Super duplex stainless steel differs from duplex in that it is a steel with pitting corrosion resistance. They are a highly alloyed steel often with 25% chromium or more. They have the same high strength and resistance to stress corrosion, fatigue and erosion as duplex as well as offering a great resistance to chloride elements that can cause stress corrosion cracking. Couple this with a high thermal conductivity rate as well as a low coefficient of thermal expansion and super duplex quickly becomes the stainless steel of choice for many.

Just like duplex, it offers low thermal expansion and high energy and heat conductivity, beating other austenitic steels. What really sells their versatility however, is the malleability and weldability of the steel meaning that it can easily be worked to your needs across multiple applications.

This steel is available as a seamless pipe as well as flanges, butt weld fittings, fasteners and pressure fittings. It means that steels like this typically have a wide variety of applications, but also there is a lot of cross over with duplex steels. For instance they are both used in tubing and piping (as a seamless pipe) for gas, oil and desalination plants. Super duplex steel can also be used as mechanical and structural components as well as in FGD systems in the power industry.

Just like duplex, these pipes can handle chlorides. They can be deployed in rotors, shafts, fans, press rolls, cargo tanks, vessels, chemical tankers – again, the chemical resistance coming into play.