There are spiral steel annealing process in use, mainly in the following three ways

1, To stress annealing

Stress relief annealing, also known as low-temperature annealing (or tempering), which is mainly used to eliminate annealing casting, forging, welding, hot-rolled, cold-drawn pieces residual stress and the like. If not eliminate these stresses will cause the steel after a certain time, or deformation or cracks in the subsequent machining process.

2, The ball annealing

Ball annealing is mainly used HYPEREUTECTOID carbon steel and alloy tool steel (such as the manufacture of cutting tools, measuring tools, molds used steel). Its main purpose is to reduce the hardness to improve machinability, and hardened to prepare for the future.

3, Complete annealing and isothermal annealing

Also known as full annealing recrystallization annealing, generally referred to as annealing, the annealing is mainly used for sub-eutectoid composition of various carbon and alloy steel casting, forging and hot-rolled profiles, sometimes for welded structures. Usually often as some of the weight of the workpiece is not final heat treatment, or as a pre-heat treatment of some of the workpiece.