Duplex 2205 and Hastelloy fasteners in pulp & paper digester

Q: We have a pulp & paper digester that is used to cook wood chips in an alkaline solution. The fasteners will be exposed to high temperatures and abrasive conditions. Any suggestions?

A: Without knowing the specifics of your process, I can make two general material suggestions. Duplex 2205 fasteners are often used in pulp and paper digesters for their high resistance to chloride stress corrosion cracking, as well as pitting and crevice corrosion. But keep in mind Duplex 2205 has a usable temperature limit of 572F. If you have harsher conditions or are are running at higher temperatures, Hastelloy C276 may be a better fit. C276 fasteners are also commonly used in digesters and are a good fit for more severe conditions. They can be used at operating temperatures up to 1900 F and are very resistant to chlorides, as well as hot, extremely caustic media.

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