40CrMnMo steel commonly used in the manufacture of heavy duty, larger cross-section of the gear shaft, gear, truck rear axle axle, shaft, eccentric shaft, connecting rod, turbine similar parts, can also be used instead of 40CrNiMo.

After quenching and tempering, 40CrMnMo round steel has good comprehensive mechanical properties, good hardenability, and high tempering stability. Mostly used in quenched and tempered state. 40CrMnMo round steel is often used to manufacture heavy-duty, large cross-section gear shafts, gears, rear axle axles, shafts, eccentric shafts, connecting rods, and similar parts of steam turbines. It can also be used instead of 40CrNiMo round steel.