The controlled atmosphere kiln is a manually prepared atmosphere, which can be subjected to heat treatment such as gas carburizing, carbonitriding, bright quenching, normalizing, annealing, etc. in order to change the metallographic structure and improve the mechanical properties of the workpiece. purpose. In the flow particle kiln, the combustion gas of the fuel, or other fluidizing agent applied externally, forcibly flows through the graphite particles or other inert particle layer on the kiln bed, and the workpiece is buried in the particle layer to achieve enhanced heating, or Various non-oxidation heating such as carburization and nitriding are performed. In the salt bath kiln, the molten salt solution is used as a heating medium to prevent oxidation and decarburization of the workpiece.
The melting of cast iron in the kiln furnace is often affected by conditions such as coke quality, air supply mode, kiln charge and air temperature, making the smelting process difficult to stabilize and difficult to obtain high quality molten iron. The hot air kiln can effectively increase the temperature of the molten iron, reduce the burning of the alloy, and reduce the oxidation rate of the molten iron, so that high-grade cast iron can be produced.
With the advent of coreless induction furnaces, the Chongtian Kiln has gradually been replaced. The smelting of this induction furnace is not limited by any cast iron grade. It can be converted from cast iron of one grade and quickly converted to cast iron of another grade, which is beneficial to improve the quality of molten iron. Some special alloy steels, such as ultra-low carbon stainless steels and steels for rolls and steam turbine rotors, need to be melted from a flat kiln or a general arc kiln by vacuum degassing and argon agitation in the refining kiln. Further refining high-quality molten steel of high purity and large capacity.
