UNS S31803 Duplex Steel Stainless Steel Coils

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UNS S31803 Duplex Steel Stainless Steel Coils

S31803 is the Unified Numbering System (UNS) designation for the original duplex stainless steel. The UNS system was created by various trade groups in the 1970s to reduce confusion caused by the same alloy being called different things, and vice versa. Each metal is represented by a letter followed by five numbers, where the letter indicates the metal series, i.e. S stands for stainless steel.

Used in paper mill applications where lower alloy grades do not offer sufficient corrosion resistance. Based on a 22% chromium content, they have a combined austenitic:ferritic microstructure that provides increased strength, corrosion resistance and cost-effectiveness.

The UNS S31803 (ASTM F51) specification has been largely superseded by UNS S32205 (1.4462, ASTM F60). This reflects their desire to maximize the alloy's corrosion properties, aided by the development of the AOD steelmaking process, which allows for tighter control of composition. Additionally, it allows the added level of nitrogen to be influenced rather than just present as a background element. Therefore, the highest performing duplex steel grades seek to maximize the content of chromium (Cr), molybdenum (Mo) and nitrogen (N).

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