The ASME B31.12 standard includes a list of materials in Annex 6.1 that are suitable for hydrogen piping. If you want to use materials not on this list, you must conduct tests to ensure they meet the standard's requirements, including checks on mechanical

The ASME B31.12 standard includes a designated list of materials in Annex 6.1 deemed suitable for hydrogen piping applications. When considering materials not specified on this list, it is incumbent upon the user to conduct comprehensive testing to ascertain compliance with the standard's requirements. This includes evaluating mechanical properties, the manufacturing process of the pipes, applicable heat treatments, and overall quality control measures. It is noteworthy that certain European steel grades (EN) not included in ASME B31.12 may still be exempt from additional testing, provided they already demonstrate favorable mechanical properties. Additionally, it is important to recognize that ASME B31.12 does not address potential impacts associated with moisture or hydrogen sulfide (H2S) present in the gas.