ASTM A789 UNS S32750 Super Duplex Steel Tube , For Surviving Seawater Application
ASTM A789 S32750 duplex stainless steel tubes are a premium-grade solution engineered for industries requiring exceptional corrosion resistance,high strength, and durability. Combining the best properties of austenitic and ferritic stainless steels, Duplex 2507 (UNS S32750) is a hyper-duplex alloy ideal for harsh environments such as offshore oil & gas, chemical processing, and marine applications.
Chemical Composition of A789 UNS S32750 Tube
| ELEMENT | CONTENT(%) |
| Cr | 24.0-26.0 |
| Ni | 6.0-8.0 |
| Mo | 3.0-4.0 |
| N | 0.24-0.32 |
| Mn | ≤1.2 |
| Si | ≤0.8 |
| Cu | 0.5-1.0 |
| PREN | ≥40(Cr+3.3Mo+6N) |
PREN (Pitting Resistance Equivalent Number) ensures outstanding resistance to localized corrosion.
Mechanical Properties of A789 UNS S32750 Tube
| PROPERTY | VALUE |
| Tensile Strength | ≥ 800 MPa (116 ksi) |
| Yield Strength (0.2% offset) | ≥ 550 MPa (80 ksi) |
| Elongation (% in 50 mm) | ≥ 15% |
| Hardness (Rockwell C) | ≤ 32 HRC |
| Impact Toughness (Charpy V) | ≥ 100 J (-50°C) |
Combines high strength with excellent toughness, even at sub-zero temperatures.
Physical Properties
| Property | Value |
| Density | 7.8 g/cm³ |
| Melting Range | 1325–1440°C (2420–2625°F) |
| Thermal Expansion (20–100°C) | 13.0 ×10⁻⁶/°C |
| Thermal Conductivity | 15 W/m·K |
| Electrical Resistivity | 80 μΩ·cm |
Optimized for thermal stability and energy efficiency in extreme conditions.
Key Advantages
- Resists pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-rich environments (e.g., seawater, acidic media).
✅ Double the Strength of 316L
- High yield strength reduces material thickness and weight, lowering installation and lifecycle costs.
✅ Cost-Effective Longevity
- Outperforms austenitic steels in aggressive settings, minimizing maintenance and replacement needs.
✅ Weldability & Fabrication
- Compatible with standard welding techniques (TIG, MIG) and cold forming processes.
Application Fields
1. Oil & Gas Industry
- Subsea pipelines, downhole tubing, and risers.
- Process equipment in sour gas environments (H₂S/CO₂).
2. Chemical & Petrochemical
- Heat exchangers, reactors, and acid storage tanks.
3. Marine Engineering
- Seawater desalination plants, shipbuilding components.
4. Power Generation
- Flue gas scrubbers, condensers in thermal plants.
5. Pulp & Paper
- Bleaching equipment and corrosive chemical handling.
Certifications & Compliance
- ASTM A789/A789M: Standard specification for seamless and welded ferritic/austenitic stainless steel tubing.
- NACE MR0175/ISO 15156: Certified for sour service environments.
- EN 10204 3.1/3.2: Material test certificates available.
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