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| Property | Value |
|---|---|
| UNS Number | S32304 |
| DIN/W.Nr. | 1.4362 |
| ASTM Standard | ASTM A182 / A276 |
| Tensile Strength | 600 MPa min |
| Yield Strength | 400 MPa min |
| Density | 7.75 g/cm³ |
| Element | Composition (%) |
|---|---|
| Cr | 21.5–24.5 |
| Ni | 3.0–5.5 |
| Mo | 0.05–0.60 |
| N | 0.05–0.20 |
| Mn | ≤2.5 |
| C | ≤0.030 |
| Fe | bal |
Duplex 2304 fasteners derive their unique properties from a balanced composition of chromium (21.5–24.5%), nickel (3.0–5.5%), molybdenum (0.05–0.60%), and nitrogen (0.05–0.20%). Chromium provides the foundation for passive film formation and corrosion resistance, while nitrogen strengthens the austenite phase and enhances pitting resistance. The controlled nickel content maintains the critical duplex microstructure, delivering an optimal balance of austenite and ferrite phases that distinguishes this grade from standard austenitic stainless steels.
This carefully engineered composition results in superior mechanical strength, approximately twice that of austenitic 304 stainless steel, combined with excellent resistance to chloride stress corrosion cracking and pitting corrosion. The duplex structure also provides good weldability and toughness across a wide temperature range. These characteristics make Duplex 2304 fasteners ideal for demanding applications in marine, chemical processing, and offshore environments where strength, corrosion resistance, and long-term reliability are essential performance requirements.
Specifications
Duplex 2304 Fasteners combine duplex stainless steel mechanical strength with compact dimensional precision for reliable fastening in demanding applications. Their specifications are defined by tensile, yield, and hardness characteristics, along with accurate thread and size tolerances, providing balanced technical performance without requiring every property value.
| Property | Value |
|---|---|
| Tensile Strength | 600 MPa min |
| Yield Strength (0.2%) | 400 MPa min |
| Elongation | 25% min |
| Hardness | 290 HB max |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion (20-100°C) | 13.0 µm/m·°C |
| Thermal Conductivity | 17 W/m·K |
| Density | 7.75 g/cm³ |
| Melting Range | 1420-1460°C |
| Max Service Temperature | 300°C |
| Standard Type | Details |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B18.31, ASTM A182 |
| 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 to M100 / 1/4" to 4" |
| Length Range | 10mm to 500mm |
| Product Forms | Hex bolts, studs, nuts, washers |
| Custom Sizes | Available on request |
| Inspection Standards | EN 10204 3.1, NACE MR0175 |
Applications
