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20 ChN 4 FA

Bulgaria BDS 20ChN4FA Alloyed constructional steels. Designations and technical requirements and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 20ChN4FA / 20 ChN 4 FA
Category Grade Standard Region/Area Standard Content
Metals 20 ChN 4 FA BDS 6354 Bulgaria Alloyed constructional steels. Designations and technical requirements

Chemical composition(mass fraction)(wt.%) of the 20 ChN 4 FA

Element Min Max Similar
W - 0.2000 -
V 0.1000 0.1800 -
Ti - 0.0300 -
Si 0.1700 0.3700 -
S - 0.0250 -
P - 0.0250 -
Ni 3.7500 4.1500 -
Mo - 0.1500 -
Mn 0.2500 0.5000 -
Cu - 0.3000 -
Cr 0.7000 1.1000 -
C 0.1700 0.2400 -

Mechanical Properties of steel grade 20 ChN 4 FA

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)
861 (≥) 665 (≥) 21 34 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 214

Physical Properties of steel grade 20 ChN 4 FA

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
24 - -     0.14 -  
657 471 - 23.3 411   -  
537 - 41 14.2   322 224

Heat Treatment of steel grade 20 ChN 4 FA

Heat treated : 1941°C - 1176°C

Technological Curves of steel grade 20 ChN 4 FA

Cross Reference Table (Equivalent Grade) of 20 ChN 4 FA

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