DIN 1.4462 is a duplex stainless steel based upon a 22% chromium content. It can also be referred to as UNS S31803 (ASTM A182 F51) or UNS S32205 (ASTM A182 F60) when supplied as solid bar.
The grade known as DIN 1.4462 was originally developed in the 1930s for application in paper and pulp manufacture. It provided twice the strength and a significant uplift in corrosion resistance compared to the more general 304/316 stainless steel grades.
Sometime later, a number of leading manufacturers of duplex stainless steel were consistently producing this grade to the upper end of the allowable specification. This reflected their desire to maximise the corrosion performance of the alloy, aided by the development of the AOD steelmaking process which allowed tighter control of composition. In addition, it also allowed the level of nitrogen additions to be influenced, rather than just present as a background element. Controlling nitrogen, chromium and molybdenum content to the upper end of the allowable specification for S31803 results in better and more consistent corrosion resistance.
To differentiate the duplex stainless steel produced at the top end of the composition range, a further specification was introduced, namely UNS S32205, although this still meets the DIN 1.4462 caption. Duplex stainless steel made to the S32205 (F60) caption will fully meet the S31803 (F51) caption, whereas the reverse is not true. Therefore, S32205 can be dual-certified as S31803.
Langley Alloys stocks S32205 (2205) duplex stainless steels as round bars from 5/8”-20” diameter (15.87-508mm), plate up to 3” (76.2mm) thickness, as well as pipes in scheduled sizes, flanges and fittings.
For more information about our range of alloys, please contact Langley Alloys today.