DUPLEX STEEL PIPES – All you need to know

Duplex Steel Pipes have become increasingly popular in recent years. With their impressive durability, strength, and resistance to corrosion, they are an excellent choice for various applications within the oil and gas, chemical, and petrochemical industries. If you are considering using duplex steel pipes for your project, you should know some key things. In this blog post, we will cover everything that you need to know about duplex steel pipes.

What is Duplex Steel?

Duplex steel is an alloy of ferrous metal with around 50% iron content. It is also known as austenitic-ferritic stainless steel and has high strength, corrosion resistance, good weldability and excellent formability. In addition to these features, duplex steel is tough even at cryogenic temperatures. It can maintain its mechanical properties in acid and alkaline environments at temperatures up to 700°C. This makes it an ideal material for industrial applications such as heat exchangers, tanks and pipes in the chemical processing industry.

Why Use Duplex Steel Pipes?

Duplex steel pipes offer numerous advantages over other types of pipes. They have a high strength-to-weight ratio, making them ideal for offshore applications where weight is a concern. They are also corrosion-resistant, making them an excellent choice in corrosive environments, such as chemical plants and oil refineries. Duplex steel pipes offer a variety of advantages over other materials, making them a popular choice for many industries. Their superior corrosion resistance allows them to perform well in salty, acidic, and caustic environments where other metals fail. They are also highly resistant to cracking and pitting while retaining high strength levels even at cryogenic temperatures.

Furthermore, they possess excellent mechanical properties with high flexibility and toughness that help reduce fatigue in dynamically loaded components like shafts or housings. Their good weldability further enhances the material’s fabrication properties. All these benefits make it an ideal choice for many applications, such as oil & gas pipelines, water treatment systems, process piping networks etc.

In addition, duplex steel pipes have excellent fatigue resistance, meaning they can withstand repeated stress without cracking or breaking. This, coupled with their corrosion resistance, makes them an ideal choice for high-pressure applications.

Types of Duplex Steel

There are several different types of duplex steel, each with unique properties and characteristics. The most common types of duplex steel used in pipes and other equipment include SAF 2205, SAF 2507, and Zeron 100.

SAF 2205 is the most popular type of duplex steel, known for its excellent corrosion resistance and high strength. SAF 2507, also known as super duplex steel, has even higher strength and corrosion resistance levels than SAF 2205, making it ideal for use in harsh environments. Zeron 100 is a highly corrosion-resistant type of duplex steel often used in the chemical and petrochemical industries.

Applications of Duplex Steel Pipes

Duplex steel pipes are used in various applications across various industries. They are commonly used in oil and gas extraction and chemical, petrochemical, and food processing industries. They are also used in marine applications, such as offshore drilling platforms and ships. Duplex steel pipes are known for their excellent durability and corrosion resistance, making them suitable for various applications. Common uses include plumbing components, offshore oil rigs, chemical production equipment, heat exchangers and condensers for petrochemical plants, and power generation turbines. They also possess superior strength characteristics due to their lower carbon content compared with other steels, enabling thinner walls in these applications. Their increased weldability provides greater design freedom to engineers while ensuring long-term structural integrity.

In addition, duplex steel pipes produce heat exchangers, which transfer heat between fluids in various industrial applications. They can also produce pressure vessels, pumps, and valves.


Duplex Steel Pipes are an excellent choice for a wide range of applications due to their high strength, durability, and resistance to corrosion. This durable type of steel that combines austenitic and ferritic properties offers an excellent solution for tubing and piping. Knowing what duplex steel is, its benefits, the different types available, and the various applications it can be used in will enable you to make informed decisions when you decide to use it in your project. Be sure to hire experts who can help you select the right type of duplex steel for your project and give you expert advice on maintaining it for longevity.