ASTM A789 UNS S31803 Duplex Stainless Steel Tube
ASTM A789 UNS S31803 Duplex Stainless Steel Tubes are widely used for demanding applications requiring high strength, superior corrosion resistance, and excellent stress corrosion cracking resistance. As a duplex stainless steel, UNS S31803 offers a balanced microstructure of austenite and ferrite, resulting in enhanced toughness, durability, and chloride resistance. These tubes conform to the ASTM A789 standard for seamless and welded duplex stainless steel tubes used in chemical, oil & gas, and marine industries.
Key Features
- High tensile and yield strength
- Excellent resistance to pitting and crevice corrosion
- Superior resistance to stress corrosion cracking (SCC)
- Good weldability and formability
- Excellent performance in chloride-rich and acidic environments
- Suitable for high-pressure and elevated-temperature applications
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S31803 |
| EN | 1.4462 |
| ASTM | A789 / A790 |
| WNR | 1.4462 |
| Trade Name | Duplex 2205 |
Available Sizes
- Outside Diameter (OD): 6 mm to 508 mm
- Wall Thickness: 0.5 mm to 50 mm
- Tube Length: Up to 12 meters (Custom lengths available)
- Type: Seamless, Welded, ERW
ASTM A789 UNS S31803 Chemical Composition
| Element | Percentage |
|---|---|
| Chromium (Cr) | 22.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 3.0 – 3.5 |
| Nitrogen (N) | 0.14 – 0.20 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Iron (Fe) | Balance |
ASTM A789 UNS S31803 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa (min) |
| Yield Strength 0.2% | 450 MPa (min) |
| Elongation | 25% (min) |
| Hardness | 290 HB max |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | 1350 – 1450°C |
| Elastic Modulus | 200 GPa |
| Thermal Conductivity | 19 W/m·K |
| Electrical Resistivity | 0.85 µΩ·m |
Type of Grade UNS S31803 Duplex Tubes
- Duplex Seamless Tubes
- Duplex Welded Tubes
- ERW Tubes
- Hydraulic & Instrumentation Tubes
- Heat Exchanger Tubes
- Boiler & Superheater Tubes
Applications
- Oil & Gas Processing
- Marine Engineering
- Desalination Plants
- Chemical Processing
- Petrochemical Industries
- Heat Exchangers & Condensers
- Pulp & Paper Industry
- Structural Applications in Corrosive Environments
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