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The 10.9s large hexagon bolt connection pair with half – thread and Dacromet galvanization predominantly uses high – strength alloy steel as the base material. The “10.9s” grade indicates that these bolts meet specific mechanical property requirements.
Description
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Product Material
The 10.9s large hexagon bolt connection pair with half - thread and Dacromet galvanization predominantly uses high - strength alloy steel as the base material. The “10.9s” grade indicates that these bolts meet specific mechanical property requirements. The alloy steel contains elements such as chromium, molybdenum, and vanadium, which can be heat - treated to achieve excellent mechanical properties. After heat treatment, 10.9s bolts possess high tensile strength (minimum 1000 MPa), yield strength (minimum 900 MPa), and good toughness, enabling them to withstand heavy loads and complex mechanical stresses in various engineering applications.
The Dacromet galvanization is a key feature of the surface treatment. Dacromet coating is mainly composed of zinc flakes, aluminum flakes, chromates, and organic binders. This unique combination forms a dense, uniform, and adherent film on the bolt surface, providing superior corrosion resistance compared to traditional galvanization methods.
Product Models
The product line of 10.9s large hexagon bolt connection pairs with half - thread and Dacromet galvanization includes various models categorized by size, length, and specific application requirements:
Standard Metric Models: Available in a wide range of metric sizes, the diameters of these bolts typically range from M12 to M36. The length can vary from 50mm to 300mm or more, depending on the actual needs of different projects. Standard models follow the relevant national and international standards for large hexagon bolts, ensuring compatibility with standard nuts and washers. The half - thread design, where the threads cover only part of the bolt shank, is optimized for applications that require a balance between load - bearing capacity and reduced friction during installation.
High - Load - Capacity Special Models: For particularly heavy - duty projects, such as large - scale industrial plants, long - span bridges, and high - rise building structures, high - load - capacity special models are available. These bolts may have larger diameters and thicker hex heads, and their length specifications can be customized according to the specific structural design. They are designed to handle extremely high tensile and shear forces, ensuring the stability and safety of critical structural connections.
Corrosion - Resistant Enhanced Models: In addition to the basic Dacromet galvanization, some models may undergo additional anti - corrosion treatments or use special formulations of Dacromet coating. These corrosion - resistant enhanced models are specifically developed for harsh environments, such as coastal areas, chemical plants, and regions with high air pollution. They can provide long - term protection against severe corrosion, extending the service life of the bolt connection pairs in these challenging conditions.
Manufacturing Process
The production of 10.9s large hexagon bolt connection pairs with half - thread and Dacromet galvanization involves multiple precise steps and strict quality - control measures:
Material Preparation: High - quality alloy steel raw materials are carefully sourced. Rigorous inspections are carried out on the chemical composition, mechanical properties, and surface quality of the steel to ensure compliance with the 10.9s grade requirements and relevant standards. The steel bars or rods are then cut into appropriate lengths according to the specified bolt sizes.
Forming: The alloy steel is formed into the characteristic large hexagon head and bolt shank through cold - heading or hot - forging processes. Cold - heading is usually applied to smaller - sized bolts, which is efficient for mass production and can accurately form the bolt shape while maintaining dimensional accuracy. Hot - forging is used for larger - diameter or high - strength bolts. In this process, the steel is heated to a malleable state and then shaped under high pressure to obtain the required strength and precise dimensions.
Threading: After forming, the bolts undergo threading operations. For the half - thread design, threads are precisely rolled or cut on the designated part of the bolt shank. Thread rolling is the preferred method as it strengthens the thread by cold - working the metal, improving the fatigue resistance of the bolts. Specialized threading dies are used to ensure that the thread pitch, profile, and dimensions meet the standard requirements, guaranteeing proper matching with nuts.
Heat Treatment: To achieve the 10.9s grade mechanical properties, the formed bolts are subjected to a series of heat - treatment processes, including annealing, quenching, and tempering. Annealing softens the steel and eliminates internal stress; quenching increases the hardness and strength; and tempering adjusts the hardness and toughness to the optimal level, ensuring that the bolts have excellent comprehensive mechanical properties.
Dacromet Coating Application: First, the bolts are thoroughly cleaned to remove any contaminants, oil, or scale on the surface. Then, they are immersed in a Dacromet solution or coated by spraying, which evenly distributes the solution containing zinc flakes, aluminum flakes, chromates, and binders on the bolt surface. After coating, the bolts are cured at a high temperature (usually around 300°C). During the curing process, the components of the Dacromet solution react to form a dense, corrosion - resistant coating with excellent adhesion to the alloy steel substrate.
Assembly and Quality Inspection: The bolts are paired with corresponding nuts and washers to form connection pairs. Every batch of products is subject to strict quality inspection. Dimensional checks are performed to ensure that the diameter, length, thread specifications, and head size of the bolts and nuts meet the standards. Mechanical tests, such as tensile strength, proof load, and torque - tension tests, are carried out to verify the load - bearing capacity and performance of the bolt connection pairs. Visual inspections are also conducted to check for surface defects, proper Dacromet coating coverage, and any non - compliance with appearance requirements. Only products that pass all quality tests are approved for packaging and delivery.
Surface Treatment Process
The Dacromet galvanization surface treatment endows the bolts with outstanding performance:
Pre - treatment: Before Dacromet coating, the bolts are pre - treated to ensure good adhesion of the coating. This pre - treatment process includes degreasing, where the bolts are cleaned with solvents or alkaline solutions to remove oil, grease, and other organic contaminants. Then, pickling is carried out using an acid solution to remove rust, scale, and inorganic impurities from the surface. After pickling, the bolts are rinsed thoroughly to eliminate residual acid, and finally, they are dried to prepare for the Dacromet coating.
Dacromet Coating Process: There are mainly two methods for applying Dacromet coating: immersion and spraying. In the immersion method, the pre - treated bolts are completely immersed in the Dacromet solution, allowing the solution to fully cover the surface. In the spraying method, the Dacromet solution is sprayed evenly onto the bolt surface using spraying equipment. After coating, the bolts are placed in an oven for curing. During the curing process, the water in the Dacromet solution evaporates, and the zinc flakes, aluminum flakes, chromates, and binders react chemically to form a continuous, dense, and stable coating with a thickness of about 5 - 15 microns.
Post - treatment: In some cases, post - treatment may be carried out after Dacromet coating. This can include passivation treatment with special chemicals to further enhance the corrosion resistance of the coating, or applying a topcoat to improve the abrasion resistance and appearance of the surface. Post - treatment helps to optimize the performance of the Dacromet - coated bolts and adapt them to different application requirements.
Application Scope
10.9s large hexagon bolt connection pairs with half - thread and Dacromet galvanization are widely used in various important engineering and construction fields:
Building Construction: In large - scale building projects, especially high - rise buildings and steel - structure buildings, these bolt connection pairs are used for connecting steel beams, columns, and trusses. Their high strength ensures the stability and load - bearing capacity of the building structure, while the Dacromet galvanization provides long - term protection against corrosion, even in indoor environments with potential moisture or outdoor environments exposed to the atmosphere.
Bridge Engineering: Bridges are exposed to complex environmental conditions, including traffic - induced vibrations, moisture, and corrosive substances. These bolt connection pairs play a crucial role in connecting bridge components, such as girders, piers, and bridge decks. The 10.9s high - strength grade enables them to withstand heavy loads and vibrations, and the excellent corrosion resistance of the Dacromet coating ensures the long - term safety and durability of the bridge structure.
Industrial Equipment Installation: In industrial plants, they are used for assembling heavy machinery, equipment frames, and large - scale industrial structures. Whether it is in the petrochemical, power generation, or manufacturing industries, these bolt connection pairs can firmly connect various components, ensuring the stable operation of industrial equipment. The half - thread design is beneficial for adjusting the installation position and reducing the installation torque in some complex assembly situations.
Infrastructure Projects: For large - scale infrastructure projects, such as airports, ports, and railway stations, these bolt connection pairs are used in the construction of steel - structure roofs, large - span frameworks, and other key parts. Their high - strength and corrosion - resistant properties meet the strict requirements of infrastructure projects for reliability and durability, contributing to the long - term use and safety of these important infrastructure facilities.
Product Advantages
High - Strength and Reliable Fastening: With a 10.9s strength grade, these bolt connection pairs have high tensile strength, yield strength, and fatigue resistance. They can firmly connect structural components and withstand heavy loads, vibrations, and shear forces, ensuring the stability and safety of engineering structures. The half - thread design also optimizes the load - bearing performance in specific applications, providing a reliable fastening solution for various construction and industrial projects.
Superior Corrosion Resistance: The Dacromet galvanization provides excellent corrosion resistance. The unique composition of the Dacromet coating forms a dense protective film that effectively isolates the base metal from the corrosive environment. It can resist the erosion of moisture, salt, and chemicals, significantly extending the service life of the bolts compared to traditional galvanized bolts. This makes them particularly suitable for use in harsh environments where corrosion is a major concern.
Good Compatibility and Standardization: These bolt connection pairs comply with relevant national and international standards for large hexagon bolts. They have good compatibility with standard nuts and washers, facilitating procurement, installation, and replacement. The standardized design also simplifies the construction process, reduces the possibility of installation errors, and improves construction efficiency.
Long - Term Stable Performance: Through strict manufacturing processes and quality control, including precise heat treatment and high - quality Dacromet coating, these bolt connection pairs maintain stable mechanical and anti - corrosion performance over a long period. They can operate reliably under various complex working conditions without significant performance degradation, reducing maintenance costs and ensuring the long - term normal operation of projects.
Environmentally Friendly: Compared with some traditional anti - corrosion treatments that may produce harmful substances, the Dacromet coating process is relatively environmentally friendly. It contains less heavy metal content and does not produce a large amount of waste during the production process, meeting the requirements of modern engineering construction for environmental protection.
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