Replacing 17-4PH with Cold Drawn Nitronic 60?
Replacing 17-4PH with Cold Drawn Nitronic 60?
(OP)
I've been looking into a galling problem, and had some questions about Nitronic 60. The situation is two parts made of 17-4PH, H1025 condition, are in a high vibration environment, sliding tangentially against one another, and at worse case, can see a healthy amount of bearing pressure (30 ksi or so). They are cold welding themselves together. One of the parts has a Nibron coating, but it doesn't seem to be doing the trick. It seems to wear off quickly. Lubrication can't be used in this application.
I was thinking of trying to change the coated part (the only one I can change) to Nitronic 60, but in it's annealed state, it's considerably weaker then the 17-4PH it would be replacing. When cold drawn 30-40%, Nitronic 60's Ultimate and Yield Strengths are in the right ball park, and the hardness is similar to 17-4PH as well, which seemed promising. Are Nitronic 60's good galling and wear properties affected by cold drawing it? I haven't been able to find much info about it in it's non-annealed state.
Thanks for any help.
I was thinking of trying to change the coated part (the only one I can change) to Nitronic 60, but in it's annealed state, it's considerably weaker then the 17-4PH it would be replacing. When cold drawn 30-40%, Nitronic 60's Ultimate and Yield Strengths are in the right ball park, and the hardness is similar to 17-4PH as well, which seemed promising. Are Nitronic 60's good galling and wear properties affected by cold drawing it? I haven't been able to find much info about it in it's non-annealed state.
Thanks for any help.





RE: Replacing 17-4PH with Cold Drawn Nitronic 60?
RE: Replacing 17-4PH with Cold Drawn Nitronic 60?
N60 vs 17/4 (Rc43) wear is 5.4 mg/1000 cycles
N60 vs 17/4 (Rc32) wear is 4.9 mg/1000 cycles
Using Nitronic 60 HS @ Rc 29
N60 HS vs 17/4 (Rc43) wear is 3.7 mg/1000 cycles
Galling (Threshold Galling Stress)
N60 vs 17/4 (Rc34) 50
N60 HS vs 17/4 (Rc43) 47+
N60 HS vs 17/4 (Rc34) 37
By The description of your problem you have several other variables in the equation, speed and the amount of time the additonal pressure is applied and how fast is it applied.