Q: I have an high temperature exhaust application that requires about 130ksi of tensile strength and is running pretty hot at 1000F. There are also some low concentration acidic contaminants that condense on the bolts during shutdowns, that have caused corrosion in the past on standard 316 bolting. Would A286 work with this? It says it is mildly corrosion resistant.
A: An A286 screw is mainly used for high temperature / high strength applications that require oxidation resistance. ex would perform from a corrosion point of view in a very similar way to the 316 stainless steel bolts however it may be VERY difficult for you to differentiate if your “corrosion” problem is due to oxidation of the bolts or your mild acid or both. A286 bolts may solve your oxidation problem, which may be the initial cause of your “corrosion” problems as 316 is not very oxidation resistant. It may be a good test to do, if you can swap out some bolts