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China GJB D55 炮弹用碳素钢棒规范 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: D55 / D55
Category Grade Standard Region/Area Standard Content
Metals D55 GJB 398A China 炮弹用碳素钢棒规范

Chemical composition(mass fraction)(wt.%) of the D55

Element Min Max Similar
C 0.5200 0.6000 -
Mn 0.5000 0.8000 -
Si 0.1700 0.4000 -
P - 0.0400 -
S - 0.0400 -
Cr - 0.3000 -
Ni - 0.3000 -
Cu - 0.2000 -

Mechanical Properties of steel grade D55

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)
951 (≥) 191 (≥) 31 13 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 324

Physical Properties of steel grade D55

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
24 - -     0.42 -  
652 254 - 44.3 224   -  
624 - 33 22.2   332 344

Heat Treatment of steel grade D55

Heat treated : 1792°C - 1225°C

Technological Curves of steel grade D55

Cross Reference Table (Equivalent Grade) of D55

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