2205
2205 is a two-phase alloy composed of approximately equal parts of ferritic and austenitic stainless steel structures, offering a unique combination of high strength, excellent corrosion resistance, and good weldability. Its chemical composition typically includes 22% chromium, 5–6% nickel, and 3% molybdenum, which provides significantly better resistance to pitting, crevice corrosion, and stress corrosion cracking compared to standard austenitic stainless steels like SS304 and SS316.
The duplex microstructure gives 2205 stainless steel twice the yield strength of austenitic grades, making it ideal for applications requiring both strength and corrosion resistance. It also maintains good toughness and ductility, even at low temperatures, and shows excellent resistance to chloride-induced corrosion, which is critical in marine, chemical processing, oil & gas, desalination, and pulp & paper industries.
