Duplex Stainless Steel Bars

Duplex steels originated in Sweden more than 70 years ago. It was primarily used in the sulfite paper industry. Duplex alloys are basically a compromise that has some of the ferritic stress corrosion cracking resistance along with much of the excellent formability of the common austenitic stainless alloys, all this comes at a lesser price as compared to the high nickel alloys. Duplex alloys were made for combating corrosion related problems due to chloride-bearing cooling waters along with other aggressive chemical process fluids. Duplex Steel are called so because of its mixed microstructure. Duplex steels have equal proportions of ferrite and austenite.The chemical composition of duplex steel with high contents of Cr and Mo, results in improved intergranular and pitting corrosion resistance. Duplex steel can be broadly divided into four major groups:

Lean Duplex like 2304, containing no deliberatey added Molybdenum
2205, this is the work-horse grade, forming more than 80% of duplex usage
25 Cr Duplex like Alloy 255 and DP-3
Super Duplex

Applications of Duplex Steel

Heat exchangers, tubes and pipes for the production as well as handling of oil and gas
Heat exchangers and pipes for use in in desalination plants
Pressure vessels, tanks, pipes and heat exchangers for processing as well as transporting of numerous chemicals
Cargo tanks, piping along with welding consumables for use in chemical tankers.