Duplex Steel Pipe – Properties, Characteristics, and Applications

Duplex Steel Pipe - Properties, Characteristics, and Applications

Duplex steel pipe has become a go-to choice for its proven strength and durability for dozens of industries. Boasting superior corrosion resistance properties than other stainless steels, as well as higher mechanical strength and toughness, these pipes are suitable for many applications – from construction and architecture to chemical processing. So why choose duplex steel? In this blog post, we’ll explore the unique properties of duplex steel – its structure and composition, characteristics, and strengths – and examine common applications in which it is used. Read on to learn more about all things related to durable Duplex Steel Pipe.

Properties and Characteristics

Duplex steel pipe is a type of stainless steel pipe with austenitic and ferritic microstructures in its chemical composition. It offers superior strength, corrosion resistance, high flexibility and increased toughness compared to stainless steel. Its combination of properties makes it suitable for applications where high strength and good corrosion resistance are essential. The most common duplex steels are 2205 (25% chromium – 5% nickel) and 2507 (25%% % chromium – 7% nickel). Compared to other types of stainless steel pipes, duplex pipes have better tensile & yield strength as well as higher creep & stress-rupture values at elevated temperatures. Additionally, when exposed to cyclic loads over long service times, these pipes have superior fatigue characteristics, making them suitable for use in pipelines transporting oil & gas or similarly hazardous substances.

The duplex steel’s microstructure also provides good weldability and formability, making it easy to work with during fabrication. Duplex steel pipe can be machined, welded, and formed like any other type of steel pipe, making it versatile for different applications.

Applications of Duplex Steel Pipe

Duplex steel pipes are used in many different applications due to their strong combination of mechanical and corrosion properties. They can be found in seamless and welded tube forms with various grades, sizes, and temperature ratings. Duplex steel pipes have high strength, excellent fatigue resistance, good abrasion and erosion resistance, exceptional formability and weldability, and superior impact toughness compared to other ferritic alloys. Moreover, they offer lowered life cycle costs when compared with traditional materials such as carbon steel or stainless steel. Common applications for duplex steel pipe include:

  • Oil & gas transfer pipelines.
  • Petrochemical plants.
  • Desalination systems.
  • Seawater cooling equipment.
  • Offshore platforms.
  • Marine vessels & ships’ hulls.
  • Sewage treatment facilities.
  • Pressure vessels & tanks for chemical processing plants.

In addition, duplex steel pipe is used in heat exchangers and pressure vessels for its high strength and corrosion resistance properties. It is also used in the construction of bridges and other infrastructure projects, where its high strength and durability make it an ideal material for use in harsh environments.

Maintenance and Care

Duplex steel pipes need regular inspection and maintenance to ensure their continued reliability. To ensure the duplex steel pipe is working correctly, inspect it for corrosion or rust before installing it. Also, regularly check welded joints for any structural damage or weakening. Additionally, use proper cleaning solutions to remove debris and residue from the pipe’s inside part – this will help prevent clogging, which could restrict water flow. In addition, avoid using abrasive materials when cleaning the outside of the pipe, as they can degrade its surface material over time. Lastly, protect your pipes against extreme temperatures by providing insulation around them if needed – this can extend their lifetime significantly!


Duplex steel pipe has become a popular choice in various industries because of its unique combination of properties, characteristics, and applications. Its high strength, excellent corrosion resistance, and good weldability make it versatile for different applications such as oil and gas, marine, and chemical industries. Duplex steel pipes can provide reliable and durable performance for many years with proper maintenance and care. As engineers continue to demand high-performing, low-maintenance materials, the use of duplex steel pipe is likely to increase in the years to come.