Hi-Temp Stainless Thread Lube
Hi-Temp Stainless Thread Lube
(OP)
We have a 304-bodied slide valve that bolts up to pipe flanges using tapped holes in the body. Valve runs at about 1100°F for 1 to 4 months. Bolting currently in use is also 304 s/s.
We have tried Milk of Magnesia, FelPro C5A never-seize, and ceramic coating the bolts. Nothing works well. Suggestions, please?
We have tried Milk of Magnesia, FelPro C5A never-seize, and ceramic coating the bolts. Nothing works well. Suggestions, please?





RE: Hi-Temp Stainless Thread Lube
RE: Hi-Temp Stainless Thread Lube
Personally, I don't like paste type anti-seize compounds for use on screw threads with most applications. Primarily because the anti-seize paste gets wiped off the thread contact surfaces it is supposed to prevent from seizing during installation. A dry-film coating like moly disulfide, some type of plating like silver, or coatings like IVD aluminum work better since they are more durable and are far less likely to be scraped from the thread surfaces during installation.
RE: Hi-Temp Stainless Thread Lube
After you change the bolt metallurgy, that needs to be done.
But at 1100F you cant use a cold worked bolt. A 17-4PH with H1150 heat treatment would work, or A286 (alloy).
You could also try boron nitride. I never left any for that long but it did work (coating both the hole and bolt) for a few weeks at 1000F.
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P.E. Metallurgy, Plymouth Tube
RE: Hi-Temp Stainless Thread Lube
WE used this treatment for tolling used up to 1150degC.