Annealing process overview
Annealing refers to the heating of steel to an appropriate temperature,Keep a certain time,Then slow cooling heat treatment。The purpose of annealing is:Reduce hardness,Take advantageous;Improve plasticity and toughness,Plus for cold deformation processing;Improve the performance of steel or prepare for future heat treatment;Eliminate residual internal stress in steel,Prevent deformation and cracking。
Three type annealing process
Common three types of annealing processes are completely annealed、Glornification annealing and depletion to annealing。
Complete annealing is heating steel to completely bust,Slow cool,Way to get proximity to balanced status。Purpose:Balance organization,Reduce hardness、Refine grain、Fully eliminate internal stress。
Spherical annealing is to heat steel to a critical point temperature,Insulation for a certain time,Not more than50℃/hThe cooling speed is cooled down with the furnace.,Process method of carbide in steel。Purpose:Reduce hardness,Improve cutting processability,And prepare for quenching。
Debutance annealing is to heat the steel to a slightly lower critical point temperature,Process method for slow cooling after a certain time。Purpose:Eliminate residual stress。

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