Zain Fittings, located in Surabaya, Indonesia, has made a name for itself as a top-notch manufacturer and supplier of high-quality Duplex Steel S31803 Pipe Fittings. These fittings are celebrated for their remarkable durability, strength, and resistance to corrosion, making them perfect for demanding industrial settings. Zain Fittings is committed to ensuring that each product adheres to international quality standards, thanks to their advanced manufacturing processes and strict quality control measures. They cater to a variety of industries, including oil and gas, petrochemical, marine, and power generation, offering reliable Duplex Steel S31803 Pipe Fittings that are customized to meet various operational and environmental needs.
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 feature a unique dual-phase microstructure, which consists of roughly equal parts austenite and ferrite, providing exceptional strength and corrosion resistance. Their composition includes chromium (21–23%), nickel (4.5–6.5%), molybdenum (2.5–3.5%), along with nitrogen, manganese, silicon, and iron as the primary component. These fittings boast a tensile strength of around 620 MPa, a yield strength of 450 MPa, and an elongation of 25%. They are highly resistant to pitting, crevice corrosion, and stress corrosion cracking, while also offering good weldability and toughness across various temperature ranges.
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 Zain 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 Zain Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@zainfittings.id.
Duplex Steel S31803 Pipe Fittings are extensively utilized in scenarios where high mechanical strength and corrosion resistance are crucial. You’ll often find them in chemical processing plants, offshore oil drilling operations, desalination systems, heat exchangers, and marine engineering projects. These fittings are particularly well-suited for pipelines that transport corrosive fluids, refineries, and pressure vessels that face harsh chloride environments. Their outstanding performance, cost-effectiveness, and long service life make them a go-to choice for industries that demand reliability and stability in challenging operating conditions.
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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