When a major offshore oil platform faced catastrophic failures from chloride-induced stress corrosion cracking using conventional austenitic stainless steels, engineers made a strategic pivot to Duplex 2205 & S31803 Sheets. The result was transformative equipment life doubled, maintenance schedules extended, and unplanned downtime virtually disappeared. This nitrogen-enhanced duplex stainless steel combines the best of both ferritic and austenitic worlds, delivering twice the strength of 316L while resisting the most aggressive chloride, acidic, and marine environments. Aurico Alloys LLP supplies certified Duplex 2205 Sheets to procurement heads, engineers, fabricators, and OEMs across chemical, oil & gas, marine, pharmaceutical, and power generation industries worldwide.
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Duplex 2205 (UNS S31803/S32205, ASTM A240, EN 1.4462) represents a breakthrough in stainless steel metallurgy a balanced microstructure of approximately 50% austenite and 50% ferrite phases engineered for extreme service conditions. With 22% chromium, 5-6% nickel, 3% molybdenum, and critical nitrogen enhancement (0.14-0.20%), this alloy achieves a Pitting Resistance Equivalent Number (PREN) of ~35, far exceeding 316L and 317L austenitic steels. The dual-phase structure grants high yield strength (≥450 MPa), nearly double that of standard austenitics, while maintaining excellent toughness, weldability, and fabricability. This unique combination makes Duplex 2205 the workhorse grade for pressure vessels, heat exchangers, chemical processing equipment, marine structures, and oil & gas piping where both strength and corrosion resistance are non-negotiable.
Aurico Alloys LLP provides ASTM A240 certified Duplex 2205 & S31803 Sheets in hot-rolled, cold-rolled, annealed, and pickled finishes, with thickness ranges from 0.2mm to 4.75mm and widths up to 2500mm. Every batch includes complete mill test certificates, ASTM/ASME/EN certifications, and full traceability, ensuring global compliance for critical projects. Our extensive inventory supports urgent shutdowns, OEM manufacturing, and large-scale fabrication with rapid delivery and custom cutting services.
Choosing Aurico's Duplex 2205 Sheets means specifying a material that outperforms both austenitic and super-austenitic alternatives in chloride-rich, high-stress environments delivering superior value through extended equipment life, reduced wall thickness requirements, lower lifecycle costs, and proven reliability in the world's harshest industrial conditions.
High-quality Duplex 2205 & 31803 Sheets ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grade | Duplex 2205 (UNS S31803, S32205, EN 1.4462) |
| Standards | ASTM A240, ASME SA240, EN 10028-7, NACE MR0175 |
| Thickness Range | 0.2 mm – 4.75 mm |
| Width | Up to 2500 mm |
| Length | Up to 6000 mm (custom available) |
| Finish | Hot rolled, cold rolled, 2B, 2D, BA, No.1, No.4, pickled, polished |
| Forms | Sheets, plates, coils, strips, blanks, circles, perforated sheets |
| Certification | Full Mill Test Certificates, RoHS/REACH, EN 10204 3.1, traceability |
| Price | INR 450 – 750 per kg. Indicative USD 5 – 9 per kg; quoted against grade, form, size and quantity. |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | S32205 / S31803 |
| Werkstoff / EN number | 1.4462 |
| EN designation | X2CrNiMoN22-5-3 |
| Density | 7.80 g/cm3 |
| Melting range | 1430 °C |
| Specific heat (20 °C) | 460 J/kg·K |
| Thermal conductivity (20 °C) | 13.5 W/m·K |
| Coefficient of expansion (20–200 °C) | 14.0 µm/m·K |
| Coefficient of expansion (20–400 °C) | 14.5 µm/m·K (Thermal expansion 25% lower than 316L – comparable with carbon steel) |
| Electrical resistivity (20 °C) | 0.8 Ω·mm²/m |
| Young's modulus (20 °C) | 200 GPa |
| Magnetic | yes |
| Oil and gas conformance | NACE MR0175 / ISO 15156-3 · NACE MR0103 / ISO 17945 · Norsok M-630 MDS D55 (Aperam DX1803/DX2205 Technical Data Sheet) |
| Plate, sheet and strip specification | ASTM A240 |
Identifiers and physical constants for Duplex 2205. A dash means no such designation is published for this grade.
Stock & Product Availability
Aurico Alloys LLP maintains a comprehensive inventory of Duplex 2205 & S31803 Sheets in multiple thicknesses and finishes, supporting immediate dispatch for chemical, oil & gas, marine, pharmaceutical, and power generation projects globally. Custom fabrication, precision cutting, and urgent delivery for shutdown maintenance are readily available.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.030 |
| Manganese (Mn) | — | 1.80 |
| Phosphorus (P) | — | 0.030 |
| Sulfur (S) | — | 0.0007 |
| Silicon (Si) | — | 0.50 |
| Chromium (Cr) | 22.20 | 22.50 |
| Nickel (Ni) | 5.1 | 5.3 |
| Molybdenum (Mo) | 3.10 | 3.30 |
| Nitrogen (N) | 0.16 | 0.18 |
| Aluminium (Al) | — | 0.015 |
Composition limits for Duplex 2205. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 620 – 800 (90 – 116 ksi) |
| Yield Strength (0.2%, MPa) | 450 – 650 (65 – 94 ksi) |
| Elongation (%) | ≥25 |
| Hardness (HB) | ≤290 |
| Modulus of Elasticity (GPa) | 190 – 200 |
| Max Service Temperature (°C) | Up to 300 (continuous), intermittent to 600°F |
| PREN (Pitting Resistance) | ~35 |
Applications & Benefits
- Chemical Processing: Pressure vessels, reactors, heat exchangers, evaporators, storage tanks for acids and chloride environments
- Oil & Gas: Offshore platforms, pipeline systems, flowlines, separators, umbilicals, sour gas service, downhole equipment
- Marine: Seawater-cooled condensers, desalination plants, marine structures, ship cargo tanks, scrubber systems
- Pulp & Paper: Digesters, bleach washers, chip pre-steaming vessels, stock handling systems
- Food Processing: Storage tanks, piping, processing equipment requiring high hygiene and corrosion resistance
- Power Generation: Flue gas desulfurization (FGD) systems, heat exchangers, cooling systems, turbine components
- Biofuels: Production equipment, storage, and transport systems
- OEM & Fabrication: High-strength structural components, custom vessels, pressure equipment where weight reduction and corrosion resistance are critical
FAQ & Insights
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Aurico Alloys LLP's Duplex 2205 & S31803 Sheets deliver the optimal balance of exceptional mechanical strength, superior corrosion resistance, cost-effectiveness, and global certification for the most demanding chemical, oil & gas, marine, pharmaceutical, and power generation applications. When your projects require materials that combine twice the strength of austenitic steels with proven resistance to chloride stress corrosion cracking and aggressive environments, are you ready to specify Duplex 2205 Sheets from Aurico the trusted supplier committed to your operational excellence?