Duplex Stainless Steel

Duplex stainless steels have a balanced microstructure mixture of ferrite and austenite phases in the solution annealed condition.

Chromium and nickel are the principal alloying elements in duplex steels, but nitrogen, molybdenum, copper, silicon, and tungsten are often used to control structural balance, mechanical properties and corrosion-resistance characteristics.

Corrosion Resistance -- The low carbon content and high chromium content make the duplex alloys relatively immune to intergranular corrosion.  

• The high chromium and molybdenum content also provide a high degree of resistance to pitting and crevice corrosion, while the duplex microstructure resists stress corrosion cracking.

The duplex stainless steels have higher tensile and yield strengths  than austenitic alloys with a fracture toughness between that of austenitic and ferritic alloys.

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