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  1. sls2

    Re-Heat Treating 4140 Q&T Steel

    Thx Metengr 1. Heat uniformly to 1525/1575F 2. Hold one hour per inch of thickness 3. Quench in agitated oil at 140/170F 4. Temper at 950/1200F as required to achieve specified hardness (4 ranges to pick from) sls2
  2. sls2

    Re-Heat Treating 4140 Q&T Steel

    Ref:thread330-234493 Have reviewed existing threads on this subject. For 4140 rough machined parts (1/8" stock per side) around 1/2" to 1" thick wall we quench & temper to achieve say 140ksi ultimate minimum. In-process tensile tests on a prolongation or accompanying sample sometimes come in...

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