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AOD(Argon Oxygen Decarburization) Furnace

(1) Stainless steel making and other high grade alloys production;
(2) Decarburization, reduction, and desulfurization;
(3) High chrome recovery up to 97%;
(4) Saml investment and area occupation;

AOD(Argon Oxygen Decarburization) Furnace introduction

     AOD, it is common use facility for stainless steel with ultra low sufur(S≤0.001%) and carbon(C≤0.04%), it is also a secondary Steel making process mainly used for refining Stainless Steel. In this lancing is done at supersonic speed with mixture of oxygen and inert gas (Argon, Nitrogen). Here also carbon combines with oxygen and forms CO and travels to slag metal interface. As the carbon content reduces to desired level oxygen blowing is reduced and Argon blowing is increased and at the end Argon is blown for complete homogenisation of bath and effective slag- metal reaction, which shape is similar to a converter, and the furnace body is placed on a support ring that can be tilted back and forth and fixed by pins. The bottom side of the furnace is equipped with a lance for blowing gas into the horizontal direction of the molten pool. The number of lances varies according to the tonnage of the furnace, generally 2~3. The meeting point of the lance extension lines coincides with the vertical axis of the furnace. The spray gun consists of two layers, an inner tube (copper) and an outer tube (stainless steel). The inner tube introduces the main blowing gas (composed of ArO2. or Ar-N2), and the annular gap between the inner tube and the outer tube introduces Ar and N2. or air for cooling to protect the lance. The lance is consumable, buried in the refractory layer when the furnace is built, and burnt out synchronously with the furnace lining during the smelting process. 


     The oxygen blown in is mainly used to heat up the carbon oxide, the argon gas blown in is mainly for strong convection stirring, and nitrogen blowing can be used for alloying when producing high-nitrogen alloys. -4N steel grades save a lot of metal nitrides, such as the addition of nitride complexes, and save a lot of production costs.


    The furnace body is built with magnesia-calcium bricks or chrome-magnesium bricks or magnesia-rich dolomite bricks; the spray gun is built with higher quality fused chrome-magnesium bricks to withstand high temperature and molten steel scouring. The removable furnace cap is built with chrome-magnesium bricks or aluminum-magnesium bricks, and can also be poured with heat-resistant concrete. The size ratio of the furnace is roughly: the depth of the molten pool: the diameter of the furnace: the total height of the furnace is 1:2:3. When the furnace is tilted forward at a certain angle, the initial molten steel is poured from the transfer ladle, and the gas spray gun is above the molten steel surface. When the furnace returns to the upright position, the spray gun is submerged into the depth of the molten steel, and air-blown refining begins. After the refining is completed, the steel is still tapped through the furnace cap.






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