Tag: Alloy 330 fasteners for high temperatures

Inconel Bolts for High Temperature

Q: I have an application that needs an alloy to withstand 2100° F with no preload. Would Hastelloy be a good choice?
A: Probably not. Hastelloy fasteners have a max usable temperature of 1500°F and is primarily used for corrosion resistance. For these temperatures Inconel bolts are a better choice as it is more stable at higher temperatures. If you have no corrosion resistant chemicals present you could also use Alloy 330 fasteners.

Inconel bolts vs Alloy 330 at high temps

Q: I’m designing a furnace vent system for a continuous service high heat appliance (NFPA 211). The maximum furnace working temperature is 2100 deg F; design temperature is 2190 deg F. Will Alloy 330 or 310 SS bolts and nuts work for me?

A: You are at the absolute limit in terms of temperature for these fasteners for 310 or 330. (see https://www.extreme-bolt.com/applications-high-temperature.html).  To determine if the fasteners will work in your application you need to understand the load that is required on each fastener.  At those high temperatures, the fasteners will be weak so you must be careful about what is needed from a strength point of view.  You might want to also consider Inconel 600.