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Elastic pin couplingFracture appears in the cross section: This defect destroys the chemical composition and uniformity of the structure of the steel, reduces the quenching hardness, and deteriorates the mechanical properties.At the same time, it will also reduce the plasticity and toughness of the steel, making the turning size unstable and the tool wear.The successive changes of metallographic structure caused by heating also cause stress, which is called tissue stress.Overheating is not conducive to heat treatment, making steel brittle and reducing mechanical properties, but it can be normalized or annealed after forging.