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This is a Experimental Study study.

October 10, 2025

Fracture Toughness and Fatigue Crack Growth Characteristics of X65 Linepipe and the Girth Welds Under Hydrogen Gas

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Fracture toughness significantly decreased with rising hydrogen gas pressure up to 10 MPa, and stabilized at higher pressures.
Fatigue crack growth rate (FCGR) under 10 MPa hydrogen pressure was ten times faster than under atmospheric nitrogen pressure.
Hydrogen embrittlement caused more severe damage at high temperatures compared to lower temperatures, affecting integrity.
The estimated fatigue life for pipelines exceeds one million cycles, implying adequate longevity under specified conditions.

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Implication

Observational analysis shows reduced fracture toughness and accelerated crack growth in X65 girth welds under hydrogen, indicating risks for pipeline integrity.

Cite This Study

Kiyokawa et al. (2025) studied this question.

synapsesocial.com/papers/68e8619c7ef2f04ca37e4355 https://doi.org/10.1115/pvp2025-153076

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Implication

Observational analysis shows reduced fracture toughness and accelerated crack growth in X65 girth welds under hydrogen, indicating risks for pipeline integrity.

Fracture Toughness and Fatigue Crack Growth Characteristics of X65 Linepipe and the Girth Welds Under Hydrogen Gas

Key Points

Discussion

Implication

Cite This Study

Fracture Toughness and Fatigue Crack Growth Characteristics of X65 Linepipe and the Girth Welds Under Hydrogen Gas

Key Points

Discussion

Implication

Cite This Study

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