ARK Stainless Inc. is a trusted manufacturer and supplier of high-quality Duplex & Super Duplex Stainless Steel Pipes & Tubes, engineered for exceptional performance in the most demanding industrial environments. These pipes and tubes are developed using superior-grade raw materials and advanced manufacturing technology to ensure reliability, strength, and long-term durability.
We offer a comprehensive range of Duplex grades such as UNS S31803 and S32205, and Super Duplex grades including UNS S32750 and S32760. Manufactured in accordance with international specifications like ASTM A789, ASTM A790, and dimensional standards such as ASME, ANSI, and ASTM, our pipes and tubes meet critical performance criteria across various industrial sectors.
These pipes and tubes exhibit exceptional resistance to corrosion, especially in aggressive environments involving saltwater, acidic substances, and chloride-rich conditions. Their dual-phase (ferritic-austenitic) microstructure offers excellent mechanical strength, stress corrosion resistance, and durability, making them ideal for applications in marine, chemical processing, offshore oil & gas, heat exchangers, and desalination plants.
Our Duplex & Super Duplex Steel Pipes & Tubes are available in seamless, welded, ERW, and EFW forms, with a wide range of diameters, thicknesses, and lengths to suit varied application needs. These products are offered in round, square, and custom shapes, with precise dimensions and smooth finishes, and can also be customized according to client specifications.
Known for their robust construction, high tensile strength, and excellent resistance to galling, these pipes and tubes maintain leak-proof integrity even under high pressure and temperature fluctuations. Their superior performance and long service life reduce maintenance requirements and downtime, ensuring reliable and cost-effective solutions for modern industrial systems.
| Grade | Common Name | C% | Mn% | Si% | P% | S% | Cr% | Ni% | Mo% | N% | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S31803 | Duplex 2205 | ≤ 0.03 | ≤ 2.00 | ≤ 1.00 | ≤ 0.030 | ≤ 0.020 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.14–0.20 | — |
| S32205 | Duplex 2205 | ≤ 0.03 | ≤ 2.00 | ≤ 1.00 | ≤ 0.030 | ≤ 0.020 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 | — |
| S32750 | Super Duplex 2507 | ≤ 0.03 | ≤ 1.20 | ≤ 0.80 | ≤ 0.035 | ≤ 0.020 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 | W: ≤ 0.50, Cu: ≤ 0.50 |
| S32760 | Super Duplex Zeron 100 | ≤ 0.03 | 0.50–1.00 | ≤ 1.00 | ≤ 0.030 | ≤ 0.010 | 24.0–26.0 | 6.0–8.0 | 3.0–4.0 | 0.20–0.30 | W: 0.50–1.00, Cu: 0.50–1.00 |
| Property | Duplex Steel S31803 / S32205 | Super Duplex Steel S32750 / S32760 |
|---|---|---|
| Tensile Strength | 620 MPa min | 116 ksi (800 MPa) min |
| Yield Strength | 450 MPa min | 80 ksi (550 MPa) min (0.2% offset) |
| Yield Strength (0.1% Offset) | - | 91 ksi (625 MPa) min |
| Elongation | - | 15% min in 2 inches |
| Hardness (Rockwell C) | - | 32 max |
| Impact Energy | - | 74 ft.-lbs. min |
| Density | 7,805 kg/m³ | - |
| Elastic Modulus | 200 GPa | - |
Duplex Steel S31803/S32205 Pipes & Tubes are extensively used in applications such as oil & gas processing, desalination plants, chemical processing, heat exchangers, marine engineering, pulp & paper industry, structural components, and offshore platforms due to their high strength and excellent resistance to corrosion and stress cracking. To ensure superior performance and adherence to industry standards, every batch of Duplex Pipes & Tubes undergoes rigorous quality testing. These include intergranular corrosion (IGC) tests, pitting resistance tests, mechanical and chemical analysis, and non-destructive tests. We also provide essential documentation with each delivery, including a Quality Assurance Plan (QAP), Mill Test Certificate (MTC) in compliance with EN 10204/3.1, third-party inspection reports, and radiography test reports to guarantee product reliability and traceability.
| STANDARD | UNS | WNR. |
|---|---|---|
| Duplex S31803 / S32205 | S31803 / S32205 | 1.4462 |
The Super Duplex S32750/S32760 Pipes & Tubes are known for their exceptional strength, high corrosion resistance, and reliable performance in the most demanding environments. These pipes and tubes exhibit superior resistance to pitting, crevice corrosion, and stress corrosion cracking, making them ideal for aggressive and high-pressure applications such as marine, chemical processing, desalination, and offshore industries.
These pipes & tubes are manufactured according to international standards like ASTM A790 / ASME SA790 and ASTM A789 / ASME SA789. Available sizes range from 1/2”NB to 24”NB with a wide variety of wall thicknesses such as SCH 5, SCH10, SCH40, SCH80, SCH160, SCH XXS, etc., and outer diameters up to 630mm. They are offered in multiple forms like Seamless, ERW, Welded, and Fabricated, and shapes including Round, Square, and Rectangular.
Featuring excellent mechanical properties, these pipes & tubes offer high toughness, robust construction, and ease of fabrication. They are available in finishes such as Annealed & Pickled, Polished, Bright Annealed, and Cold Drawn, with end types like Plain End, Beveled End, and Threaded, and protected with plastic caps for secure transportation.
To ensure quality and compliance, every batch undergoes strict testing and inspection, with comprehensive documentation including Mill Test Certificates, EN 10204 3.1, Chemical and Mechanical Reports, PMI Test Reports, Visual and Third-Party Inspection Reports, NABL Approved Lab Reports, and both destructive and non-destructive test reports.
With outstanding workability and a long service life, Super Duplex Pipes & Tubes are an ideal choice for critical applications. They are packed securely in Wooden Boxes, Plastic Bags, or Steel-Stripped Bundles as per customer requirements. Custom sizes and specifications are also available on request to suit project-specific needs.
| STANDARD | UNS | WNR. |
|---|---|---|
| Super Super Duplex S32750 / S32760 | S32760 / S32750 | 1.4410 |
