Machuca Fittings, located in Kuala Lumpur, Malaysia, has earned a solid reputation as a reliable manufacturer and supplier of Duplex Steel S31803 Pipe Fittings. They specialize in providing high-performance, corrosion-resistant solutions tailored for tough industrial environments. Their impressive lineup features elbows, tees, reducers, caps, and crosses, all meticulously engineered to guarantee leak-proof connections, robust mechanical strength, and lasting durability.
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
These Duplex Steel S31803 Pipe Fittings are made up of around 22% chromium, 5–6% nickel, 3% molybdenum, 0.14–0.20% nitrogen, and trace amounts of manganese, silicon, and carbon. This unique composition offers exceptional resistance to corrosion caused by chlorides and oxidizing agents while maintaining impressive mechanical strength. The dual-phase microstructure provides excellent toughness, ductility, and stability even under thermal and mechanical stress. With their good weldability, formability, and durability, S31803 pipe fittings are designed to perform reliably in high-pressure, high-temperature, and chemically 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 % |
Machuca Fittings is a leading supplier of Duplex Steel S31803 Pipe Fittings in Kuala lumpur, Malaysia. 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 Machuca 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 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 that demand corrosion resistance, strength, and long-lasting durability. In chemical and petrochemical facilities, they are commonly found in pipelines transporting acids, alkalis, chlorides, and other corrosive substances. The oil and gas sector employs them in refineries, offshore platforms, and subsea piping systems. Their excellent resistance to seawater makes them ideal for marine applications, while power generation plants use them in heat exchangers, condensers, and high-temperature piping systems. The combination of mechanical strength and corrosion resistance makes these fittings a top choice for various demanding applications.
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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