Super Duplex Pipes and Tubes Supplier in the UAE
Super Duplex stainless steel pipes and tubes are built on a balanced ferritic-austenitic structure with roughly 25% chromium, elevated molybdenum, and added nitrogen. The result is a material with a Pitting Resistance Equivalent Number (PREN) above 40, yield strength around twice that of SS316, and dependable performance in hot, chloride-saturated conditions where both austenitic grades and standard Duplex 2205 reach their limits. For UAE projects handling raw seawater, sour hydrocarbons, or concentrated brine, Super Duplex is often the grade specified for demanding piping systems.
As a trusted Super Duplex steel pipes supplier in the UAE, Riyaarth Overseas manufactures, stocks, supplies, and exports Super Duplex Stainless Steel Pipes and Tubes, serving procurement managers, EPC contractors, fabricators, and importers across Dubai, Abu Dhabi, Sharjah, and the wider GCC. Our core offering includes Super Duplex 2507 (UNS S32750) and UNS S32760 (Zeron 100 type) in seamless and welded construction, manufactured to ASTM A790 for pipes, ASTM A789 for tubes, and ASTM A928 for welded pipe requirements.
What we supply:
- Seamless Super Duplex Pipes to ASTM A790 — for high-pressure offshore lines, injection systems, and critical process piping
- Welded Super Duplex Pipes to ASTM A790 / A928 — for larger bore seawater and utility piping
- Super Duplex Tubes to ASTM A789 — for heat exchangers, condensers, and instrumentation tubing
- Super Duplex U-Bend Tubes — for shell-and-tube exchanger bundles in seawater and brine duty
Typical end uses in the UAE include offshore oil and gas platforms, seawater injection and firewater systems, SWRO desalination plants, subsea flowlines, and chemical processing units — anywhere a project needs high mechanical strength combined with proven resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.
For a current Super Duplex Pipe price in the UAE, share your grade, size, schedule, and quantity with Riyaarth Overseas, and our team will send a project-specific quotation with delivery terms to your UAE location.
Specifications of Super Duplex Steel Pipes and Tubes
| Parameter | Specification |
|---|---|
| Pipe Standard | ASTM A790 / ASME SA790 |
| Tube Standard | ASTM A789 / ASME SA789 |
| Welded Pipe Standard | ASTM A928 |
| Grades | Super Duplex 2507 (UNS S32750), UNS S32760 (Zeron 100 type), UNS S32550 |
| PREN | ≥ 40 (both S32750 and S32760) |
| Type | Seamless, Welded (ERW / EFW), U-Bend |
| Outer Diameter | 6 mm to 914 mm (1/8" to 36") |
| Wall Thickness | Sch 5S up to Sch XXS |
| Length | Single random, double random, cut-to-length per drawing |
| Form | Round pipes and tubes; fittings and fabricated spools on request |
| End Finish | Plain, bevelled, or threaded ends |
| Surface Finish | Solution annealed and pickled; polished finish available on request |
Super Duplex Pipe Schedule Chart
| NPS | OD (mm) | Sch 10S (mm) | Sch 40S (mm) | Sch 80S (mm) | Sch XS (mm) |
|---|---|---|---|---|---|
| 1/2" | 21.3 | 2.11 | 2.77 | 3.73 | 4.78 |
| 1" | 33.4 | 2.77 | 3.38 | 4.55 | 6.35 |
| 2" | 60.3 | 2.77 | 3.91 | 5.54 | 7.62 |
| 4" | 114.3 | 3.05 | 6.02 | 8.56 | 11.13 |
| 6" | 168.3 | 3.40 | 7.11 | 10.97 | 14.27 |
| 8" | 219.1 | 3.76 | 8.18 | 12.70 | 15.09 |
| 10" | 273.0 | 4.19 | 9.27 | 12.70 | 18.26 |
| 12" | 323.9 | 4.57 | 9.53 | 14.27 | 17.48 |
Wall thickness availability depends on the mill run and your project specification. Send us the exact NPS, schedule, and length requirement and we will confirm stock or production lead time along with pricing.
Mechanical Properties
| Grade | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| Super Duplex 2507 (S32750) | 795 MPa | 550 MPa | 15% | 310 HB |
| Super Duplex S32760 | 750 MPa | 550 MPa | 25% | 270 HB |
| Duplex 2205 (S32205)* | 655 MPa | 450 MPa | 25% | 293 HB |
Duplex 2205 shown for comparison — Super Duplex grades deliver roughly 20–25% higher minimum yield strength, which allows thinner walls and lighter piping systems at the same design pressure.
Chemical Composition
| Element | UNS S32750 (2507) | UNS S32760 | UNS S32205 (for reference) |
|---|---|---|---|
| Carbon (C) | 0.030 max | 0.030 max | 0.030 max |
| Chromium (Cr) | 24.0–26.0% | 24.0–26.0% | 22.0–23.0% |
| Nickel (Ni) | 6.0–8.0% | 6.0–8.0% | 4.5–6.5% |
| Molybdenum (Mo) | 3.0–5.0% | 3.0–4.0% | 3.0–3.5% |
| Nitrogen (N) | 0.24–0.32% | 0.20–0.30% | 0.14–0.20% |
| Copper (Cu) | 0.5 max | 0.5–1.0% | — |
| Tungsten (W) | — | 0.5–1.0% | — |
| Manganese (Mn) | 1.2 max | 1.0 max | 2.0 max |
| Phosphorus (P) | 0.035 max | 0.030 max | 0.030 max |
| Sulphur (S) | 0.020 max | 0.010 max | 0.020 max |
| Silicon (Si) | 0.8 max | 1.0 max | 1.0 max |
The higher chromium, molybdenum, and nitrogen levels are what push the PREN of Super Duplex above 40 — the threshold generally accepted for reliable service in ambient seawater. S32760 additionally contains copper and tungsten, which improve resistance in acidic and sour environments.
Super Duplex Grades We Supply to the UAE
Super Duplex 2507 (UNS S32750)
The most commonly specified Super Duplex grade for UAE offshore and desalination work. With a PREN of at least 41, it handles hot seawater, brine reject lines, and high-pressure injection service where Duplex 2205 would risk pitting. Available from stock in seamless ASTM A790 pipe and A789 tube.
Super Duplex S32760 (Zeron 100 Type)
A copper- and tungsten-alloyed Super Duplex developed for the harshest seawater and sour service conditions. Frequently called up on ADNOC and offshore EPC specifications for subsea piping, wellhead components, and firewater ring mains. Supplied with full traceability against project material requisitions.
UNS S32550 (25Cr Super Duplex Type)
A copper-bearing 25% chromium grade suited to sulphuric and phosphoric acid environments alongside seawater duty. A practical option for chemical processing and fertiliser plants in the region that face mixed acid-plus-chloride exposure.
When Duplex 2205 Is Enough
Not every line needs Super Duplex. For moderate-temperature seawater and general process piping, Duplex 2205 remains the cost-effective choice — and we stock it as well. Our team can help you compare both grades against your design temperature, chloride level, and pressure rating before you commit to a purchase order.
Applications of Super Duplex Pipes in the UAE
The UAE’s project environment — offshore fields in the Arabian Gulf, some of the world’s largest desalination capacity, and major petrochemical hubs — routinely pushes piping materials to their corrosion limits. Super Duplex pipes and tubes are specified across:
- Offshore Oil & Gas: Seawater injection lines, production piping, risers, and topside process systems on Gulf platforms
- Subsea Systems: Flowlines, umbilical tubing, and manifold piping exposed to full seawater immersion
- Firewater Systems: Deluge and ring main piping on offshore and coastal facilities, where stagnant seawater is highly aggressive
- Desalination (SWRO): High-pressure feed and brine reject piping, energy recovery loops, and pump manifolds
- Refineries & Petrochemicals: Sour service piping, amine units, and heat exchanger tubing in chloride-bearing streams
- Marine & Ports: Seawater cooling circuits, ballast piping, and dockside utility systems
- Power Generation: Condenser tubing and cooling water piping drawing directly from the Gulf
- Chemical Processing: Acid handling and mixed-service lines where both strength and corrosion resistance are mandatory
- EPC Fabrication: Spools, skids, and modular assemblies delivered to fabricator yards in Dubai, Abu Dhabi, and Sharjah
Because Gulf seawater is warmer and more saline than most open oceans, UAE engineers frequently step up from 2205 to Super Duplex 2507 for any line in continuous seawater contact — the higher upfront cost is recovered through longer service life and fewer shutdowns for pipe replacement.
Quality Assurance
Every Super Duplex consignment from Riyaarth Overseas is verified against the governing standard and your project specification before it leaves our facility. Our quality controls cover:
- Heat-wise traceability with EN 10204 Type 3.1 mill test certificates (3.2 with third-party inspection on request)
- Full dimensional checks on outside diameter, wall thickness, ovality, and length
- Tensile, hardness, and Charpy impact testing where the specification demands it
- Ferrite content verification and microstructure checks to confirm the correct austenite-ferrite balance
- Positive Material Identification (PMI) on request for grade confirmation
- Hydrostatic testing plus NDT (ultrasonic, radiographic, dye penetrant) per project ITP
- ASTM A923 testing to screen for detrimental intermetallic phases in Super Duplex material
- Intergranular and pitting corrosion testing (e.g., ASTM G48) for critical chloride service
FAQs
Products
Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry