This page provides Z12CKNDWNb21-20-20 datasheet, Z12CKNDWNb21-20-20 mechanical properties, chemical element Z12CKNDWNb21-20-20, technical specifications of Z12CKNDWNb21-20-20 steel material properties. Z12CKNDWNb21-20-20 performance specifications.

AFNOR Z12CKNDWNb21-20-20 AFNOR Z12CKNDWNb21-20-20 Datasheet
Category Type Steel Grade Standard Country Application
Steel GradesBoiler & Pressure Vessel Plate Z12CKNDWNb21-20-20 AFNOR France The vent valve steel
A35-586 316F20
A35-586 316F21
A35-586 316F22
A35-586 321F20
A35-586 347F20
Datasheet for:Steel Grades:Boiler & Pressure Vessel Plate:Z12CKNDWNb21-20-20

Chemical composition(mass fraction)(wt.%) of the Z12CKNDWNb21-20-20

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Mo(%) W(%) N(%) Co(%) Nb(%)
0.08-0.16 Max 1.00 1.00-2.00 Max 0.040 Max 0.030 20.0-22.5 19.0-21.0 2.50-3.50 2.00-3.00 0.10-0.20 18.5-21.0 0.75-1.25

Mechanical properties / Mechanische Eigenschaften / Caracteristiques mecaniques of grade Z12CKNDWNb21-20-20

Rp0.2 (MPa)
Rm (MPa)
KV/Ku (J)
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
774 (≥) 556 (≥) 12 42 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 334
Modulus of elasticity
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
Specific thermal capacity
Specific electrical resistivity
(Ω mm²/m)
Poisson’s coefficient, ν
13 - -     0.22 -  
977 381 - 14.3 414   -  
716 - 14 24.2   323 144
Heat treated : 1458°C - 1871°C
Directory is being updated.
The material does not have direct Metallography properties.
Directory is being updated.
The material does not have direct Metallography properties.
Directory is being updated.
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
Z12CKNDWNb21-20-20 AFNOR France
The vent valve steel
Z12CKNDWNb21-20-20 AFNOR France
Steel Exhaust Valves
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