We selected duplex stainless steel type SAF2507 for heat exchanger tubes to resist stress corrosion cracking (SCC) in the third stage of a carbon dioxide compressor. Tube side is high conductivity (5,000 ppm) cooling water while shell side is carbon dioxide gas and the expectation is at shutdown carbon dioxide will be converted to carbonic acid. Is our selection SAF2507 correct?
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Re: Is Duplex Alloy 2507 a good choice?
1 September 2011 at 1:29pmDuplex Alloy 2507 represents at step up in corrosion resistance from austenitic stainless steels like 316L, especially if chloride induced corrosion (e.g., SCC) is a concern. According to the ASM Handbook of Corrosion Data (2nd Edition), duplex stainless steels have been used extensively to handle wet carbon dioxide. Without knowing any further details about your specific application that would lead me to think otherwise, I suspect duplex alloy 2507 is a good choice.
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