ASTM A789 UNS S32950 Duplex Stainless Steel Tubes
ASTM A789 UNS S32950 Super Duplex Stainless Steel Tubes are designed for highly corrosive and demanding industrial applications where superior mechanical strength, excellent pitting resistance, and long-term durability are mandatory. UNS S32950 contains a balanced mix of chromium, nickel, molybdenum, and nitrogen, offering enhanced resistance to chloride-induced stress corrosion cracking, crevice corrosion, and general corrosion.
These tubes are ideal for offshore oil & gas platforms, desalination plants, chemical processing equipment, and high-pressure fluid transport systems. Their excellent corrosion resistance in seawater and high-chloride environments makes them one of the most reliable materials for harsh industrial conditions.
Key Features
- Exceptional resistance to pitting and crevice corrosion
- High strength and excellent structural integrity
- Superior performance in chloride-rich and marine environments
- Higher mechanical properties than standard duplex grades
- Low thermal expansion and good thermal conductivity
- Suitable for high-pressure and corrosive media applications
ASTM A789 UNS S32950 Chemical Composition
| Element |
Percentage (%) |
| Chromium (Cr) |
24.0 – 27.0 |
| Nickel (Ni) |
4.5 – 6.5 |
| Molybdenum (Mo) |
3.0 – 4.0 |
| Copper (Cu) |
1.5 – 2.5 |
| Manganese (Mn) |
≤ 1.5 |
| Silicon (Si) |
≤ 1.0 |
| Nitrogen (N) |
0.20 – 0.30 |
| Carbon (C) |
≤ 0.03 |
| Phosphorus (P) |
≤ 0.03 |
| Sulfur (S) |
≤ 0.01 |
| Iron (Fe) |
Balance |
ASTM A789 UNS S32950 Mechanical Properties
| Property |
Value |
| Tensile Strength |
≥ 750 MPa |
| Yield Strength (0.2% Proof) |
≥ 500 MPa |
| Elongation |
≥ 25% |
| Hardness |
≤ 300 HB |
UNS S32950 Physical Properties
| Property |
Value |
| Density |
7.80 g/cm³ |
| Thermal Conductivity |
14–16 W/m·K |
| Electrical Resistivity |
0.85 µΩ·m |
| Modulus of Elasticity |
200 GPa |
| Melting Range |
1380 – 1450°C |
Types of UNS S32950 Tubes
- Seamless Super Duplex Tubes
- Welded Super Duplex Tubes
- ERW Tubes
- EFW Tubes
- Heat Exchanger Tubes
- Hydraulic & Instrumentation Tubes
Application
- Offshore Oil & Gas Structures
- Subsea Pipelines & Marine Systems
- Desalination Plants
- Chemical & Petrochemical Processing
- High-Pressure Heat Exchangers
- Pressure Vessels & Boilers
- Pulp & Paper Industry
- Power Generation Systems
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