Tag: High temperature bolts

316 for High Temperatures

Q: I don’t see 316 on your sight but would you know if 316H material can be useed at 1500F?

A: I believe 316H will survive 1500F without significant oxidation. However, please be aware, at that temperature, the material will lose a significant % of its strength. The material already starts out at the very low end of material strengths. At 1500F, you may get <10% of the tensile strength from the material.

So, although 316H will not oxidize from the temperature, we still would not recommend it as a fastener due to the low strengths at those temperatures.

Here is a page on high temperature fasteners that can be used at 1500F and beyond:

https://www.extreme-bolt.com/applications-high-temperature.html

Incoloy Bolts for High Temperatures

Q: I have a need for a high temperature bolts that will be used in continuous heat at about 1000F. Any suggestions? Also, will fluctuations in temperature cause breakage?

A: One of the best materials for long-term continual exposure to high temperatures are Incoloy bolts. The Incoloy 800 series will probably work for your applications, providing you aren’t utilizing the bolts in high concentration acids. Incoloy 800HT bolts offer the one of the best high temperature properties for this class of alloy and has a max operating limit of about ~1500F.