Duplex

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    Duplex Stainless Steels

    Duplex stainless steels have a ferritic-austenitic microstructure, in roughly equal proportions 50% ferrite and 50% austenite. Duplex combines many of the attractive properties of ferritic and austenitic stainless steels into one.

    Discover the latest innovations in duplex technology with our exclusive Duplex World Update. Download this comprehensive 3-part series now and gain valuable insights from industry experts on groundbreaking applications and developments in duplex material science.

    Different variants for Duplex

    Duplex stainless steels are designed to provide better corrosion resistance, in particular to stress corrosion and pitting corrosion. The microstructure leads to higher strength than standard austenitic stainless steels such as Type 304 or 316. Duplex stainless steels have become more and more popular in recent years. There are several variants available, such as Duplex 2205, Superduplex 2507 or lean duplex with lower nickel content.

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    Borger pump completes a decade at abrasive brewery

    Borger pump completes a decade at abrasive brewery

    Stainless Steel World Publisher -
    A rotary lobe Borger pump with duplex stainless-steel casing has completed a decade of service at a major brewery.
    VERTEX Keg: Duplex Stainless Steel Keg

    VERTEX Keg: Duplex Stainless Steel Keg

    Stainless Steel World Publisher -
    THIELMANN has developed a beverage keg made by using a special technique to mold duplex stainless steel
    John Houben won Duplex World Lifetime Achievement Award

    John Houben won Duplex World Lifetime Achievement Award

    Stainless Steel World Publisher -
    John Houben, Global Principal Materials Engineer at ExxonMobil EMTEC, has been awarded the Duplex World Lifetime Achievement Award. 
    Oliver Twinsafe delivers super duplex valves

    Oliver Twinsafe delivers super duplex valves

    Stainless Steel World Publisher -
    Oliver Twinsafe has dellivered two substantial 12″ Class 1500 Super Duplex valves for the Shell Jackdaw platform in the North Sea
    Prelude’s LNG and LPG are offloaded via a side-by-side vessel configuration using specially designed cryogenic loading arms. Shell’s Dual Mixed Refrigerant (DMR) process is used to liquefy the gas. Ships load condensate from the rear of the facility using a floating hose arrangement. The products are shipped directly to customers around the world. Pictured is LNG carrier Gallina berthed alongside Prelude. Photo ©Shell

    Prelude still going strong

    Stainless Steel World Publisher -
    At 488 meters, Prelude is still the largest FLNG in the world. Joanne McIntyre gives an update on the 2015 Stainless Steel World article.
    Figure 2. Typical microstructure of root pass using HDSS (27% Cr, 7% Ni, 5% Mo) wire. The bright phase is austenite, and the dark phase is ferrite.

    Hyper duplex stainless steel: a sustainable choice for high-performance applications

    Stainless Steel World Publisher -
    Dr Vahid A. Hosseini (ESAB) explains what must be considered when choosing welding filler material in hyper duplex stainless steels
    Figure 6. Skim machined sealing faces of mechanical joints in pipe spools.

    Super duplex stainless steels in Seawater Reverse Osmosis applications

    Stainless Steel World Publisher -
    Dr Glenn Byrne and Mr Nicholas Hicks explain why super duplexes are the alloy of choice for seawater reverse osmosis plants
    Alleima introduces a super-duplex alloy: SAF™ 3006

    Alleima introduces a super-duplex alloy: SAF™ 3006

    Stainless Steel World Publisher -
    Alleima's SAF™ 3006: High-alloy duplex steel enhances corrosion resistance in harsh environments.
    Dr Yassar Ghanimi - Andritz AG

    Have your say at Duplex World Conference & Expo

    Stainless Steel World Publisher -
    The deadline to submit an abstract for the Duplex Conference (held in Rotterdam, 6-7 November 2024), approaches rapidly.
    Swiss Steel launches UGIMA®-X martensitic & duplex steels

    Swiss Steel launches UGIMA®-X martensitic & duplex steels

    Stainless Steel World Publisher -
    Swiss Steel Group has extended their UGIMA product range with the launch of UGIMA®-X Martensitic and Duplex steels
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    The advantages of Duplex Stainless Steels

    Corrosion Resistance: Duplex stainless steel has excellent corrosion resistance due to its high chromium and molybdenum content. It is particularly resistant to stress corrosion cracking and pitting, which makes it suitable for use in harsh environments.

    Strength: Duplex stainless steel is much stronger than conventional austenitic stainless steels, which allows for thinner and lighter constructions without sacrificing durability.

    Toughness: Duplex stainless steel has a high toughness, which means it is resistant to brittle fracture and impact. This property makes it suitable for use in cryogenic applications.

    Cost-effectiveness: Although duplex stainless steel is more expensive than conventional austenitic stainless steels, its superior properties can lead to cost savings in the long run by reducing maintenance and downtime.

    Versatility: Duplex stainless steel can be used in a wide range of applications, including chemical processing, oil and gas, marine, and pulp and paper industries. It is also used in construction and architecture due to its aesthetic appeal.

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