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A278 Class 40

America ASTM A278Class40 适用于650F容压部件用灰铸铁件的技术规范 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: A278Class40 / A278 Class 40
Category Grade Standard Region/Area Standard Content
Metals A278 Class 40 ASTM A278/A278M America 适用于650F容压部件用灰铸铁件的技术规范

Chemical composition(mass fraction)(wt.%) of the A278 Class 40

Element Min Max Similar
S - 0.1200 -
P - 0.2500 -
CEV - 3.8000 -

Mechanical Properties of steel grade A278 Class 40

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)
412 (≥) 947 (≥) 23 23 21 Solution and Aging, Annealing, Ausaging, Q+T,etc 344

Physical Properties of steel grade A278 Class 40

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
34 - -     0.21 -  
224 684 - 32.3 442   -  
124 - 33 32.2   132 322

Heat Treatment of steel grade A278 Class 40

Heat treated : 1392°C - 1165°C

Technological Curves of steel grade A278 Class 40

Cross Reference Table (Equivalent Grade) of A278 Class 40

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