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Method for producing high carbon steel by high-catching carbon method

A high-drawing carbon method and high-carbon steel technology, applied in the direction of improving process efficiency and manufacturing converters, can solve the oxygen pressure and oxygen supply intensity without clear blowing, reduce the amount of loading and tapping, and increase Fluorite has the effect of eroding the furnace lining and other problems, achieving the effect of slag removal and stability, reducing iron oxidation, and stable dephosphorization effect

Active Publication Date: 2008-12-31
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molten pool material level is 13-15% lower than the conventional one, which will reduce the amount of loading and tapping, and reduce production efficiency; the content of FeO in slag is low, <10%, which is not conducive to slag melting, and fluorite is used to force slag melting. This will increase the erosion of fluorite on the furnace lining, which is not conducive to the improvement of furnace life; the slagging method of lime and fluorite will cause large blowing losses of iron in the metal, and the metal yield will be low; there is no clear oxygen pressure for blowing in the literature and oxygen intensity
This process is also not suitable for modern converters to smelt high carbon steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the method for producing high carbon steel by the high-draw carbon method of the present invention, 180 tons of molten iron and 30 tons of scrap steel are added into a 210-ton converter, and the molten iron conditions are: 4.05% C, 0.39% Si, 0.2% Mn, 0.09% P , 0.032%S, 1347℃; the converter is in the middle and late stage, using 3.3Nm 3 The oxygen supply intensity of / min / t is blowing, the blowing gun position is 2.7 meters, the process gun position is 2.7-2.1 meters, and the carbon pulling gun position is 1.9 meters. After the blowing is started, 10 tons of lime are added to the converter in two batches within 4.5 minutes. (50 kg / ton of steel), 4 tons of ore (20 kg / ton of steel), 2 / 3 of the total amount added in the first batch, 1 / 3 of the total amount added in the second batch; 70-85% of the oxygen consumption in blowing Two batches of ore and fluorspar were added with a total of 600 kg and 400 kg; the total blowing time was 13 minutes, after the blowing w...

Embodiment 2

[0022] According to the method for producing high carbon steel by the high-draw carbon method of the present invention, 180 tons of molten iron and 30 tons of scrap steel are added into a 210-ton converter, and the molten iron conditions are: 4.19% C, 0.35% Si, 0.15% Mn, 0.079% P , 0.035%S, 1332℃; the converter is the middle and late furnace age, using 3.3Nm 3 The oxygen supply intensity of / min / t is blowing, the blowing gun position is 2.7 meters, the process gun position is 2.7-2.1 meters, and the carbon pulling gun position is 1.9 meters. After the blowing is started, 10 tons of lime are added to the converter in two batches within 4.5 minutes. (50 kg / ton of steel), 3 tons of ore (15 kg / ton of steel), 2 / 3 of the total amount added in the first batch, 1 / 3 of the total amount added in the second batch; 70-85% of the oxygen consumption in blowing Two batches of ore and fluorite were added, totaling 500 kg and 300 kg; the total blowing time was 13 minutes, when the blowing was ...

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Abstract

The invention provides a method for producing high-carbon steel by a high-carbon-withdrawal method, in particular to a smelting process of high-carbon-withdrawal tapping when a converter adopts a single slag process to produce high-carbon steel. The process comprises the following steps of: (1) putting molten iron and scrap steel into the converter according to the requirements on tapping temperature and a certain hot metal ratio; (2) air refining with the oxygen supply strength of 3.1 to 3.4Nm<3> / min / t in the converter; (3) adding active lime and an ore slagging element into the converter; (4) adopting an oxygen supply system of different lance positions under constant flow, adopting rather high lance positions in the whole course of air refining of the converter, and adopting a lance position system in which lance positions get lower piecewise from the beginning to the end of air refining; (5) adding ore and fluorite in small amount by a plurality of batches when the total air refining oxygen consumption is within 70 percent to 85 percent; (6) finishing the air refining of the converter, deslagging by turning down the converter, temperature measurement and sampling; and (7) converter tapping. The smelting process has advantages of short time of air refining of the converter and active slag, and can meet the dephosphorization effect under the high-carbon-withdrawal condition of molten steel, and realize the high-carbon-withdrawal tapping.

Description

technical field [0001] The invention relates to a smelting method for high-carbon steel, in particular to a smelting method for high-draw carbon tapping when a converter adopts a single-slag method to produce high-carbon steel. Background technique [0002] There are two ways for converter smelting high carbon steel according to the difference of carbon content of molten steel during tapping: one is high-draw carbon method, and the other is low-draw carbon method. Compared with the low-draw carbon method, the high-draw carbon method has the following advantages: shorter blowing time, less oxygen consumption, less blowing loss of iron, and higher metal yield; less erosion of the furnace lining by slag, and longer furnace life ; Small amount of carbon increase, small amount of carbon powder added; low oxygen content in steel, less alloy consumption, less original inclusions; low nitrogen, hydrogen and other gas content in steel; less fluctuation in steel composition and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/30C21C5/36
CPCY02P10/20
Inventor 田志红李永东张小明王海宝刘启江李鹏程王宴宾朱志远姜中行
Owner SHOUGANG CORPORATION
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