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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)
988 (≥) 545 (≥) 11 21 22 Solution and Aging, Annealing, Ausaging, Q+T,etc 444

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
41 - -     0.34 -  
772 819 - 34.3 222   -  
494 - 23 21.2   311 233

Heat Treatment of steel grade 4

Heat treated : 1695°C - 1592°C

Technological Curves of steel grade 4

Cross Reference Table (Equivalent Grade) of 4

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