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Super Duplex Steel Bolts are crafted to deliver exceptional performance in environments where strength, corrosion resistance, and durability are critical. These bolts combine the benefits of austenitic and ferritic stainless steels, offering superior resistance to pitting, crevice corrosion, and stress corrosion cracking. Their high mechanical strength allows them to withstand extreme pressures and harsh atmospheric conditions, making them a dependable choice for demanding applications. Whether used in offshore structures, chemical processing facilities, or marine engineering, these bolts provide long-lasting, stable performance that supports the reliability and safety of critical operations.
Super Duplex Steel Bolts feature a balanced mix of chromium, molybdenum, nitrogen, and nickel, giving the alloy its exceptional corrosion resistance and strength. This composition results in extremely high tensile and yield strength compared to standard stainless steels. The bolts exhibit excellent toughness, remarkable fatigue resistance, and superior stability under high-pressure or high-temperature conditions. Their duplex microstructure ensures enhanced resistance to chloride-induced corrosion, making them ideal for aggressive environments. Super Duplex Steel also maintains good weldability and structural integrity, even during prolonged exposure to demanding mechanical loads.
| 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 are widely used across industries that require fasteners capable of withstanding severe operating conditions. They are commonly installed in offshore platforms, subsea equipment, desalination plants, and marine engineering systems due to their excellent resistance to chloride-rich environments. Chemical and petrochemical industries rely on these bolts for reactors, pressure vessels, heat exchangers, and piping assemblies. Their strength and corrosion resistance also make them suitable for power generation, wastewater treatment, and structural applications. Wherever superior durability and reliability are needed, Super Duplex Steel Bolts provide secure fastening solutions that enhance equipment safety and longevity.
Rinku Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kolkata, India, with over 8 years of experience serving global industries.
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