Austenitic-ferritic stainless steel also referred to as Duplex Stainless Steel, combine many of the beneficial properties of ferritic and austenitic steels. Due to high content of chromium and nitrogen, and often also molybdenum, these steels offer good resistance to localized and uniform corrosion. The duplex microstructure contributes to the high strength and high resistance to stress corrosion cracking.
Duplex Stainless Steels higher thermal conductivity gives them a distinct advantage over the austenitic stainless steel in heat transfer application. The downside is in their difficulty in welding and Quality Control. Heat input, cooling rates and interpass temperatures must be controlled or the corrosion resistance, strength, toughness, ductility and resistance to stress corrosion cracking will be compromised. Exotic Fabtech's expertise in welding reactive metals makes us more qualified to handle the Duplex Stainless Steel alloys compared to fabricators who have a history in only Austenitic Stainless Steel.
We at Exotic Fabtech handles Duplex SS such as S32101, S32304, S32205, S31803, S32750 etc. Duplex steel equipment are mostly used in Pulp and Paper Industries, Desalination Plants, Seawater, Flue-gas cleaning etc.