Ferdi Fittings is a well-known manufacturer and supplier of Duplex Steel S31803 Pipe Fittings in Istanbul, Turkey. Duplex S31803 is a nitrogen-enhanced stainless steel that combines the best features of austenitic and ferritic grades. These fittings are recognized for their high strength, excellent resistance to corrosion, and ability to withstand stress corrosion cracking. Ferdi Fittings produces various S31803 fittings, including elbows, tees, reducers, and caps, conforming to ASTM/ASME standards. Built for durability and performance, Duplex S31803 fittings are trusted for their ability to perform in high-pressure and corrosive environments across chemical, marine, and industrial applications.
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 contains about 22% chromium, 5–6.5% nickel, 3–3.5% molybdenum, and 0.14–0.20% nitrogen, with iron as the balance. This duplex structure provides twice the strength of regular stainless steels. Mechanical properties include tensile strength of about 620 MPa, yield strength of about 450 MPa, elongation of about 25%, and hardness of around 290 HB. The alloy offers strong resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. With a well-balanced microstructure, S31803 maintains toughness and durability at low temperatures while ensuring good weldability and formability for critical piping uses in aggressive 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 % |
Ferdi Fittings is a leading supplier of Duplex Steel S31803 Pipe Fittings in Istanbul, Turkey. We offer an extensive range of Monel K500 fittings, renowned for their excellent corrosion resistance and high strength, which makes them perfect for demanding industrial applications like chemical processing, marine environments, and high-temperature systems. With a commitment to quality and reliable delivery, we ensure our clients receive top-tier products tailored to meet the specific needs of various industries.
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 Ferdi 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 Ferdi Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@ferdifittings.com.
Duplex Steel S31803 Pipe Fittings are commonly used in chemical processing, marine engineering, and oil and gas industries. Their strong resistance to chlorides makes them suitable for desalination plants, seawater systems, and offshore platforms. In petrochemical and refinery applications, they are found in heat exchangers, pressure vessels, and storage tanks. The pulp and paper industries rely on them for bleaching operations, while power plants utilize them for flue gas cleaning systems. With superior strength and corrosion resistance, Duplex S31803 fittings offer reliable, leak-proof performance in highly corrosive and high-stress piping settings.
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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