Home > Duplex Steel > Duplex Steel S31803 Tube Fittings
Noah Tubefittings is a reliable manufacturer and supplier of top-notch Duplex Steel S31803 Tube Fittings based in Kinshasa, Congo. They specialize in providing advanced piping solutions that adhere to global standards. With a strong focus on precision engineering and durability, the company offers a wide variety of tube fittings tailored for tough industrial settings. Noah Tubefittings guarantees excellent performance, resistance to corrosion, and a long lifespan for critical applications in sectors like petrochemicals, oil & gas, chemical processing, power generation, and marine engineering. Backed by a dedicated team and cutting-edge manufacturing facilities, Noah Tubefittings is committed to maintaining high standards, timely deliveries, and customer-centric solutions throughout the Central African markets.
Duplex Steel S31803 Tube Fittings are made up of about 21–23% Chromium, 4.5–6.5% Nickel, and 2.5–3.5% Molybdenum, along with carefully controlled amounts of Manganese, Silicon, Nitrogen, and the rest being Iron. This unique dual microstructure combines both ferrite and austenite phases, which gives it impressive strength and resistance to stress corrosion cracking caused by chlorides. S31803 is known for its excellent tensile strength, high yield strength, and outstanding fatigue resistance. It remains stable even in extreme temperatures and harsh corrosive environments, making it a great choice for high-pressure systems and aggressive chemical conditions where reliability and long-lasting durability are crucial.
| ELEMENT | DUPLEX 31803 |
| NI | 4.50 – 6.50 |
| C | 0.030 max |
| MN | 2.00 max |
| P | 0.030 max |
| S | 0.020 max |
| SI | 1.00 max |
| CR | 22.0 – 23.0 |
| MO | 3.0 – 3.5 |
| N | 0.14 – 0.20 |
| FE | 63.72 min |
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
At Noah Tube Fittings, we are the largest supplier, manufacturer, and exporter of Duplex Steel S31803 Tube Fittings in Kinshasa, Congo. Our advanced manufacturing facilities, strategically positioned in the Congo, enable us to deliver high-quality solutions to meet your specific requirements. With a robust inventory of over 16,000 tons of top-grade materials, we are well-equipped to fulfil your needs promptly. Our commitment to excellence and efficiency ensures we always have the available stock to support your demands.
| STANDARD | UNS | WERKSTOFF NR. |
| Duplex S31803 | S31803 | 1.4462 |
| Straight Union | Bulkhead Union | Reducing Union | Union Elbow | Union Cross | Union Tee |
| Male Connector | Female Connector | Male Bulkhead Connector | Female Bulkhead Connector | Male to Male Elbow | Male Elbow |
| Female Elbow | Male to Female Elbow | Male Run Tee | Male Branch Tee | Female Branch Tee | Female Run Tee |
| Male Adaptor | Female Adaptor | Tube End Reducer | OD Plug | Bulkhead Lock Nut | OD Cap |
Contact us to get a quick quote for your requirement.
Duplex Steel S31803 Tube Fittings are a go-to choice in industries where strength and top-notch corrosion resistance are a must. You’ll often find them in offshore drilling platforms, seawater cooling systems, chemical and petrochemical plants, desalination facilities, oil and gas refineries, and even in the pulp and paper sector. These fittings are perfect for high-pressure hydraulic lines, heat exchangers, instrumentation systems, and process piping that come into contact with corrosive fluids. Their impressive ability to resist pitting, crevice corrosion, and stress corrosion cracking makes them a great fit for marine engineering and wastewater treatment plants. With S31803 tube fittings, you can count on reliable performance even in the toughest, high-temperature, and high-load situations.
Please feel free to contact us if you need any further information or for enquiry.
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Standard : ASTM A276, A479 / ASME SA276, SA479
Thickness : 0.6 mm THK to 6.00 mm THK
Size Range : 1/16” 1/2” & 1.5MM to 38.1MM
Outer Diameter : 6.00 mm to 60.00 mm