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Duplex Stainless Steel, also known as Ferrite-Austenitic Stainless Steel, is a family of stainless steel that have two-phase microstructure containing Ferrite and Austenite, which the austenitic grains embedded in a ferritic phase if the metallographic phase is observed. It is important that the mix of ferritic and austenitic phase is roughly 50/50, a too high content of any structure can lead to reduced corrosion resistance and mechanical properties.
Duplex stainless steel offers many attractive properties
Strength: Dual phase prevents grain growth during annealing and a much higher strength can be achieved after strain hardening compared to ordinary austenitic stainless steel. 
Ductility: Duplex stainless steels are unique in its kind of combining super high strength with excellent ductility and elongation. 
Fatigue resistance: Duplex microstructure together with low inclusion content, excellent strength and ductility results in superior fatigue resistance.

Duplex Stainless Steel S32750 2nd Effect Evaporator


Duplex Stainless Steel Vessel S32750 Separator

Thermal expansion: Duplex stainless has lower expansion in elevated temperature than an austenitic stainless steel. The coefficient of thermal expansion is approximately 25% lower because of the ferrite phase in Duplex stainless steel.
Nickel price stability: Duplex stainless steels have generally lower nickel and molybdenum contents than their austenitic counterparts of similar corrosion resistance. Due to the lower alloying content, Duplex stainless steels can offer lower alloy surcharge and better price stability over time.

Duplex Stainless Steel offers very good resistance to general and pitting corrosion due to the high content of chromium, nitrogen and molybdenum. The Duplex microstructure itself gives high resistance to stress corrosion cracking. Moreover, economical efficiency of Duplex Stainless Steel can be a good choice for material selection in application of process equipment. 

Duplex Stainless Steel Process Equipment Fabrication

Suntech Metal Equipment has abundant experience in designing, fabricating and building the following types of duplex stainless steel process equipment and parts:
 Duplex Stainless Steel Heat Exchanger
Duplex Stainless Steel Reactor
​​​​​​​ Duplex Stainless Steel Column
​​​​​​​ Duplex Stainless Steel Separator
​​​​​​​ Duplex Stainless Steel Tank
​​​​​​​ Duplex Stainless Steel Pipe

More Questions?

If you need more information for Duplex Stainless Steel applications or fabrications of Duplex Stainless Steel process equipment, please contact us at Technical Solutions, Suntech Metal Equipment will provide satisfactory solutions.

Rectangular Super Stainless Steel N08926 Marine Scrubber



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