Super Duplex Stainless Steel Pipes and Tubes (UNS S32750 and UNS S32760)
The super duplex stainless steel pipes and tubes are specially designed to be used in extreme conditions where temperature and pressure are high, and they cannot be built with the help of normal duplex or austenitic stainless steel. The super duplex 2570, also known as UNS S32750 and UNS 32760 are austenitic and ferritic alloy that is made with the balance microstructure which contains chromium, molybdenum, and nitrogen. This alloy is designed perfectly for high pitting and corrosion resistance also comes stress capable at much higher yield strength.
The pipes and tubes of Super Duplex are highly applicable in offshore platforms, submarine systems, desalination plants, chemical processing units and oil and gas pipelines. The grades are also capable of operating at a smaller wall thickness than conventional duplex materials without pressure integrity loss. The Duplex Steel Pipes and Tubes are frequently considered before moving to the higher grades of super duplexes in projects in which the selection of material commences on a larger scale.
Table of Contents
- Super Duplex Pipe Manufacturer and Supplier
- Types of Super Duplex Stainless Steel Pipes and Tubes
- UNS S32750 vs UNS S32760 Differences
- Surface Finish and Delivery Condition of Super Duplex Pipes
- Manufacturing Process of Super Duplex Stainless Steel Pipes
- Testing and Quality Standards for Super Duplex Pipes
- Super Duplex Pipe Price in India
Super Duplex Pipe Manufacturer and Supplier
Stellar Alloys Steel Pipes and Tubes is a big manufacturer and supplier of super duplex stainless steel pipe and tubes, providing UNS S32750 and UNS S32760 in both domestic and international markets. We provide all the products of seamless and welded super duplex pipes that conform to ASTM A790 and ASTM A789 standards. Which ensures the heat composition and heat treatment to provide a guaranteed mechanical performance.
Full traceability, mill test certificates and optional third party inspection is provided in all Super Duplex pipes and tubes. To ensure compatibility of piping networks Super Duplex products are frequently purchased alongside Stainless Steel Pipes and Tubes when mixing of material systems is required.
In projects requiring a wider selection of materials from corrosion-resistant steel families, Super Duplex pipes are often compared with products from the Super Duplex Steel category to ascertain grade suitability, corrosion performance, and long-term service compatibility across the system.
Types of Super Duplex Stainless Steel Pipes and Tubes
Super Duplex Seamless Pipe
Super Duplex Welded Pipe
Super Duplex Round Pipe
Super Duplex Seamless Tube
Super Duplex Welded Tube
Super Duplex Round Tube
UNS S32750 vs UNS S32760 Differences
While both grades fall under the Super Duplex category, UNS S32750 and UNS S32760 differ slightly in composition and corrosion performance. S32760 typically offers enhanced resistance in certain chloride-rich and seawater environments due to additional alloying control, while S32750 remains the most widely specified Super Duplex grade for general offshore and chemical service.
Parameter | UNS S32750 (Super Duplex 2507) | UNS S32760 |
Common designation | Super Duplex 2507 | Super Duplex (Zeron 100 equivalent) |
Chromium (Cr) | ~24–26% | ~24–26% |
Molybdenum (Mo) | ~3–5% | ~3–4% |
Nitrogen (N) | ~0.24–0.32% | ~0.20–0.30% |
Copper (Cu) | Typically not specified | Added copper for improved corrosion resistance |
PREN (Pitting Resistance Equivalent Number) | ≥ 40 | ≥ 40 (often slightly higher in practice) |
Corrosion resistance | Excellent resistance to pitting and crevice corrosion | Enhanced resistance in chloride-rich and seawater environments |
Stress corrosion cracking resistance | Very high | Very high, with improved performance in seawater |
Typical applications | Offshore oil and gas, chemical processing, pressure piping | Marine systems, desalination plants, seawater handling |
Availability | Widely available and commonly specified | More selective availability, often project-specific |
Industry preference | General offshore and process industry standard | Preferred where seawater and aggressive chloride exposure dominate |
Super Duplex Pipe Grades & Equivalent Standards (SAF 2507 / UNS S32750 / UNS S32760)
Knowing the various Super Duplex pipe grades and their equivalent standards ensures buyers can specify the correct materials for their projects. This understanding prevents confusion and guarantees compliance with industry requirements.
| Alloy | UNS Designation | Werkstoff NR. | Specifications | AFNOR | Grade | DIN | EN | SS |
| 2507 | S32750 | 1.4410 | A/SA789, A/SA790 | Z3 CN 25.06 Az | F53 | X 2 Cr Ni MoN 25.7.4 | 1.4410 | 2328 |
Super Duplex 2507 / 32750 / 32760 Pipe Specifications (ASTM A789 / A790 / ASME SA789 / SA790)
It is crucial for buyers to understand Super Duplex pipe specifications to verify that products meet stringent quality and performance standards. These specifications ensure reliable performance in high-stress applications.
|
ASTM A790 Pipe |
Size |
Rating |
ASTM Specification |
|
Saf 2507 Welded Pipe |
6″-12″ |
10s, 40s |
ASTM 790 |
|
2507 Seamless Pipe |
½”-8″ |
10s, 40s, 80s, 160 |
ASTM 790 |
| Super Duplex 2507 Pipe International Specification | ASTM A 789 ASME SA 789 |
| Standard Specification | ASME, ASTM, AISI, AMS, JIS, EN, SAE, DIN, NF, TOCT, DS, DTD, GB |
| Super Duplex Seamless Pipe Size | OD: 4 to 219mm Wall Thickness: 0.5 to 20mm |
| 2507 Duplex Stainless Steel Welded Pipe Size | OD: 5.0 – 1219.2 mm |
| Super Duplex 2507 EFW Pipe Size | OD: 5.0 – 1219.2 mm |
| Super Duplex Stainless Steel Pipe WT | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| 25cr Super Duplex 2507 Pipe manufacturing techniques | Seamless / ERW / EFW/ Welded / Fabricated / CDW/ LSAW/ Seam-Welded / Redrawn |
| Origin of Duplex 2507 Stainless Steel pipe material | Indian, European, Korean, Japanese |
| 2507 Duplex SS Pipe End Types | BE : Beveled end BBE : Bevel both ends BLE : Bevel large end BSE : Bevel small end TOE / POE = Treaded One End / Plain One End TOE / BOE = Treaded One End / Beveled One End POE / BOE = Plain One End / Beveled One End TBE = Treaded Both Ends PBE = Plain Both Ends |
| Form | Round, Square, Rectangular |
| Super Duplex Alloy 2507 Pipe Length | Single Random, Double Random & Required Length End: Plain End, Beveled End, Treaded |
| 2507 Super Duplex Stainless Steel Pipe Delivery Condition | Annealed and Pickled, Hot Finished, Polished, Bright Annealed, Cold Drawn |
| Super Duplex Grade 2507 Pipe Packing | Ply Wooden Boxes PE Fabric Bundles Steel Strips Bundled Standard seaworthy export packing Plastic Bags, or as required |
| Duplex Steel 2507 Pipe Value Added Services | Cut to size, thread, and groove |
| Port | Mumbai, India |
| Stocking distributor of leading Super Duplex 2507 Pipe manufacturers | Sanyo Special Steel, Japan make Super Duplex Pipe Schoeller Bleckmann, Austria make 2507 Duplex Stainless Steel Seamless Pipe Nippon Steel Corporation, Japan make Super Duplex 2507 Pipe Sumitomo Metals, Japan make ASTM A790 UNS S32750 Alloy 2507 Pipes Seah Steel Corporation, Korea make Super Duplex Stainless Steel Seamless Pipe Kobe, Japan make 25cr Super Duplex 2507 Pipe Tubacex Tubos Inoxidables S.A., Spain make Duplex 2507 Stainless Steel Pipe |
| Duplex Steel 2507 Pipe Dimensional Specification | ANSI/ ASME B36.10, B36.19, B2.1 |
| Marking on Super Duplex Saf 2507 Pipe | Specification Material Grade Nominal Size Schedule or Wall Thickness Method of Manufacturing (Seamless or Welded) Heat Number Supplier/ Manufacturer’s Name or Custom Logo – on request Marked Pipe Sample: ASTM A790 UNS S32750 12″ NB SCH 40S SEAMLESS HEAT NO. XXXX |
Chemical Composition of Super Duplex Stainless Steel 2507 / S32750 / S32760 Pipes & Tubes
Reviewing the chemical composition of Super Duplex stainless steel helps buyers assess corrosion resistance and material performance in harsh environments. This knowledge supports optimal material selection for challenging conditions.
| 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 | – |
Understanding the mechanical properties and strength characteristics of Super Duplex tubes allows buyers to evaluate their suitability for high-pressure and high-stress applications.
Mechanical Properties & Strength of Super Duplex 2507 / UNS S32760 Tubes
These properties confirm the material’s exceptional performance capabilities.
| Tensile Strength | Yield Strength | |||||||||||||
| Alloy | UNS Designation | Spec. | psi | MPa | ksi | psi | MPa | ksi | Elongation in 2 in. (min.) % | Grain Size Req. | Max. Hardness | Modulus of Elasticity (x106psi) | Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) | Thermal Conductivity (BTU-in/ ft2-h-°F) |
| 2507 | S32950 | A789, A790 | 100,000 | 690 | 100 | 70,000 | 485 | 70 | 20 | – | 30.5 Rc | – | – | – |
| 2507 | S32750 | A789, A790 | 116,000 | 800 | 116 | 80,000 | 550 | 80 | 15 | – | 32 Rc | 27.5 | 7.2 | |
Super Duplex Pipe Sizes & Schedule Chart
Access to comprehensive size and schedule charts for Super Duplex pipes helps buyers select the precise dimensions needed for their systems. Accurate sizing ensures proper fit and optimal system performance.
| 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 |
Available Size Range of Super Duplex Pipes & Tubes
It is helpful for buyers to know the complete size range available for Super Duplex pipes and tubes to plan their projects effectively. Understanding size availability streamlines procurement and project planning.
Super Duplex Seamless Pipe
- Size: 4 – 219mm
- Thickness : 0.5 – 20mm
- Length: Single, Double Random & Cut Length
- Size: 5.0 – 1219.2 mm
- Thickness : 0.5 – 20mm
- Length: Single, Double Random & Cut Length
Weight Chart of Super Duplex 2507 / 32750 / 32760 Pipes, Square Tubes & Capillary Tubes
Weight information for Super Duplex pipes and tubes assists buyers in logistics planning, cost estimation, and structural calculations. This data supports accurate project budgeting and handling requirements.
| 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 |
Surface Finish & Roughness of Super Duplex Stainless Steel Pipes (ASTM A790 SDSS Pipe Roughness)
Understanding surface finish specifications for Super Duplex stainless steel pipes ensures buyers receive products that meet their application requirements. Proper surface finish affects performance, hygiene, and aesthetic considerations.
- Annealed and Pickled
- Hot Finished
- Polished
- Bright Annealed
- Cold Drawn
Applications and Uses of Super Duplex Stainless Steel 2507 / 32750 / 32760 Pipes
Understanding the diverse applications of Super Duplex stainless steel pipes helps buyers recognize opportunities where these materials can provide superior performance. This knowledge expands potential use cases and project possibilities.Super Duplex 2507 pipes excel where regular duplex grades reach their limits. Key application sectors include:
- Oil & Gas
- Chemical & Petrochemical
- Desalination & Water Treatment
- Marine & Offshore
- Power Generation & Heat Exchangers
- Pulp & Paper
- Pharmaceutical & Food Processing
- Mining & Metallurgy
Manufacturing Process of Super Duplex Stainless Steel Pipes
Super Duplex pipes are manufactured using controlled seamless or welded processes, followed by solution annealing and rapid quenching to achieve the required duplex microstructure. Strict process control ensures consistent corrosion resistance and mechanical properties.
Testing & Quality Standards for Super Duplex Pipes (PMI, Hydro, NDT, Impact Testing)
It is essential for buyers to know the testing and quality standards applied to Super Duplex pipes to ensure they receive certified, reliable products. Comprehensive testing guarantees material integrity and performance.
- Mill Test Certificates with all Super Duplex 2507 Pipe
- EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Third Party Inspection for Super Duplex Pipe
- Mechanical Reports
- Chemical Reports
- PMI Test Reports
- Visual Inspection Reports
- Destructive Test Report
- NABL Approved Lab Reports
- Raw Materials Certificate
- Non Destructive Test Reports
- 100% Radiography Test Report
- Fumigation Certificates
- HS Code Commercial Invoice
- Heat Treatment Charts
- Surface roughness measurement
- Form A for Generalized System of Preferences (GSP)
- Laboratory Test Certificate from Govt. Approved Lab
- Moisture testing
Super Duplex Pipe Price in India
Pricing for Super Duplex stainless steel pipes and tubes depends on grade, size, schedule, quantity, and inspection requirements.
Product | Price |
Super Duplex UNS S32750 Pipes | |
Super Duplex UNS S32760 Pipes |
Note: Prices are indicative and subject to change based on raw material costs, order quantity, and technical requirements.
Surface Finish and Delivery Condition of Super Duplex Pipes
Super Duplex pipes and tubes are supplied in delivery conditions suitable for fabrication and service performance, including annealed and pickled, hot finished, cold drawn, and polished finishes. For applications requiring material compatibility across different product forms, Super Duplex pipes are frequently paired with Super Duplex Plates and Sheets during fabrication.
Testing and Quality Standards for Super Duplex Pipes
Every Super Duplex pipe is provided with detailed quality documentation in the form of EN 10204 3.1 or 3.2 certificates. PMI, hydrostatic testing, non-destructive testing, and third-party inspection are the possible testing options. In the case of mixed-grade pressure systems, the materials considered in the qualification of projects are usually Super Duplex and Alloy Steel Pipes.
Value Added Services for Super Duplex Pipes
- Cut-to-length supply
- Beveling and end finishing
- Non-destructive testing
- Export-ready packing
Why Choose Stellar Alloys Steel Pipes and Tubes for Super Duplex Pipes
Stellar Alloys Steel Pipes and Tubes provides UNS S32750 and UNS S32760 Super Duplex stainless steel pipes and tubes in applications where the reliability of materials and accuracy in documentation of materials are critical. We supply to offshore, marine, chemical, and process industries where the supply scope is in line with project requirements, and corrosion resistance and pressure integrity must not be compromised.
We also have Super Duplex pipes in seamless and welded versions and these are produced to ASTM A790 and ASTM A789 requirements. The orders are accompanied by traceable heat numbers and mill test certificates as per EN 10204 3.1 or 3.2, which contribute to uniformity throughout the raw material and subsequent delivery.
Stellar Alloys Steel Pipes and Tubes helps with the third-party inspection, pressure testing, and non-destructive testing where needed by the project specification. We can control heat treatment, dimensional tolerances, and surface condition according to international standards which will help to minimize the risk in the fabrication and installation process because of our experience in dealing with Super Duplex grades.
Having the established export handling process, we export Super Duplex pipes to international projects with the packing, marking and documentation ready to meet the customer and regulatory requirements. This is effective in ensuring that procurement teams get Super Duplex materials at a confidence that they will be of quality, comply and get them delivered at the right time.
Related Links
For projects involving multiple material grades or mixed piping systems, the following related product categories may also be relevant:
Frequently Asked Questions About Super Duplex Stainless Steel Pipes
Super Duplex 2507 contains higher chromium (24–26% vs. 22%), molybdenum (3–5% vs. 3%), nickel (6–8% vs. 5–6.5%), and nitrogen, giving it greater pitting resistance, corrosion strength, and nearly double yield strength compared to 2205.
Yes. Super Duplex grades like 2507 exhibit minimum yield strengths of 550–580 MPa and tensile strengths up to 800 MPa, roughly 20–30% higher than standard Duplex 2205.
Super Duplex 2507 performs excellently in chloride-rich and acidic settings, with a PREN above 40. It is recommended for service temperatures up to about 300 °C (572 °F), as higher sustained temperatures may reduce toughness.
Super Duplex 32760 has dual-phase microstructure and exhibits magnetic permeability around 33 at 20 °C, making it weakly magnetic but suitable for applications requiring controlled magnetic response.