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