With the development of renewable energy, hydrogen energy is paid more and more attention. Hydrogen is an excellent energy carrier, but it is difficult to store and transport because of its special properties. Hydrogen blended with nature gas is considered to be the best transition solution to solve the problem of large-scale hydrogen transportation. But hydrogen embrittlement occurs when the pipeline steel used to transport natural gas is exposed to hydrogen environment. Referencing to ASME B31.12, X42 pipeline steel is selected as the research object in this paper. And the mechanical properties of X42 were tested by electrochemical hydrogen charging, slow strain rate tensile (SSRT) test, fatigue crack growth test combined with thermal desorption spectroscopy (TDS) and SEM. Hydrogen solubility of X42 pipeline steel at room temperature was determined by TDS, and the equivalence between high pressure hydrogen charging and electrochemical hydrogen charging was verified. SSRT test showed that the strength of X42 increased slightly in electrochemical hydrogen charging environment, but the plasticity decreased significantly, and the embrittlement degree of materials increased with the increase of current density. Then fatigue crack growth test showed that the presence of hydrogen will accelerate the crack growth rate and reduce the fatigue life of materials. SEM images of tensile and fatigue specimens showed that hydrogen transforms the fracture mode from ductile fracture to cleavage fracture.


Study on Hydrogen Resistance of X42 Pipeline Steel  Under Eelectrochemical Hydrogen Charging Condition

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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