20-30% Chromium, 5-8% Nickel, <0.03% Carbon, traces of Nitrogen, Molybdenum, Copper, Silicon and Tungsten.
Duplex Steels are commonly available in
Sheets and Plates
Welded & Seamless Tubes and Pipes
(Not all alloys or tempers available in all shapes)
Twice as strong as Austenitic Steels
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
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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.