Alloys made of duplex stainless steel are extremely corrosion resistant and work hardenable. There is a mixture of austenite and ferrite phases in their microstructures. The result is that stainless steels made from duplex alloys have properties characteristic of both austenitic and ferritic materials.
Corrosion Resistance of Duplex stainless steel Duplex stainless steel are extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulphide environments, Duplex stainless steel exhibit very high resistance to stress corrosion cracking.
A combination of properties like these can lead to some compromises when compared with grades that are pure austenitic or pure ferritic. Stainless steels made from duplex types tend to be tougher than those made from ferritic types. It is possible for duplex stainless steels to possess a strength twice that of austenitic stainless steels in some cases.