What does this research mean for the field?

Hydrogen significantly reduces the fracture toughness of X70 pipeline steel in the circumferential-longitudinal orientation, while having a minor influence in the circumferential-radial orientation. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To examine the effects of hydrogen and specimen orientation on the fracture toughness and strength of X70 pipeline steel.

February 26, 2026International Journal of Hydrogen EnergyOpen Access

Influence of hydrogen and orientation on the fracture toughness and strength of X70 pipeline steel

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To examine the effects of hydrogen and specimen orientation on the fracture toughness and strength of X70 pipeline steel.
Measured fracture toughness following ASTM E1820 using single edge-notched bend specimens.
Conducted tests in air and under electrochemical hydrogen charging at 9 or 25 mA/cm² for 72 hours.
Used two specimen orientations: circumferential-radial (C-R) and circumferential-longitudinal (C-L).
In C-R orientation, fracture toughness with hydrogen ranged from 114-348 kJ/m², comparable to 184-214 kJ/m² in air.
C-L orientation showed significant reduction in toughness with hydrogen, measuring 27 ± 11 kJ/m².
Hydrogen reduced ductility without significant strength loss, indicating potential for safe hydrogen service.

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Implication

Investigates how hydrogen and specimen orientation affect the strength and toughness of X70 pipeline steel, suggesting implications for safe hydrogen service.

Cite This Study

Karimi et al. (2026) studied this question.

synapsesocial.com/papers/699fe37b95ddcd3a253e7536 https://doi.org/10.1016/j.ijhydene.2026.154110

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Implication

Investigates how hydrogen and specimen orientation affect the strength and toughness of X70 pipeline steel, suggesting implications for safe hydrogen service.

Influence of hydrogen and orientation on the fracture toughness and strength of X70 pipeline steel

Key Points

Discussion

Implication

Cite This Study

Influence of hydrogen and orientation on the fracture toughness and strength of X70 pipeline steel

Key Points

Discussion

Implication

Cite This Study

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