1. Function:

1) Reduce hardness and improve plasticity;
2) Refine product particles and eliminate organizational deficiencies;
3) Eliminate internal stress;
4) Prepare the organization for quenching.

2. If not annealed, it is easy to cause uneven material distribution, and more importantly, the physical properties are not up to standard and the toughness is not enough. Small pipes are not annealed well and are prone to breakage and cracking when bent.

3. Annealing is a metal heat treatment process that involves slowly heating a metal to a certain temperature, holding it for sufficient time, and then cooling it at an appropriate rate. The purpose is to reduce hardness and improve machinability; Eliminate residual stress, stabilize size, reduce deformation and crack tendency; Refine grain size, adjust structure, and eliminate structural defects.