Q: I have a process that is running at high temperatures that can fluctuate up to 1500F that requires not only oxidation resistance but also some chemical resistance contaminants. I had tried some C276 bolts for the stray acids but they don’t seem to be working mechanically…suggestions?

A: A good bolt to try may be an Inconel 625 bolt. They can handle much higher temperatures up to about 1800F. These Inconel bolts also can provide excellent oxidation resistance and can also provide protection against reducing chemicals like stray acid contaminants.

Q: I need a bolt that can handle a chemical processing situation where there are not only corrosive chemicals but also high temperatures that can fluctuate. Max temp is around 1200F. What would you suggest?

A: Not knowing the chemicals you are using makes it tough, but for high temperature corrosive environments Inconel 625 bolts may be a good fit. They are usable to about 1800F and can handle many chemicals. If you are exposing these bolts to strong oxidizers, high acid acid concentrations or hydrofluoric acid, let me know because we’ll need to re-evaluate the material because Inconel 625 may not be the right fit.