KR20000026874A - Tundish flux containing graphite - Google Patents

Tundish flux containing graphite Download PDF

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Publication number
KR20000026874A
KR20000026874A KR1019980044605A KR19980044605A KR20000026874A KR 20000026874 A KR20000026874 A KR 20000026874A KR 1019980044605 A KR1019980044605 A KR 1019980044605A KR 19980044605 A KR19980044605 A KR 19980044605A KR 20000026874 A KR20000026874 A KR 20000026874A
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South Korea
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molten steel
graphite
tundish
thermal insulation
insulation material
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KR1019980044605A
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Korean (ko)
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차대환
최웅렬
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이구택
포항종합제철 주식회사
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Priority to KR1019980044605A priority Critical patent/KR20000026874A/en
Publication of KR20000026874A publication Critical patent/KR20000026874A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: A tundish flux containing graphite is provided to improve work efficiency by minimizing the generation of dust when a flux is injected after it is made up into a granule, to prevent the re-oxidation of a molten metal by securing a spreading property and to save cost. CONSTITUTION: A tundish flux containing graphite is composed of SiO2: 60 to 65%, CaO: 1 to 2%, Al2: 10 to 15%, Glass: free, C: 10 to 14%, graphite: 2 to 8.5% and other impurities. The tundish flux is inflated at a high temperature and changed into a powder type, and its volume is increased as it contains graphite. The effect of preventing re-oxidation is improved since the contact with the air of the molten metal is perfectly blocked by the change of graphite, and the effect of keeping the molten metal is improved.

Description

흑연 함유 턴디쉬 용강 보온재Tungsten molten steel thermal insulation containing graphite

본 발명은 제철소의 연주 공정에서 용강이 턴디쉬에 머무는 동안 대기에 의한 재산화와 온도 저하를 방지하기 위하여 사용되는 용강 보온재에 관한 것으로, 보다 상세하게는 용강의 청정도를 향상시킬 뿐만 아니라 사용량을 감소시켜 원가를 절감할 수 있는 흑연 함유 턴디쉬 용강 보온재에 관한 것이다.The present invention relates to a molten steel thermal insulation material used to prevent reoxidation and temperature decrease by the atmosphere during the molten steel stays in the tundish in the regeneration process of the steel mill, and more particularly, it not only improves the cleanliness of the molten steel but also reduces the amount used. It relates to a graphite-containing tundish molten steel insulation material that can reduce the cost.

일반적으로 턴디쉬 용강 보온재(Tundish Flux)는 과립이나 분말상의 두가지 형태를 가지고 있으며, 용강 보온재는 용강 상면에서 용융되거나 본래 형상으로 유지되면서 균일하게 퍼져 대기와의 접촉을 방지하여 용강의 재산화를 방지하고 청정도를 확보하며 용강의 온도 저하를 방지한다.Generally, Tundish Flux has two forms of granule or powder, and molten steel insulation is melted on the upper surface of molten steel or kept in its original shape and spreads uniformly to prevent contact with the atmosphere to prevent reoxidation of molten steel. It ensures cleanliness and prevents the temperature drop of molten steel.

그러나, 과립의 경우 용강 보온재를 용강에 투입후 용강 상면에서 균일하게 퍼져야함에도 불구하고 퍼짐성이 불량하며 보온재층의 기공들에 의해 용강이 대기와 접촉하게 되어 재산화 방지 효과가 불량하며, 분말 형태의 보온재인 경우 퍼짐성은 양호하나 투입시 분진이 다량 발생하여 작업성이 불량한 문제점이 존재하였다.However, in the case of granules, despite the fact that the molten steel insulating material should be spread evenly on the upper surface of the molten steel after being poured into the molten steel, the spreadability is poor. In the case of the insulating material, the spreadability is good, but there was a problem in that workability was poor due to a large amount of dust generated at the time of inputting.

또한, 주조 작업시 마다 용강 보온재를 투입하는데, 투입량이 많아 작업자의 부하가 과중하게 되고, 제조 원가도 증가하는등 문제가 존재하였다.In addition, there is a problem that the molten steel thermal insulation material is put in each casting operation, the input amount is large, the worker's load is heavy, the manufacturing cost is also increased.

본 발명은 상기 설명한 종래기술의 문제점을 해결하기 위하여 이루어진 것으로, 용강 보온재를 과립 형태로 만들어 투입시 분진 발생을 최소화하여 작업성을 개선하고 용강 상면에서 열에 의해 분말 형태로 팽창, 용융되므로써 퍼짐성을 확보하여 용강 재산화 방지와 보온성을 향상시키며, 고온에서의 팽창으로 인한 부피 증가로 투입량 감소에 의한 원가 절감을 도모할 수 있는 흑연 첨가 용강 보온재를 제공함에 그 목적이 있다.The present invention has been made to solve the problems of the prior art described above, by making the molten steel thermal insulation material in the form of granules to minimize dust generation during input to improve workability and ensure the spreadability by expanding and melting in the form of powder by heat on the upper surface of the molten steel The purpose of the present invention is to provide molten steel thermal insulation material which can prevent cost reduction by reducing the input amount by increasing the volume due to expansion at high temperature.

도 1 은 턴디쉬 용강에 투입된 보온재의 작용을 보이기 위한 도면,1 is a view for showing the action of the thermal insulation material injected into the tundish molten steel,

도 2 는 용강 보온재중 흑연의 적정 함유량 범위를 보이기 위한 그래프도,2 is a graph for showing a proper content range of graphite in the molten steel insulation;

도 3 은 본 발명의 보온재와 종래 보온재 사용시의 용강 청정도를 비교하여 나타낸 그래프도,3 is a graph showing a comparison between the molten steel cleanliness when using the heat insulating material and the conventional heat insulating material of the invention,

도 4 는 본 발명의 보온재와 종래 보온재 사용할 때의 보온 효과를 비교하여 나타낸 그래프도이다.Figure 4 is a graph showing the thermal insulation effect when using the thermal insulation material and the conventional thermal insulation material of the present invention.

상기 목적을 달성하기 위한 본 발명의 흑연 함유 턴디쉬 용강 보온재는, 용강의 재산화를 방지하고 보온성을 향상시키기 위해 턴디쉬내 용강에 투입되는 용강 보온재로서, 중량%로, SiO2: 60∼65%, CaO: 1∼2%, Al2O3: 10∼15%, 유리(Free) 탄소(C): 10∼14%, 흑연: 2∼8.5%, 기타 불순물로 이루어지는 것을 특징으로 하는 구성이다.The graphite-containing tundish molten steel thermal insulation material of the present invention for achieving the above object is a molten steel thermal insulation material that is added to molten steel in the tundish to prevent reoxidation of molten steel and to improve the insulation, by weight%, SiO 2 : 60 to 65 %, CaO: 1 to 2%, Al 2 O 3 : 10 to 15%, free carbon (C): 10 to 14%, graphite: 2 to 8.5%, and other impurities .

이하에서는 양호한 실시예와 관련하여 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the preferred embodiments.

본 발명의 흑연 함유 턴디쉬 용강 보온재는 종래 함유하지 않았던 흑연을 함유한 것이 특징인데, 흑연을 함유함에 따라 고온에서 팽창하여 분말 형태로 변화하게 되며, 부피도 증가한다.The graphite-containing tundish molten steel thermal insulation material of the present invention is characterized by containing graphite which is not conventionally contained, and expands at a high temperature to change into a powder form as the graphite is contained, and the volume also increases.

흑연의 이러한 변화에 의해 용강의 대기와의 접촉이 완전 차단되어 재산화 방지 효과가 향상되며, 용강 보온 효과가 향상되는 것이다.This change of graphite completely blocks the molten steel's contact with the atmosphere, thereby improving the reoxidation prevention effect and improving the molten steel thermal insulation effect.

본 발명의 턴디쉬 용강 보온재의 성분 수치를 한정한 이유를 설명하면 다음과 같다.The reason for limiting the component value of the tundish molten steel insulation of the present invention is as follows.

SiO2는 용강 슬래그의 주성분을 이루는 것으로 슬래그의 점도에 영향을 미치므로 60∼65%로 한정한다.SiO 2 forms the main component of molten steel slag and affects the viscosity of slag, so it is limited to 60 to 65%.

CaO 는 용강의 슬래그를 구성하는 염기성 산화물로 작용하며, 용융 슬래그의 유동성에 미치는 영향을 고려하여 1∼2%로 한정한다.CaO acts as a basic oxide constituting slag of molten steel, and is limited to 1 to 2% in consideration of the effect on the flowability of molten slag.

Al2O3는 산성 산화물로 작용시 점도를 증가시키는 등 용강 슬래그의 점도에 영향을 미치므로 10∼15%가 적당하다.Since Al 2 O 3 affects the viscosity of molten steel slag, such as increasing the viscosity when acting as an acidic oxide, 10 to 15% is suitable.

유리(Free) 탄소(C)는 용강중으로의 흡수를 고려하여 용강의 성분 조성에 영향을 미치지 않도록 10∼14% 정도 함유한다.Free carbon (C) is contained in an amount of about 10 to 14% so as not to affect the composition of molten steel in consideration of absorption into molten steel.

흑연은 함유량이 8.5 중량% 이상인 경우 부피 팽창에 의한 보온성이나 재산화 방지 효과는 향상되나 용강중으로 탄소(C)가 흡수되어 도 2 도시와 같이 목표 용강 성분을 초과할 수 있다.When the graphite content is more than 8.5% by weight, the thermal insulation or reoxidation prevention effect due to volume expansion is improved, but carbon (C) may be absorbed into the molten steel to exceed the target molten steel component as shown in FIG. 2.

이를 구체적으로 살펴보면, 고급강인 극저탄소강의 경우 강중 목표 [C] 함량이 0.002∼0.007 중량% 일 때, 보온재내의 유리 탄소(Free carbon)가 첨가 흑연에 의해 약 1560∼1600℃의 용강과 접촉하여 용이하게 용강에 재혼입되므로 그 양을 적절하게 조정하여야 한다.Specifically, in the case of ultra-low carbon steel, which is a high grade steel, when the target [C] content in the steel is 0.002 to 0.007% by weight, free carbon in the insulation is easily contacted with molten steel at about 1560 to 1600 ° C by the addition graphite. The amount of remixing into the molten steel should be adjusted accordingly.

시험 결과, 흑연 첨가량이 8.5 중량% 이상인 경우 용강중 탄소 성분이 0.002% 이상 증가되어 목표 범위를 벗어났으며, 흑연 첨가량이 2 중량% 미만인 경우는 용강 보온능의 향상이 종래의 경우와 비교하여 거의 없으며 재산화 방지 효과도 거의 없었으므로, 본 발명에서 흑연 함유량은 2∼8.5 중량%로 한다.As a result of the test, when the amount of graphite added is more than 8.5% by weight, the carbon component in the molten steel is increased by 0.002% or more, which is outside the target range. When the amount of graphite added is less than 2% by weight, the improvement of molten steel insulation ability is almost as compared with the conventional case. Since there was little reoxidation prevention effect, in this invention, graphite content shall be 2 to 8.5 weight%.

이러한 성분들은 화력 발전소의 폐기물인 연소재, 규조토, 분쇄왕겨 또는 흑연을 소스(Source)로 하여 투입된다.These components are sourced from sources such as combustibles, diatomaceous earth, ground chaff, or graphite, which are wastes from thermal power plants.

일반적으로, 용강 청정도의 평가 방법은 용강중의 산화물양을 나타내는 총산소량(T.[O])으로 평가하는데, 총산소량 함량이 낮다는 것은 보온재에 의한 재산화 방지 효과가 우수하다는 것을 나타낸다.In general, the method for evaluating the cleanliness of molten steel is evaluated by the total oxygen amount (T. [O]) indicating the amount of oxides in the molten steel, and the low total oxygen content indicates that the reoxidation effect by the insulation is excellent.

이하에서는 실시예와 관련하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

종래 사용하던 보온재와 본 발명에 따른 보온재의 효과를 동일한 조건하에서 실험하기 위해 턴디쉬 중앙에 댐(dam)을 만들어 양쪽으로 용강이 분배되도록 하고, 용강 상부면에 종래 보온재와 발명 보온재를 구분 투입하였다.In order to test the effects of the thermal insulation material and the thermal insulation material according to the present invention under the same conditions, a dam was formed in the center of the tundish to distribute the molten steel to both sides, and the conventional thermal insulation material and the invention thermal insulation material were separately added to the upper surface of the molten steel. .

발명재와 종래재의 성분은 표 1 과 같다.The components of the invention and the prior art are shown in Table 1.

구분시험재Classification Test 성 분 (중량%)Ingredients (% by weight) SiO2 SiO 2 CaOCaO MgOMgO Al2O3 Al 2 O 3 Fe2O3 Fe 2 O 3 유리탄소Free carbon 흑 연Graphite 기타Etc 종래재Conventional 58.3358.33 9.759.75 1.241.24 6.246.24 1.441.44 14.2514.25 없음none 잔여량Residual amount 발명재1Invention 1 63.4463.44 1.021.02 0.900.90 13.7913.79 1.341.34 12.5412.54 3.03.0 "" 발명재2Invention 2 64.5664.56 1.231.23 0.950.95 14.2514.25 1.451.45 10.4510.45 4.04.0 "" 발명재3Invention 3 61.5561.55 1.851.85 0.850.85 11.3511.35 1.241.24 13.5513.55 5.05.0 "" 비교재1Comparative Material 1 60.3560.35 1.751.75 1.351.35 11.4511.45 1.051.05 14.5514.55 1.51.5 "" 비교재2Comparative Material 2 57.5057.50 2.352.35 1.851.85 15.6015.60 0.950.95 9.459.45 9.09.0 ""

실험을 실시하여 그 결과로서의 용강중의 총산소량(T.[O])을 평가한 바, 도 3 도시와 같이 본 발명재의 경우는 종래재의 경우 보다 총산소량이 낮아 청정도가 향상되었음을 알 수 있었으며, 이는 재산화를 방지할 수 있는 성질이 향상됨을 의미하며, 도 4 도시와 같이, 용강의 보온성도 향상되었다. 비교재의 경우는 흑연 함량이 과도하게 많거나 적음으로써 용강 중으로의 탄소 흡수량이 과도하여 용강 성분의 변화를 발생하고 재산화 방지 효과 및 보온 효과가 미미하여 본 발명 실시에 부적합하였다.As a result, the total oxygen amount (T. [O]) in the molten steel was evaluated, and as shown in FIG. 3, the present invention material showed a lower total oxygen amount than the conventional material, resulting in improved cleanliness. It means that the property that can prevent reoxidation is improved, as shown in Figure 4, the thermal insulation of molten steel is also improved. In the case of the comparative material, excessively high or low graphite content, excessive carbon absorption into the molten steel caused a change in the molten steel component, and it was not suitable for the practice of the present invention because the reoxidation prevention effect and the thermal insulation effect were insignificant.

한편, 턴디쉬에 투입하는 보온재 투입량을 비교한 바, 종래 일회의 연연주 작업시 200∼250㎏을 투입하였으나, 본 발명재의 경우는 150∼200㎏ 투입하면 종래 보다 더욱 우수한 효과를 발생하였다. 이는 보온재에 함유된 흑연의 부피 팽창에 의해 용강이 대기로부터 양호하게 차단되기 때문이다.On the other hand, when the amount of thermal insulation material to be put into the tundish was compared, 200-250 kg was added during the previous one-time performance, but in the case of the present invention, when 150-200 kg was added, the effect was more excellent than before. This is because molten steel is well blocked from the atmosphere by the volume expansion of graphite contained in the heat insulating material.

따라서, 상기 설명한 바와 같은 본 발명의 흑연 함유 턴디쉬 용강 보온재에 의하면, 보온재 투입량을 감소시킬 수 있어서 원가 절감 효과가 얻어지며, 턴디쉬 내에 수용된 용강의 청정도를 향상시키고 용강 보온성을 향상시키는 등 유용한 효과가 얻어진다.Therefore, according to the graphite-containing tundish molten steel thermal insulation material of the present invention as described above, it is possible to reduce the amount of the thermal insulation material input cost reduction effect, to improve the cleanliness of the molten steel accommodated in the tundish and to improve the molten steel insulation Is obtained.

Claims (1)

용강의 재산화를 방지하고 보온성을 향상시키기 위해 턴디쉬내 용강에 투입되는 용강 보온재로서, 중량%로, SiO2: 60∼65%, CaO: 1∼2%, Al2O3: 10∼15%, 유리(Free) 탄소(C): 10∼14%, 흑연: 2∼8.5%, 기타 불순물로 이루어지는 것을 특징으로 하는 흑연 함유 턴디쉬 용강 보온재.Molten steel thermal insulation material which is added to molten steel in tundish to prevent reoxidation of molten steel and to improve heat retention, in weight%, SiO 2 : 60 to 65%, CaO: 1 to 2%, Al 2 O 3 : 10 to 15 %, Free carbon (C): 10 to 14%, graphite: 2 to 8.5%, graphite-containing tundish molten steel heat insulating material, characterized in that consisting of other impurities.
KR1019980044605A 1998-10-23 1998-10-23 Tundish flux containing graphite KR20000026874A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040040844A (en) * 2002-11-08 2004-05-13 주식회사 포스코 Method for charging slag forming reduction type heat insulation material in receive ladle
KR100562638B1 (en) * 2001-12-12 2006-03-20 주식회사 포스코 Insulating materials for molten steel in ladle
KR101257253B1 (en) * 2010-10-28 2013-04-23 현대제철 주식회사 Insulator for molten steel and steel manufactured by using the same
KR20230160068A (en) 2022-05-16 2023-11-23 주식회사 포스코 Heat insulating material and casting method using the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5061327A (en) * 1973-10-02 1975-05-26
JPS54122634A (en) * 1978-03-16 1979-09-22 Kamogawa Kougiyou Kk Additive for continuous steel casting
KR960000368A (en) * 1994-06-29 1996-01-25 오철웅 Expandable Granular Insulating Agent and Manufacturing Method Thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5061327A (en) * 1973-10-02 1975-05-26
JPS54122634A (en) * 1978-03-16 1979-09-22 Kamogawa Kougiyou Kk Additive for continuous steel casting
KR960000368A (en) * 1994-06-29 1996-01-25 오철웅 Expandable Granular Insulating Agent and Manufacturing Method Thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100562638B1 (en) * 2001-12-12 2006-03-20 주식회사 포스코 Insulating materials for molten steel in ladle
KR20040040844A (en) * 2002-11-08 2004-05-13 주식회사 포스코 Method for charging slag forming reduction type heat insulation material in receive ladle
KR101257253B1 (en) * 2010-10-28 2013-04-23 현대제철 주식회사 Insulator for molten steel and steel manufactured by using the same
KR20230160068A (en) 2022-05-16 2023-11-23 주식회사 포스코 Heat insulating material and casting method using the same

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