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France AFNOR NF FMR70 Iron and steel. Wire rods made of unalloyed steel for the manufacture of high resisting cold-formed spring wires. Types and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: FMR70 / FMR 70
Category Grade Standard Region/Area Standard Content
Metals FMR 70 NF A35-057 France Iron and steel. Wire rods made of unalloyed steel for the manufacture of high resisting cold-formed spring wires. Types

Chemical composition(mass fraction)(wt.%) of the FMR 70

Element Min Max Similar

Mechanical Properties of steel grade FMR 70

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)
791 (≥) 488 (≥) 44 24 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 221

Physical Properties of steel grade FMR 70

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
33 - -     0.33 -  
364 599 - 23.3 414   -  
866 - 44 34.2   312 123

Heat Treatment of steel grade FMR 70

Heat treated : 1879°C - 1538°C

Technological Curves of steel grade FMR 70

Cross Reference Table (Equivalent Grade) of FMR 70

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