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Duplex 2507 Pipe is a super duplex stainless steel designed for challenging environments requiring excellent corrosion resistance, high strength, and resilience against stress corrosion cracking. This unique alloy is composed of a balanced ferritic-austenitic microstructure enriched with 25% chromium, 4% molybdenum, and 7% nickel, making it ideal for marine, chemical processing, petrochemical, and offshore applications.
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What is Duplex 2507 Pipe
Duplex 2507 Pipe (also known as Super Duplex 2507 Stainless Steel Pipe) is a high‑performance stainless steel piping solution engineered for the most demanding industrial environments. As a super duplex stainless steel alloy (UNS S32750/EN 1.4410), it offers exceptional corrosion resistance, superior strength, and outstanding resistance to stress corrosion cracking, outperforming many conventional austenitic and duplex stainless steels in chloride‑rich and aggressive media.
Thanks to its balanced ferritic‑austenitic microstructure enriched with chromium (~25%), molybdenum (~4%), nickel (~7%), and nitrogen, Duplex 2507 Pipes provide excellent protection against pitting, crevice, and general corrosion, making them ideal for marine engineering, chemical processing, petrochemical, oil & gas, desalination, and offshore applications.
Whether you need seamless or welded configurations in custom sizes, our Duplex 2507 Pipes ensure long service life, reduced maintenance, and high mechanical performance even in harsh environments - a premium choice for critical industrial piping systems.
For projects demanding superior performance, Duplex 2507 Pipe offers an outstanding solution. This high-alloy super duplex stainless steel pipe delivers excellent resistance to chloride pitting, crevice corrosion, and stress corrosion cracking. Available in annealed and pickled condition, it meets stringent specifications like ASTM A790 and is produced in a wide range of diameters and wall thicknesses (e.g., 1" Sch 40, 8" Sch 80) to meet your precise engineering requirements.
Key Features of Duplex 2507 Pipe
Superior Corrosion Resistance: Offers resistance to pitting, crevice, and general corrosion, particularly in chloride-rich environments.
High Strength: Duplex 2507 has double the strength of austenitic stainless steel, making it ideal for high-pressure systems.
Resistance to Stress Corrosion Cracking: Performs exceptionally well in environments where stress corrosion cracking is a concern.
Excellent Weldability: Duplex 2507 is easily weldable, making it a popular choice for custom piping systems.
Long Service Life: With superior resistance to corrosion, this pipe ensures reduced maintenance costs and extended system life.
Applications of Duplex 2507 Pipe
Marine Engineering & Offshore Applications
Duplex 2507 Pipe is commonly used in offshore oil rigs, marine vessels, and coastal infrastructure exposed to harsh saltwater environments. Its superior resistance to seawater corrosion and chloride stress cracking ensures long-lasting, reliable performance.
Desalination & Water Treatment
The high chloride resistance of Duplex 2507 makes it a top choice for desalination plants and water treatment systems, ensuring long-term performance in seawater environments.
Chemical & Petrochemical Industries
Ideal for use in chemical reactors, storage tanks, piping systems, and heat exchangers, Duplex 2507 offers outstanding resistance to aggressive acids, alkalis, and chlorine-based chemicals, making it perfect for demanding petrochemical and chemical processing environments.
Construction & Architectural Uses
Duplex 2507 is also utilized in high-strength construction applications such as marine structures, piping systems, and architectural facades, particularly where corrosion resistance and strength are critical.
Duplex 2507 Specifications
| Attribute | Specification |
|---|---|
| Grade | Duplex 2507 (Super Duplex Stainless Steel) |
| Standard | UNS S32750, EN 1.4410 |
| Thickness | 0.5mm – 100mm |
| Outside Diameter (OD) | 6mm – 250mm |
| Length | Custom lengths |
| Surface Finish | Pickled, Passivated, Polished |
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Density | 7.8 g/cm³ |
| Corrosion Resistance | Excellent in seawater, chloride, and acid environments |
Benefits of Duplex 2507 Pipe
Exceptional Corrosion Resistance: Ideal for use in chloride-rich environments like seawater and industrial chemicals.
High Strength & Durability: Double the strength of 304 stainless steel, ensuring long-lasting performance in high-pressure and high-temperature applications.
Resistance to Stress Corrosion Cracking: Superior resistance in critical environments, making it perfect for offshore, marine, and chemical systems.
Versatility in Applications: Suitable for a wide range of industries, including marine engineering, chemical processing, oil & gas, and desalination.
Super Duplex Alloy 2507 Pipe Schedule and Wall Thickness
| Nominal | O.D. Inches | 10s | 10 | 40s & Std | 40 | 80s & E.H. | 80 | 160 |
|---|---|---|---|---|---|---|---|---|
| 1/8 | .405 | .049 | .049 | .068 | .068 | .095 | .095 | |
| 1/4 | .540 | .065 | .065 | .088 | .088 | .119 | .119 | |
| 3/8 | .675 | .065 | .065 | .091 | .091 | .126 | .126 | |
| 1/2 | .840 | .083 | .083 | .109 | .109 | .147 | .147 | .187 |
| 3/4 | 1.050 | .083 | .083 | .113 | .113 | .154 | .154 | .218 |
| 1 | 1.315 | .109 | .109 | .133 | .133 | .179 | .179 | .250 |
| 1 1/4 | 1.660 | .109 | .109 | .140 | .140 | .191 | .191 | .250 |
| 1 1/2 | 1.900 | .109 | .109 | .145 | .145 | .200 | .200 | .281 |
| 2 | 2.375 | .109 | .109 | .154 | .154 | .218 | .218 | .343 |
| 2 1/2 | 2.875 | .120 | .120 | .203 | .203 | .276 | .276 | .375 |
| 3 | 3.500 | .120 | .120 | .216 | .216 | .300 | .300 | .437 |
| 3 1/2 | 4.000 | .120 | .120 | .226 | .226 | .318 | .318 | |
| 4 | 4.500 | .120 | .120 | .237 | .237 | .337 | .337 | .531 |
| 4 1/2 | 5.000 | .247 | .355 | |||||
| 5 | 5.563 | .134 | .134 | .258 | .258 | .375 | .375 | .625 |
| 6 | 6.625 | .134 | .134 | .280 | .280 | .432 | .432 | .718 |
| 7 | 7.625 | .301 | .500 | |||||
| 8 | 8.625 | .148 | .148 | .322 | .322 | .500 | .500 | .906 |
| 9 | 9.625 | .342 | .500 | |||||
| 10 | 10.750 | .165 | .165 | .365 | .365 | .500 | .593 | 1.125 |
| 11 | 11.750 | .375 | .500 | |||||
| 12 | 12.750 | .180 | .180 | .375 | .406 | .500 | .687 | 1.312 |
| 14 | 14.000 | .188 | .250 | .375 | .437 | .500 | .750 | 1.406 |
| 16 | 16.000 | .188 | .250 | .375 | .500 | .500 | .843 | 1.593 |
| 18 | 18.000 | .188 | .250 | .375 | .562 | .500 | .937 | 1.781 |
2507 Super Duplex Stainless Steel Seamless Pipe Weight Chart
| Pipe OD mm |
Pipe WT mm |
Nominal size | Weight, kg/m |
|---|---|---|---|
| 21.34 | 2.11 | 1/2" 10S | 1.02 |
| 21.34 | 2.77 | 1/2" 40S | 1.29 |
| 26.67 | 2.11 | 3/4" 10S | 1.30 |
| 26.67 | 2.87 | 3/4" 40S | 1.71 |
| 33.40 | 1.65 | 1" 5S | 1.31 |
| 33.40 | 2.77 | 1" 10S | 2.13 |
| 33.40 | 3.38 | 1" 40S | 2.54 |
| 42.16 | 1.65 | 1 1/4" 5S | 1.67 |
| 42.16 | 2.77 | 1 1/4" 10S | 2.73 |
| 42.16 | 3.56 | 1 1/4" 40s | 3.44 |
| 48.26 | 1.65 | 1 1/2" 5S | 1.92 |
| 48.26 | 2.77 | 1 1/2" 10S | 3.16 |
| 48.26 | 3.68 | 1 1/2" 40S | 5.49 |
| 60.33 | 1.65 | 2" 5S | 2.42 |
| 60.33 | 2.77 | 2" 10S | 3.99 |
| 60.33 | 3.91 | 2" 40S | 5.52 |
| 73 | 3.05 | 2 1/2" 10s | 5.35 |
| 73 | 5.16 | 2 1/2" 40S | 8.77 |
| 88.90 | 2.11 | 3" 5S | 4.58 |
| 88.90 | 3.05 | 3" 10S | 6.56 |
| 88.90 | 5.49 | 3" 40S | 11.47 |
| 101.60 | 3.05 | 3 1/2" 10s | 7.53 |
| 114.30 | 2.11 | 4" 5S | 5.93 |
| 114.30 | 3.05 | 4" 10S | 8.50 |
| 114.30 | 6.02 | 4" 40S | 16.32 |
| 141.3 | 3.4 | 5" 10S | 11.74 |
| 141.3 | 6.55 | 5" 40S | 22.1 |
| 168.3 | 2.77 | 6" 5S | 11.48 |
| 168.3 | 3.4 | 6" 10S | 14.04 |
| 168.3 | 7.11 | 6" 40S | 28.69 |
| 219.1 | 2.77 | 8" 5S | 15.0 |
| 219.1 | 3.76 | 8" 10S | 20.27 |
| 219.1 | 8.18 | 8" 40S | 43.2 |
| 273 | 3.40 | 10" 5S | 22.95 |
| 273 | 4.19 | 10" 10S | 28.2 |
| 273 | 9.27 | 10" 40S | 61.22 |
| 323.9 | 3.96 | 12" 5S | 31.72 |
| 323.9 | 4.57 | 12" 10S | 36.54 |
| 323.9 | 9.53 | 12" 40S | 75.02 |
| 355.6 | 4.78 | 14" 10S | 41.99 |
| 355.6 | 9.53 | 14" STD | 82.583 |
| 406.4 | 9.53 | 16" STD | 94.706 |
| 406.4 | 4.78 | 16" 10S | 48.07 |
| 457.2 | 4.78 | 18" 10S | 54.151 |
| 508.0 | 5.54 | 20" 10S | 69.702 |
| 610.0 | 6.35 | *24" 10S | 95.919 |
Schedule 40 Duplex Steel 2507 Pipe thickness and dimensions
| Nominal size [inches] | Outside diameter (OD) [inches] | Outside diameter (OD) [mm] | Wall thickness [inches] | Wall thickness [mm] | Weight [lb/ft] | Weight [kg/m] |
|---|---|---|---|---|---|---|
| 1/8" NPS 6 | 0.41 | 10.3 | 0.068 | 1.73 | 0.24 | 0.37 |
| 1/4" NPS 8 | 0.54 | 13.7 | 0.088 | 2.24 | 0.42 | 0.63 |
| 3/8" NPS 10 | 0.68 | 17.1 | 0.091 | 2.31 | 0.57 | 0.84 |
| 1/2" NPS 15 | 0.84 | 21.3 | 0.109 | 2.77 | 0.85 | 1.27 |
| 3/4" NPS 20 | 1.05 | 26.7 | 0.113 | 2.87 | 1.13 | 1.69 |
| 1" NPS 25 | 1.32 | 33.4 | 0.133 | 3.38 | 1.68 | 2.5 |
| 1 1/4" NPS 32 | 1.66 | 42.2 | 0.14 | 3.56 | 2.27 | 3.39 |
| 1 1/2" NPS 40 | 1.9 | 48.3 | 0.145 | 3.68 | 2.72 | 4.05 |
| 2" NPS 50 | 2.375 | 60.3 | 0.154 | 3.91 | 3.65 | 5.44 |
| 2 1/2" NPS 65 | 2.875 | 73.0 | 0.203 | 5.16 | 5.79 | 8.63 |
| 3" NPS 80 | 3.5 | 88.9 | 0.216 | 5.49 | 7.58 | 11.29 |
| 3 1/2" NPS 90 | 4.0 | 101.6 | 0.226 | 5.74 | 9.11 | 13.57 |
| 4" NPS 100 | 4.5 | 114.3 | 0.237 | 6.02 | 10.79 | 16.07 |
| 5" NPS 125 | 5.563 | 141.3 | 0.258 | 6.55 | 14.62 | 21.77 |
| 6" NPS 150 | 6.625 | 168.3 | 0.28 | 7.11 | 18.97 | 28.26 |
| 8" NPS 200 | 8.625 | 219.1 | 0.322 | 8.18 | 28.55 | 42.55 |
| 10" NPS 250 | 10.75 | 273.0 | 0.365 | 9.27 | 40.48 | 60.31 |
| 12" NPS 300 | 12.75 | 323.8 | 0.406 | 10.31 | 53.52 | 79.73 |
| 14" NPS 350 | 14.0 | 355.6 | 0.437 | 11.13 | 54.57 | 94.55 |
| 16" NPS 400 | 16.0 | 406.4 | 0.5 | 12.7 | 82.77 | 123.3 |
| 18" NPS 450 | 18.0 | 457.0 | 0.562 | 14.27 | 104.67 | 155.8 |
| 20" NPS 500 | 20.0 | 508.0 | 0.594 | 15.09 | 123.11 | 183.42 |
| 24" NPS 600 | 24.0 | 610.0 | 0.688 | 17.48 | 171.29 | 255.41 |
| 32" NPS 800 | 32.0 | 813.0 | 0.688 | 17.48 | 230.08 | 342.91 |
Super Duplex Saf 2507 Seamless Pipe Chemical Composition
| Grade | Super Duplex 2507 |
|---|---|
| Carbon (C) Max. | 0.030 |
| Manganese (Mn) Max. | 1.20 |
| Phosphorous (P) Max. | 0.035 |
| Sulphur (S) Max. | 0.020 |
| Silicon (Si) Max. | 0.80 |
| Chromium (Cr) | 24.0–26.0 |
| Nickel (Ni) | 6.0–8.0 |
| Molybdenum (Mo) | 3.0–5.0 |
| Nitrogen (N) | 0.24–0.32 |
| Iron (Fe) | Bal. |
| Copper (Cu) | 0.50 |
| Other Elements | - |
Comparison of Duplex 2507 with Other Stainless Steel Alloys
| Property | Duplex 2507 | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|---|
| Corrosion Resistance | Superior in chloride, seawater, and acid environments | Good but susceptible to chloride corrosion | Excellent in seawater, but not as resistant as 2507 |
| Tensile Strength | 620 MPa | 505 MPa | 515 MPa |
| Yield Strength | 450 MPa | 215 MPa | 205 MPa |
| Resistance to SCC (Stress Corrosion Cracking) | Excellent | Poor in chloride environments | Good in marine environments |
| Applications | Offshore, chemical, marine | Food, dairy, general industry | Marine, food, pharmaceutical |
Packing
FAQ
Q1: What is Duplex 2507 Pipe made of?
Duplex 2507 is a super duplex stainless steel containing 25% chromium, 4% molybdenum, and 7% nickel, offering outstanding resistance to corrosion and stress corrosion cracking.
Q2: Where is Duplex 2507 Pipe commonly used?
Duplex 2507 Pipe is widely used in marine engineering, offshore platforms, chemical processing plants, petrochemical refineries, desalination systems, and water treatment applications.
Q3: Can Duplex 2507 Pipe be welded?
Yes, Duplex 2507 is highly weldable. It is suitable for various welding processes and offers excellent weldability without compromising its corrosion resistance.
Q4: What is the difference between Duplex 2507 and other duplex steels?
Duplex 2507 has higher corrosion resistance and strength compared to many other duplex alloys due to its higher chromium and molybdenum content, making it suitable for more aggressive environments like seawater and chemical exposure.
Q5: What is the maximum operating temperature for Duplex 2507 Pipe?
Duplex 2507 can handle continuous temperatures up to 300°C (572°F), with occasional spikes to 320°C (608°F), making it ideal for high-temperature applications in chemical processing and marine systems.
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