Alloy 255 is a generic description of our unique Ferralium® 255 super duplex stainless steel (DIN 1.4507, UNS S32550, ASTM F61).
History and properties
It was patented in 1968 and has since been used in a wide variety of demanding applications, including oil and gas, chemical processing and subsea. We carry extensive stock across our warehouses in the UK and USA as bar, plate, pipe and fittings.
In bar form, it is the only super duplex stainless steel to achieve a yield strength greater than 85ksi. Its increased copper content, compared with other super duplex stainless steels, gives it superior performance in a range of acids such as sulphuric acid, making it well suited to fertiliser production.
Ferralium® 255 was used in the 1980s refurbishment of the Statue of Liberty. More than 9T of super duplex stainless steel replaced parts of the internal supporting structure that had suffered from corrosion.