ASTM A789 UNS S32304 Duplex Stainless Steel Tube
ASTM A789 UNS S32304 Duplex Stainless Steel Tubes are designed for applications requiring high mechanical strength, excellent corrosion resistance, and superior performance in chloride-containing environments. UNS S32304 is a cost-effective duplex stainless steel grade offering nearly double the strength of austenitic stainless steels while maintaining good resistance to pitting, crevice corrosion, and stress corrosion cracking.
These tubes are ideal for chemical processing, marine structures, pulp & paper industries, and heat exchanger systems that demand long-term reliability with reduced maintenance.
Key Features
- High strength with excellent durability
- Superior resistance to chloride-induced corrosion
- Good stress corrosion cracking resistance
- Ideal for medium to highly corrosive environments
- Cost-effective alternative to higher duplex grades
- Excellent thermal conductivity and low thermal expansion
Equivalent Grade
| Standard |
Grade |
| UNS |
S32304 |
| EN / DIN |
1.4362 |
| WNR |
1.4362 |
| ISO |
2304 |
| AFNOR |
Z3 CrNi 23.4 |
ASTM A789 UNS S32304 Chemical Composition
| Element |
Percentage (%) |
| Chromium (Cr) |
21.5 – 24.5 |
| Nickel (Ni) |
3.0 – 5.5 |
| Molybdenum (Mo) |
≤ 0.60 |
| Manganese (Mn) |
≤ 2.50 |
| Silicon (Si) |
≤ 1.00 |
| Nitrogen (N) |
0.05 – 0.20 |
| Carbon (C) |
≤ 0.03 |
| Phosphorus (P) |
≤ 0.04 |
| Sulfur (S) |
≤ 0.02 |
| Iron (Fe) |
Balance |
ASTM A789 UNS S32304 Mechanical Properties
| Property |
Value |
| Tensile Strength |
≥ 600 MPa |
| Yield Strength (0.2% Proof) |
≥ 400 MPa |
| Elongation |
≥ 25% |
| Hardness |
≤ 290 HB |
Physical Properties
| Property |
Value |
| Density |
7.80 g/cm³ |
| Thermal Conductivity |
18 W/m·K |
| Electrical Resistivity |
0.80 µΩ·m |
| Modulus of Elasticity |
200 GPa |
| Melting Range |
1350 – 1450°C |
Types Grade UNS S32304 Tubes
- Seamless Duplex Tubes
- Welded Duplex Tubes
- ERW Tubes
- EFW Tubes
- Heat Exchanger Tubes
- Hydraulic & Instrumentation Tubes
Application
- Marine & Offshore Systems
- Heat Exchangers & Condensers
- Chemical Processing Equipment
- Pulp & Paper Industries
- Oil & Gas Processing
- Desalination Plants
- Structural & Pressure Equipment
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