CN101333617A - Stabilizing process for treating aluminium-silicon killed steel by sealed argon-blowing method - Google Patents
Stabilizing process for treating aluminium-silicon killed steel by sealed argon-blowing method Download PDFInfo
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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
The present invention relates to the killed steel smelting technology, particularly the stabilization process of aluminium-silicon killed steel by sealed argon-blowing method (CAS) processing.
Background technology
Aluminium-Si killed steel is smelted generally all will add in converter and is increased the C agent, therefore the phenomenon that produces the bubble slag is very general, causes that bubble slag reason is many-sided, after converter tapping adding carburelant, lighter tiny C grain accumulates in steel-slag interface and carries out oxidizing reaction, the CO of generation
2Gas enters the slag phase, because the tension force effect on slag surface, a large amount of gas hold-ups increase to more than several times of reality to liquid slag volume, thickness as blowing up a balloon in slag.Second kind of situation is that molten steel temperature too high (＞1625 ℃) causes, because molten steel temperature height, the heat diffusion value is also high, the temperature of slag is also high more to all kinds of Gas Solubility with it, air content is just abundant more in the slag, the volume of bits and thickness are severe more with regard to expansible, and so-called bubble slag also forms like this.Bubble slag phenomenon during reality is produced is caused jointly by two or more reasons mostly, therefore will solve bubble slag problem and must carry out comprehensive analysis, adopts multiple measure.
Therefore, the CAS that adopt dealt with bubble slag problem more during aluminium-Si killed steel was smelted.
It is that the sealed argon-blowing alloying constituent is adjusted (Composition Adjustment by SsaledAr-gon Bubbling) that CAS handles, and it is that form by bottom blowing Ar drives the molten steel circulation, and the soaking tub by the top drops into alloy to molten steel then.The shortcoming of this technology is that the efficient of its processing and success ratio are limited by the quality of ladle bottom blowing Ar, and reason is to blow the recovery rate that the Ar power directly has influence on various alloying elements.Especially for smelting medium carbon steel; because it is higher to the requirement of blowing the Ar situation to add the carbon process; blow the excessive C particle of Ar flow and can have little time to be rolled out soaking tub under the dissolved situation; and on float between the outer steel-slag interface of soaking tub; not only influence the recovery rate of [c]; in case oxygen reacts in C grain and the slag, can cause bubble slag even excessive slag accident.Blow the too small C powder that then adds of Ar flow and other alloys and have little time dissolving, lump easily and block soaking tub, make CAS equipment be absorbed in the predicament that can't continue operation.Therefore, aluminium-Si killed steel handle to be difficulty relatively at CAS, because the bits foaming of ladle uneven components or molten steel surface can cause CAS miscalculation alloy amount and can not normal processing.So the cycle of generally handling is longer, molten steel composition is all implemented with the pattern of twice adjustment basically.
During CAS handles, in order to guarantee the qualification rate of medium carbon steel composition, processing to aluminium-Si killed steel to be smelted difficulty and is improved qualification rate in order to reduce, add high manganese as far as possible and reach the purpose that increases [C], because containing, one ton of Gao Meng can increase [C] the 0.02%th, very reliable and stable, and there is not secondary do effect, but for aluminium-Si killed steel, because finished product [Mn] scope is in 0.6%, the H-Mn add-on that allows is about the 1-2 ton, [C] will be joined into composition scope (0.145%-0.185%) also need add and increase C agent 200-300Kg, these increase the C agent and add its recovery rate of back to be blown the influence of Ar situation bigger, some adds the heat of C recovery rate difference for the first time, and the uncertain difficulty that becomes because of time carbon amount when its secondary alloy is adjusted is very big.Therefore add the method that H-Mn neither solve whole issue.Another kind of commonly used method is exactly to wait sample to handle, two of not all right grades, and three of two not all right grades, and will draw the processing cycle very long like this, logistics there is considerable influence.
Summary of the invention
The stabilization process that the object of the present invention is to provide a kind of aluminium-silicon killed steel by sealed argon-blowing method to handle makes CAS stably manufactured aluminium-Si killed steel more, has reduced the retention rate and the treatment time of this steel grade; A hit rate of composition adjustment is largely increased.
For achieving the above object, technical scheme of the present invention is,
The stabilization process that aluminium-silicon killed steel by sealed argon-blowing method is handled, it comprises the steps:
1) aluminium-silicon killed steel, its composition quality per-cent is: C 0.156～0.185, Si 0.46～1.05, Mn 0.30～0.45, Al 0.025～0.045, surplus Fe;
2) after the aluminium-silicon killed steel converter smelting finishes, ladle bottom blowing Ar implements to stir to molten steel, with even molten steel composition, inclusion floating, uniform temperature; Produce the bubble slag thus, then press slag:
A, molten steel contain [Al] amount＜0.035, liquid steel temperature＜1625 ℃; Liquid steel temperature is to top of the slag air-drop Al or aluminium slag, and add-on=(Al in the 0.035-ladle) % * 300T * 1000KG adds the back stirring and stopped to blow Ar in 3-4 minute, and the top of the slag carries out big flow once more after calm 2-3 minute and blows Ar, and the stirring flow is 600l/min＜f
Ar≤ 1500l/min;
[Al]＜0.035, it is low to contain Al, illustrates that deoxidation is incomplete, possesses the aluminum strip spare of adding, but the Yin Wendu appropriateness,＜1625 ℃, need not add cold material cooling, therefore, pressure slag method in this case adopts: Al or aluminium slag;
B, molten steel contain [Al] amount＜0.035, liquid steel temperature＞1625 ℃; Add Al or aluminium slag, add-on=(0.035-ladle Al) % * 300T * 1000KG; Add the cooling of cold material, 7 ℃ of add-ons=(arrive CAS temperature-1625 ℃) ÷ add and stop to blow Ar after keeping stirring in 3-4 minute behind the alloy, and the top of the slag carries out big flow once more after calm 2-3 minute and blows Ar, and the stirring flow is 600l/min＜f
Ar≤ 1500l/min;
It is low to contain Al, illustrates that deoxidation is incomplete, possesses the aluminum strip spare of adding, and the temperature height, also need add cold material simultaneously and suitably lower the temperature by＞1625 ℃;
C, molten steel contain [Al] amount＞0.045, liquid steel temperature＞1625 ℃; Add cold material and stir cooling and press slag, 7 ℃ of cold material add-ons=(arrive CAS temperature-1625 ℃) ÷ are blown Ar and are stirred and keep stopping to blow Ar after 3-4 minute, and the top of the slag carries out big flow once more after calm 2-3 minute and blows Ar, and the stirring flow is 600l/min＜f
Ar≤ 1500l/min;
The temperature height,＞1625 ℃, the operation of need lowering the temperature, while invar liquid contains [Al] height can not implement to add aluminium pressure slag, so slag is pressed in the measure of taking in the case to add cold material stirring cooling;
3) composition adjustment adds different-alloy on request according to sample analysis, the reinforced Ar that blows simultaneously;
Blow that the molten steel bare area reaches 2/3 of soaking tub internal diameter in the ladle that Ar causes, add alloy with 1000～1500kg/min speed; Afterwards, pure stirring is 6-8 minute;
Blow molten steel bare area that Ar causes less than 1/2 of soaking tub internal diameter, rate of feeding is 800-950kg/min, afterwards, and pure stirring 8-11 minute;
Blow molten steel bare area that Ar causes less than 1/3 of soaking tub internal diameter, feed rate is 300-500kg/min, afterwards, and pure stirring 10-14 minute.
In addition, cold material of the present invention adopts steel scrap.
CAS carries out " pressure slag " operation before handling, and purpose has two: one, will cause that by pressing the slag operation C particle that accumulates in steel-slag interface of bubble slag is dissolved in the molten steel, is convenient to accurately calculate the add-on that increases the C agent in the CAS processing.The 2nd, calm down bits, reach by blowing Ar and make the exposed purpose of molten steel, be inserted into the minimum quantity of slag that the degree of depth and cover are accurately gone into to guarantee soaking tub, be beneficial to increase adding, the dissolving of C agent and other alloy.The method of pressing slag be by bottom blowing Ar molten steel is implemented strong mixing and according to the deoxidation degree of molten steel, liquid steel temperature to an amount of Al (or aluminium slag), the cold material of top of the slag air-drop, add back stirring stopping to blow Ar, allowing and separate out because of gas in the slag after the top of the slag calmness, can slightly crust, become fragile in the bits surface.Carry out big flow again this moment and stir, can subdue the bubble slag.
Blow the Ar quality and must confirm the degree that blows open of the top of the slag at the scene, and not simple basis is blown the Ar flow and is judged, because blowing Ar mechanism, ladle forms by many metallic hard pipe coupling, its interface, elbow are a lot, hot soak condition again, therefore the probability of revealing is very big, so the flow that instrument shows not necessarily is blown into the flow of molten steel really, under the prerequisite that the Argon situation is confirmed, CAS must take different measures according to practical situation in handling.
Beneficial effect of the present invention
1. adopt the present invention to make CAS stably manufactured aluminium-Si killed steel more, reduced the retention rate and the treatment time of this steel grade.
2. the composition adjustment hit rate is largely increased.
Embodiment
Ladle of the present invention arrives after-blow Ar and stirs two minutes (or pressing slag to handle), get and handle preceding sample analysis, according to estimation weighing alloy and processing in advance, handling about two minutes analytical values of beginning arrives, add alloy and carry out the temperature adjustment according to analytical value, restir 6-8 minute, handle and once finish.
Blow Ar control:
Normal flow 400-600l/min under the normal circumstances, stir flow 300-500l/min, reveal or blow the Ar situation and do not reach when requiring blowing the Ar system, take the mode of artificial judgment and manual regulation valve aperture to regulate and blow the Ar effect, control criterion is that the molten steel bare area is 2/3 of dipping internal diameter; But the raising of manual regulation valve aperture was not blown Ar intensity to the needs state when practical situation reached.Alloy adds speed according to blowing the strong and weak motor-driven adjustment of Ar, and standard is a putty not in the soaking tub, long-pending piece.
Operation alloy addition before the detail knowledge, relatively stable because of all the other yield of alloy, so emphasis is to hold to add the C amount, preceding operation increases the recovery rate of C agent to be calculated by 85%-80%, and CAS adds the carburelant recovery rate and adjusts between 85%-95% according to blowing the Ar power.
Molten steel to the bubble slag is pressed the slag operation
A, molten steel contain [Al] low (＜0.035%), illustrate that deoxidation is incomplete, and molten steel contains [Al] low (＜0.035%), possesses the aluminum strip spare of adding, while Yin Wendu appropriateness, temperature＜1625 ℃ need not add cold material cooling, therefore, pressure slag method in this case is: add Al or aluminium slag [adding Al=(0.035-ladle Al) % * 300T * 1000KG], stop to blow Ar after keeping stirring in 3-4 minute, allow the top of the slag carry out big flow once more after calm 2-3 minute and blow Ar, flow is 650l/min;
B, molten steel contain [Al] low (＜0.035%)+temperature height (＞1625 ℃), illustrate that deoxidation is incomplete, and that molten steel contains [Al] is low, possess the aluminum strip spare of adding, and suitably lower the temperature because of the temperature height also need add cold material simultaneously.Pressing the slag method in this case is to add Al (or aluminium slag) [adding Al=(0.035-ladle Al) % * 300T * 1000KG]+cold material cooling [add-on=(arrive CAS temperature-1625 ℃) ÷ 7], keep stopping to blow Ar after the stirring in 3-4 minute after adding alloy, allow the top of the slag carry out big flow once more after calm 2-3 minute and blow Ar, flow 1500l/min; Target temperature is 1605 ℃ behind the pressure slag.
C, molten steel contain [Al] height+temperature height (＞1625 ℃), the operation of need lowering the temperature of invar liquid temp height, while invar liquid contains [Al] height can not implement to add aluminium pressure slag, so slag is pressed in the measure of taking in the case to add cold material stirring cooling, stop to blow Ar after keeping stirring in 3-4 minute, allow the top of the slag carry out big flow once more after calm 2-3 minute and blow Ar, flow 1200l/min.Target temperature is 1605 ℃ behind the pressure slag.
Soaking tub can not insert the top of the slag when adding alloy by above-mentioned rule, stirs in order to avoid influence the top of the slag.
Table 1
As can be seen from Table 1, behind employing the present invention, CAS handles a hit rate of aluminium-Si killed steel C composition and brings up to 92% by 85.3%, and the processing cycle foreshortened to 27 minutes by 32 minutes, and the rate that is smelt brings up to 99.% by 94%.Obtained good effect.
Claims (2)
1. the stabilization process handled of aluminium-silicon killed steel by sealed argon-blowing method, it comprises the steps:
1) aluminium-silicon killed steel, its composition quality per-cent is: C 0.156～0.185, Si 0.46～1.05, Mn 0.30～0.45, Al 0.025～0.045, surplus Fe;
2) after the aluminium-silicon killed steel converter smelting finishes, ladle bottom blowing Ar implements to stir to molten steel, with even molten steel composition, inclusion floating, uniform temperature; Produce the bubble slag thus, then press slag:
A, molten steel contain [Al] amount＜0.035, liquid steel temperature＜1625 ℃; Liquid steel temperature is to top of the slag air-drop Al or aluminium slag, and its add-on=(Al in the 0.035-ladle) % * 300T * 1000KG adds the back stirring and stopped to blow Ar in 3-4 minute, and the top of the slag carries out big flow once more after calm 2-3 minute and blows Ar, and the stirring flow is 600l/min＜f
Ar≤ 1500l/min;
B, molten steel contain [Al] amount＜0.035, liquid steel temperature＞1625 ℃; Add Al or aluminium slag, add-on Al=(0.035-ladle Al) % * 300T * 1000KG, add cold material cooling, 7 ℃ of add-ons=(arrive in CAS temperature-1625 ℃) ÷, keep stopping to blow Ar after the stirring in 3-4 minute after adding alloy, the top of the slag carries out big flow once more after calm 2-3 minute and blows Ar, and the stirring flow is 600l/min＜f
Ar≤ 1500l/min;
C, molten steel contain [Al] amount＞0.045, liquid steel temperature＞1625 ℃; Add cold material and stir cooling and press slag, 7 ℃ of cold material add-ons=(arrive CAS temperature-1625 ℃) ÷ are blown Ar and are stirred and keep stopping to blow Ar after 3-4 minute, and the top of the slag carries out big flow once more after calm 2-3 minute and blows Ar, and the stirring flow is 600l/min＜f
Ar≤ 1500l/min;
3) composition adjustment adds different-alloy on request according to sample analysis, the reinforced Ar that blows simultaneously;
Blow that the molten steel bare area reaches 2/3 of soaking tub internal diameter in the ladle that Ar causes, add alloy with 1000～1500kg/min speed; Afterwards, pure stirring is 6-8 minute;
Blow molten steel bare area that Ar causes less than 1/2 of soaking tub internal diameter, rate of feeding is 800-950kg/min, afterwards, and pure stirring 8-11 minute;
Blow molten steel bare area that Ar causes less than 1/3 of soaking tub internal diameter, feed rate is 300-500kg/min, afterwards, and pure stirring 10-14 minute.
2. the stabilization process that aluminium-silicon killed steel by sealed argon-blowing method as claimed in claim 1 is handled is characterized in that, described cold material adopts steel scrap.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105861781A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Refining method for silicon-killed steel ANS process |
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| CN100372948C (en) * | 2005-04-22 | 2008-03-05 | 涟源钢铁集团有限公司 | Low-silicon low-carbon aluminium full killed steel refining method |
| CN100436627C (en) * | 2006-02-11 | 2008-11-26 | 湖南华菱涟源钢铁有限公司 | Process for producing C-Mn-Al killed steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105861781A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Refining method for silicon-killed steel ANS process |
| CN105861781B (en) * | 2015-01-23 | 2017-09-26 | 鞍钢股份有限公司 | A kind of method of refining of Si killed steel through ANS OB techniques |
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