base trays, grids, charging baskets for heat treatment furnaces
Heat treatment process
Heat treatment process generally includes three steps: heating, heat preservation and cooling, sometimes, there are only two steps: heating and cooling. The steps connect to each other and can’t be interrupted.
Heating is one of step of heat treatment process.There are many heating methods for metal heat treatment. The first is using charcoal and coal as the heat source, and then using liquid and gas fuel.Heating using electricity is easy to control, and there is no environmental pollution. The heat source can be used to direct heating, and also can be used to indirect heating by floating particles producing in the process of molten salt or metal.
In the heating process, metal is exposed to the air and often occurs oxidation and decarburization (that is, the carbon content of steel parts surface lower) , which has a bad effect to surface properties of the metal parts after heating treatment.Thus metals usually should be heated in a controlled or protective, molten salt and vacuum atmosphere, and protective heating by coating or packing method is also available.
to be continued.