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Duplex Stainless Steels

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.

SXP wins first API 5CRA certificate

Stainless Steel World Publisher - January 31, 2016

The American Petroleum Institute (API) has certified SXP, Mississippi, USA as the first company worldwide in accordance to API 5CRA, license number API 5CRA-0001. Schulz Xtruded Products was established in 2011, since when it has been focusing on catering hot extruded and cold finished high corrosion resistant pipe for the oil and gas industry.

Italfond and SpecialSteelStock sign agreement

Stainless Steel World Publisher - January 18, 2016

Italian steelmill ITALFOND S.P.A. and SpecialSteelStock - C.S.C. S.P.A, an Italian leading stockist have signed a significant exclusive distribution agreement on Nov, 27th, 2015.

Fine Tubes and Superior Tube at OTC Brasil

Stainless Steel World Publisher - January 11, 2016

Fine Tubes and Superior Tube Company had promoted their oil and gas tubing range at the recent OTC Brasil, one of the world’s foremost events for the development of offshore resources in the fields of drilling, exploration and production.

316L stainless steel filters

Stainless Steel World Publisher - January 10, 2016

Axium Process, filtration specialists has manufactured a comprehensive range of 316L stainless steel filters which are renowned for their robust construction, versatility, reliability and their ease and simplicity to maintain.

Outokumpu delivers 5000tonnes stainless steel

Stainless Steel World Publisher - December 15, 2015

Outokumpu has delivered 5,000tonnes of Forta LDX 2101 duplex stainless steel for the clarifier parts of two copper mines.

New opportunities for CENTRAVIS

Stainless Steel World Publisher - December 14, 2015

For years, the majority of car producers used welded or carbon tubes. But standards have risen. Now, the most innovative companies want more efficient and eco-friendly solutions, such as seamless stainless tubes, which is the core competence for Centravis. The welded tubes are good as long as the working pressure doesn’t exceed 300 bars.

ArcelorMittal brings back Mont Saint-Michel

Stainless Steel World Publisher - November 30, 2015

Mont Saint-Michel, the UNESCO-listed tourist hot spot located off France’s north-western coast, had been moving closer to the mainland due to silt build-ups caused by canal work at the Couesnon River.

Machining day proves a huge success

Stainless Steel World Publisher - November 24, 2015

Sandvik’s recent Machining day, held jointly by Sandvik Materials Technology and Sandvik Coromant at the company’s Halesowen facility proved to be a huge success, attracting more than 60 customers.

Norsk Alloys: latest Raccortubi Group addition

Stainless Steel World Publisher - October 27, 2015

On 23rd October, Raccortubi acquired Norsk Alloys, established in 2005 in Aberdeen (United Kingdom). Norsk Alloys Ltd focuses on the stockholding and supplying of specialist piping materials for the Oil & Gas industry, specifically for offshore platforms.

NORSOK super duplex approval for Fine Tubes

Stainless Steel World Publisher - October 27, 2015

Critical application precision tubing manufacturer Fine Tubes has received NORSOK approval to supply the oil and gas industry with UNS S32750 seamless straight length tubing in the wall thickness range of 1mm to 3.98mm.

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The advantages of Duplex Stainless Steels

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. There are several variants available, such as Duplex 2205, Superduplex 2507 or lean duplex with lower nickel content.

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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