Material to UNS S31803 (and the other specifications listed below) is described as a duplex stainless steel with a microstructure of 50:50 austenite and ferrite. The steel combines good mechanical strength (typically up to over 480 MPa yield strength) and ductility with moderate to good corrosion resistance in a variety of environments. By agreement, the alloy can be supplied with a PREn (Pitting Resistance Equivalent) at >34 which ensures that the resistance to pitting corrosion is as high as possible for this alloy grade. In addition, the steel offers good resistance to stress corrosion cracking. Ambient and subzero temperature notch ductility is good. These attributes mean that this duplex steel can be used successfully as an alternative to 300 series stainless steels in applications where higher mechanical strength / lower weight is required and / or resistance to stress corrosion cracking is needed.
Material to UNS S31803 (and the other specifications listed below) is described as a duplex stainless steel with a microstructure of 50:50 austenite and ferrite. The steel combines good mechanical strength (typically up to over 480 MPa yield strength) and ductility with moderate to good corrosion resistance in a variety of environments. By agreement, the alloy can be supplied with a PREn (Pitting Resistance Equivalent) at >34 which ensures that the resistance to pitting corrosion is as high as possible for this alloy grade. In addition, the steel offers good resistance to stress corrosion cracking. Ambient and subzero temperature notch ductility is good. These attributes mean that this duplex steel can be used successfully as an alternative to 300 series stainless steels in applications where higher mechanical strength / lower weight is required and / or resistance to stress corrosion cracking is needed.