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France AFNOR NF 20MC5 Case hardening steels - Technical delivery conditions and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 20MC5 / 20 MC 5
Category Grade Standard Region/Area Standard Content
Metals 20 MC 5 NF A35-551 France Case hardening steels - Technical delivery conditions

Chemical composition(mass fraction)(wt.%) of the 20 MC 5

Element Min Max Similar
Si - 0.3500 -
S - 0.0300 -
P - 0.0300 -
Mn 1.1000 1.4000 -
Cu - 0.3000 -
Cr 1.0000 1.3000 -
C 0.1700 0.2200 -
Al 0.0200 - -

Mechanical Properties of steel grade 20 MC 5

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)
352 (≥) 293 (≥) 21 32 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 422

Physical Properties of steel grade 20 MC 5

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 - -     0.41 -  
797 762 - 24.3 124   -  
147 - 34 12.2   211 231

Heat Treatment of steel grade 20 MC 5

Heat treated : 1955°C - 1461°C

Technological Curves of steel grade 20 MC 5

Cross Reference Table (Equivalent Grade) of 20 MC 5

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