ASTM A790 is a ASTM International standard specification for seamless and welded duplex stainless steel pipe, designed for general corrosive service, particularly emphasizing resistance to stress corrosion cracking.
GNEE provides ASTM A790 UNS S32750 super duplex stainless steel seamless pipes with a pitting resistance equivalent number (PREN) ≥40, tensile strength of 795 MPa, yield strength of 550 MPa, and elongation of 15%.
UNS S32750 pipes feature outer diameters ranging from 1/2 inch to 24 inches (DN15–DN600) and wall thicknesses of 1.6–25.4 mm, formed through cold/hot extrusion or piercing and rolling processes to ensure a seamless (weld-free) structure that enhances overall reliability. Surface finishes include pickled, polished, or rolled options, with multiple specifications available as ready stock.
Chemical Analysis of UNS S32750 Super Duplex Steel Pipes
| C | N | P | Si | Mn | Mo | Ni | Cr | S | Other |
| 0.030 | 0.24/0.32 | 0.035 | 0.80 | 1.20 | 3.0/5.0 | 6.00/8.00 | 24.0/26.0 | 0.020 | Cu:0.50 |
Mechanical Properties of UNS S32750 Super Duplex Stainless Steel Pipes and Tubes
| Pipe Density | Pipe melting point | Pipe yield strength | Pipe tensile trength | Pipe elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi - 80000 , MPa - 550 | Psi - 116000 , MPa - 800 | 15 % |
Physical Properties of S32750 pipe
| Density (Kg.m-1) | 7810 |
| Magnetic Permeability | 33 |
| Young's Modulus (N/mm2) | 199 x 103 |
| Specific Heat, 20°C (J.Kg-1.°K-1) | 475 |
| Fracture Toughness, Kq (MPa.m) | 475 |
| Specific Electrical Resistance, 20°C (µO.m) | 0.80 |
| Thermal conductivity, 20°C (W.m-1.°K-1) | 14.2 |
| Mean coefficient of thermal expansion, 20-100°C (°K-1) | 11.1 x 10-6 |
| Additional Testing | |
| ASTM G48A corrosion test at 40°C | No pitting and weight loss <4.0g/m2 |
| Ultrasonic Testing | According to ASTM A388 |
| Ferrite Content | 35%-55% |
| Microstructure | Microstructure certified free from grain boundary carbides, sigma, chi and laves phases |
upplementary Testing
Apart from the above mentioned tests, we also carry out on the manufactured products supplementary testing.
The tests conducted under this include:
|
Eddy Current Testing O.P Testing Radiography Testing |
Corrosion Testing Micro Testing Macro Testing |
IGC Testing Ultrasonic testing Liquid Penetrate testing |
If you have project requirements for ASTM A790 S32750 Super Duplex Steel Pipe, please feel free to place an order. GNEE has a large inventory of popular products for you to choose from. Available in both seamless and welded configurations, contact our factory for detailed chemical composition and free samples. We offer competitive pricing and excellent service.
Packaged in waterproof paper and steel strapping, these products meet standard export seaworthy packaging requirements and are suitable for various shipping methods or customized to your specifications.
