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What is annealing

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 Annealing is a process of heat treatment of metals, in which a metal is slowly heated to a certain temperature, held for enough time, and then cooled at a suitable rate.The purpose is to reduce the hardness, improve the machinability;Eliminate residual stress, stabilize size, reduce deformation and crack tendency;Refining grain, adjusting structure and eliminating defects.Precisely speaking, annealing is a kind of heat treatment process for materials, including metallic materials and non-metallic materials.Moreover, the purpose of annealing of new materials is similar and different from that of traditional metal annealing.