Grinding Balls Heat treatment is a kind of technological process that the billet is heated to a certain temperature in a specific environment for a certain period of time and then cooled at different speeds.
Grinding Balls heat treatment process heat treatment process generally includes heating, insulation, cooling three processes, sometimes only heating and cooling process. These processes are interconnected and can not be interrupted. Heating is one of the important processes of heat treatment. Grinding Balls heat treatment of many heating methods, the earliest use of charcoal and coal as a heat source, and then the application of liquid and gaseous fuels. Electric applications make heating easy to control, and without environmental pollution. These heat sources allow direct heating, as well as indirect heating of floating particles with molten salts or Grinding Balls.
When the Grinding Balls is heated, the workpiece is exposed to the air and oxidation and decarburization often occur (that is, the carbon content on the surface of the steel part is reduced), which adversely affects the surface properties of the part after the heat treatment. Thus Grinding Balls should usually be heated in a controlled atmosphere or in a protective atmosphere, in molten salt and in a vacuum, or by protective coating or packaging.
Heating temperature is one of the important process parameters of heat treatment process, select and control the heating temperature is to ensure the quality of heat treatment the main problem. The heating temperature varies with the Grinding Balls material being treated and the purpose of the heat treatment but is generally heated above the phase transition temperature to achieve high temperature microstructure. In addition, the transformation takes a certain amount of time. Therefore, when the Grinding Balls reaches the required heating temperature on the surface of the workpiece, it must be maintained at this temperature for a certain period of time so that the temperature of the interior and the exterior of the Grinding Balls match to complete the transition of the microstructure. This time is called the holding time. When using high-energy density heating and surface heat treatment, the heating rate is very fast, generally there is no holding time, while the holding time of chemical heat treatment tends to be longer.