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Duplex & super duplex
Product properties

Duplex grades have a ferritic-austenitic microstructure, with a phase balance of about 50%

ferrite and 50% austenite. Duplex grades combine many of the beneficial properties of

ferritic and austenitic stainless steels. The duplex microstructure contributes to the high

strength and high resistance to stress corrosion cracking.Other characteristic properties of

duplex grades include good abrasion and erosion resistance, good fatigue resistance, high

energy absorption and low thermal expansion.


Weldability
Duplex stainless steels generally have good weldability and can be welded using most of the

welding methods used for austenitic stainless steels:

Shielded metal arc welding (SMAW)
Gas tungsten arc welding TIG (GTAW)
Gas metal arc welding MIG (GMAW)
Flux-cored arc welding (FCW)
Plasma arc welding (PAW)
Submerged arc welding (SAW)
Laser welding
Resistance welding
High-frequence welding


Corrosion resistance

Duplex stainless steel grades are superior to standard austenitics with regard to stress

corrosion cracking resistance, and duplex grades are also good in a number of acidic

and alkaline environments.




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