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40 NCD 18

France AFNOR NF 40NCD18 Non standardized steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 40NCD18 / 40 NCD 18
Category Grade Standard Region/Area Standard Content
Metals 40 NCD 18 -- France Non standardized steels

Chemical composition(mass fraction)(wt.%) of the 40 NCD 18

Element Min Max Similar
Si 0.1000 0.4000 -
S - 0.0250 -
P - 0.0300 -
Ni 4.3000 4.9000 -
Mo 0.3500 0.6000 -
Mn 0.2000 0.5500 -
Cr 1.4000 1.7000 -
C 0.3500 0.4500 -

Mechanical Properties of steel grade 40 NCD 18

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)
442 (≥) 348 (≥) 23 44 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 443

Physical Properties of steel grade 40 NCD 18

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
24 - -     0.11 -  
821 315 - 22.3 332   -  
426 - 14 44.2   411 121

Heat Treatment of steel grade 40 NCD 18

Heat treated : 1149°C - 1496°C

Technological Curves of steel grade 40 NCD 18

Cross Reference Table (Equivalent Grade) of 40 NCD 18

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