Machuca Fittings, located in Kuala Lumpur, Malaysia, has earned a solid reputation as a reliable manufacturer and supplier of Duplex Steel UNS S31803 Buttweld Fittings. They specialize in providing high-performance solutions tailored for demanding industrial applications. Their impressive lineup features elbows, tees, reducers, crosses, and end caps, all meticulously engineered to ensure leak-proof connections, outstanding durability, and long-lasting reliability. UNS S31803 is a popular duplex stainless steel grade that merges austenitic and ferritic microstructures, offering remarkable resistance to pitting, crevice corrosion, and stress corrosion cracking, along with exceptional tensile strength and toughness. Machuca Fittings guarantees that their S31803 Buttweld Fittings comply with international standards across various sectors, including chemical, petrochemical, marine, oil & gas, and power generation.
| 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 | |
The Duplex Steel UNS S31803 Buttweld Fittings are made up of roughly 22% chromium, 5–6% nickel, 3% molybdenum, 0.14–0.20% nitrogen, and trace amounts of manganese, silicon, and carbon. This unique composition grants them outstanding resistance to corrosion in environments rich in chlorides and oxidizing agents, all while maintaining impressive tensile and yield strength. The dual-phase microstructure ensures excellent toughness, good ductility, and resilience against thermal and mechanical stress. With their strong weldability, formability, and durability, UNS S31803 Buttweld Fittings are designed to perform reliably under high-pressure, high-temperature, and chemically aggressive conditions.
| 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 % |
Machuca Fittings is a leading supplier of Duplex Steel UNS S31803 Buttweld Fittings in Kuala lumpur, Malaysia. 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 Machuca 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 Machuca Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@machucafittings.com
These fittings are extensively utilized in industries where corrosion resistance and mechanical strength are paramount. In chemical and petrochemical plants, they are essential for pipelines transporting acids, alkalis, chlorides, and other harsh chemicals. The oil and gas sector relies on them in refineries, offshore platforms, and subsea pipelines. Their exceptional seawater resistance makes them ideal for marine applications. Additionally, power generation facilities use them in heat exchangers, condensers, and high-temperature piping systems, showcasing their remarkable mechanical properties.
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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