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SA-320 Grade L7B

America ASME SA-320GradeL7B 低温用合金钢螺栓材料 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: SA-320GradeL7B / SA-320 Grade L7B
Category Grade Standard Region/Area Standard Content
Metals SA-320 Grade L7B ASME SA-320/SA-320M America 低温用合金钢螺栓材料

Chemical composition(mass fraction)(wt.%) of the SA-320 Grade L7B

Element Min Max Similar
Si 0.1500 0.3500 -
S - 0.0400 -
P - 0.0350 -
Mo 0.1500 0.2500 -
Mn 0.7000 0.9000 -
Cr 0.8000 1.1000 -
C 0.3500 0.4000 -

Mechanical Properties of steel grade SA-320 Grade L7B

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)
327 (≥) 864 (≥) 14 13 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 442

Physical Properties of steel grade SA-320 Grade L7B

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
43 - -     0.24 -  
535 893 - 32.3 233   -  
772 - 13 11.2   313 423

Heat Treatment of steel grade SA-320 Grade L7B

Heat treated : 1223°C - 1634°C

Technological Curves of steel grade SA-320 Grade L7B

Cross Reference Table (Equivalent Grade) of SA-320 Grade L7B

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