Heat treatment for ZFV valve raw material involves the use of extreme high temperature, to achieve a purpose that harden or soften material. Heat treatment techniques include annealing, normalizing, tempering, quenching, solution treatment, case harden and precipitation strengther. Here we explain normalizing.
Procedule of normalizing: heat the metal material to specific high temperature which be mentioned on material stardard, hold the temperature for certain time, next cooling the metal at a rate a little slower than annealing. the metal is generally in air.
Similar with annealing, the purpose of normalizing include :
soften raw material, for cooling machine work earlier.
remove material innerstress, caused by cold machine or hot machine.
recrystallize refined microstructure, improve the mechanic properties, prepare for further production.
Normalizing is used to be a pre-heat treatment of forging part, welding part and so on; normalizing is also can be final heat treatment of mild-carbon steel and medium-carbon steel which is not used in strict condition . Normalizing is not generally used for final heat treatment of high alloy steel .
Zhejiang Zhengfeng Valve