UNS S31803 Duplex Stainless Steel: Properties, Equivalents & Supply 

What is UNS S31803 Duplex Stainless Steel? 

UNS S31803 duplex stainless steel is a specialized alloy designed to deliver both high strength and superior corrosion resistance. It is characterized by a dual-phase microstructure, meaning it contains nearly equal parts of austenite and ferrite. This unique combination provides the mechanical strength of ferritic stainless steel along with the corrosion resistance typically found in austenitic grades. As a result, S31803 is well-suited for applications in harsh environments, such as those exposed to chlorides, where standard stainless steels may not perform reliably. Its balanced properties help reduce maintenance costs and extend the service life of components, making it a preferred material in demanding industries. 

Introduction to UNS S31803 Duplex Stainless Steel 

UNS S31803, commonly known by the trade name Duplex 2205, is a premier duplex stainless steel engineered for demanding industrial applications. This S31803 material features a dual-phase microstructure, combining ferritic and austenitic phases in roughly equal proportions. The result is a powerful alloy that delivers the high strength characteristic of ferritic steels and the exceptional corrosion resistance of austenitic steels. Its balanced properties make it a superior and cost-effective alternative to standard grades like 316L and 317L, particularly in environments rich in chlorides.For industries requiring reliable performance in marine, chemical processing, and oil and gas applications, UNS S31803 duplex stainless steel provides an optimal solution. At Nifty Alloys LLC, we are a leading UAE-based supplier and stockist of high-quality duplex steel products. We provide ASTM A790 UNS S31803 pipes, plates, and round bars, complete with global shipping and comprehensive Mill Test Certificates (MTC) to ensure full compliance and traceability for your projects.