Seamless steel tubes for liquid service
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Standard: GB/T8163- Chinese Standard
Purpose: General seamless steel pipe for conveying fluids
Main steel pipe grades: 10, 20, Q345, etc
Dimensional tolerance: |
| Steel pipe type | Outside diameter（D） | Steel pipe wall thickness（S） | | Cold-drawn pipe | Outer diameter of steel pipe(mm) | Allowable deviation(mm) | Steel pipe wall thickness(mm) | Allowable deviation(mm) | | ＞30～50 | ±0.3 | ≤30 | ±10％ | | ＞50～219 | ±0.8％ | |
| Mechanical： |
| Standard | Name of shop | Tensile 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 | Name of shop |
Chemical composition（％） | | 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 | / | / | / | |
