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England B.S. 625-640 Specification for steels for fired and unfired pressure vessels: sections and bars and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 625-640 / 625-640
Category Grade Standard Region/Area Standard Content
Metals 625-640 BS 1502 England Specification for steels for fired and unfired pressure vessels: sections and bars

Chemical composition(mass fraction)(wt.%) of the 625-640

Element Min Max Similar

Mechanical Properties of steel grade 625-640

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)
173 (≥) 448 (≥) 33 41 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 143

Physical Properties of steel grade 625-640

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
23 - -     0.23 -  
433 918 - 41.3 322   -  
757 - 34 11.2   243 123

Heat Treatment of steel grade 625-640

Heat treated : 1118°C - 1393°C

Technological Curves of steel grade 625-640

Cross Reference Table (Equivalent Grade) of 625-640

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