GB/T8163 Q345 seamless steel pipe GB/T8163 Q345 seamless pipe Q345 is a steel grade of GB/T8163 standard, GB/T81630 Q345 seamless pipes for conveying water, oil, gas and other fluids. Standard: GB/T8163Seamless steel pipe for conveying flui
GB/T8163 Q345 seamless steel pipe
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Steel pipe type |
Outer diameter(OD) |
Wall thickness(WT) |
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Cold drawn tube |
Outer diameter (mm) |
Tolerance |
Wall thickness (mm) |
Tolerance |
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＞30～50 |
±0.3 |
≤30 |
±10％ |
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|
＞50～219 |
±0.8％ |
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Hot rolled tube |
＞219 |
±1.0％ |
＞20 |
±10％ |
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Standard |
Grade |
chemical composition % |
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C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
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GB/T8163 |
Q345 |
0.12～0.20 |
0.20～0.55 |
1.20～1.60 |
≤0.045 |
≤0.045 |
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/ |
/ |
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Standard |
Grade |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation(%) |
|
GB/T8163 |
Q345 |
490～665 |
≥325 |
≥21 |
Weight calculation formula: [(outer diameter - wall thickness) * wall thickness] * 0.02466
Steel pipe production process: hot rolling, hot expansion, cold drawing
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