March 7, 2023
Super duplex seamless pipe is one of the types of austenitic-ferritic iron chromium alloy. There are different categories such as standard duplex, super duplex and lean duplex. The lean duplex pipes are the least used due to high cost and the standard duplex pipes are the most used. GNEE is a leading manufacturer of super duplex pipe in seamless and welded pipe types. The super duplex material is very strong and has very high corrosion resistance. The pipes have high thermal conductivity. So the welding procedure does not overheat the pipes. The super duplex seamless pipe transfers the welding heat so hot cracking is very less.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| S32760 | 0.05 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.00 – 26.00 | 3.00 – 4.00 | 6.00 – 8.00 | 0.20 – 0.30 | 57.61 min |
Super Duplex Pipe Material Testing:
Mechanical Testing Such as Tensile of Area
Hardness Test
Chemical Analysis – Spectro Analysis
Positive Material Identification – PMI Testing
Flattening Test
Micro and MacroTest
Pitting Resistance Test
Flaring Test
Intergranular Corrosion (IGC) Test
