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S32760 (1.4501) Super Duplex Pipe With Excellent Pitting and Stress Corrosion Cracking Resistance
| Place of Origin | China |
|---|---|
| Brand Name | DELTA |
| Certification | ISO |
| Model Number | s32760 |
| Minimum Order Quantity | 500 kgs |
| Price | 8-12 USD/Kg |
| Packaging Details | standard packing for export |
| Delivery Time | 5 - 12 days based on the quantity |
| Payment Terms | L/C, T/T, Western Union |
| Supply Ability | 3 Ton per week |
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xProduct Details
| Products | Stainless Steel Seamless Pipe | Grade | S32760 |
|---|---|---|---|
| Diameter | DN10 - DN400 | Length | 6m Or Custom Cutting Any Length As Request |
| Standard | ASTM EN | Service | Cutting |
| Loading Port | Shanghai Port | Thickness | 4.0 - 50.0mm |
Product Description
S32760 (1.4501) Super Duplex Pipe With Excellent Pitting and Stress Corrosion Cracking Resistance
Products Specification
| Products Name | s32760 Duplex Stainless Steel Seamless Pipe |
Grade: |
304 304L 309S 310S 314 316L 316Ti 321 329 347H 410 2205 2507 S32760 904L 254SMO and equal grade in GB JIS EN DIN Standard |
| Standards: | ASTM A213M-94b ASTM A249M-94a ASTM A269-94a ASTM A312M-94b,ect. |
| DIN 17456-85 DIN 17458-85 DIN 17459-92.ect | |
| 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.
- Molybdenum (4.5%) & Tungsten (1%): Synergistically combat pitting in chloride solutions.
- 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.
- Long-Term Sustainability: Reduces replacement needs in coastal infrastructure, minimizing environmental disruption.
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