ASTM A789 UNS S32750 Super Duplex Stainless Steel Tube
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes are engineered for extremely demanding environments requiring outstanding corrosion resistance, excellent mechanical strength, and long-term durability. UNS S32750 is a super duplex grade that combines high chromium, molybdenum, and nitrogen levels, providing exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking.
Known for its superior performance in chloride-rich, marine, and chemically aggressive conditions, these tubes are widely used in offshore platforms, desalination plants, chemical processing units, and high-pressure heat exchanger systems. Its high strength-to-weight ratio makes it a preferred material for structural and process-critical applications.
Key Features
- Exceptional resistance to pitting and crevice corrosion
- Excellent resistance to chloride-induced stress corrosion cracking
- Very high mechanical strength and toughness
- Low thermal expansion and high thermal conductivity
- Suitable for high-pressure and corrosive applications
- Long service life with superior reliability
Equivalent Grade
| Standard |
Grade |
| UNS |
S32750 |
| EN / DIN |
1.4410 |
| WNR |
1.4410 |
| AFNOR |
Z3 CN 25.06 AZ |
| ASTM |
SAF 2507 |
ASTM A789 UNS S32750 Chemical Composition
| Element |
Percentage (%) |
| Chromium (Cr) |
24.0 – 26.0 |
| Nickel (Ni) |
6.0 – 8.0 |
| Molybdenum (Mo) |
3.0 – 5.0 |
| Manganese (Mn) |
≤ 1.2 |
| Silicon (Si) |
≤ 0.8 |
| Nitrogen (N) |
0.24 – 0.32 |
| Carbon (C) |
≤ 0.03 |
| Phosphorus (P) |
≤ 0.03 |
| Sulfur (S) |
≤ 0.02 |
| Iron (Fe) |
Balance |
ASTM A789 UNS S32750 Mechanical Properties
| Property |
Value |
| Tensile Strength |
≥ 795 MPa |
| Yield Strength (0.2% Proof) |
≥ 550 MPa |
| Elongation |
≥ 25% |
| Hardness |
≤ 310 HB |
Physical Properties
| Property |
Value |
| Density |
7.80 g/cm³ |
| Thermal Conductivity |
14 W/m·K (at 20°C) |
| Electrical Resistivity |
0.86 µΩ·m |
| Modulus of Elasticity |
200 GPa |
| Melting Range |
1350 – 1450°C |
Type of Grade UNS S32750 Tubes
- Seamless Super Duplex Tubes
- Welded Super Duplex Tubes
- ERW Tubes
- EFW Tubes
- Heat Exchanger Tubes
- Hydraulic & Instrumentation Tubes
Application
- Offshore Oil & Gas Equipment
- Subsea Pipelines & Umbilicals
- Marine Engineering Structures
- Desalination Plants
- Chemical Process Industries
- Heat Exchangers & Condensers
- Pulp & Paper Processing
- Pressure Vessels
- High-Chloride Service Environments
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