Hardening is a heat treatment process in which metal is heated to above the critical temperature, held for a period, and then cooled at a rate faster than the critical cooling speed, thereby achieving a transformation in the metal's microstructure. This process represents the hardening of 1 kg of steel, corresponding to 0.99876 kg of hardened steel. This process should be used in conjunction with production data for 1 kg of steel. The data originates from the production processes of bearings, sprockets, steel shot, shear blades, rollers, bandsaw blades, and other electromechanical equipment accessories.