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Hardness for Impact Anvil?

  1. Nov 5, 2014 #1


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    I'm designing a tool that will be driven by an impacting peening gun. The peening gun will be act like a jack hammer with a flat tipped cylindrical anvil. The tool being hit will have a steel insert that will act to transfer the energy from the impacting peening anvil to the tool. I've done some research and it looks like S7 tool steel is about the best material for this type of impact. The question is, how hard should I harden the S7? I see it can be hardened up to RC58. My gut tells me somewhere around RC50 would be best. Note that we cannot have this insert "mushrooming" So we can't put an unhardened piece of steel in there, which sure, it won't fracture, but it will mushroom.
  2. jcsd
  3. Nov 10, 2014 #2
    Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
  4. Nov 11, 2014 #3


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    The spec sheet looks like you made a good choice.

    My gut feel tells me 48-52 HRc. No more than 55 HRc. But that is gut feel...

    Are you able to make some test anvils in a range of harnesses? That way you could do three, say 48, 52 and 58 and find the right balance between deformation and impact resistance.

    I would look at case hardening if S7 doesn't work.
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