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1. Characterization of sensitivity to FPH under H2 pressure
1.1 Specific features of gas loading
In order to characterize the FPH sensitivity of a metal in the presence of H 2 pressure, it is necessary to use appropriate equipment guaranteeing the quality of the results obtained. Indeed, the latter can be significantly impacted by the following points (figure 1 ):
metal surface finish. Greater roughness results in greater sensitivity of the material to FPH. An oxide layer can also reduce the penetration of hydrogen into the material and reduce or mask the sensitivity of the material, leading to erroneous data;
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Characterization of sensitivity to FPH under H2 pressure
Reminders of FPH mechanisms
Bibliography
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- Transportable gas cylinders – Hydrogen embrittlement of steels - AFNOR FD E 29-649 - 2004
- Alternatives rules for construction of high pressure vessels, Boiler and Pressure Vessel Code - ASME Section VIII, Division III - 2019
- Transportable gas cylinders – Compatibility of cylinder and valve materials with gas contents – Part 4: Tests methods for selecting steels...
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