Duplex Welded Pipes Tubes is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.
The full identification of the pipe should be continuously marked down its whole length, including:
Nominal Pipe Size (Nominal Bore)
Schedule (Wall Thickness)
Specification
Grade
Method of Manufacture (Seamless or Welded)
Heat Number
Manufacturer's Name or Symbol
Duplex Welded Pipes Tubes Specifications :
| DN | NPS(Inch) | D(mm) | SCH5S | SCH10S | SCH10 | SCH20 | SCH30 | STD | SCH40 | SCH60 | SCH80 | XS |
| 300 | 12 | 323.9 | 3.96 | 4.57 | - | 6.35 | 8.38 | 9.53 | 10.31 | 14.27 | 17.48 | 12.7 |
| 350 | 14 | 355.6 | 3.96 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 11.13 | 15.09 | 19.05 | 12.7 |
| 400 | 16 | 406.4 | 4.19 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 12.7 | 16.66 | 21.44 | 12.7 |
| 450 | 18 | 457.2 | 4.19 | 4.78 | 6.35 | 7.92 | 11.13 | 9.53 | 14.27 | 19.05 | 23.83 | 12.7 |
| 500 | 20 | 508 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | 15.09 | 20.62 | 26.19 | 12.7 |
| 550 | 22 | 559 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | - | 22.23 | 28.58 | 12.7 |
| 600 | 24 | 610 | 5.54 | 6.35 | 6.35 | 9.53 | 14.27 | 9.53 | 17.48 | 24.61 | 30.96 | 12.7 |
| 650 | 26 | 660 | - | - | 7.92 | 12.7 | - | 9.53 | - | - | - | 12.7 |
| 700 | 28 | 711 | - | - | 7.92 | 12.7 | 15.88 | 9.53 | - | - | - | 12.7 |
| 750 | 30 | 762 | 6.35 | 7.92 | 7.92 | 12.7 | 15.88 | 9.53 | - | - | - | 12.7 |
| 800 | 32 | 813 | - | - | 7.92 | 12.7 | 15.88 | 9.53 | 17.48 | - | - | 12.7 |
| 850 | 34 | 864 | - | - | 7.92 | 12.7 | 15.88 | 9.53 | 17.48 | - | - | 12.7 |
| 900 | 36 | 914 | - | - | 7.92 | 12.7 | 15.88 | 9.53 | 19.05 | - | - | 12.7 |
| 950 | 38 | 965 | - | - | - | - | - | 9.53 | - | - | - | 12.7 |
| 1000 | 40 | 1016 | - | - | - | - | - | 9.53 | - | - | - | 12.7 |
| 1050 | 42 | 1067 | - | - | - | - | - | 9.53 | - | - | - | 12.7 |
| 1100 | 44 | 1118 | - | - | - | - | - | 9.53 | - | - | - | 12.7 |
| 1150 | 46 | 1168 | - | - | - | - | - | 9.53 | - | - | - | 12.7 |
| 1200 | 48 | 1219 | - | - | - | - | - | 9.53 | - | - | - | 12.7 |
