How to consider the issue of hydrogen embrittlement in the materials for high-pressure hydrogen pipelines
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It is generally believed that transporting hydrogen at room temperature does not require special consideration; hydrogen embrittlement occurs only at around 300 degrees Celsius. However, some people believe that hydrogen can cause hydrogen embrittlement at room temperature, on the grounds that at such temperatures the balance between hydrogen molecules and hydrogen atoms in H2 remains intact; as a result, hydrogen atoms can enter the steel, and their accumulation can lead to hydrogen embrittlement. Currently, we are building a hydrogenation plant, and we are wondering how to select appropriate materials for high-pressure hydrogen pipelines operating at temperatures below 200 degrees Celsius
The hydrogen-containing pipelines in hydrogenation units are generally made of 321 material and require post-weld heat treatment.
The hydrogenated vaseline device I have seen was designed by the Fushun Research Institute, and it uses 1Cr18Ni9Ti
.......using Cr-Mo steel