In industries where material failure can lead to catastrophic downtime or safety risks, selecting the right round bar material is paramount. Picture an offshore refinery battling harsh acidic environments and fluctuating temperatures - the traditional steels fail quicker than maintenance crews can respond. Enter AM 350 Round Bars, a precipitation-hardening stainless steel combining exceptional strength and superior corrosion resistance, designed to meet the demanding standards of chemical, oil & gas, marine, pharmaceutical, and power generation sectors. This is not just another alloy; it’s the solution that transforms equipment reliability and lifecycle economics.
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Duplex grades like 2205 and 31803, represented by UNS S32205 and ASTM A276 respectively, offer a microstructure balanced between austenite and ferrite phases. This unique structure contributes to enhanced toughness, elevated strength, and superior resistance against stress corrosion cracking a known issue in chloride-rich and sour environments. These properties make Duplex 2205 & 31803 the preferred alloys for fabrication and OEM manufacturing that demand both mechanical integrity and chemical resilience.
Aurico Alloys LLP, a trusted manufacturer and stockist, supplies these round bars with full certification and global compliance, ensuring peace of mind for procurement heads, engineers, fabricators, and hardware distributors. With readily available stock, precise machining, and tailored solutions, Aurico supports industrial sectors requiring prompt delivery and uncompromising quality.
This article explores the specifications, chemical and mechanical properties, equivalencies, applications, and benefits of Duplex 2205 & 31803 Round Bars. It’s a comprehensive guide aligned with UNS, ASTM, EN, and other international standards, empowering decision-makers with the insights needed to optimize asset longevity and safety.
High-quality Duplex 2205 & 31803 Round Bars ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grades | Duplex 2205 (UNS S32205), Duplex 31803 |
| Standards | ASTM A276/A479, UNS S32205, EN 10088-5 |
| Diameter Range | 6mm – 200mm (standard available sizes) |
| Length | Cut-to-length per requirement |
| Finish | Bright, hot-rolled, machined, ground |
| Delivery | Full MTC, RoHS & REACH compliant, export packed |
| Price | INR 400 – 650 per kg. Indicative USD 5 – 8 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) |
| Rod and bar specification | ASTM A276 / A479 |
Identifiers and physical constants for Duplex 2205. A dash means no such designation is published for this grade.
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 & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 620 - 850 |
| Yield Strength 0.2% Proof (MPa) | 450 - 550 |
| Elongation (%) | 25 - 35 |
| Hardness (HB) | ≤280 |
| Max Operating Temp (°C) | up to 300 |
| Impact Energy (ISO) at -40°C | >40 J |
Applications & Benefits
- Chemical Process Industry: Optimal for heat exchangers, tanks, and piping dealing with chlorides and acids due to excellent pitting and crevice corrosion resistance.
- Oil & Gas: To combat chloride stress corrosion cracking in pipelines, manifolds, and offshore equipment, Turbocharged by superior mechanical properties.
- Marine: Perfect for seawater cooling applications, desalination plants, and marine fasteners where metal degradation is critical.
- Pharmaceutical: Used in hygienic process equipment requiring resistance to aggressive media combined with structural strength.
- Power Generation: Heat exchangers and condensers where thermal cycling and corrosion resistance drive material selection.
- Hardware & Industrial Distribution: Reliable stock for fabricators and OEM manufacturers needing certified, readily available material.
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network Across India
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Duplex 2205 & 31803 Round Bars, meeting stringent UNS, ASTM, and EN standards, combine outstanding corrosion resistance and high strength essential for the chemical, oil & gas, marine, pharmaceutical, and power generation industries. Supplied by reputed firms like Aurico Alloys LLP, they represent the smart choice for procurement, engineering, and fabrication professionals seeking durable materials with verified quality and on-time availability. Are your projects leveraging the durability and cost-efficiency that Duplex 2205 & 31803 Round Bars can deliver?