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May 31, 2026Journal of Power System Engineering

Prediction of Fracture Toughness of API X65 Pipe Steel for Sour Condition Using Small Punch Test in Hydrogen Environment

Sang-Hyun Jung Jin-Ha Hwang Yun-Jae Kim Ki-Seok Kim Seung-Gun Lee

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Key Points

This study aims to predict the fracture toughness of API X65 pipe steel in sour conditions using small punch tests.
Conducted small punch tests in air and hydrogen environments (5, 10 MPa) on API X65 steel.
Applied equations to predict fracture toughness based on tensile properties and testing outcomes.
Used finite element analysis to simulate the small punch tests and verified results against tensile test data.
In air, the fracture toughness of sour-resistant steel was similar or lower than standard steel.
In hydrogen environments, the sour-resistant steel exhibited greater fracture toughness than standard steel.

Implication

Study predicts fracture toughness in API X65 steel under hydrogen conditions, indicating potential risks.

Abstract

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Cite This Study

Jung et al. (2026) studied this question.

synapsesocial.com/papers/6a2cf300faef96ed7f0558f5 https://doi.org/10.9726/kspse.2026.30.2.003

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Keep reading

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

1Fracture Toughness and Fatigue Crack Growth Characteristics of X65 Linepipe and the Girth Welds Under Hydrogen Gas2025 · 1 citations
2Welding X65 for Sour Service: Microstructural Evolution and Mechanical Degradation of Pulsed GMAW Joints in H2S EnvironmentsOriginal Research · 2026
3Preliminary Evaluation of the Influence of Hydrogen on the Fracture Toughness of an X65 Gas‐Transmission Pipeline Steel2024 · 22 citations
4Influence of X65 Girth Welding Parameters on Fracture Toughness in High Pressure Hydrogen2025 · 1 citations
5Coherent Sour Toughness Testing Across NACE Regions: Data Analysis Across Multiple Projects, Sources, and Environments With Guidance to Consistently Measure Meaningful Lower Bound Toughness Results2025

More related papers

Impact of Environmental Hydrogen Pressure on Fracture Toughness and Fracture Behavior of X65 Pipeline Steel Welded Joints2026
Effect of Automated Multi-Pass MAG Welding Parameters on the Fracture Toughness and Hydrogen Embrittlement Susceptibility of API 5L X70 Pipeline Steel2026
Assessing fracture toughness of vintage and modern X65 pipeline steels under in situ electrochemical hydrogen charging using advanced testing methodology2024

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