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SF-568 Class 8.8.3 E

America ASME SF-568Class8.8.3E 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 E 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 E

Element Min Max Similar
Si 0.1300 0.3700 -
S - 0.0450 -
P - 0.0450 -
Ni 0.2700 0.6300 -
Mn 0.5600 1.0400 -
Cu 0.2700 0.6300 -
Cr 0.5500 0.9500 -
C 0.1800 0.2700 -

Mechanical Properties of steel grade SF-568 Class 8.8.3 E

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)
734 (≥) 952 (≥) 22 42 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 214

Physical Properties of steel grade SF-568 Class 8.8.3 E

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
11 - -     0.23 -  
438 374 - 21.3 244   -  
665 - 13 12.2   223 242

Heat Treatment of steel grade SF-568 Class 8.8.3 E

Heat treated : 1476°C - 1447°C

Technological Curves of steel grade SF-568 Class 8.8.3 E

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

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