ASTM A789 UNS S32520 Duplex Stainless Steel Tubes
ASTM A789 UNS S32520 is a high-strength duplex stainless steel grade engineered for exceptional corrosion resistance, mechanical strength, and durability in harsh and chloride-rich environments. With its duplex microstructure of ferrite and austenite, UNS S32520 provides superior performance compared to standard stainless steel grades.
Its enhanced alloying elements, including high chromium, molybdenum, nitrogen, and tungsten, deliver excellent pitting and crevice corrosion resistance. UNS S32520 Tubes under ASTM A789 are widely used in desalination plants, offshore installations, heat exchangers, and chemical processing industries where reliability and corrosion performance are critical.
Key Features
- High tensile and yield strength due to duplex structure
- Excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking
- Superior toughness and fatigue resistance
- Outstanding performance in seawater and aggressive chemical environments
- Good weldability and fabricability
- Long-lasting durability under high pressure and temperature
Equivalent Grade
| Standard | Equivalent Grade |
|---|---|
| UNS | S32520 |
| EN | 1.4520 (Nearest comparable grade) |
| WNR | Available on request |
| Other Trade Names | Super Duplex Variant |
ASTM A789 UNS S32520 Chemical Composition
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 5.0 – 7.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Tungsten (W) | 1.5 – 2.0 |
| Nitrogen (N) | 0.20 – 0.35 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.030 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
| Iron (Fe) | Balance |
Grade UNS S32520 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 750 MPa |
| Yield Strength | ≥ 550 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 290 HBW |
Grade UNS S32520 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | ~14 W/m·K |
| Electrical Resistivity | 0.85 µΩ·m |
| Melting Range | 1350–1450°C |
Types of UNS S32520 Tubes
- Seamless Tubes
- Welded Tubes
- ERW Tubes
- EFW Tubes
- Heat Exchanger Tubes
- Hydraulic Tubes
- Instrumentation Tubes
- U-Bend Tubes
- Coiled Tubes
Applications
- Offshore Oil & Gas Platforms
- Shipbuilding and Marine Applications
- Desalination Plants and Water Treatment
- Chemical Processing Equipment
- Petrochemical Refineries
- Pulp & Paper Industry
- High-Pressure Heat Exchangers
- Structural and Mechanical Components
- Power Generation Systems
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