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Standard
GB/T8163 Chinese national standard
Diamensional tolerances:
Types of steel tubes | Outer diameter | Wall thickness | ||
Cold-rolled tubes | Tube sizes(mm) | Tolerances(mm) | Tube sizes (mm) | Tolerances(mm) |
3050 | ±0.3 | ≤30 | ±10 | |
50219 | ±0.8 | |||
Mechanical properties:
Standard codes | Models of steel tubes | Tensite strengthMPa | Yield strengthMPa | Elongation |
GB/T8163 | 10 | 335475 | ≥205 | ≥24 |
20 | 410550 | ≥245 | ≥20 | |
Q345 | 490665 | ≥325 | ≥21 |
Chemical composition:
Standard codes | Models of steel tubes | Chemical compositions | ||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | |||
GB/T8163 | 10 | 0.070.14 | 0.170.37 | 0.350.65 | ≤0.035 | ≤0.035 | ≤0.15 | ≤0.25 | ≤0.25 | |
20 | 0.170.24 | 0.170.37 | 0.350.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.25 | ≤0.25 | ||
Q345 | 0.120.20 | 0.200.55 | 1.201.60 | ≤0.045 | ≤0.045 | / | / | / | ||
GB/T8163 Seamless steel tube