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Description

4140 Carbon Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Carbon Steel: 4140
Category Type Steel Grade Standard Country Application
Steel GradesCarbon Steel 4140
B42
70Mn4
B43
43CrMo4
1030
1040
1050
1541
1552
4130

Chemical composition(mass fraction)(wt.%) of the 4140

 

C
Si
Mn
P
S
Cr Ni
0.38-0.43   0.15-0.35 0.75-1.0  0.025  0.015   0.8-1.1  
Mo Al Cu Nb Ti V Ce
 0.15-0.25  0.05 0.3     +    
N O2 Pb B Other    
  0.002           
             

Mechanical Properties of steel grade 4140

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV/Ku (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
871 (≥) 646 (≥) 32 34 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 333

Physical Properties of steel grade 4140

Temperature
(°C)
Modulus of elasticity
(GPa)
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)
Specific thermal capacity
(J/kg·°C)
Specific electrical resistivity
(Ω mm²/m)
Density
(kg/dm³)
Poisson’s coefficient, ν
23 - -     0.43 -  
526 213 - 32.3 323   -  
461 - 11 43.2   314 231

Heat Treatment of steel grade 4140

Heat treated : 1512°C - 1973°C

Technological Curves of steel grade 4140

Cross Reference Table (Equivalent Grade) of 4140

Grade Standard Country Application
SAE NV7(4140) SAE USA precipitation hardening
UNS H41400 UNS USA precipitation hardening
ICI 4140 AISI USA
414140 The Czech republic Structural steel
14140 The Czech republic Structural steel
4140 Australia Structural steel
4140H Australia Structural steel
4140 Australia Structural steel
4140 USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
4140 USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures

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