The box-type annealing furnace is a widely used annealing equipment with a simple structure, easy manufacturing, and convenient operation.
An annealing furnace with a hood is a heat treatment equipment that heats metal workpieces under vacuum or protective atmosphere to achieve uniformized microstructure.
It is primarily used for the quenching and tempering processing of various alloy steels and cast irons, as well as for the solution treatment and aging hardening processing of certain non-ferrous metals (such as aluminum).

Annealing process: During heating, metallic workpieces experience plastic deformation due to restricted internal thermal expansion; when the temperature exceeds the transformation temperature, internal stresses arise from different cooling rates between the inner and outer layers, causing structural changes (solid-state phase transformation); upon cooling to room temperature, certain plastic deformation occurs due to elastic recovery.