Manufacturer of duplex stainless steel seamless tube, ASTM A789/A790 duplex seamless tubing, seamless duplex 2205 Heat Exchanger Tubes, UNS S31803 seamless tubing, 2205 Bright Annealed Tubes, UNS S32205 Cold Drawn and Polished tubes. contact us for the best quote.
At New Eagle Industrial Corporation, we specialize in manufacturing and supplying premium Duplex Stainless Steel Seamless Tubes that meet the highest industry standards. Our tubes, available in UNS S31803 / S32205 grades, are designed for applications demanding exceptional strength, durability, and corrosion resistance.
Our ASTM A789 and ASTM A790 compliant tubes are produced using advanced metallurgical processes, ensuring a perfect balance of ferrite and austenite microstructure. This unique duplex composition provides twice the strength of conventional austenitic stainless steel while maintaining excellent resistance to stress corrosion cracking, pitting, and crevice corrosion. Every tube undergoes stringent quality checks for dimensional accuracy, surface finish, and mechanical performance before it leaves our facility.
We offer a wide range of sizes, wall thicknesses, and lengths to suit various industrial requirements. Whether you need schedule 40, schedule 80, or custom wall thicknesses, our duplex seamless tubes are designed for seamless integration into your piping and fabrication projects. At New Eagle Steel, we prioritize precision, reliability, and customer satisfaction, making us a trusted partner for engineers, fabricators, and industrial contractors.
Choosing New Eagle Steel’s Duplex Seamless Tubes ensures that your projects benefit from long-lasting performance, corrosion resistance, and structural integrity. With our focus on quality, timely delivery, and technical support, we help industries achieve safe and efficient operations while maximizing the life of their piping systems.
2205 Duplex Steel Seamless Tubes – Technical Specifications
ASTM A789/A790 Duplex Seamless Tubes – Chemical Composition
Duplex 2205 Stainless Steel Seamless Tubes combine austenitic and ferritic microstructures for superior corrosion resistance. The table below highlights their typical chemical composition.
| Element | Composition (wt%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Silicon (Si) | 0.5–1.0 |
| Chromium (Cr) | 21.0–23.0 |
| Nickel (Ni) | 4.5–6.5 |
| Molybdenum (Mo) | 2.5–3.5 |
| Nitrogen (N) | 0.08–0.20 |
| Iron (Fe) | Balance |
Duplex 2205 Seamless Tubes – Mechanical Properties
Duplex 2205 Stainless Steel Seamless Tubes offer excellent strength and durability for demanding industrial applications. The table below summarizes their key mechanical properties.
| Property | Value |
|---|---|
| Tensile Strength | 620–850 MPa |
| Yield Strength | 450–620 MPa |
| Elongation (L=5.65√S0) | 25–35% |
| Hardness (HRB) | 95–105 |
| Modulus of Elasticity | 200 GPa |
| Impact Toughness (Charpy V-notch) | 70–150 J |
UNS S31803 / S32205 Seamless Tubes – Equivalent Grades
This table shows the international equivalents of Duplex 2205 Stainless Steel Seamless Tubes across major standards. Easily identify the corresponding UNS, ASTM, DIN, ISO, JIS, GOST, and BS grades.
| Standard / Organization | Equivalent Grade |
|---|---|
| UNS | S31803 / S32205 |
| ASTM | A789 / A790 |
| WNr | 1.4462 |
| DIN | 1.4462 |
| ISO | ISO 31803 / 2205 |
| JIS | SUS329J3 / SUS32205 |
| GOST | 08Х22Н6Т |
| BS | SDSS 2205 |
What are the advantages of duplex stainless steel seamless tubes over austenitic stainless steel?
Duplex stainless steel seamless tubes offer several technical and operational advantages over conventional austenitic stainless steels like 304 or 316. These benefits make them ideal for demanding industrial applications. Key advantages include:
- Higher Strength:
- Duplex tubes exhibit almost twice the yield strength of standard austenitic stainless steels.
- This increased strength allows for smaller tube diameters or thinner walls without compromising structural integrity.
- The higher strength is especially useful in high-pressure piping systems or offshore applications where safety and material efficiency are critical.
- Superior Corrosion Resistance:
- Duplex stainless steels resist chloride stress corrosion cracking (SCC) far better than austenitic grades.
- They also offer excellent resistance to pitting, crevice corrosion, and intergranular attack.
- Ideal for chemical, petrochemical, marine, and desalination applications where aggressive environments can rapidly degrade conventional stainless steel.
- Cost-Effectiveness:
- Because of higher strength, projects often require less material to achieve the same mechanical performance.
- This translates into lower overall material and installation costs, while still maintaining high safety standards.
- Better Thermal Conductivity:
- Duplex stainless steel has higher thermal conductivity compared to austenitic grades.
- This property is advantageous in heat exchangers, cooling systems, and process piping where efficient heat transfer is required.
- Long Service Life and Durability:
- Duplex tubes maintain structural integrity in high-temperature and high-pressure environments.
- Resistant to both general corrosion and localized attack, which significantly increases service life.
- Reduced maintenance and replacement costs due to enhanced durability make them economically beneficial over the long term.
How are UNS S31803 duplex seamless tubes manufactured?
The production of duplex seamless tubes involves specialized metallurgical processes to ensure uniform microstructure, high strength, and corrosion resistance. The steps include:
- Hot Extrusion / Piercing:
- High-quality duplex billets are heated to precise temperatures.
- They are then extruded or pierced to create the initial tubular form, ensuring uniform diameter and wall thickness.
- Cold Drawing / Pilgering:
- The tubes are further cold-worked to achieve exact dimensions and tight tolerances.
- This process also improves surface finish and mechanical properties, enhancing performance in demanding applications.
- Solution Annealing:
- Tubes are solution-annealed at 1020–1100°C, then rapidly quenched.
- This process balances the ferrite and austenite phases, relieves internal stresses, and optimizes corrosion resistance and toughness.
- Non-Destructive Testing (NDT):
- Each tube undergoes thorough quality inspections, including eddy current, ultrasonic testing, or hydrostatic testing.
- This ensures tubes are defect-free and meet international standards (ASTM, DIN, ISO, etc.).
- Finishing and Cutting:
- Tubes are cut to standard or custom lengths.
- Surface finishing, end preparation, and dimensional verification ensure the tubes are ready for piping, fabrication, or assembly.
How to select the right UNS S32205 seamless tube for your application?
Choosing the correct duplex seamless tube depends on multiple technical and environmental factors. Consider the following points:
- Evaluate the Grade:
- Duplex 2205 (UNS S31803 / S32205): Suitable for general chemical, marine, and industrial applications.
- Super Duplex 2507 (UNS S32750 / S32760): For highly aggressive chloride-rich environments, such as offshore, seawater, or chemical plants.
- Lean Duplex 2001 (UNS S32101): Cost-effective alternative for moderate corrosion environments.
- Assess Mechanical Requirements:
- Determine operating pressure, wall thickness, and tensile strength needed for your piping or equipment.
- Higher strength grades allow for smaller diameter or thinner tubes, reducing material and installation costs.
- Consider Chemical Exposure:
- Evaluate exposure to chlorides, acids, or seawater.
- Environments with high chloride or corrosive chemicals may require higher molybdenum and nitrogen content for optimal corrosion resistance.
- Check Temperature and Operating Conditions:
- Ensure the selected grade can withstand operating temperatures without losing corrosion resistance or mechanical performance.
- Duplex stainless steel typically performs well up to 300–350°C, while super duplex can handle higher temperatures.
- Standards Compliance:
- Verify compliance with international standards such as ASTM A789/A790, DIN/WNr, ISO, JIS, or GOST.
- Proper standards compliance ensures interchangeability and global acceptance for industrial projects.
- Consult With Experts / Suppliers:
- Work with experienced suppliers like New Eagle Steel to select the right size, length, wall thickness, and grade for your project.
- Custom fabrication and cutting services can help meet unique industrial requirements.
- Future-Proofing:
- Consider potential increases in pressure, chemical exposure, or temperature.
- Choosing the right duplex grade now can avoid costly replacements or failures in the future.
Global Export Network for Duplex 2205 Seamless Tubing
As a trusted manufacturer and exporter, New Eagle Steel supplies Duplex 2205 Seamless 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
Premium Duplex Stainless Steel Seamless Tubes | UNS S31803 / S32205 | Industrial Applications
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
