Super Duplex Steel Flanges are high-performance components designed for demanding applications in aggressive environments. Made from super duplex stainless steel, these flanges offer an excellent combination of high strength, superior corrosion resistance, and durability, particularly against stress corrosion cracking and chloride-induced corrosion. Commonly used in the oil and gas, chemical processing, marine, and petrochemical industries, super duplex steel flanges provide reliable connections in piping systems where both mechanical integrity and resistance to harsh conditions are critical. They conform to rigorous international standards and are available in various types such as weld neck, slip-on, blind, threaded, and socket weld to suit different installation requirements.
| Parameter | Description / Options |
|---|---|
| Material Grade | UNS S32750, S32760, ASTM A182 F53, F55 |
| Standards | ASTM A182, ASTM A403, ASME B16.5, ASME B16.47, EN 1092-1 |
| Types | Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint |
| Sizes (Diameter) | 1/2″ to 72″ (DN 15 to DN 1800) |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 |
| Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Surface Finish | Mill Finish, Shot Blasted, Polished |
| Heat Treatment | Solution Annealed (typically at 1050–1150 °C) |
| Testing | Hydrostatic Test, PMI (Positive Material Identification), NDT (Ultrasonic, Radiographic) |
| Corrosion Resistance | Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking |
| Applications | Oil & Gas, Chemical Processing, Marine, Petrochemical, Desalination Plants |
| Flange Type | Description | Applications |
|---|---|---|
| Weld Neck Flange | Features a long tapered neck that is welded directly to the pipe. | Critical for high-pressure systems, reactors, offshore platforms. |
| Slip-On Flange | Slip over the pipe and then welded both inside and outside. | Used in low-pressure, non-critical applications in refineries. |
| Socket Weld Flange | A flange with a socket for the pipe to be inserted and welded. | Common for high-pressure, small-bore piping systems. |
| Blind Flange | Used to seal the end of a pipe or valve. | Used for closing pipes, vessels, or equipment during maintenance. |
| Threaded Flange | Flange with internal threads that screw directly onto the pipe. | Ideal for low-pressure applications where welding isn’t feasible. |
| Lap Joint Flange | Designed for easy disassembly, fits over a stub end of the pipe. | Perfect for applications requiring easy access and inspection. |
| Orifice Flange | Contains a built-in orifice for fluid flow measurement. | Used in flow measurement, especially in high-pressure pipelines. |
| Ring-Type Joint Flange | Flange with grooves for metal ring gaskets. | Common in critical high-pressure systems, such as in offshore drilling. |
| Expander Flange | Connects pipes of different diameters. | Used to accommodate different pipe sizes in the same system. |
| Reducing Flange | Connects pipes of different diameters, reducing the size of the pipe. | Used for pipe transitions in pressurized systems. |
| Long Weld Neck Flange | Similar to Weld Neck, but with a longer neck for added strength. | Used in systems with high pressure and temperature variations. |
