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Okoye Nickel Alloys is a leading manufacturer and supplier of Super Duplex Steel Nuts in Kinshasa, Congo. Our Super Duplex Steel Nuts are engineered to provide exceptional strength and durability, making them ideal for high-stress and corrosive environments. With superior resistance to pitting, crevice corrosion, and stress corrosion cracking, these nuts are essential for applications in the oil and gas industry, chemical processing, and marine sectors. Okoye Nickel Alloys is committed to delivering top-quality products that meet international standards, ensuring reliable performance in critical operations. Our dedication to precision and quality makes us a trusted partner for industries demanding high-performance fastening solutions.
| Standard | : | ASTM A193 / A479, ASME SA193 / A479 |
| Dimension | : | ASTM,DIN, BS,GB, IS and all International Standards |
| Length | : | 3 mm to 200 mm |
| Nut Size | : | M02 to M33 | Custom Sizes |
| Heat Treatment | : | Annealing, Stress Relieving, Case Hardening, Quenching and Tempering. |
| Type | : | Hex Nut, Heavy Hex Nut, Lock Nut, Nylock Nut, Weld Nut, Dome Nut, Flange Nut, Square Nut, Eye Nut etc. |
| C | Cr | Ni | Mo | N | Others |
|---|---|---|---|---|---|
| 0.020 | 25 | 7 | 4.0 | .27 | S=0.001 |
| Ultimate Tensile Strength, ksi | 116 min. |
|---|---|
| 0.2% Offset Yield Strength 0.2%, ksi | 80 min. |
| 0.1% Offset Yield Strength 0.2%, ksi | 91 min. |
| Elongation in 2 inches, % | 15 min. |
| Hardness Rockwell C | 32 max. |
| Impact Energy, ft.-lbs. | 74 min. |
The primary ingredients of **Super Duplex Steel Nuts** include chromium (24–26%), nickel (6–8%), molybdenum (3–5%), and nitrogen (0.2–0.3%), with iron making up the rest. This unique dual-phase microstructure, combining austenite and ferrite, strikes an impressive balance between strength and corrosion resistance. These nuts boast a tensile strength of about 750–800 MPa and a yield strength of roughly 550 MPa. They are highly resistant to pitting, crevice corrosion, and chloride stress corrosion cracking, while also offering excellent toughness, fatigue strength, and stability, even under high-temperature and high-pressure conditions.
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**Super Duplex Steel Nuts** are widely utilized in industries that demand exceptional corrosion resistance and robust mechanical strength. They are particularly suited for offshore oil and gas drilling platforms, desalination plants, and chemical processing facilities that face harsh conditions. In the marine and shipbuilding industries, these nuts ensure reliable fastening in seawater and salt-laden environments. Additionally, they are employed in heat exchangers, pressure vessels, paper and pulp mills, and power generation systems. Their durability, strength, and resistance to chemical attacks make them the go-to choice for critical and long-lasting industrial applications.
