Thank you brimstoner. The temperature and pressure is 40-70 C and 200 psi respectively. The rotating part can be stressed up to 70% yield. I am concerned about potential hydrogen induced cracking. As far as welding is concerned, the foundry may need to perform weld repair of casting defects...
I am planning to use CA6NM heat treated to Brinell hardness of 300 – 350 HB for compressor casing and rotating elements to handle hydrogen gas of 85% to 99.9% purity. I would appreciate receiving any information or experience in using CA6NM or similar materials in hydrogen gas environment...
