High Standard Stainless Steel With Strict Inspection
Super Duplex Stainless Steel
Complete Technical Data Sheet for Super Duplex Stainless Chemical Composition Mechanical Properties Physical Properties International Standards & Grade Equivalents Key Applications of Super Duplex Stainless Steel Oil and Gas Industry In offshore and onshore oil and gas operations, super duplex is extensively utilized for pipelines, flow lines, risers, and processing equipment. Its superior resistance to […]
Description
Explore Our Super Duplex Stainless Grades
Super Duplex Stainless Steel Plates
Super Duplex Stainless Steel Plates are strong, corrosion-resistant sheets for high-stress, corrosive environments. They provide exceptional strength and durability, with superior resistance to pitting and crevice corrosion.
Super Duplex Stainless Steel Bars/Rods
Super Duplex Stainless Steel Bars and Rods are versatile, high-strength materials used in various industrial applications. They are known for their excellent mechanical properties and corrosion resistance.
Super Duplex Stainless Steel Tubes/Pipes
Super Duplex Stainless Steel Tubes and Pipes are ideal for transporting fluids and gases in highly corrosive environments. They combine strength, durability, and superior resistance to corrosion.
Super Duplex Stainless Steel Coils
Super Duplex Stainless Steel Coils are high-performance, corrosion-resistant materials designed for demanding applications. Combining the best properties of ferritic and austenitic stainless steels, these coils offer exceptional strength, superior resistance to pitting and crevice corrosion, and excellent durability in harsh environments.
Super Duplex Stainless Steel Wire
Super Duplex Stainless Steel wire is a high-performance material engineered for demanding applications that require an exceptional combination of strength and corrosion resistance. Its advanced composition makes it a superior choice for components that must perform reliably in some of the most aggressive industrial environments.
Super Duplex Stainless Steel Forgings
Super Duplex Stainless Steel Forgings are meticulously engineered, custom-shaped components specifically designed to withstand the most demanding, high-stress applications. They deliver an exceptional combination of superior strength and outstanding corrosion resistance, making them an ideal choice for critical industries where reliability and durability are paramount.
Complete Technical Data Sheet for Super Duplex Stainless
| Property | S32750 | S32760 | S32550 | Unit | Notes |
|---|---|---|---|---|---|
| Density | 7.8 | 7.8 | 7.8 | g/cm3 | Similar to 316L |
| Melting Point | 1350-1400 | 1350-1400 | 1350-1400 | °C | Solidus-Liquidus range |
| Thermal Expansion (20-100°C) | 13.0 | 13.0 | 13.0 | μm/m·K | Lower than austenitics (16-17) |
| Thermal Conductivity (20°C) | 17 | 17 | 17 | W/m·K | Higher than austenitics (15) |
| Specific Heat (20°C) | 460 | 460 | 460 | J/kg·K | Standard value |
| Electrical Resistivity (20°C) | 0.80 | 0.80 | 0.80 | μΩ·m | Higher than austenitics (0.72) |
| Magnetic Response | Ferromagnetic | – | Due to ferritic phase | ||
| Critical Pitting Temperature (CPT) | >80 | >80 | >70 | °C | In 6% FeCl₃ solution |
| Grade | UNS | Tensile Strength(MPa / ksi) | Yield Strength(MPa / ksi) | Elongation(%) | Hardness(HB Max) | Impact Energy(J at RT) | Elastic Modulus(GPa) |
|---|---|---|---|---|---|---|---|
| 2507 | S32750 | 730-930 / 106-135 | ≥550 / ≥80 | ≥25 | 290-310 | ≥100 | 200 |
| Z100 | S32760 | 750-950 / 109-138 | ≥550 / ≥80 | ≥25 | 290-310 | ≥100 | 200 |
| F255 | S32550 | 730-930 / 106-135 | ≥550 / ≥80 | ≥20 | 220-290 | ≥100 | 200 |
| For Comparison: 316L | 485-690 / 70-100 | 170-310 / 25-45 | ≥40 | ≤217 | ≥60 | 193 |
| Property | S32750 | S32760 | S32550 | Unit | Notes |
|---|---|---|---|---|---|
| Density | 7.8 | 7.8 | 7.8 | g/cm3 | Similar to 316L |
| Melting Point | 1350-1400 | 1350-1400 | 1350-1400 | °C | Solidus-Liquidus range |
| Thermal Expansion (20-100°C) | 13.0 | 13.0 | 13.0 | μm/m·K | Lower than austenitics (16-17) |
| Thermal Conductivity (20°C) | 17 | 17 | 17 | W/m·K | Higher than austenitics (15) |
| Specific Heat (20°C) | 460 | 460 | 460 | J/kg·K | Standard value |
| Electrical Resistivity (20°C) | 0.80 | 0.80 | 0.80 | μΩ·m | Higher than austenitics (0.72) |
| Magnetic Response | Ferromagnetic | – | Due to ferritic phase | ||
| Critical Pitting Temperature (CPT) | >80 | >80 | >80 | °C | In 6% FeCl₃ solution |
| Standard Organization | Grade Name | Key Properties or Notes |
|---|---|---|
| UNS | S32750 | The most common super duplex grade, known for high strength and excellent corrosion resistance in various environments. |
| UNS | S32760 | Contains added Tungsten (W) and Copper (Cu) for enhanced resistance to hot chloride and sulfuric acid environments. |
| EN | 1.4410 | European standard equivalent to UNS S32750. Often referred to as F53. |
| EN | 1.4501 | European standard equivalent to UNS S32760. Known as F55, with superior pitting and crevice corrosion resistance. |
| ASTM | A182, A240, A479 | Common ASTM specifications covering forgings, plate, sheet, strip, and bars for grade S32750. |
| ASTM | A182, A240, A479 | Common ASTM specifications covering forgings, plate, sheet, strip, and bars for grade S32760. |
| JIS | SUS 329J4L | Japanese standard equivalent for super duplex stainless steel, similar in properties to UNS S32750. |
Why Super Duplex Outperforms All Others？
Unmatched Corrosion Resistance
With a PREN value exceeding 42, super duplex offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-bearing environments. Perfect for seawater, acid processing, and aggressive chemical applications where standard stainless steels fail.
Double the Strength
Yield strength of 550+ MPa—twice that of austenitic 316L stainless steel. This superior strength allows engineers to design thinner, lighter structures without compromising safety or durability, reducing material costs by up to 30% in pressure vessel applications.
Dual-Phase Microstructure
The unique 50/50 austenite-ferrite microstructure combines the best properties of both phases: the toughness and weldability of austenitic steel with the strength and corrosion resistance of ferritic steel, creating an unbeatable combination.
Total Cost Savings
Lower nickel content (6-8% vs 10-14% in austenitics) provides price stability and reduced material costs. Higher strength enables thinner sections, cutting weight by 20-40% and reducing fabrication, transportation, and installation expenses significantly.
Key Applications of Super Duplex Stainless Steel
Oil and Gas Industry
In offshore and onshore oil and gas operations, super duplex is extensively utilized for pipelines, flow lines, risers, and processing equipment. Its superior resistance to chloride-induced stress corrosion cracking and pitting is critical for handling sour gas and crude oil, ensuring operational integrity and longevity.
Chemical Processing and Petrochemical Plants
The material is a preferred choice for manufacturing pressure vessels, heat exchangers, tanks, and piping systems that handle aggressive chemicals and high temperatures. Its robustness against various corrosive media, including acids and chlorides, ensures process safety and reduces maintenance downtime in chemical processing facilities.
Desalination and Marine Applications
Super duplex stainless steel is integral to reverse osmosis desalination plants, particularly in high-pressure pumps and piping systems exposed to concentrated brine. Its excellent performance in marine environments also makes it ideal for shipbuilding, coastal infrastructure, and subsea equipment where saltwater corrosion is a constant threat.
What Our Clients Say
“We’ve been using Super Duplex Stainless for our piping systems, and it has significantly reduced maintenance costs while improving performance.”
Principal Architect
Chemical Plant Manager
“Super Duplex Stainless has been a lifesaver for our offshore platforms. Its corrosion resistance and strength are perfect for harsh marine conditions.”
Sarah Johnson
Offshore Engineer
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Frequently Asked Questions
What is Super Duplex Stainless Steel?
Super Duplex Stainless Steel is a high-performance alloy that combines the best properties of ferritic and austenitic stainless steels. It offers exceptional strength, superior corrosion resistance, and excellent durability, making it ideal for demanding environments such as marine, oil and gas, and chemical processing.
What are the key benefits of Super Duplex Stainless Steel?
High Strength: Twice the strength of standard stainless steels.
Corrosion Resistance: Exceptional resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking.
Durability: Withstands extreme pressures and temperatures.
Cost-Effective: Reduces material usage and maintenance costs due to its strength and longevity.
How does Super Duplex Stainless Steel compare to standard stainless steel?
Super Duplex Stainless Steel offers:
Higher Strength: Twice the yield strength of standard austenitic stainless steels.
Better Corrosion Resistance: Superior performance in chloride-rich and acidic environments.
Cost Savings: Reduced material thickness and maintenance costs due to its strength and durability.
Can Super Duplex Stainless Steel be welded?
Yes, Super Duplex Stainless Steel is weldable, but it requires proper techniques and expertise to maintain its mechanical properties and corrosion resistance. Preheating and post-weld heat treatment may be necessary for certain applications.
What are the common forms of Super Duplex Stainless Steel?
Super Duplex Stainless Steel is available in various forms, including:
Plates
Bars/Rods
Tubes/Pipes
Wire
Forgings
Is Super Duplex Stainless Steel suitable for high-temperature applications?
Super Duplex Stainless Steel performs well in moderate to high temperatures, typically up to 300°C (572°F). However, for extremely high-temperature applications, other specialized alloys may be more suitable.
How does Super Duplex Stainless Steel resist corrosion?
The high chromium, molybdenum, and nitrogen content in Super Duplex Stainless Steel provides excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-rich environments.
What certifications are available for Super Duplex Stainless Steel?
Super Duplex Stainless Steel typically complies with standards such as ASTM A240, ASTM A789, UNS S32750, and UNS S32760, ensuring its quality and suitability for various industrial applications.
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