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Quantitative comparison of hydrogen embrittlementHydrogen embrittlement sensitivity between different pipeline steelPipeline steel types is an important basis for hydrogenHydrogen pipeline material selection. In this work, the hydrogen embrittlementHydrogen embrittlement susceptibility of two typical pipeline steelsPipeline steel has been quantitatively investigated by microstructureMicrostructure characterizationCharacterization, hydrogenHydrogen penetration experiments, and slow strain rate tensileSlow strain rate tensile tests. The results show that X80 is dominated by needle-fine shaped ferrite, while 5LB has coarse ferrite and pearlite composition. The hydrogenHydrogen diffusionDiffusion coefficients of 5LB and X80 are 1.67 × 10−5cm2·s−1 and 5.29 × 10–6 cm2·s−1, respectively. The equations of hydrogenHydrogen concentration and hydrogenHydrogen charging time in 5LB and X80 steels are 1.8t0.43 and 2.7t0.26, respectively. When the hydrogenHydrogen concentration is 2.6 μmol·cm−3, the hydrogen embrittlementHydrogen embrittlement index of 5LB and X80 are 4.7% and 15.5%, respectively. The differences in hydrogenHydrogen diffusionDiffusion coefficient and internal hydrogenHydrogen concentration due to microstructureMicrostructure are the key factors for the different hydrogen embrittlementHydrogen embrittlement susceptibility of the two pipeline steelsPipeline steel.

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Quantitative Investigation on Hydrogen Embrittlement Susceptibility of Typical Pipeline Steel Through Hydrogen Permeation and Slow Strain Rate Tensile Tests

  • 会议论文

  • 发表日期：

    2025年

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  • Songyuan Ai,
  • Lihua Wan,
  • Mujun Long,
  • Rundong Zhang,
  • Yifan Li,
  • Dengfu Chen,
  • Danbin Jia

摘要

Quantitative comparison of hydrogen embrittlementHydrogen embrittlement sensitivity between different pipeline steelPipeline steel types is an important basis for hydrogenHydrogen pipeline material selection. In this work, the hydrogen embrittlementHydrogen embrittlement susceptibility of two typical pipeline steelsPipeline steel has been quantitatively investigated by microstructureMicrostructure characterizationCharacterization, hydrogenHydrogen penetration experiments, and slow strain rate tensileSlow strain rate tensile tests. The results show that X80 is dominated by needle-fine shaped ferrite, while 5LB has coarse ferrite and pearlite composition. The hydrogenHydrogen diffusionDiffusion coefficients of 5LB and X80 are 1.67 × 10−5cm2·s−1 and 5.29 × 10–6 cm2·s−1, respectively. The equations of hydrogenHydrogen concentration and hydrogenHydrogen charging time in 5LB and X80 steels are 1.8t0.43 and 2.7t0.26, respectively. When the hydrogenHydrogen concentration is 2.6 μmol·cm−3, the hydrogen embrittlementHydrogen embrittlement index of 5LB and X80 are 4.7% and 15.5%, respectively. The differences in hydrogenHydrogen diffusionDiffusion coefficient and internal hydrogenHydrogen concentration due to microstructureMicrostructure are the key factors for the different hydrogen embrittlementHydrogen embrittlement susceptibility of the two pipeline steelsPipeline steel.