Trusted manufacturer and exporter of Duplex stainless steel coiled tubes, including ASTM A789 Duplex coiled tubes, seamless and welded Duplex tubing, UNS S32205/S31803 (2205) coiled tubes, heat-exchanger and instrumentation coiled tubes, capillary and hydraulic Duplex coiled tubes. Request a competitive bulk price quote today.
New Eagle Industrial Corporation supplies high-performance Duplex Stainless Steel Coiled Tubes engineered for demanding applications where superior strength, corrosion resistance, and long-term reliability are essential. Manufactured in seamless and welded forms, our Duplex coiled tubes meet ASTM A789/A790 standards and deliver excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich and aggressive industrial environments.
Duplex stainless steels such as UNS S32205 (2205) and UNS S31803 offer a balanced austenitic-ferritic microstructure that provides higher yield strength than conventional stainless steels while maintaining excellent corrosion performance. This combination makes Duplex coiled tubes ideal for heat exchangers, instrumentation systems, chemical injection lines, hydraulic circuits, and offshore processing equipment. Their enhanced fatigue strength and pressure-handling capability allow for safe use in high-stress, high-temperature, and corrosive service conditions.
Every Duplex coiled tubing produced with strict dimensional accuracy and surface finish control to ensure consistent performance and long operational life. Our tubes are available in long continuous coils, tight tolerances, and custom sizes to match specific project needs. All products are supplied with complete Mill Test Certificates (EN 10204 3.1) depending on the product type.
ASTM A789 UNS S32205 seamless coiled tubes – Technical Specifications
Corrosion-Resistant Duplex Coiled Tubing – Chemical Composition
The balanced mix of Cr, Ni, Mo, and N provides Duplex steel its high strength, excellent corrosion resistance, and stability in aggressive chloride environments.
| Element | Composition (%) | Short Note |
|---|---|---|
| C | ≤ 0.030 | Low carbon improves weldability and reduces carbide precipitation. |
| Mn | ≤ 2.00 | Enhances hot working and deoxidation during melting. |
| P | ≤ 0.030 | Kept low to maintain toughness and corrosion resistance. |
| S | ≤ 0.020 | Low sulphur ensures better corrosion performance and cleanliness. |
| Si | ≤ 1.00 | Improves oxidation resistance and steel fluidity. |
| Cr | 21.0 – 23.0 | Provides high resistance to pitting, crevice, and general corrosion. |
| Ni | 4.5 – 6.5 | Stabilizes austenite and enhances toughness and corrosion resistance. |
| Mo | 2.5 – 3.5 | Major contributor to pitting and crevice corrosion resistance. |
| N | 0.08 – 0.20 | Increases strength and improves localized corrosion resistance. |
| Fe | Balance | Ensures structural integrity and mechanical strength. |
2205 duplex stainless steel coiled tubing – Mechanical Properties
Duplex steel combines high tensile and yield strength with excellent ductility and toughness, making it ideal for high-pressure and corrosive service environments.
| Property | Value |
|---|---|
| Tensile Strength (min) | 620 MPa |
| Yield Strength 0.2% (min) | 450 MPa |
| Elongation (min) | 25% |
| Hardness (max) | 290 HB (or 30 HRC) |
| Impact Toughness | High (excellent toughness at low temperatures) |
UNS S32205 Duplex Steel coiled tubes – Equivalent Grades
Duplex stainless steel coiled tubes with these equivalent grades provide high strength, excellent corrosion resistance, and superior performance in harsh environments.
| Standard / Region | Equivalent Grade / Designation |
|---|---|
| UNS | S31803 / S32205 (F51) |
| ASTM | A789 / A790 |
| EN / DIN | 1.4462 |
| JIS | SUS329J3L |
| BS | 3274 |
| GOST | 06Х22Н6М2 |
What makes duplex coiled tubes different from austenitic or ferritic stainless steel tubes?
Duplex stainless steels are a balanced combination of austenitic and ferritic microstructures, providing:
- Higher strength than standard austenitic grades (almost double the yield strength).
- Superior resistance to stress corrosion cracking, particularly in chloride environments.
- Excellent pitting and crevice corrosion resistance due to higher chromium, molybdenum, and nitrogen content.
This makes them ideal for chemical, oil & gas, marine, and offshore applications.
Are duplex coiled tubes seamless or welded?
Available in both seamless and welded coiled forms:
- Seamless: Higher strength and leak-proof for high-pressure applications.
- Welded: Cost-effective for larger diameter tubing and instrumentation lines.
Both types maintain the mechanical and corrosion-resistant properties of duplex steel.
How to select the right duplex coiled tube for a specific application?
- Consider corrosive media, operating temperature, and pressure.
- Check grade equivalence to ensure compatibility with existing piping systems.
- Evaluate seamless vs welded based on installation requirements and tube length.
- Request technical datasheets and test reports from suppliers to verify performance.
Global Export Network for ASTM A789 Duplex 2205 Coil Tubing
As a trusted manufacturer and exporter, New Eagle Steel supplies Duplex Steel coiled Tubes globally. Our high-performance products are widely used in chemical processing, pollution control, marine, and pharmaceutical industries across Europe, the Middle East, Asia, and the Americas, ensuring exceptional corrosion resistance, reliability, and precision engineering.
- Middle East: United Arab Emirates (UAE), Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Yemen, Iran, Iraq, Israel, Jordan, Lebanon, Syria, Turkey
- North Africa: Egypt, Algeria, Morocco, Tunisia, Libya
- Asia Pacific: Singapore, Malaysia, Vietnam, Indonesia, Thailand, Philippines, Cambodia, Laos, Myanmar, Brunei, Timor-Leste, Taiwan, Japan, South Korea
- Europe: Spain, Belgium, Netherlands, France, Germany, Italy, United Kingdom (England), Poland, Cyprus, Malta, Russia
- Americas: Brazil, Mexico, Chile, Peru, Colombia, Argentina, United States (USA), Canada
- India: Chennai, Coimbatore, Bangalore, Thiruvananthapuram, Pune, Kolkata, Kerala, Karnataka, Gujarat, Mumbai, Delhi
Applications of Duplex Stainless Steel Coil Tubing Across Industries
Oil & Gas Industry
Petrochemical & Chemical Processing
Power Generation (Thermal, Nuclear & Renewable)
Marine & Offshore Engineering
Pharmaceuticals & Biotechnology
Food, Beverage & Dairy Processing
Pulp & Paper Industry
Aerospace & Defense
Automotive & Transportation
Instrumentation & Control Systems
Water Treatment & Desalination
HVAC & Heat Exchanger Systems
Construction & Infrastructure Projects
Mining & Metallurgy
