Car-bottom heat treatment furnaces are used primarily for the heat treatment processes of large, heavy, and voluminous parts. These furnaces allow materials placed on transport carts to be easily loaded into and unloaded from the furnace. The carts are inserted into the furnace with a specific batch of materials each time, and the process is carried out. Car-bottom furnaces are commonly used in industries such as metal processing, automotive, and machinery for the heat treatment of high-volume and heavy parts. The cart-based system provides flexibility in workpiece transportation and enhances operational efficiency.