Home > Duplex Steel > Duplex Steel S31803 Tube Fittings
Paul Tube Fittings, based in Houston, USA, is a reliable manufacturer and supplier of robust and high-performance Duplex Steel S31803 Tube Fittings. Crafted from duplex stainless steel grade S31803, these fittings are celebrated for their remarkable blend of strength and resistance to corrosion. Designed to excel in challenging fluid and gas systems, S31803 tube fittings are perfect for applications in chemical processing, offshore platforms, power plants, and marine settings. Paul Tube Fittings provides a comprehensive selection of configurations, including elbows, unions, tees, and adapters, ensuring secure, leak-proof connections even in high-pressure and corrosive environments.
Duplex Steel S31803 Tube Fittings consist of about 22% chromium, 5–6.5% nickel, and 3% molybdenum, along with some nitrogen and manganese. This unique duplex microstructure delivers double the strength of standard austenitic stainless steels and outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. With a typical tensile strength ranging from 620 to 800 MPa, these fittings maintain excellent mechanical performance even in extreme conditions. Paul Tube Fittings guarantees precision machining and a superior surface finish for tight, vibration-resistant seals, making S31803 fittings perfect for harsh chemical environments and demanding mechanical applications.
| 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 Paul Tube Fittings, we are the largest supplier, manufacturer, and exporter of Duplex Steel S31803 Tube Fittings in Houston, USA. Our advanced manufacturing facilities, strategically positioned in the USA, 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 find extensive use in industries where exceptional mechanical strength and corrosion resistance are crucial. They are commonly applied in offshore oil and gas operations, desalination facilities, petrochemical processing, marine piping systems, and paper and pulp mills. The S31803 tube fittings from Paul Tube Fittings are particularly well-suited for environments rich in chlorides and high-pressure systems. Their dual-phase microstructure ensures a long service life, making them a reliable choice for various demanding applications.
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