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<p>Transport of gaseous hydrogen through the existing Ukrainian gas pipeline network intensifies the risk of pipeline integrity disruption due to potential hydrogen embrittlement manifestation in ductile pipe steels, which is linked to a reduction in their crack growth resistance. This study describes the application of the <i>J</i>-integral method, a method of nonlinear fracture mechanics, for estimating the fracture toughness of 17G1S pipe steel (API 5L X52 type) that has been operated for thirty-eight years in the gas pipeline. Beam specimens with a lateral bending crack have been tested at different loading rates after preliminary electrochemical hydrogen charging. The obtained experimental results have indicated a significant effect on the steel fracture toughness, attributable to both hydrogen charging and active loading rate of the specimen. The effects of hydrogen embrittlement have been analyzed in terms of the stress-strain state in the vicinity of the crack tip and hydrogen transport mechanisms in the steel.</p>

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Assessing Hydrogen Embrittlement of Gas Pipeline Steels Using Fracture Mechanics Approaches

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • H. M. Nykyforchyn,
  • O. I. Zvirko,
  • O. T. Tsyrulnyk,
  • O. I. Venhryniuk

摘要

Transport of gaseous hydrogen through the existing Ukrainian gas pipeline network intensifies the risk of pipeline integrity disruption due to potential hydrogen embrittlement manifestation in ductile pipe steels, which is linked to a reduction in their crack growth resistance. This study describes the application of the J-integral method, a method of nonlinear fracture mechanics, for estimating the fracture toughness of 17G1S pipe steel (API 5L X52 type) that has been operated for thirty-eight years in the gas pipeline. Beam specimens with a lateral bending crack have been tested at different loading rates after preliminary electrochemical hydrogen charging. The obtained experimental results have indicated a significant effect on the steel fracture toughness, attributable to both hydrogen charging and active loading rate of the specimen. The effects of hydrogen embrittlement have been analyzed in terms of the stress-strain state in the vicinity of the crack tip and hydrogen transport mechanisms in the steel.