KR19990050237A - Slag Control Method of Molten Steel for Cold Rolled Sheet Material - Google Patents

Slag Control Method of Molten Steel for Cold Rolled Sheet Material Download PDF

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KR19990050237A
KR19990050237A KR1019970069313A KR19970069313A KR19990050237A KR 19990050237 A KR19990050237 A KR 19990050237A KR 1019970069313 A KR1019970069313 A KR 1019970069313A KR 19970069313 A KR19970069313 A KR 19970069313A KR 19990050237 A KR19990050237 A KR 19990050237A
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slag
molten steel
cold rolled
sheet material
control method
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KR1019970069313A
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KR100336859B1 (en
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권지태
임문석
이승계
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이구택
포항종합제철 주식회사
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00Charging; Discharging; Manipulation of charge
    • F27D3/0025Charging or loading melting furnaces with material in the solid state
    • F27D3/0026Introducing additives into the melt

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

본 발명은 극저탄소강 냉연강판 소재용 용강제조시 발생하는 슬래그의 제어방법에 관한 것으로 보다 상세하게는 중량%로 금속 Al 40% 이상, CaCO340% 이상, 기타 불가피하게 함유되는 원소로 구성되고, 출강된 용강중에 1.6∼1.8 Kg/T-S 투입되는 슬래그 제어용 조재제에 있어서, 상기 조재제를 출강초기 용탕의 풀(Pool)이 형성되는 시점에 0.3∼0.5Kg/T-S 투입하는 단계와, 출강완료후 나머지 잔부 조재제를 투입하는 단계로 이루어지는 것을 특징으로 하는 냉연강판 소재용 용강의 슬래그 제어방법에 관한 것이다.The present invention relates to a method for controlling slag generated during the manufacture of molten steel for ultra low carbon steel cold rolled sheet material, and more specifically, it is composed of elements containing 40% or more of metal Al, 40% or more of CaCO 3 by weight, and inevitably contained elements. In the slag control preparation to be injected into the molten steel 1.6 to 1.8 Kg / TS, the step of adding 0.3 to 0.5 Kg / TS at the time of forming the pool of the initial molten metal, the tapping completion It relates to a slag control method of the molten steel for cold-rolled steel sheet material, characterized in that it comprises the step of injecting the remaining residual additives.

상기와 같은 본 발명에 의해 슬래그 산화도가 안정적인 수준으로 감소할 뿐만 아니라 냉연강판의 불량에 직접적인 원인으로 작용하는 재산화물을 저감시킬 수가 있으며, 고가의 합금철 실수율을 증가시켜 원가절감을 가능하게 한다.The present invention as described above can not only reduce the slag oxidation degree to a stable level, but also can reduce the reoxidation acting as a direct cause of the failure of the cold rolled steel sheet, thereby increasing the error rate of expensive ferro-alloy to enable cost reduction. .

Description

냉연강판 소재용 용강의 슬래그 제어방법Slag Control Method of Molten Steel for Cold Rolled Sheet Material

본 발명은 극저탄소강 냉연강판 소재용 용강제조시 발생하는 슬래그의 제어방법에 관한 것으로 보다 상세하게는 제강공정 전로 출강시 슬래그 제거를 위해 첨가되는 조재제의 첨가시기를 조절하여 투입하는 것을 특징으로 하는 냉연강판 소재용 용강의 슬래그 제어방법에 관한 것이다.The present invention relates to a method for controlling slag generated during the manufacture of molten steel for ultra low carbon steel cold rolled steel sheet material, and more particularly, by adjusting the addition time of the additive added to remove the slag during the steelmaking process. It relates to a slag control method of molten steel for cold rolled steel sheet material.

종래 냉연강판 소재용 용강 제조시의 슬래그 제어 방법은 도 1에 나타낸 것과 같이 출강이 완료된 시점에 슬래그 조재제를 래들(Ladle) 상부에 투입하여 용강품질에 악영향을 미치는 저급 산화물을 제어하고 있다.In the conventional slag control method for manufacturing molten steel for cold rolled steel sheet material, as shown in FIG. 1, a slag preparation is added to a ladle at the time of finishing tapping to control lower oxides that adversely affect the quality of molten steel.

즉, 용강 품질에 악영향을 미치는 FeO 및 MnO 등의 저급산화물을 조재제에 함유된 Al을 이용하여 환원시키는 것이다.That is, lower oxides such as FeO and MnO, which adversely affect the molten steel quality, are reduced by using Al contained in the preparation agent.

일반적으로 용강품질에 안정적인 슬래그 산화도(슬래그중의 T.Fe+MnO)는 8% 이하로 보고되고 있으며, 이를 만족하기 위해 1.6∼1.8 Kg/T-S의 조재제를 투입하고 있다.Generally, the slag oxidation degree (T.Fe + MnO in slag) which is stable in molten steel quality is reported to be 8% or less, and to satisfy this, 1.6 ~ 1.8 Kg / T-S preparation agent is added.

한편, 전로에서 출강시 용강품질에 유해한 전로 슬래그는 초기부터 유출되기 시작하여 출강말기에 대량 유츌되는 경향을 보이고 있고, 따라서 말기의 슬래그뿐 아니라 초기 슬래그의 적정한 제어가 중요한 인자가 되기도 하는데, 종래 방법에 의한 슬래그 제어시 초기 유출 슬래그는 제어가 곤란하며 특히 고생산성 체제에서 슬래그 제어를 위해 필수적인 반응시간의 확보가 사실상 불가능하여 슬래그중의 슬래그 산화도는 약 12∼15% 수준을 보이고 있다.On the other hand, converter slag, which is harmful to molten steel quality when it goes out of the converter, tends to leak out at the beginning and mass flows out at the end of the tapping. It is difficult to control the initial outflow slag during slag control, and in particular, it is impossible to secure the reaction time necessary for slag control in a high productivity system, and thus the slag oxidation degree of slag is about 12-15%.

슬래그중에 저급산화물이 다량 함유된 경우 출강후 용강에 투입되는 Mn 및 Ti 등 고가의 합금철 실수율이 저하하여 원가상승 요인으로 작용하며 재산화물이 슬래그중으로 부상분리되는 경우 폐기물 양을 증가시켜 환경문제를 야기할 수 도 있다.If the slag contains a large amount of lower oxides, the error rate of expensive ferroalloys such as Mn and Ti, which is put into molten steel after the tapping, is lowered, which acts as a cost increase factor. May cause.

본 발명은 상기와 같은 문제점을 해결하기 위해서 출강초기 유츌되는 전로슬래그의 적절한 제어와 슬래그 조재제와 슬래그의 반응시간을 확보할 수 있는 냉연강판 소재용 용강의 슬래그 제어방법을 제공하는 것을 그 목적으로 한다.The present invention is to provide a slag control method of the molten steel for cold rolled steel material that can ensure the appropriate control of the converter slag in the initial tapping and the reaction time of the slag preparation and slag to solve the above problems. do.

도 1은 종래 슬래그 제어를 위한 슬래그 조재제를 투입하는 시기를 나타내는 개략도,1 is a schematic diagram showing the timing of adding a slag preparation for conventional slag control,

도 2는 본 발명에 의한 슬래그 조재제의 투입시기를 나타내는 개략도,Figure 2 is a schematic diagram showing the timing of the slag preparation according to the present invention,

도 3은 본 발명에 의한 산화도 저감량을 나타내는 그래프도이다.3 is a graph showing the reduction in oxidation degree according to the present invention.

상기와 같은 목적을 달성하기 위하여 본 발명은 중량%로 금속 Al 40% 이상, CaCO340% 이상, 기타 불가피하게 함유되는 원소로 구성되고, 출강된 용강중에 1.6∼1.8 Kg/T-S 투입되는 슬래그 제어용 조재제에 있어서, 상기 조재제를 출강초기 용탕의 풀(Pool)이 형성되는 시점에 0.3∼0.5Kg/T-S 투입하는 단계와, 출강완료후 나머지 잔부 조재제를 투입하는 단계로 이루어지는 것을 특징으로 하는 냉연강판 소재용 용강의 슬래그 제어방법을 제공한다.In order to achieve the above object, the present invention is composed of an element containing 40% or more of metal Al, 40% or more of CaCO 3 by weight, and inevitably contained, and slag control for 1.6 to 1.8 Kg / TS in the molten steel. In the rejuvenating agent, the step of adding the reconstituting agent 0.3 ~ 0.5Kg / TS at the time of forming the initial pool (Pool) of the tapping, and after the completion of the tapping is characterized in that it comprises the step of adding the remaining balance preparation Provided is a slag control method for molten steel for cold rolled steel sheet material.

이하, 본 발명의 수치한정의 이유에 대하여 설명한다.Hereinafter, the reason for numerical limitation of this invention is demonstrated.

출강 초기에 유출되는 슬래그를 제어하기 위하여 조재제를 0.3∼0.5 Kg/T-S 투입하는 이유는 상기 조재제를 0.3 Kg/T-S 미만 투입할 경우 슬래그와의 산화반응이 미약하여 슬래그를 제어할 수 없고, 0.5 Kg/T-S를 초과 투입할 경우 용강을 탈산시켜 진공탈탄과정에 필요한 용존산소를 확보하지 못하기 때문이다.The reason why 0.3 ~ 0.5 Kg / TS is added to control slag which flows out at the initial stage of tapping is that when slag is less than 0.3 Kg / TS, oxidation reaction with slag is weak and slag cannot be controlled. If more than 0.5 Kg / TS is added, the molten steel is deoxidized to obtain the dissolved oxygen required for the vacuum decarburization process.

이하, 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail.

상기와 같이 조재제의 투입시점을 나누는 이유는 종래의 방법으로는 조재제와 슬래그중의 저급산화물간의 충분한 반응시간이 부족하기 때문이었고, 그에 따라 본 발명에서와 같이 조재제를 나누어 투입함으로써 출강시간에 해당되는 4∼5분동안의 반응시간을 확보할 수 있었다.The reason for dividing the input time of the preparation as described above was that the conventional method lacked sufficient reaction time between the preparation and the lower oxide in the slag, and accordingly the tapping time by dividing the preparation as in the present invention. A reaction time of 4 to 5 minutes corresponding to the above was secured.

그러나, 상기와 같이 단순하게 반응시간의 확보만을 위해 초기에 조재제를 일괄투입하는 경우 과다한 조재제 투입은 용강을 탈산시켜 진공탈탄과정에 필요한 용존산소를 확보하지 못하는 문제가 존재하여 투입시기별 투입량의 조절이 불가피하다.However, in the case of initially adding the crude agent only to secure the reaction time as described above, excessive preparation of the crude agent deoxidizes the molten steel so that the dissolved oxygen required for the vacuum decarburization process exists, and thus the amount of each injection is added. Control is inevitable.

출강초기 유입되는 슬래그의 제어를 위한 조재제의 투입시기는 출강초기 용탕의 풀(Pool)이 형성되는 시점 즉, 용강층과 슬래그층이 분리되는 시점에 투입하는데, 상기의 시점이 지난 후 즉 출강중기 시점에서 조재제를 투입시 조재제에 함유된 메탈릭 알루미늄(Metallic Al)과 슬래그중의 저급산화물이 격렬히 반응하면서 화염이 발생하고, 조재제에 함유된 CaCO3가 CO기체와 CaO로 분리되면서 CO 기체에 의한 백연 및 분진이 다량 발생하게 된다.In the initial tapping time, the input of the preparation for the control of the incoming slag is input at the time when the pool of molten metal is formed, that is, at the time when the molten steel layer and the slag layer are separated. In the mid-term point of time, when the preparation agent is added, the metallic aluminum contained in the preparation agent and the lower oxides in the slag react violently to generate a flame, and the CaCO 3 contained in the preparation agent is separated into CO gas and CaO. A lot of white smoke and dust are generated by gas.

대부분의 경우 출강완료 판정은 출강류의 흐름을 육안으로 관측하면서 기 사용중인 슬래그 유출 검지장치를 이용하여 슬래그 체크 볼(Slag Check Ball)을 위시한 복합적인 방법으로 출강을 완료하고 있다.In most cases, the completion of the tapping is completed by using the slag check ball, which uses a slag outflow detector, while visually monitoring the flow of tapping.

그러나 중기에 슬래그 조재제가 투입되는 경우 상기와 같은 이유로 백연 및 화염에 의해 출강류의 육안판정이 방해를 받아 오히려 출강말기에 전로슬래그의 다량 유츌이 발생하여 품질에 악영향을 미칠 수도 있다.However, when the slag preparation is introduced in the middle, the visual judgment of the tapping flow is hindered by white lead and flame for the same reason as above. Therefore, a large amount of converter slag may be generated at the end of the tapping, which may adversely affect the quality.

이하, 본 발명을 실시예를 들어 보다 상세하게 설명한다.Hereinafter, an Example is given and this invention is demonstrated in detail.

조재제의 출강시점별 투입량은 출강초기 용탕에 풀이 형성되는 시점에 0.46 Kg/T-S을 투입하였고, 출강완료후 1.22 Kg/T-S의 조재제를 투입하였다.As for the amount of preparation by tapping time, 0.46 Kg / T-S was added at the beginning of tapping, and 1.22 Kg / T-S was added after finishing tapping.

도 3은 상기와 같은 본 발명의 제어방법을 이용하여 실험한 결과를 나타내고 있으며, 기존방법에 비하여 약 3% 이상의 슬래그 산화도 저감효과를 보여주고 있다.Figure 3 shows the results of the experiment using the control method of the present invention as described above, and shows an effect of reducing the slag oxidation degree of about 3% or more compared to the existing method.

한편, 출강 1/2 시점에서 조재제를 투입하고 출강완료 시점에서 잔부 조재제를 투입하는 경우에도 상기의 실시예와 동등한 수준의 산화도 저감효과를 나타내나, 소재와 슬래그 사이의 격렬한 반응에 의한 화염 및 분진에 의해 작업성면에서 매우 열악하였다.On the other hand, in the case of inputting the preparation at the time of tapping 1/2 and the addition of the remaining preparation at the time of tapping, the same degree of oxidation reduction is achieved as in the above embodiment, but due to the violent reaction between the material and the slag. It was very poor in workability by flame and dust.

상기와 같은 본 발명에 의해 슬래그 산화도가 안정적인 수준으로 감소할 뿐만 아니라 냉연강판의 불량에 직접적인 원인으로 작용하는 재산화물을 저감시킬 수가 있으며, 고가의 합금철 실수율을 증가시켜 원가절감을 가능하게 한다.The present invention as described above can not only reduce the slag oxidation degree to a stable level, but also can reduce the reoxidation acting as a direct cause of the failure of the cold rolled steel sheet, thereby increasing the error rate of expensive ferro-alloy to enable cost reduction. .

Claims (1)

중량%로 금속 Al 40% 이상, CaCO340% 이상, 기타 불가피하게 함유되는 원소로 구성되고, 출강된 용강중에 1.6∼1.8 Kg/T-S 투입되는 슬래그 제어용 조재제에 있어서,In the slag control preparation composed of elements containing 40% or more of metal Al, 40% or more of CaCO 3 and other unavoidable elements by weight, and 1.6 to 1.8 Kg / TS are added to the molten steel. 상기 조재제를 출강초기 용탕의 풀(Pool)이 형성되는 시점에 0.3∼0.5Kg/T-S 투입하는 단계와;Adding 0.3 to 0.5 Kg / T-S at the time when the pool of the initial molten metal is formed; 출강완료후 나머지 잔부 조재제를 투입하는 단계로 이루어지는 것을 특징으로 하는 냉연강판 소재용 용강의 슬래그 제어방법.The slag control method of the molten steel for cold rolled steel material, characterized in that the step consisting in the remaining step after the completion of the tapping step.
KR1019970069313A 1997-12-16 1997-12-16 Control method of converter slag KR100336859B1 (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
KR100402011B1 (en) * 1999-10-11 2003-10-17 주식회사 포스코 Method for improving desulfurization ratio of desiliconized molten pig iron in hot metal pretreatment
KR100887132B1 (en) * 2002-08-20 2009-03-04 주식회사 포스코 Method for Tapping Molten Steel in Converter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100402011B1 (en) * 1999-10-11 2003-10-17 주식회사 포스코 Method for improving desulfurization ratio of desiliconized molten pig iron in hot metal pretreatment
KR100887132B1 (en) * 2002-08-20 2009-03-04 주식회사 포스코 Method for Tapping Molten Steel in Converter

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