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Z 12 CKNDWNb 21-20-20

France AFNOR NF Z12CKNDWNb21-20-20 Valve steels and alloys for internal combustion engines and Mechanical Properties, Chemical Element, Cross Reference.

Category Grade Standard Region/Area Standard Content
Metals Z 12 CKNDWNb 21-20-20 NF A35-579 France Valve steels and alloys for internal combustion engines

Chemical composition(mass fraction)(wt.%) of the Z 12 CKNDWNb 21-20-20

Element Min Max Similar
W 2.0000 3.0000 -
Si - 1.0000 -
S - 0.0300 -
P - 0.0400 -
Ni 19.0000 21.0000 -
Nb 0.7500 1.2500 -
N 0.1000 0.2000 -
Mo 2.5000 3.5000 -
Mn 1.0000 2.0000 -
Cr 20.0000 22.5000 -
Co 18.5000 21.0000 -
C 0.0800 0.1600 -

Mechanical Properties of steel grade Z 12 CKNDWNb 21-20-20

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)
191 (≥) 237 (≥) 34 21 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 334

Physical Properties of steel grade Z 12 CKNDWNb 21-20-20

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
32 - -     0.43 -  
429 584 - 23.3 423   -  
795 - 33 21.2   311 211

Heat Treatment of steel grade Z 12 CKNDWNb 21-20-20

Heat treated : 1497°C - 1254°C

Technological Curves of steel grade Z 12 CKNDWNb 21-20-20

Cross Reference Table (Equivalent Grade) of Z 12 CKNDWNb 21-20-20

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