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China GB 8 优质碳素结构钢 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 8 / 8
Category Grade Standard Region/Area Standard Content
Metals 8 GB/T 699 China 优质碳素结构钢

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

Element Min Max Similar
Si 0.1700 0.3700 -
S - 0.0350 -
P - 0.0350 -
Ni - 0.3000 -
Mn 0.3500 0.6500 -
Cu - 0.2500 -
Cr - 0.1000 -
C 0.0500 0.1100 -

Mechanical Properties of steel 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)
849 (≥) 373 (≥) 42 44 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 223

Physical Properties of steel 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
12 - -     0.43 -  
166 293 - 21.3 114   -  
959 - 34 31.2   424 133

Heat Treatment of steel grade 8

Heat treated : 1982°C - 1619°C

Technological Curves of steel grade 8

Cross Reference Table (Equivalent Grade) of 8

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