2205 Duplex Stainless Steel Round Bar | Dual-Phase Excellence for Harsh Environments
✓ Double the Strength: Yield strength ≥450 MPa – 2x higher than 316L – reduces material thickness and weight.
✓ Chloride Crusher: PREN ≥34, validated by 10,000+ hours in ASTM G48 Method D seawater testing.
✓ Stress Corrosion Immunity: Resists chloride-induced SCC up to 150°C (302°F) per NACE TM0177.
✓ Welding Simplified: Maintains phase balance with AWS A5.9 ER2209 filler, no post-weld heat treatment required.
2205 Duplex Stainless Steel Round Bar (UNS S32205/S31803)
Engineered to excel in extreme thermal conditions, 310S stainless steel round bar delivers unmatched oxidation resistance and creep strength at temperatures up to 1,150°C (2,102°F). With a high chromium-nickel composition (25% Cr, 20% Ni), this austenitic alloy forms a self-healing oxide layer, outperforming conventional grades in furnace components, heat treatment fixtures, and aerospace systems. Certified to ASTM A276/A479 and ASME BPVC Section II, it is the ultimate choice for applications demanding durability under relentless thermal cycling.
- Diameter Range: 5mm–300mm (hot-rolled ±0.5%; cold-drawn ±0.05mm)
- Length: 1m–6m standard (cut-to-length precision ±1mm)
- Surface Finishes: Hot Rolled, Peeled, Polished (Ra ≤0.8μm), or Shot Blasted (SA 2.5)
- Mechanical Properties: Yield Strength ≥205 MPa | Tensile Strength ≥515 MPa | Elongation ≥40%
| Parameter Category | Value/Description |
|---|---|
| Material Grade | UNS S32205 / S31803 (per ASTM A276) |
| Composition (%) | C≤0.03, Cr 22.0-23.0, Ni 4.5-6.5, Mo 3.0-3.5, N 0.14-0.20, Mn≤2.0, Si≤1.0, P≤0.03, S≤0.02 |
| Tensile Strength (MPa) | ≥620 (Solution Annealed) |
| Yield Strength (MPa) | ≥450 (Solution Annealed) |
| Elongation (%) | ≥25 (50mm gauge length) |
| Hardness | Brinell (HBW): ≤290; Rockwell (HRC): ≤31 (Solution Annealed) |
| Density (g/cm³) | 7.80 |
| Melting Range | 1370-1400℃ |
| Thermal Conductivity (W/m·K) | 15.0 (20℃) |
| Thermal Expansion (10⁻⁶/℃) | 13.0 (20-100℃) |
| Electrical Resistivity (Ω·m) | 0.80×10⁻⁶ (20℃) |
| Elastic Modulus (GPa) | 200 |
| Magnetic Properties | Weakly magnetic (due to duplex microstructure) |
| Corrosion Resistance | Excellent resistance to chloride stress corrosion cracking (SCC), pitting, and crevice corrosion (PREN ≥34); resistant to sulfuric acid, phosphoric acid |
| Heat Treatment | Solution Annealing: 1020-1100℃ followed by rapid cooling (water quenching) |
| Surface Finishes | Black (Hot-rolled), Cold-drawn, Polished, Pickled & Passivated |
| Dimension Range | Diameter: 5mm-300mm; Length: 3000mm/6000mm (standard) |
| Standards | ASTM A276/A479, EN 10088-3, NORSOK MDS D45, ASME SA276 |
| Applications | Oil & gas pipelines, chemical processing equipment, seawater systems, heat exchangers, pressure vessels, offshore platforms |
2205 Duplex Stainless Steel Round Bar Applications
| Industry | Critical Components | 2205 Round Bar Advantage |
|---|---|---|
| Oil & Gas | Subsea Christmas tree valves, drill collars | Resists H₂S-induced cracking at 10,000 ppm per NACE MR0175. |
| Chemical Plants | Acid evaporators, phosphoric acid reactors | 0.01mm/year corrosion rate in 40% H₂SO₄ at 60°C. |
| Desalination | High-pressure pump shafts, RO membranes | Withstands 30,000 ppm chloride at 80°C (176°F). |
| Pulp & Paper | Bleach washers, digesters | Immune to caustic stress corrosion up to 50% NaOH. |
2205 Duplex Stainless Steel Round Bar Product Packaging
2205 Duplex Stainless Steel Round Bar are precision-engineered for superior corrosion resistance and mechanical strength, meeting ASTM A276 and ISO 3506 standards. To ensure optimal performance from factory to your facility, we implement rigorous packaging protocols and logistics safeguards.
Small Bars (<50mm)
Bundled with steel straps + VCI-coated wraps, crated on reinforced wooden pallets.
Large Bars (≥50mm)
End caps + edge protectors, stacked in custom steel racks with desiccant units.
Anti-Scratch Sleeving
Silicone-impregnated fabric for polished/ground surfaces.
RFID Tags
Embedded tracking chips with real-time material certification access.
Why Choose Us
Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。
Full specification coverage & flexible customization
Unlimited size: thickness 0.1mm ultra-thin plate to 300mm extra-thick plate, width up to 2000mm, support non-standard cutting. Various surface treatments: 2B, BA mirror, brushed (No.4), sandblasting, etc., to meet food grade, medical grade or decorative needs.
Global Certification & Quality Assurance
Full-process certification: products comply with international standards such as ASTM, EN, JIS, and provide traceable MTC (factory test certificate). Strict quality inspection: from raw materials to finished products, 100% pass spectral analysis, hardness test and salt spray test to ensure zero-defect delivery.
Fast delivery & global supply
Multi-location warehousing: strategic inventory in Asia, Europe, and America, urgent orders will arrive globally within 15 days. One-stop service: provide value-added services such as striping, laser cutting, welding processing, etc. to shorten customer production cycle.
Industry Solution Experts
Cross-domain experience: 20 years of experience in the chemical, energy, construction, medical and other industries, providing targeted material selection guides.
Technical support: Free welding parameter recommendations, corrosion resistance reports and installation guidance to reduce customer risks.
Cost optimization capabilities
Price transparency: Direct-operated factories have no middleman price difference, long-term customers enjoy tiered discounts and quarterly price lock services. Zero waste commitment: Precise cutting according to customer drawings, and surplus material repurchase plan to reduce material waste.
Sustainable production
Environmentally friendly process: Using electric arc furnace (EAF) steelmaking, 90% of the raw materials are recycled steel, and the carbon footprint is reduced by 40%. Circular economy: Provide scrap stainless steel plate recycling and remelting services to help customers achieve ESG goals.
2205 Duplex Stainless Steel Round Bar Shipping
Sea transport
40HQ container (loading capacity 28 tons) / bulk carrier (LCL minimum 1 ton)
Air transport
reach major airports around the world within 7 days (DDP/DAP terms)
Land transport
door-to-door within China (qualification for dangerous goods transportation)
Our Services
We guarantee global door-to-door delivery within 7–15 business days via partnerships with DHL, Maersk, and UPS.
FAQ
Q1: How does 2205 compare to 2507 super duplex stainless steel?
A: 2205 offers 80% of 2507’s strength at 60% cost, ideal for temperatures <150°C. Upgrade to 2507 only for >25,000 ppm chloride or >200°C service.
Q2: What welding practices ensure phase balance?
A: Use ER2209 filler with 0.5-1.5 kJ/mm heat input and interpass T ≤150°C. No post-weld annealing required.
Q3: Are bars compliant with offshore standards?
Yes, all shipments include:
- NACE MR0175/ISO 15156-3 certification
- DNVGL-OS-B101 marine compliance
- EN 10204 3.1 MTC with PMI
Q4: What’s the MOQ for custom cold-drawn bars?
Standard sizes: 5 ton.
Cold-drawn custom diameters: 10 tons (lead time 30 days).
Q5: How to prevent pitting in stagnant seawater?
A: Specify Electropolished Finish (Ra ≤0.5μm) – reduces pitting initiation risk by 90% vs pickled surfaces.
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