All You Need to Know About Duplex Stainless Steel Pipe

All You Need to Know About Duplex Stainless Steel Pipe

Are you curious about Duplex stainless steel pipe and all the advantages it can provide? Do you want to know why many manufacturers increasingly use this versatile material in critical piping applications? Well, you’ve come to the right place! In this blog post, we will explore what duplex stainless steel pipe is, break down its chemical composition and fabrication process, analyze its various benefits as a viable option for specific industrial applications, and much more. So if you’re looking for detailed information on how duplex piping could work best in your project specifications – keep reading!

Properties of Duplex Stainless Steel Pipe

Duplex stainless steel pipes are becoming increasingly popular because of their superior strength and corrosion resistance compared to traditional carbon steel. Duplex stainless pipes demonstrate good tensile strength, flexibility, high fracture toughness, and low thermal expansion. They can tolerate temperatures higher than austenitic types while maintaining similarly high corrosion resistance. Additionally, they can provide greater mechanical properties due to a combination of ferrite and austenitic microstructure when properly heat treated. This combination makes duplex stainless pipes highly resistant to chloride pitting and stress-corrosion cracking in environments with chlorides. Finally, thanks to their increased chromium content (22% minimum), these alloys are better able to resist localized corrosion such as pitting or crevice attack without requiring specialized fabrication techniques like welding cladding or alloying welding fillers, which are common on more conventional alloys.

Applications of Duplex Stainless Steel Pipe

Duplex stainless steel pipe has many applications, such as heat exchangers, pumps and valves, and piping systems for petrochemical plants, oil refineries, and other industrial processes. The pipes are extremely strong compared to standard austenitic grades of stainless steel due to their high strength-to-weight ratio. Duplex pipes resist localized corrosion from chlorides but may be vulnerable to stress corrosion cracking (SCC) under certain conditions. Furthermore, they are often used in cryogenic applications since they maintain their mechanical properties at ultra-low temperatures and have good weldability characteristics. In addition, duplex pipes are ideal for water lines since they resist biofouling which can be a problem with traditional fully austenitic grades of stainless steel.

Advantages of Duplex Stainless Steel Pipe

Duplex stainless steel pipe offers numerous advantages compared to other metal pipes. They possess excellent mechanical properties with high strength, good corrosion resistance, and superior toughness. Duplex steels have attractive surface finishes and better weldability than conventional austenitic steels. Furthermore, these pipes are cost-effective due to their ease of manufacture and long-lasting performance in many corrosive environments. Additionally, duplex stainless steel has close to equal amounts of ferrite and austenite, so there is a balanced combination of physical properties and increased mechanical strength over other types of steel grades. Finally, the low thermal expansion coefficient improves thermal insulation for applications in sensitive industries such as aerospace engineering or nuclear power plants.


In conclusion, duplex stainless steel pipes are an excellent choice for various applications that require high-strength, corrosion-resistant, and durable materials. They possess an excellent combination of mechanical properties that make them ideal for use in chemical processing plants, oil and gas refineries, desalination plants, marine vessels, and offshore drilling rigs. Despite their high cost and manufacturing limitations, duplex stainless steel pipes offer significant long-term cost savings due to their long service life and corrosion resistance properties. If you’re searching for a reliable and durable pipe material that can withstand harsh chemical and severe environmental conditions, duplex stainless steel pipes are perfect.