Materials for plant in the chemical, petrochemical, marine and related industries are chosen largely on their ability to give an acceptable life under specific corrosive conditions. Ferralium® 255 (UNS S32550, Alloy 255, DIN 1.4507, ASTM F61) is frequently specified for this reason, offering outstanding resistance to the corrosion and erosion found in processes such as the manufacture of sulphuric acid, phosphoric acid and urea, and in seawater systems.
Ferralium® 255 super duplex stainless steel has much improved corrosion and wear resistance and strength compared with standard austenitic stainless steels, and in many cases has replaced more costly materials such as 'alloy 20' and HASTELLOY alloys.
Fabrications in Ferralium® 255 are often undertaken by Titanium Fabricators Ltd of Sheffield, who have considerable experience with the material. The photograph shows one of four tanks they recently fabricated from Ferralium® 255 plate. TIG welding was used throughout, with Ferralium® 255 bare wire supplied by Langley Alloys, and both forming and welding presented no difficulties.
Plant made from Ferralium® 255 also often uses considerable quantities of matching Ferralium® 255 fasteners, which are readily available from a number of fastener manufacturers.
