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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CMI Enterprise serves the pharmaceutical, cosmetic, and chemical industries. The company has also had opportunities to expand its other process equipment and heat exchanger business for the high purity and power generation industries.
NSF International has announced that NSF/ANSI Standard 61, drinking water system components - health effects, has been expanded to allow additional types of stainless steel as acceptable materials for products used in drinking water applications.
Allegheny Technologies Inc. has announced that ATI Allegheny Ludlum is
increasing selling prices for cold-rolled stainless steel sheet and strip
products, including duplex alloys and auto exhaust alloys.
Global subsea contractor, Subsea 7 has announced a contract award valued in the region of USD 6.8 million by Allseas for the Woodside Otway Gas Project, located in the Bass Straits offshore Australia in water depths of approximately 100m.
The established range of Labfacility’s Thermocouple and PRT sensors have been enhanced to meet the needs of many applications. Standard configurations or custom made assemblies are offered in calibrations, types J, K, N, R, S and B.
Boll & Kirch, a manufacturer of automatic filtration equipment, has launched a new range of liquid and gas filters – showing for the first time at Offshore Europe 2005.
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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