90 Years Of Development History Of Duplex Stainless Steel

2020 is the 90th anniversary history of duplex stainless steel

Avesta Ironworks in 1930, located in Avesta, Sweden, History Of Duplex Stainless Steel
Avesta Ironworks in 1930, located in Avesta, Sweden

1930s to 1970s

In the early 1900s history of duplex stainless steel, the earliest stainless steels were pure austenite, ferrite or martensite. In 1930, Sweden's Avesta Ironworks developed the first duplex stainless steel with a combination of ferrite and austenite.

In the early days, dual-phase steel was used for castings, bars and plates for pulping, papermaking and high-temperature applications due to its good corrosion resistance and castability. By 1932, duplex steel accounted for 6.5% of the global 5,500-ton global stainless steel market.

In the following decades, metallurgists developed techniques to reduce carbon content and introduce nitrogen to control plasticity and weldability. Improvements in the 1950s included the development of nitrogen-added duplex steel grades to reduce the risk of cracking during casting and welding.

Second-generation duplex stainless steel

The development of duplex steel reached its peak in the 1970s. The second-generation duplex stainless steel has better resistance to intergranular corrosion, and has gained more applications and greater commercial success.

From a metallurgical point of view, these steel grades utilize increased nitrogen to enhance the formation of austenite. This can prevent the duplex structure from reducing to full ferrite in the heat-affected zone after welding or hot working. Nitrogen also helps steel to resist pitting corrosion and at the same time increase strength.

3rd: Super Duplex

The development in the 1970s and 1980s was mainly the third generation of duplex steels: Forta SDX 2507, Forta SDX 100, the more highly alloyed super duplex stainless steels. These grades contain more alloying elements and therefore have better performance, but at a higher cost. Super duplex stainless steel meets the needs of the offshore oil, gas, food and beverage, and chemical industries.

The most common definition of super duplex stainless steel is that its pitting corrosion resistance (PRE or PREN) should reach at least 40. To achieve this level of corrosion resistance, metallurgists use alloying elements such as chromium, molybdenum, tungsten, nickel, and copper. Of course, more alloying elements in super duplex steels also mean higher costs, but compared with austenitic steels, they are usually more competitive in price and can be regarded as a substitute for austenitic steels .

Low Alloy Duplex Steel (Lean Duplex)

At the other end of the duplex steel product line, the Avesta plant developed low-alloy duplex stainless steel (Lean Duplex) in the mid-1980s to minimize raw material costs.

This is especially true when nickel is used as an alloying element. Over the years, the price of nickel has fluctuated sharply. Therefore, by reducing the nickel content, the stainless steel pipe fittings supplier can provide customers with more stable stainless steel products.

Among these Lean Duplex, Forta LDX 2101 is especially popular. It has higher manganese and nitrogen to compensate for its lower nickel content. It has high strength, good corrosion resistance and welding performance.

Formable Duplex

In the past 10-15 years, Duplex steel with improved molding properties has been further developed. The emergence of Formable Duplex Forta FDX 27 solves the problem that other duplex steels cannot have ductility and high strength at the same time, and cannot produce complex and lightweight molded parts.

New service from OilVoice
Trip Shepherd is for companies who need to track their staff in areas of risk.
It's free to use, so we invite you to try it.

Visit source site

duplex stainless steelDevelopment History

More items from cnwellgreen

What Are The Main Factors Affecting The Chemical Heat Treatment Of Duplex 2507

The chemical heat treatment of Duplex 2507 stainless steel   Duplex 2507, one of famous stainless steel matrials used in Petrochemical field. Chemical heat treatment of Duplex 2507 is mainly the formation of active atoms: the active atoms are absorbed by the metal surface and the active at ...

roger chen - kaysuns industry limited

Posted 1 day agoPress > Duplex 2507Petrochemical Industry

JISCO's Duplex Steel of Petroleum Makes Another Great Achievement: Enters The High-end Field

A few days ago, along with the successful downhole operation of corrosion-resistant alloy coiled 2205 stainless steel pipes in the Changqing Oilfield of China National Petroleum Corporation, it marked the entry of JISCO 2205 duplex steel of petroleum into the high-end field. Corrosion is a ...

roger chen - kaysuns industry limited

Posted 12 days agoPress > duplex steelJISCOPetroleum tubing

Tsingtuo Group's Bar and Wire Project Will Be Put Into Operation In September 2021

Tsingtuo Group's Stainless Steel Bar and Wire Project Will Be Put Into Operation In September 2021 Recently, the Fujian Provincial Development and Reform Commission issued the review opinions on the energy-saving review of the stainless steel bar and wire processing project of Fujian Tsingtu ...

roger chen - kaysuns industry limited

Posted 1 month agoPress > Stainless Steel BarTsingtuo GroupTsingshan Group

WEGS' Hubei Water Stainless Steel Pipe Base Plans To Put Into Operation By The End Of 2020

WEGS' Hubei Water Stainless Steel Pipe Base Plans To Put Into Operation By The End Of 2020 The Hubei Xianning production water stainless steel pipe base of WEGS covers an area of 160 acres. The first phase of 93 acres is under construction and is scheduled to be put into operation by the end o ...

roger chen - kaysuns industry limited

Posted 1 month agoPress > Water Stainless Steel PipeStainless Steel Pipe BaseWEGS

TISCO And Tencent Cloud Signed A Cooperation Agreement

TISCO And Tencent Cloud Signed A Cooperation Agreement On September 4 2020, the inauguration of the Shanxi Iron and Steel Industry Intelligent Manufacturing Innovation Center and the signing of a cooperation agreement between TISCO and Tencent Cloud were held at the Garden International Conference ...

roger chen - kaysuns industry limited

Posted 1 month agoPress > Tencent couldTISCO
All posts from cnwellgreen