ASTM A789 UNS S32900 Duplex Stainless Steel Tubes
ASTM A789 UNS S32900 Duplex Stainless Steel Tubes are engineered for demanding industrial applications requiring a combination of high strength, excellent corrosion resistance, and superior durability. UNS S32900 is a duplex stainless steel grade that offers a balanced microstructure of austenite and ferrite, ensuring improved resistance to pitting, crevice corrosion, and stress corrosion cracking.
With enhanced mechanical performance and long-term reliability, ASTM A789 UNS S32900 tubes are widely used in marine systems, offshore structures, chemical process equipment, heat exchangers, and pressure piping where consistent performance is essential.
Key Features
- High resistance to pitting, crevice corrosion, and chloride stress cracking
- Twice the strength of standard austenitic stainless steels
- Excellent performance in seawater and brine environments
- Good weldability and fabrication properties
- Long service life with minimal maintenance
- Suitable for high-pressure and corrosive service conditions
Equivalent Grade
| Standard |
Grade |
| UNS |
S32900 |
| DIN / EN |
1.4477 (nearest comparable) |
| AFNOR |
Z3CND17-11 |
| JIS |
SUS329J1 |
ASTM A789 UNS S32900 Chemical Composition
| Element |
Percentage (%) |
| Chromium (Cr) |
23.0 – 28.0 |
| Nickel (Ni) |
2.5 – 5.0 |
| Molybdenum (Mo) |
≤ 1.0 |
| Manganese (Mn) |
≤ 1.5 |
| Silicon (Si) |
≤ 1.0 |
| Nitrogen (N) |
≤ 0.25 |
| Carbon (C) |
≤ 0.08 |
| Phosphorus (P) |
≤ 0.04 |
| Sulfur (S) |
≤ 0.02 |
| Iron (Fe) |
Balance |
UNS S32900 Mechanical Properties
| Property |
Value |
| Tensile Strength |
≥ 620 MPa |
| Yield Strength (0.2% Proof) |
≥ 450 MPa |
| Elongation |
≥ 20% |
| Hardness |
≤ 290 HB |
UNS S32900 Physical Properties
| Property |
Value |
| Density |
7.80 g/cm³ |
| Thermal Conductivity |
19 W/m·K |
| Electrical Resistivity |
0.85 µΩ·m |
| Modulus of Elasticity |
200 GPa |
| Melting Range |
1390 – 1440°C |
Types of UNS S32900 Tubes
- Seamless Duplex Tubes
- Welded Duplex Tubes
- ERW Tubes
- EFW Tubes
- Heat Exchanger Tubes
- Hydraulic Tubes
- Instrumentation Tubes
Application
- Marine & Offshore Equipment
- Seawater Desalination Systems
- Chemical & Petrochemical Processing
- Pulp & Paper Industry
- Pressure Piping & Heat Exchangers
- Oil & Gas Refinery Systems
- Structural Components in Corrosive Environments
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