KR20040040844A - Method for charging slag forming reduction type heat insulation material in receive ladle - Google Patents

Method for charging slag forming reduction type heat insulation material in receive ladle Download PDF

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KR20040040844A
KR20040040844A KR1020020069162A KR20020069162A KR20040040844A KR 20040040844 A KR20040040844 A KR 20040040844A KR 1020020069162 A KR1020020069162 A KR 1020020069162A KR 20020069162 A KR20020069162 A KR 20020069162A KR 20040040844 A KR20040040844 A KR 20040040844A
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South Korea
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molten steel
insulation material
ladle
slag
heat insulation
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KR1020020069162A
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Korean (ko)
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이창현
김해원
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주식회사 포스코
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Priority to KR1020020069162A priority Critical patent/KR20040040844A/en
Publication of KR20040040844A publication Critical patent/KR20040040844A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle

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

Abstract

PURPOSE: A method for charging slag forming reduction type heat insulation material into ladle is provided to suppress slag forming that is an overflow caused by boiling generated as the heat reserving material is being chemically reacted with slag floated on an upper part of molten steel contained in teeming ladle. CONSTITUTION: The method comprises a step of preparing a heat insulation material(5) having a composition comprising 30 to 50 wt.% of silicon dioxide, 20 to 30 wt.% of alumina and less than 3 wt.% of total carbon; and a step of injecting the prepared heat insulation material into slag(6) floated on an upper part of molten steel from the directly above molten steel contained in the teeming ladle(4) in an injection quantity corresponding to a ratio of 0.10 to 2.0 kg of the heat insulation material per kg of slag, wherein the injection quantity of the heat insulation material is 200 to 300 kg in a teeming ladle having inner diameter of 4 m or less and containing 300 tons or less of molten steel.

Description

수강래들 슬래그 포밍 저감형 보온재 투입방법{METHOD FOR CHARGING SLAG FORMING REDUCTION TYPE HEAT INSULATION MATERIAL IN RECEIVE LADLE}METHOD FOR CHARGING SLAG FORMING REDUCTION TYPE HEAT INSULATION MATERIAL IN RECEIVE LADLE}

본 발명은 제강 노외 정련공정에서 수강래들 안에 담겨져 있는 용강의 온도가 하락되는 것을 방지하기 위한 보온재 투입방법에 관한 것으로, 특히 수강래들내 용강 상부에 부상되어 있는 슬래그와 보온재가 화학반응되면서 끓어 넘치는 현상인 슬래그 포밍을 최대로 억제시킬 수 있도록 한 수강래들 슬래그 포밍 저감형 보온재투입방법에 관한 것이다.The present invention relates to a method of adding a thermal insulation material to prevent the temperature of the molten steel contained in the steel ladle in the refining process outside the steelmaking furnace, in particular, the slag and the thermal insulation material floating on the molten steel in the steel ladle boils while chemically reacted The present invention relates to a slag-forming slag forming reduction thermal insulation material input method capable of maximally suppressing slag forming, which is overflowing phenomenon.

일반적으로, 도 1의 도시와 같이, 전로작업은 제강공정중 전로(1)에서 연속 주조공정에 이르기까지 주조에 필요한 용강(3)의 온도값을 유지시켜야 하는 특성이 있다.In general, as shown in FIG. 1, the converter has a characteristic of maintaining the temperature value of the molten steel 3 necessary for casting from the converter 1 to the continuous casting process during the steelmaking process.

왜냐하면, 주조되는 용강(3)의 온도가 적정해야만 용강의 품질이 좋고, 주조 작업이 원활하기 때문이다.This is because the quality of the molten steel is good only when the temperature of the molten steel 3 to be cast is appropriate, and the casting operation is smooth.

이에 반해, 용강(3)의 온도가 낮으면 전로(1)의 후공정인 버블링공정과 탈가스공정에서 용강성분과 게재물 분리부상에 따른 정련작업을 하기에 앞서 온도를 억지로 올려 주기 위한 별도의 승온작업을 해야 하는 문제점이 야기 된다.On the other hand, if the temperature of the molten steel 3 is low, a separate process for forcibly raising the temperature before performing the refining operation according to the separation of molten steel components and inclusions in the bubbling process and the degassing process, which is a post process of the converter 1, is performed. Problem of raising the temperature is caused.

즉, 전로(1)에서 일정한 온도값으로 맞춰서 수강래들(4)로 옮겨진 용강(3)의 온도를 드롭(drop)시키지 않고 잘 보온시키는 일련의 작업이 용강(3)의 품질과 후속 작업의 능률을 좌우하는 척도가 된다.That is, a series of operations for keeping the temperature of the molten steel 3 transferred to the grading ladle 4 at a constant temperature value in the converter 1 without dropping the quality of the molten steel 3 and the subsequent work are performed. It is a measure of efficiency.

다시 말하자면, 용강(3)이 전로(1)에서 출강되는 과정중 혹은 수강래들(4)로 출강된 후 이동되는 과정중에 대기와의 접촉이 유발되고 이러한 대기접촉은 용강(3)의 온도를 급속히 떨어뜨리게 되므로 종래에는 이를 방지하기 위해 대기와의 접촉을 차단할 수 있는 보온재를 투입하여 왔다.In other words, the molten steel 3 is brought into contact with the atmosphere while the molten steel 3 is pulled out of the converter 1 or is moved to and pulled out of the water ladle 4 and this atmospheric contact causes the temperature of the molten steel 3 to rise. In order to prevent this from falling rapidly in the past has been added to the insulation to block the contact with the atmosphere.

종래 보온재는 주로 이산화규소 50%이하, 알루미나 40%이하를 주성분으로 하고 토탈카본의 양과는 무관하게 투입되었으며, 투입방법에 있어서도 일정한 기준없이 무작위 투입이 이루어져 왔다.Conventional insulation is mainly made of silicon dioxide 50% or less, alumina 40% or less as the main ingredient and irrespective of the amount of total carbon, even in the input method has been randomly added without a certain standard.

그런데, 도 2 및 도 3에서와 같이, 투입되는 보온재(5)와 수강래들(4)의 용융물내 산소가 반응하여 슬래그 포밍현상이 발생되고, 결국에는 넘치는 슬래그(6)로 인해 대차 이동용 레일(2)이 응고됨으로써 대차운행의 지장을 초래하고, 또 투입된 보온재(5)가 끓어 넘침으로써 보온재 투입량 대비 보온효율이 저조하여 용강의 보온성이 극히 열악하였다.However, as shown in FIGS. 2 and 3, the slag forming phenomenon is generated by the reaction of oxygen in the melt of the thermally insulating material 5 and the water-receiving ladle 4, and eventually, the slag 6 overflows due to the overflowing slag 6. As (2) solidified, it hindered the operation of the vehicle, and the added thermal insulation material (5) boiled over, resulting in low thermal insulation efficiency compared to the thermal insulation material input, resulting in extremely poor insulation of molten steel.

결국, 온도관리 불량으로 인한 용강의 품위가 급격히 하락하게 되었으며, 뿐만 아니라 종래 보온재는 포밍이 한번 발생되게 되면 7~10mm에 달하고 포밍 높이가 잔잔하게 안정범위로 진정되기까지는 13분~16분 정도가 소요되어 물류흐름이 원활해야 하는 일관 공정에서 용강을 처리하기 위한 작업 처리시간이 길어짐으로써 생산성을 급속히 떨어뜨리는 원인이 되었다.As a result, the quality of the molten steel dropped sharply due to poor temperature control, as well as the conventional thermal insulation materials reached 7 ~ 10mm once foaming occurs once, and it takes about 13 to 16 minutes until the forming height calms down to a stable range. The long processing time for treating molten steel in a consistent process, which requires a smooth logistics flow, caused a rapid drop in productivity.

참고로, 도 4 내지 도 7은 종래 여러종류의 보온재를 사용함에 있서 발생되는 포밍(기포)의 높이, 즉 포밍의 높이를 엑스레이 촬영하여 나타낸 사진들이며, 이 사진들에 나타난 바와 같이, 포밍의 높이가 높고, 투입후 일정시간이 경과되어도 포밍의 높이가 쉽게 줄어들지 않는 현상이 일어나고 있음을 확인할 수 있다.For reference, FIGS. 4 to 7 are pictures showing x-rays of the height of foaming (bubble), that is, the height of the foaming generated by using various kinds of thermal insulation materials. As shown in these photographs, the height of the foaming is shown. Is high, even if a certain time after the input of the foaming height is not easily reduced can be seen that the phenomenon occurs.

본 발명은 상기와 같은 문제점을 일소하기 위해서 창출된 것으로, 수강래들내 용융물의 온도를 보온하기 위해서 투입되는 보온재의 경우 투입된 보온재가 끓어 넘치는 포밍현상이 극소화되는 성분으로 이루어진 보온재와 이러한 성분으로 이루어진 보온재를 수강래들의 용융물 상부에 적정량 투입되게 하는 방법을 제공함에 그 목적이 있다.The present invention was created in order to eliminate the above problems, in the case of the thermal insulation material is added to keep the temperature of the melt in the river ladle is made of a thermal insulation material consisting of a component that minimizes the foaming phenomenon that the injected thermal insulation material boils It is an object of the present invention to provide a method for allowing a proper amount of the insulating material to be injected into the upper portion of the molten ladle.

아울러, 이러한 보온재 투입방법에 의해 수강래들내 용융물에 투입되는 보온재의 투입효율을 높이고, 보온효과도 함께 높여 온도 드롭으로 인한 용강 품질 열화요인을 사전에 제거하며, 보온재 투입으로 인해 발생되는 포밍현상 때문에 대차 이동에 장애를 주는 사태와 인근 부대 설비를 화실시키는 불안전한 작업성을 사전에 제거하여 안정적인 작업기반 구축에 일조할 수 있다.In addition, by the method of injecting the thermal insulation material, the efficiency of the thermal insulation material injected into the melt in the steel ladle is increased, and the thermal insulation effect is also increased to remove the quality deterioration factors due to temperature drop in advance, and the foaming phenomenon caused by the thermal insulation material input. Therefore, it can help to build a stable work base by eliminating the troubles that impede the movement of trucks and the unsafe workability that causes fire of nearby units in advance.

도 1은 일반적인 전로의 작업상황 개략도,1 is a schematic diagram of a working situation of a general converter,

도 2 및 도 3은 전로 작업시 종래 보온재를 투입하는 과정 및 그 결과를 보인 예시도,2 and 3 is an exemplary view showing a process and a result of the input of the conventional thermal insulation material during the converter operation,

도 4 내지 도 7은 종래 보온재 투입시 전로내부의 시간대별 포밍발생 과정을 촬영하여 보인 사진.4 to 7 are photographs taken by the process of forming the foaming by time zone inside the converter when the conventional thermal insulation material is added.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1....전로 3....용강1 .... converter 3 .... molten steel

4....수강래들 5....보온재4 .... water ladle 5 .... insulating material

본 발명의 상기한 목적은, 수강래들내 용강의 슬래그 포밍을 억제할 수 있는 보온재 투입방법에 있어서, 이산화규소가 30~50%이고, 알루미나가 20~30%이며, 토탈카본이 3% 미만인 성분조성을 갖는 보온재를 준비하는 단계와; 준비된 상기 보온재를 수강래들내 용강의 직상방에서 용강 상부에 부상된 슬래그 1킬로그램당 0.10~2.0kg의 비율에 해당하는 투입량으로 투입하는 단계를 포함하여 구성되는 것을 특징으로 하는 수강래들 슬래그 포밍 저감형 보온재 투입방법을 제공함에 의해 달성된다.The above object of the present invention is a method of insulating the slag forming of molten steel in the steel ladle, the silicon dioxide is 30-50%, the alumina is 20-30%, the total carbon is less than 3% Preparing a heat insulating material having a composition of ingredients; A water ladle slag forming method comprising the step of injecting the prepared heat insulating material in a dose corresponding to a ratio of 0.10 to 2.0 kg per kilogram of slag injured on the molten steel in the upper portion of the molten steel in the steel ladle It is achieved by providing a method of introducing a reduced thermal insulation material.

이하에서는, 본 발명의 한 바람직한 실시예에 대하여 보다 상세하게 설명하기로 한다.Hereinafter, one preferred embodiment of the present invention will be described in more detail.

본 발명에 따른 보온재의 주요 성분구성은 하기한 실시예내 표 1의 발명재와 같으며, 이산화규소가 30~50%이고, 알루미나가 20~30%이며, 토탈카본이 3% 미만을 이루도록 조성된다.The main composition of the thermal insulation according to the present invention is the same as the invention material of Table 1 in the following examples, silicon dioxide is 30 to 50%, alumina is 20 to 30%, and total carbon is formed to make less than 3%. .

또한, 본 발명에 따른 보온재의 투입량은 통상 내경이 4미터 이하이고 담겨지는 용강의 중량이 300톤 이하의 용량을 가진 수강래들임을 감안할 때 200~300kg 이 바람직하며, 이는 슬래그 1 킬로그램당 0.10~2.0kg을 투입하는 것을 의미한다.In addition, the input amount of the insulation according to the present invention is usually 200 ~ 300kg is preferred considering that the inner diameter is 4 meters or less and the weight of the molten steel is less than 300 tons, which is 0.10 ~ per kilogram of slag It means to put 2.0kg.

본 발명에 따른 수치한정에 있어 제일 중요한 성분값은 토탈카본의 첨가량이며 이는 토탈카본량이 3% 미만일 때에만 포밍 발생이 되지 않음을 실험을 통해 확인하였기 때문이다.The most important component value in the numerical limitation according to the present invention is the amount of total carbon added, because it was confirmed through experiments that foaming does not occur only when the total carbon amount is less than 3%.

또한, 수강래들에 투입되는 보온재의 투입량을 200~300kg으로 한정하는 이유는 200kg 미만이면 보온효과가 없고, 300kg 이상시에는 보온재의 투입량이 과다하게 많아 보온재 사용 원가상의 문제가 초래되기 때문이다.In addition, the reason for limiting the input amount of the insulating material to the ladle is 200 ~ 300kg is less than 200kg because there is no thermal effect, when the amount of the thermal insulation material is too much when the weight of more than 300kg causes a problem in the cost of using the insulating material.

이하,본 발명의 실시예와 관련하여 설명한다.It will be described below in connection with the embodiment of the present invention.

[실시예]EXAMPLE

본 발명에 따른 보온재의 우수성을 확인하기 위해 실제 전로의 크기를 일정비율로 축소시킨 도가니로에서 실조업과 동일조건으로 실험을 실시하여 슬래그포밍의 거동을 관찰하였다.In order to confirm the superiority of the thermal insulation material according to the present invention, the experiment was carried out under the same conditions as the actual operation in the crucible furnace in which the size of the actual converter was reduced to a certain ratio to observe the behavior of slag forming.

실험에 따른 보온재는 본 발명 성분원소의 범위내에서 약간씩 차등을 두었으며, 토탈카본의 첨가량의 경우에는 3% 내외의 값을 적용하여 실험하였고 이를 발명재, 비교재1,2로 구분하여 표 1에 나타내었다.The thermal insulation material according to the experiment was slightly different within the range of the components of the present invention, and in the case of the total carbon added amount was tested by applying a value of about 3% and divided into the invention material, comparative material 1, 2 table 1 is shown.

구분division 발명재Invention 비교재1Comparative Material 1 비교재2Comparative Material 2 성분조성Composition SiO2: 36%Al2O3: 26.4%Fe2O3: 3.8%토탈카본: 2.52%입도(2~10mm)SiO 2 : 36% Al 2 O 3 : 26.4% Fe 2 O 3 : 3.8% Total carbon: 2.52% Particle size (2 ~ 10mm) SiO2: 35%Al2O3: 28%Fe2O3: 3.87%토탈카본: 6.14%입도(2~10mm)SiO 2 : 35% Al 2 O 3 : 28% Fe 2 O 3 : 3.87% Total carbon: 6.14% Particle size (2 ~ 10mm) SiO2: 32.9%Al2O3: 23.2%Fe2O3: 3.9%토탈카본: 10.4%입도(2~10mm)SiO 2 : 32.9% Al 2 O 3 : 23.2% Fe 2 O 3 : 3.9% Total carbon: 10.4% Particle size (2 ~ 10mm) 포밍거동관찰Forming behavior observation 포밍 미발생No foaming 2분,21분후 포밍발생(14.5mm)Foaming occurs after 2 and 21 minutes (14.5mm) 1차: 5분, 42분(13.6mm)2차: 9분, 13분(32.1mm)포밍발생1st: 5 minutes, 42 minutes (13.6mm) 2nd: 9 minutes, 13 minutes (32.1mm) forming

본 발명에서 언급하는 보온재(발명재, 비교재1,2)에 따른 슬래그 포밍 거동을 관찰하기 위해 래들 슬래그 40그램을 알루미나 도가니에 넣고, 섭씨 1600도에서 용해, 입도의 영향을 배제하기 위해 3~5mm의 발명재, 비교재1,2 6g을 공히 용융 슬래그 상부에 투입했다.In order to observe the slag forming behavior according to the heat insulating material (invention material, comparative material 1,2) mentioned in the present invention, 40 grams of ladle slag is placed in an alumina crucible, and dissolved at 3,600 degrees Celsius to remove the effect of particle size. 6 g of the invention material and the comparative material 1,2 of 5 mm were all added to the upper part of the molten slag.

상기 각 보온재 6g의 투입량은 실제적으로 본 발명에서 언급하는 수강래들의 용량과 수강래들의 용강 상부에 부상되어 있는 슬래그의 중량을 고려한 투입야이며, 실 조업에서 적용되는 슬래그 총량 2,000킬로그램의 적정 중량(표면에 보온의 효과를 줄 정도의 두께를 형성해 주는 투입량)인 300 킬로그램을 투입하는 것과 동일한 효과를 나타냄을 분명한 사실이다.The amount of each 6g of the thermal insulation material is an input field considering the capacity of the steel slabs mentioned in the present invention and the weight of the slag floating on the molten steel of the steel slabs, and the appropriate weight of the total slag 2,000 kg applied in the actual operation ( It is obvious that it is equivalent to adding 300 kilograms, which is an input amount that forms a thickness sufficient to insulate the surface.

시험조건은 상술하였듯이, 현장 작업조건과 동일한 조건으로 축소한 조건이었다.As described above, the test conditions were reduced to the same conditions as the field working conditions.

시험결과, 비교재1,2는 포밍을 진정을 해도 계속해서 그 발생정도가 굉장히심하다는 것을 알 수 있었고, 발명재는 포밍 발생정도가 상대적으로 적거나 거의 일어나지 않음을 확인하였다.As a result of the test, Comparative materials 1 and 2 showed that the occurrence degree was very severe even after calming down the foaming, and the invention material confirmed that the occurrence degree of foaming was relatively low or rarely occurred.

발명재의 경우 투입 초기 아주 짧은 시간에 걸쳐 미세한 포밍현상이 관찰되었으나 수초후 이내 포밍이 진정되면서 급속한 안정화를 취하였다. 이는 발명재 투입시 발생되었던 가스가 신속히 배출됨으로써 포밍이 급속히 안정화되는 것으로 추정되었다.In the case of the invention, a fine foaming phenomenon was observed over a very short time at the beginning, but after a few seconds, the foaming calmed down and rapid stabilization was performed. It is estimated that the foaming is stabilized rapidly by rapidly discharging the gas generated when the invention is added.

결과적으로, 발명재는 비교재1,2에 비해 거의 포밍 발생이 없었으며, 이들 비교재1,2는 발명재에 비해 고정탄소 및 토탈탄소의 함량이 높아 상대적으로 포밍 발생 및 포밍 지속현상이 두드러진 것으로 추론할 수 있었다.As a result, the invention materials had almost no foaming compared to the comparative materials 1 and 2, and these comparative materials 1 and 2 had a higher content of fixed carbon and total carbon than the invention materials, and thus the foaming and foaming continuity were remarkable. Inferred.

참고적으로, 본 발명에 따른 보온재의 투입시 수강래들 용융물 상부에 국부적으로 뭉치지 않고 균일하게 산포시키는 것이 대단히 중요하며 투입량을 너무 적게 투입할시에는 보온효과가 없고, 투입량이 너무 많을시에는 원료 사용비의 문제로 인하여 그에 대한 제로섬이 발생될 우려가 있음을 감안함이 바람직하다.For reference, when the thermal insulation material is added, it is very important that the ladle is uniformly dispersed without melting the upper portion of the ladle, and there is no thermal effect when the input amount is too small, and the input material is too large. It is preferable to consider that there is a possibility of generating zero sum due to the problem of use cost.

이상에서 상세히 설명한 바와 같이, 본 발명에 따른 보온재 사용시 보온효율성이 높아 용강의 온도 드롭으로 인한 품질 열화가 방지되어 용강의 청정성을 높이는 효과는 물론 용강의 온도 불안정에 기인하여 제강 정련작업 전반에 걸친 물류흐름에 장애가 초래되는 문제점이 일소되어 용강의 생산성 향상에 이바지 하는 효과가 크다.As described in detail above, the use of the thermal insulation material according to the present invention has a high thermal insulation efficiency prevents quality deterioration due to temperature drop of molten steel, thereby enhancing the cleanliness of molten steel as well as logistics throughout steelmaking refining operations due to temperature instability of molten steel. The problem that causes an obstacle in the flow is eliminated, which contributes to the improvement of the productivity of molten steel.

뿐만 아니라, 보온재 투입작업시 포밍 발생이 없어져 설비고장 및 화재가 일소되어 작업의 안정성을 확보하는 실용상의 효과도 얻어지게 된다.In addition, there is no foaming occurs during the thermal insulation material input operation to eliminate the equipment failure and fire is also obtained a practical effect of ensuring the stability of the work.

Claims (2)

수강래들내 용강의 슬래그 포밍을 억제할 수 있는 보온재 투입방법에 있어서,In the method of insulating material that can suppress slag forming of molten steel in the steel ladle, 이산화규소가 30~50%이고, 알루미나가 20~30%이며, 토탈카본이 3% 미만인 성분조성을 갖는 보온재를 준비하는 단계와;Preparing a heat insulating material having a composition of 30 to 50% silicon dioxide, 20 to 30% alumina, and less than 3% total carbon; 준비된 상기 보온재를 수강래들내 용강의 직상방에서 용강 상부에 부상된 슬래그 1킬로그램당 0.10~2.0kg의 비율에 해당하는 투입량으로 투입하는 단계를 포함하여 구성되는 것을 특징으로 하는 수강래들 슬래그 포밍 저감형 보온재 투입방법.A water ladle slag forming method comprising the step of injecting the prepared heat insulating material in a dose corresponding to a ratio of 0.10 to 2.0 kg per kilogram of slag injured on the molten steel in the upper portion of the molten steel in the steel ladle Reduction type insulation materials. 제1항에 있어서,The method of claim 1, 상기 투입량은 내경 4미터 이하, 수강되는 용강의 중량 300톤 이하인 수강래들에서 200~300kg 인 것을 특징으로 하는 수강래들 슬래그 포밍 저감형 보온재 투입방법.Wherein the input diameter of less than 4 meters, steel ladle slag forming reduced thermal insulation material input method, characterized in that 200 ~ 300kg from the steel ladle of less than 300 tons of molten steel to be taken.
KR1020020069162A 2002-11-08 2002-11-08 Method for charging slag forming reduction type heat insulation material in receive ladle KR20040040844A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101105797B1 (en) * 2011-07-07 2012-01-17 주식회사 유니크시스템 Curtain wall for double insulating heat
CN113667791A (en) * 2021-08-23 2021-11-19 攀钢集团攀枝花钢钒有限公司 Heat preservation method for metallurgical converter

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JPS54122634A (en) * 1978-03-16 1979-09-22 Kamogawa Kougiyou Kk Additive for continuous steel casting
JPS61219462A (en) * 1985-03-27 1986-09-29 Nippon Kokan Kk <Nkk> Charging method for ladle insulating material
KR20000015192A (en) * 1998-08-27 2000-03-15 박대성 Surface heat insulating material of smelting furnace
KR20000026874A (en) * 1998-10-23 2000-05-15 이구택 Tundish flux containing graphite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54122634A (en) * 1978-03-16 1979-09-22 Kamogawa Kougiyou Kk Additive for continuous steel casting
JPS61219462A (en) * 1985-03-27 1986-09-29 Nippon Kokan Kk <Nkk> Charging method for ladle insulating material
KR20000015192A (en) * 1998-08-27 2000-03-15 박대성 Surface heat insulating material of smelting furnace
KR20000026874A (en) * 1998-10-23 2000-05-15 이구택 Tundish flux containing graphite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101105797B1 (en) * 2011-07-07 2012-01-17 주식회사 유니크시스템 Curtain wall for double insulating heat
CN113667791A (en) * 2021-08-23 2021-11-19 攀钢集团攀枝花钢钒有限公司 Heat preservation method for metallurgical converter

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