Introduction
Duplex stainless steel wire mesh is a high-performance material widely used in demanding industrial applications. This comprehensive guide covers its chemical composition, mechanical properties, and technical specifications to help you understand why it’s the preferred choice for critical filtration and structural applications.
What is Duplex Stainless Steel Wire Mesh?
Duplex stainless steel wire mesh is woven from alloy wires that combine austenitic and ferritic microstructures. This unique dual-phase structure provides superior strength and corrosion resistance compared to standard stainless steels. The addition of molybdenum (Mo) further enhances its performance in aggressive environments.
The two primary grades are:
- UNS S32750 (2507): Super duplex with excellent chloride corrosion resistance
- UNS S31803 (2205): Standard duplex with balanced properties
Chemical Composition
| Element | UNS S32750 (%) | UNS S31803 (%) |
|---|---|---|
| Chromium (Cr) | 24.0 – 26.0 | 21.0 – 23.0 |
| Nickel (Ni) | 6.0 – 8.0 | 4.5 – 6.5 |
| Molybdenum (Mo) | 3.0 – 5.0 | 2.5 – 3.5 |
| Nitrogen (N) | 0.24 – 0.32 | 0.08 – 0.20 |
| Manganese (Mn) | ≤ 1.2 | ≤ 2.0 |
| Carbon (C) | ≤ 0.030 | ≤ 0.030 |
| Silicon (Si) | ≤ 0.8 | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 | ≤ 0.020 |
| Iron (Fe) | Balance | Balance |
The high chromium, molybdenum, and nitrogen content provide exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking.
Mechanical Properties
| Property | UNS S32750 | UNS S31803 | Unit |
|---|---|---|---|
| Tensile Strength | ≥ 795 | ≥ 620 | MPa |
| Yield Strength (0.2% offset) | ≥ 550 | ≥ 450 | MPa |
| Elongation (in 50mm) | ≥ 15 | ≥ 25 | % |
| Hardness (Brinell) | ≤ 293 | ≤ 290 | HB |
| Impact Toughness (Charpy V) | ≥ 60 | ≥ 45 | J @ -46°C |
| Modulus of Elasticity | ~200 | ~200 | GPa |
| Thermal Conductivity | 14 | 19 | W/m·K @ 100°C |
| Coefficient of Thermal Expansion | 13.5 | 13 | µm/m·K (20–100°C) |
| Density | 7.8 | 7.8 | g/cm³ |
UNS S32750 offers higher strength and better low-temperature toughness, while UNS S31803 provides superior elongation and thermal conductivity.
Weave Patterns
Plain Weave
- Simplest and most common pattern
- Each wire passes alternately over and under one wire
- Good balance between filtration and flow rate
- Suitable for general-purpose applications
Twill Weave
- Each wire passes over two and under two wires
- Creates diagonal appearance
- Tighter mesh with smaller openings
- Higher flow rates due to increased open area
- Ideal for enhanced particle retention
Key Advantages
- Exceptional Corrosion Resistance
Excellent resistance to organic and inorganic acids, especially chlorides and diluted hydrochloric acid. - Outstanding Mechanical Strength
High tensile and compressive strength, suitable for high-pressure and impact environments. - Superior Pitting and Crevice Corrosion Resistance
Ideal for marine and chemical environments prone to localized corrosion. - Good Weldability and Fabrication
Easily formed and welded for complex structures and systems. - Thermal Stability
Low thermal expansion and high thermal conductivity for use in high-temperature or cycling environments. - Long Service Life
Reduced maintenance and replacement costs in critical industrial operations.
Applications by Grade
UNS S32750 Applications
- Oil & gas industry filtration and structural components
- Seawater desalination filters and pumps
- Power plant and chemical absorption tower units
- Pressure vessels and storage tanks
- Offshore platforms and seawater systems
UNS S31803 Applications
- Filtration in pulp and paper industry
- Petrochemical process filters
- Food processing equipment and components
- Wastewater treatment and purification systems
- Paper bleaching and drying systems
Conclusion
Duplex stainless steel wire mesh offers an optimal combination of strength, corrosion resistance, and cost-effectiveness. Whether you choose UNS S32750 for extreme environments or UNS S31803 for general industrial applications, this material delivers reliable performance in demanding conditions.
For customized solutions and technical support, contact our engineering team to discuss your specific requirements.
About PFM SCREEN
PFM SCREEN is a leading manufacturer of industrial metal wire mesh and filter elements. With over 30 years of experience, we provide high-quality duplex stainless steel wire mesh for oil & gas, chemical processing, marine, and food industries worldwide.
📞 Phone: +86-316-2188808
📱 WhatsApp: +86-15369379157
📧 Email: sales@pfmscreen.com
🌐 Website: https://www.pfmscreen.com/
