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China GB Q420qD 桥梁用结构钢 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: Q420qD / Q420q D
Category Grade Standard Region/Area Standard Content
Metals Q420q D GB/T 714 China 桥梁用结构钢

Chemical composition(mass fraction)(wt.%) of the Q420q D

Element Min Max Similar
Pcm - 0.2200 -
H - 0.0002 -
B - 0.0005 -
S - 0.0150 -
P - 0.0250 -
Nb+V+Ti - 0.2200 -
N - 0.0080 -
Mo - 0.2000 -
Cu - 0.3000 -
Ni - 0.3000 -
Cr - 0.5000 -
Al 0.0100 0.0450 -
Ti 0.0060 0.0300 -
V 0.0100 0.0800 -
Nb 0.0100 0.0900 -
Mn 1.0000 1.7000 -
Si - 0.5500 -
C - 0.1100 -
Al 0.0150 - -
P - 0.0250 -
S - 0.0250 -
Mn 1.3000 1.7000 -
Si - 0.6000 -
C - 0.1700 -

Mechanical Properties of steel grade Q420q D

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)
359 (≥) 644 (≥) 12 22 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 334

Physical Properties of steel grade Q420q D

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
44 - -     0.33 -  
472 572 - 44.3 221   -  
851 - 23 44.2   324 222

Heat Treatment of steel grade Q420q D

Heat treated : 1493°C - 1348°C

Technological Curves of steel grade Q420q D

Cross Reference Table (Equivalent Grade) of Q420q D

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