Super Duplex Steel UNS S32760 Flanges

What are Super Duplex Steel UNS S32760 Flanges?

Super Duplex Steel UNS S32760 flanges are high-performance piping components used to:

• Connect pipelines and equipment: Provide strong and leak-proof joints
• Handle extreme conditions: Suitable for high-pressure and high-temperature systems
• Resist severe corrosion: Ideal for chloride-rich and aggressive environments
• Enhance system performance: Ensure long-lasting and reliable operation

These flanges are made from super duplex stainless steel with a balanced austenitic-ferritic structure and enhanced alloy content, offering superior strength and corrosion resistance compared to standard duplex grades.

Composition Highlights (Typical)

Super Duplex Steel UNS S32760:

• Chromium (Cr): 24 – 26% → Excellent corrosion resistance
• Nickel (Ni): 6 – 8% → Improves toughness
• Molybdenum (Mo): 3 – 4% → Enhances pitting resistance
• Tungsten (W): 0.5 – 1.0% → Improves strength and corrosion resistance
• Copper (Cu): 0.5 – 1.0% → Enhances resistance to acids
• Nitrogen (N): 0.20 – 0.30% → Increases strength
• Carbon (C): ≤ 0.03%
• Iron (Fe): Balance

Key Advantage: Addition of tungsten and copper provides superior resistance to localized corrosion and improves performance in aggressive chemical environments.

Key Features of Super Duplex Steel UNS S32760 Flanges

• Ultra-high strength: Higher than both duplex and standard stainless steels
• Exceptional corrosion resistance: Suitable for extreme marine and chemical environments
• Outstanding resistance to pitting and crevice corrosion
• Excellent resistance to chloride stress corrosion cracking
• Enhanced resistance to acidic environments: Due to copper content
• High fatigue strength: Performs well under cyclic loads
• Long service life: Reduced maintenance and downtime

Mechanical Properties

Super Duplex Steel S32760:

• Tensile Strength: ~750 – 950 MPa → High load-bearing capability
• Yield Strength: ≥ 550 MPa → Excellent resistance to deformation
• Elongation: ≥ 20% → Good ductility

These properties make S32760 ideal for critical and high-pressure applications.

Physical Properties

• Density: ~7.8 g/cm³ → Strong yet lightweight
• Melting Range: 1350 – 1450°C → Suitable for elevated temperatures
• Modulus of Elasticity: ~200 GPa → High stiffness
• Thermal Conductivity: ~14 W/m•K → Moderate heat transfer
• Coefficient of Expansion: ~13 µm/m°C → Low thermal expansion

Corrosion Resistance

Super Duplex Steel S32760 flanges offer exceptional resistance to:

• Seawater and marine environments
• Pitting and crevice corrosion
• Chloride stress corrosion cracking
• Acidic environments: Including sulfuric and organic acids
• Oxidizing and reducing conditions

This makes S32760 one of the most corrosion-resistant stainless steels available.

Heat Treatment

• Solution Annealing: 1020 – 1100°C
• Rapid cooling (water quenching)

This ensures proper phase balance and optimal corrosion resistance.

Weldability

Super Duplex S32760 flanges can be welded using:

• TIG (GTAW) → High-quality precision welding
• MIG (GMAW) → Efficient production welding
• SMAW → Suitable for industrial applications

Recommendations:

• Use controlled heat input
• Use matching filler materials
• Maintain phase balance to avoid brittleness

Machinability

• Moderate machinability due to high strength
• Use carbide cutting tools
• Maintain controlled cutting speeds
• Apply sufficient coolant to reduce heat buildup

Standards & Specifications

• ASTM A182
• ASME SA182
• ANSI B16.5
• ANSI B16.47
• ASTM A240

These standards ensure international quality and compatibility.

Available Types of Super Duplex Steel Flanges

• Weld Neck Flanges → High-pressure applications
• Slip-On Flanges → Easy installation
• Blind Flanges → Pipe closure
• Socket Weld Flanges → Small pipelines
• Threaded Flanges → Non-weld systems
• Lap Joint Flanges → Easy maintenance
• Orifice Flanges → Flow measurement

Sizes & Specifications

• Size Range: ½ inch to 48 inches
• Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#
• Type: Forged

Surface Finish:

• Pickled → Clean and corrosion-resistant
• Polished → Smooth finish
• Machined → Precision engineered

(Custom sizes available as per requirement)

Applications of Super Duplex Steel UNS S32760 Flanges

• Oil & Gas Industry: Used in offshore platforms, subsea pipelines, and high-pressure systems.
• Marine Industry: Ideal for seawater handling and shipbuilding applications.
• Chemical Processing: Handles aggressive chemicals and acidic environments.
• Desalination Plants: Used in high-salinity water systems.
• Power Generation: Applied in heat exchangers and cooling systems.

Quality Testing & Inspection

All flanges undergo strict quality checks:

• Chemical composition testing → Ensures correct grade
• Mechanical testing → Verifies strength and durability
• Dimensional inspection → Confirms accuracy
• Surface examination → Detects defects
• PMI testing → Confirms material identity

Mill Test Certificates (MTC) and third-party inspection reports are provided.

Packaging & Delivery

• Export-quality wooden packaging
• Protective wrapping
• Proper labeling and traceability
• Safe and timely global shipping

Why Choose Virami Steel Hub?

• Trusted super duplex flange manufacturer in Mumbai
• Large stock availability
• Competitive pricing
• Custom manufacturing solutions
• Compliance with international standards
• Strong export network
• Dedicated customer support

Conclusion

Super Duplex Steel UNS S32760 Flanges are engineered for the most extreme service conditions, offering superior strength, exceptional corrosion resistance, and outstanding durability. Their enhanced alloy composition makes them ideal for critical applications in oil & gas, marine, chemical processing, and desalination industries.

Virami Steel Hub provides high-quality Super Duplex S32760 flanges that meet global standards, ensuring long-term reliability, safety, and performance.