KR100798808B1 - Repairing material having refining effect - Google Patents
Repairing material having refining effect Download PDFInfo
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- KR100798808B1 KR100798808B1 KR1020060129019A KR20060129019A KR100798808B1 KR 100798808 B1 KR100798808 B1 KR 100798808B1 KR 1020060129019 A KR1020060129019 A KR 1020060129019A KR 20060129019 A KR20060129019 A KR 20060129019A KR 100798808 B1 KR100798808 B1 KR 100798808B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00551—Refractory coatings, e.g. for tamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D2001/0046—Means to facilitate repair or replacement or prevent quick wearing
Abstract
Description
본 발명은 제강 조업 중 발생되는 제강설비의 부분적 손상부위나, 연속주조기의 내부 보호를 위해 사용되는 도포재 및 보수재에 관한 것으로, 보다 상세하게는 내화물 골재를 정련골재로 일부 대체하여 청정도를 높여 고급강 생산에 유리한 보수재에 관한 것이다. The present invention relates to a coating material and a repair material used for the internal damage of the steelmaking equipment or a partial casting of the steelmaking equipment generated during the steelmaking industry, and more specifically, to replace the refractory aggregate with refined aggregates in part to increase the cleanliness The present invention relates to a repair material advantageous for steel production.
전로 등 각종 제강로는 조업중에 부분적으로 손상된 부위가 발생하면, 로의 수명연장을 위해서 손상부위를 보수하여 사용하고 있다. 손상부위의 보수 방법으로는 열간 보수, 냉간 보수가 있으며 도포방식은 스프레이방식, 투입방식 등이 있다.Various steelmaking furnaces such as converters are used to repair damaged parts in order to prolong the life of the furnace. There are hot repair and cold repair methods for repairing damaged parts, and the spraying method and injection method are applied.
최근, 강중 개재물과 산소량 등을 감소시킨 청정도가 높은 고급강의 수요가 증대됨에 따라 전로에서 청정도를 높이는 방법, AOD, VOD등의 단계로 청정도를 높이는 방법 등 다수의 방법이 사용 중에 있다. 그러나 이러한 방법은 제조공정 중 특정 단계에 한정되는 방법이고 제조공정 전체에서, 특히 턴디쉬 등에서는 청정도 개선방안이 거의 없는 실정이다.Recently, as the demand for high-quality steel with high cleanliness, which reduces the inclusions in the steel and the amount of oxygen, increases, a number of methods such as a method of increasing the cleanliness in the converter and a method of increasing the cleanliness in steps such as AOD and VOD are being used. However, such a method is limited to a specific step in the manufacturing process, and there is almost no method for improving cleanliness in the manufacturing process as a whole, especially in tundish.
이와 같이, 강재의 청정도를 제조공정 전반에 걸쳐 특정 단계에 한정되지 않고 향상시킬 필요성이 부각되고 있으나, 그 대안은 제시되고 있지 않은 실정이다.As such, the necessity of improving the cleanliness of the steel is not limited to a specific step throughout the manufacturing process, but the alternative has not been proposed.
본 발명은 상기와 같은 단순 영구장 재질보호 측면에서 벗어나 제조공정 전반에 걸쳐,즉 특정 단계에 한정되지 않고 보수재를 이용하여 강 내부의 불순물 제거효과에 의해 청정도가 높은 고급강 생산에 유리한 보수재를 제공하는 것을 목적으로 한다.The present invention provides a repair material that is advantageous to the production of high-quality steel with high cleanliness by removing impurities in the steel by using the repair material, not limited to a specific stage, in the entire manufacturing process, that is, from the simple permanent field material protection aspect as described above. It aims to do it.
상기한 목적을 달성하기 위한 본 발명의 보수재는 중량%로, 정련골재 20~80%, 첨가제 4~12% 및 나머지는 염기성 내화골재로 이루어진다.The repair material of the present invention for achieving the above object is by weight%, refined aggregate 20 ~ 80%, additives 4 ~ 12% and the rest is made of basic refractory aggregate.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명의 보수재는 특정 제강공정에 한정하여 적용되지 않고 용강과의 접촉이 발생하는 모든 공정에 사용이 가능하며 예를 들어, 전로, 래들, RH, AOD, VOD, 턴디쉬 등 보수재가 사용되는 모든 단계에서 적용될 수 있다. The repairing material of the present invention is not limited to a specific steelmaking process and can be used in all processes in which contact with molten steel occurs. For example, all repairing materials such as converters, ladles, RH, AOD, VOD, and tundish are used. Can be applied at the stage.
염기성 내화골재에는 마그네시아 클링커, 마그네시아 크롬 클링커, 돌로마이트 클링커 등이 있으며, 이중 1 또는 2를 필요에 따라 선택하여 사용할 수 있다.Basic refractory aggregates include magnesia clinker, magnesia chromium clinker, dolomite clinker and the like, and one or two may be selected and used as necessary.
마그네시아 클링커는 마그네사이트 또는 수산화마그네슘 등을 1500℃ 이상 구워 만든 덩어리로 산화마그네슘을 주성분으로 하며 염기성 슬래그에 잘 견디는 특성이 있다. 마그네시아 클링커는 고온에서 소결한 소결 클링커와 전기 용융한 전융 클링커가 있으며 본 발명에서는 소결 클링커와 전융 클링커 모두 적용이 가능하다. 마그네시아 클링커는 필요에 따라서 일정량 마그네시아 크롬 클링커로 대체될 수 있다.Magnesia clinker is a lump made by baking magnesite or magnesium hydroxide at 1500 ℃ or higher and has magnesium oxide as a main component and has good resistance to basic slag. The magnesia clinker includes a sintered clinker sintered at a high temperature and an electrolytic molten clinker. In the present invention, both the sintered clinker and the molten clinker can be applied. The magnesia clinker can be replaced with an amount of magnesia chromium clinker as needed.
돌로마이트 클링커는 산화마그네슘 이외에 산화칼슘을 주성분으로 하며 슬래그에 대한 내침식성이 강하고 침투 억제 효과가 우수하다. 또한 빠른 소성능력에 의해 중온강도 유지에 효과적이다. 다만 소화성이 있어 수분과 반응시 잘 분화되는 경향이 있어 일정 성분 이상의 함량은 바람직하지 않다. 또한 산화칼슘을 성분으로 하나 산화마그네슘과 복합적인 조직을 형성하므로 반응성 및 활성도가 떨어져 돌로마이트 클링커 자체로는 정련효과가 다소 저하된다.Dolomite clinker is composed of calcium oxide as a main ingredient in addition to magnesium oxide, and has strong corrosion resistance against slag and excellent penetration inhibitory effect. In addition, it is effective for maintaining mesophilic strength by fast firing capacity. However, since it is extinguishable and tends to differentiate well when reacted with moisture, a content of more than a certain component is not preferable. In addition, since calcium oxide is used as a component to form a complex structure with magnesium oxide, the refining effect is slightly lowered by the dolomite clinker itself because of its reactivity and activity.
정련골재가 첨가됨에 따라 기공율이 증가되어 중온강도의 감소가 발생하게 되는 경우에는 마그네시아 클링커의 일정량을 돌로마이트 클링커로 대체하는 것이 바람직하다. 이와 같은 배합조정을 하는 경우 열간 강도를 유지하면서도 정련골재 의 적용함량을 높일 수 있는 장점이 있다. 이와 같이 돌로마이트 클링커를 첨가하는 경우에는 염기성 내화골재 중 5중량%미만으로 첨가될 경우 상기와 같은 효과를 거둘 수 없으며, 50중량%을 초과하여 첨가된 경우, 상기 언급한 소화성의 문제가 있는바, 염기성 내화골재의 5~50중량%로 첨가되는 것이 바람직하다. When the fine aggregate is added, when the porosity increases to decrease the mesophilic strength, it is preferable to replace a certain amount of magnesia clinker with dolomite clinker. When such a compounding adjustment has the advantage of increasing the application content of the refined aggregate while maintaining the hot strength. As such, when the dolomite clinker is added, when the addition of less than 5% by weight of the basic refractory aggregate can not achieve the same effect, when added in excess of 50% by weight, there is a problem of digestibility mentioned above, It is preferably added at 5 to 50% by weight of the basic refractory aggregate.
정련골재는 CaO 공급이 가능한 천연 및 인위적으로 합성한 석회류를 사용한다. 그 중 석회석을 주로 하고 소석회, 생석회 등으로부터 선택된 1 또는 2이상으로 이루어지며 주원료로 사용된다. 상기 정련골재는 승온기간 중 1000℃이상에서 열간 활성화된 반응성이 높은 상태인 미세한 산화칼슘 형태로 유지되어 용강과 접촉시 강 내부에 존재하고 있는 개재물과의 반응을 통해 저비중 화합물을 형성하여 이를 상부로 부상시키는 역할을 수행하며, 비연신성 개재물을 연신성 개재물화 시키는 역할을 수행한다. 이러한 역할을 수행하기 위해 정련골재는 20중량%이상 첨가되는 것이 바람직하나, 80중량%를 초과하는 경우 강도저하나 승온 중 부품(부스러짐)이 발생할 수 있는바, 20~80중량%로 첨가되는 것이 바람직하다.Refined aggregates use natural and artificially synthesized limes capable of CaO supply. Among them, limestone is mainly used, and it is composed of one or two or more selected from slaked lime, quicklime, etc., and is used as the main raw material. The refined aggregate is maintained in the form of fine calcium oxide, which is hotly activated at a temperature of 1000 ° C. or higher during a temperature increase period, thereby forming a low specific gravity compound through reaction with inclusions present in the steel when it is in contact with molten steel. It is used to float the non-stretchable inclusions, and to stretch the non-stretchable inclusions. In order to perform this role, the refined aggregate is preferably added in an amount of 20% by weight or more, but when it exceeds 80% by weight, the strength (parts) during the temperature increase may occur, and thus, 20 to 80% by weight is added. It is preferable.
마그네시아 클링커, 돌로마이트 클링커, 정련골재는 모두 스프레이 형태로 적용되는 것을 고려하여 입경이 5mm이하가 되는 것이 바람직하다.The magnesia clinker, the dolomite clinker, and the refined aggregates are all preferably in the form of a spray, preferably having a particle diameter of 5 mm or less.
첨가재는 열간 보수인지 냉간 보수인지에 따라 그에 적합한 통상의 첨가재를 사용하며, 예를 들어 SiO2를 주성분으로 하는 초미분, 수분감소 및 유동성 측면을 위한 인산계 바인더, 열간 강도를 주기 위한 분규계 바인더 등이 있다. 다만 스프레이 형태로 적용되는 것을 고려하여 수용성 분말형태인 것이 바람직하다. 첨가재가 4%미만으로 첨가되는 경우 시공시 접착 불량이 발생하고, 12%를 초과하는 경우 내용성이 저하되는 문제가 있는 바, 4~12%로 첨가되는 것이 바람직하다.Additives are conventional additives suitable for hot repair or cold repair. For example, ultrafine powder mainly composed of SiO 2 , phosphoric acid binder for moisture reduction and fluidity, and powder binder for imparting hot strength. Etc. However, in consideration of being applied in the form of a spray is preferably in the form of a water-soluble powder. If the additive is less than 4%, poor adhesion occurs during construction, and if it exceeds 12%, there is a problem of lowering the solvent content, it is preferred to add 4 to 12%.
이하 실시예를 통하여 본 발명을 상세히 설명하나, 이는 본 발명의 바람직한 실시예일뿐 본 발명의 범위가 이러한 실시예의 기재범위에 의하여 제한되는 것은 아니다.Hereinafter, the present invention will be described in detail with reference to the following examples, which are only preferred embodiments of the present invention, and the scope of the present invention is not limited by the description of these embodiments.
(실시예)(Example)
표 1에 사용한 원료의 주요 화학 성분은, 마그네시아 클링커가 산화마그네슘 90중량%, 기타 불순물이 10중량%이고, 돌로마이트 클링커는 산화칼슘 25중량%, 산화마그네슘 70중량%, 기타 불순물 5중량%이며 분화발생에 따른 품질편차 감소를 위하여 입경 0.3mm이상의 조립분으로 적용하였다. 정련골재는 석회석 95중량%로 가열에 의해 산화칼슘형태가 되면 50중량%이었으며, 연속 주조기용 습식 스프레이 도포재에 적용하였다. 이러한 정련골재는 용강과의 접촉시 용강 내부로 확산되기 때문에 재질의 내용성 저하와 마모 손상의 증가의 현상을 나타낼 수 있으나 이와 같은 경우 강에 의한 내용성을 유지하기 위해 1차로 염기성 보수재를 적용한 후 2차 로 정련용 염기성 보수재로 이중 시공하는 것이 바람직하다.The main chemical components of the raw materials used in Table 1 are magnesia clinker 90% by weight magnesium oxide and 10% by weight other impurities, dolomite clinker 25% by weight calcium oxide, 70% by weight magnesium oxide, 5% by weight other impurities and differentiation In order to reduce the quality deviation according to the occurrence, granules with a particle size of 0.3mm or more were applied. The refined aggregate was 95% by weight of limestone and 50% by weight of calcium oxide when heated, and was applied to a wet spray coating material for a continuous casting machine. Since the refined aggregate diffuses into the molten steel when it comes into contact with the molten steel, it may show a decrease in the contents of the material and an increase in wear damage. However, in this case, after the basic repairing material is first applied to maintain the steel Secondary construction is preferred as a double basic refining material.
표 1과 같이 발명예 1-4과 비교예 1-4를 배합하고 여기에 물을 첨가하여 혼련 후 이를 틀에 넣은 다음 300℃로 가열하여 시편을 제작하였으며, 110℃에서 24시간, 전기로에서 1000℃ 및 1500℃에서 3시간 유지한 다음 상온에서 압축강도를 측정하였다.Inventive Example 1-4 and Comparative Example 1-4 were blended as shown in Table 1, water was added thereto, kneaded and then placed in a mold, and then heated to 300 ° C. to prepare a specimen. After maintaining for 3 hours at ℃ and 1500 ℃ was measured the compressive strength at room temperature.
한편 적정 시공품질 및 승온상태를 평가하기 위하여 모델 턴디쉬에서 직접 시공하여 시험을 진행했으며, 건조 24시간 후 버너를 이용하여 1000℃로 승온시험을 실시하였다.On the other hand, in order to evaluate the proper construction quality and the elevated temperature, the test was carried out by constructing directly in the model tundish, and after 24 hours of drying, a test was performed at 1000 ° C. using a burner.
발명예 1-4의 경우 본 발명에 따른 실시예이고, 비교예 1, 2의 경우는 정련골재를 과다하게 첨가한 실시예이며, 비교예3의 경우 정련골재만 첨가된 경우이고, 비교예 4의 경우 마그네시아 클링커만 100%첨가된 경우이다. Inventive Example 1-4 is an example according to the present invention, Comparative Examples 1 and 2 are examples in which excessively refined aggregates are added, and in Comparative Example 3, only refined aggregates are added, and Comparative Example 4 In this case, only magnesia clinker is added 100%.
발명예 1-4의 경우 저온 및 고온 강도가 양호하며 승온 후 상온으로 온도를 낮출 경우 3시간 이상 유지할 수 있는 특성을 보이며, 승온상태도 양호하였다. 그러나 정련골재를 과도하게 첨가하고 돌로마이트 클링커를 첨가하지 않은 비교예 1, 2의 경우 승온 후 상온으로 냉각시 시편이 조기에 분화가 되거나 승온 중 부품이 생겨 물성 측정이 불가능하였으며 승온상태에서도 미소부품이 발생하거나 강도가 저하되는 등의 문제가 발생하였다. 비교예 3의 경우 승온중 부품이 생기며 승온상태에서는 다층부품이 생기는 문제가 발생하였다. 비교예 4의 경우 종래기술인 마그네시아 클링커만 투입한 경우로서 저, 고온에서 모두 양호한 압축강도를 나타내며 1000℃로 승온 후 상온으로 냉각한 경우에도 부품이 발생하지 않는 양호한 성질을 나타내었다. 다만 실시예 4의 경우는 정련골재가 첨가되지 않아 청정효과를 거둘 수 없다. In the case of Inventive Example 1-4, the low temperature and high temperature strength were good, and when the temperature was lowered to room temperature after the temperature was raised, the characteristics were maintained for 3 hours or more, and the temperature was also good. However, in the case of Comparative Examples 1 and 2 without excessive addition of refined aggregate and dolomite clinker, the specimen was prematurely differentiated when cooled to room temperature after the temperature was raised or parts were formed during the temperature increase, so that the measurement of physical properties was impossible. A problem such as the occurrence or the decrease in strength occurred. In the case of Comparative Example 3, a part is generated during the temperature increase, and a problem occurs in that the multilayer part is formed in the elevated temperature state. In the case of Comparative Example 4, only the magnesia clinker of the prior art was added, and exhibited good compressive strength at low and high temperatures, and even when cooled to room temperature after the temperature was raised to 1000 ° C., good properties were shown. However, in the case of Example 4 can not achieve a clean effect because no refined aggregate is added.
표 2는 본 발명에 따른 실시예의 정련 효과를 기존 도포재와 비교한 것이다. 내화물 골재에 정련골재를 부분 대체하여 실로에 적용한 결과 기존의 염기성 내화물에 비하여 강중 개재물이 감소되었으며 턴디쉬 및 몰드에 잔류되는 산소량도 감소됨을 확인하였고 후공정 품질을 비교시 불량율 발생율이 낮아지는 등 청정도가 높아져 고급강 생산에 유리한 것으로 나타났다.Table 2 compares the refining effect of the embodiment according to the present invention with conventional coating materials. As a result of partially replacing refined aggregates in refractory aggregates and applying them to silo, it was confirmed that the inclusions in the steel were reduced and the amount of oxygen remaining in the tundish and mold was reduced compared to the existing basic refractory materials. Has been shown to be favorable for the production of high grade steel.
상술한 바와 같이, 본 발명은 종래 보수재의 영구장 재질보호 효과에 추가적으로 정련골재를 첨가하여 어느 단계에서나 강 내부의 불순물 제거효과를 거둘 수 있어 청정도가 높은 고급강 생산에 유리한 보수재를 제공할 수 있는 유용한 효과가 있다.As described above, the present invention can achieve the effect of removing impurities in the steel at any stage by adding a refined aggregate in addition to the permanent field material protection effect of the conventional repair material can provide a repair material that is advantageous for the production of high-quality steel with high cleanliness. It has a useful effect.
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KR100941407B1 (en) * | 2007-12-28 | 2010-02-10 | 주식회사 포스코 | Repairing Materials Composition |
KR101127922B1 (en) | 2009-06-16 | 2012-03-21 | (주)포스코켐텍 | Repairing Materials for Tapping Hole of Converter |
KR101140867B1 (en) | 2009-09-08 | 2012-05-03 | (주)포스코켐텍 | Basic Repairing material for Turndish |
KR101196132B1 (en) | 2010-11-26 | 2012-10-30 | 주식회사 포스코 | Repairing Materials Composition |
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KR100941407B1 (en) * | 2007-12-28 | 2010-02-10 | 주식회사 포스코 | Repairing Materials Composition |
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KR101140867B1 (en) | 2009-09-08 | 2012-05-03 | (주)포스코켐텍 | Basic Repairing material for Turndish |
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