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SA-540 Grade B21 Class 5

America ASME SA-540GradeB21Class5 特殊用途合金钢螺栓连接材料 and Mechanical Properties, Chemical Element, Cross Reference.

Category Grade Standard Region/Area Standard Content
Metals SA-540 Grade B21 Class 5 ASME SA-540/SA-540M America 特殊用途合金钢螺栓连接材料

Chemical composition(mass fraction)(wt.%) of the SA-540 Grade B21 Class 5

Element Min Max Similar

Mechanical Properties of steel grade SA-540 Grade B21 Class 5

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)
129 (≥) 546 (≥) 42 41 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 333

Physical Properties of steel grade SA-540 Grade B21 Class 5

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 - -     0.12 -  
912 239 - 44.3 211   -  
422 - 44 11.2   143 443

Heat Treatment of steel grade SA-540 Grade B21 Class 5

Heat treated : 1488°C - 1181°C

Technological Curves of steel grade SA-540 Grade B21 Class 5

Cross Reference Table (Equivalent Grade) of SA-540 Grade B21 Class 5

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