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France AFNOR NF 45C4 Iron and steel. Special structural steels suitable for the manufacture of suspension components and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 45C4 / 45 C 4
Category Grade Standard Region/Area Standard Content
Metals 45 C 4 NF A35-571 France Iron and steel. Special structural steels suitable for the manufacture of suspension components

Chemical composition(mass fraction)(wt.%) of the 45 C 4

Element Min Max Similar
Si 0.1000 0.4000 -
S - 0.0250 -
P - 0.0350 -
Mn 0.6000 0.9000 -
Cr 0.9000 1.2000 -
C 0.4100 0.4800 -

Mechanical Properties of steel grade 45 C 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)
375 (≥) 964 (≥) 32 12 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 242

Physical Properties of steel grade 45 C 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
31 - -     0.23 -  
367 128 - 24.3 242   -  
596 - 14 44.2   134 243

Heat Treatment of steel grade 45 C 4

Heat treated : 1497°C - 1613°C

Technological Curves of steel grade 45 C 4

Cross Reference Table (Equivalent Grade) of 45 C 4

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