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| UNS Number | S32205 / S31803 |
|---|---|
| ASTM Standard | ASTM A182 / A276 / A479 |
| Tensile Strength | 620 MPa min |
| Yield Strength | 450 MPa min |
| Density | 7.80 g/cm³ |
| Max Service Temperature | 300°C |
| Element | Composition (%) |
|---|---|
| Cr | 22.0–23.0 |
| Ni | 4.5–6.5 |
| Mo | 3.0–3.5 |
| N | 0.14–0.20 |
| Mn | ≤2.0 |
| C | ≤0.03 |
| Fe | bal |
Duplex 2205 fasteners derive their unique properties from a balanced dual-phase microstructure containing approximately equal proportions of austenite and ferrite. Chromium provides passivity and oxidation resistance, while molybdenum and nitrogen additions enhance pitting and crevice corrosion resistance in chloride-rich environments. Nickel stabilises the austenite phase, improving toughness and ductility, whereas manganese and silicon assist deoxidation and structural stability during solidification. This carefully controlled composition produces a fine-grained, high-strength alloy with excellent resistance to stress corrosion cracking.
These characteristics make Duplex 2205 fasteners ideal for demanding engineering applications requiring high mechanical strength, superior corrosion resistance and long-term reliability. Their resistance to chloride pitting, crevice attack and stress corrosion cracking makes them well suited for offshore, marine, chemical processing and oil and gas industries. The high yield strength allows for lighter, more compact fastener designs without compromising safety, while excellent weldability and fabrication properties further enhance their suitability for critical structural and pressure-retaining applications.
Specifications
Duplex 2205 Fasteners offer a balanced combination of high tensile strength, corrosion resistance, and dimensional precision for demanding industrial service. Their technical specifications emphasize alloy composition, mechanical performance, and size tolerances, making them suitable for applications requiring reliable fastening under aggressive environments and elevated loads.
| Property | Value |
|---|---|
| Tensile Strength | 620–880 MPa |
| Yield Strength (0.2% Offset) | 450 MPa min |
| Elongation | 25% min |
| Hardness | 28 HRC max / 293 HB max |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion (20–100°C) | 13.0 x10⁻⁶/°C |
| Thermal Conductivity | 19 W/m·K |
| Density | 7.80 g/cm³ |
| Melting Range | 1420–1460°C |
| Maximum Service Temperature | 300°C |
| Standard | Details |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B16.5, MSS SP-75 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6–M100 / ¼"–4" |
| Length Range | 10mm–500mm |
| Available Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Inspection Standards | EN 10204 3.1 / 3.2 |
Applications
