Stainles against Stainless threaded materials
Stainles against Stainless threaded materials
(OP)
Hi,
I'm looking for a good combination of stainless to stainless threaded materials that that will hold up well against wear and galling (Martensitic against Austenitic).
-High RPM's is not a factor.
-Lubrication is not allowed.
-Nitronic 60 has been considered for one element (Austenitic).
-15-5PH has been considered for the other element (Martensitic).
Though I believe Nitronic 60 against 15-5PH (let's say hardened to H900) will work well, I'm looking for advice on whether or not that's a good combination or what other good options I have.
I'm looking for a good combination of stainless to stainless threaded materials that that will hold up well against wear and galling (Martensitic against Austenitic).
-High RPM's is not a factor.
-Lubrication is not allowed.
-Nitronic 60 has been considered for one element (Austenitic).
-15-5PH has been considered for the other element (Martensitic).
Though I believe Nitronic 60 against 15-5PH (let's say hardened to H900) will work well, I'm looking for advice on whether or not that's a good combination or what other good options I have.
Thanks,
Sean





RE: Stainles against Stainless threaded materials
RE: Stainles against Stainless threaded materials
-Very low load conditions.
-Hex adjuster set screw/bushing set-up.
-M3 X 0.20 "extremely fine threads".
Design is for a kinematic optical fold mirror (small assy).
Very fine adjustments are made to adjusters by hand.
Thanks,
Sean
RE: Stainles against Stainless threaded materials
RE: Stainles against Stainless threaded materials
Your application sounds vaguely similar to the type of stuff I deal with and galling doesn't seem to come up often on the smaller threads though I can't think of any stainless on stainless that fine a pitch. However for some of our larger structural joints we will use anti galling compound.
That said for something that's routinely adjusted we tend to use a bushing not stainless on stainless so you're probably correct to be concerned.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Stainles against Stainless threaded materials
Thanks,
Sean
RE: Stainles against Stainless threaded materials
Although it will still wear over time, it starts off better.
Also, rather than making the bushing harder, is there any scope to make the screw softer?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Stainles against Stainless threaded materials
I think we want to look into harder materials at this point.
Thanks,
Sean
RE: Stainles against Stainless threaded materials
Just sold me some Nitronic 60.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Stainles against Stainless threaded materials
RE: Stainles against Stainless threaded materials
RE: Stainles against Stainless threaded materials
Thanks,
Sean
RE: Stainles against Stainless threaded materials
Shot peening is something that would be helpful in this respect where material similarities or combinations are a worry. The pin thread must by peened.
What type of thread are you using. What size? Keep pitch as large as possible. If premium tapered thread go to vendor.
You have a potentially serious galling problem. If these threads are heavily loaded...
You have to keep joints clean and lubricated. Otherwise pitting or crevice corrosion will become the issue (or cementing of parts along the threads of whatever the dried out mud may be present).
Recommned Nedox-SF2 or CR+ on Box thread.
Good Luck...
- CJ
RE: Stainles against Stainless threaded materials
It is a high strength copper alloy capable of yield strength
exceeding 100 ksi. Its high strength and low coefficient of friction make it well suited for use as a bushing and bearing material. It also out-performs many copper alloys and
nickel alloys in corrosive environments.
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- CJ