Duplex Stainless steels are extremely corrosion resistant, Their microstructures consist of a mixture of austenite and ferrite phases. As a result, duplex stanless steels display properties characteristic of both austenitic and ferritic stainless steels. Duplex stainless steels are in most cases, tougher than ferritic stainless steels. Duplex stainless steels are considered resistant to stress corrosion cracking, Duplex steels are also magnetic.