Reheating quenched steel to a certain temperature and then using a certain method for cooling is called tempering. Its purpose is to eliminate the internal stress generated by quenching, reduce hardness and brittleness, and achieve the expected mechanical properties. Tempering can be divided into three categories: high temperature tempering, medium temperature tempering, and low temperature tempering. Tempering is often used in conjunction with quenching and normalizing Quenching and tempering treatment: The heat treatment method of high-temperature tempering after quenching is called quenching and tempering treatment. High temperature tempering refers to tempering between 500-650 ℃. Quenching and tempering can greatly adjust the properties and materials of steel, with good strength, plasticity, and toughness, and good comprehensive mechanical properties Aging treatment: In order to eliminate changes in size and shape of precision measuring tools, molds, and parts during long-term use, the workpiece is often reheated to 100-150 ℃ after low-temperature tempering (low-temperature tempering temperature 150-250 ℃) before finishing, and maintained for 5-20 hours. This treatment is called aging to stabilize the quality of precision parts. It is particularly important to perform aging treatment on steel 41140 components under low temperature or dynamic load conditions to eliminate residual stress, stabilize steel structure and size.
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