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Lean Duplex 2304 Overview
Duplex 2304 (UNS S32304) is a 23% chromium, 4% nickel, molybdenum-free
duplex stainless steel grade. It belongs to the "Lean Duplex" family, offering corrosion
resistance properties similar to 316L but with nearly double the yield
strength. This allows engineers to design thinner-walled pipes, leading to
significant weight and cost savings in construction and chemical processing.
Due to its balanced austenitic-ferritic microstructure, Grade 2304 provides excellent
resistance to localized corrosion and stress corrosion cracking (SCC). Steel
Emporium supplies 2304 pipes for food processing, waste water treatment,
and structural frameworks.
Key Advantages & Features
High Yield Strength
Double the yield strength of 316L, allowing thinner walls and significant weight savings.
Price Stability
Molybdenum-free and low-nickel content ensure a lower and more stable market price.
SCC Resistance
Superior immunity to Chloride Stress Corrosion Cracking in industrial environments.
Excellent Weldability
Good weldability and ductility for easy fabrication of complex shapes and structures.
Pitting Resistance
High chromium content provides good resistance to pitting and crevice corrosion.
Eco-Friendly
Lower alloy content means reduced environmental impact during production and recycling.
| Grade | Cr | Ni | Mo | N | C (max) | Mn | Si |
|---|---|---|---|---|---|---|---|
| Duplex 2304 | 21.5 - 24.5 | 3.0 - 5.5 | 0.05 - 0.60 | 0.05 - 0.20 | 0.030 | 2.50 | 1.00 |
| Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength (min) | 600 MPa | 87,000 psi |
| Yield Strength 0.2% Offset (min) | 400 MPa | 58,000 psi |
| Elongation (% in 50mm) | 25% min | 25% min |
| Hardness (Brinell) max | 290 HBW | 32 HRC |
| PREN (min) | 24.0 | - |
| UNS | Werkstoff No. | EN Name | Common Name |
|---|---|---|---|
| S32304 | 1.4362 | X2CrNiN23-4 | Alloy 2304 / Lean Duplex |
| NB Size | OD (mm) | SCH 10S | SCH 40S | SCH 80S |
|---|---|---|---|---|
| 1/2" | 21.34 | 1.26 | 1.62 | 2.11 |
| 1" | 33.40 | 2.08 | 3.23 | 4.23 |
| 2" | 60.33 | 3.91 | 5.41 | 7.45 |
| 4" | 114.30 | 11.00 | 16.02 | 22.24 |
| 6" | 168.28 | 16.21 | 28.15 | 42.41 |
Industrial Applications
Chemical Processing
Tanks and vessels handling organic acids and chloride solutions.
Waste Water Treatment
Pipes and tanks for municipal and industrial water treatment plants.
Food Processing
Hygienic piping for food and beverage production lines.
Structural Applications
Bridges, handrails and structural frameworks requiring high strength.
Pulp & Paper
Digesters and bleaching equipment in pulp and paper mills.
Oil & Gas
Onshore pipelines and process equipment in mild sour service.
Frequently Asked Questions
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