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  1. J

    Recreating an interesting hardened part.

    Thanks everyone! What a difference a day makes. I did a little more homework myself and found different hardness charts I could jump between. As many said, off the shelf 4140 or even the 1045 should work. They are in the same range as the cap untreated, and the trunnion is hardly hard at...
  2. J

    Recreating an interesting hardened part.

    I trying to choose a steel to re-create an old car suspension part. The original (a trunnion cap) will not file, indicating that it is hard or hardened. When tested it showed Rc4, which should definitely file. Looking at spark test charts my best guess is that it is mild steel. The mating part...