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Method for weak dephosphorization of peritectic steel in argon station

An argon station, peritectic technology, applied in the manufacture of converters, lime production, etc., can solve the problems of increasing the cost of ordinary molten steel treatment, and achieve the effect of increasing the amount of use

Inactive Publication Date: 2013-01-23
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

In this process, after the phosphorus content of the steel is controlled to be less than 0.012%, the dephosphorization in the ladle is carried out, which belongs to the dephosphorization process of producing ultra-low phosphorus molten steel, and does not belong to the category of molten steel used in the production of ordinary steel grades. Finally, a ladle slag removal device is added to increase The cost of common molten steel treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The target steel grade is Q235, and the amount of molten steel is 200 tons. The steps are as follows:

[0026] 1) Before tapping the converter, 100kg of medium-carbon ferromanganese is added to the ladle, and when the temperature of the molten steel reaches 1670°C and the carbon weight percentage at the end of blowing in the converter is 0.03%~0.05%, the tapping begins;

[0027] 2) After tapping, add 600kg of lime evenly into the ladle according to the tapping amount. After adding lime, add 300kg of refining agent evenly into the ladle according to the tapping amount. Refining agent, and at the same time adjust the argon flow rate at the bottom of the ladle to 150NL / min during the whole tapping process;

[0028] 3) Transport the tapped molten steel in step 2) to the argon station, blow argon for 5 minutes according to the argon flow rate of 100NL / min, take the aluminum content in the molten steel as the correction value of 0.020%, and float the fixed aluminum content va...

Embodiment 2

[0032] The target steel type is Q345, and the amount of molten steel is 200 tons. The steps are as follows:

[0033] 1) Before tapping the converter, 150kg of medium-carbon ferromanganese is added to the ladle. When the temperature of the molten steel reaches 1685°C and the carbon weight percentage at the end of blowing in the converter is 0.03%~0.05%, the tapping begins;

[0034] 2) After tapping, 800kg of lime is evenly added to the ladle according to the tapping amount. After adding lime, 600kg of refining agent is evenly added to the ladle according to the tapping amount. Refining agent, and at the same time adjust the flow rate of argon blowing at the bottom of the ladle to 100NL / min during the whole tapping process;

[0035] 3) Transport the tapped molten steel in step 2) to the argon station, blow argon for 10 minutes according to the argon flow rate of 50NL / min, take the aluminum content in the molten steel as the correction value of 0.020%, and float the fixed aluminu...

Embodiment 3

[0038] The target steel type is Q345 (BH), and the molten steel volume is 200 tons. The steps are as follows:

[0039] 1) Before tapping the converter, 80kg of medium-carbon ferromanganese is added to the ladle, and when the temperature of the molten steel reaches 1660°C and the carbon weight percentage at the end of blowing in the converter is 0.03%~0.05%, tapping begins;

[0040] 2) After tapping, add 400kg of lime evenly into the ladle according to the tapping amount. After adding lime, add 200kg of refining agent evenly into the ladle according to the tapping amount. Refining agent, and at the same time adjust the flow rate of argon blowing at the bottom of the ladle to 120NL / min during the whole tapping process;

[0041]3) Transport the tapped molten steel in step 2) to the argon station, blow the argon gas for 8 minutes according to the argon gas flow rate of 80NL / min, and take the aluminum content in the molten steel as the correction value of 0.020%, and float the fixe...

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Abstract

The invention discloses a method for the weak dephosphorization of peritectic steel in an argon station. In the method, a production route of converter tapping, argon station alloying and then continuous casting is selected, the phosphorus content of molten steel is reduced, and the quality of the molten steel is improved; and the molten steel is subjected to weak dephosphorization in an argon station. The molten steel subjected to weak dephosphorization is subjected to Als content and C content correction through an empirical correction valve method, and then, alloy fine adjustment components are added according to the correction values. According to the invention, by smelting peritectic steel with high-phosphorus molten iron, the success rate of composition controlling is kept above 90%; and when the peritectic steel is smelted with the high-phosphorus molten iron, the consumption of converter steel and iron materials is kept below 1102 kg per ton. The invention can increase the usage amount of the high-phosphorus molten iron and simultaneously avoid the increase of the consumption of converter active lime in the smelting process.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for weakly dephosphorizing peritectic steel in an argon station. Background technique [0002] Phosphorus plays a cold and brittle role in steel and is a harmful element in steel. Peritectic steel refers to a series of steel types with carbon content in the range where peritectic reaction is likely to occur in the Fe-C phase diagram. Common steel types such as Q235 are common steel types with large market demand. Phosphorus The control range is within 0.035%. In the fierce market environment, reducing the phosphorus content of molten steel and improving the quality of molten steel can enhance product competitiveness. With the increase of ore prices, in order to reduce costs, high-phosphorus iron ore began to be used. However, the high phosphorus in hot metal caused the phosphorus in the steel to increase to the range of 0.015~0.030%. In the subsequent links, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/064C21C7/068C21C5/28
CPCY02P40/40
Inventor 陈俊孚曹同友万恩同李海洋高文芳彭著刚孙伟齐江华杨治争
Owner 武汉钢铁有限公司
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