Duplex Steel Fittings
Duplex Steel Fittings are specialized pipe fittings manufactured from duplex stainless steel alloys, combining the benefits of both ferritic and austenitic stainless steels. These fittings offer excellent strength, high corrosion resistance, and durability, making them ideal for use in demanding industrial environments such as oil and gas, chemical processing, petrochemical, marine, and desalination plants. Common types include elbows, tees, reducers, caps, and flanges, designed to withstand harsh conditions like chloride-induced corrosion, stress corrosion cracking, and pitting. Duplex steel fittings maintain structural integrity at elevated temperatures and under high pressure, providing reliable and long-lasting pipeline connections. They conform to industry standards such as ASTM A815, ASTM A182, and ASME specifications, ensuring compatibility and quality for critical piping systems.
Duplex Steel Fittings - Specifications
| Parameter | Description / Options |
|---|---|
| Material Grades | UNS S31803, UNS S32205, UNS S32750 (Super Duplex), ASTM A815, ASTM A182 |
| Standards | ASTM A815, ASTM A182, ASME B16.9, ASME B16.11, EN 10253-4 |
| Types | Elbows (45°, 90°, 180°), Tees (Equal & Reducing), Reducers (Concentric & Eccentric), Caps, Crosses, Stub Ends |
| Sizes | 1/2" to 24" (DN15 to DN600) and larger sizes on request |
| Pressure Ratings | Class 150, 300, 600, 900, 1500 |
| End Connections | Butt Weld (BW), Socket Weld (SW), Threaded, Flanged |
| Surface Finish | Pickled & Passivated, Polished, Mill Finish |
| Heat Treatment | Solution Annealed (typically 1020–1100°C) |
| Testing | Hydrostatic Test, PMI, NDT (Ultrasonic, Radiographic), Visual Inspection |
| Applications | Oil & Gas, Petrochemical, Chemical Processing, Marine, Desalination Plants |
Applications
| Application | Description |
|---|---|
| Marine Industry | Used in shipbuilding and offshore structures for corrosion resistance in seawater. |
| Oil & Gas | Ideal for pipeline construction and downhole applications in oil fields. |
| Chemical Processing | Fittings in systems with corrosive chemicals, particularly those with chloride presence. |
| Water Treatment | Piping systems for wastewater treatment and desalination. |
| Power Generation | For use in power plants, especially in systems handling high pressure and temperatures. |