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Duplex Stainless Steel – Uses and Properties

Duplex Stainless Steel

Duplex stainless steel is a material that combines the properties of ferritic and austenitic steel. As such, it offers features of both materials, providing the best of both worlds. Due to its dual nature, duplex stainless steel has become an increasingly popular choice in a wide range of industries, from automotive to construction. Let’s take a closer look at what makes this material so attractive.

Duplex Stainless Steel Uses

Duplex stainless steel can be used in a variety of applications, including construction and manufacturing. Its combination of strength and corrosion resistance makes it ideal for use in extreme environments, like oil refineries or chemical plants. Additionally, due to its excellent formability, it can be used to create complex shapes and parts with a high degree of accuracy. And because it requires less maintenance than other materials, it helps reduce costs over time.

  • Duplex stainless steel is a type of stainless steel that contains both austenitic and ferritic phases.
  • The composition of duplex stainless steel makes it more resistant to stress corrosion cracking than other types of stainless steel.
  • Duplex stainless steel is also more resistant to pitting and crevice corrosion than other types of stainless steel.
  • Duplex stainless steel is often used in the food and beverage industry due to its resistance to corrosion.
  • Duplex stainless steel is also used in the oil and gas industry, as well as in chemical processing plants.

Duplex Stainless Steel Properties

Duplex stainless steel is corrosion-resistant due to its high chromium content and low carbon content compared to other common types of stainless steel. This combination also makes it highly resistant to stress corrosion cracking (SCC). It is also very strong and ductile due to the ferritic component, making it more suitable for applications that require strength rather than just corrosion resistance. In addition to being strong and corrosion-resistant, duplex stainless steel has good weldability properties as well as excellent cryogenic toughness characteristics at low temperatures.

Corrosion Resistance

One of the most important properties of duplex stainless steel is its corrosion resistance. The austenitic phase of the alloy provides excellent resistance to a variety of corrosive environments, including those containing chlorides or other aggressive chemicals. Additionally, the chromium content of the alloy gives it superior resistance to pitting and crevice corrosion.

Strength and Toughness

Another key property of duplex stainless steel is its strength and toughness. The ferritic phase of the alloy provides high strength and hardness, while the austenitic phase provides ductility and toughness. This combination of properties makes duplex stainless steel ideal for use in structural applications where high strength and toughness are required.


Duplex stainless steel also has excellent weldability due to its balanced microstructure. The austenitic-ferritic structure of the alloy allows it to be welded without the need for pre- or post-weld heat treatment, which can save time and money during fabrication. Additionally, duplex stainless steel can be welded using a variety of welding methods, including gas tungsten arc welding (GTAW), plasma arc welding (PAW), and shielded metal arc welding (SMAW).


Duplex stainless steel is also cost-effective due to its lower nickel content relative to other stainless steels. This lower nickel content helps to reduce the overall cost of the alloy while still providing excellent corrosion resistance and strength.


When looking for superior strength and superior corrosion resistance without sacrificing performance or cost-effectiveness, consider using duplex stainless steel for your project or application. With its excellent formability capabilities, weldability properties, SCC resistance and cryogenic toughness characteristics, duplex stainless steel is truly one of the most versatile materials available today—and a great choice for anyone who needs an all-in-one solution for their project needs!

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