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Stabilizing process for treating aluminium-silicon killed steel by sealed argon-blowing method

A silicon-killed steel, sealed argon blowing technology, applied in the field of killed steel smelting, can solve the problems of long processing cycle, logistics impact, etc., achieve the effect of improving the first-time hit rate, reducing the retention rate and processing time

Active Publication Date: 2008-12-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another commonly used method is to wait for the samples to be processed. If one fails, wait for two, and if two fail, wait for three. This will lengthen the processing cycle and have a great impact on logistics.

Method used

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  • Stabilizing process for treating aluminium-silicon killed steel by sealed argon-blowing method

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Embodiment Construction

[0027] After the ladle of the present invention arrives, blow Ar and stir for two minutes (or carry out slag pressing treatment), take the sample before treatment for analysis, weigh the alloy according to the estimation and process it first, and the analysis value arrives in about two minutes after the treatment starts, and add alloy and carry out according to the analysis value Adjust the temperature, stir for another 6-8 minutes, and complete the treatment once.

[0028] Blow Ar control:

[0029] Under normal circumstances, the standard flow rate is 400-600l / min, and the stirring flow rate is 300-500l / min. When the Ar blowing system leaks or the Ar blowing condition does not meet the requirements, the Ar blowing effect is adjusted by manual judgment and manual adjustment of the valve opening. The control standard is that the exposed area of ​​molten steel is 2 / 3 of the inner diameter of immersion; but when the actual situation is not reached, manually adjust the valve openi...

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Abstract

The invention discloses a stabilization process for processing by an aluminum-silicon killed steel sealed argon bubbling method, comprising the following steps of: 1) aluminum-silicon killed steel with compositions of, in weight percent: C 0.156 to 0.185, Si 0.46 to 1.05, Mn 0.30 to 0.45, Al 0.025 to 0.045, balance Fe; 2) stirring the molten steel by Ar blowing on a ladle bottom for equalizing molten steel compositions, upfloating inclusions and equalizing temperature after finishing the smelting in an aluminum-silicon killed steel converter; thereby producing frothy slag and then pressing the slag; and 3) composition adjustment, different alloys are added as required according to the sample analysis, meanwhile blowing Ar when charging materials. The adoption of the process can make CAS produce aluminum-silicon killed steel more stably, and the retention rate and processing time of the steel grade are reduced; and the first-hit yield of composition adjustment is greatly increased.

Description

technical field [0001] The invention relates to the smelting technology of killed steel, in particular to the stabilization process of aluminum-silicon killed steel treated by sealed argon blowing method (CAS). Background technique [0002] The smelting of aluminum-silicon killed steel generally requires the addition of C-increasing agents in the converter, so the phenomenon of slag generation is very common. There are many reasons for the slag formation. Collected at the steel-slag interface for oxidation reaction, the generated CO 2 The gas enters the slag phase, and due to the tension on the surface of the steel slag, a large amount of gas stays in the slag, which increases the volume and thickness of the liquid steel slag to more than several times the actual one like blowing a balloon. The second case is caused by too high temperature of molten steel (>1625°C), because the temperature of molten steel is high, the heat diffusion value is also high, the temperature of...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/00C21C7/072C21C7/06C22C38/06
Inventor 陆国弟李洪涛龚兴东马志刚
Owner BAOSHAN IRON & STEEL CO LTD