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A technology for cleaning steel and steel grades, applied in the field of metallurgy, can solve the problems of increasing equipment loss and hidden dangers, easy to be welded or blocked, unstable effect, etc., to achieve the effect of low cost, guaranteed production rhythm, and increased operation difficulty
Inactive Publication Date: 2017-10-24
ANGANG STEEL CO LTD
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The reason is the same as above, the powder spraying device directly contacts the molten steel and is easy to be welded or blocked, which increases equipment loss and safety hazards. At the same time, the depth of the shroud drilling into the tundish only by the impact of the molten steel will be affected by many factors. The effect unstable
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Embodiment 1
[0019] A method for RH to produce clean steel, the specific steps are as follows:
[0020] (1) 180t top-bottom combined blowing converter for slag-stop tapping, the tapping temperature is 1694°C, and 150kg of lime particles are added during the tapping process. The hanging tank temperature is 1644°C. After blowing argon for 5 minutes after the furnace, it was transported to the RH station. The RH entered the station to measure the temperature at 1621°C, and the oxygen was fixed at 564ppm. When entering the station, open the main vacuum valve to start forced decarburization. After 20 minutes, decarbonize to the target value, at this time, the fixed oxygen is 371ppm, and the temperature is 1603°C;
[0021] (2) Add aluminum at one time according to the oxygen activity. The target is to add according to the upper limit of the weight percentage of aluminum + 0.004%. 0.6kg / t of steel, 85kg of slaked lime added; after that, cycle for 5 minutes, temperature measurement and sampling...
Embodiment 2
[0027] A method for RH to produce clean steel, the specific steps are as follows:
[0028] (1) 180t top-bottom combined blowing converter for slag-stop tapping, the tapping temperature is 1698°C, and 170kg of lime particles are added during the tapping process. The hanging tank temperature is 1652°C. After blowing argon for 5 minutes after the furnace, it was transported to the RH station. The RH entered the station to measure the temperature at 1627°C, and the oxygen was fixed at 577ppm. When entering the station, open the main vacuum valve to start forced decarburization. After 20 minutes, decarbonize to the target value, at this time, the fixed oxygen is 361ppm, and the temperature is 1608°C;
[0029] (2) Add aluminum at one time according to the oxygen activity. The target is to add according to the upper limit of the weight percentage of aluminum + 0.005%. 0.6kg / t of steel, 92kg of slaked lime added; after that, circulate for 5 minutes, measure temperature and take sam...
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Abstract
The invention discloses a method for producing clean steel through RH. The method for producing clean steel through RH comprises the following steps that (1) tapping from a converter in a boiling or semi-boiling mode is conducted, and then steel enters an RH station; decarburization is conducted after temperature measurement and oxygen determination are conducted, after carbon is decarburized to a target value, the temperature measurement and oxygen determination are conducted; (2) aluminum is one-time added according to oxygen activity, the objective adding amount is 0.003%-0.007% more than the upper limit of the weight percentage of the aluminum; while adding the aluminum, slaked lime is added to a vacuum chamber through an overhead bunk, wherein the adding amount of the slaked lime is 0.4-0.6 kg per ton of steel, circulation is conducted for 3-5 min, and the temperature measurement and oxygen determination are conducted; and (3) when the oxygen activity is less than 0.0010%, the aluminum is not added any more, or the aluminum is replenished; the rest alloy materials are added and circulated for 3-5 min; then the temperature measurement and oxygen determination are conducted for ensuring that hydrogen content is less than 0.00015%, vacuum is eliminated, and then steel is moved out; still standing for 15-30 min and pouring on a machine are conducted. Total oxygen of the IF steel billet treated in this way decreases averagely 0.0005%-0.0008%, the size of the maximum inclusion is significantly reduced, and cleanliness is improved obviously.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for producing clean steel by RH. Background technique [0002] The key to improving steel quality and producing clean steel is to control inclusions. The harm of inclusions in molten steel to steel is mainly related to the quantity and size of inclusions, and the control of inclusions should run through the entire smelting process. Most of the inclusions in molten steel float up naturally through buoyancy. However, due to the production rhythm and the need for higher product quality in the smelting process, the inclusions only rely on the buoyancy of the natural state to float up, which cannot meet the high standard requirements of continuous production or customers. Therefore, removal of inclusions by other means is constantly being applied. [0003] The general means of removing inclusions include ladle blowing argon, prolonging refining time, prolonging standing...
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