Is 2205 a super duplex stainless steel?
The grade UNS S32205 (1.4462, F51) is the most commonly specified duplex stainless steel. Stainless steels using 22% chromium were developed in the 1930’s for severe service applications in paper mills. The original specification was described under the UNS S31803 caption. However, the content of chromium and molybdenum, which define resistance to pitting corrosion, were set at the higher end of the specification to form UNS S32205. Super duplex stainless steels were developed from the 1960’s onwards, based around 25% chromium content. This gives them additional corrosion resistance and strength. Therefore, strictly speaking 2205 super duplex is an inaccurate description of the 2205 duplex stainless steel.
Langley Alloys carries an extensive stock of duplex stainless steel, up to 16″ (406.4mm) diameter solid bars, plate up to 3″ (76.2mm) thickness plus selected hollow bars, seamless tubes and fittings.
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