Home > Duplex Steel > Duplex Steel S31803 Flanges
Okoye Nickel Alloys stands as a trusted partner for industry in Kinshasa, supplying robust materials built for the demanding conditions of our region. We specialize in providing high-performance Duplex Steel S31803 Flanges, offering a reliable solution for projects where strength and corrosion resistance are non-negotiable. Our commitment is to deliver not just a product, but a foundation of durability and resilience, ensuring your critical piping systems operate with integrity and longevity, supporting the progress of Congo’s vital industries.
These flanges are crafted from a meticulously balanced composition of chromium, nickel, molybdenum, and nitrogen. This unique blend gives S31803 its “duplex” nature, combining the best attributes of both austenitic and ferritic steels. The result is a material with exceptional mechanical strength, significantly higher than standard stainless steels, alongside outstanding toughness and excellent resistance to stress corrosion cracking, making it a superior choice for high-pressure environments.
| Specifications | ASTM A182 / ASME SA182 |
| Size | 1/8″ NB TO 48″ NB |
| Standards | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Grades | S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 |
| 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 |
| 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 Okoye Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel S31803 Flanges in Kinshasa, Congo, providing cutting-edge solutions for all your piping needs. Our state-of-the-art production plants are strategically located in the Congo, allowing us to maintain a vast inventory of over 16,000 tons of premium-quality materials readily available in stock. We are dedicated to delivering superior products and services, ensuring reliability and excellence for our global clientele.
Contact us to get a quick quote for your requirement.
The remarkable properties of Duplex Steel S31803 Flanges make them ideal for a wide spectrum of challenging applications. You will commonly find them performing reliably in the demanding environments of oil and gas extraction, particularly in handling aggressive produced water. They are also extensively used in chemical processing plants for managing corrosive acids and alkalis, in marine and offshore systems battling seawater corrosion, and in power generation facilities, including water desalination units, where their longevity under stress is a critical advantage.
