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At Rinku Fasteners, based in the vibrant city of Kolkata, dedication to precision engineering is at the heart of everything we create. As a trusted manufacturer and supplier, we craft Super Duplex Steel Washers that meet the demanding needs of modern industries. Our team blends technical expertise with a human touch, ensuring every washer reflects consistency, reliability, and thoughtful craftsmanship. With an emphasis on quality and long-term performance, we aim to support businesses that rely on robust fastening solutions designed to withstand challenging environments.
Super Duplex Steel Washers are engineered from a balanced mixture of chromium, molybdenum, and nitrogen, giving them exceptional resistance to pitting, crevice corrosion, and stress-related cracking. Their dual-phase microstructure delivers impressive mechanical strength and toughness, even in high-pressure or corrosive atmospheres. These washers exhibit high yield strength, excellent fatigue resistance, and remarkable structural stability across temperature variations. The combination of strong metallurgical composition and dependable mechanical properties makes them a preferred choice for applications where durability and reliability are non-negotiable.
| 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 washers are used for many high-performance applications. In chemical processing, they efficiently control the interaction with corrosive chemicals and high pressure. In marine environments, they do not corrode in sea water, hence, they provide long service to the equipment. In the oil and gas industry, they offer safe and effective sealing and spacing where stress is high. In addition, Super Duplex Steel washers are applied in power generation and construction industries due to their high performance in harsh conditions.
Super Duplex Steel Washers play an essential role in environments where both strength and corrosion resistance are critical. They are widely used in offshore platforms, desalination plants, chemical processing units, and marine engineering systems. Their ability to endure aggressive chloride-rich conditions makes them ideal for pumps, valves, heat exchangers, and high-pressure piping assemblies. In structural frameworks, they help maintain joint integrity under heavy mechanical loads. Engineers and project managers value these washers for contributing to secure, long-lasting connections that uphold safety and performance, even in the most demanding industrial settings.
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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