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Super Duplex Steel Washers are top-notch fasteners made from super duplex stainless steel, known for their incredible strength and outstanding resistance to corrosion, even in the harshest environments. These washers are specifically designed for critical applications where high mechanical stress, extreme temperatures, and exposure to chlorides, acids, or seawater are everyday challenges. By blending the advantages of both austenitic and ferritic stainless steels, Super Duplex washers offer enhanced toughness, resistance to stress corrosion cracking, and a longer service life. Their impressive load-bearing capacity and durability make them perfect for structural assemblies in demanding industries.
On the chemical side, Super Duplex Steel usually contains 24–26% chromium, 6–8% nickel, 3–5% molybdenum, and nitrogen, all while keeping carbon content low. This well-balanced composition leads to a dual-phase microstructure that provides a tensile strength of about 750–850 MPa and a yield strength of 550 MPa or more. These washers excel in resisting pitting, crevice corrosion, and fatigue, even in acidic and saline conditions. They maintain their mechanical properties in both freezing and high-temperature environments, making them suitable for a variety of operating conditions.
| Standard | DIN, ASTM, BS and all International Standards |
| Specifications | ASTM A479 & ASME SA479 |
| UNS S32760 Nut and Bolts Size | M3 To M56 3/6″ to 2″ |
| Length | 3 to 200 MM |
| Super Duplex Steel 2207 Machine Screws Size | M1.6 To M12 |
| Duplex Steel 2205 Washers Size | M3 To M56 3/6″ to 2″ |
| Tensile Strength(MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) | Hardness Rockwell C (HR C) | |
| Super Duplex Steel Bolts | 760 | 550 | 15 | 32 Max |
| Phosphorus | Sulphur | Silicon | Carbon | Manganese | Nickel | Molybdenum | Nitrogen | Copper | Chromium |
|---|---|---|---|---|---|---|---|---|---|
| 0.035 % max | 0.02 % max | 0.80 % max | 0.03% Max | 1.20 % max | 6.00 – 8.00 % | 3.00 – 5.00 % | 0.24 – 0.32 % | 0.50 % max | 24.0 – 26.0 % |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
You’ll find Super Duplex Steel Washers commonly used in offshore oil and gas platforms, petrochemical processing plants, marine hardware, desalination equipment, and the chemical industry. They’re also great for power generation facilities, pressure vessels, heat exchangers, and structural joints that face tough environmental challenges. Their corrosion resistance in seawater and chloride-rich atmospheres makes them particularly valuable for coastal and submerged applications. By ensuring proper load distribution and preventing surface damage around bolted connections, Super Duplex washers deliver both structural reliability and longevity in the most demanding settings.
Bilal Fasteners is a leading manufacturer and supplier of high-quality fasteners in Indonesia, Jakarta, with over 8 years of experience serving global industries.
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