ASTM A789 UNS S32906 Duplex Stainless Steel Tubes
ASTM A789 UNS S32906 is a high-performance duplex stainless steel grade engineered to offer exceptional corrosion resistance, superior mechanical strength, and excellent durability in aggressive environments. With a balanced ferritic-austenitic microstructure, UNS S32906 provides higher strength and improved resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking compared to standard stainless steels.
UNS S32906 Tubes under ASTM A789 are widely used in chemical processing, desalination plants, offshore structures, and high-pressure systems due to their outstanding metallurgical stability and long service life. This grade is ideal for environments exposed to seawater, acidic chemicals, and high mechanical stress.
Key Features
- Excellent pitting and crevice corrosion resistance
- High yield and tensile strength due to duplex structure
- Superior resistance to chloride stress corrosion cracking
- Outstanding performance in marine and offshore conditions
- Good weldability and fabrication capabilities
- Long-lasting durability in high-pressure applications
Equivalent Grades of UNS S32906
| Standard | Equivalent Grade |
|---|---|
| UNS | S32906 |
| EN | 1.4929 (Nearest comparable grade) |
| WNR | Available on request |
| Trade Names | Duplex Stainless Variant |
Available Sizes
| Parameter | Range |
|---|---|
| Outside Diameter | 6 mm to 219 mm |
| Wall Thickness | 0.5 mm to 20 mm |
| Length | Up to 12 meters |
| Customized Sizes | Available on request |
ASTM A789 UNS S32906 Chemical Composition
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 1.5 – 2.5 |
| Nitrogen (N) | 0.20 – 0.35 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.030 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
| Iron (Fe) | Balance |
Grade UNS S32906 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 700 MPa |
| Yield Strength | ≥ 480 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 290 HBW |
Grade UNS S32906 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | ~15 W/m·K |
| Electrical Resistivity | 0.80 µΩ·m |
| Melting Range | 1340–1440°C |
Types of ASTM A789 UNS S32906 Tubes
- Seamless Tubes
- Welded Tubes
- ERW Tubes
- EFW Tubes
- Heat Exchanger Tubes
- Hydraulic Tubes
- Instrumentation Tubes
- U-Bend Tubes
- Coiled Tubes
Applications
- Offshore Oil & Gas Platforms
- Marine and Shipbuilding Systems
- Desalination and Water Treatment Plants
- Chemical Processing Equipment
- Heat Exchangers and Condensers
- Petrochemical Plants
- High-pressure Piping Systems
- Pulp and Paper Industry
- Power Generation and Boiler Systems
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