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31 CrNiMo 8

Germany DIN 31CrNiMo8 Alloyed NiCrMo steel and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 31CrNiMo8 / 31 CrNiMo 8
Category Grade Standard Region/Area Standard Content
Metals 31 CrNiMo 8 -- Germany Alloyed NiCrMo steel

Chemical composition(mass fraction)(wt.%) of the 31 CrNiMo 8

Element Min Max Similar
Si 0.1500 0.3500 -
S - 0.0350 -
P - 0.0350 -
Ni 1.8000 2.1000 -
Mo 0.2500 0.3500 -
Mn 0.3000 0.6000 -
Cr 1.8000 2.1000 -
C 0.2600 0.3400 -

Mechanical Properties of steel grade 31 CrNiMo 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)
535 (≥) 299 (≥) 34 31 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 144

Physical Properties of steel grade 31 CrNiMo 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
21 - -     0.32 -  
787 532 - 42.3 134   -  
946 - 33 24.2   342 341

Heat Treatment of steel grade 31 CrNiMo 8

Heat treated : 1744°C - 1561°C

Technological Curves of steel grade 31 CrNiMo 8

Cross Reference Table (Equivalent Grade) of 31 CrNiMo 8

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