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  1. ttao

    4140 steel hardening

    I always meet the problem about hardening 4140 steel at my work. I used to induction or flame harden 4140 heat treaded and stress released (HTSR) steel to HRC 54-56 but someone told me I should use 4140 annealed steel because if I use pre-hardened material, I need anneal it first and then...

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