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  • Case Hardening 8620

    Don Hughes

    Member

    Updated: Oct 25, 2024
    Views: 973
    We have several pinion shafts made from 8620, approx 8" long with 1"-2" varying diameters. Parts are case hardened .050" depth, to Rc 62. We are looking to machine through the case on one of the diameters, to add a keyway, and then send out for re-carburizing and re-heat treatment. Is it possible to perform this re-heat treatment process without detrimental effects on the already case-hardened surfaces? Would we be required to mask off the rest of the part, and carburize only the keyway? Any feedback would be appreciated. thanks!
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  • Ramani Aswath

    Member • Dec 8, 2011

    If you spark erode the key ways can you leave them as is without carburizing again? Is there a definite need for it?
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