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20 NiCrMo 7

France AFNOR NF 20NiCrMo7 Iron and steel. Steels for bearings. Types and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 20NiCrMo7 / 20 NiCrMo 7
Category Grade Standard Region/Area Standard Content
Metals 20 NiCrMo 7 NF A35-565 France Iron and steel. Steels for bearings. Types

Chemical composition(mass fraction)(wt.%) of the 20 NiCrMo 7

Element Min Max Similar

Mechanical Properties of steel grade 20 NiCrMo 7

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)
479 (≥) 131 (≥) 21 43 22 Solution and Aging, Annealing, Ausaging, Q+T,etc 423

Physical Properties of steel grade 20 NiCrMo 7

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 -  
167 541 - 41.3 441   -  
421 - 24 42.2   233 213

Heat Treatment of steel grade 20 NiCrMo 7

Heat treated : 1662°C - 1764°C

Technological Curves of steel grade 20 NiCrMo 7

Cross Reference Table (Equivalent Grade) of 20 NiCrMo 7

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