Galling resistant stainless - proprietary alloys
Galling resistant stainless - proprietary alloys
(OP)
I've been exploring "galling resistant" stainless alloys. Nitronic 60, Gall-Tough, and Gall-Tough PLUS are all being considered. The melt chemistries of Nitronic 60 and Gall-Tough PLUS are similar with the exception of manganese limits. Data sheets also list the UNS S21800 designation for both these alloys so I assume both fall within the composition limits for that designate. The original Gall-Tough grade appears to be the only one on the market of its kind and therefore a single source material.
Anyone familiar with Nitronic 60 & Gall-Tough PLUS to comment on the equivalence (or difference) of the two in terms of galling resistance against, say, 17-4 stainless in the H900 condition. I'd like to have two sources for the UNS S21809 stainless, but only if I can convince myself that these two alloys are equivalent for all intents and purposes.
Anyone familiar with Nitronic 60 & Gall-Tough PLUS to comment on the equivalence (or difference) of the two in terms of galling resistance against, say, 17-4 stainless in the H900 condition. I'd like to have two sources for the UNS S21809 stainless, but only if I can convince myself that these two alloys are equivalent for all intents and purposes.





RE: Galling resistant stainless - proprietary alloys
RE: Galling resistant stainless - proprietary alloys
If the parts are small you might want to look at some Co based alloys (low carbon ones). They have extremely good gall resistance, and a price to go along with it.
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Plymouth Tube
RE: Galling resistant stainless - proprietary alloys
blacksmith37: Although I'm not presently interested in independently characterizing galling resistance, I did come across ASTM G98-02(2009) Standard Test Method for Galling Resistance of Materials in case anyone else is interested. It looks like the first issue was 1991, so maybe too early to use to generate the data in Carpenter's and Armco's literature for Gall-Tough (PLUS) and Nitronic 60, respectively.
I am trying to put my best foot forward in terms of stainless steel alloy selection to give be a good shot at mitigating galling without the used of lubricants. I especially want to keep my options open by avoiding single source alloys - like Gall-Tough. Turns out Nitronic 60 is the more available of the two UNS S21800 alloys, so it looks like my choice has been made up for me as to which to try first.
Ed: I'll see how Nitronic 60 performs and see if I need to cast my net out further to capture Co, Cu, or Ni based alloys. Any recommendations on a Co based alloy for future consideration?
RE: Galling resistant stainless - proprietary alloys
The third link is for information on the QPQ nitrocarburizing process. Using this process I've had outstanding results using nitrided 17/4 versus Nitronic 60. I have one application,drum and sleeve, in split case horizontal pumps used in acidic service that have been running running for 30 years. There are three pumps with two one stream 24/7/365 with one swinging to take up any slack. The pumps are are rotate yearly.
Of the Stellite alloys we use mainly alloy 6 and 12.
Will you application allow Copper based alloys?
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RE: Galling resistant stainless - proprietary alloys
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Plymouth Tube
RE: Galling resistant stainless - proprietary alloys