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France AFNOR NF 55S7 Iron and steel. Continuously hot-rolled strip of non-alloy and alloy steels for cold re-rolling. Technical delivery conditions and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 55S7 / 55 S 7
Category Grade Standard Region/Area Standard Content
Metals 55 S 7 NF A36-102 France Iron and steel. Continuously hot-rolled strip of non-alloy and alloy steels for cold re-rolling. Technical delivery conditions

Chemical composition(mass fraction)(wt.%) of the 55 S 7

Element Min Max Similar
Si 1.6000 2.0000 -
S - 0.0200 -
P - 0.0250 -
Ni - 0.2000 -
Mo - 0.1000 -
Mn 0.6000 0.9000 -
Cr - 0.4500 -
C 0.5100 0.6000 -

Mechanical Properties of steel grade 55 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)
256 (≥) 247 (≥) 32 11 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 241

Physical Properties of steel grade 55 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 - -     0.22 -  
529 612 - 12.3 114   -  
254 - 32 13.2   222 143

Heat Treatment of steel grade 55 S 7

Heat treated : 1332°C - 1483°C

Technological Curves of steel grade 55 S 7

Cross Reference Table (Equivalent Grade) of 55 S 7

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