Selection and control of heating temperature, is important to guarantee the quality of heat treatment. Another change will take some time, so when the metal surface to meet the requirements of the heating temperature, still need to keep the temperaturein the certain time, inside and outside temperature, so that the microstructure
Changed completely, this time called the holding time. High energy density, heatingand surface heat treatment, heating speed is very fast, generally there is no holding time, the chemical treatment of the holding time is usually long. But also becausedifferent kinds of steel have different requirements, such as empty hard steel
You can use the same normalizing the cooling speed of quench hardening.
Cooling heat treatment process is an indispensable step in precision forging industry,cooling method for forging process and heat treatment process is different, the mainis to control the cooling speed, cooling speed in general annealing is the slowest,cooling speed is faster than goods,
Quenching cooling faster. Objective with the heating temperature of metal materials and heat treatment processes is different and different, but generally are heated to atemperature above, to obtain high temperature. The heating temperature is one of the important parameters of the heat treatment process, is also the precision forgingprocess
One of the important process parameters.