Ferdi Fittings is a top manufacturer and supplier of Duplex Steel UNS S31803 Buttweld Fittings in Istanbul, Turkey. Known for their high strength and exceptional corrosion resistance, UNS S31803 fittings are designed to function in aggressive and chloride-rich settings. Ferdi Fittings makes these buttweld fittings in line with ASTM/ASME standards, offering products like elbows, reducers, tees, and caps. The duplex structure of UNS S31803 provides double the strength of standard stainless steel and improved resistance to stress corrosion cracking. These fittings are trusted across industries for reliable and long-lasting piping solutions.
| Standards | ASTM, ASME |
| Designation | A815, SA815 |
| Dimension Standard | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Grade | Duplex Steel S31803 Buttweld Pipe Fittings. |
| Type | Seamless, Welded |
| Thickness | Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
| Size | 1/2″ to 24″ |
| Two Joint / Two Halve S31803 Butt weld Fittings Size | 6″ to 48″ |
| Types of Butt weld Fittings | Equal Tee, Nipple, Long Radius Elbow, Reducing Tee, Elbows, Swage Nipple, Short Radius Elbow, Reducer, Barrel Nipple, 90 Deg Elbow, Concentric Reducer, Reducing Nipple, 45 Deg Elbows, Eccentric Reducer, Bend, 180 Deg Elbow, End Cap, 1D Elbow, 3D Elbow, Stubend, 5D Elbow, Cap, Piggable Bend, Long Stubend, Tee, Short Stubend, Long Radius Bend. |
| Also as per National & International Standard &Specification | |
UNS S31803 contains approximately 22% chromium, 5–6.5% nickel, 3–3.5% molybdenum, and 0.14–0.20% nitrogen, with iron as the balance. Mechanical properties include tensile strength of around 620 MPa, yield strength of about 450 MPa, elongation of about 25–30%, and hardness of around 290 HB. Its duplex microstructure enhances strength and toughness, with robust resistance to chloride stress cracking. UNS S31803 fittings maintain structural stability at both low and high temperatures, ensuring strong performance. This alloy combines good weldability, durability, and resistance to localized corrosion, making it a reliable choice for challenging piping tasks.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| Duplex Steel S31803 | 0.030 max | 2 max | 1 max | 0.030 max | 0.020 max | 22 – 23 | 3 – 3.50 | 4.50 – 6.50 | 0.14 – 0.20 | Bal |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 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 UNS S31803 Buttweld Fittings in Istanbul, Turkey. We offer an extensive range of Duplex Steel UNS S31803 Buttweld 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 | WERKSTOFF NR. | UNS |
| Duplex Steel S31803 | 1.4462 | S31803 |
Choose Duplex Steel UNS S31803 Buttweld Fittings from Ferdi Fittings for superior quality, exceptional corrosion resistance, and reliable performance in extreme conditions. We offer customized solutions backed by expert support and industry experience.
Duplex Steel UNS S31803 Buttweld Fittings offer several advantages, including excellent resistance to corrosion, pitting, and stress corrosion cracking, making them ideal for harsh environments. Their unique dual-phase microstructure provides a high strength-to-weight ratio, offering greater tensile and yield strength than standard austenitic stainless steels. These fittings also exhibit superior weldability, making them easier to work with in fabrication processes. UNS S31803 fittings are highly durable in industries such as chemical processing, oil and gas, and marine applications, ensuring long-lasting performance even in high-pressure, high-temperature environments.
Yes, custom sizes for Duplex Steel UNS S31803 Buttweld 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 UNS S31803 Buttweld Fittings are commonly used in offshore oil rigs, chemical plants, and desalination systems. Their strong resistance to chloride stress cracking makes them suitable for seawater and brine applications. They are also used in power generation systems, pressure vessels, and heat exchangers exposed to high temperatures and corrosive conditions. The pulp and paper industries use them for bleaching operations. With excellent durability, Duplex S31803 buttweld fittings offer leak-proof and corrosion-resistant performance, ensuring long service life in critical industrial 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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