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Duplex Bolts

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Duplex Bolts

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  1. Duplex Bolts

  2. Introduction to Duplex Bolts Duplex fasteners are made from austenitic-ferritic stainless steels that contain equal proportions of austenite and ferrite, resulting in superior mechanical strength and enhanced corrosion resistance. This unique composition makes duplex fasteners ideal for demanding applications in industries such as petrochemical, offshore, and construction, where high strength and resistance to stress corrosion cracking are crucial.

  3. Types of Duplex Bolts DSS J-Bolts Duplex Hex Bolts J-bolts are used for anchoring and fastening in concrete, providing stability and support in construction projects. Hex bolts made of duplex stainless steel are known for their high strength and corrosion resistance, ideal for structural applications. Duplex Friction Grip Bolts Duplex U-Bolts These bolts are designed to provide an enhanced grip in high-stress applications, reducing the risk of loosening due to vibrations. U-bolts feature a U-shaped design and are commonly used to secure pipes and other cylindrical objects in place.

  4. Specifications and Standards Sizes Grades Temperature Ranges Duplex fasteners are available in Common grades of duplex fasteners Duplex fasteners are suitable for various sizes including imperial (1/4" include Duplex 2205, ASTM A182 temperature ranges between -50 °C to 4") and metric (M1.2 to M48) with F51, and ASTM A182 F60, each to 300 °C, making them versatile for lengths ranging from 12mm to providing specific mechanical different industrial applications. 1200mm. properties and corrosion resistance.

  5. Chemical and Mechanical Properties Chemical Composition Duplex stainless steel typically contains 19-28% chromium for corrosion resistance. ● Nickel content ranges from 4.5-8% which enhances toughness and ductility. ● Molybdenum is present in 2-3% to improve resistance to pitting and crevice corrosion. ● Typical grades include UNS S31803 and S32205 with specific elemental limits defined. ● Mechanical Properties Yield strength for Duplex 2205 is around 448 MPa, offering superior strength. ● Tensile strength can reach up to 650-880 MPa, making them suitable for high-stress applications. ● Elongation percentage is about 25% in 50mm, indicating good ductility. ● These fasteners exhibit excellent resistance to stress corrosion cracking, enhancing reliability. ●

  6. Comparing Duplex Eye and U Bolts Duplex Eye Bolts Duplex U Bolts + Feature a loop at one end, allowing for easy attachment of a hook or rope, making them ideal for lifting applications. – Require a nut on each end for secure fastening, which may complicate installation in tight spaces. – Primarily designed for specific applications, often limiting their versatility compared to eye bolts. + Provide versatility for connecting to a single point, often used in rigging and anchoring scenarios. – May not be suitable for applications requiring quick attachment or detachment due to their threaded design. + Available in various sizes and grades, accommodating different load capacities and environmental conditions.

  7. Conclusion Duplex Bolts are essential components in various industries due to their superior mechanical strength and excellent corrosion resistance. Their unique austenitic- ferritic structure allows them to withstand harsh environments, making them ideal for applications in petrochemical plants, offshore structures, and automotive industries. Understanding the specifications and diverse types of duplex fasteners enables engineers and procurement professionals to select the right fasteners for their specific applications, enhancing safety and durability in construction and manufacturing.

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