Super Duplex UNS S32760 / EN 1.4501 Stainless Steel Seamless Pipe
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 |
Introduction to S32760 Duplex Stainless Steel Pipe
S32760 duplex stainless steel pipe, also known as super duplex
stainless steel, is a high-performance alloy renowned for its
exceptional combination of strength, corrosion resistance, and
durability. Here’s a detailed overview:
Chemical Composition
The key elements of S32760 include:
- Chromium (Cr): 24–26%
- Nickel (Ni): 6–8%
- Molybdenum (Mo): 3–5%
- Tungsten (W): 0.5–1%
- Nitrogen (N): 0.2–0.3%
- Carbon (C): ≤0.03%
- Other elements: Iron (Fe) as the base, with small additions of
copper (Cu) and manganese (Mn).
This composition creates a balanced duplex microstructure of
austenite and ferrite phases, enhancing its mechanical and
corrosion-resistant properties.
Mechanical Properties
- Tensile Strength: ≥750 MPa
- Yield Strength: ≥550 MPa
- Elongation: ≥25%
- Hardness (HB): ≤310
- Density: ~8.0 g/cm³
These properties make S32760 pipes suitable for high-pressure and
high-stress applications, far exceeding those of standard stainless
steels like 304 or 316.
Corrosion Resistance
S32760 excels in resisting:
- Pitting and Crevice Corrosion: Due to high Cr, Mo, and W content,
it performs well in chloride-rich environments (e.g., seawater,
brine).
- Stress Corrosion Cracking (SCC): The duplex structure and nitrogen
addition significantly reduce SCC risk compared to austenitic
steels.
- General Corrosion: Resistant to acids, alkalis, and organic
solvents, making it ideal for chemical processing.
Applications
S32760 duplex stainless steel pipes are widely used in:
- Oil and Gas Industry: Offshore pipelines, subsea equipment, and
chemical injection systems.
- Chemical and Petrochemical Plants: Reactors, heat exchangers, and
pipelines for corrosive media.
- Marine Engineering: Shipbuilding, seawater desalination systems,
and coastal infrastructure.
- Power Generation: Flue gas desulfurization (FGD) systems and
high-temperature components.
- Food and Pharmaceutical Industries: Equipment requiring high
hygiene and corrosion resistance.
Advantages
- High Strength-to-Weight Ratio: Reduces material usage and costs in
structural designs.
- Superior Durability: Long service life in harsh environments,
minimizing maintenance.
- Weldability: Can be welded using standard techniques, though
post-weld heat treatment is sometimes recommended to optimize
properties.
- Resistance to High Temperatures: Maintains stability in
applications up to ~300°C.
Standards and Specifications
S32760 conforms to international standards such as:
- ASTM A790 (USA)
- EN 10216-5 (Europe)
- ISO 1127 (International)
Manufacturers typically provide certificates verifying chemical
composition, mechanical properties, and non-destructive testing
(NDT) results.
Comparison with Other Duplex Steels
| Grade | Strength | Corrosion Resistance | Main Applications |
|---|
| S31803 (2205) | Moderate | Good in mild chloride environments | General industrial use |
| S32760 | High | Excellent in severe chloride and acidic conditions | Offshore, chemical processing |
| S32750 (2507) | Very high | Similar to S32760 but with slightly lower W content | Demanding marine and oil & gas |
Conclusion
S32760 duplex stainless steel pipe stands out as a premium material
for critical applications where extreme corrosion resistance and
high strength are non-negotiable. Its unique microstructure and
alloy composition make it a preferred choice for industries
operating in challenging environments, ensuring reliability and
cost-effectiveness over the long term.
ASTM A312 309S SS Pipe DIN 1.4833 Seamless Stainless Steel Round Pipe
