Outer diameter:10mm---530mm
Wall thickness:1.5mm---40mm
Standard:GB9948—88
Material:20\12CrMo\15CrMo
Application:Used in the manufacture of oil-refinery furnace tube, heat exchanger tubes and pipes
●Size deviation
Category | Size | Allowable deviation | |
Hot-rolled pipe | Outer diameter(mm) | ≤ 159 | ± 1.00% |
159 | ± 1.25% | ||
Wall thickness(mm) | ≤ 20 | ± 12.5% | |
20 | ± 10.0% | ||
cold drawn pipe | Outer diameter(mm) | ≤ 30 | ± 0.20 |
30~50 | ± 0.30 | ||
50 | ± 0.8% | ||
Wall thickness(mm) | ≤ 3 | + 12% - 10% | |
3 | ± 10% | ||
