Allegheny technologies incorporated [ati] is one of the world`s largest and most diversified producers of specialty metals. Ati produces a wide variety of stainless steel alloys known for their excellent corrosion and heat resistance. Being a part of that duplex stainless steels have a structure that contains both ferrite and austenite. Duplex alloys have high strength and improved stress corrosion cracking resistance than most austenitic alloys and greater toughness than ferrite alloys, especially at low temperatures. The corrosion resistance of duplex alloys depends mainly on their composition, particularly the amount of chromium, molybdenum, and nitrogen they contain. Duplex alloys are often divided into three sub-classes:
Lean duplex [al 2003™ alloy] - piping, tubing in general corrosion and chloride environments, architectural structures, roofing, topside applications on oil platforms
Standard duplex [al 2205™ alloy]- pipe, tubing in general corrosion and chloride stress corrosion environments
Superduplex [al 255™ alloy and uns s32760] - pipe, containers for cpi, oil & gas
