1. Complete annealing and isothermal annealing
The fully annealed also known as recrystallization annealing, generally referred to as annealing, this annealing is mainly used for sub-eutectoid composition of carbon steel and alloy steel casting, forging and hot rolled profiles, sometimes for welded structure. Commonly as unimportant final heat treatment of the workpiece, or as some pre-heat treatment of the workpiece.

2. Ball annealing
Ball annealing is mainly used for eutectoid carbon steel and alloy tool steel (such as the manufacture of cutting tools, mold steels). Its main purpose is to reduce the hardness, to improve the machinability, and to prepare for the subsequent quenching.

3. To stress annealing
To stress annealing, also known as low-temperature annealing (tempering), this annealing is used to eliminate the castings, forgings, welding, hot-rolled, cold-drawn pieces of residual stress. If these stresses are not removed, will cause the steel after a certain time, or in a subsequent machining process is deformed or cracks.



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