One of the main reasons for heat treatment is to reduce hardness. This is particularly important for metals that are too hard and brittle, making them difficult to machine or shape. By heating the metal to a certain temperature and then cooling it down slowly, the hardness is reduced, making it easier to work with.
Heat treatment is also used to eliminate casting stress. When a metal is cast, it can develop internal stresses that can cause deformation or even cracking. By applying heat treatment, these stresses are relieved, ensuring that the finished product is stable and fit for use.
It is mainly to reduce hardness, eliminate casting stress, prevent product deformation, and facilitate cutting, such as annealing, or natural stress relief at room temperature for more than 6 months.
