Seamless steel pipe for fluid transport
Pic-(Seamless steel pipe for fluid transport)
Standard of implementation： Chinese GB/T8163
Application: used in conveying water, oil, gas and other fluids
Major grade grades: Grade10, 20 (negotiated, can also supply other special grade of steel tube. Accept the special requirements of the customer orders, such as the implementation of Q/320204AAAE02-2006 standard enterprise standard mechanical piping)
Chemical composition and mechanical properties：
Dimensional tolerance:
Application: used in conveying water, oil, gas and other fluids
Major grade grades: Grade10, 20 (negotiated, can also supply other special grade of steel tube. Accept the special requirements of the customer orders, such as the implementation of Q/320204AAAE02-2006 standard enterprise standard mechanical piping)
Chemical composition and mechanical properties：
| Standard | Steel grade | Chemical constituents (%) | ||||||
| C | Mn | Si | Cr | Ni | Cu | P.S | ||
| GB/T8163 | 10 | 0.07～0.13 | 0.35～0.65 | 0.17～0.37 | ≤ 0.15 | ≤ 0.30 | ≤ 0.25 | ≤ 0.030 |
| 20 | 0.17～0.23 | 0.35～0.65 | 0.17～0.37 | ≤ 0.25 | ≤ 0.25 | ≤ 0.25 | ≤ 0.030 | |
| Q345 | 0.12～0.20 | 1.20～1.60 | 0.20～0.55 | ≤ 0.030 | ||||
| Mechanical properties | Tensile strength (MPa) | Yield strength (MPa) | Elongation(%) | |||||
| 10 | 335～475 | ≥ 205 | ≥ 24 | |||||
| 20 | 410～550 | ≥ 245 | ≥ 20 | |||||
| Q345 | 490～665 | ≥ 325 | ≥ 21 | |||||
Dimensional tolerance:
| Type of steel tube | Steel tube size mm |
Deviation | ||
| Ordinary grade | Senior | |||
| Hot rolling (extrusion, expansion) tube | Outside diameterD | All | +1%（Minimum+0.50） | - |
| Wall thicknessS | All | +15%（Minimum+0.45） -12.5%（Minimum-0.40） |
- | |
| Cold drawing (rolling) tube | Outside diameterD | 6~10 | +0.20 | +0.15 |
| >10~30 | +0.40 | +0.20 | ||
| >30~50 | +0.45 | +0.30 | ||
| >50 | +1% | +0.8% | ||
| Wall thicknessS | ≤1 | +0.15 | +0.12 | |
| >1~3 | +15% -10% |
+12.5% -10% |
||
| >3 | +12.5% -10% |
+10% | ||
| Note: the outer diameter is not less than 351mm of the thermal expansion tube, the wall thickness allows the deviation of +18% | ||||
