Tempering is a heat remedy, applying cooling at a correct pace. After performing quench hardening, the fabric is heated again, then, tempering is applied. Quenching is applied to regulate hardness, to add toughness, and to relieve inside stress. There are two types of tempering, one is high-temperature tempering, and the opposite is low-temperature tempering. Applying the tempering at greater temperature, the extra toughness is obtained, though the hardness decreases. For induction hardening or carburizing, the require tempering performed after surface-hardening therapy is, low-temperature tempering. Taking benefit of the core competency in warmth treatment technology, BGL began developing furnaces since 1978.…