40CrMo has high strength and hardenability, good toughness, small deformation during quenching, and high high temperature creep strength and endurance strength. It can be used to manufacture forgings with higher strength and larger quenched and tempered section than 35CrMo steel, such as locomotive traction gear, supercharger transmission gear, rear axle, connecting rod under heavy load, spring clip, etc., and can also be used for drill pipe joints and fishing tools in deep wells below 2000 m. ..
The chemical composition of 40CrMo is as follows:
C:0.35~0.45
Si:0. 15~0.40
Manganese: 0.40-0.70
p:& lt； =0.035
s:& lt； =0.035
Cr: 1.00~ 1.50
Mo:0. 15~0.25