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.
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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Sandvik Materials Technology has invested in and has now commissioned a new rolling mill for the production of stainless steel flat wire - a Sandvik speciality produced as an alternative to narrow strip.
Sandvik Materials Technology is using Offshore Europe 2003 (Aberdeen, UK, 2–5 September 2003) to promote its full range of stainless steel tubular products for topside, subsea and downhole use.
At Offshore Europe in September, Parker Instrumentation will expand its family of rapid-assembly, compression tube fittings for pressures up to 15,000lb/in2.
Parker Instrumentation has extended the versatility of its high-integrity manifold range, with new exotic alloy versions to assure corrosion-free performance in a wider range of fluid instrumentation applications.
At Offshore Europe, Parker Instrumentation will expand its breakthrough family of rapid-assembly, compression tube fittings for pressures up to 15,000 PSI.
Ongoing product development, including modifications and refinements to the steel chemistry, have enabled Sandvik Materials Technology to further enhance the machinability of Sandvik Sanmac grade SAF 2205 duplex stainless steel round bar.
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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