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Bilal Fasteners is a well-known manufacturer and supplier of Super Duplex Steel bolts located in Jakarta, Indonesia. They’ve built a reputation for crafting high-strength, corrosion-resistant fasteners that cater to vital industries like offshore, petrochemical, and marine engineering. These Super Duplex Steel bolts are created from a high-performance alloy featuring a dual-phase microstructure—ferrite and austenite—offering exceptional mechanical strength and remarkable corrosion resistance, particularly in environments rich in chlorides and acids. With cutting-edge manufacturing processes and rigorous quality checks, Bilal Fasteners ensures their Super Duplex bolts comply with global standards like ASTM A193 and UNS S32750/S32760, guaranteeing durability even in the toughest industrial settings.
Super Duplex Steel bolts, generally produced from grades UNS S32750 or S32760, consist of about 24–26% chromium, 6–8% nickel, and 3–5% molybdenum, along with some nitrogen and manganese. This carefully balanced composition provides them with impressive resistance to pitting, crevice corrosion, and stress corrosion cracking. These bolts boast excellent mechanical strength, with tensile strength ranging from 750 to 850 MPa and yield strength exceeding 550 MPa. They also maintain remarkable toughness and fatigue resistance, even in sub-zero temperatures. Their high PREN (Pitting Resistance Equivalent Number) value—usually above 40—makes them perfect for extreme and corrosive service 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.
Super Duplex Steel bolts that are used in many high performance industries. In chemical processing, they are able to cope with the attack of aggressive chemicals and high pressures. In marine applications, they are able to withstand the effects of saltwater thus are long lasting. In the oil and gas industry, they offer secure fastening where there is high stress. Furthermore, Super Duplex Steel bolts are applied in power generation and construction because of their ability to withstand harsh conditions.
Super Duplex Steel bolts find extensive use in harsh and corrosive environments, including offshore oil rigs, subsea pipelines, desalination plants, and chemical processing facilities. They play a crucial role in marine structures, pressure vessels, heat exchangers, and high-performance pumps and valves, where both strength and corrosion resistance are paramount. Their ability to resist chloride-induced stress corrosion cracking makes them particularly suitable for seawater applications.
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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