Open Fire Sub-Critical Annealing
Sub-Critical Annealing refers to a variety of processes that resultin a softer metal. It is a heat treatment wherein a material is altered, changing its properties such as strength and hardness. It is a process that produces the right conditions by heating to above the re-crystallization temperature and maintaining a suitable temperature, then cooling. Annealing is used to induce ductility, soften material, relieve internal stresses, refine the structure by making it homogeneous, and improve cold working properties. NATIONAL HEAT TREAT has 2 furnaces for Sub-Critical Annealing.