Home > Duplex Steel > Duplex Steel S31803 Coils
Welcome to Okoye Nickel Alloys, your trusted partner in Kinshasa for premium materials that stand up to the toughest challenges. We specialize in supplying high-performance alloys like the Duplex Steel S31803 Coil, a material engineered for resilience. Recognized for its exceptional strength and corrosion resistance, this alloy is an ideal choice for demanding industrial and marine environments across the Congo, providing reliable, long-lasting performance where it matters most. We are proud to deliver quality and expertise right here at home.
Duplex Steel S31803 is a carefully balanced alloy, primarily composed of chromium, nickel, molybdenum, and nitrogen. This unique composition gives it a mixed ‘duplex’ microstructure, which translates directly into superior mechanical properties. It offers roughly double the yield strength of standard austenitic stainless steels, along with excellent toughness and impressive resistance to stress corrosion cracking, making it a robust and dependable material for critical applications.
Standard ASTM A240 / ASME SA240
Range 5mm To 150mm
Width 1000mm / 1219mm /1250mm / 1500mm / 2000mm
Length 2000 mm / 2440 mm / 2500 mm / 3000 mm / 6000 mm.
Surface Finishing Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated)
Form Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc.
| 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 |
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| S31803 | 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
At Okoye Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel S31803 Coils 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 versatility of Duplex Steel S31803 Coil makes it indispensable across numerous sectors. It is widely used in the construction of chemical processing plants, offshore oil and gas platforms, and desalination units where its resistance to chlorides is vital. You’ll also find it in pulp and paper production, marine components, and structural applications in aggressive environments. Its combination of strength and durability helps projects in the Congo and beyond achieve greater longevity and safety, reducing maintenance needs over time.
