Duplex Stainless Steels have a microstructure that contains both ferrite and austenite. When Duplex Stainless Steel is melted, it solidifies from the liquid phase to a completely ferritic structure. As the material cools, approximately half of it changes to an austenitic structure. The result is an alloy with a microstructure of roughly 50% austenite and 50% ferrite. Duplex alloys have higher strength and better stress corrosion cracking resistance than most austenitic alloys and greater toughness than ferritic alloys, especially at low temperatures.
Duplex 2205 Stainless Steel Tubeside and 304
Titanium Grade 2 Tubeside with Duplex 2205
Duplex 2205 Stainless Steel Tubeside and Shellside
Zirconium 702 Tubeside with 2507 Duplex Stainless Steel Shellside –
AL6XN Tubeside with 2205 Duplex Stainless
The lower nickel and molybdenum content of the Duplex Stainless Steels as compared to the austenitic grades with similar corrosion resistance, gives the Duplex grades a lower cost per pound. The Duplex grades are also about twice as strong, resulting in material savings because of wall thickness requirements. This means less metal at a lower cost per pound.
When considering Duplex Stainless Steel for Heat Exchangers, often there is even more benefit. The lower nickel content of the Duplex grades means a better thermal conductivity as compared to the austenitic equivalent grade. Less heat transfer surface area is required to perform the same duty. Welding the Duplex Stainless Steels seems easy if the only criteria is passing ASME code, but consideration of the all-important weld mixture and correct handling are needed to insure successful corrosion resistance.
Duplex Stainless Steel may be a good material selection for your project. We invite you to call TM to discuss your application and we can quickly see if you should consider Duplex. When it comes to the fabrication of Duplex and Super Duplex Stainless Steel, TM has the experience and knowledge to make sure it is engineered, built and inspected to the highest standards.
You’ll find more information about applications of Duplex Stainless Steel and common grades in this Page.
Engineers and Fabricates the following applications of Duplex Stainless Steel and custom process equipment:
Duplex Stainless Steel serves many different applications in these industry categories:
Duplex Stainless Steel is very well suited to many industrial processes. The following are some of the environments in which Duplex is fully resistant*.
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