AOD Argon oxygen decarburization is a process primarily used in stainless steel making and other high-grade alloys with oxidizable elements such as chromium and aluminium. After initial melting the metal is then transferred to an AOD furnace vessel where it will be subjected to three steps of refining; decarburization, reduction, and desulfurization will be done.
The AOD furnace (Argon oxygen decarburization furnace) has a shape similar to that of a converter, and the furnace body is placed on a support ring that can be tilted back and forth, fixed by pins.
AOD furnace method (i.e. argon oxygen decarburization method) is a more advanced technology for refining stainless steel. The Argon Oxygen Decarburization has the advantages of simple equipment, convenient AOD furnace operation, strong adaptability, low investment, and low production cost, and is widely adopted.
AOD furnaces are more advanced than traditional steelmaking processes, with advantages such as high production efficiency, stable product composition, and low energy consumption. In recent years, with the increasing demand for stainless steel, AOD argon oxygen decarburization furnaces have been widely used in various scale steel enterprises, becoming one of the main engines of industrial development.
Decarburization and chromium retention
Degassing
Remove inclusions
Desulfurization
Removal of harmful trace elements
Convenient process control
Good economic effect
In combination with the AOD furnace process of directly mixing molten iron into AOD Argon Oxygen Decarburization in blast furnace, the furnace body from us, one of the leading steel furnace manufacturers in China, adopts "YC" type structure, reasonable AOD furnace melting ratio, top side combined blowing, which can effectively improve the oxygen utilization coefficient of AOD furnace, reduce chromium loss, and improve smelting furnace life. Relevant design requirements fully consider the Thermal equilibrium in the whole smelting process, oxygen utilization rate and refractory consumption in the argon oxygen decarburization smelting process, so as to improve the technical and economic indicators of AOD furnace. According to actual smelting data, the smelting time of pure iron has been shortened to 75 minutes, and the AOD furnace life has reached 125 heats, reaching the highest level in China
As one of types of steel making furnaces, the AOD furnace adopts a fully suspended structure to prevent thermal stress failures. Eliminate the thermal stress between the AOD furnace body and the support ring during the smelting process.
AOD furnace bracket with gas backpack on the back, minimizing the length of the hose; Adopting a rotary joint to supply air to the AOD furnace reduces accidents caused by hose damage; And considering the damage to the gas backpack caused by the slag line passing through the AOD furnace during the smelting cycle, corresponding protective design has been made for the gas backpack.
To ensure operational safety, the main gun gas automatically opens and closes at a certain angle.
Automatic switching of two incoming power sources.
Monitor and control the inclination angle of AOD furnace at any time.
Considering the smelting safety of AOD argon oxygen decarburization, the valve frame section should be added with the following protections:
The valve rack auxiliary gun is controlled separately so that the air gun can be adjusted separately to protect the air gun and improve the furnace life of the argon oxygen decarburization.
Add limit switches to each pneumatic O-shaped ball valve on the valve rack, and interlock between the valves to ensure safe operation and losses caused by misoperation of argon oxygen decarburization process.
Add random gas to the top gun to improve the utilization rate of oxygen, achieve maximum utilization rate of the top gun, and change the previous "soft blowing" of the AOD top gun to achieve the "hard blowing" function of the AOD top gun, greatly shortening the AOD furnace full form smelting time.
AOD furnace refractory materials adopts an inner lining that directly combines MgO with Cr2O3, or an inner lining produced by combining or semi combining MgO with Cr2O3. Magnesium chromium bricks are directly bonded by calcining high-quality high-purity magnesium sand and refined chromium ore at high temperatures.
AOD furnace refractory also uses electric melting unburned magnesium dolomite bricks and fired magnesium dolomite bricks as AOD furnace lining materials. Because the fused magnesium dolomite sand has been fully melted, it is very stable and the lattice is also very complete, making it have strong resistance to hydration and erosion.
Argon Oxygen Decarburization process: The molten iron from the blast furnace, the alloy melted from the intermediate frequency furnace and electric arc furnace are injected into the AOD argon oxygen decarburization furnace through the ladle. During smelting, a mixture of O2, Ar, or N2 gas is blown in to decarbonize the molten steel. At the same time, reducing agents, desulfurizers, ferroalloys, or coolants are added to the feeding system to adjust the composition and temperature of the molten steel. The carbon and other impurities in the molten steel are removed, and oxygen is used for high-temperature oxidation. Then, inert gases (such as argon) are used to neutralize the oxidation effect, Forming high-quality steel products.
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