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<p>This study investigates changes in the mechanical properties of the base metal and weld seam of strength-grade X70 electric-welded pipes, as well as their resistance to crack growth, following exposure to high-purity hydrogen at a&#xa0;pressure of 7 MPa. A&#xa0;comparison of the results of reference tests conducted in air with those conducted in hydrogen reveals a&#xa0;change in the tensile strength of the pipe base metal of 3–5%, and a&#xa0;change of 5–9% in the tensile strength of the weld seam. Hydrogen embrittlement is characterized by a&#xa0;degradation of plastic characteristics, including a&#xa0;5% decrease in relative elongation and an 11% reduction in area in the base metal, and by 22% and 23% reductions in the weld seam, respectively. The experimental results demonstrate that pressurized gaseous hydrogen reduces ductility and causes a&#xa0;more pronounced degradation of the mechanical properties in the weld seam compared to the base metal. Moreover, the study determined the threshold stress-intensity factor for the material in a&#xa0;hydrogen environment. Notwithstanding this degradation, the findings indicate that the pipe metal, with a&#xa0;wall thickness of up to 37 mm and manufactured using the appropriate technology, is suitable for transporting high-purity hydrogen at pressures up to 7 MPa, in compliance with steel product qualification criteria.</p>

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Mechanical properties of low-carbon pipe steel under the influence of pressurized hydrogen gas

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • A. S. Tsvetkov,
  • P. P. Stepanov,
  • A. Yu. Mikhalev,
  • A. V. Muntin,
  • S. E. Dagaev,
  • A. G. Nikolaeva

摘要

This study investigates changes in the mechanical properties of the base metal and weld seam of strength-grade X70 electric-welded pipes, as well as their resistance to crack growth, following exposure to high-purity hydrogen at a pressure of 7 MPa. A comparison of the results of reference tests conducted in air with those conducted in hydrogen reveals a change in the tensile strength of the pipe base metal of 3–5%, and a change of 5–9% in the tensile strength of the weld seam. Hydrogen embrittlement is characterized by a degradation of plastic characteristics, including a 5% decrease in relative elongation and an 11% reduction in area in the base metal, and by 22% and 23% reductions in the weld seam, respectively. The experimental results demonstrate that pressurized gaseous hydrogen reduces ductility and causes a more pronounced degradation of the mechanical properties in the weld seam compared to the base metal. Moreover, the study determined the threshold stress-intensity factor for the material in a hydrogen environment. Notwithstanding this degradation, the findings indicate that the pipe metal, with a wall thickness of up to 37 mm and manufactured using the appropriate technology, is suitable for transporting high-purity hydrogen at pressures up to 7 MPa, in compliance with steel product qualification criteria.