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Japan JIS SKD8 合金工具钢 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: SKD8 / SKD 8
Category Grade Standard Region/Area Standard Content
Metals SKD 8 JIS G4404 Japan 合金工具钢

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

Element Min Max Similar
W 3.8000 4.5000 -
V 1.7000 2.1000 -
Si 0.1500 0.5000 -
S - 0.0200 -
P - 0.0300 -
Mo 0.3000 0.5000 -
Mn 0.2000 0.5000 -
Cr 4.0000 4.7000 -
Co 4.0000 4.5000 -
C 0.3500 0.4500 -

Mechanical Properties of steel grade SKD 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)
195 (≥) 266 (≥) 31 33 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 121

Physical Properties of steel grade SKD 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
14 - -     0.41 -  
263 551 - 13.3 242   -  
323 - 33 32.2   222 133

Heat Treatment of steel grade SKD 8

Heat treated : 1851°C - 1898°C

Technological Curves of steel grade SKD 8

Cross Reference Table (Equivalent Grade) of SKD 8

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