Material selection for high-temperature equipment in wet hydrogen sulfide stress corrosion environments
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In recent projects, I have encountered a large number of high-temperature heat exchangers operating in environments subject to wet hydrogen sulfide stress corrosion; the design temperatures range from 425 to 480°C. Do any of you have experience in selecting materials for similar applications? Ordinary Q345R HIC steel plates can barely withstand temperatures of 425°C; at 480°C, they need to be replaced with 15CrMoR HIC. It seems there is little information available online about this, and is its price high? (Without considering the foreign stainless steel process package CS, and heat transfer is also calculated based on CS.) Additionally, how should the heat exchange tubes be selected? Still using 10# steel?
At this temperature, is the environment where the subject is located a wet hydrogen sulfide environment? I suggest you take a look at the definition of relevant wet hydrogen sulfide environments! It is defined in Petrochemical sh/t3193-2017!
Depending on the conditions, normal driving does not pose a problem of wet hydrogen sulfide stress corrosion. But are there wet hydrogen sulfide stress corrosion conditions during the driving phase? If it exists, considering surfacing S32168 with 15CrmoR should be considered.
15CrmoR HIC is definitely cheaper than stainless steel
It’s already over 400°C – where could there still be a humid hydrogen sulfide environment?
You might want to learn about corrosion-resistant Hastelloy materials