A Stable Control Method of Temperature in Aod Furnace Smelting Process
A stable control method and smelting process technology, applied in the field of AOD furnace smelting, can solve the problems of increased consumption of lime fluorite, increased oxidation of Cr, oxidation of chromium elements, etc., and achieves the effect of reducing material consumption, reducing oxidation, and stably controlling
Active Publication Date: 2016-01-20
XINGTAI IRON & STEEL
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Problems solved by technology
When the effective temperature of the initial mother liquor is negative and cannot meet the high temperature requirements of decarburization and chromium preservation, a large amount of chromium will be oxidized, and if the temperature fluctuates greatly, it will also cause the oxidation of Cr to increase, and then lead to lime, ferrosilicon, and fluorescein. The increase in stone consumption leads to a vicious circle of reduced furnace life
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Embodiment
[0083] Embodiment: (1) this method is tested by a certain workshop of Xing Steel, and through statistics, the original one-step method is adopted to produce 0Cr13C steel grade technology, see Table 1 with the consumptions such as lime, ferrosilicon, fluorite that adopt this method technology.
[0084] Table 1: Composition and related conditions of initial materials
[0085]
[0086] (2) Calculate the effective temperature according to the above conditions:
[0087] T 1 =-85°C, which is a negative number, the position of the top gun should be controlled between 2.9 and 3.3 meters, and 3.15 meters should be selected. At the same time, since the initial C of the mother liquor is 3.5% (> 3%), K 2 Take 15%, follow T 2 Formula to calculate T 2 =159℃, the temperature margin is T 1 +T 2 =-85+159=74°C.
[0088] (3) Addition amount of steel scrap returned during the top gun period:
[0089] The above-mentioned temperature margin is 94°C and its value is > 40, so the addition a...
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The invention discloses a method for stably controlling the temperature in a smelting process of an AOD (argon oxygen decarburization) furnace. The method is characterized in that when the AOD furnace is used for producing stainless steel, a mother liquid is added into the AOD furnace firstly, alloys and slag materials are added, and the effective temperature of the mother liquid is calculated according to a formula; when the effective temperature of the mother liquid is a positive value, solid return scraps are added for cooling; and when the effective temperature of the mother liquid is a negative value, the position of an oxygen lance is adjusted to increase secondary burning capacity of CO gas. According to the method, the return material is flexibly applied while the oxidation quantity of chromium in the overall smelting process is reduced, and the purposes of shortening of smelting period, reduction of AOD furnace material consumption, prolonging of furnace age and fund release are achieved; the temperature in the smelting process of the AOD furnace can be controlled stably, chromium oxidation is reduced to the greatest extent, and consumption for reduction of silicon iron, lime and the like is reduced; and further, a large quantity of solid return scraps can be consumed while requirements of rapid decarburization and no additional increase of energy consumption between processes are met, and the production cost is effectively reduced.
Description
technical field [0001] The invention relates to a method for smelting an AOD furnace, in particular to a method for stably controlling the temperature during the smelting process of the AOD furnace. Background technique [0002] AOD furnace is the abbreviation of argon oxygen decarburization furnace (Argon Oxygen DeCarburization). In the current stainless steel production process, the AOD furnace plays an important role. According to statistics, more than 70% of the stainless steel products in the world are smelted through the AOD furnace. Relying on the good kinetic conditions of side blowing, it realizes decarburization and chromium preservation by increasing the process temperature and reducing the partial pressure of CO gas. It has the advantages of simple equipment structure, convenient operation, cheap high-carbon ferrochrome and return stainless steel Easy to produce low-carbon and ultra-low-carbon stainless steel and many other advantages. [0003] However, for the...
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IPC IPC(8): C21C7/068
Inventor 冯文甫曹洪波郭键雷学东王秋坤张永昶张秀堂
Owner XINGTAI IRON & STEEL