Duplex Stainless Steel is a high-performance category of stainless steels characterized by a balanced microstructure of austenite and ferrite (approximately 50% each). This dual-phase structure delivers superior mechanical strength, excellent corrosion resistance, and outstanding resistance to stress-corrosion cracking compared to conventional stainless steel grades.
Duplex stainless steels are widely used in industries that demand durability, strength, and long-term reliability in harsh and corrosive operating environments.
Typical Mechanical Properties
(Values vary depending on grade such as 2205, 2507, 2304, etc.)
| Property | Typical Range |
|---|---|
| Tensile Strength | 620 – 800 MPa |
| Yield Strength (0.2%) | 450 – 550 MPa |
| Elongation | 25 – 30% |
| Hardness | 28 – 32 HRC (approx.) |
| Impact Strength | High, even at low temperatures |
| Corrosion Resistance | Excellent in chlorides, seawater & acidic media |
Available Forms
✔ Plates & sheets
✔ Coils
✔ Bars (round, square, hex)
✔ Pipes & tubes (seamless / welded)
✔ Pipe fittings (elbows, tees, reducers)
✔ Flanges
✔ Wires & rods
✔ Forgings and custom-engineered components
Applications
Oil & Gas Industry
Offshore platforms, subsea pipelines, heat exchangers, pressure vessels
Chemical & Petrochemical
Process piping, reactors, storage tanks
Marine & Shipbuilding
Seawater handling systems, desalination plants, propulsion components
Pulp & Paper
Digesters, bleaching equipment, evaporators
Construction & Structural
Bridges, reinforcement bars, structural components exposed to corrosive
environments
Water Treatment
RO plants, water distribution systems, high-chloride service applications
Why Choose Duplex Stainless Steel
Duplex stainless steel is selected when high strength, superior corrosion resistance, and long service life are essential. Its ability to outperform standard austenitic grades while allowing reduced section thickness makes it a cost-effective and reliable solution for oil & gas, marine, chemical, water treatment, and structural applications.