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Method for controlling silicon content in low-silicon aluminum steel refining process

A low-silicon-aluminum and silicon-content technology, which is applied in the field of silicon content control in the low-silicon-aluminum steel refining process, can solve problems such as silicon increase, and achieve the effect of reducing the probability of stoppage

Active Publication Date: 2015-04-01
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The silicon content in low-silicon-aluminum steel is generally less than 0.08%, and some steel grades are even lower. In the refining process, even if the addition of silicon-containing alloys is strictly controlled, there will still be silicon increase

Method used

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Examples

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Effect test

specific Embodiment approach

[0021] Taking the refining steel wool line in the ladle refining furnace of No. 1 steelmaking branch factory of Wuhan Iron and Steel Co., Ltd. as an example, the specific implementation of the method for controlling the silicon content in the refining process of low-silicon aluminum steel is described, which includes the following steps:

[0022] 1) The molten steel in the ladle is initially slagged through the argon station, and then the ladle is hoisted into the ladle refining furnace.

[0023] 2) Measure the molten steel temperature as 1585°C, and determine the heating time as 15 minutes according to the measured actual molten steel temperature, the heating target value as 1630°C and the heating rate of 3°C / min, to ensure that the heating is in place at one time, and to the weight during the heating process. Add 175kg of lime and 85kg of refining slag to 115 tons of molten steel. At the same time, according to the color of the slag sample and the composition of the molten st...

Embodiment 2

[0027] This example is basically the same as Example 1, except that: 2) The measured molten steel temperature is 1558°C, and the heating time is determined to be 18 minutes according to the measured actual molten steel temperature, the heating target value, and the heating rate of 4°C / min, and Add 200kg of lime and 100kg of refining slag during the heating process.

[0028] 3) Soft blow for 4 minutes after heating, add 220kg of lime and 300kg of refining slag, and then ensure that the acid-soluble aluminum content does not exceed 330ppm after adding aluminum pellets.

[0029] 4) After 4 minutes of soft blowing, feed 700m of calcium iron wire, and ensure that the basicity of the final slag is controlled at 5.0, and the sum of FeO and MnO content is controlled at 1.3% of the total weight of slag.

Embodiment 3

[0031] This example is basically the same as Example 1, except that: 2) The measured molten steel temperature is 1535°C, and the heating time is determined to be 19 minutes according to the measured actual molten steel temperature, the heating target value, and the heating rate of 5°C / min, and Add 225kg of lime and 117kg of refining slag during the heating process.

[0032] 3) Soft blow for 5 minutes after heating, add 300kg of lime and 400kg of refining slag, and then ensure that the acid-soluble aluminum content does not exceed 400ppm after adding aluminum pellets.

[0033] 4) After 5 minutes of soft blowing, feed 800m of calcium iron wire, and ensure that the basicity of the final slag is controlled at 5.2, and the sum of FeO and MnO content is controlled at 1.5% of the total weight of slag.

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Abstract

The invention discloses a method for controlling a silicon content in a low-silicon aluminum steel refining process. The method comprises the following steps of 1) hoisting a steel ladle to a steel ladle refining furnace; 2) adding lime and refining slag while heating, wherein the weight ratio of the liquid steel to the lime to the refining slag is 1150: (1.75-2.25): (0.85-1.17); and adding aluminum shots according to the upper limit of acid-soluble aluminum; 3) taking a slag sample after soft blowing, supplementing the lime and the refining slag, wherein the weight ratio of the liquid steel to the lime to the refining slag is 1150: (1-3): (2-4); next, adjusting the slag to light green, and adding the aluminum shots according to the medium upper limit of acid-soluble aluminum; 4) feeding a calcium-iron line by 500-800 m after soft blowing and then conveying the same to a continuous casting machine, and guaranteeing the final slag alkalinity within the range from 4.8 to 5.2 and the sum of the content of FeO and the content of MnO to be 1.0-1.5% of the total weight of the slag. The method provided by the invention is capable of meeting the requirements of liquid steel deoxidization and slag formation, and also capable of controlling the silicon content of the liquid steel in a rational range; and therefore, the method is widely applicable to the technical field of ferrous metallurgical secondary refining.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy out-of-furnace refining, in particular to a method for controlling silicon content in a low-silicon aluminum steel refining process. Background technique [0002] The silicon content in low-silicon-aluminum steel is generally less than 0.08%, and some steel grades are even lower. In the refining process, even if the addition of alloys containing silicon is strictly controlled, there will still be silicon increase. Especially in the pouring furnace, due to the reasons such as ensuring that the inclusions are fully floating and matching the rhythm of the casting machine, the refining time is long, resulting in obvious silicon increase phenomenon, and various components cannot be poured, making the production easy to come to a standstill. Therefore, low-silicon aluminum is controlled. The silicon increase phenomenon of steel in the refining process of ladle refining furnace is a ver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/06
Inventor 段光豪王光进耿恒亮张鹏飞朱志鹏田勇王彦林
Owner 武汉钢铁有限公司
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