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France AFNOR NF 51S7 Iron and steel. Special structural steels suitable for the manufacture of suspension components and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 51S7 / 51 S 7
Category Grade Standard Region/Area Standard Content
Metals 51 S 7 NF A35-571 France Iron and steel. Special structural steels suitable for the manufacture of suspension components

Chemical composition(mass fraction)(wt.%) of the 51 S 7

Element Min Max Similar
Si 1.6000 2.0000 -
S - 0.0350 -
P - 0.0350 -
Mn 0.5000 0.8000 -
Cr - 0.3000 -
C 0.4800 0.5400 -
Si 1.6000 2.0000 -
S - 0.0350 -
P - 0.0350 -
Mn 0.5000 0.8000 -
Cr - 0.3000 -
C 0.4800 0.5400 -

Mechanical Properties of steel grade 51 S 7

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)
291 (≥) 537 (≥) 42 44 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 312

Physical Properties of steel grade 51 S 7

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 - -     0.31 -  
514 583 - 23.3 124   -  
314 - 23 32.2   231 422

Heat Treatment of steel grade 51 S 7

Heat treated : 1338°C - 1397°C

Technological Curves of steel grade 51 S 7

Cross Reference Table (Equivalent Grade) of 51 S 7

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