nitronic 60 level 3 (high strength) question

[aroundhere]

I have a downhole tool that im using 3 screws at 120deg to hold the tool together. The threads are 10-32 and the supporting diameter is .375. They screw into a HS nitronic50, so galling is something to consider. Nitronic60 is good for anti galling. I havent found a toughness charpy test, but I believe it is high. The tool doesnt have to be Nace certified, but I want to use the most corrosion resistant material I can. My question is....if I use a level 3 nit60, which has a yield strength of 130ksi, does the corrosion resistance suffer dramatically from cold working? The annealed NIT60 has good corrosion resistance, but needed a little higher yield strength than the annealed. I havent worked much with nitronic 50 either, so im not sure what materials I can screw into the nit50 that galling would not be a factor. Also, ive heard that nit60 is tough to machine. Any input on that would also be great.

 

[EdStainless]

Small screws, highly stressed, in a well environment?
How about cold worked 625?
At high strength these alloys are not bad to machine.
But then you are rolling the threads, correct?
Use a good anti-seize on the threads either way.

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