Ultra-low-carbon aluminum-killed steel vacuum carbon-loaded preliminary deoxidation process

A technology of aluminum killed steel and pre-deoxidation, which is applied in the field of metallurgy, can solve the problems of high consumption of aluminum shot and high content of inclusions, and achieve the effect of improving the purity of molten steel, reducing the content of inclusions, and reducing costs

Active Publication Date: 2016-12-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 3) High consumption of aluminu

Method used

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  • Ultra-low-carbon aluminum-killed steel vacuum carbon-loaded preliminary deoxidation process

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Experimental program
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Effect test

Embodiment 1

[0053] According to the above-mentioned ultra-low-carbon aluminum-killed steel vacuum adding carbon pre-deoxidation process, the specific steps are as follows: the molten steel reaches the vacuum treatment station to sample [O]671ppm, [C]410ppm, and the temperature is 1612℃:

[0054] 1) Calculate the amount of carbon added as 45.5kg, vacuum pump, add carbon powder in batches, add 20kg in the first batch for 5min, 20kg in the second batch in 7min, 5.5kg in the third batch in 9min, vacuum 6.7kpa;

[0055] 2) Gradually increase the vacuum degree to the ultimate vacuum degree ≤67pa, 12min fixed sample sampling [O]196ppm, [C]12ppm, add 202kg of aluminum pellets to deoxidize to the target, 23min treatment ends [C]13ppm, [O]18ppm. Temperature 1572 ℃; Compared with conventional aluminum pellets, the consumption is reduced by 0.2kg / t.

Embodiment 2

[0057] The molten steel arrives at the vacuum processing station for sampling [O]720ppm, [C]380ppm, temperature 1620℃:

[0058] 1) Calculate the amount of carbon added as 54.2kg, vacuum pump, add carbon powder in batches, add 20kg in the first batch in 5min, 20kg in the second batch in 7min, 14.2kg in the third batch in 9min, vacuum 8.1kpa;

[0059] 2) Gradually increase the vacuum degree to the ultimate vacuum degree ≤67pa, 12min fixed sample sampling [O]214ppm, [C]12ppm, add aluminum pellet 210kg deoxygenation to the target, 22min processing end [C]16ppm, [O]20ppm. Temperature 1576 ℃; Compared with conventional aluminum pellets, the consumption is reduced by 0.22kg / t.

Embodiment 3

[0061] Molten steel arrives at the vacuum processing station for sampling [O]862ppm, [C]362ppm, temperature 1634℃:

[0062] 1) Calculate the amount of carbon added as 91kg, vacuum pump, add carbon powder in batches, add 25kg in the first batch for 4min, 25kg in the second batch in 6min, 25kg in the third batch in 8min, and 16kg in the fourth batch in 10min. Vacuum 7.8kpa;

[0063] 2) Gradually increase the vacuum degree to the ultimate vacuum degree ≤67pa, 13min sample fixed sampling [O]226ppm, [C]12ppm, add 217kg aluminum pellets to deoxidize to the target, 24min treatment ends [C]15ppm, [O]21ppm. Temperature 1580 ℃; Compared with conventional aluminum pellets, the consumption is reduced by 0.24kg / t.

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Abstract

The invention discloses an ultra-low-carbon aluminum-killed steel vacuum carbon-loaded preliminary deoxidation process. The process comprises the steps that the oxygen content and temperature of molten steel of a steel sample are measured before vacuum treatment, the arrival oxygen content and the slag oxygen return amount are measured, and the amount of carbon powder needed by deoxidation is calculated; the carbon powder is added into molten powder in batches to conduct deoxidation; the final batch of carbon powder is added in 3-5 min before decarbonization stage, the time interval between the batches is 1-2 min; sampling and oxygen probing are carried out in 3-5 min after the final batch of carbon powder is added, and the oxygen content is controlled to be 150-250 ppm; according to the oxygen probing result, the number of added aluminum pellets is calculated, and sampling is conducted in 5-7 min after addition of aluminum; and oxygen probing and sampling are carried out after 20-25 min, and the whole deoxidation treatment process is completed. By means of the process, consumption of added aluminum pellets can be reduced, and the cost can be lowered; the average aluminum consumption is lowered by 0.23 kg/t, and the cost is lowered by 3.45 Yuan/t. Meanwhile, the inclusion (Al2O3) content of molten steel is reduced by 5% or more.

Description

Technical field [0001] The invention relates to metallurgical technology, in particular to a vacuum carbon addition pre-deoxidation process for ultra-low carbon aluminum killed steel. Background technique [0002] The process of molten steel deoxidation has always been an important part of the molten steel refining process. A good molten steel deoxidation process can not only reduce the consumption of deoxidizers and reduce production costs, but also help reduce deoxidation products, reduce casting slab inclusions, and improve product quality. Commonly used deoxidizing alloys mainly include Al, Si, Mn. Since Si and Mn are not completely deoxidized and have composition requirements, generally aluminum killed steel is deoxidized by Al. When the steel has a high oxygen content, it will consume a lot of aluminum shots and increase the cost. , And generate more Al 2 O 3 Inclusions reduce the purity of molten steel. Most of the product quality problems of steel grades are caused by oxi...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10
CPCC21C7/06C21C7/10
Inventor 孙伟沈武吴杰杨文军曹同友齐江华沈继胜朱万军彭著刚
Owner 武汉钢铁有限公司
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