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  1. dpp8

    Carbon Equivelancy 4150

    Having an intermittent issue with hardening 3.5 in OD, varies in length of 4150 steel. Can not find any variables with heat treatment/quenching/tempering process. In furnace at 1520F for 4 hours, oil quenched and then tempered at 1020 for 4 hours. Can get low hardness on pieces from batch that...
  2. dpp8

    Flame Hardening Worm Gears.

    Flame hardening worm gears, question is how far beyond the lowest part of the last thread is it necessary to flame harden?
  3. dpp8

    Flame Hardening and Quench Time

    I am flame hardening 4150 steel that is being quenched in oil and then tempered in an oven. My question is does it matter how long the parts remain in the quench oil, or is there a recomended temperature that the parts should not fall below before they are taken out of the quench oil?

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