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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.

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.

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.

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.

CENTRAVIS’ tubes meet German standards

Stainless Steel World Publisher - October 26, 2015

TÜV Rheinland Group has confirmed that CENTRAVIS met all requirements in the production of duplex steel tubes and has been granted the VdTUV 418 certification. CENTRAVIS, a global supplier of high quality stainless tubes, has confirmed that its duplex tubes are produced in accordance with German industrial standards. According to CENTRAVIS, this certification will ensure a 45% increase in the sale of duplex tubes in the German market. Photo courtesy of CENTRAVIS "Obtaining the TÜV Rheinland Group certificate will strengthen the company's position with regards to the supply of duplex steel tubes to Germany, where the company's products are in high demand,” said Head of Centravis Sales Germany, Nicholai Rosenthal.

High grade welding consumables

Stainless Steel World Publisher - October 12, 2015

BS FIXINGS produces stainless steel wire which adheres to the demanding specifications set out in AWS A5.9 and EN 14343, as well as ISO 9001 accreditation.

Raccortubi Group opens new UK office

Stainless Steel World Publisher - October 12, 2015

Raccortubi are pleased to announce the establishment of the Group’s newest addition: a branch office in the United Kingdom.

Raccortubi UK has been set up in order to provide Raccortubi Group with a local presence in the United Kingdom so as to better serve EPC contractors, fabricators and blue chip companies in the region.

Outokumpu delivers 245 tons of duplex

Stainless Steel World Publisher - September 29, 2015

Outokumpu has delivered one of the largest orders of 245 tons of Forta LDX 2101 lean duplex stainless steel for the construction of three big oil storage tanks at the Antwerp harbor in Belgium.

Stainless UK giant bars for Scottish quay

Stainless Steel World Publisher - September 27, 2015

Stainless UK have supplied 23 giant solid round stainless steel bars with a 5” diameter and 3m length for the construction of an extension to the quay at Campbeltown Harbour in Scotland.

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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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