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SA-540 Grade B24 Class 2

America ASME SA-540GradeB24Class2 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 B24 Class 2 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 B24 Class 2

Element Min Max Similar
Si 0.1500 0.3500 -
S - 0.0250 -
P - 0.0250 -
Ni 1.6500 2.0000 -
Mo 0.3000 0.4000 -
Mn 0.7000 0.9000 -
Cr 0.7000 0.9500 -
C 0.3700 0.4400 -

Mechanical Properties of steel grade SA-540 Grade B24 Class 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)
618 (≥) 158 (≥) 32 44 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 124

Physical Properties of steel grade SA-540 Grade B24 Class 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
31 - -     0.11 -  
527 875 - 44.3 441   -  
239 - 24 32.2   122 343

Heat Treatment of steel grade SA-540 Grade B24 Class 2

Heat treated : 1484°C - 1985°C

Technological Curves of steel grade SA-540 Grade B24 Class 2

Cross Reference Table (Equivalent Grade) of SA-540 Grade B24 Class 2

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