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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.

Thyssenkrupp severs stainless division

Stainless Steel World Publisher - May 9, 2011

CEO of ThyssenKrupp, Heinrich Hiesinger, has announced that the company is splitting off its stainless division so that more of its sales fall to other divisions. As a result of the split, more than 35,000 workers will be let go. The main reason for splitting off the division comes as a result of overall debt, according to Hiesinger. The stainless steel division has been running at a loss over past few years with last year's turnover amounting to EUR 5.9 billion.

Stratman new exec vice president

Stainless Steel World Publisher - May 9, 2011

R. Joseph Stratman, executive vice president of Nucor Corp., Charlotte, N.C., USA, has been appointed president of the Association for Iron & Steel Technology (AIST) for 2011–2012. He will succeed former president William P. Breedlove, executive vice president, marketing and business development, Harsco Metals and Minerals, Seven Fields, Pa., USA. Stratman has been an Executive Vice President of Nucor since September 2007

Turku bridge to be clad in stainless

Stainless Steel World Publisher - April 18, 2011

The new Myllysilta bridge to be constructed in Turku will have a modern stainless steel cladding. The cladding will be made out of Outokumpu duplex stainless steel. The new bridge is scheduled for completion next autumn as the original Myllysilta bridge began to sag downwards in March 2010 and had to be demolished. WSP received the design competition award arranged by the city of Turku with their Myllyn Teräs bridge proposal.

TITAN opens new facilities in India

Stainless Steel World Publisher - March 25, 2011

TITAN Metal Fabricators has opened a wholly-owned production subsidiary in India. TITAN Metal Fabricators India is TITAN’s first expansion outside of the United States. This new operation includes manufacturing facilities in Mathura, 90mi south of New Delhi

AD Tubi enters North American Market

Stainless Steel World Publisher - March 17, 2011

A.D.Tubi Inossidabili SpA will expand into North America, Mexico, and the South and Central American markets in partnership with Kipp International Steel Sales.

Sandvik and Vasa Museum to save national treasure

Stainless Steel World Publisher - March 10, 2011

The Vasa Museum and Sandvik are taking on a critical project to replace 5000 wrought iron bolts on the Swedish heritage vessel. A national treasure, Vasa capsized and sank in 1628 as it prepared for its maiden voyage; it was raised from the bottom of the harbour in 1961 and carefully restored.

TISCO duplex output set record high for 2010

Stainless Steel World Publisher - February 28, 2011

TISCO achieved a significant increase in duplex steel production for 2010, producing a total development amount of 1000tns. This is an increase by 66% compared to 2009, fully replacing imported products.

Allied Group acquires Gieminox

Stainless Steel World Publisher - February 25, 2011

Tectubi Raccordi, a subsidiary of Allied Group, has acquired a majority share in Gieminox S.R.L., a consolidated manufacturer of longitudinal welded pipes, fittings and auxiliary components in stainless steel, nickel and nickel alloys, duplex and superduplex.

Molybdenum production increases

Stainless Steel World Publisher - February 16, 2011

Figures released by the International Molybdenum Association (IMOA) revealed that world-wide production of molybdenum continued to increase during the third quarter of 2010, although usage fell.

Lucefin acquires KSM

Stainless Steel World Publisher - February 14, 2011

Trafilix SpA has taken over KSM SAMA DE GmbH from Sama Inox Group. Established in 1979, KSM is located in Empfingen, south of Stuttgart in the southern German region of Baden-Württemberg.

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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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