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| Property | Value |
|---|---|
| UNS Number | S32205 |
| DIN/Werkstoff Nr. | 1.4462 |
| Tensile Strength | 620 MPa min |
| Yield Strength | 450 MPa min |
| Density | 7.80 g/cm³ |
| Max Service Temp | 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 |
SS 2205 Duplex fasteners derive their unique dual-phase microstructure from a balanced composition of chromium, molybdenum, and nitrogen alongside controlled nickel content. Chromium levels near 22% establish a stable passive oxide layer, while molybdenum at approximately 3% enhances resistance to localized pitting and crevice attack. Nitrogen additions strengthen the austenite phase and stabilize the ferrite-austenite ratio, ensuring balanced mechanical behavior. Nickel, present in smaller amounts than in standard austenitic grades, supports phase stability without compromising strength.
This engineered composition delivers fasteners with nearly double the yield strength of conventional 316 stainless steel, combined with excellent resistance to chloride-induced stress corrosion cracking. The duplex structure provides superior toughness and fatigue resistance under cyclic loading, making these fasteners ideal for offshore, marine, chemical processing, and desalination applications. Their high strength-to-weight ratio also allows for reduced fastener sizing, improving design efficiency while maintaining long-term structural reliability in aggressive environments.
Specifications
SS 2205 (Duplex) Fasteners offer a balanced combination of strength, corrosion resistance, and toughness, with specifications defined by mechanical properties, dimensional accuracy, and technical requirements for bolts, nuts, and washers used in demanding industrial applications where reliable performance is essential.
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa min |
| Yield Strength (0.2%) | 450 MPa min |
| Elongation | 25% min |
| Hardness | ≤290 HB |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 19 W/m·K |
| Density | 7.80 g/cm³ |
| Melting Range | 1420–1460°C |
| Max Service Temperature | 300°C |
| Category | Details |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASTM A182, 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 – M64 / 1/4" – 2.5" |
| 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
