Inconel 625 Bolts For High Temperature Corrosion

Q: Is there a material you can recommend that can handle a high temperature exhaust stream which has trace corrosive chemicals? I’ve tried A286 bolting but am having some corrosion issues.

A: When a process demands high temperature corrosion resistance, depending on the temperature and amount of contamination, you might want to consider Inconel 625. Inconel 625 bolts have a max usable temperature of 1800F. They offer excellent resistance to many acids and chemicals including sulfuric acid. In terms of corrosion resistance they are just slightly less resistant than Hastelloy C276.

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