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A Brief Inroduction Of 40Cr Alloy Structual Steel

Shannxi Shew-E Steel Pipe Co.,Ltd | Updated: Jan 07, 2019


40Cr structural steel is one of the structual steels having wide application. Due to its good mechanical properties, 40Cr steel bar is widely used in the production of important quenched and tempered mechanical parts, such as gear shaft sleeve, connecting rod, screw, inlet valve, and the mold manufacturing industry such as medium plastic mold and mold structure parts such as mold frame.

After tempering and tempering, the 40Cr steel has good comprehensive mechanical properties, low temperature impact toughness and low notch sensitivity. Except quenching and tempering, 40Cr is also suitable for nitriding and high-frequency quenching. The hardenability of 40Cr steel is good, which can be reached to 28 ~ 60mm in water quenching and 15 ~ 40mm in oil quenching. When 174 ~ 229HBS, the relative machinability is 60%.

 

Chemical  Composition:

Standards

GB/T 3077

ASTM A322

JIS G4053

DIN 17200

Material

40Cr

5140 G51400

SCr440

41Cr4/1.7035

C

0.37~0.44

0.38~0.43

0.38~0.43

0.38~0.45

Si

0.17~0.37

0.15~0.35

0.15~0.35

≤0.40

Mn

0.50~0.80

0.70~0.90

0.60~0.90

0.60~0.90

P

≤0.035

≤0.035

≤0.030

≤0.035

S

≤0.035

≤0.040

≤0.030

≤0.030

Cr

0.80~1.10

0.70~0.90

0.90~1.20

0.90~1.20

Ni

≤0.25


Mechnical Property(GB/T 3077-1999):

Sample Size (mm)

25

Heat treatment(℃)

Quenching (oil cooling)

850

Tempering (water, oil cooling)

520

Physical property

Tensile Strength. MPa

≥980

Yield point. MPa

≥785

elongation after fracture. %

≥9

reduction of area. %

≥45

impact absorbing energy. J

≥47

The hardness of delivery. HBS

Annealing or high tempering

≤207

 

Sometimes engineers often confused with 40Cr and 42CrMo. Their chemical composition and physical properties are different. 42CrMo is also an alloy structural steel with 0.38-0.45% carbon, 0.9-1.2% chromium, 0.15-0.25% molybdenum,with a tensile strength 1100 MPa and yield point 950 MPa, mostly used for parts with higher load and reliability.


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