Super Duplex Fasteners: Properties, Grades & Applications
Hague Fasteners have manufactured more special custom-made fasteners in Duplex and Super Duplex grades than in any other material. These alloys are chosen for their exceptional strength, corrosion resistance and reliability in demanding environments. Therefore, many industries prefer Duplex and Super Duplex grades over lean Duplex alternatives such as UNS S32101.
Why Industries Choose Super Duplex Fasteners
Super Duplex alloys offer a unique combination of high mechanical strength and excellent corrosion resistance. Moreover, they provide superior performance in chloride-rich environments where standard stainless steels may fail. As a result, they are widely used in offshore, petrochemical, subsea and high-pressure applications.
Super Duplex Alloy UNS S32750 (F53 / 1.4410 / Alloy 2507)
Outstanding Corrosion Resistance
Super Duplex Alloy UNS S32750 (F53 / 1.4410 / Alloy 2507) provides excellent corrosion resistance across a wide range of media. It offers outstanding resistance to pitting and crevice corrosion in seawater and other chloride-containing environments. For example, its Critical Pitting Temperature exceeds 50°C, making it ideal for aggressive offshore conditions.
Thermal and Mechanical Performance
UNS S32750 exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic stainless steels. Therefore, it is suitable for working temperatures up to 300°C. This combination of thermal stability and mechanical strength makes it a preferred choice for high-integrity bolting and fastener applications.
Industry Approvals and Standards
Listed in NACE MR0175 for sour service and approved by ASME for pressure vessel applications, Alloy 32750 is trusted across multiple critical sectors. Consequently, it is used in oil and gas, petrochemical, subsea, desalination and chemical processing environments.
Why Choose Hague Fasteners for Super Duplex Fasteners?
With over 50 years of UK bolt and nut manufacturing experience, Hague Fasteners are recognised as one of the most reliable producers of special fasteners in Super Duplex grades. We manufacture custom fasteners to OEM drawings, unique designs and non-standard specifications, including small batch quantities and rapid turnaround requirements.
Contact Us
If you require Super Duplex fasteners, custom bolts or non-standard components, our team is ready to help. We offer fast lead times, high-integrity materials and precision manufacturing.
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