Galling in stainless steel plates
Galling in stainless steel plates
(OP)
Can someone advise: we are using 2 machined stainless steel 316 surfaces to transmit loading of a subsea unit (not ideal I know!). These surfaces will rotate relative to each other at a high contact load, albeit at low speed. In assembling the unit the surfaces have become damaged (scored). They have been repaired by locally buffing/ grinding any protruding metal. The concern is that the surfaces are no longer perfectly flat and that galling (metal pick-up) will occur. My approach would be to hone the local damaged areas using an oil stone. An alternative would be to 'scrape away' any proud anomolies (identified by hi-spot blue). My concern with this is a scraper would generate tiny furrows which would allow build-up of hard fines (present where this is used) between the surfaces and consequently promote galling. I'd be grateful for any advice on this!





RE: Galling in stainless steel plates
Table XII on page 25 has some representative galling pressures for various materials, unlubricated. I do not know if seawater is a significant lubricant.
Dry some recipes of Stainless-on-stainless can be quite prone to galling. Like, they can only handle a few ksi without galling.
Is this a proven successful design, except for the new surface damage?
I'd think the application of some kind of kind-to-the-fish dry lube or grease would help the plates wear-in and buff down significant high spots.
RE: Galling in stainless steel plates
RE: Galling in stainless steel plates
RE: Galling in stainless steel plates
You might then consider having one or both of the parts coated using Melonite which is generally used for guns but is an excellent coating to protect stainless steel and prevent galling.
RE: Galling in stainless steel plates
Works a treat.
RE: Galling in stainless steel plates
RE: Galling in stainless steel plates