S31803 duplex stainless steel bar (UNS S31803 / EN 1.4462) is a 22% chromium duplex grade with a mixed austenitic/ferritic structure. It is commonly specified where higher strength is required alongside good corrosion performance, particularly in chloride environments where stress corrosion cracking can be a concern. OverviewDuplex grades such as S31803 are often used as an alternative to 300 series austenitic stainless steels when higher mechanical strength and lower section weight are preferred. In many applications, S31803 duplex bar provides significantly higher strength than standard austenitic stainless steels, while maintaining good general corrosion resistance and good resistance to chloride stress corrosion cracking. Key benefits High strength compared to standard austenitic stainless steels Good general corrosion resistance in many industrial environments Improved resistance to stress corrosion cracking in chloride conditions Suitable for many marine, chemical and process applications Corrosion and service performanceS31803 duplex stainless steel is designed to perform well in environments where chloride exposure can accelerate corrosion mechanisms such as pitting and stress corrosion cracking. It is also used in applications where sulphide stress corrosion cracking resistance is required in certain service conditions. Selecting the right grade depends on operating temperature, chloride levels, and the specific process environment. Welding and fabrication notesS31803 is generally weldable using many standard electric arc welding processes when appropriate procedures and consumables are used. As with all duplex stainless steels, control of heat input and correct welding procedure selection is important to maintain the intended microstructure and performance. Oxy-acetylene welding is typically not recommended. Typical applicationsS31803 duplex bar is commonly used for pumps, valves, flanges and shafts, as well as components across oil and gas, chemical, power and brewing industries where strength and corrosion resistance are required. Supply noteBelow is our standard size range for S31803 duplex stainless steel bar. If you do not see the size or quantity you need, please contact our team, and we will help with availability, lead times and a quote.