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France AFNOR NF FMR68 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: FMR68 / FMR 68
Category Grade Standard Region/Area Standard Content
Metals FMR 68 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 68

Element Min Max Similar

Mechanical Properties of steel grade FMR 68

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)
133 (≥) 672 (≥) 12 33 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 423

Physical Properties of steel grade FMR 68

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
44 - -     0.43 -  
338 136 - 42.3 423   -  
913 - 44 22.2   333 311

Heat Treatment of steel grade FMR 68

Heat treated : 1344°C - 1152°C

Technological Curves of steel grade FMR 68

Cross Reference Table (Equivalent Grade) of FMR 68

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