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

[aroundhere]

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

 

[TVP]

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

 

[aroundhere]

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.

 

[EdStainless]

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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[unclesyd]

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.