Question: is duplex and austenitic stainless steel?
Answer: Duplex stainless steels are called “duplex” because they have a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel. ... The result is a microstructure of roughly 50% austenite and 50% ferrite. Duplex stainless steels have a two-phase microstructure of austenite and ferrite grains.