Industrial furnace manufacturer
Furnace equipment principle
Industrial furnace is a kind of thermal equipment in industrial production, which uses the heat of fuel combustion or energy conversion to heat materials or workpieces. Generally speaking, boilers are also industrial furnaces, but it is customary not to include them in the scope of industrial furnaces.
Industrial furnace structure, heating process, temperature control and atmospheric environment directly affect the quality of finished products. In the forging furnace, increasing the heating temperature of metal can reduce the resistance of deformation, but excessive temperature will lead to grain growth, oxidation or overheating, seriously affecting the quality of the workpiece. During heat treatment, if the steel is heated to a temperature higher than the critical temperature and then suddenly cooled, the hardness and strength of the steel can be improved. If heated below the critical temperature, slow cooling can reduce the hardness and improve toughness of the steel.
Industrial furnaces can be used in many kinds of oxidation furnaces in order to obtain dimensional accuracy and surface finish, or to reduce metal oxides to protect the mold and reduce machining allowance. In the open flame of an unoxidized reheating furnace, reductive gases are produced by incomplete combustion of the fuel, in which heating the workpiece can reduce the oxidation loss rate to less than 0.3%. Artificial preparation was used to control the atmosphere of the furnace. Gas carburizing, carbonization, bright quenching, normalizing, annealing and other heat treatments were carried out by filling air. The microstructure changes were realized and the mechanical properties were improved.
In a fluidized bed furnace, the workpiece buried in the particle layer can be improved by burning fuel gas, other fluidizing agents, or external, through graphite particles or other inert particles. It can also be used for carburizing, nitriding and other non-oxidizing heating. In the salt bath furnace, molten salt solution is used as heating medium to prevent oxidation and decarbonization of the workpiece.
Iron smelting in industrial furnace is often affected by coke, gas supply quality, furnace condition and air temperature. It is difficult to stabilize the smelting process and obtain high quality molten iron. Hot blast stove can effectively increase the temperature of molten iron, reduce the loss of alloy, reduce the rate of iron oxidation, thus producing high cast iron. With the emergence of coreless induction furnace, there is a trend to replace cupola.
Cast iron workpiece
The smelting of industrial furnace is not restricted by any grade of cast iron. It can be converted from grade cast iron to another grade of cast iron, which is conducive to improving the quality of molten iron. For the use of special alloy steels such as ultra-low carbon stainless steel rolls and turbine rotor steels, you need an open-hearth or ordinary electric arc furnace to smelt steel, a refining furnace to further refine high purity, large capacity and high quality steels through vacuum degassing and argon stirring miscellaneous.