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America SAE 4118 Chemical compositions of SAE alloy steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 4118 / 4118
Category Grade Standard Region/Area Standard Content
Metals 4118 SAE J 404 America Chemical compositions of SAE alloy steels

Chemical composition(mass fraction)(wt.%) of the 4118

Element Min Max Similar
Si 0.1500 0.3500 -
S - 0.0400 -
P - 0.0350 -
Ni - 0.2500 -
Mo 0.0800 0.1500 -
Mn 0.7000 0.9000 -
Cu - 0.3500 -
Cr 0.4000 0.6000 -
C 0.1800 0.2300 -
Si 0.1500 0.3500 -
S - 0.0400 -
P - 0.0350 -
Ni - 0.2500 -
Mo 0.0800 0.1500 -
Mn 0.7000 0.9000 -
Cu - 0.3500 -
Cr 0.4000 0.6000 -
C 0.1800 0.2300 -
Si 0.1500 0.3500 -
S - 0.0400 -
Pb 0.1500 0.3500 -
P - 0.0300 -
Ni - 0.2500 -
Mo 0.0800 0.1500 -
Mn 0.7000 0.9000 -
Cr 0.4000 0.6000 -
C 0.1800 0.2300 -

Mechanical Properties of steel grade 4118

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)
353 (≥) 731 (≥) 34 22 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 431

Physical Properties of steel grade 4118

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
14 - -     0.12 -  
846 983 - 23.3 143   -  
753 - 21 31.2   343 342

Heat Treatment of steel grade 4118

Heat treated : 1378°C - 1219°C

Technological Curves of steel grade 4118

Cross Reference Table (Equivalent Grade) of 4118

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