Super Duplex Stainless Steel Round Bar
At Stellanox Steel, we manufacture and supply premium-grade Super Duplex Stainless Steel Round Bars that combine exceptional strength, superior corrosion resistance, and outstanding performance for extreme applications.
Our Super Duplex round bars are trusted across industries such as offshore oil & gas, marine engineering, chemical processing, desalination, and power generation — wherever high mechanical strength and corrosion protection are critical for system reliability and longevity.
What are Super Duplex Stainless Steel Round Bar?
Super Duplex Stainless Steel Round Bars are solid cylindrical bars made from super duplex alloys like UNS S32750 (2507) and S32760 (Zeron 100).
Characterized by a 50-50 austenitic-ferritic microstructure, these bars offer double the strength of standard austenitic grades (such as 304/316) while providing excellent resistance to pitting, crevice corrosion, erosion, and chloride-induced stress corrosion cracking.
They are used for critical components such as shafts, fasteners, valves, pump parts, and structural frameworks where mechanical performance and corrosion resistance must be guaranteed.
| Products |
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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 Round Bar
- Ultra-High Mechanical Strength: Twice the yield strength of standard stainless steels.
- Exceptional Corrosion Resistance: Superior performance in seawater, sour gas, and acidic environments.
- Excellent Machinability and Weldability: Suitable for forging, machining, and field welding operations.
- Outstanding Resistance to Fatigue and Stress Corrosion Cracking: Ideal for dynamic load-bearing applications.
- Superior Low-Temperature Toughness: Performs even at cryogenic temperatures.
- Cost-Effective Material Choice: Delivers long-term savings by minimizing maintenance and replacement needs.
Super Duplex Stainless Steel Round Bar Products
Super Duplex Stainless Steel Sheet
Super Duplex Stainless Steel Plate
Super Duplex Stainless Steel Pipe
Super Duplex Stainless Steel Tube
Super Duplex Stainless Steel Bar
Specification Chart –Super Duplex Stainless Steel Round Bar
| Property | Details |
|---|---|
| Product | Super Duplex Stainless Steel Round Bar |
| Common Grades | UNS S32750 (2507), UNS S32760 (Zeron 100) |
| Manufacturing Standards | ASTM A276, ASTM A479, EN 10088-3, JIS G4303 |
| Diameter Range | 5 mm to 600 mm |
| Length Range | 3 meters, 6 meters, 9 meters, 12 meters (cut-to-length available) |
| Surface Finish Options | Hot Rolled, Cold Drawn, Peeled, Centerless Ground, Polished |
| Condition Options | Solution Annealed, Annealed & Pickled, Bright Bar |
| Tolerances | h9, h10, h11 or as per customer specification |
| Testing and Certification | EN 10204 3.1/3.2, Ultrasonic Testing (UT), PMI Test, NACE MR0175/ISO 15156 Compliance |
Chemical Composition Chart – Super Duplex Stainless Steel Round Bar
| 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 Round Bar
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 795 |
| Yield Strength (0.2% Proof, MPa) | ≥ 550 |
| Elongation (%) | ≥ 15 |
| Hardness (Brinell HB) | ≤ 300 |
| Impact Energy (Charpy @ -46°C) | ≥ 45 Joules |
Equivalent Grades Chart –Super Duplex Stainless Steel Round Bar
| Standard | Equivalent Grade |
|---|---|
| ASTM | A276 S32750, A276 S32760 |
| UNS | S32750 (2507), S32760 (Zeron 100) |
| EN | 1.4501, 1.4410 |
| DIN | X2CrNiMoCuWN25-7-4 |
| JIS | SUS 329J4L |
Super Duplex Stainless Steel Round Bar Weight Chart (kg/m²)
| Diameter (mm) | Weight per Meter (kg) | Weight per 3 m (kg) | Weight per 6 m (kg) |
|---|---|---|---|
| 10 | 0.62 | 1.86 | 3.72 |
| 12 | 0.89 | 2.67 | 5.34 |
| 16 | 1.58 | 4.74 | 9.48 |
| 20 | 2.47 | 7.41 | 14.82 |
| 25 | 3.86 | 11.58 | 23.16 |
| 30 | 5.56 | 16.68 | 33.36 |
| 40 | 9.87 | 29.61 | 59.22 |
| 50 | 15.42 | 46.26 | 92.52 |
| 60 | 22.21 | 66.63 | 133.26 |
Applications of Super Duplex Stainless Steel Round Bar in Various Industries
Stellanox Steel’s Carbon Steel products are valued for their strength, machinability, and cost-effectiveness across multiple sectors:
Oil And Gas Industry
Marine Industry
Building And Structural Steel
Power and Energy
Aerospace
Defence
Benefits of Super Duplex Stainless Steel Round Bar
- Extreme Load Carrying Capacity: Enables smaller diameter bars to perform at higher loads.
- Superior Resistance to Seawater and Chloride Attack: Perfect for offshore and marine industries.
- Excellent Machining and Forging Performance: Easily fabricated into complex shapes.
- Long-Term Durability: Reduces operational costs with minimal downtime and maintenance.
- Corrosion Resistance in Sour Service: Suitable for applications involving hydrogen sulfide (H₂S).
- Eco-Friendly Material: Fully recyclable, contributing to sustainability.
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
What makes Super Duplex Round Bars stronger than 316 stainless steel bars?
Super Duplex has twice the yield strength and much higher resistance to pitting and stress corrosion compared to 316, especially in chloride-rich environments.
Are Super Duplex round bars magnetic?
Yes, due to the ferritic phase, Super Duplex round bars are partially magnetic.
Can Super Duplex round bars be used for machining complex parts?
Yes. Although slightly harder to machine than austenitic steels, they can be machined efficiently with correct tooling and parameters.
What surface finishes are available for Super Duplex round bars?
Options include hot-rolled, cold-drawn, peeled, polished, and centerless ground finishes.
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2025 Stellanox Steel |