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The hardness and wear resistance of Carbon Steel Concrete Screw are improved, and heat treatment process is one of the core links. Heat treatment significantly improves its mechanical properties by changing the internal structure of the material. Quenching is the first step of heat treatment, the purpose of which is to heat the screw material to a high temperature state to make it completely austenitized. Austenite is a high-temperature phase with good plasticity and toughness, but low hardness. Subsequently, by rapid cooling, austenite is rapidly transformed into a high-hardness martensite structure. Martensite has high hardness and high strength, which can significantly improve the wear resistance of the screw. However, the internal stress and brittleness generated during quenching need to be eliminated by subsequent tempering treatment.
Tempering is a necessary step after quenching, the purpose of which is to adjust the hardness and toughness of the screw to achieve the best performance. The choice of tempering temperature depends on the material type and purpose of the screw. For example, quenched and tempered steel usually needs to be tempered at a high temperature of 500-650℃ to balance strength and toughness and avoid brittle fracture of the screw during use. Spring steel needs to be tempered at a medium temperature of 420-520℃ to maintain its elastic limit and ensure that the screw will not be permanently deformed when subjected to alternating loads. Since the surface of carburized steel is carburized and has a high hardness, it needs to be tempered at a low temperature of 150-250℃ to eliminate internal stress and strengthen the carburized layer to further improve wear resistance.
For screws that require higher hardness and wear resistance, carburizing or nitriding can also be used. Carburizing is to place the screw in a high-temperature carburizing medium so that carbon atoms penetrate the surface to form a high-carbon layer. Subsequently, through quenching and tempering, the high-carbon layer is transformed into a high-hardness martensitic structure, which significantly improves the surface hardness and wear resistance. Nitriding is to form a nitride layer on the surface of the screw through the decomposition of ammonia. The nitride layer has high hardness and good corrosion resistance, which can further improve the wear resistance and service life of the screw.
In addition to heat treatment, surface treatment is also an important means to improve the wear resistance of Carbon Steel Concrete Screw. The surface treatment process can form a protective layer on the surface of the screw, directly enhancing its wear resistance and corrosion resistance.
Oxidation treatment is a process that forms an oxide layer on the surface of the screw by chemical or thermal oxidation. The oxide layer is usually silver-gray and has a certain hardness and wear resistance. When running at high speed, the oxide layer can reduce the friction loss between the screw and the contact surface, while providing basic corrosion resistance. The oxidation treatment process is simple and low-cost, and is suitable for occasions where wear resistance is not particularly high.
Plating and coating technology is an important means to improve the surface performance of screws. Electroplating or chemical plating processes such as zinc plating and nickel plating can form a metal protective layer on the surface of the screw. These metal layers have good wear resistance and corrosion resistance, which can significantly increase the service life of the screw. In addition, wear-resistant coatings are also a common surface treatment method. These coatings are covered on the surface of the screw by spraying to form a hard and wear-resistant protective layer. Wear-resistant coatings can resist various wear and corrosion, and are particularly suitable for use in high-load, high-wear or harsh environments.
