Duplex 2304 Stainless Steel Round Bar (UNS S32304)
Duplex 2304 Stainless Steel Round Bar is a lean duplex stainless steel grade offering an excellent balance of high strength, good corrosion resistance, and cost efficiency. Identified by UNS S32304 (EN 1.4362), this alloy is designed as a cost-effective alternative to 304L and 316L, delivering nearly double the yield strength with improved resistance to stress corrosion cracking.
It is widely used in structural, chemical, and industrial applications where moderate corrosion resistance and high mechanical strength are required.
Key Features
- High yield strength compared to austenitic grades
- Good resistance to stress corrosion cracking
- Better pitting resistance than 304L
- Lower nickel and molybdenum content for cost efficiency
- Good weldability and fabrication characteristics
- Suitable for chloride-containing environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S32304 |
| EN | 1.4362 |
| DIN | X2CrNiN23-4 |
| AFNOR | Z2CN23-04 |
| JIS | SUS 329J3L (lean duplex range) |
Sizes
- Diameter: 6 mm to 450 mm
- Length: 3 m, 6 m, or cut-to-length
- Tolerance: H8 / H9 / H11 or as required
Duplex 2304 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 21.5 – 24.5 |
| Nickel (Ni) | 3.0 – 5.5 |
| Nitrogen (N) | 0.05 – 0.20 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.015 |
UNS S32304 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 600 – 850 MPa |
| Yield Strength (0.2%) | ≥ 400 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 280 HB |
Duplex 2304 Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Melting Point | 1350 – 1450°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 19 W/m·K |
| Electrical Resistivity | 0.85 µΩ·m |
Types of Duplex 2304 Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Centerless Ground Bar
Applications
- Structural and construction components
- Chemical processing equipment
- Storage tanks and pressure vessels
- Heat exchangers
- Pulp & paper industry equipment
- Architectural and industrial fabrications
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