Loading Port:China Main Port
Payment Terms:TT OR LC
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Standard：
GB／T8163 Chinese national standard
Application：
General seamless steel tubes for conveying fluids
Models of major steel tubes：
10．20，Q345，etc．
Diamensional tolerances:
Types of steel tubes | Outer diameter | Wall thickness | ||
Cold-rolled tubes | Tube sizes(mm) | Tolerances(mm) | Tube sizes (mm) | Tolerances(mm) |
＞30～50 | ±0.3 | ≤30 | ±10％ | |
＞50～219 | ±0.8％ | |||
Hot-rolled tubes | ＞219 | ±1.0％ | ＞20 | ±10％ |
Mechanical properties：
Standard codes | Models of steel tubes | Tensite strength（MPa） | Yield strength（MPa） | Elongation（％） |
GB/T8163 | 10 | 335～475 | ≥205 | ≥24 |
20 | 410～550 | ≥245 | ≥20 | |
Q345 | 490～665 | ≥325 | ≥21 |
Chemical composition:
Standard codes | Models of steel tubes | Chemical compositions（％） | |||||||
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 | / | / | / | |
