Specialized category for heating furnaces used in heat treatment processes for metal parts. Handles heat treatment dedicated furnaces equipped with temperature control and atmosphere control functions, including quenching furnaces, tempering furnaces, annealing furnaces, carburizing furnaces, nitriding furnaces, vacuum furnaces, and atmosphere furnaces. Classified by heating methods such as electric furnaces, gas furnaces, and induction furnaces, and by processing methods such as batch-type and continuous-type. Used in manufacturing processes for automotive parts, tool steel, and machine parts aimed at hardness improvement, stress relief, and metal structure enhancement. Distinguished clearly from general industrial furnaces and heating equipment as heat treatment dedicated equipment with integrated temperature uniformity, heating rate, cooling system, and control devices.