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New Eagle Industrial Corporation is a trusted manufacturer and global supplier of Duplex Seamless Pipes engineered for high-performance and critical service environments. Our Duplex UNS S31803 and UNS S32205 SMLS pipes are manufactured in accordance with ASTM A790, ensuring superior metallurgical stability and consistent quality. With an optimized austenite–ferrite structure, duplex seamless pipes offer exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking—making them ideal for chloride-bearing and corrosive media. Each 2205 Duplex Seamless Pipe is produced with precise dimensional control, seamless finish, and excellent weldability to deliver reliable performance in demanding installations.
Quality is integrated into every stage of production. A790 Duplex Seamless Pipes undergo stringent inspection and testing, including hydrostatic testing, ultrasonic examination, eddy current analysis, PMI, and hardness verification. Each pipe is fully traceable with MTC 3.1 certification and manufactured in compliance with international standards such as ASME, ASTM, NACE, and ISO. Advanced heat treatment processes and precise manufacturing controls ensure accurate wall thickness, high tensile strength, and exceptional corrosion resistance, making these pipes suitable for the most demanding industrial and chemical environments.
We focus on delivering customized solutions, reliable supply, and timely deliveries to support global EPC contractors, fabricators, and end users. Our commitment to quality, innovation, and customer satisfaction makes us a preferred partner for Duplex alloy piping solutions worldwide.
ASTM A790 Duplex UNS S31803 Seamless Pipes – Technical Specifications
Duplex Stainless Steel 2205 Seamless Pipe – Chemical Composition
UNS S31803 represents the standard 2205 duplex grade, offering balanced mechanical strength and corrosion resistance. UNS S32205, on the other hand, contains slightly higher levels of nickel and molybdenum, providing enhanced resistance to corrosion. It is important to note that the actual chemical composition may vary slightly depending on specific manufacturer specifications.
| Element | UNS S31803 | UNS S32205 |
|---|---|---|
| Carbon (C) | 0.03 max | 0.03 max |
| Manganese (Mn) | 2.0 max | 2.0 max |
| Phosphorus (P) | 0.03 max | 0.03 max |
| Sulfur (S) | 0.02 max | 0.02 max |
| Silicon (Si) | 1.0 max | 1.0 max |
| Chromium (Cr) | 21–23 | 22–23 |
| Nickel (Ni) | 4.5–6.5 | 5–6.5 |
| Molybdenum (Mo) | 2.0–2.5 | 3.0–3.5 |
| Nitrogen (N) | 0.08–0.20 | 0.14–0.20 |
| Iron (Fe) | Balance | Balance |
2205 Duplex Seamless Pipe – Mechanical Properties
Duplex pipes offer high yield and tensile strength, making them ideal for high-pressure applications, while their excellent toughness ensures reliable performance in aggressive chemical and marine environments. Mechanical properties may vary slightly depending on heat treatment and pipe dimensions.
| Property | UNS S31803 | UNS S32205 |
|---|---|---|
| Yield Strength (MPa) | 450–550 | 450–550 |
| Tensile Strength (MPa) | 620–720 | 620–720 |
| Elongation (%) | 25–35 | 25–35 |
| Hardness (HB) | 250 max | 250 max |
| Impact Toughness (J at 0°C) | ≥ 60 | ≥ 60 |
UNS S32205 Seamless Pipe – Equivalent Grades
This table provides the international equivalent grades for Duplex UNS S31803 and S32205 seamless pipes, covering ASTM, ASME, EN/DIN, JIS, BS, and ISO standards.
| Standard Type | S31803 Equivalent | S32205 Equivalent |
|---|---|---|
| UNS | S31803 | S32205 |
| EN / DIN | 1.4462 | 1.4462 / 2205 |
| EN Name / DIN Name | X2CrNiMoN22-5-3 | X2CrNiMoN22-5-3 |
| JIS | SUS329J3L | SUS329J3LM |
| BS / UK | – | 2205 |
| ASTM / ASME | A790 / A240 | A790 / A240 |
| ISO | – | ISO 17781 |
| Notes | Standard 2205 duplex grade | Higher Ni & Mo for enhanced corrosion resistance |
How to select between UNS S31803 and S32205 seamless pipes?
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UNS S31803 (Standard Duplex Grade):
- Suitable for standard duplex applications.
- Provides a balanced combination of high mechanical strength and toughness.
- Offers good corrosion resistance for general chemical processing and moderate chloride environments.
- Ideal for water treatment, chemical pipelines, and industrial applications where standard corrosion performance is sufficient.
-
UNS S32205 (Enhanced Duplex Grade):
- Contains higher nickel and molybdenum content for superior corrosion resistance.
- Offers enhanced protection against pitting, crevice corrosion, and stress corrosion cracking.
- Recommended for chloride-rich, aggressive chemical, or marine environments.
- Ideal for offshore platforms, desalination plants, chemical processing units, and other critical applications.
-
Selection Tip:
- Choose S31803 for moderate conditions and general applications.
- Choose S32205 for highly corrosive environments or where long-term durability is critical.
How are Duplex Seamless Pipes tested for quality?
- Hydrostatic testing
- Ultrasonic testing (UT)
- Eddy current testing
- Positive Material Identification (PMI)
- Hardness verification
- Pipes are supplied with MTC 3.1 certification and comply with ASME, ASTM, NACE, and ISO standards.
What are the advantages of seamless over welded duplex pipes?
- Uniform wall thickness
- Higher pressure and stress tolerance
- Lower risk of leaks and corrosion at welds
- Ideal for critical and high-pressure applications
Global Export Network for Duplex Seamless Pipes
As a trusted manufacturer and exporter, New Eagle Industrial Corporation supplies ASTM A790 Duplex 2205 Seamless Pipes 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
Engineering Applications of ASTM A790 Duplex UNS S31803 / S32205 Seamless Pipes
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
