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Screwing 17-4 stainless & nitronic 50 and galling issues.

Screwing 17-4 stainless & nitronic 50 and galling issues.

Screwing 17-4 stainless & nitronic 50 and galling issues.

(OP)
I am trying to find a replacement for 17-4 that will screw into another part made of 17-4. We currently copper plate the threads (to prevent galling)when screwing 2 parts of 17-4 together, but the copper plate does not last when the tool is being broke down to replace seals almost daily. Would nitronic 50 be a good choice? The yeild stength is about half of h-1075, but this would not be an issue for this part. I read that nitronic 60 has better anti-galling properties, but my machine shop has some nitronic50 in stock. thanks for any suggestions/feedback

RE: Screwing 17-4 stainless & nitronic 50 and galling issues.

Is there a reason you cannot use a lubricant over the copper plating?

RE: Screwing 17-4 stainless & nitronic 50 and galling issues.

(OP)
Here in the shop, we always use lubricant. Its the guys in the field that are in a hurry that never take the time to use it. Basicly, you have to assume they will not use lubricant.

RE: Screwing 17-4 stainless & nitronic 50 and galling issues.

How different are the strength levels of your two 17-4 parts?  That should be a good combination, provided they are different.
If you cut threads on Nit50 you will have some issues.  Rolled threads will work much better.

I am sorry that the guys in the field are negligent.  I was in the oilfiled equipment business and we simply prohibited the re-use of any fasteners.  The field kits of new bolts were all silver plated and pre-lubed.  The time saved was worth the cost.

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RE: Screwing 17-4 stainless & nitronic 50 and galling issues.

It has been my experience that you will far less galling problems using Nitronic 60 instead of the Nitronic 50  We have numerous applications where we changed materials from N50 (22-13-5) to N60 to lower the incidences of galling on threaded components.   

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