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Normalizing ( Air quenching) is a heat treatment process in which steel is heated 40°-50° C above re-crystallization temperature , hold for some time and then air cooled to the room temperature. It is one of the heat treatment process which is used for ferrous materials only.  Fig. - air cooled steel components This treatment refine the grain structure and increase uniformity of micro-structure and propertied of hot rolled steel.   Normalizing process  use to remove internal stress. It gives rise to the bainite, martensite and perlite. Normalizing require less cost than annealing due to air cooling. Due to normalizing, hardness of steel increase and ductility decrease.

know the Heat Treatment...! Heat treatment is defined as the operations involving the heating and cooling of a metal or an alloy within a solid-state to obtain desire properties (physical or chemical) without change composition. The heat treatment process is carried out to change the grain size, modified the crystal structure of the material, and relieve the stress set up in the material after hot or cold working. Heat treatment also uses in many manufacturing processes, eg. glass working. The heat treatment process is performed in the furnace or oven with a controlling the environment of step-by-step heating and cooling within a specific period of time, apart from this the gases are used to control the furnace environment in some processes.  Fig.1 - Heat treatment process of gears Heat treatment consists of heating of metal near of above re-crystallization temperature of the material, hold for a particular time, and then finally cooling the metal in some medium which may be air, ...