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A technology of molten steel smelting and molten steel, which is applied in the field of low-phosphorus steel production, can solve the problems of reducing the age of the converter, occupying a long time of the converter, damage to the lining of the converter, etc., and achieve the effects of shortening the smelting period of the converter, less erosion and less slag
Inactive Publication Date: 2009-05-06
ANGANG STEEL CO LTD
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[0005] Both the single-furnace double-slag method and the double-link method complete the dephosphorization treatment in the converter, and a large amount of slagging is required twice in the converter, and both need to be quickly slagged in the converter. Therefore, low melting point substances are often introduced as fa
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[0018] Example 1:
[0019] Take the 500kg electric induction furnace deep dephosphorization as an example.
[0020] Melt 500kg of molten steel with medium frequency induction electric furnace, ω[P]=0.0070%, molten steel temperature 1678℃, use metallurgical white ash, iron oxide red, bauxite as slag-making agent, and at the same time as deep dephosphorization agent, the total amount of slag added is 2.5 kg, its composition is 35% CaO, 30% FeO, 13% Fe 2 O 3 , 18% Al 2 O 3 , 2% SiO2, 1% MnO, 1% MgO. Use induction current to stir, after processing for 5 minutes, tilt the crucible, pull out the steel slag from the crucible, after pulling out more than 95%, add 1kg of metallurgical white ash to make new slag, cover the molten steel, the molten steel ω[P] is reduced from 0.0070% to 0.0015 %.
Example Embodiment
[0021] Example 2:
[0022] Take the application of a 180-ton converter as an example.
[0023] Into the converter molten iron ω[P]=0.04%. In converter smelting, metallurgical white ash, iron ball and light burned dolomite are used as slagging agents. The slagging capacity is 8.9 tons, the smelting time is 30 minutes, and the steel output is 190 tons. Converter tapping water ω[P] = 0.008%, 0.8 tons of deep dephosphorizing agent is added to the ladle, 1.6 tons of deep dephosphorizing agent is added after tapping, the dephosphorizing agent composition is: 33% CaO, 29% FeO, 13 %Fe 2 O 3 , 18% Al 2 O 3 , 3% SiO2, 2% MnO, 2% MgO. The temperature of molten steel is 1675℃, argon gas is blown and stirred at the bottom, and the gas supply intensity is 20Nm 3 / min, stirring time 5min. Then carry out slagging treatment, remove more than 95% of steel slag in the ladle, and re-slag, that is, complete dephosphorization treatment, molten steel ω[P] = 0.004%. Compared with dephosphorization proces...
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Abstract
The invention provides a smelting method for efficiently producing low-phosphorous liquid steel through one-time slagging in a converter. The method comprises converter smelting and ladle refining. The method is characterized in that the temperature of converter smelting liquid steel is higher than or equal to 1,680 DEG C; the phosphorous content of the liquid steel is less than 0.012 percent; activity oxygen in the liquid steel is controlled to account for 0.1 to 0.13 percent; before converter tapping, deep dephosphorization agents are put into a ladle; in a converter tapping process, slag stopping control is performed so as to ensure that the amount of outflow slag is less than or equal to 3 kilograms per ton of steel, and the liquid steel in the ladle is subjected to weak deoxidation treatment; after the tapping is over, the deep dephosphorization agents are put into the ladle again; then ladle bottom blowing and argon stirring are carried out; and finally, steel slag in the ladle is eliminated by use of a ladle slagging-off device. Compared with other methods, the low-phosphorous liquid steel smelting method reduces slag amount by more than 20 percent and shortens converter smelting period by more than 5 percent. As slagging is carried out only once in a converter, the method is little in the erosion of a converter lining, and rephosphorization phenomena can not occur in a secondary refining process of the liquid steel.
Description
technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a production method of low-phosphorus steel. Background technique [0002] Phosphorus is a common harmful element in steel, which is easy to segregate at grain boundaries, causing low temperature brittleness and temper brittleness of steel. High-grade high-quality steel has increasingly stringent requirements for phosphorus content in steel, especially for low-temperature steel, marine steel, and hydrogen-induced cracking-resistant steel. Therefore, the problem of dephosphorization in steelmaking production has always been highly concerned by the metallurgical industry. In recent years, the smelting of pure steel has been highly valued by countries all over the world. As an important part of pure steel smelting, the production of low phosphorus steel (ω[P]<0.01%) and ultra-low phosphorus steel (ω[P]<0.003%) Production is a content that cannot be...
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