Annealing of Fastener Steel Wire
Heating steel to a certain temperature and holding it for a period of time, and then letting it slowly cool is called annealing. Annealing of steel is a heat treatment method in which the steel is heated to the temperature of phase transition or partial phase transition, and then cooled slowly after heat preservation. The purpose of annealing is to eliminate the defects of the structure, improve the structure to homogenize the composition and refine the grain, improve the mechanical properties of the steel, reduce the residual stress; At the same time, it can reduce hardness, improve plasticity and toughness, and improve machining performance. Therefore, annealing is not only to eliminate and improve the organization defects and internal stress left by the previous process, but also to prepare for the subsequent process, so annealing is a semi-finished heat treatment, also known as pre-heat treatment.
