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Multiple grades of stainless steel are already well proven for this type of environment, and are listed in technical standards such as the ASME Boiler and Pressure Vessel Code, and EN 13445-2. What these have in common is that they have an austenitic microstructure that enables them to operate at temperatures of as low as -273°C. Resisting hydrogen embrittlement The other big issue is the potential for hydrogen embrittlement of steels and metals in general. Sensitivity to hydrogen embrittlement varies, depending on the material. High-strength steel, titanium and aluminium alloys are all vulnerable to hydrogen embrittlement. Sensitivity also varies between different types of stainless steel. Austenitic stainless steels have higher resistance to hydrogen embrittlement than ferritic and martensitic alloys, as hydrogen’s rate of diffusion through the material is low. Therefore, along with the low-temperature ductility, this makes austenitic stainless steel a good option for…9ee448d -
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