Duplex & Super Duplex Steel

Duplex and super duplex steel are two types of stainless steel alloys that contain higher levels of chromium and molybdenum compared to standard austenitic stainless steels. These alloys also have a mixed microstructure of both austenitic and ferritic phases, which gives them unique properties. Duplex stainless steel typically contains around 22% chromium and 5% nickel, as well as 3% to 4% molybdenum. This combination of elements provides high resistance to stress corrosion cracking, pitting, and crevice corrosion. Duplex stainless steel is also known for its high strength and toughness, making it a popular material for applications in the oil and gas, chemical, and marine industries. Super duplex stainless steel contains even higher levels of chromium, nickel, and molybdenum, typically around 25%, 7%, and 4% respectively. This alloy offers even greater resistance to corrosion, particularly in harsh environments such as seawater and acidic or chloride-containing solutions. Super duplex stainless steel is commonly used in offshore oil and gas platforms, chemical processing plants, and desalination plants.