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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Special Quality Alloys Ltd have successfully been granted the Pressure Equipment Directive (PED) 2014/68/EU approval. The approval applies to the design, manufacture and conformity assessment of stationary pressure equipment with a maximum allowable pressure greater than 0,5 bar.
Nippon Steel and Sumikin Stainless Corp. have won the Gold and Bronze awards in the categories for Best New Technology and Best New Development at the International Stainless Steel Forum (ISSF) held in Shanghai in May this year.
Shijiazhuang An Pump Machinery Co., Ltd is a professional chemical pump manufacturer with professional furnish and equipment for stainless steel and duplex stainless steel.
2205 Duplex Stainless Steel Mesh includes wire mesh, perforated metal and expanded metal. It is known for providing excellent mechanical and anti-corrosive features.
Fortune Chinese recently published the list of China's top 500 companies in 2018. STSS once again ranked among the top 500 Chinese companies with an operating income of 67.
GN Solids Control said that the fabrication of one fully hydraulic decanter centrifuge unit has been completed. The decanter centrifuge is ordered by a client from Middle East.
Amarinth, a company specialising in the design, application and manufacture of centrifugal pumps and associated equipment to the Oil & Gas, petrochemical, chemical, industrial and power markets, has delivered $500K of API 610 OH2 pumps to Schlumberger which will be deployed on a process water treatment package in the Dunga oil field, Kazakhstan, operated by Maersk Oil.
How can you tell a Super-Duplex Stainless Steel from an Austenitic Stainless Steel, or a Nickel Alloy from a Copper Alloy when they all largely look the same? That’s the problem experienced by many of the organisations in the supply chain.
Sandvik SAF 2304® is a lean duplex (austenitic-ferritic) stainless steel characterized by the following properties: Very good resistance to stress corrosion cracking (SCC), good resistance to general corrosion and pitting, high strength - approximately twice the proof strength of austenitic stainless steels, physical properties that offer design advantages, ease of fabrication and good toughness and good weldability.
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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