Duplex Steel: Uses, Composition, Properties | Xometry
Duplex steel, or duplex stainless steel, is a type of stainless steel that has a two-phase microstructure consisting of approximately equal amounts (~50%) of austenite and ferrite phases, although in commercial alloys the ratio may be 40/60. This combination of phases gives duplex steel its name "duplex," meaning "two-fold" or "double."