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France AFNOR NF 20NCD7 Iron and steel. Steels for bearings. Types and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 20NCD7 / 20 NCD 7
Category Grade Standard Region/Area Standard Content
Metals 20 NCD 7 NF A35-565 France Iron and steel. Steels for bearings. Types

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

Element Min Max Similar

Mechanical Properties of steel grade 20 NCD 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)
548 (≥) 639 (≥) 44 41 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 213

Physical Properties of steel grade 20 NCD 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
11 - -     0.31 -  
659 371 - 43.3 112   -  
899 - 31 32.2   323 333

Heat Treatment of steel grade 20 NCD 7

Heat treated : 1892°C - 1535°C

Technological Curves of steel grade 20 NCD 7

Cross Reference Table (Equivalent Grade) of 20 NCD 7

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