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France AFNOR NF X55H2 Rolling stock. Recommended steels for stock construction. VII: unalloyed and alloy heat treated steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: X55H2 / X 55 H 2
Category Grade Standard Region/Area Standard Content
Metals X 55 H 2 NF F 80-107 France Rolling stock. Recommended steels for stock construction. VII: unalloyed and alloy heat treated steels

Chemical composition(mass fraction)(wt.%) of the X 55 H 2

Element Min Max Similar

Mechanical Properties of steel grade X 55 H 2

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)
174 (≥) 253 (≥) 32 11 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 313

Physical Properties of steel grade X 55 H 2

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
12 - -     0.12 -  
497 126 - 33.3 432   -  
827 - 34 13.2   411 223

Heat Treatment of steel grade X 55 H 2

Heat treated : 1568°C - 1775°C

Technological Curves of steel grade X 55 H 2

Cross Reference Table (Equivalent Grade) of X 55 H 2

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