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Vacuum carbonization pre-deoxidation process for ultra-low carbon aluminum killed steel
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An aluminum-killed steel, ultra-low carbon technology, applied in the field of metallurgy, can solve the problems of high consumption of aluminum shots and high content of inclusions, and achieve the effect of improving the purity of molten steel, reducing the content of inclusions, and reducing the consumption of aluminum shots
Active Publication Date: 2018-07-24
武汉钢铁有限公司
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[0007] 3) High consumption of aluminum shot and high content of inclusions;
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Embodiment 1
[0053] According to the above-mentioned vacuum carbonization and pre-deoxidation process of ultra-low carbon aluminum killed steel, the specific steps are as follows: when the molten steel arrives at the vacuum treatment station, sampling [O] 671ppm, [C] 410ppm, and the temperature is 1612°C:
[0054] 1) Calculate the amount of carbon added as 45.5kg, vacuum pump, add carbon powder in batches, add the first batch of 20kg in 5 minutes, the second batch of 20kg in 7 minutes, the third batch of 5.5kg in 9 minutes, and the vacuum degree is 6.7kpa;
[0055] 2) Gradually increase the vacuum degree to the ultimate vacuum degree ≤ 67pa, 12min fixed sampling [O] 196ppm, [C] 12ppm, add aluminum pellets 202kg to deoxidize to the target, 23min after treatment [C] 13ppm, [O] 18ppm. Temperature 1572 ℃; 0.2kg / t lower than conventional aluminum shot consumption.
Embodiment 2
[0057] When the molten steel reaches the vacuum treatment station, 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 the first batch of 20kg in 5 minutes, the second batch of 20kg in 7 minutes, the third batch of 14.2kg in 9 minutes, and the vacuum degree is 8.1kpa;
[0059] 2) Gradually increase the vacuum degree to the ultimate vacuum degree ≤ 67pa, 12min fixed sampling [O] 214ppm, [C] 12ppm, add aluminum pellets 210kg to deoxidize to the target, 22min treatment ends [C] 16ppm, [O] 20ppm. Temperature 1576 ℃; 0.22kg / t lower than conventional aluminum shot consumption.
Embodiment 3
[0061] When the molten steel reaches the vacuum treatment station, 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 the first batch of 25kg in 4 minutes, the second batch of 25kg in 6 minutes, the third batch of 25kg in 8 minutes, and the fourth batch of 16kg in 10 minutes. The vacuum degree is 7.8kpa;
[0063] 2) Gradually increase the vacuum degree to the ultimate vacuum degree ≤ 67pa, 13min fixed sampling [O] 226ppm, [C] 12ppm, add aluminum pellets 217kg deoxidation to the target, 24min treatment ends [C] 15ppm, [O] 21ppm. Temperature 1580 ℃; 0.24kg / t lower than conventional aluminum shot consumption.
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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 pre-deoxidation process for ultra-low carbon aluminum killed steel. Background technique [0002] The molten steel deoxidation process has always been an important link in 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 slab inclusions, and improve product quality. Commonly used deoxidation alloys mainly include Al, Si, and Mn. Due to incomplete deoxidation of Si and Mn, and composition requirements, Al is generally used for deoxidation of aluminum-killed steel. When the oxygen content of the steel is high, a large amount of aluminum pellets will be consumed, which will increase the cost. , and generate more Al 2 o 3 Inclusions reduce the purity of molten steel. The quality problems of most steel products are caus...
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