Stainless Galling Between Nitronic 60 and 17-4 or 4140
Stainless Galling Between Nitronic 60 and 17-4 or 4140
(OP)
I'm in the process of doing a material analysis on some downhole products for the oil and gas industry. We thread the pieces of this component together, and it see's around 30ksi of pressure (which is balanced both inside and outside the tube). Our problem has been galling between these pieces of the assembly. Currently, we use 17-4 PH stainless due to its high yield strength and relatively good corrosion resistance in our application. Our problem is the thread galling between the two parts due to the stainless being the same material between the two mating surfaces.
My question concerns this Nitronic 60. Its great material for sure, has about the same yield strength as our current material at a level 3 HT. But its expensive stuff. I am curious though if I can use it on every other part, so that one thread is 17-4 and one is Nitronic. Will it have the same anti-galling properties, and not suffer from any galvanic corrosion (it has a short life so I wouldn't expect it), or other issues. 4140 would work as well in place of the 17-4, though its corrosion resistance is lower.
Part of the problem is we need a very tough material for the application. Occasionally these parts will see a one time stress of up to 100ksi (or higher in stress concentration areas). Therefore we can't use something like the Gall-Tough because its too weak.
Thanks.
My question concerns this Nitronic 60. Its great material for sure, has about the same yield strength as our current material at a level 3 HT. But its expensive stuff. I am curious though if I can use it on every other part, so that one thread is 17-4 and one is Nitronic. Will it have the same anti-galling properties, and not suffer from any galvanic corrosion (it has a short life so I wouldn't expect it), or other issues. 4140 would work as well in place of the 17-4, though its corrosion resistance is lower.
Part of the problem is we need a very tough material for the application. Occasionally these parts will see a one time stress of up to 100ksi (or higher in stress concentration areas). Therefore we can't use something like the Gall-Tough because its too weak.
Thanks.





RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
Aaron Tanzer
www.lehightesting.com
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
Aaron, we currently use a proprietary grease that seems to be more of an assembly tool than anything. Doesn't make a lick of difference for galling at the stresses we're running.
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
There are real anti-size compounds. I have resorted to silver loaded Krytox grease in a pinch.
What HT condition is your 17-4PH?
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Plymouth Tube
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
I just can't get over how expensive Nitronic 60 is. The customer wants it, but doesn't want to pay for it...
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
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Plymouth Tube
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
Aaron Tanzer
www.lehightesting.com
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
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RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140
RE: Stainless Galling Between Nitronic 60 and 17-4 or 4140