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England B.S. 221-550 Specification for steel forgings for pressure purposes and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 221-550 / 221-550
Category Grade Standard Region/Area Standard Content
Metals 221-550 BS 1503 England Specification for steel forgings for pressure purposes

Chemical composition(mass fraction)(wt.%) of the 221-550

Element Min Max Similar

Mechanical Properties of steel grade 221-550

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)
181 (≥) 685 (≥) 22 31 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 422

Physical Properties of steel grade 221-550

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 - -     0.23 -  
444 453 - 12.3 433   -  
772 - 33 11.2   313 311

Heat Treatment of steel grade 221-550

Heat treated : 1563°C - 1945°C

Technological Curves of steel grade 221-550

Cross Reference Table (Equivalent Grade) of 221-550

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