Super duplex Stainless Steel pipes produced under specification ASTM A790, are supplied in a seamless or a welded construction. The automatic process used to manufacture Super Duplex Welded Pipe is without the use of a filler metal. The Super Duplex Pipe suppliers recommend using these pipes for applications that are prone to general corrosion resistance. There are several reasons that account for the corrosion resistance properties of the ASTM A790 UNS S32760 Stainless pipe. In addition to having a high content of molybdenum, nickel and chromium, there is a significant inclusion of austenite stabilizing element, nitrogen. A heat analysis is performed on the ASTM A790 UNS S32750 in order to determine the proportion of the elements specified herein.
Next, the mixed microstructure of the Super Duplex 2507 SS Pipe enhances its properties. For instance, the ferritic part of the duplex microstructure in the alloy of the pipe is responsible for the Super Duplex 2507 Seamless Pipe exhibiting superior resistance to stress related corrosion cracking, particularly when exposed to warm chloride ion bearing circumstances. Generally, tests such as flattening tests, hardening tests, hydrostatic tests, Tension tests and nondestructive electric tests are performed on the Super Duplex Seamless Pipe to ascertain their conformance to the ASTM A790.
Super Duplex Steel Seamless S32750 Tubes Specification :
| Specifications | : | ASTM A789 / SA 789 |
| Size | : | 1/2"NB TO 12 "NB IN |
| Thickness | : | 0.5-45mm |
| Outer Diameter | : | 6.0-630mm |
| Dimensions | : | OD(6.0-630)*WT(0.5-45)mm |
| Length | : | Single Random, Double Random & Cut Length |
| Schedule | : | SCH20, SCH30, SCH40, STD, SCH80 |
ASTM A789 S32750 Super Duplex Steel Stainless Seamless Tubes Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. |
| Super Duplex 2507 | S32750 | 1.4410 |
UNS S32750 Super Duplex Steel Seamless Tube Chemical Composition
| C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| 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 |
Seamless Ferritic/Austenitic Super Duplex Super Duplex Steel 1.4410 Tubes Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
