Duplex Stainless Steel: Built for the Extreme
Duplex stainless steels are high-performance alloys combining austenitic and ferritic stainless steel properties. Known for their strength and corrosion resistance, they’re used in the most demanding industrial environments.
Structure and Properties
Mixed Phase: Roughly 50% austenite and 50% ferrite.
High Strength: Almost twice that of 304 or 316 stainless.
Corrosion Resistance: Excellent against pitting and stress corrosion.
Weldability: Generally good, but requires careful control.
Popular Grades
S31803/S32205: Common duplex grades with balanced properties.
S32750/S32760: Super duplex grades for highly corrosive environments.
Applications
Oil and Gas: Pressure vessels, subsea piping.
Chemical Processing: Reactors, heat exchangers.
Desalination Plants: Filters, evaporators.
Pulp and Paper: Digesters, bleach washers.
Duplex stainless steels are the material of choice when reliability, strength, and corrosion resistance are non-negotiable.