A790 S32750 Super Duplex Steel Seamless Pipe for Power Generation
ASTM A790 UNS S32750 super duplex seamless pipe is a high-strength, corrosion-resistant material ideally suited for power generation applications due to its excellent resistance to chloride pitting and crevice corrosion. Key properties include high mechanical strength, combining the characteristics of austenitic and ferritic stainless steels, and suitability for harsh environments and temperatures below 316°C (600°F). These pipes conform to ASTM A790/ASME SA790 standards and are available in a variety of sizes, specifications, and surface finishes.
What is ASTM A790 S32750 material?
ASTM A790 UNS S32750 pipe belongs to the super-duplex stainless steel category. Because its yield strength is twice that of austenitic stainless steel, it can be used to manufacture thinner gauge pipe. Its microstructure is 50% ferrite and 50% austenite.
UNS S32750 is a high-chromium, high-molybdenum, high-nitrogen, low-carbon stainless steel with excellent corrosion resistance and high strength. It performs well in high-chloride and acidic environments and is widely used in the chemical, oil, and gas industries. Heat treatment alters the structure and properties of UNS S32750 through heating and cooling processes. Carbon is a key alloying element in UNS S32750 and significantly influences its properties.
Chemical Analysis of S32750 Duplex Steel Seamless Pipe
| 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 S32750 Duplex Steel Seamless Pipe
| 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 Duplex Steel Seamless 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 |
Power Generation Applications
Ideal for the harsh environments common in power plants, such as those containing corrosive chemicals or highly saline water.
Can be used in heat exchangers, condensers, and other critical systems requiring a balance of strength and corrosion resistance.
A durable alternative to standard stainless steels such as 316L and 22% duplex.
Availability and Services
Sizes: Available in a wide range of diameters and wall thicknesses, often with large-diameter options.
Pipe Sizes: Available in a variety of diameters, including SCH10S, SCH40, and SCH80.
Surface Finishes: Available in AP, BA, No. 1, 2B, and polished finishes.
Shapes: Available in round, seamless shapes, with suppliers offering value-added services such as annealing, bending, and machining.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
