ThePipingMart Blog other Know the Difference between a Duplex and Super Duplex

Know the Difference between a Duplex and Super Duplex

Duplex steel is divided into three categories: duplex, super duplex, and lean duplex. Duplex stainless steel is an extremely versatile metal that is used all over the globe. Its name comes from the fact that it is made up of two different metal grades. When Duplex is at room temperature, it is a Fe-Ni-Cr alloy with a two-phase ferritic-austenitic stainless-steel microstructure. Duplex steels have higher chromium content (19–28%) is lower molybdenum content (5%), and lower nickel content than austenitic stainless steels.

The 2205 and 2507 are perhaps the most frequently used duplex stainless steels. 2507 is referred to as “super duplex” due to its higher corrosion resistance. Combining ferritic and austenitic grades has the added benefit of producing a metal with a two-phase metallurgical structure that ultimately benefit from both microstructures’ properties.

Due to its superior combination of strength and corrosion resistance, Super Duplex Stainless Steels is an excellent choice for piping, flanges, and fittings. This is a type of duplex pipe. Duplex is a material that manages to combine the properties of ferritic and austenitic steels. As a result, the ferritic structure provides high strength whereas the austenitic structure provides high corrosion resistance. These come in a variety of grades and classes.

Chromium, nickel, molybdenum, and nitrogen are being used to make the Super Duplex Seamless Pipe. Ever since addition, corrosion resistance and strength have risen, but impact resistance has decreased. The seamless pipes are simple to install and handle, and their dimensions are extremely accurate. Super Duplex Welded Pipes, on the other side, are so much stronger but also have an extremely high roughness and should be fitted with special tools. It’s ideal for use in welding applications.

Regardless of the fact that the material for Duplex and Super Duplex steels is just the same, both standard and super duplex steels have ferritic and austenitic phases in their metallurgic microstructure. They have a combo of ferritic and austenitic properties. Chromium, nickel, and molybdenum are some of the elements present with other elements present in smaller amounts.

Duplex stainless steels have a chromium content of close to 22%, whereas super duplex steels have a chromium content of up to 25%. This higher nickel and molybdenum content gives the super duplex material more corrosion resistance. Another thing that is different between duplex and super duplex steel is nitrogen expansion.

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