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duplex steels

Duplex Steels

Duplex Steels


20-30% Chromium, 5-8% Nickel, <0.03% Carbon, traces of Nitrogen, Molybdenum, Copper, Silicon and Tungsten.

Common Shapes

Duplex Steels are commonly available in

  • Sheets and Plates

  • Welded & Seamless Tubes and Pipes 

  • Rods

  • Bars

(Not all alloys or tempers available in all shapes)


  • Twice as strong as Austenitic Steels

  • Enhanced toughness

  • Increased ductility

  • Superior Chloride SCC resistance

  • Tensile yield strength of 550-690 Mpa

  • Upper service limit of 300°C


  • Pipes for the chemical industry

  • Pipes and machinery used in the Oil and Gas industries

  • Machinery and conduit pipes in paper mills

  • Environments where resistance to corrosive media such as aqueous solutions and chlorides.


Duplex Steels are generally weldable and should be treated in much the same way as Austenitic Stainless Steels.


Machining of Duplex Steels is not generally recommended due to their strength in the annealled condition.

Commonly Used Alloys (UNS)

S31200 | S31260 | S31500 | S31803 | S32304 S32550 | S32750 | S32760 | S32900

Integ Metals // Materials // Steel // Duplex Steel
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An Introduction

Duplex Steels are recognised for their unique microstructure: consisting of equal Ferrite and Austenitic phases and typically low Carbon content. They are the newest forms of Stainless Steel, used in roles where strength, high corrosion resistance and toughness, whilst still retaining formability, is required. Its properties and comparitive low mass, along with relative inexpense make it a useable alternative to Nickel.

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