Tag: duplex

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.

Bow Orion enters Odfjell’s fleet

Stainless Steel World Publisher -
Bow Orion, the first of four new designed and new built chemical tankers, departed for Ulsan recently where it will load its first cargo.

TISCO duplex stainless steel applied to Slowson bridge

Stainless Steel World Publisher -
TISCO duplex stainless steel has been successfully applied to the Slowson steel structure bridge project in Sweden. Sweden's Slowson Bridge is located in the Slowson District of Stockholm, Sweden.

Correctly specifying materials in chemical process industries

Stainless Steel World Publisher -
The rapid failure of several 316 stainless steel pipes in a heat exchanger raised questions as to whether a manufacturing fault or service conditions were to blame. This second in a series of three case studies conducted by Dr. Elayaperumal examines the corrosion of stainless steel tubes in chloride solution and why duplex would have been the best material of choice.

Danieli Automation revamp for Columbus Stainless

Stainless Steel World Publisher -
Acerinox, a global stainless steel manufacturing group, contracted Danieli Automation for the electrical and automation revamp of the stainless steel slab caster at Columbus Stainless (Pty) Ltd., Mpumalanga, South Africa.

Sandvik opens coiled tubing line in China

Stainless Steel World Publisher -
In July 2019, Sandvik will open a state-of-the-art coiled tubing line for premium grades of seamless stainless-steel products in smaller dimensions at its Zhenjiang tube mill near Shanghai, China.

Duplex forgings & tubes in chemical process industries: cautions to be...

Stainless Steel World Publisher -
While duplex stainless steels are the ideal material of choice for process equipment in the chemical process industries, care must be taken during specification, fabrication and storage. The next three issues of Stainless Steel World will present case studies conducted by Dr. Elayaperumal which illustrate the importance of these steps to be able to take advantage of the properties of duplexes in service.

Kloeckner UK increases its water jet cutting capacity

Stainless Steel World Publisher -
Kloeckner Metals UK announces that it has commissioned a second Water Jet machine to accommodate growing customer demand.

First vessel of Stainless steel delivered on June

Stainless Steel World Publisher -
The first vessel in this series of four Stainless steel tankers was delivered on June 27. The latest member of the Utkilen A/S fleet is now delivered and left the shipyard on 28th of June.

Sandvik to open coiled tubing line in China

Stainless Steel World Publisher -
In July 2019, Sandvik will open a state-of-the-art coiled tubing line for premium grades of seamless stainless-steel products in smaller dimensions at its Zhenjiang tube mill near Shanghai, China.

SPI funds invest in the capital of Vallourec Umbilicals

Stainless Steel World Publisher -
The "Sociétés de Projets Industriels" funds (“SPI fundsâ€?), managed by Bpifrance and subscribed jointly by the French Government and the European Investment Bank under the "Juncker Plan", have invested in the capital of Vallourec Umbilicals, specialized in the manufacture of tubes for umbilicals, to support and finance its phase of industrialization on a larger scale.
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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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