Duplex Steel Flanges are high-performance stainless steel piping components known for their exceptional strength, superior corrosion resistance, and excellent resistance to stress corrosion cracking. These flanges combine the advantages of austenitic and ferritic stainless steels, making them ideal for demanding industrial environments.
Duplex Steel Flanges are manufactured through forging and precision machining and are widely used in high-pressure and corrosive service piping systems across oil & gas, chemical processing, marine, power generation, and offshore industries.
Duplex Steel Flanges are available in standard duplex grades to suit various operating conditions. The most commonly supplied grades include Duplex S31803 (UNS S31803) and Duplex S32205 (UNS S32205), offering excellent corrosion resistance, high mechanical strength, and long service life.
Duplex Steel Flange Manufacturer in India | Duplex S31803 & S32205 Flange Supplier
Applications of Duplex Steel Flanges
| ● Oil & Gas Industry and Offshore Platforms |
| ● Chemical & Petrochemical Processing Plants |
| ● Heat Exchangers, Pressure Vessels & Piping Systems |
| ● Marine & Seawater Applications |
| ● Power Generation & Desalination Plants |
| ● Refineries and High-Pressure Process Lines |
Specification Table of Duplex Steel Flanges
| Standard | ASTM A182 / ASME SA182, ASME B16.5, ASME B16.47 |
|---|---|
| Grades | UNS S31803, UNS S32205 |
| Size | 1/2″ NB to 48″ NB |
| Pressure Class | 150, 300, 600, 900, 1500, 2500 |
| Flange Types | Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint |
| Surface Finish | Machined, Pickled, Polished |
Duplex Steel Flange Grades
| ● Duplex S31803 – Standard duplex grade offering excellent corrosion resistance, high yield strength, and good weldability |
| ● Duplex S32205 – Enhanced duplex grade with improved resistance to pitting, crevice corrosion, and stress corrosion cracking |
Mechanical Properties of Duplex Steel Flanges (Typical)
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation % |
|---|---|---|---|
| Duplex S31803 | 450 | 620 | 25 |
| Duplex S32205 | 450 | 620 | 25 |