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China GB U74 铁路用热轧钢轨 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: U74 / U74
Category Grade Standard Region/Area Standard Content
Metals U74 GB 2585 China 铁路用热轧钢轨

Chemical composition(mass fraction)(wt.%) of the U74

Element Min Max Similar

Mechanical Properties of steel grade U74

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)
465 (≥) 161 (≥) 22 22 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 134

Physical Properties of steel grade U74

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
13 - -     0.23 -  
198 347 - 21.3 143   -  
647 - 31 12.2   323 111

Heat Treatment of steel grade U74

Heat treated : 1681°C - 1271°C

Technological Curves of steel grade U74

Cross Reference Table (Equivalent Grade) of U74

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