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The Fasteners Mart, Mumbai, India, is a prominent supplier and exporter of high-performance industrial fasteners with top-class solutions for mission-critical engineering applications. One of its high-end products is Super Duplex Steel Bolts with superior strength and resistance to corrosion. The bolts are produced with Super Duplex grades like S32750 and S32760, bringing together the best qualities of both austenitic and ferritic stainless steels. Coming in a range of sizes, threads, and finishes, these bolts are suited for application in harsh environments such as offshore platforms, marine facilities, and chemical processing plants.
Super Duplex Steel Bolts consist of 24–26% chromium, 6–8% nickel, 3–5% molybdenum, with added nitrogen, tungsten, and iron. They show high tensile strength (approximately 750–800 MPa), yield strength (at least 550 MPa), and good elongation (about 25%). The bolts are 7.8 g/cm³ in density and around 1350°C in melting point. Their two-phase microstructure is highly resistant to stress corrosion cracking, pitting, and crevice corrosion, especially in environments containing chlorides or close to sea. These characteristics suit heavy-duty and corrosive industrial purposes.
| 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 are extensively applied across industries where strength is high and corrosion resistance is superior. The typical uses are in offshore oil and gas platforms, subsea equipment, marine engineering, and desalination plants. They are used in heat exchangers, pressure vessels, pumps, and chemical tanks in contact with severe chemicals or seawater. Their performance under conditions of high pressure and temperature ensures long-term reliability and less maintenance. They are crucial in structural components and machinery parts demanding both mechanical integrity and corrosion resistance in harsh environments.
Fasteners Mart provides swift, safe, and reliable transportation of Super Duplex Steel Bolts to customers in both the domestic and overseas markets. All bolts are securely packed in moisture-resistant, superior quality materials for safe transit. Specialized packing, bulk packaging, and labels are available as per individual customers’ and project requirements.
The Fasteners Mart is a leading manufacturer and supplier of high-quality fasteners in Mumbai, India, with over 8 years of experience serving global industries.
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