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25 CD 4 u

France AFNOR NF 25CD4u Quenched and tempered steels - Part 1: technical delivery conditions for specials steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 25CD4u / 25 CD 4 u
Category Grade Standard Region/Area Standard Content
Metals 25 CD 4 u NF A35-552-1 France Quenched and tempered steels - Part 1: technical delivery conditions for specials steels

Chemical composition(mass fraction)(wt.%) of the 25 CD 4 u

Element Min Max Similar

Mechanical Properties of steel grade 25 CD 4 u

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)
647 (≥) 514 (≥) 43 14 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 311

Physical Properties of steel grade 25 CD 4 u

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 - -     0.13 -  
523 368 - 42.3 122   -  
392 - 12 44.2   233 224

Heat Treatment of steel grade 25 CD 4 u

Heat treated : 1254°C - 1727°C

Technological Curves of steel grade 25 CD 4 u

Cross Reference Table (Equivalent Grade) of 25 CD 4 u

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