common phenomena in material degradation. In this article, a comparative study was conducted using slow strain rate testing (SSRT) in situ at 10 MPa hydrogen pressure and tensile testing in air on X-52, X-60, and X-70 pipeline steels commonly used in Czech gas infrastructure. The results revealed reduction in elongation and a significant reduction in contraction in SSRT samples exposed to hydrogen compared to those tested in air, while yield and tensile strengths remained nearly unchanged. Furthermore, fracture morphology transitioned from ductile dimple to cleavage/quasi-cleavage. These findings suggest that hydrogen primarily affects the plastic properties of the materials, leading to a shift towards a lower energy fracture mechanism.

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Periodical:

Key Engineering Materials (Volume 1043)

Pages:

107-112

DOI:

https://doi.org/10.4028/p-Ss3pTt

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Online since:

February 2026

Authors:

Jan Kander*, Gabriela Rožnovská

Keywords:

High-Pressure Hydrogen, Pipeline Steel, SSRT, X-52, X-60, X-70

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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