UNS S32760 Super Duplex Stainless Steel Seamless Pipe SCH40S SCH80S In 6m Length

UNS S32760 Super Duplex Stainless Steel Seamless Pipe SCH40S SCH80S in 6m Length

Products Specification

S32760 (UNS S32760), often marketed under the trademark SAF 2507®, is a super duplex stainless steel grade renowned for its exceptional strength and corrosion resistance. Pipes made from this alloy are widely used in demanding environments where standard stainless steels or even standard duplex grades (like 2205) are inadequate.

Key Features & Composition

• High Alloy Content: Elevated chromium (24–26%), nickel (6–8%), molybdenum (3–4%), and nitrogen (0.2–0.3%) provide outstanding resistance to localized and uniform corrosion.

• Dual-Phase Structure: Balanced microstructure of ~50% austenite and 50% ferrite, combining the best properties of both phases.

• Exceptional Strength: Yield strength (~550 MPa) is roughly double that of 316L austenitic steel, allowing thinner pipe walls and weight savings.

• PREN ≥ 40: High Pitting Resistance Equivalent Number ensures superior performance in chloride-rich environments (seawater, chemical processing).

• Excellent Toughness & Fatigue Resistance: Suitable for high-pressure/vibration applications.,

Key Properties for Pipes

• Corrosion Resistance:
  → Resists pitting, crevice corrosion, and stress corrosion cracking (SCC) in chlorides.
  → Performs well in acidic/sour (H₂S-containing) environments, brackish water, and oxidizing acids.

• Mechanical Performance:
  → High tensile/yield strength reduces wall thickness vs. austenitic steels.
  → Good impact toughness down to -40°C.

• Weldability: Requires controlled procedures (e.g., low heat input, matching filler metals like ER2594) but can be reliably welded.

Common Applications

S32760 pipes are ideal for:

1. Offshore Oil & Gas: Subsea pipelines, risers, umbilicals, seawater cooling systems.

2. Chemical & Petrochemical: Aggressive acid transport, heat exchangers, reactors.

3. Desalination & Marine: Seawater intake/discharge pipes, brine heaters.

4. Pollution Control: Flue gas desulfurization (FGD) scrubbers.

5. High-Pressure Systems: Hydraulic lines, process piping.

Manufacturing Standards

Pipes comply with international standards:

• ASTM A790/A928: Seamless/welded duplex stainless steel pipes.

• EN 10216-5: Seamless tubes for pressure purposes.

• NACE MR0175/ISO 15156: Approved for sour service.

Considerations

• Cost: Higher initial cost than 316L or 2205, but lifecycle cost benefits in harsh settings.

• Thermal Limits: Avoid prolonged exposure above 300°C (risk of embrittlement).

• Fabrication: Requires specialized welding protocols and machining tools.

Summary

S32760 duplex stainless steel pipes deliver unmatched corrosion resistance and mechanical strength for critical applications in aggressive, high-pressure, or subsea environments. Their robustness and longevity make them a cost-effective solution despite higher material costs, particularly where safety and reliability are paramount.

For specific project needs (e.g., size range, pressure ratings, certifications), consulting technical datasheets or manufacturers is recommended.

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