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Jianhui Metals Group 4140

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Jianhui Metals Group 4140 hot work die steel is with good machinability, good processing resistance to deformation, and anti-fatigue performance,It  is a medium hardenable mold steel.


Jianhui Metals Group 4140 alloy steel , will have a good strength and good comprehensive mechanical properties after heat treatment . It sloa has good manufacturability and high rate of output.

Jianhui Metals Group  4140 die steel is a high strength low alloy steel. If to make non-plastic mold, it will need no polishing or no very fine texture treatment. Highest using temperature is 427 Celsius degrees.

4140 alloy steel is with  high strength , high hardenability, good toughness; quenching deformation is small.  there is a good resistance and lasting to strength lasting when working in high temperature. It is widely used in the manufacture of higher strength and higher quality quenched and tempered forgings. such as locomotive traction with a large gear, supercharger transmission gear, rear axle, connecting rod and spring clip which with great load. It can also be used for Oil deep well 2000m drill pipe joints and salvage tools.


4140 Chemical Composition(%)max
C Si Mn Cr Ni Mo P S Cu
0.40 0.25 0.65 1.1 0.3 0.2 0.035 0.035 0.30

Jianhui Metals Group 4140 alloy steel has good toughness and plasticity, at the same time, it has high strength. That means it has good comprehensive mechanical properties.

Performance and processing:

Tensile strength 1080

Yield strength:930


Section shrinkage ratio 45%

Akv (J): 63;

Hardness: 300HB / sample size: sample blank size is 25mm;

Jianhui Metals Group delivery status is generally heat treatment (normalizing, annealing or high temperature tempering), We also deliver the steel according to customer needs if you require delivery with no heat treatment.

Corresponding international standards grades: 42CrMo4, JIS: SCM440, DIN: 42CrMo4, GB: 42CrMo.