Inconel 718 combination with f44 austenitic stainless steel 1

[mada23]

Hello,

I'm working on a butterfly valve but we had to change the materials of the valve. We choosed to use Inconel 718 for the shaft and a F44 stainless steel for the bearings but we have really no informations about the galling characteristics of these two materials. They are two very hard steel but we have never used them together and even searching everywhere on the internet I haven't been able to find informations about the combination of these materials.
I would like to know if you have had some experience with these materials and/or if you have further informations about their combination or even about their galling characteristics.

Thank you in advance, Simone

 

[metengr]

Probably one of the best sources of information

http://www.nickelinstitute.org/~/Me...lingCharacteristicsofStainlessSteel_9006_.pdf

 

[SSfix]

Simone-
I believe when you are going to have any high friction metal on metal contact you will eventually experience galling. The more austenitic the material is the better to have reduced galling.

I do know there are processes to help improve the galling resistance of stainless steel as well like Kolsterization.

 

[XL83NL]

Kolsterizing is one, S3P by Bodycote is another (also by Bodycote).

 

[SSfix]

Absolutely correct XL83NL-

I can actually help in the Bodycote contact info department if needed

 

[EdStainless]

Mada, which one do you expect to be the wear component? One will wear.
The F44 is just a 6%Mo superautinitic stainless, it has a fairly low yield strength.
You could roller burnish it so that the surface is harder, but which one wears is still the question.
Neither of these alloys have any real lubricity.
Have you though of a high strength bronze insert?

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P.E. Metallurgy, Plymouth Tube

 

[SSfix]

Ed are you with Plymouth Tube in KY?

 

[EdStainless]

No, I am corporate supporting the stainless side of the business.
Do you deal with Hopkinsville?

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P.E. Metallurgy, Plymouth Tube

 

[SSfix]

I used to more when I worked in Aerospace and I did know they were interviewing for an outside sales associate a few months back as well. But I live in TN close and have family in Bowling green so not to far away from that location.