Duplex steels combine ferritic and austenitic microstructures, delivering superior strength (yield ≥450 MPa in 2205) and resistance to chloride-induced corrosion. Used in offshore and petrochemical fields, they meet standards like ASTM A240 for plates, balancing high tensile performance with durability in harsh environments.
Duplex steels (e.g., 2205) feature a ferritic-austenitic microstructure, combining high strength (tensile ≥620 MPa, yield ≥450 MPa) with excellent corrosion resistance. They contain 21–23% Cr, 4.5–6.5% Ni, and 2.5–3.5% Mo, with density 7.80 g/cm³ and elongation ≥25%, meeting ASTM A240/A790 standards.
Ideal for offshore platforms, petrochemical reactors, and structural components in corrosive environments. ASTM A790 pipes suit seawater systems, while ASTM A240 plates are used in pressure vessels, leveraging their resistance to chloride stress corrosion and high tensile performance.
