Duplex Stainless Steel Mesh

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: 

 🔹 Common Grades of Duplex Stainless Steel Mesh: 

1. Duplex 2205 (UNS S32205 / S31803)

   – 22% Cr, 5% Ni, 3% Mo, 0.17% N 

   – Best for: Offshore oil & gas, chemical processing, desalination. 

2. Super Duplex 2507 (UNS S32750)

   – 25% Cr, 7% Ni, 4% Mo, 0.28% N 

   – Best for: Extreme chloride environments (seawater, acidic chemicals). 

3. Lean Duplex (e.g., 2101, 2304)

   – 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: 

1. Plain Weave (Most Common)

   – Balanced grid for filtration, sieving, and structural reinforcement. 

   – Mesh Sizes: 0.2 to 200 mesh (openings from ~10mm to 0.075mm). 

2. Twilled Weave

   – Stronger, tighter weave for high-pressure filtration (e.g., oil & gas). 

3. Dutch Weave (Fine Micron Filtration)

   – 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).