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From the heart of Kinshasa, Okoye Nickel Alloys stands as a dedicated manufacturer and supplier of high-performance materials, with a specialized focus on Duplex Steel Pipe. We understand that the demanding environments across the Congo require solutions that combine strength with exceptional resistance, which is precisely what our Duplex Steel products deliver. Our commitment is to provide local industries with reliable, superior-quality piping that not only meets rigorous international standards but also supports the robust growth and infrastructure development of our region with steadfast integrity and expertise.
The strength of Duplex Steel Pipe comes from its balanced composition, primarily blending chromium, nickel, molybdenum, and nitrogen. This unique recipe gives it a mixed microstructure that combines the best features of both austenitic and ferritic steels, resulting in outstanding resistance to stress corrosion cracking. Mechanically, it offers remarkably high strength and toughness, often double that of standard austenitic grades, along with good ductility and impact strength, making it a robust choice for demanding structural and pressure-containing applications.
| Specifications | Cr | Ni | Mo | N | Mn | W | Cu |
| 2101 LDX | 21.5 | 1.5 | 0.3 | 0.22 | 5 | – | – |
| DX2202 | 23 | 2.5 | 0.3 | 0.2 | 1.5 | – | – |
| RDN 903 | 20 | 1.8 | 0.2 | 0.11 | 4.2 | – | – |
| 2304 | 23 | 4.8 | 0.3 | 0.10 | – | – | – |
| 2205 | 22 | 5.7 | 3.1 | 0.17 | – | – | – |
| Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | N | Cu |
| S31803 | 0.03 | 2.00 | 0.03 | 0.02 | 1.00 | 4.5–6.5 | 21.0–23.0 | 2.5–3.5 | 0.08–0.20 | – |
| S32205 | 0.03 | 2.00 | 0.03 | 0.02 | 1.00 | 4.5–6.5 | 22.0–23.0 | 3.0–3.5 | 0.14–0.20 | – |
| S32750 | 0.03 | 1.20 | 0.035 | 0.02 | 0.80 | 6.0-8.0 | 24.0-26.0 | 3.0-5.0 | 0.24-0.32 | 0.5 |
| Mechanical properties | Tensile,min,ksi[MPa] | Yield,min,ksi[MPa] | Elongation,%(min) | Hardness,HB(max) |
| S31803 | 90 [620] | 65 [450] | 25 | 290 |
| S32205 | 95 [655] | 65 [450] | 25 | 290 |
| S32750 | 116 [800] | 80 [550] | 15 | 300 |
At Okoye Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel Pipe 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.
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Duplex Steel Pipe is invaluable in situations where both superior strength and corrosion resistance are non-negotiable. It is extensively used in the oil and gas industry for pipelines and process piping, as well as in chemical and petrochemical plants handling aggressive substances. Its reliability also makes it ideal for offshore and marine applications, water treatment facilities, and pulp and paper production. Essentially, wherever equipment faces a combination of high pressure, corrosive chemicals, or challenging environmental conditions, Duplex Steel Pipe provides a durable and long-lasting solution.
