Seamless Pipe for Fluid Transport
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Seamless Pipe for Fluid Transport
Seamless Steel Pipe for Fluid Transportation
● National Standard: GB/T8163-2008
● Usage: used to transport fluids such as water, oil, and gas
● Main grade steel grades: 10 #, 20 #, Q345 (after consultation, other special grades of steel pipe can also be supplied. For example, Q295, Q390, Q420, Q460 quality grade is A, B, C, D)
● Chemical composition, machinery performance:
|
standard |
Steel grade | chemical composition(%) | ||||||
| C | Mn | Si | Cr | Ni | Cu | PS | ||
| GB/T8163 | 10# | 0.07 to 0.13 | 0.35 to 0.65 | 0.17 to 0.37 | ≤ 0.15 | ≤ 0.30 | ≤ 0.25 | ≤ 0.030 |
| 20# | 0.17 to 0.23 | 0.35 to 0.65 | 0.17 to 0.37 | ≤ 0.25 | ≤ 0.25 | ≤ 0.25 | ≤ 0.030 | |
| Q345 | 0.12 to 0.20 | 1.20 to 1.60 | 0.20 to 0.55 | ≤ 0.030 | ||||
| Mechanical behavior | Tensile strength (MPa) | Yield strength (MPa) | Elongation(%) | |||||
| 10 | 335-475 | ≥ 205 | ≥ 24 | |||||
| 20 | 410 to 550 | ≥ 245 | ≥ 20 | |||||
| Q345 | 490~665 | ≥ 325 | ≥ 21 | |||||
● Dimensional tolerance:
|
Steel pipe type |
Steel tube size mm |
Allowable deviation | ||
| Ordinary level | advanced | |||
| Hot-rolled (extruded, expanded) tube | Outer diameter D | All | ±1%D (minimum ±0.50) | - |
| Wall thickness S | All |
+15%S (minimum +0.45) -12.5%S (minimum -0.40) |
- | |
| Cold drawn (rolled) tube | Outer diameter D | 6~10 | ±1%D or ±0.20 | ±0.15 |
| >10~30 | ±0.30 | ±0.20 | ||
| >30~50 | ±0.45 | ±0.30 | ||
| >50 | ±1% | ±0.8% | ||
| Wall thickness S | ≤1 | ±0.15 | ±0.12 | |
| >1~3 |
+15% -10% |
+12.5% -10% |
||
| >3 |
+12.5% -10% |
±10% | ||
|
*Note: The wall thickness tolerance is + 18%S for thermal expansion tubes with an outside diameter of not less than 351mm. |
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