Abstract This paper seeks to address knowledge gaps regarding the stability of stainless steel and Inconel alloys to continuous high-temperature H2 exposure. Stainless steel 310 (SS310) and Inconel 625 (IN625) were continuously exposed to hydrogen at 450 °C and 900 °C for up to 33 days. Materials properties were periodically examined through tensile, Charpy impact, and three-point bend tests; microstructure was examined by electron microscopy and X-ray diffraction.
