| Customization: | Available |
|---|---|
| Application: | Chemical Industry, Oil and Gas Industry, Building Material |
| Carbon Content: | Low Carbon Steel |
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UNS S31803 (Duplex 2205), S32304 (Lean Duplex), and S32506 (Super Duplex) are high-performance duplex stainless steel welded pipes. These grades combine austenitic and ferritic microstructures, offering exceptional mechanical strength, corrosion resistance, and cost efficiency for demanding industrial environments.
| Property | UNS S31803 | UNS S32304 | UNS S32506 |
|---|---|---|---|
| Material Type | Standard Duplex | Lean Duplex (Economy Grade) | Super Duplex |
| Chemical Composition | Cr (21-23%), Mo (3-3.5%), Ni (4.5-6.5%), N (0.08-0.2%) | Cr (23-25%), Mo (0.1-0.6%), Ni (3-5.5%), Mn (≤2.0%) | Cr (24-26%), Mo (6-8%), Ni (6-8%), N (0.2-0.35%) |
| Mechanical Strength | High tensile strength (≥620 MPa) | Moderate strength (≥600 MPa) | Ultra-high strength (≥800 MPa) |
| Corrosion Resistance | Excellent resistance to chlorides, acids, and stress corrosion cracking (SCC). | Good resistance to mild acids and atmospheric corrosion. | Superior resistance to pitting, crevice corrosion, and sour environments (HS). |
| Temperature Range | -50°C to 300°C (-58°F to 572°F) | -50°C to 250°C (-58°F to 482°F) | -50°C to 350°C (-58°F to 662°F) |
| Weldability | Compatible with TIG, MIG, and SAW methods. Post-weld heat treatment optional. | Easy to weld with standard techniques; minimal distortion. | Requires precise control (e.g., low heat input) but achieves strong joints. |
| Standards & Compliance | ASME SA790, ASTM A928, EN 1.4462 | ASTM A790, EN 1.4362 | ASME SA789, NACE MR0175, EN 1.4507 |
Optimized Strength-to-Weight Ratio:
Duplex microstructure delivers 2x higher yield strength than standard austenitic steels (e.g., 316L), enabling thinner, lighter pipe designs without compromising performance.
Enhanced Corrosion Resistance:
UNS S31803: Ideal for seawater, oil/gas pipelines, and chemical processing.
UNS S32304: Cost-effective for mildly corrosive environments (e.g., water treatment, structural applications).
UNS S32506: Perfect for extreme conditions (e.g., offshore platforms, acidic/chloride-rich media).
Thermal Stability:
Maintains mechanical integrity under fluctuating temperatures and high-pressure conditions.
Fabrication Flexibility:
Welded pipes allow large diameters and custom lengths, reducing installation complexity.
Smooth weld seams ensure minimal turbulence in fluid transport.
UNS S31803:
Oil/gas flowlines, desalination plants, heat exchangers.
Chemical tankers and pulp/paper processing equipment.
UNS S32304:
Water distribution systems, architectural structures, HVAC.
Food processing and industrial exhaust systems.
UNS S32506:
Subsea pipelines, sour gas wells, sulfuric acid reactors.
Nuclear waste handling and high-temperature geothermal systems.
Manufactured under strict standards:
Hydrostatic/pneumatic testing for leak-proof performance.
Non-destructive testing (NDT): RT (radiographic), UT (ultrasonic), or ET (eddy current).
Certified traceability of chemical and mechanical properties.
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