These valve cages, machined from solid Ferralium® 255 super duplex stainless steel (UNS S32550, Alloy 255, DIN 1.4507, ASTM F61) bar, show the alloy's machinability. They achieve a superlative finish without specialised treatment, even where close dimensional tolerances are demanded.
Ferralium® 255 combines the mechanical, chemical and physical properties expected of a modern super stainless steel, and here it has undergone almost every kind of machine-shop production operation.
