Heat Treatment Material TraysIn the field of heat treatment technology, this innovation includes the first load-bearing plate and the second load-bearing plate. The first load-bearing plate is used for storing tubular workpieces; the second load-bearing plate is inserted into the first load-bearing plate for storing block-shaped workpieces. The heat treatment tray provided by this utility model, featuring the second load-bearing plate for storing block-shaped workpieces, can be inserted into the first load-bearing plate designed for storing tubular workpieces, allowing for the storage of both block-shaped and tubular workpieces. Furthermore, with this structure, the modular design of the heat treatment tray is achievable, offering flexibility in use.