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SF-568 Class 8.8.3 D

America ASME SF-568Class8.8.3D 碳及合金钢米制外螺纹紧固件的技术规范 and Mechanical Properties, Chemical Element, Cross Reference.

Category Grade Standard Region/Area Standard Content
Metals SF-568 Class 8.8.3 D ASME SF-568M America 碳及合金钢米制外螺纹紧固件的技术规范

Chemical composition(mass fraction)(wt.%) of the SF-568 Class 8.8.3 D

Element Min Max Similar
Ti - 0.0500 -
Si 0.2000 0.5500 -
S - 0.0550 -
P - 0.0450 -
Ni 0.4700 0.8300 -
Mo - 0.1100 -
Mn 0.3600 1.2400 -
Cu 0.2700 0.5300 -
Cr 0.4500 1.0500 -
C 0.1400 0.2600 -

Mechanical Properties of steel grade SF-568 Class 8.8.3 D

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)
211 (≥) 746 (≥) 11 24 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 432

Physical Properties of steel grade SF-568 Class 8.8.3 D

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
14 - -     0.14 -  
277 156 - 22.3 243   -  
789 - 33 22.2   423 124

Heat Treatment of steel grade SF-568 Class 8.8.3 D

Heat treated : 1767°C - 1886°C

Technological Curves of steel grade SF-568 Class 8.8.3 D

Cross Reference Table (Equivalent Grade) of SF-568 Class 8.8.3 D

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