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  1. machinemanvf

    Proper callouts for heat treating 4340

    Thanks to all for the help, I have talked to the h.t. and we are going with a salt bath for tempering. Should be able to get to 48 without cracking.
  2. machinemanvf

    Proper callouts for heat treating 4340

    Thank you for the quick reply, I am going to speak to the h.t. today, FYI, part is a complex configuration with several deep (.3 in) pockets and webs, there are generous radii in both the floor and sides of the pockets, and yes, I am concerned about cracking. Another question, what is the...
  3. machinemanvf

    Proper callouts for heat treating 4340

    Hi all, I am making some 4340 components that need to be 46 - 50 HRC when done, what callout do I give the heat treater?

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