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Duplex & Super Duplex Steel

Ashwin Steel supplies advanced Duplex and Super Duplex stainless steels, characterized by their dual-phase microstructure (ferritic and austenitic). This unique structure yields material that is roughly twice as strong as standard 304/316 grades, while offering exceptional resistance to stress corrosion cracking, especially in chloride-rich environments.

Duplex & Super Duplex Steel

Available Grades

UNS S31803 / S32205 (Duplex 2205)UNS S32750 (Super Duplex 2507)

Key Specifications

Sizes

Various across pipes, plates, and bars

Thickness

Variable

Standards

ASTM A790, A240

Forms

Pipes, Fittings, Plates, Flanges

Finishes

Mill Finish, Machined

Specifications

Microstructure50% Austenitic, 50% Ferritic
Key Grades2205, 2507
Yield StrengthDouble that of standard austenitic grades

Applications

  • Desalination Plants
  • Offshore Oil & Gas
  • Chemical Tankers
  • Pulp & Paper Digesters

Frequently Asked Questions

Frequently Asked Questions

Duplex refers to the two-phase microstructure of the metal, consisting of nearly equal proportions of austenite and ferrite. This structure combines the benefits of both phases.
Super Duplex contains higher levels of chromium, molybdenum, and nitrogen, giving it an even higher PREN (Pitting Resistance Equivalent Number) value than standard Duplex, ideal for highly corrosive offshore environments.
Yes, because of its high yield strength, you can often use a thinner gauge of Duplex steel compared to 316L for the same structural integrity, reducing overall weight and material costs.

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