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France AFNOR NF 4 紧固件机械性能 - 第2部分:规定保证载荷值的螺母 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 4 / 4
Category Grade Standard Region/Area Standard Content
Metals 4 NF EN 20898-2 France 紧固件机械性能 - 第2部分:规定保证载荷值的螺母

Chemical composition(mass fraction)(wt.%) of the 4

Element Min Max Similar

Mechanical Properties of steel grade 4

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)
344 (≥) 527 (≥) 12 24 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 141

Physical Properties of steel grade 4

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
12 - -     0.42 -  
146 826 - 24.3 413   -  
439 - 33 31.2   442 121

Heat Treatment of steel grade 4

Heat treated : 1373°C - 1473°C

Technological Curves of steel grade 4

Cross Reference Table (Equivalent Grade) of 4

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