Nguyen Fittings and Plates is a trusted manufacturer and supplier located in Da Nang, Vietnam, specializing in high-quality Duplex Steel S31803 Pipe Fittings. These fittings are perfect for industries that demand exceptional mechanical strength, corrosion resistance, and long-lasting reliability. With a focus on precision engineering and strict adherence to international standards, the company is dedicated to customer satisfaction, providing leak-proof, dimensionally accurate, and durable pipe fittings for sectors like oil and gas, petrochemical, chemical processing, desalination, and marine applications. Thanks to advanced manufacturing techniques, rigorous quality control, and thorough testing, Nguyen Fittings and Plates ensures safe, efficient, and cost-effective piping solutions for even the toughest industrial environments around the globe.
Specifications ASTM A815 / ASME SA815
Dimensions ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Size 1/2″ NB to 24″NB in
Type Seamless / Welded / Fabricated
Bending Radius R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom
Thickness Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS
Duplex Steel S31803 Pipe Fittings are made from a balanced mix of austenitic and ferritic stainless steel. The composition typically includes 21-23% chromium, 4.5-6.5% nickel, 2.5-3.5% molybdenum, and trace elements of nitrogen, manganese, and carbon. This composition provides high strength and excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. Mechanical properties include a tensile strength of 620 MPa, yield strength of 450 MPa, and an elongation of 25%. Duplex Steel S31803 offers superior weldability, toughness, and high resistance to corrosion in various industrial environments.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| S31803 | 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
Duplex Steel S31803 Pipe Fittings are crafted from a well-balanced austenitic-ferritic microstructure, which gives them superior tensile and yield strength compared to standard stainless steels. They also boast excellent resistance to stress corrosion cracking, pitting, and crevice corrosion. These fittings maintain consistent mechanical properties, good weldability, and structural integrity across a wide range of pressures and temperatures, making them ideal for demanding applications in harsh service conditions.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
| STANDARD | UNS | WERKSTOFF NR. |
| Duplex 2205 | S31803 | 1.4462 |
Duplex Steel S31803 Pipe Fittings from Teerasil Fittings offer exceptional corrosion resistance, especially in seawater and harsh environments. They are known for their high strength, durability, and resistance to pitting and crevice corrosion, ensuring long-lasting performance. We provide precise manufacturing, quality control, and reliable service for diverse industrial applications.
Duplex Steel S31803 pipe fittings offer exceptional corrosion resistance, particularly against pitting, crevice corrosion, and stress corrosion cracking, making them ideal for harsh environments. They provide high strength and excellent resistance to fatigue, making them durable under pressure. The alloy’s good weldability and formability enhance the ease of fabrication. Duplex Steel S31803 pipe fittings also offer superior toughness and stress resistance, ensuring reliability in demanding applications such as chemical processing, marine, and oil & gas industries. Their cost-effectiveness and long-lasting performance make them a preferred choice for critical piping systems.
| Outer Diameter And Inside Diameter | Equivalent | Diameter Of Pipe Nominal | Typical Threads In Inches |
| 5/16 | 0.313 | 1/16 | 27 |
| 13/32 | 0.405 | 1/8 | 27 |
| 35/64 | 0.540 | 1/4 | 18 |
| 43/64 | 0.675 | 3/8 | 18 |
| 27/32 | 0.840 | 1/2 | 14 |
| 1-3/64 | 1.050 | 3/4 | 14 |
| 1-5/16 | 1.315 | 1 | 11-1/2 |
| 1-21/32 | 1.660 | 1-1/4 | 11-1/2 |
| 1-29/32 | 1.900 | 1-1/2 | 11-1/2 |
| 2-3/8 | 2.375 | 2 | 11-1/2 |
| 2-7/8 | 2.875 | 2-1/2 | 8 |
| 3-1/2 | 3.500 | 3 | 8 |
| 4 | 4.000 | 3-1/2 | 8 |
Yes, custom sizes for Duplex Steel S31803 Pipe Fittings are available at Teerasil Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@teerasilfittings.com.
You’ll find Duplex Steel S31803 Pipe Fittings in various settings, including offshore platforms, subsea pipelines, heat exchangers, pressure vessels, seawater desalination units, and chemical process plants. They’re also utilized in the pulp and paper industry, power generation facilities, and water treatment systems, where both corrosion resistance and high mechanical strength are crucial. Their unique blend of durability, performance, and cost-effectiveness guarantees safe, continuous, and reliable operation in some of the most challenging industrial environments worldwide.
Get in touch with one of our Technical Sales Representatives to request a quote or get answers to any questions you may have.
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