Tag: Alloy 330 screws for cyclic temperatures

Alloy 330 for 1000C in Cyclic Conditions

Q: Looking for a fastener to bolt together two HAST-X sheets that will be used as part of a furnace fixture assembly. Furnace will be used at temperatures up to 1000°C with cycling from 20°C to 1000°C and back to 20°C over a period of 2 days. This will be happening continuously as part of a production firing process. Any ideas?

A: For this temperature Inconel 600, 310 stainless steel and Alloy 330 can all handle temperatures to 1000C, but the differentiator is the thermal cycling. For this specific issue combined with the high temperature, I would recommend you look at Alloy 330. Alloy 330 bolts are often used in high temp furnaces for their resistance to thermal shock from repeated quenching. They can handle huge temperature swings as well as provide resistance to oxidation and carburization.

A286 Bolts and Alloy 330 Bolts for Cyclic High Temperatures

Q: I need some suggestions on bolting for an application that is running at 610 degree C in a thermal cycling environment (Room temperature to 610 deg C). Is A286 a good fit?
A: This will depend a bit on the loads you are dealing with, but one of the best materials to look at for high temperature cycling would be A286. A286 bolts offer high strength, as well as creep and oxidation resistance to about 700°C.  Another choice would be Alloy 330 bolts. Alloy 330 fasteners are known for their ability to withstand cyclic temperature environments and are usable to around 1100C but not nearly as strong as A-286 fasteners. These two options are some of the best choices for furnace applications.