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Technische Informationen

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  • metal heat treatment
  • 2026/4/21¡¡Reading time£º[51]
  • Metal heat treatment is a key process in mechanical manufacturing, which generally does not change the shape and overall chemical composition of the workpiece. Instead, it improves the performance of the workpiece by regulating the internal microstructure or optimizing the surface composition, with a focus on improving the internal quality. It is an important part of quality management.
    In addition to the rational selection of materials and forming processes, heat treatment is often a necessary means to ensure the mechanical, physical, and chemical properties of metal workpieces. Steel is widely used in the mechanical industry, and its structure can be controlled through heat treatment, making it the main object of metal heat treatment; Aluminum, copper, magnesium, titanium and their alloys can also obtain different properties through heat treatment.
    Heat treatment mainly includes three stages: heating, insulation, and cooling. Some processes only involve heating and cooling, and each stage is connected continuously.
    There are various heating methods, from early fuel heat sources to electric heating, which is convenient for temperature control and more environmentally friendly. The workpiece is prone to oxidation and decarburization when heated in air, which affects its surface properties. Therefore, protective atmospheres, vacuum, coatings, or packaging are often used to protect the heating. The heating temperature is a key parameter that needs to be selected based on the material and process objectives. It is usually heated above the phase transition temperature to obtain high-temperature microstructure.
    Insulation is a necessary stage for achieving uniform temperature inside and outside the workpiece and sufficient transformation of its structure; High energy density heating and surface heat treatment often have no insulation, while chemical heat treatment has a relatively longer insulation time.
    Cooling is an important step to ensure the effectiveness of heat treatment, and the core is to control the cooling rate. Annealing cooling is the slowest, normalizing is faster, quenching is faster, and different steel grades have corresponding requirements for cooling speed.