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Duplex/Super Duplex

Duplex/Super Duplex

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Duplex & Super Duplex Alloys

Duplex and Super Duplex stainless steels are a class of alloys that combine the beneficial properties of austenitic and ferritic stainless steels. Known for their high strength, excellent corrosion resistance, and stress corrosion cracking resistance, these alloys are ideal for demanding environments such as offshore platforms, chemical processing plants, desalination facilities, and heat exchangers.

  • Excellent resistance to chloride stress corrosion cracking and pitting
  • Higher strength than conventional austenitic stainless steels
  • Superior weldability and fatigue resistance
  • Ideal for seawater, oil & gas, and aggressive chemical applications

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Duplex & Super Duplex: Advanced Stainless Steels for Extreme Conditions

Duplex and Super Duplex stainless steels are engineered for exceptional strength and corrosion resistance, combining both austenitic and ferritic structures. These alloys are specifically designed for aggressive environments involving chloride exposure, high pressure, and temperature variations—making them indispensable in offshore platforms, desalination plants, and petrochemical systems.

duplex-superduplex-alloy
Superior Corrosion Resistance

Duplex and Super Duplex resist stress corrosion cracking, pitting, and crevice corrosion—especially in environments with high chloride content such as seawater and brine.

Protection
High Mechanical Strength

These alloys offer nearly twice the yield strength of conventional austenitic stainless steels, making them ideal for structural and load-bearing applications.

Strength
Excellent Weldability & Workability

Duplex steels can be welded and formed with minimal risk of cracking, maintaining their integrity across a wide range of industrial manufacturing processes.

Fabrication
Extended Service Life in Harsh Conditions

Their combination of toughness and corrosion resistance makes them the preferred material in oil & gas, marine, chemical, and desalination sectors.

Reliability





Our Duplex & Super Duplex Offerings

We supply a wide selection of Duplex and Super Duplex stainless steel products for mission-critical applications in challenging environments:

  • Plates & Sheets: Ideal for tanks, vessels, and structural components in high-pressure and corrosive settings.
  • Bars & Rods: High-strength options for machined parts and load-bearing components.
  • Pipes & Tubes: Widely used in subsea pipelines, chemical transport, and heat exchanger systems.
  • Fasteners: Engineered bolts, nuts, and washers built to withstand saltwater and acidic media.
  • Forged Fittings & Flanges: Precision-forged parts suitable for offshore, oil & gas, and desalination applications.
  • Welding Consumables: Duplex-compatible electrodes and wires for robust and corrosion-resistant welds.





Duplex Grades

Duplex 2205
Super Duplex 2507
Duplex UNS S31803
Super Duplex UNS S32750

Main Alloying Elements

Chromium (21–26%)
Nickel (4.5–8%)
Molybdenum (2.5–4%)
Nitrogen (0.1–0.3%)
Iron (Balance)

Key Properties

High resistance to chloride-induced corrosion
Twice the strength of standard austenitic stainless steels
Excellent stress corrosion cracking resistance
Good weldability and formability
Suitable for aggressive marine and chemical environments