Seamless steel pipes for transmission of fluids
Standards:
GB/T8163 —— China national standards
Uses:
For the seamless steel pipes for transmission of fluids
Steel pipes No. of main production:
10、20、Q345 ect.
Dimensional tolerance:
|
Pipe types
|
Outer-caliber（D）
|
Thickness（S）
|
|
|
Pipe outer-caliber(mm)
|
Allowable warp(mm)
|
Pipe thickness(mm)
|
Allowable warp(mm)
|
|
Hot-rolled pipes
|
＞219
|
±1.0％
|
＞20
|
±10％
|
Mechanical Properties:
|
Standards
|
Steel pipes No.
|
Tensile strength（MPa）
|
Bend strength（MPa）
|
Elongation（％）
|
|
GB/T8163
|
10
|
335～475
|
≥205
|
≥24
|
|
20
|
410～550
|
≥245
|
≥20
|
|
Q345
|
490～665
|
≥325
|
≥21
|
Chemical composition:
|
Standards
|
Steel pipes No.
|
Chemical composition（％）
|
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
Cu
|
|
GB/T8163
|
10
|
0.07～0.14
|
0.17～0.37
|
0.35～0.65
|
≤0.035
|
≤0.035
|
≤0.15
|
≤0.25
|
≤0.25
|
|
20
|
0.17～0.24
|
0.17～0.37
|
0.35～0.65
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.25
|
≤0.25
|
|
Q345
|
0.12～0.20
|
0.20～0.55
|
1.20～1.60
|
≤0.045
|
≤0.045
|
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