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France AFNOR NF FMR78 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: FMR78 / FMR 78
Category Grade Standard Region/Area Standard Content
Metals FMR 78 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 78

Element Min Max Similar

Mechanical Properties of steel grade FMR 78

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)
179 (≥) 815 (≥) 13 31 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 334

Physical Properties of steel grade FMR 78

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
41 - -     0.24 -  
853 648 - 12.3 333   -  
139 - 32 32.2   134 442

Heat Treatment of steel grade FMR 78

Heat treated : 1965°C - 1665°C

Technological Curves of steel grade FMR 78

Cross Reference Table (Equivalent Grade) of FMR 78

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