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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After years of partnership between Xstrata Technology and Outokumpu, the two companies have reached a new height with a joint product development to turn...
The Nickel Institute has launched a new online training module designed to assist English and Chinese-speaking engineers, designers and those who specify materials to select an appropriate type and grade of stainless steel for their particular needs.
Sandmeyer Steel Co. has added SSC-6MO (UNS N08367) to its extensive line of corrosion-resistant stainless steel and nickel alloy plate and plate products.
Stahlkontor Hahn (SKH) (a division of ThyssenKrupp Materials International), master distributor for austenitic seamless stainless steel tubes and pipes up to 20in NPS, has extended its stock range for special grades.
Outokumpu has announced an EUR 550 million investment, over the next three years, in stainless steel special grades capacity in its Avesta Works in Sweden.
Australian Stainless Steel Development Association (ASSDA) has outlined new and emerging stainless steel grades, which may be considered as alternatives to the traditional and widely known varieties.
Nippon Steel & Sumikin Stainless (NSSC), has announced an agreement with Outokumpu to acquire the European stainless mill's technology for producing its LDX 2101 grade duplex stainless.
The MARAFIQ desalination plant in Saudi Arabia, built by SIDEM of France, uses 10,000tns of duplex stainless steel in grades SAF 2304® and 2205 from Outokumpu, out of a total quantity of 16,500tns for the plant.
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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