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Node control method for treating low-carbon-aluminum molten killed steel through LF refining furnace

A low-carbon aluminum-killed steel and node control technology, which is applied in the field of iron and steel metallurgy and steelmaking, can solve the problems of long processing cycle time and high power consumption of LF refining furnace, and achieve the effect of improving production processing capacity

Inactive Publication Date: 2019-05-07
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process also has problems such as long processing cycle time of LF refining furnace and high power consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The converter is produced according to the normal process, with deoxidation and slag blocking at the end point. During the tapping process, the ladle is automatically bottom-blown with argon and stirred; enter the station with large argon (900-1100L / min) and stir for 1min, then measure the temperature and determine the oxygen. The condition of molten steel at the station, for example, if the oxygen concentration of molten steel is 5ppm, and the temperature at the station is 1570°C, add 150 meters of aluminum wire, 400kg of the first batch of lime, stir with argon gas for 2 minutes, manually sample 1 and measure the temperature for 2 minutes, and add aluminum to the ladle at the same time. 60kg of slag, slag making and temperature raising for 8 minutes, according to the composition of sample 1, feed aluminum wire 50 meters with aluminum, measure the temperature at 1598°C, stir with large argon gas (900-1100L / min) for 1 minute, and continue to power on for 2 minutes when th...

Embodiment 2

[0021] The converter is produced according to the normal process, with deoxidation and slag blocking at the end point. During the tapping process, the ladle is automatically bottom-blown with argon and stirred; enter the station with large argon (900-1100L / min) and stir for 0.5min, then measure temperature and fix oxygen for 0.5min , according to the conditions of molten steel entering the station, for example, if the molten steel is oxygenated at 5ppm and the temperature at the station is 1570°C, add 50 meters of aluminum wire, 200kg of lime in the first batch, stir with argon gas for 1 minute, then take a manual sample 1 and measure the temperature for 2 minutes. Add 50kg of aluminum slag, raise the temperature of slag making for 5 minutes, feed aluminum wire 50 meters to mix aluminum according to the composition of sample 1, measure the temperature at 1570°C and control it for 1 minute, and stir with large argon gas (900-1100L / min) for 1 minute. Continue to energize and rais...

Embodiment 3

[0023] The converter is produced according to the normal process, and the end point is deoxidized and slag is blocked. During the tapping process, the ladle is automatically bottom-blown with argon and stirred; enter the station with large argon (900-1100L / min) and stir for 1.5 minutes, then measure temperature and fix oxygen for 1.5 minutes , according to the conditions of molten steel entering the station, for example, the molten steel is oxygenated at 5ppm, and the entering temperature is 1570°C, then add 200 meters of aluminum wire, 500kg of lime in the first batch, and stir with argon gas (900-1100L / min) for 1min, then manually sample 1 and measure Warm for 3 minutes, add 100kg of aluminum slag to the ladle at the same time as the power is turned on, and raise the temperature for 10 minutes. According to the composition of sample 1, feed aluminum wire 50 meters and mix aluminum. Measure the temperature at 1570°C and control it for 1 minute. Continue to energize and raise t...

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PUM

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Abstract

The invention discloses a node control method for treating low-carbon-aluminum molten killed steel through an LF refining furnace. The node control method includes the following steps that pull-in large argon stirring is carried out for 0.5-1.5 min; temperature measuring and oxygen measuring are carried out for 0.5-1.5 min, aluminum wires and first-batch lime are added at 1-3 min, aluminum is controlled at 0.05-0.06%, and large argon stirring is carried out for 1-3 min; sampling and temperature measuring are carried out for 1-3 min; energization is carried out, aluminum slag is added, and slagging and temperature rising are carried out for 5-10 min; aluminum preparing and temperature measuring are carried out for 0.5-1.5 min; large argon stirring is carried out for 0.5-1.5 min; temperatureadjusting is carried out for 1-3 min; calcification treatment is carried out for 1-3 min; sampling is carried out; and soft blowing is carried out. By means of the method, the power consumption of the LF refining furnace can be reduced, and meanwhile the refining period is shortened so that the requirement of the high yield can be conveniently met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and steelmaking, and in particular relates to an LF refining process. Specifically, the invention relates to a node control method for processing molten steel of low-carbon aluminum-killed steel in an LF refining furnace. Background technique [0002] Low-carbon aluminum-killed steel (C: 0.03% to 0.06%, Al: 0.02% to 0.06%, Si: ≤0.03%) is a typical steel type of cold-rolled sheet, and this series of steel is mainly used for galvanized sheet or stamping forming, etc. . The process flow adopted by each steel mill is different, but the aluminum deoxidation process is basically adopted, and most steel plants adopt the process flow of converter-LF refining furnace-continuous casting machine, and the purpose of using LF refining furnace is to take advantage of its reducing The advantages of atmosphere, submerged arc heating, argon blowing and stirring etc. make reducing slag desulfuriz...

Claims

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Application Information

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IPC IPC(8): C21C7/00
Inventor 王强郭伟达李强笃王忠刚胡增跃高志滨薛志赵立峰
Owner SHANDONG IRON & STEEL CO LTD
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