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Mausingfield Actions?

Yeah after seeing this thread I watched a few videos from ARC explaining the design. Very interesting and well thought out ideas. I hope to have a play with one at some stage but they aren't very common over here
 
I found this article.


it seems their steel of choice is 4340.

The only thing would question is their RC hardness of 53. I am wondering if that is a miss print. 43 RC would seem more in line with the ideal properties of 4340.
 
I found this article.


it seems their steel of choice is 4340.

The only thing would question is their RC hardness of 53. I am wondering if that is a miss print. 43 RC would seem more in line with the ideal properties of 4340.

I‘m thinking with nitriding it’s brought the RC hardness up.
 
I‘m thinking with nitriding it’s brought the RC hardness up.
Maybe.

4340, while being a deep hardening steel known for it’s superior impact strength properties, barely quenches at much over 55 RC. Tempering to 53 RC results in a relative large decrease in ductility.

This might be a moot point, as the design engineer might have deemed that even at 53 RC, ductility might still be sufficient in this application.

Here is a typical heat treat chart for 4340 that shows how much ductility decrease as hardness rises.image.jpg
 

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