ASTM A789 UNS S32760 Super Duplex Stainless Steel Tube
ASTM A789 UNS S32760 Super Duplex Stainless Steel Tubes are designed for critical applications that demand exceptional corrosion resistance, superior strength, and excellent performance in highly aggressive environments. UNS S32760 is a premium super duplex alloy enriched with chromium, molybdenum, tungsten, and nitrogen, providing outstanding resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion.
This grade is widely used in offshore platforms, marine engineering, chemical processing, and high-pressure systems where long service life and structural reliability are essential. Its excellent mechanical properties combined with superior corrosion resistance make it a cost-effective solution for harsh industrial environments.
Key Features
- Exceptional resistance to pitting and crevice corrosion
- High strength suitable for demanding load-bearing applications
- Excellent resistance to stress corrosion cracking in chloride environments
- High thermal conductivity with low thermal expansion
- Suitable for high-pressure and corrosive services
- Long-lasting performance with reduced maintenance
Equivalent Grade
| Standard |
Grade |
| UNS |
S32760 |
| EN / DIN |
1.4501 |
| WNR |
1.4501 |
| ASTM |
Zeron 100 |
| AFNOR |
X2 CrNiMoCuWN 25.7.4 |
ASTM A789 UNS S32760 Chemical Composition
| Element |
Percentage (%) |
| Chromium (Cr) |
24.0 – 26.0 |
| Nickel (Ni) |
6.0 – 8.0 |
| Molybdenum (Mo) |
3.0 – 4.0 |
| Copper (Cu) |
0.50 – 1.0 |
| Tungsten (W) |
0.5 – 1.0 |
| Manganese (Mn) |
≤ 1.0 |
| 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 S32760 Mechanical Properties
| Property |
Value |
| Tensile Strength |
≥ 750 MPa |
| Yield Strength (0.2% Proof) |
≥ 550 MPa |
| Elongation |
≥ 25% |
| Hardness |
≤ 300 HB |
Physical Properties
| Property |
Value |
| Density |
7.80 g/cm³ |
| Thermal Conductivity |
15 W/m·K (at 20°C) |
| Electrical Resistivity |
0.85 µΩ·m |
| Modulus of Elasticity |
200 GPa |
| Melting Range |
1350 – 1450°C |
Type of Grade UNS S32760 Tubes
- Seamless Super Duplex Tubes
- Welded Super Duplex Tubes
- ERW Tubes
- EFW Tubes
- Hydraulic Tubes
- Heat Exchanger Tubes
- Instrumentation Tubes
Application
- Offshore and Subsea Oil & Gas Structures
- Marine Engineering & Seawater Systems
- Chemical & Petrochemical Processing
- Pulp & Paper Industry
- Desalination Plants
- High-Pressure Heat Exchangers
- Power Generation
- Pressure Vessels & Boilers
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