Duplex stainless steel mesh is a high-performance wire mesh made from austenitic-ferritic (duplex) stainless steels, offering twice the strength of standard austenitic grades (like 304/316) with superior corrosion resistance. The most common grades are 2205 (UNS S32205/S31803) and 2507 (UNS S32750, “super duplex”).
🔹 Why Choose Duplex Stainless Steel Mesh?
Key Advantages:
✔ Higher Strength (2x yield strength vs. 316L) → Longer lifespan in demanding environments.
✔ Excellent Corrosion Resistance → Resists pitting, crevice corrosion, and chloride stress corrosion cracking (SCC).
✔ Good Weldability & Formability → Suitable for complex industrial designs.
✔ Cost-Effective vs. Nickel Alloys → Cheaper than Hastelloy but performs well in harsh conditions.
Comparison with Other Stainless Steels:
Property | Duplex 2205 | 316L | Super Duplex 2507 |
Yield Strength | 450-550 MPa | 170-300 MPa | 550-600 MPa |
PREN (Pitting Resistance) | ≥35 | ~26 | ≥40 |
Chloride Resistance | Excellent | Good | Superior |
Cost | Moderate | Low | High |
🔹 Common Grades of Duplex Stainless Steel Mesh:
– 22% Cr, 5% Ni, 3% Mo, 0.17% N
– Best for: Offshore oil & gas, chemical processing, desalination.
– 25% Cr, 7% Ni, 4% Mo, 0.28% N
– Best for: Extreme chloride environments (seawater, acidic chemicals).
– Lower nickel/molybdenum → Cost-saving alternative where extreme corrosion resistance isn’t needed.
🔹 Weave Types & Specifications:
Duplex mesh comes in multiple weave patterns for different applications:
– Balanced grid for filtration, sieving, and structural reinforcement.
– Mesh Sizes: 0.2 to 200 mesh (openings from ~10mm to 0.075mm).
– Stronger, tighter weave for high-pressure filtration (e.g., oil & gas).
– Ultra-fine mesh for filtering small particles in aggressive media.
🔹 Top Applications of Duplex Stainless Steel Mesh:
✅ Oil & Gas Industry
– Offshore platform filters, seawater intake screens, pipe protection.
– Resists H₂S (sour gas) and chloride corrosion.
✅ Chemical & Petrochemical
– Acid filtration, reactor screens, heat exchanger components.
✅ Desalination & Marine
– Reverse osmosis filters, shipbuilding, coastal infrastructure.
✅ Power Plants & Nuclear
– Flue gas scrubbers, cooling water filtration.
✅ Food & Pharma
– Hygienic, corrosion-resistant filters for CIP (clean-in-place) systems.
✅ Architectural & Security
– Decorative panels, blast-resistant barriers (high strength).
🔹 Limitations & Considerations
❌ Not ideal for extreme temperatures (>300°C) → Can lose duplex structure.
❌ More expensive than 304/316 → Justified only for harsh environments.
❌ Slightly magnetic (due to ferritic phase) → Not suitable for non-magnetic applications.
🔹 What to Buy?
– Available Forms: Rolls, sheets, custom-cut panels, welded mesh.
🔹 Alternatives
– For cost savings: 316L (if chloride exposure is moderate).
– For extreme corrosion: Super Duplex 2507 or Nickel Alloys (Hastelloy).