The spheroidizing annealing is only applied to steel an annealing method. The GL E32 heated to a temperature slightly lower than or slightly higher than that of Ac1 in A1 temperature or temperature fluctuation cycles, then slow cooling down.
Purpose is to make pearl in the lamellar cementite and pelletized first eutectoid cementite, and evenly distributed in the ferritic matrix (this organization called ball perlite).
With this group of medium carbon steel and high carbon steel and low hardness, by cutting, cold deformation ability. Before quenching for tool steel, this organization is one of the best original organization.
To heat stress relieving is to GL E32 to Ac1 under proper temperature (non alloy steel in 500 ~ 600 ℃), heat preservation with furnace cooling after heat treatment process is called the stress relieving.
To stress the heating temperature is low, no organization transformation in the process of annealing, and is mainly used in the blank after machining parts, the purpose is to eliminate the residual stress of blank and parts, stable size and shape of workpiece, reduce the parts in the process of machining and the use of deformation and crack tendency.
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