Tag: Inconel 600 screws for high temperatures

Inconel 600 Bolts vs. Inconel 601 Bolts

Q: Can you tell me what the difference is between Inconel 600 and 601? I need a material for high temperature thermal cycling.
A: Both Inconel 600 and Inconel 601 bolts are oxidation resistant at  high temperatures. The main difference is that Inconel 600 bolts have a maximum usable temperature of 2000°F, where Inconel 601 screws can be used at higher temperatures up to 2200°F. In addition, Inconel 601 bolts perform well in cyclic temperature conditions.
Another material to consider for cyclic conditions would be Alloy 330 which is very oxidation and carburization resistant to 2100°F. Plus,  Alloy 330 bolts are known for the ability to perform in cyclic conditions of temperature extremes.

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.