The order asked for was "4140 through hardened to HRC 35-40". Is this an incorrect callout? Do you have suggestions for better clarifying this next time?
To obtain the UTS needed for the application + SF, I used the lower end HRC35 to get my 158ksi value and the 5 points range would be gravy...
First post here thanks in advance for any assistance available.
2 3/16" dia round 4140.
I am trying to achieve HRC Value of 35-40 through hardened.
using the lower range of HRC-35, my numbers put a piece like this at:
158 ksi ultimate
140 ksi yield
and this required for my application...
