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France AFNOR NF 20M5 Iron and steel products. Chain steels. Grades and types and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 20M5 / 20 M 5
Category Grade Standard Region/Area Standard Content
Metals 20 M 5 NF A35-566 France Iron and steel products. Chain steels. Grades and types

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

Element Min Max Similar
Si 0.1000 0.3500 -
S - 0.0350 -
P - 0.0350 -
Mn 1.1000 1.4000 -
C 0.1600 0.2200 -
B 0.0008 - -
Al 0.0200 - -

Mechanical Properties of steel grade 20 M 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)
139 (≥) 837 (≥) 34 32 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 111

Physical Properties of steel grade 20 M 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
21 - -     0.22 -  
528 779 - 41.3 241   -  
844 - 24 14.2   332 324

Heat Treatment of steel grade 20 M 5

Heat treated : 1819°C - 1778°C

Technological Curves of steel grade 20 M 5

Cross Reference Table (Equivalent Grade) of 20 M 5

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