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France AFNOR NF 4.8 紧固件机械性能 - 第1部分:螺栓,螺钉和螺柱 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 4.8 / 4.8
Category Grade Standard Region/Area Standard Content
Metals 4.8 NF EN 20898-1 France 紧固件机械性能 - 第1部分:螺栓,螺钉和螺柱

Chemical composition(mass fraction)(wt.%) of the 4.8

Element Min Max Similar

Mechanical Properties of steel grade 4.8

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)
353 (≥) 968 (≥) 42 13 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 314

Physical Properties of steel grade 4.8

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
22 - -     0.32 -  
524 879 - 44.3 243   -  
571 - 41 42.2   123 433

Heat Treatment of steel grade 4.8

Heat treated : 1998°C - 1782°C

Technological Curves of steel grade 4.8

Cross Reference Table (Equivalent Grade) of 4.8

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