Q: I need a material that can stay oxidation resistant at 2000F in a cyclic temperature environment. Any suggestions?
A: One of the best choices is Inconel 601, UNS N06601,which is highly resistant to oxidation up to 2200°F and can handle even severe thermal cycling. These Inconel bolts will offer good high temperature strength and retain ductility after long service exposure. Also an excellent choice would be an Alloy 330 bolt. They offer oxidation and carburization resistance to 2100F – just over your requirement. Alloy 330 bolts are also known for their ability to withstand cyclic conditions of temperature extremes from heating and cooling. Which fastener is better, Inconel or Alloy 330, will depend on your strength requirements at temperature.

Q: Can you tell me the difference between alloy 330 and 310 stainless fasteners? I’d like a more economic alternative to the 330 but didn’t know if 310 stainless could be used instead. I have extreme cyclic conditions running to about 2000F?

A:
If cyclic conditions are a concern you may want to stick with the alloy 330 bolts to be safe. 310 stainless steel fasteners are more economical, than 330 but with slightly less strength and temperature resistance. For these alloys the primary difference between them is their ability to perform in thermal cycling situations. Alloy 330 bolts are known for their ability to perform in these cyclic conditions of heating and cooling. In terms of operational temperature limits these materials are similar with 310 stainless steel bolts having a max usability of 2000F where alloy 330 bolts can be used up to 2100 F.