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JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect.
GB13296-1991 GB14975-2002 GB14976-2002,ect.
Size:
ND5 - DN400
Length:
6m length or cutting any length as request
Applications:
fluid and gas transport, structure , boiler, heat exchanger, super heater
verview of S32760 Duplex Stainless Steel Pipe
S32760, a super duplex stainless steel grade, combines austenitic and ferritic microstructures to deliver unparalleled performance in aggressive environments. Here’s a distinct perspective on its characteristics and applications:
Microstructural Design and Alloy Chemistry
The alloy’s microstructure is a 50:50 balance of austenite and ferrite phases, stabilized by its unique composition:
Chromium (25%): Forms a passive oxide layer for corrosion resistance.
Nickel (7%): Enhances ductility and resistance to reducing acids.
Nitrogen (0.25%): Boosts strength and suppresses intergranular corrosion. This design gives S32760 a PREN (Pitting Resistance Equivalent Number) exceeding 40, far surpassing standard stainless steels.
Mechanical Performance Under Stress
Yield Strength: 550–650 MPa (80–94 ksi), ideal for high-pressure systems.
Impact Toughness: ≥100 J at -40°C, ensuring reliability in cryogenic or offshore conditions.
Creep Resistance: Maintains structural integrity at temperatures up to 350°C, outperforming 2205 duplex in high-heat applications. Its dual-phase structure minimizes ductile-brittle transition, critical for fatigue-prone installations.
Corrosion Resistance Mechanisms
Chloride Environments: Resists pitting in seawater (up to 3.5% salinity) and brine systems, making it suitable for subsea pipelines.
Sour Gas Service: Withstands H₂S and CO₂ in oil wells (up to 100,000 ppm Cl⁻), meeting NACE MR0175 standards.
Acid Resistance: Tolerates sulfuric and phosphoric acids at moderate concentrations, critical in fertilizer production.
Galvanic Compatibility: Low electrode potential reduces corrosion when mated with carbon steel in cathodic protection systems.
Industry-Specific Applications
Offshore Oil & Gas:
Subsea flowlines and risers in deepwater fields (e.g., Gulf of Mexico, North Sea).
Chemical injection lines for corrosion inhibitor delivery.
Marine Desalination:
Heat exchangers in reverse osmosis plants handling seawater at high temperatures.
Pharmaceutical Manufacturing:
Reactors for high-purity processes involving chlorinated solvents or acids.
Wastewater Treatment:
Sludge processing equipment exposed to chloride and sulfur compounds.
Fabrication and Installation Advantages
Welding Flexibility: Gas Tungsten Arc Welding (GTAW) or Shielded Metal Arc Welding (SMAW) with ER2594 filler metal.
Formability: Can be cold-worked for pipe bends or flanges, though annealing may be needed post-deformation.
Non-Magnetic Properties: Suitable for applications near magnetic fields (e.g., subsea sensors).
Cost-Effectiveness: While pricier than 316L, its longevity reduces lifecycle costs by 30–50% in harsh environments.
Standards and Quality Control
Material Certifications: Complies with ASTM A815, API 5L (PSL2), and EN 10216-5.
Testing Protocols: Mandatory autogenous weld tests (ASTM G48) and ultrasonic inspection for wall thickness uniformity.
Traceability: Heat number marking ensures full material traceability from mill to installation.
Technical Comparisons
Property
S32760
316L Austenitic
2205 Duplex
PREN
42–45
28–30
32–34
Yield Strength
550 MPa+
205 MPa
450 MPa
H₂S Resistance
Excellent
Limited
Good
Cost Factor
3.5x 316L
1x
2x
Environmental Considerations
Recyclability: 100% recyclable, with scrap value ~2.5x carbon steel.
Low Emission Fabrication: Welding processes produce minimal hazardous fumes compared to high-nickel alloys.
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