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France AFNOR NF 18NCD4 Iron and steel. Steels for bearings. Types and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 18NCD4 / 18 NCD 4
Category Grade Standard Region/Area Standard Content
Metals 18 NCD 4 NF A35-565 France Iron and steel. Steels for bearings. Types

Chemical composition(mass fraction)(wt.%) of the 18 NCD 4

Element Min Max Similar

Mechanical Properties of steel grade 18 NCD 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)
431 (≥) 645 (≥) 31 41 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 233

Physical Properties of steel grade 18 NCD 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 - -     0.42 -  
923 658 - 21.3 231   -  
333 - 13 21.2   234 333

Heat Treatment of steel grade 18 NCD 4

Heat treated : 1352°C - 1774°C

Technological Curves of steel grade 18 NCD 4

Cross Reference Table (Equivalent Grade) of 18 NCD 4

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