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Super Duplex Steel Bolts S32750 are incredibly strong and resistant to corrosion, making them perfect for tough conditions in demanding industrial settings. Made from UNS S32750, also known as SAF 2507, these bolts are part of the super duplex stainless steel family, which cleverly combines austenitic and ferritic phases to deliver outstanding strength and impressive corrosion resistance. They excel at fending off pitting, crevice corrosion, and stress corrosion cracking, especially in environments rich in chlorides or other aggressive chemicals. With their remarkable mechanical performance and reliability, these bolts are a go-to choice for critical load-bearing connections in offshore, marine, chemical, and power generation industries.
When it comes to their chemical makeup, Super Duplex S32750 bolts typically feature 25% chromium, 7% nickel, 4% molybdenum, and nitrogen, along with small amounts of manganese, silicon, and copper. This well-balanced composition results in high tensile strength ranging from 800 to 1000 MPa and a minimum yield strength of about 550 MPa, all while maintaining excellent impact toughness, even in colder temperatures. Their impressive resistance to both corrosion and erosion under static and dynamic loads guarantees long-lasting durability and less maintenance in challenging applications.
| 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 % |
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You’ll find Super Duplex Steel Bolts S32750 being used extensively in offshore oil and gas platforms, desalination plants, chemical processing facilities, heat exchangers, and marine equipment. These bolts play a crucial role in structural assemblies, flanged joints, and pressure vessels that face high pressure, saltwater, or aggressive fluids. Their unbeatable combination of mechanical strength and corrosion resistance ensures secure fastening, a longer service life, and safety in environments where standard stainless steels might not hold up. This makes S32750 bolts a reliable choice for critical engineering projects around the globe.
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