Method for smelting low-carbon aluminium-killed steel and method for continuously casting low-carbon aluminium-killed steel

A low-carbon aluminum killed steel, continuous casting technology, applied in the direction of manufacturing converters, etc., can solve the problems of affecting the quality of continuous casting slabs, affecting the flow speed of molten steel, and fluctuation of continuous casting pulling speed, etc., to improve the quality of continuous casting production. , The effect of reducing the oxygen content and stabilizing the pulling speed

Inactive Publication Date: 2011-05-11
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When continuously casting low-carbon aluminum-killed steel, inclusions in molten steel tend to form nodules at the pouring nozzle, which seriously affects the flow rate of molten steel and causes great fluctuations in casting speed, affecting continuous casting production and slab quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] During composite blowing, top-blown pure oxygen is 20,000-30,000 standard cubic meters per hour, and bottom-blown pure argon has an intensity of 0.015-0.045Nm 3 / ton of molten steel min, blowing argon gas at the bottom for 6-10min after tapping, with a strength of 0.1-3Nm 3 / ton of molten steel min, to carry out intensified stirring before tapping, so that the oxygen content of molten steel is 100-600ppm when tapping; when tapping, the slag is blocked so that the total content of FeO and MnO is 3% by weight and in tapping 1 / At 3 o'clock, add the aluminum-iron deoxidizer (Al content is 45% by weight) of 1kg / ton molten steel to carry out pre-deoxidation, make the oxygen content of molten steel be 10-50ppm; Carry out feeding aluminum 0.3kg / ton once in the argon station after tapping 5min Molten steel, so that the oxygen content of molten steel is 2-10ppm, and the intensity of argon blowing is 0.4Nm 3 / ton of molten steel min, the time is 6min; the molten steel is refi...

Embodiment 2

[0024]Carry out continuous casting according to the method for embodiment 1, difference is, the slag blocking when tapping makes the total content of FeO and MnO be 3.6% and add the aluminum-iron deoxidizer of 0.7kg / ton of molten steel ( Al content is 60% by weight) to carry out pre-deoxidation, so that the oxygen content of molten steel is 60-100ppm; 2min after tapping, feed aluminum 0.1kg / ton molten steel once, so that the oxygen content of molten steel is 10-30ppm; molten steel passes through the LF furnace Refining to obtain C 0.02-0.05%, O 2-10ppm, Al 0.05-0.06%, Si 0-0.03%, Mn0.20-0.25% Stb34 molten steel, wherein 0.5kg / ton of molten steel is fed aluminum twice during LF furnace refining.

Embodiment 3

[0026] Carry out continuous casting according to the method for embodiment 1, difference is, when tapping, the slag blocking makes the total content of FeO and MnO be 4% and add the aluminum-iron deoxidizer (Al of 1kg / ton of molten steel when tapping 3 / 4) content is 65% by weight) to carry out pre-deoxidation, so that the oxygen content of molten steel is 30-60ppm; 15min after tapping, feed aluminum 0.8kg / ton molten steel once, so that the oxygen content of molten steel is 10-30ppm; molten steel is refined through LF furnace Obtain C 0.02-0.07% by weight, O 2-10ppm, Al 0.03-0.06% by weight, Si 0-0.04% by weight, Mn 0.25-0.30% by weight Stb32 molten steel, wherein 1kg / ton of molten steel is fed aluminum twice during LF furnace refining .

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PUM

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Abstract

The invention provides a method for smelting low-carbon aluminium-killed steel, comprising the following steps: carrying out primary smelting by adopting a converter top and bottom combined blowing way, and then tapping molten steel obtained by the primary smelting into a steel ladle; blocking slag and predeoxidising in the tapping process, wherein the slag is blocked to ensure that the total content of FeO and MnO which enter the steel ladle is 3-5wt% of the molten steel entering the steel ladle, and the predeoxidising operation comprises the step of adding ferro-aluminium deoxidizer into the molten steel and can ensure that the oxygen content of the molten steel is 10-100ppm; carrying out primary aluminium feeding on the molten steel in the steel ladle before the molten steel in the steel ladle is refined after tapping is completed; refining the molten steel after the primary aluminium feeding is completed, and carrying out secondary aluminium feeding in the refining process; and removing impurities floating on the liquid surface of the molten steel. The invention also provides a method for continuously casting the low-carbon aluminium-killed steel, comprising the following steps: pouring the molten steel obtained by adopting the method for smelting the low-carbon aluminium-killed steel into a crystallizer, and continuously pulling and cooling. By adopting the method for smelting the low-carbon aluminium-killed steel, the purity of the molten steel can be obviously improved, and the accretion in the continuous casting process can be reduced.

Description

technical field [0001] The invention relates to a method for smelting low-carbon aluminum-killed steel and a method for continuously casting low-carbon aluminum-killed steel. Background technique [0002] Continuous casting is a commonly used iron and steel casting process at present. Specifically, the smelted molten steel is poured into a tundish (which can hold dozens of tons of molten steel)), and the liquid molten steel flows vertically through the small holes under the tundish to different places. in a vibrating crystallizer. The mold is continuously cooled with high-pressure water, and the molten steel forms a solid state in the mold and a liquid state in the interior. Outside the crystallizer is an arc-shaped cooling roller table, on which the casting slab is pulled and passed through the water cooling zone and the air cooling zone in sequence to obtain a solid casting slab. [0003] When continuously casting low-carbon aluminum-killed steel, inclusions in molten st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C7/06B22D11/16
Inventor 李利刚杨森祥雷辉黄登华
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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