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France AFNOR NF 38CD4 Iron and steel. Heat treatable steels for externally threaded fasteners for structural purposes and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 38CD4 / 38 CD 4
Category Grade Standard Region/Area Standard Content
Metals 38 CD 4 NF A35-556 France Iron and steel. Heat treatable steels for externally threaded fasteners for structural purposes

Chemical composition(mass fraction)(wt.%) of the 38 CD 4

Element Min Max Similar
Si - 0.3500 -
S - 0.0300 -
P - 0.0300 -
Mo 0.1500 0.2500 -
Mn 0.6000 0.9000 -
Fe - - -
Cu - 0.3000 -
Cr 0.9000 1.2000 -
C 0.3500 0.4100 -
Al 0.0200 - -
Si 0.1000 0.4000 -
S - 0.0350 -
P - 0.0350 -
Mo 0.1500 0.2500 -
Mn 0.6000 0.9000 -
Cr 0.9000 1.2000 -
C 0.3500 0.4100 -
Si 0.1000 0.4000 -
S - 0.0350 -
P - 0.0350 -
Mo 0.1500 0.2500 -
Mn 0.6000 0.9000 -
Cr 0.9000 1.2000 -
C 0.3500 0.4100 -

Mechanical Properties of steel grade 38 CD 4

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)
998 (≥) 621 (≥) 11 14 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 141

Physical Properties of steel grade 38 CD 4

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
32 - -     0.44 -  
622 233 - 12.3 433   -  
522 - 41 34.2   122 231

Heat Treatment of steel grade 38 CD 4

Heat treated : 1872°C - 1845°C

Technological Curves of steel grade 38 CD 4

Cross Reference Table (Equivalent Grade) of 38 CD 4

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