KR100723129B1 - Basic castables for tundish dam block - Google Patents
Basic castables for tundish dam block Download PDFInfo
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- KR100723129B1 KR100723129B1 KR1020010051237A KR20010051237A KR100723129B1 KR 100723129 B1 KR100723129 B1 KR 100723129B1 KR 1020010051237 A KR1020010051237 A KR 1020010051237A KR 20010051237 A KR20010051237 A KR 20010051237A KR 100723129 B1 KR100723129 B1 KR 100723129B1
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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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
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- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- 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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
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Abstract
본 발명은 턴디쉬 댐블록용 염기성 부정형 내화조성물에 관한 것으로, 그 목적은 마그네시아를 주원료로한 인산염결합 마그네시아질 댐록의 내화조성물에 CaO원을 함유한 패각을 재활용하여 용강중에 함유된 비금속 개재물인 알루미나(Al2O3)를 포집할 수 있어서 청정강 제조에 용이한 턴디쉬 댐의 조성물을 제공함에 있다.
The present invention relates to a basic amorphous refractory composition for tundish dam blocks, and an object thereof is an alumina which is a non-metallic inclusion contained in molten steel by recycling a shell containing CaO source in a refractory composition of a phosphate-bonded magnesia damlock composed mainly of magnesia. The present invention provides a composition of a tundish dam that can collect (Al 2 O 3 ) and is easy to manufacture clean steel.
상기 목적을 달성하기 위한 본 발명은, 패각분:20~30중량%, 알루미나시멘트:3~6중량%, 알루미나 분말:6~10중량%, 헥사메타인산소다:3~6중량%, 나머지 마그네시아 크링커로 조성되는 턴디쉬 댐블록용 내화조성물에 관한 것을 그 기술적요지로 한다.
The present invention for achieving the above object, shell content: 20-30% by weight, alumina cement: 3-6% by weight, alumina powder: 6-10% by weight, hexamethaphosphate: 3-6% by weight, the remaining magnesia The technical subject matter of the refractory composition for tundish dam block formed by a clinker is made.
턴디쉬 댐블록, 패각, 개재물, 용강, 청정성Tundish Damblocks, Shells, Inclusions, Molten Steel, Cleanliness
Description
본 발명은 턴디쉬 댐용 염기성 부정형 내화조성물에 관한 것으로, 보다 상세하게는 주성분이 CaCO3인 패각을 재활용하여 강의 청정성을 높일 수 있는 염기성 부정형 내화조성물에 관한 것이다.
The present invention relates to a basic amorphous refractory composition for tundish dams, and more particularly, to a basic amorphous refractory composition capable of increasing the cleanliness of steel by recycling shells whose main component is CaCO3.
일반적으로 턴디쉬의 댐은 전로나 전기로 등의 제강로에서 정련된 용강이 래들을 거쳐 턴디쉬에 주입될때 용강류의 난류를 억제시켜, 강에 대한 산화물의 혼합을 방지하거나 강중의 개재물을 부상분리 시키도록 하여 개재물을 물리적으로 감소시키는 역할을 하고 있다. 이 때문에 턴디쉬의 댐은 고알루미나질의 프리캐스트 블록 또는 내화벽돌이 사용되고 있다. 또 알루미나계의 개재물을 꺼리는 경우에는 지르콘질의 프리캐스트 블록 또는 마그네시아-카본질의 내화벽돌이 사용되고 있다. 어느 경우에도 댐의 역할은 물리적인 방법에 의해 강중 개재물의 감소에 이용된다.
Generally, tundish dams suppress turbulent flow of molten steel when molten steel refined in steelmaking furnaces such as converters or electric furnaces are injected into the tundish through ladles, thereby preventing the mixing of oxides in the steel or injuring the inclusions in the steel. It serves to physically reduce the inclusions by making them separate. For this reason, a high-alumina precast block or a firebrick is used for the tundish dam. In addition, when reluctant to alumina inclusions, zircon precast blocks or magnesia-carbon fire-resistant bricks are used. In either case, the dam's role is used to reduce the inclusions in the river by physical means.
종래의 턴디쉬 댐은 통상 Al2O3-SiO2계의 재질이기 때문에 용손에 의해 용강중으로 산소공급원이 되기 쉽고 또 용강중 개재물의 제거효과는 없었다. 이 때문에 청정도가 요구되는 강종에 따라 Al2O3-SiO2계 댐을 사용할때는 MgO질의 코팅재를 사용하고 있는 형편이다. 그러나, 이러한 코팅작업은 노력 및 시간이 걸릴 뿐 아니라 코팅재중의 수분이 댐 내부로 침투하고, 침투된 수분이 승온중에 수증기로 된다. 이러한 수증기가 온도 상승이 큰 경우는 급격히 체적팽창을 일으켜 댐이 파괴될 수도 있다.
Conventional tundish dams are usually made of Al 2 O 3 -SiO 2 -based materials, which are easy to supply oxygen to molten steel due to melting damage, and have no effect of removing inclusions in molten steel. For this reason, when Al 2 O 3 -SiO 2 dams are used depending on the steel grades requiring cleanliness, MgO-based coating materials are used. However, this coating operation not only takes effort and time, but also the moisture in the coating material penetrates into the dam, and the penetrated water vaporizes during the temperature increase. If the water vapor rises significantly, the volume may expand rapidly and the dam may be destroyed.
또 CaO질의 댐(일본 특허공개공보 소58-193306,63-207457)은 화학적으로 알루미나계 개재물을 제거하는데는 효과적이나 CaO가 대단히 소화(slaking) 되기 쉽기 때문에 보존중에 균열을 발생하거나,분화를 일으키기쉽다는 문제가 있어 실용화하기가 어렵다는 단점이 있다.
In addition, CaO dams (Japanese Patent Laid-Open No. 58-193306,63-207457) are effective in chemically removing alumina inclusions, but they are easily cracked or cause cracking during preservation because CaO is very easily slaked. There is a problem that it is easy to be difficult to put to practical use.
또한 마그네시아질 캐스타블은 개재물의 포집능은 다소 떨어지나 내식성이 뛰어나며, 알루미나 분말 또는 스피넬 크링커를 첨가하여 열간강도나 용적안정성을 개선하고 있다. 그러나, 마그네시아질 캐스타블을 혼련할 때 경화가 빨리 일어나 내화물이 굳어 버리는 급결현상이 발생하여 시공상의 문제점이 있다. 마그네시아질 캐스타블의 급결현상을 개선하기 위해 한국 공개특허공보 2000-46397호에서는 분산제로 헥사메타 인산소다와 경화지연제로 붕산을 첨가하여 급결현상을 억제하고 있다. 그러나, 여전히 개재물의 포집능이 떨어지는 단점이 있다.
In addition, the magnesia castable has a little lower capturing ability of inclusions but is excellent in corrosion resistance, and improves hot strength and volume stability by adding alumina powder or spinel clinker. However, when kneading the magnesia castable, there is a problem in construction due to the rapid hardening occurs and the refractory is hardened. In order to improve the rapid phenomena of magnesia-like castables, Korean Unexamined Patent Publication No. 2000-46397 suppresses rapid phenomena by adding hexameta phosphate as a dispersant and boric acid as a curing retardant. However, there is still a disadvantage in that the capturing ability of inclusions falls.
본 발명은 상술한 문제점을 개선하기 위한 것으로, 마그네시아를 주원료로한 인산염결합 마그네시아질 댐록의 내화조성물에 CaO원을 함유한 패각을 재활용하여 용강중에 함유된 비금속 개재물인 알루미나(Al2O3)를 포집할 수 있어서 청정강 제조에 용이한 턴디쉬 댐의 조성물을 제공하는데, 그 목적이 있다.
The present invention is to improve the above-described problems, by recycling the shell containing CaO source in the refractory composition of phosphate-bonded magnesia damlock mainly composed of magnesia to alumina (Al 2 O 3 ) which is a non-metallic inclusion contained in molten steel It is an object of the present invention to provide a composition of a tundish dam, which can be collected and is easy to produce clean steel.
상기 목적을 달성하기 위한 본 발명의 내화조성물은, 패각분:20~30중량%, 알루미나시멘트:3~6중량%, 알루미나 분말:6~10중량%, 헥사메타인산소다:3~6중량%, 나머지 마그네시아 크링커로 조성되는 것이다.
Refractory composition of the present invention for achieving the above object, shell content: 20-30% by weight, alumina cement: 3-6% by weight, alumina powder: 6-10% by weight, hexametaphosphate: 3-6% by weight And the remaining magnesia clinker.
이하, 본 발명을 상세히 설명한다. Hereinafter, the present invention will be described in detail.
본 발명은 CaCO3가 주성분인 패각을 분쇄한 분말을 턴디쉬 댐의 내화조성물로 재활용함으로써 CaO가 Al2O3개재물을 포집하여 제거하도록 함으로써 턴디쉬 댐블록이 강의 청정도를 높일 수 있도록 하는데, 특징이 있다.
The present invention is to improve the tundish dam block lecture purity by having removed CaO is collecting the Al 2 O 3 inclusions, by recycling in the refractory composition of the tundish dam the powder by the CaCO 3 grinding the main component of the shell, characterized There is this.
[마그네시아 크링커] [Magnesia Clinker]
본 발명에서 사용하는 마그네시아 크링커는 댐블록의 내화도와 하중연화온도를 높게 유지하기 위해 마그네시아(MgO)의 함량이 높은 것을 사용함이 바람직하다. 마그네시아 크링커는 다른 첨가원소의 합이 100중량%가 되도록 하는 양으로 배합되는데 바람직하게는 50중량%이상 함유되도록 하는 것이 좋다. 용강이나 스래그에 대하여 고내식성을 얻고, 용강중 개재물 억제 차원에서도 다량의 마그네시아 크링커 입자를 함유하는 것이 바람직하기 때문이다.
The magnesia clinker used in the present invention preferably uses a high content of magnesia (MgO) in order to maintain a high fire resistance and load softening temperature of the dam block. The magnesia clinker is formulated in an amount such that the sum of the other additive elements is 100% by weight, preferably 50% by weight or more. It is because it is preferable to obtain high corrosion resistance with respect to molten steel and slag, and to contain a large amount of magnesia clinker particle also in the viewpoint of suppressing inclusions in molten steel.
[패각분][Shell shell]
본 발명에서는 패각 분쇄물을 재활용하는데, 패각의 종류에 제한되지 않으며 CaCO3의 함량이 높은 것일수록 좋다. 패각은 CaCO3가 주성분이므로 이 패각을 이용하여 댐블록으로 만들면 승온 또는 용강중에서 CaCO3는 CaO+CO2로 분해되며, 분해된 댐블록내의 CaO가 용강중의 Al2O3의 개재물과 반응하여 구상으로 되면서 부상분리되어 이를 제거할 수 있다.
In the present invention, the shell pulverized recycle, but is not limited to the type of shell, the higher the content of CaCO 3 is better. Since the shell is composed of CaCO 3 as the main component, if the shell is made into a dam block, CaCO 3 is decomposed into CaO + CO2 at elevated temperature or molten steel, and CaO in the decomposed dam block reacts with the inclusions of Al 2 O 3 in the molten steel. Can be separated and removed.
패각분은 입자크기는 5mm이하로 함이 바람직한데, 그 이유는 패각의 입자가 너무 크면 댐블록에 결함으로 작용하여 강도를 저하시킬 우려가 있고, 패각분의 입자가 너무 적으면, 시공상의 문제를 야기한다.
The shell size is preferably 5 mm or less. The reason is that if the shell particles are too large, they may act as a defect in the dam block and lower the strength. If the shell powder is too small, construction problems may occur. Cause.
패각분의 첨가량은 20-30중량%로 하는 것이 바람직한데, 그 이유는 20중량% 이하로 첨가하면 용강중의 개재물 포집능이 부족하며, 30중량%를 초과하여 첨가하면 댐블록의 내용성이 떨어지기 때문이다.
The addition amount of shell meal is preferably 20-30% by weight, because if it is added below 20% by weight, the trapping ability of inclusions in molten steel is insufficient. Because.
[알루미나 분말][Alumina Powder]
알루미나 분말은 유입재의 유동성을 높여주는 동시에 열간 사용시 마그네시아와 반응하여 스피넬의 생성을 용이하게 하고, 생성된 스피넬에 의해 용강이나 스래그의 침윤을 억제하는데 유리한 역할을 하면서 열간에서의 강도도 증진시킨다. 알루미나 분말의 크기는 0.5마이크론 이하의 초미분을 사용하는 것이 바람직하다. 알루미나 분말의 첨가량은 5-10중량% 사용하는 것이 바람직한데, 그 이유는 4중량% 미만 사용시는 열간에서의 강도가 충분치 못하며 10중량%를 초과하면 열간에서 사용시 과량의 스피넬 생성으로 과도하게 팽창되어 붕괴할 가능성이 있다. 또한 다량의 스피넬생성으로 내화물의 조직이 느슨하게 되어 스래그 침윤 억제효과도 감소된다.
The alumina powder enhances the flowability of the inflow material and facilitates the generation of spinel by reacting with magnesia during hot use, and also plays an advantageous role in suppressing infiltration of molten steel or slag by the produced spinel, and also enhances the strength in the hot zone. The size of the alumina powder is preferably 0.5 micron or less ultra fine powder. It is preferable to use 5-10% by weight of the alumina powder, because the strength at the time of use less than 4% by weight is insufficient, and if it exceeds 10% by weight, it is excessively expanded due to the formation of excess spinel during the use in the heat. There is a possibility of collapse. In addition, the formation of a large amount of spinel loosens the tissue of the refractory, which reduces the effect of inhibiting slag infiltration.
[알루미나 시멘트][Alumina Cement]
알루미나시멘트는 마그네시아질 캐스타블에서 경화제 및 결합제 역할을 하는 것으로, 알루미나시멘트의 첨가량이 2중량% 미만이면 경화제 및 결합제로서의 기능이 미약하여 경화시간이 길 뿐 아니라 건조강도가 부족하다. 6중량%를 초과할 때는 내침식성 및 용적안정성이 저하된다.
The alumina cement serves as a curing agent and a binder in the magnesia castable. When the amount of the alumina cement added is less than 2% by weight, the alumina cement has a weak function as a curing agent and a binder, and thus the curing time is long and the drying strength is insufficient. When it exceeds 6 weight%, erosion resistance and volume stability fall.
[헥사메타인산소다][Sodium hexametaphosphate]
헥사메타인산소다는 시판되고 통상의 공업용 분말로 마그네시아질 유입재에 대하여 유동성을 부여하는 동시에 상온 및 고온에서 결합제로서의 강도발현 역할을 한다. 유입재에 사용시 저온에서는 알루미나시멘트 및 마그네시아에 대하여 경화제로서 작용하기 때문에 건조강도를 향상시키고, 중간온도 범위에서는 알루미나시멘트의 강도저하를 보강해준다. 또한 고온에 있어서는 패각의 주성분인 CaO성분과 반응하여 고온에서 안정한 물질인 나트륨레나타이트(Na2O·2CaO·P2O5)를 생성하여 열간강도를 부여하게 된다. 헥사메타인산소다를 3중량% 미만 사용하게 되면 수분 소요량이 많아지고 경화도 빨리 진행되어 시공하기가 어려워지며, 블록이 제조되더라도 댐블록을 건조할때 건조체에 균열이나 휨이 발생하여 댐으로서 부적합하며, 건조강도도 충분치 못하다. 또한 헥사메타인산소다를 6중량% 초과하여 사용하면 열간강도 및 소성강도가 저하되며 내침식성도 저하된다.
Sodium hexametaphosphate is a commercially available industrial powder that imparts fluidity to the magnesia influx and at the same time acts as a strength strength binder at room temperature and high temperature. When used in the inflow material, it acts as a curing agent for alumina cement and magnesia at low temperatures, and thus improves the dry strength, while reinforcing the strength reduction of the alumina cement at an intermediate temperature range. In addition, at high temperatures, it reacts with the CaO component, which is the main component of the shell, to produce sodium lenaite (Na 2 O · 2CaO · P 2 O 5 ), which is a stable substance at high temperature, to impart hot strength. If less than 3% by weight of hexametaphosphate is used, the water demand increases and the curing progresses quickly, making it difficult to install, and even if the block is manufactured, it is unsuitable as a dam due to cracks or warpage in the drying body when the dam block is dried. Dry strength is not enough. In addition, the use of more than 6% by weight of hexametaphosphate decreases the hot strength and the plastic strength and also the erosion resistance.
이하, 본 발명을 실시예를 통하여 보다 구체적으로 설명한다. Hereinafter, the present invention will be described in more detail with reference to Examples.
[실시예]EXAMPLE
표 1과 같이 각 성분들을 배합하고 배합비에 따른 물성을 측정하여 표 1에 나타내었다.
As shown in Table 1, the components were combined and the physical properties according to the mixing ratios were measured and shown in Table 1.
유입재로서의 시공성 평가를 위한 플로우(flow)값의 측정은 다음과 같이 실시하였 다. 내경 100mm의 플로우콘(flow cone)을 유동도측정기의 금속제원판 중앙에 놓고 혼련된 시료를 약 1Kg 충진한 다음 플로우콘을 제거후 괴상의 시료만 남게되면 원판에 충격을 가한다. 원판의 상하 충격에 의해 원판상의 시료는 유동성의 크기에 따라 넓게 퍼진다. 15회 타격을 준후 유동된 재료의 최장부와 최단부를 측정하여 그 평균값을 플로우값으로 하였다. 일반물성용 시편은 40mmx40mmx160mm의 크기로, 침식시험용시편은 50mm(뒷면)x30mm(앞면)x20mm(두께)x160mm(길이)크기의 횡제리형으로 유입성형하여 25℃로 일정하게 유지된 항온항습조에서 24시간 양생후 건조기에서 110℃로 24시간 건조하여 제 특성을 측정하였다. The flow value for evaluating the workability as an inflow material was measured as follows. Place a 100mm inner cone of the flow meter in the center of the metal plate of the flow meter, fill the kneaded sample with about 1Kg, and remove the flow cone. Due to the up-and-down impact of the disc, the sample on the disc spreads widely according to the size of fluidity. After 15 blows, the longest part and the shortest part of the flowed material were measured, and the average value was taken as the flow value. The specimens for general properties are 40mmx40mmx160mm, and the specimens for erosion test are 50mm (back) x30mm (front) x20mm (thickness) x160mm (length) sized cross-sectional type inflow molding and kept constant at 25 ℃ in 24 After curing for 24 hours, drying was performed at 110 ° C. for 24 hours to measure properties.
표 1의 발명예(1-3)은 본 발명을 만족하는 댐블록의 내화조성으로 비교예에 비하여 일반물성 및 내식성이 우수함을 알 수 있다.
Inventive Example (1-3) of Table 1 shows that the general properties and corrosion resistance of the dam block satisfying the present invention are superior to those of the comparative example.
반면 비교예(1)과 비교예(2)는 용강의 청정도를 높이기 위해 패각의 분쇄물을 첨가한 것으로, 비교예(1)의 경우 패각 분쇄물의 첨가량이 적은 것으로 일반물성에 있어서는 큰 차이가 없으나, 본 발명이 의도하는 용강 청정성 향상 측면에서는 바람직하지 않다. 비교예(2)는 패각 분쇄물의 첨가량이 청구범위를 초과한 것으로 댐블록의 강도를 저하시켜 사용시 붕괴의 되는 문제점이 있다. 비교예(3)은 알루미나분말의 사용량이 적은 것으로 내식성이 부족하며, 열간에서의 강도발현이 미약하여 턴디쉬 댐으로 사용중 붕괴될 가능성이 있다. 비교예(4)는 알루미나 분말을 초과하여 첨가한 것으로, 열간에서 스피넬이 과도하게 생성되어 내식성이 저하되었다. 비교예(5)와 비교예(6)은 알루미나시멘트의 첨가량이 본 발명의 범위를 벗어난 것으로 열간강도 및 내침식성이 저하되는 것을 확인할 수 있었다. 비교예(7)과 비교예(8)은 헥사메타인산소다의 첨가량이 청구범위를 벗어난 것으로 혼련시 수분이 많이 소요되며, 경화가 빨리 진행되어 시공성이 좋지 못하였고 건조된 시편은 균열이 발생되거나 휨현상이 나타났다. 따라서, 상온강도 및 열간강도가 약하였다. 비교예(7)은 헥사메타인산소다의 첨가량이 적은 것으로 건조강도 및 열간강도가 약함을 알 수 있다. 비교예(8)은 헥사메타인산소다가 많이 첨가된 것으로 상온에서의 강도는 우수하나 열간에서 저융물질로인하여 열간강도 및 내침식식성이 약하였다.
On the other hand, Comparative Example (1) and Comparative Example (2) was added to the shell pulverized to increase the cleanliness of the molten steel, in the case of Comparative Example (1) the addition amount of the shell crushed is not a big difference in general physical properties, However, it is not preferable in view of the improvement of molten steel cleanliness intended by the present invention. Comparative Example (2) has a problem in that the addition amount of the shell pulverization exceeds the claims, which lowers the strength of the dam block and collapses during use. In Comparative Example (3), the use amount of alumina powder is low, and the corrosion resistance is insufficient, and the strength is weakly expressed in the hot state, which may collapse during use as a tundish dam. Comparative Example (4) was added in excess of the alumina powder, the spinel excessively generated in the hot and the corrosion resistance was reduced. Comparative Example (5) and Comparative Example (6) was confirmed that the addition amount of the alumina cement is out of the scope of the present invention, the hot strength and erosion resistance is lowered. In Comparative Example (7) and Comparative Example (8), the amount of hexametaphosphate added was out of the claims, it takes a lot of moisture when kneading, hardening progressed quickly, poor workability, and the dried specimen had cracks or Warpage phenomenon appeared. Therefore, room temperature strength and hot strength were weak. Comparative Example (7) is a small addition amount of sodium hexametaphosphate, it can be seen that the dry strength and the hot strength is weak. In Comparative Example (8), a lot of hexametaphosphate was added, and the strength was excellent at room temperature, but the hot strength and erosion resistance were weak due to the low melting material in the hot.
본 발명은 패각분의 CaO원을 이용하여 용강중의 개재물을 포집하여 강의 청 정도를 높일 수 있는 내화조성물에 관한 것으로, 개재물의 포집능이 요구되는 여타의 용도에 적용할 수 있다. 따라서, 본 발명에서 턴디쉬 댐을 실시예로 들어 설명하고 있으나, 본 발명의 특허청구범위에 기재된 기술적 사상과 실질적으로 동일한 구성을 갖고 유사한 작용효과를 제공하는 내화조성물을 턴디쉬 댐블럭외의 다른 용도로 사용하더라도 이는 본 발명의 기술적 범위에 포함된다.
The present invention relates to a refractory composition capable of increasing the cleanliness of steel by capturing inclusions in molten steel using a CaO source of shell powder, and can be applied to other applications requiring the capturing ability of inclusions. Therefore, the present invention has been described as an example of the tundish dam, but other uses other than the tundish dam block refractory composition having a configuration substantially the same as the technical idea described in the claims of the present invention and providing a similar effect. Even if used as is included in the technical scope of the present invention.
상술한 바와 같이, 본 발명은 패각의 분쇄물을 첨가하여 턴디쉬용 댐블록을 제조함으로써 용강의 개재물 제거효과에 용이한 댐블록을 제공할 수 있는 유용한 효과가 있는 것이다.As described above, the present invention has a useful effect that can provide a dam block easy to remove the inclusions in the molten steel by adding a crushed shell to produce a tundish dam block.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6424068A (en) * | 1987-07-20 | 1989-01-26 | Kawasaki Refractories Co Ltd | Magnesia-calcia-base refractories |
| JPH01111779A (en) * | 1987-10-26 | 1989-04-28 | Kawasaki Refract Co Ltd | Basic castable refractory |
| JPH0920551A (en) * | 1995-07-06 | 1997-01-21 | Kyushu Refract Co Ltd | Magnesia refractory mixed with calcia/titania-based compound oxide |
| KR19980072301A (en) * | 1997-03-04 | 1998-11-05 | 류수착 | Basic Refractory Using Shellfish and Its Manufacturing Method |
| JP2000335978A (en) * | 1999-05-26 | 2000-12-05 | Yotai Refractories Co Ltd | Castable refractory material |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6424068A (en) * | 1987-07-20 | 1989-01-26 | Kawasaki Refractories Co Ltd | Magnesia-calcia-base refractories |
| JPH01111779A (en) * | 1987-10-26 | 1989-04-28 | Kawasaki Refract Co Ltd | Basic castable refractory |
| JPH0920551A (en) * | 1995-07-06 | 1997-01-21 | Kyushu Refract Co Ltd | Magnesia refractory mixed with calcia/titania-based compound oxide |
| KR19980072301A (en) * | 1997-03-04 | 1998-11-05 | 류수착 | Basic Refractory Using Shellfish and Its Manufacturing Method |
| JP2000335978A (en) * | 1999-05-26 | 2000-12-05 | Yotai Refractories Co Ltd | Castable refractory material |
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