SAE 4140 SAE 4140 Datasheet
Category Type Steel Grade Standard Country Application
Steel GradesCarbon Steel SAE 4140
SAE 4125
AISI 4130
SAE 4130
UNS G41300
AISI 4137
SAE 4137
UNS G41370
AISI TS4137
AISI E4137
AISI 4140
Datasheet for:Steel Grades:Carbon Steel:SAE 4140

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

C
Si
Mn
P
S
Cr Ni
0.38-0.43  0.15-0.35  0.75-1 0.035 0.04  0.8-1.1  
Mo Al Cu Nb Ti V Ce
0.15-0.25            
N Co Pb B Other    
             
             

Mechanical properties / Mechanische Eigenschaften / Caracteristiques mecaniques of grade SAE 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)
745 (≥) 992 (≥) 33 21 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 232
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
33 - -     0.13 -  
219 777 - 13.3 131   -  
849 - 11 22.2   144 122
Heat treated : 1973°C - 1477°C
Directory is being updated.
The material does not have direct Metallography properties.
Directory is being updated.
The material does not have direct Metallography properties.
Directory is being updated.
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
A 276 S41400
Stainless Steel Bars and Shapes
A 314 S41400
Stainless Steel Billets and Bars for Forging
A 473 S41400
Stainless Steel Forgings
A 580 S41400
Stainless Steel Wire
S41400
Martensitic Chromium Stainless Steel
NV7(4140)
Steel for intake valves
H41400
Steel for intake valves
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