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Global 企业标准 255G and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 255G / 255G
Category Grade Standard Region/Area Standard Content
Metals 255G -- Global

Chemical composition(mass fraction)(wt.%) of the 255G

Element Min Max Similar
V - 0.1000 -
Si 0.1500 0.4000 -
S - 0.0050 -
P - 0.0250 -
Ni 3.2500 3.7500 -
Mo 0.1500 0.2500 -
Mn 0.4000 0.7000 -
Cu - 0.3000 -
Cr 1.3000 1.6000 -
C 0.1500 0.1800 -
Al 0.0300 0.0500 -

Mechanical Properties of steel grade 255G

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)
862 (≥) 223 (≥) 13 41 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 234

Physical Properties of steel grade 255G

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
13 - -     0.14 -  
476 444 - 24.3 341   -  
842 - 14 32.2   311 421

Heat Treatment of steel grade 255G

Heat treated : 1929°C - 1858°C

Technological Curves of steel grade 255G

Cross Reference Table (Equivalent Grade) of 255G

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