Due to the different aims, the types of heat treatment is very much, basically can be mainly divided into two categories, the first kind is the organization structure by heat treatment and not change or should not change, the second is the basic structure has the change.
The first kind of heat treatment procedure, mainly for the elimination of stress, and the internal stress in the process of casting cooling conditions and different conditions and cause. Organization, strength and other mechanical properties, not because of heat treatment and change greatly.
For the second type heat treatment is concerned, al-qaida there has been a marked change, can be divided into five categories:
(1) softening annealing: the goal is to disassemble carbide, its hardness is reduced, and the improvement of the machining performance, to atone for cast iron ball, the goal is to get a high fertility has the iron organization.
(2) the normalization of processing: mainly used to improve or completely is a wave to iron casting for the organization of the product of uniform distribution mechanical properties.
(3) quenching: mainly in order to get higher hardness or abrasion strength, at the same time to the surface of the high wear resistance properties.
(4) surface hardening process: mainly to gain the surface hardening layer, and get the surface of the high wear resistance properties.
(5) exhalation hardening process: mainly to take high strength and elongation does not happen so drastic changes.




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