Tempering is a heat treatment process where quenched metal is reheated to a certain temperature below the lower critical temperature, held at this temperature for a period of time, and then cooled. The purpose of this process is to eliminate residual stresses generated during hardening, reduce the hardness and strength of the metal, and improve the material's ductility and toughness. This process represents the tempering of 1 kg of steel, corresponding to 0.997 kg of steel after tempering. This process should be used in conjunction with production data for 1 kg of steel. The data originates from the production processes of bearings, steel shot, shear blades, rolls, and other electromechanical equipment attachments.