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Difference between Duplex and Super Duplex Fasteners

There are many different types of stainless steel fasteners, all of which have the same property: corrosion resistance. This property, along with the low level of maintenance required when working with this type of metal, is just one of the reasons it is so popular in so many applications.

Although both duplex and super duplex are chromium, molybdenum, and nickel alloys. They also have a mixed austenite and ferrite structure, which gives them better mechanical and physical properties than individual austenitic and ferritic stainless steel classes.

The distinction between duplex and super duplex fasteners.

The Price Distinction Between Duplex And Super Duplex

Because super duplex materials contain more chromium, nickel, and molybdenum, they are more expensive than standard duplex grades. Standard duplex and super duplex materials come in a variety of grades. Each type has a different material composition. Prices vary depending on the material composition. Super duplex is generally more expensive than standard duplex grades.

Duplex and Super Duplex Stainless Steel Welding

One of the most serious problems in welding metallic components is chromium carbide precipitation, which can lead to intergranular and localized corrosion in the long run. Because both duplex and super duplex materials contain a high chromium content, they are susceptible to chromium carbide precipitation.

However, the amount of carbon in these materials also influences carbide precipitation. Both materials must be preheated before welding, and post-weld heat treatment must be performed. Because both of these materials are less prone to corrosion, they are both suitable for welding if the proper procedures and parameters are followed.

Corrosion Resistance of Duplex and Super Duplex

One of the most important properties of duplex and super duplex stainless steels is their corrosion resistance. These are used as a replacement for more traditional steels. Both grades have higher corrosion resistance than most austenitic stainless steels, but the super duplex has even higher corrosion resistance.

Because it is resistant to most general corrosive components, mild acids, and oxidizing agents, a super duplex can be used in chemical, marine, seawater, and food-grade applications. The corrosion resistance properties of a super duplex vary depending on the grade.


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