Home > Duplex Steel > Duplex Steel S31803 Nuts
At Okoye Nickel Alloys, we specialize in providing premium Duplex Steel S31803 nuts, renowned for their exceptional strength and corrosion resistance. As a leading manufacturer and distributor based in Kinshasa, Congo, we cater to various industries, including marine, chemical, and industrial sectors. Our Duplex Steel S31803 nuts are engineered to withstand extreme conditions, ensuring reliable performance and durability. With a commitment to quality and customer satisfaction, we offer a comprehensive range of products to meet your specific needs. Trust Okoye Nickel Alloys for top-notch materials and unmatched service in the Congo market.
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Material
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Specification
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Standards |
Size
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Length
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Duplex Steel S31803 |
IS BS ASTM |
ASTM / ASME – A/ SA 479 / 479
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3 mm |
M02 to M30 |
| Cr | N | Ni | C | Mn | Si | P | S | Mo | |
|---|---|---|---|---|---|---|---|---|---|
| S31803 | min: 21.0 max: 23.0 | min: 0.08 max: 0.20 | min: 4.5 max: 6.5 | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 2.5 max: 3.5 |
| S32205 | min: 22.0 max: 23.0 | min: 0.14 max: 0.20 | min: 4.5 max: 6.5 | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 3.0 max: 3.5 |
Grade | Tensile Strength (MPa) min | Elongation (% in 50mm) | Yield Strength 0.2% Proof (MPa) min | Hardness Rockwell C (HR C) |
|---|---|---|---|---|
UNS-S 31803 | 650-880 | 25 | 448 | |
UNS-S 32205 | 621 | 25 | 448 | 21 max |
The composition of Duplex Steel S31803 Nuts includes around 22% chromium, 5–6% nickel, 3% molybdenum, and 0.14–0.20% nitrogen, balanced with iron. This unique blend grants them exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-rich and acidic environments. Additionally, these nuts boast high tensile and yield strength, outstanding toughness, and thermal stability, making them ideal for critical applications where both mechanical performance and corrosion resistance are vital.
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You’ll find Duplex Steel S31803 Nuts from Okoye Nickel Alloys widely utilized in piping systems, pressure vessels, chemical reactors, offshore platforms, desalination plants, and marine equipment. They’re perfect for securing bolts and components that face corrosive media, high pressure, and elevated temperatures. With a focus on precision threading, dimensional accuracy, and thorough quality testing, Okoye Nickel Alloys delivers Duplex Steel S31803 Nuts that ensure reliable fastening, a long service life, and top-notch performance even in the harshest industrial and marine conditions.
