Method for producing high carbon steel through double-slag high drawing carbon tapping
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A high-carbon steel and high-drawing carbon technology, which is applied in the field of high-carbon steel production by double-slag method high-drawing carbon tapping, can solve the problems of low production efficiency and serious phosphorus return, so as to increase the furnace life and reduce the amount of phosphorus return , Improve the effect of dephosphorization rate
Active Publication Date: 2012-07-11
SHOUGANG CORPORATION
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[0006] The purpose of the present invention is to provide a method for producing high-carbon steel by double-slag high-drawing carbon tapping, which overcomes the shortcomings of the above-mentioned tapping process, such as relatively serious phosphorus return and low production efficiency.
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Embodiment 1
[0029] According to the method for producing high-carbon steel by double slag method high-drawing carbon tapping of the present invention, 185 tons of molten iron and 23.5 tons of scrap steel are added to a 210-ton converter, and the conditions of the molten iron are: 4.13%C, 0.37%Si, 0.23%Mn , 0.10%P, 0.038%S, 1357℃; the first stage uses 2.8Nm 3 / min / t oxygen supply intensity blowing, the position of the blowing gun is 2.5 meters, the position of the process gun is 2.7-2.1 meters, and the position of the carbon pulling gun is 1.9 meters. After the blowing is started, 5 tons of lime (25 kg / tons of steel), 1.5 tons of ore (7 kg / ton of steel), the bottom blowing nitrogen flow rate is 0.1Nm 3 / min / t, the composition and temperature of molten iron at the end of the first stage are: 3.53%C, 0.002%Si, 0.09%Mn, 0.021%P, 0.041%S, 1387℃; the second stage uses 3.3Nm 3 / min / t oxygen supply intensity blowing, the blowing gun position is 2.3 meters, the process gun position is 2.6-2.1 me...
Embodiment 2
[0031] According to the method for producing high-carbon steel by double-slag method high-drawing carbon tapping of the present invention, add 183 tons of molten iron and 25 tons of scrap steel into a 210-ton converter, and the conditions of the molten iron are: 4.03%C, 0.58%Si, 0.21%Mn , 0.097%P, 0.034%S, 1377℃; the first stage uses 2.8Nm 3 / min / t of oxygen supply intensity blowing, the position of the blowing gun is 2.4 meters, the position of the process gun is 2.6-2.1 meters, the position of the carbon pulling gun is 1.8 meters, and 4.5 tons of lime (23 kg / tons of steel), 1.5 tons of ore (7 kg / ton of steel), the bottom blowing nitrogen flow rate is 0.1Nm 3 / min / t, the composition and temperature of molten iron at the end of the first stage are: 3.68%C, 0.002%Si, 0.08%Mn, 0.023%P, 0.035%S, 1369℃; the second stage uses 3.3Nm 3 / min / t oxygen supply intensity blowing, the blowing gun position is 2.3 meters, the process gun position is 2.7-2.0 meters, the blowing gun position...
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Abstract
A method for producing high carbon steel through double-slag high drawing carbon tapping belongs to the technical field of smelting high carbon steel through a converter. The method comprises processing steps as follows: molten iron and steel scraps are loaded in the converter according to a certain molten iron ratio; in a first stage of converter steelmaking, the converting is performed at the oxygen supplying intensity of 2.8 Nm<3>/min/t, active lime and ore fluxing mediums are added in the converter, and a larger bottom blown flow rate is adopted to stir; the converting is performed at a standard lance height in the prior period for the converting of the converter, and then the lance height rises gradually; part of furnace slag is dumped through a rocking furnace; in the second stage for the converting of the converter, the converting is performed at the oxygen supplying intensity of 3.3 Nm<3>/min/t, and active lime and the ore fluxing mediums are added in the converter; the lance height rule that the converting is performed at a higher lance height in the later period and the lance height descends stage by stage is adopted; a small quantity of ores and fluorites are added frequently within 80 to 90 percent of total converting oxygen consumption; after the converting of the converter is finished, deslagging is performed through the rocking furnace of the converter, and temperature measurement and sampling are carried out; and converter tapping is carried out. The method has the advantage of overcoming the shortages of serious rephosphoration caused during the tapping process, low production efficiency, and so on.
Description
technical field [0001] The invention belongs to the technical field of converter smelting high-carbon steel, in particular to a method for producing high-carbon steel by double-slag high-drawing carbon tapping. Background technique [0002] There are two ways to smelt high-carbon steel in converters according to the carbon content of molten steel when tapping: one is the high-drawing carbon method, and the other is the low-drawing carbon method. The high-drawing carbon method has short tapping and blowing time, less oxygen consumption, less iron blowing loss, and high metal yield; the carbon content of tapping is high, and the total iron content of slag is low, which can reduce the erosion of slag on the furnace lining and increase the furnace life; When tapping, the carbon content is high, and the oxygen activity of molten steel is low, which can increase the alloy yield; high-drawing carbon tapping can reduce the amount of carburizing agent, which not only saves the cost, ...
Claims
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Application Information
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