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Description

China Q255 A Engineering and welding and Q255 A Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: Q255 A
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel Q255 A China Engineering and welding
Q195
Q215
Q215 B
Q235
Q235 B
Q235 C
Q235 D
STHA 20
STHA 22
STHA 23

Chemical composition(mass fraction)(wt.%) of the Q255 A

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Cu(%)
0.18~0.28 ≤0.30 0.40~0.70 0.045 0.050 ≤0.30 ≤0.30 ≤0.30

Mechanical Properties of steel grade Q255 A

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)
293 (≥) 964 (≥) 42 23 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 424

Physical Properties of steel grade Q255 A

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
22 - -     0.12 -  
621 551 - 14.3 131   -  
869 - 43 14.2   232 143

Heat Treatment of steel grade Q255 A

Heat treated : 1932°C - 1872°C

Technological Curves of steel grade Q255 A

Cross Reference Table (Equivalent Grade) of Q255 A

Grade Standard Country Application
Q255 A China Engineering and welding
Q255 B China Engineering and welding
Q255 GBT China China structural steel and alloy steel
Q255 GBT China China structural steel and alloy steel
Q195 GBT China Engineering and welding
Q215 China Engineering and welding
Q215 B China Engineering and welding
Q235 China Engineering and welding
Q235 B China Engineering and welding
Q235 C China Engineering and welding
Q235 D China Engineering and welding
Q275 China Engineering and welding
Q235q C China Bridge structure with steel
Q235q D China Bridge structure with steel
Q345q E China Bridge structure with steel
Q345q C China Bridge structure with steel
ASTM 1030 ASTM USA General use carbon steel bar
UNS G10300 UNS USA General use carbon steel bar

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