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.
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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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Outokumpu has introduced a new service concept for pulp-mill machinery and equipment manufacturers, supplying an optimized package of prefabricated duplex 2205 plate sections for Metso ND to build digesters and reactors for the chemical cellulose producer Sappi Saiccor, both of South Africa.
Sandmeyer Steel Co. has added LDX 2101® (UNS-S-32101, EN1.4162) to its extensive line of corrosion resistant stainless steel and nickel alloy plate and plate products.
Baosteel is planning to build a special seamless steel pipe factory in 2009, with a designed capacity of 23,000tpy at an estimated investment of USD 37.5 million.
Gansu Lanke Petrochemical Equipment (Lanke), has successfully replaced conventional austenitic stainless steel of type 316L (1.4404) in plate air-cooler and plate shell heat exchangers with duplex 2205 (1.4462) from Outokumpu.
BUTTING has recently completed the largest single order for risers, wellheads and associated components for a longstanding customer in the well construction industry, for whom BUTTING supplied 8 wellheads and 408 risers.
The UK's oldest manufacturer of specialty wires, Webster & Horsfall, has replaced a gas furnace with an electrically heated furnace from Meltech Engineering, to cut energy costs and reduce the company's carbon footprint.
The Gateway Upgrade Project, to duplicate a motorway bridge across the Brisbane River in Australia’s Queensland, will use duplex LDX 2101® stainless steel reinforcement bar from Outokumpu.
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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