Gear Steels Back
Gear Steels
  • Application Sun-Ring-Pinion Gear, Drive Gear, Front & Rear Differential Gear, Locomotive Gear…
  • Typical grade ASTM A36, 1045, 1144, 4121, 4140, 4320, 4340, 43B17, 8620, 8720, 18CrNiMo7-6, 8822, 9310, 42CrMo4, 20NiCrMo2-2, 30CrNiMo8, 34CrNiMo6, …
  • Description Standard Bar Stock Material and Hardness (< 24” Dia.)
    ——Thru-hardened, Nitriding (49 HRC max.) or Induction hardened steels (52 HRC max.)
    4140 Steel, 269-321 BHN → Hot rolled bar - 0.375 to 9.50 in. dia.
    4340 Steel, 320-388 BHN → Hot rolled bar - 1.00 to 9.50 in. dia.
    4340 Steel, 320-360 BHN → Forged bar - 10.0 to 24.0 in. dia.
    ——Special Nitriding steels for higher surface hardness (58 HRC or higher)
    31CrMoV9 (for 58 HRC hardness), 310-350 BHN
    Nitralloy 135 (for 60 HRC hardness), 270-310 BHN
    ——Carburizing steels
    4320 Steel, 220 BHN
    17CrNiMo6, 240 BHN
    9310 Steel, 220 BHN
    ——European grade available
    ——Clean steel
    ——Sound center
    ——Forge bar quality

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