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America SAE Grade8 Mechanical and material requirements for externally threaded fasteners and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: Grade8 / Grade 8
Category Grade Standard Region/Area Standard Content
Metals Grade 8 SAE J 429 America Mechanical and material requirements for externally threaded fasteners

Chemical composition(mass fraction)(wt.%) of the Grade 8

Element Min Max Similar

Mechanical Properties of steel grade Grade 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)
147 (≥) 199 (≥) 42 24 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 133

Physical Properties of steel grade Grade 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
32 - -     0.32 -  
697 198 - 23.3 444   -  
838 - 42 31.2   244 432

Heat Treatment of steel grade Grade 8

Heat treated : 1371°C - 1634°C

Technological Curves of steel grade Grade 8

Cross Reference Table (Equivalent Grade) of Grade 8

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