Super Duplex Stainless Steel
At Stellanox Steel, we are a leading supplier of Super Duplex Stainless Steel, offering material solutions that deliver exceptional strength, superior corrosion resistance, and outstanding durability for the world’s most demanding industries.
Our Super Duplex products are engineered to perform reliably in highly aggressive environments — such as offshore oil & gas operations, deepwater pipelines, chemical processing, marine structures, and desalination plants — where ordinary stainless steels fail.
What are Super Duplex Stainless Steel?
Super Duplex Stainless Steel is an enhanced version of standard duplex stainless steel with a higher content of chromium, molybdenum, and nitrogen.
This composition results in exceptionally high strength, superior corrosion resistance (particularly against pitting, crevice corrosion, and stress corrosion cracking), and excellent weldability.
Super Duplex alloys typically deliver twice the yield strength of austenitic grades like 304 and 316, along with the corrosion resistance equivalent to or better than higher-cost nickel alloys, offering an economical alternative for critical applications.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of Super Duplex Stainless Steel
- Ultra-High Strength: Twice the strength of conventional 300-series stainless steels.
- Exceptional Corrosion Resistance: Superior resistance in chloride-rich, acidic, and aggressive chemical environments.
- Excellent Resistance to Stress Corrosion Cracking: Performs even under extreme mechanical and thermal stresses.
- Good Weldability and Fabricability: Can be formed, machined, and welded with standard practices.
- Enhanced Fatigue Resistance: Withstands cyclic loading and mechanical vibration effectively.
- Longer Service Life: Reduced maintenance, repairs, and total cost of ownership over decades.
Super Duplex Stainless Steell Products
Specification Chart –Super Duplex Stainless Steel
| Property | Details |
|---|---|
| Material Family | Super Duplex Stainless Steel |
| Common Grades | UNS S32750 (2507), UNS S32760 (Zeron 100) |
| Manufacturing Standards | ASTM A240, ASTM A790, ASTM A479, EN 10088-2 |
| Forms Available | Plates, Sheets, Coils, Pipes, Tubes, Bars, Fittings, Flanges |
| Thickness Range (Sheets/Plates) | 1.5 mm to 150 mm |
| Diameter Range (Pipes/Tubes/Bars) | 6 mm to 1219 mm (1/8" NB to 48" NB) |
| Length Range | 2 meters to 12 meters (or customized lengths) |
| Surface Finish Options | Hot Rolled, Pickled and Passivated, Polished, Cold Finished |
| Heat Treatment | Solution Annealed and Quenched |
| Testing and Certification | EN 10204 3.1/3.2, NACE MR0175/ISO 15156, ASTM Compliance |
Chemical Composition Chart – Super Duplex Stainless Steel
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | ≤ 0.030 |
| Chromium | Cr | 24.0 – 26.0 |
| Nickel | Ni | 6.0 – 8.0 |
| Molybdenum | Mo | 3.0 – 5.0 |
| Nitrogen | N | 0.24 – 0.32 |
| Manganese | Mn | ≤ 1.2 |
| Silicon | Si | ≤ 0.8 |
| Phosphorus | P | ≤ 0.035 |
| Sulfur | S | ≤ 0.020 |
| Iron | Fe | Balance |
Mechanical Properties Chart –Super Duplex Stainless Steel
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 795 |
| Yield Strength (MPa) | ≥ 550 |
| Elongation (%) | ≥ 15 |
| Hardness (Brinell HB) | ≤ 300 |
| Impact Energy (Charpy @ -46°C) | ≥ 45 Joules |
Equivalent Grades Chart – Super Duplex Stainless Steel
| Standard | Equivalent Grade |
|---|---|
| ASTM | A240 S32750, A790 S32750 |
| UNS | S32750 (2507), S32760 (Zeron 100) |
| EN | 1.4501, 1.4410 |
| DIN | X2CrNiMoCuWN25-7-4 |
| JIS | SUS 329J4L |
Super Duplex Stainless Steel Weight Chart (kg/m²)
| Standard | Grade / Designation | Unit | Weight |
|---|---|---|---|
| ASTM | A240 S32750 (Plate/Sheet) | kg/m² (1 mm thick) | 7.85 |
| ASTM | A790 S32750 (Pipe/Tube) | kg/m (OD 50.8 mm, WT 3.0 mm) | 2.78 |
| UNS | S32750 (2507) | kg/m (Round Bar Ø25 mm) | 3.86 |
| UNS | S32760 (Zeron 100) | kg/m² (Sheet 3 mm) | 23.55 |
| EN | 1.4410 | kg/1000 m (Wire Ø1.0 mm) | 0.62 |
| EN | 1.4501 | kg/m (Pipe Ø25.4 mm, WT 2.0 mm) | 0.95 |
| DIN | X2CrNiMoCuWN25-7-4 | kg/m² (Plate 10 mm) | 78.50 |
| JIS | SUS 329J4L | kg/m (Round Bar Ø50 mm) | 15.42 |
Applications of Super Duplex Stainless Steel in Various Industries
Benefits of Super Duplex Stainless Steel
- Ultra-High Strength for Extreme Loads: Supports lighter, stronger designs.
- Exceptional Corrosion Resistance: Outperforms standard duplex, 316, and many nickel alloys.
- Excellent Weldability: Reliable field installation and fabrication.
- Superior Resistance to Stress Corrosion Cracking: Even under high-pressure, high-chloride conditions.
- Reduced Total Lifecycle Costs: Longer life span and less maintenance compared to other materials.
- Eco-Friendly and Recyclable: Contributes to sustainable industrial development.
Frequently Asked Questions
Super Duplex stainless steels have higher chromium, molybdenum, and nitrogen content, resulting in even better corrosion resistance and strength compared to standard duplex grades.
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