Home > Duplex Steel > Duplex Steel S31803 Tube Fittings
Jassem Tube Fittings, a trusted manufacturer and supplier in Doha, Qatar, offers high-quality Duplex Steel S31803 Tube Fittings designed for strength, corrosion resistance, and long-term reliability. These fittings are engineered to provide secure, leak-free connections in demanding piping and tubing systems. Jassem Tube Fittings combines precision manufacturing with strict quality control to meet international standards. Duplex Steel S31803 Tube Fittings are known for their excellent performance in high-pressure and corrosive environments, making them a dependable choice for industries where safety, durability, and efficiency are essential.
Duplex Steel S31803 Tube Fittings are manufactured from a dual-phase stainless steel alloy containing approximately 22% chromium, 5% nickel, and 3% molybdenum, with a balanced austenitic and ferritic microstructure. This composition provides excellent resistance to corrosion, especially chloride-induced stress corrosion cracking. Mechanically, they offer high tensile and yield strength, good toughness, and superior fatigue resistance. The duplex structure ensures stability under high pressure, vibration, and temperature variations, delivering reliable sealing and long service life.
| 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 Jassem Tube Fittings, we are the largest supplier, manufacturer, and exporter of Duplex Steel S31803 Tube Fittings in Doha, Qatar. Our advanced manufacturing facilities, strategically positioned in the Qatar, 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 widely used in industries requiring high strength and corrosion resistance. Common applications include oil and gas processing, petrochemical plants, chemical industries, offshore platforms, and power generation systems. They are also used in marine piping, desalination plants, and industrial heat exchangers. By ensuring secure and durable connections, these fittings help improve system safety, reduce maintenance, and enhance operational efficiency in critical and corrosive service environments.
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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