Duplex Stainless Steel (DSS, short for Duplex Stainless Steel), refers to the ferrite and austenite each account for about 50%, the content of general is a youthful appearance also need to achieve at least 30% of the Stainless Steel. It is alloyed with 18%-28% Cr and 3%-10% Ni in the condition of low C, Some steels also contain the alloy elements such as Mo, Cu, Nb, Ti and N, etc.

This kind of steel has the characteristics of austenite and ferritic stainless steel. Comparing with ferritic stainless, duplex stainless steel has higher plasticity, ductility and better intergranular corrosion resistance and weldability. It keeps same 475℃ brittleness with ferritic stainless and high thermal conductivity. Duplex has improved yield strength, resistance to intergranular corrosion, stress corrosion, corrosion fatigue and abrasion & corrosion compared with austenitic stainless steel. It is also a Nickel saving stainless steel

When the pitting resistance of duplex stainless steel is higher than 40% (PREN=[Cr]+3.3[Mo]+16[N]), it can be called super duplex stainless steell.

Duplex stainless steel (DSS) is featured with structure of two phases (α and γ) and has characteristics of both ferritic and austenitic stainless steel. It has good corrosion resistance and high strength. It is alloyed with 18%-28% Cr and 3%-10% Ni in the condition of low C. Some steels also contain the alloy elements such as Mo, Cu, Nb, Ti and N, etc.

Comparing with ferritic stainless, duplex stainless steel has higher plasticity, ductility and better intergranular corrosion resistance and weldability. It keeps same 475℃ brittleness with ferritic stainless and high thermal conductivity. Duplex has improved yield strength, resistance to intergranular corrosion, stress corrosion, corrosion fatigue and abrasion & corrosion compared with austenitic stainless steel.