Duplex steel 2205 (UNS S32205) is a ferritic-austenitic alloy with high strength and excellent corrosion resistance, ideal for offshore, petrochemical, and structural applications.
Element | Content (%) |
Chromium (Cr) | 21.0 – 23.0 |
Nickel (Ni) | 4.5 – 6.5 |
Molybdenum (Mo) | 2.5 – 3.5 |
Carbon (C) | ≤ 0.030 |
Manganese (Mn) | ≤ 2.00 |
Silicon (Si) | ≤ 1.00 |
Nitrogen (N) | 0.14 – 0.20 |
Iron (Fe) | Balance |
Property | Value (Typical) | Unit | Condition |
Tensile Strength (Ultimate) | ≥ 620 | MPa | Annealed |
Yield Strength (0.2% Offset) | ≥ 450 | MPa | Annealed |
Elongation (in 50 mm) | ≥ 25 | % | ASTM A370 |
Hardness (Brinell) | ≤ 290 | HB | |
Density | 7.80 | g/cm³ | Room Temp |
Melting Range | 1300 – 1390 | °C | |
Modulus of Elasticity | ~200 | GPa | Room Temp |
Category | Standard Code | Description |
Pipe | ASTM A790 / ASME SA790 | Seamless and welded duplex stainless steel pipe |
Tube | ASTM A813 / ASME SA813 | Welded austenitic-ferritic (duplex) stainless steel pipe |
Fittings | ASTM A824 / ASME SA824 | Duplex stainless steel piping fittings |
