KR20090076011A - Refractories of submerged entry nozzle for continuos casting - Google Patents

Refractories of submerged entry nozzle for continuos casting Download PDF

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KR20090076011A
KR20090076011A KR1020080001723A KR20080001723A KR20090076011A KR 20090076011 A KR20090076011 A KR 20090076011A KR 1020080001723 A KR1020080001723 A KR 1020080001723A KR 20080001723 A KR20080001723 A KR 20080001723A KR 20090076011 A KR20090076011 A KR 20090076011A
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parts
nozzle
refractories
weight
continuous casting
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KR100916145B1 (en
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나용한
최상배
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조선내화 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/64—Drying; Dehydration; Dehydroxylation
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B25/00—Annealing glass products
    • C03B25/02—Annealing glass products in a discontinuous way
    • C03B25/025—Glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/145—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by top-side transfer or supporting devices, e.g. lifting or conveying using suction
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/20—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by gripping tongs or supporting frames
    • C03B35/202—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by gripping tongs or supporting frames by supporting frames
    • C03B35/207—Construction or design of supporting frames

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

Refractories for a submerged nozzle for continuous casting mold are provided to allow alpha-alumina to be easily transformed into a low-melting point compound when the alpha-alumina adheres to the inner surface of the nozzle within a temperature range of 1500~1600°C. Refractories for a submerged nozzle for continuous casting mold is composed of 35-85 parts of calcium zirconate of which main component is CaO.ZrO2, 10-30 parts of graphite, 2-13 parts of calcium silicate(CaO.SiO2), 3-24 parts of 2CaO.SiO2 and 0.01-2 parts of B2O3. The refractories are arranged on the inner wall(1a) having an inner space of the submerged nozzle or the inner wall(6a) of a discharge path(6). The refractories can be arranged on both the inner wall of the submerged nozzle and the inner wall of the discharge path.

Description

연속주조용 침지노즐의 내화물{refractories of submerged entry nozzle for continuos casting}Refractories of submerged entry nozzle for continuos casting

본 발명은 용강의 연속주조용 침지노즐에 관한 것으로, 보다 상세하게는 강의 연속주조시 장시간 사용에도 비금속 개재물 부착에 의한 노즐 막힘을 방지하는데 적합한 침지노즐의 내화물에 관한 것이다.The present invention relates to an immersion nozzle for continuous casting of molten steel, and more particularly, to a refractory of an immersion nozzle suitable for preventing nozzle clogging due to attachment of non-metallic inclusions even when used for a long time in continuous casting of steel.

용강의 연속주조용 침지노즐은 턴디쉬에서 몰드로 용강 주입시 용강의 산화를 방지하고 용강의 비산을 방지하기 위해 사용되며, 나아가서는 비금속 개재물 및 몰드면의 부유물이 주편으로 혼입되는 것을 방지하기 위해 주탕의 정류화 등의 목적으로 사용된다.The immersion nozzle for continuous casting of molten steel is used to prevent the oxidation of molten steel and the scattering of molten steel when molten steel is injected into the mold from the tundish, and further, to prevent the incorporation of non-metallic inclusions and floats on the mold surface into the cast steel. It is used for the purpose of rectifying pouring alcohol.

도 1은 기존의 침지노즐에 대한 단면도를 나타낸 것으로, 턴디쉬내의 용강이 주형내로 유입되는 내공부(1), 외주부(2), 노즐본체의 외면 중 용융몰드파우더1 is a cross-sectional view of a conventional immersion nozzle, the molten mold powder of the inner surface of the molten steel in the tundish (1), the outer peripheral portion (2), the outer surface of the nozzle body

(3)와 용강(4)에 접하는 부분인 슬라그라인부(5)와 토출공부(6) 및 바닥부(7)로 이루어진다. (3) and the slit line portion 5, which is a part in contact with the molten steel 4, the discharge hole (6) and the bottom portion (7).

종래의 연속주조용 침지노즐 재질은 주로 흑연, 알루미나, 실리카, 시리콘-카바이드 등으로 구성되어 있다. 그러나 알루미늄-killed강 등을 주조하는 경우 다 음과 같은 문제가 있다.The conventional continuous casting immersion nozzle material is mainly composed of graphite, alumina, silica, silicon carbide, and the like. However, casting aluminum-killed steel has the following problems.

알루미늄-killed강 등은 탈산제로 첨가되는 알루미늄이 용강 중에 존재하는 산소와 반응하여 α-alumina 등의 비금속 개재물이 생성된다. 이 때문에 알루미늄 -killed강 등을 주조하는 경우 연속주조용 노즐 내공부(1) 내벽면에 α-alumina등의 비금속개재물이 부착되고 축적되어 노즐 내공이 좁아지고 최악의 경우 폐쇄되어 안정적인 주조가 곤란하게 된다. 또한 이렇게 부착된 α-alumina등의 비금속개재물은 탈락되어 주편으로 들어가 주편의 품질저하를 초래한다.Aluminum-killed steel and the like react with oxygen present in molten steel to produce non-metallic inclusions such as α-alumina. Therefore, in the case of casting aluminum-killed steel, non-metallic inclusions such as α-alumina are attached to the inner wall of the continuous hole of the nozzle for continuous casting (1), and the hole in the nozzle is narrowed. do. In addition, the non-metallic inclusions such as α-alumina attached are dropped off and enter the cast steel, causing the cast quality to deteriorate.

상기한 α-alumina등의 비금속개재물에 의한 내공의 축소 및 폐쇄를 방지하기 위해 내공부(1)를 형성하는 연속주조용 노즐의 내면에 불활성가스를 분사시켜 용강 중에 존재하는 α-alumina등의 비금속개재물이 연속주조용 노즐 내공부의 내벽면에 부착되는 것을 방지하는 방법이 넓게 이용되고 있다. Non-metals such as α-alumina present in molten steel by injecting an inert gas to the inner surface of the continuous casting nozzle forming the inner cavity 1 to prevent shrinkage and closure of the inner pores by the non-metallic inclusions such as α-alumina. A method of preventing the inclusions from adhering to the inner wall surface of the inner hole of the continuous casting nozzle is widely used.

그러나 이 방법은 분출되는 불활성가스의 량이 많으면 불활성가스에 의해 생겨난 기포가 주편에 혼입되어 pin hole성 결함이 발생되고 반대로 불활성가스량이 적으면 α-alumina등의 비금속개재물이 연속주조용 노즐의 내공부의 내벽면에 부착되어 내공이 좁아지고 최악의 경우 내공이 폐쇄된다. 또한 이 방법은 불활성가스를 주입을 위한 제반 설비에 드는 비용 및 대량의 불활성가스 사용으로 제조비용이 많아지는 문제가 있다.However, in this method, if the amount of inert gas is ejected, bubbles generated by the inert gas are mixed in the cast steel and pinhole defects are generated. On the contrary, if the amount of inert gas is small, non-metallic inclusions such as α-alumina are used in the inner part of the continuous casting nozzle. It is attached to the inner wall surface of the hole, narrowing the hole and in the worst case, the hole is closed. In addition, this method has a problem in that the manufacturing cost is increased by using a large amount of inert gas and the cost of various facilities for inert gas injection.

상기 문제점을 해결하기 위한 종래의 노즐 내공부의 재질적 대책으로 다음과 같은 방법이 이용되고 있다.In order to solve the above problems, the following method is used as a material countermeasure for the internal part of the nozzle.

일본특개평5-228593호에는 CaO.ZrO2 의 분해에 의한 CaO성분의 방출 및 표면으로 이동 응집을 쉽게하기 위한 수단으로 CaO성분 증량재로서의 성질을 함께 갖는 CaO·SiO2 (CaO 40∼54중량%)를 첨가한 재질이 개시되었으며 이 경우 부착개재물인 Al2O3 와 반응하여 저융점화합물을 생성한 후 가동면에 요철이 형성되어 요철부에 비금속개재물이 축적되어 장시간 사용이 곤란하게 되는 것으로 판명되었다.Japanese Patent Laid-Open No. 5-228593 discloses CaO.SiO 2 (CaO 40 to 54 wt%) having both properties as a CaO component extender as a means for facilitating the release of CaO components and the mobile aggregation to the surface by decomposition of CaO.ZrO 2 . %) Is added, and in this case, it reacts with Al 2 O 3 , which is an adhesion inclusion, to form a low melting point compound, and then irregularities are formed on the movable surface, and non-metallic inclusions accumulate in the irregularities, making it difficult to use for a long time. It turned out.

상기와 같이 노즐 내공부가 폐쇄되지 않는 용강 연속주조용 침지노즐 재질의 개발이 연구되어 왔으나 지금까지 개발된 재질은 CaO·ZrO2 의 분해로부터 나오는 CaO성분의 방출속도가 느리고 방출된 CaO성분의 확산이 기공에 의해 제한되거나 내화재료내에 Al2O3 성분을 함유하는 경우 CaO성분의 확산 이동을 위한 구동력 약화로 장시간에 걸쳐 지속적으로 노즐 내공부의 내벽면으로 CaO 공급이 원활하지 못하여 효과적으로 부착개재물을 저융점 화합물로 용손시키는 연속주조용 침지노즐의 재질이 아직 제안되고 있지 않다.As described above, the development of immersion nozzle material for continuous casting of molten steel in which the nozzle inner cavity is not closed has been studied, but the material developed so far is CaO · ZrO 2 When the release rate of CaO component from decomposition of is slow and diffusion of released CaO component is limited by pores or contains Al 2 O 3 component in the refractory material, it is continuously continued for a long time by weakening driving force for diffusion movement of CaO component. Since the CaO supply is not smooth to the inner wall of the nozzle cavity, the material of the continuous casting immersion nozzle for effectively dissolving the attachment inclusions into the low melting point compound has not been proposed.

본 발명은 상기한 종래의 문제점을 개선하기 위한 것으로, 흑연-칼슘지르코네이트질 또는 흑연-칼슘지르코네이트질과 칼슘실리게이트질을 적용하되 여기에 2CaO·SiO2 및 B2O3 원료를 적절히 배합하여 침지노즐 사용온도(1500∼1600℃)구간에서 부착개재물인 α-alumina가 침지노즐 내공부의 내벽면에 부착시 쉽게 저융점 화 합물이 형성되도록하며 나아가 저융점 화합물 생성온도도 침지노즐 사용온도로 한정되도록 설계하여 개재물 부착억제에 있어서 최적화된 제품을 갖도록 하는데 그 목적이 있다The present invention is to improve the above-mentioned conventional problems, and apply graphite-calcium zirconate or graphite-calcium zirconate and calcium silicate, wherein 2CaO.SiO 2 And B 2 O 3 by properly mixing the material, α-alumina attached to the inner wall of the immersion nozzle in the immersion nozzle operating temperature (1500 ~ 1600 ℃) to easily form a low melting point compound Its purpose is to ensure that the melting point compound production temperature is limited to the immersion nozzle use temperature so that it has an optimized product in suppressing inclusion adhesion.

상기한 목적 달성을 위한 본 발명은 CaO·ZrO2 를 주성분으로 하는 칼슘지르코네이트 35∼85중량부, 흑연 10∼30중량부, 칼슘실리게이트(CaO·SiO2 ) 2∼13중량부, 2CaO·SiO2 3∼24중량부, B2O3 0.01∼2중량부로 조성되어 이루어진다. The present invention for achieving the above object is CaOZrO 2 Calcium zirconate containing 35 to 85 parts by weight, graphite 10 to 30 parts by weight, calcium silicate (CaO · SiO 2 ) 2 to 13 parts by weight, 2CaO · SiO 2 3-24 parts by weight, B 2 O 3 is made of 0.01~2 parts by weight of the composition.

도 2는 본 발명에 적용되는 침지노즐에 대한 단면도를 나타낸 것으로, 턴디쉬내의 용강이 주형내로 유입되는 내공부(1)를 갖는 내벽면(1a), 외주부(2), 노즐본체의 외면 중 용융몰드파우더(3)와 용강(4)에 접하는 부분인 슬라그라인부(5)와 토출공부(6)의 내벽면(6a) 및 바닥부(7)로 이루어진다. Figure 2 is a cross-sectional view of the immersion nozzle applied to the present invention, the inner wall surface (1a), the outer peripheral portion (2) having an inner cavity (1) through which the molten steel in the tundish flows into the mold, the melting of the outer surface of the nozzle body It consists of a slug grain portion 5 which is a part in contact with the mold powder 3 and the molten steel 4, and an inner wall surface 6a and a bottom portion 7 of the discharge hole 6.

상기한 조성을 갖는 발명의 조성에서 2CaO·SiO2 및 B2O3 는 고온의 침지노즐 사용구간에서 부착 개재물인 α-alumina 가 노즐 내공부의 내벽면(1a) 또는 토출공부의 내벽면(6a)에 부착시 쉽게 저융점 화합물을 형성하므로서 개재물 부착억제로 사용수명이 향상된 최적화된 제품을 얻을 수 있다. 2CaOSiO 2 in the composition of the invention having the above composition And B 2 O 3 is an α-alumina, which is an attachment inclusion in a high temperature immersion nozzle use section, to easily form a low melting point compound when attached to the inner wall surface 1a of the nozzle inner cavity or the inner wall surface 6a of the discharge cavity. Suppression results in an optimized product with improved service life.

또한 본 발명은 내열충격성 향상을 위해 상기한 조성에 SiO2 3∼20중량부를 포함할 수도 있다.In addition, the present invention is SiO 2 in the above composition to improve the thermal shock resistance It may also contain 3 to 20 parts by weight.

상기한 조성을 갖는 원료를 사용함에 있어, 2CaO·SiO2 함유량이 3중량부 미 만이면 상기한 첨가 효과를 기대할 수 없으며, 24중량부를 초과하면 과다한 저융점 화합물의 생성으로 짧은 시간에 본 발명 침지노즐이 용손되어 장시간 연속주조를 위한 지속적인 효과 발현을 기대할 수 없다.In using a raw material having the above composition, 2CaOSiO 2 If the content is less than 3 parts by weight, the above-mentioned addition effect cannot be expected, and if it exceeds 24 parts by weight, the immersion nozzle of the present invention can be melted in a short time due to the generation of excessively low melting point compound, and the continuous effect expression for continuous casting for a long time can be expected. none.

B2O3 함유량은 0.01∼2중량부 적용함이 바람직한 것으로, 그 함유량이 0.01 중량부 미만인 경우는 10㎛이하 입도의 Al2O3와의 반응시험에서 1600℃이상에서 액상생성이 시작되어 주조온도(1450∼1600℃)에서 액상생성이 어려운 것으로 확인되었고, 또한 그 함유량이 2중량부를 초과하면 10㎛이하 입도의 Al2O3 첨가 없이도 1450℃에서 액상이 형성되어 침지노즐에 적용시 Al2O3 가 부착되기 전에 과용손으로 손실되어 부착방지 기능발현이 어려운 것으로 나타났다. The content of B 2 O 3 is preferably 0.01 to 2 parts by weight. When the content is less than 0.01 parts by weight, liquid phase production starts at 1600 ° C or higher in a reaction test with Al 2 O 3 having a particle size of 10 µm or less. was found to be difficult to produce a liquid phase in (1450~1600 ℃), also when the content is 2 parts by weight excess of the liquid is formed at 1450 ℃ without the addition of Al 2 O 3 Al 2 O 10㎛ particle size below when applied to the immersion nozzle 3 It was found that it was difficult to express the anti-sticking function because it was lost by overuse before attachment.

이상에서와 같은 조성에 따라 본 발명은 침지노즐 사용온도(1500∼1600℃)구간에서 부착개재물인 α-alumina가 노즐 내공부의 내벽면(1a)에 부착시 쉽게 저융점 화합물이 형성되도록 하며 나아가 저융점 화합물 생성온도도 침지노즐 사용온도로 한정되도록 설계하여 개재물 부착억제에 있어서 최적화된 침지노즐을 얻을 수 있다.According to the composition as described above, the present invention allows the low melting point compound to be easily formed when α-alumina, which is an adhesion inclusion, is attached to the inner wall surface 1a of the nozzle cavity at the immersion nozzle using temperature (1500 to 1600 ° C). The low melting point compound production temperature is also designed to be limited to the immersion nozzle use temperature to obtain an immersion nozzle optimized for inclusion deposition inhibition.

본 발명 실시예Inventive Example 비교발명Comparative invention 1  One 2  2 3  3 4  4 55 6  6 7   7 배합 조성 (중량부)    Compounding composition (parts by weight) 흑연black smoke 25 25 1515 1515 2828 1010 18 18 2020 CaO·ZrO2 CaOZrO 2 6565 6060 5050 4040 7575 47.5 47.5 7070 CaO·SiO2 CaOSiO 2 55 55 55 1010 55 5 5 1010 2CaO·SiO2 2CaOSiO 2 4.84.8 14.514.5 14.514.5 21.521.5 19.519.5 28 28 B2O3 B 2 O 3 0.20.2 0.50.5 0.50.5 1.21.2 0.70.7 2.2 2.2 SiO2 SiO 2 55 1515 물리 특성  Physical properties 기공율(%)Porosity (%) 2020 2020 2020 2020 2020 20 20 2020 부피비중Volume specific gravity 2.692.69 2.722.72 2.652.65 2.652.65 2.772.77 2.74 2.74 2.762.76 개재물(α-alumina) 부착두께(mm) Inclusion (α-alumina) thickness (mm) 0 0 0 0 0.2 0.2 0 0 0 0 -2  -2 1 One 내열 충격 저항성  Thermal shock resistance 균열유무Crack presence 無Nil 無Nil 無Nil 無Nil 無Nil 有  With 無 Nil 열팽창율 (%,at1000℃)Thermal expansion rate (%, at1000 ℃) 0.48 0.48 0.48 0.48 0.40 0.40 0.40 0.40 0.58 0.58 0.6  0.6 0.51 0.51

기 (표 1)에 나타낸 조성이 되게 혼합 및 혼련하여 얻은 원료배토를 냉간정수압프레스(cold Isostatic Press)에서 1200kgf/cm2 압력으로 성형한 후 1000℃ 부근에서 소성하여 물리적 특성 시험을 하였다.The raw material soil obtained by mixing and kneading to the composition shown in Table 1 in the cold Isostatic Press (1200 cold water press) 1200kgf / cm 2 After molding under pressure, it was fired at around 1000 ° C. for physical properties.

실시예 1Example 1

강의 연속주조온도(1450℃∼1600℃)에서 본 발명에 사용된 2CaO·SiO2 와 B2O3 원료를 95% 이상이 45㎛이하 입도로 구성하여 외경 20mm, 두께 10mm로 성형하여 1700℃ 소성한 결과 액상 생성으로 인한 시편 변화는 거의 없었으나, 본 발명품의 2CaO·SiO2 와 B2O3 원료 혼합물에 부착 개재물 성분인 10㎛ 이하 입도의 Al2O3를 10% 혼합하여 외경 20mm, 두께 10mm로 성형하여 온도 상승에 따른 변화를 관찰한 결과 1450℃에서 녹기 시작하여 1550℃에서 거의 액상으로 변화하는 것이 확인되었다.2CaO · SiO 2 used in the present invention at the continuous casting temperature of steel (1450 ° C. to 1600 ° C.) And 95% of the B 2 O 3 raw material is composed of a particle size of 45㎛ or less, the outer diameter of 20mm, 10mm thick and formed at 1700 ℃ firing resulted in little change in the specimen due to the liquid phase, but 2CaO · SiO 2 of the present invention 10% of Al 2 O 3 particles with a particle size of 10㎛ or less, attached to the B 2 O 3 raw material mixture, were molded into an outer diameter of 20mm and a thickness of 10mm, and the change of temperature was observed to start melting at 1450 ℃. It was confirmed that the liquid phase was changed to almost liquid phase at ℃.

실시예 2Example 2

1580℃ 용강 중에 Al함유량을 0.03∼0.05%로 저정하여 각 재질의 샘플(형상25mm□*250mL)을 침지하여 60분간 유지 후 부착물 두께(alumina부착,mm)를 측정한 결과를 (표 1)에 나타내었다.The Al content was reduced to 0.03 to 0.05% in molten steel at 1580 ° C, and the sample (shape 25mm * 250mL) of each material was immersed for 60 minutes, and the thickness of the deposit (alumina, mm) was measured in (Table 1). Indicated.

일본특개평5-228593호에는 CaO·ZrO2 분해에 의한 CaO성분의 방출 및 내벽면이동으로 응집을 쉽게하기 위한 수단으로 CaO성분 증량재로서의 성질을 함께 갖는 CaO·SiO2 (CaO 40중량%∼54중량%)를 첨가한 재질이 개시되었으나 이 경우 비교발령시료 7로 확인한 결과 부착개재물인 Al2O3와 반응하여 저융점 화합물을 생성한 후 가동면에 요철이 형성되어 요철부에 개재물이 부착(2mm)되는 것으로 판명되었다.Japanese Patent Laid-Open No. 5-228593 discloses CaO and ZrO 2 CaO · SiO 2 having both properties as a CaO component extender as a means for facilitating aggregation by release of CaO component by decomposition and movement of inner wall surface (CaO 40% to 54% by weight) is added to the material is disclosed, but in this case, as confirmed by the comparative sample 7 as a result of reacting with Al 2 O 3 as the inclusion inclusions to form a low melting point compound, irregularities are formed on the movable surface It was found that inclusions were attached (2 mm) to the uneven portion.

2CaO·SiO2 와 B2O3의 합이 25중량부를 초과 함유한 경우를 비교발령 시료 6을 확인한 결과 부착개재물인 Al2O3와 과다 반응으로 시편의 용손(-2mm)이 확인되어 안정사용에 문제가 있는 것으로 판명되었다.2CaOSiO 2 Comparative Example 6 confirmed that the sum of and B 2 O 3 contained more than 25 parts by weight. As a result, an excessive reaction with Al 2 O 3 , which is an inclusion inclusion, resulted in a melt loss ( -2 mm) of the specimen. It turned out to be.

실시예 3Example 3

1580℃ 용강 중에 재질의 샘플(형상25mm□*250mL)을 침지하여 10분간 유지 후 25℃ 물에 수냉시켜 시편의 균열 발생여부를 확인한 결과 2CaO·SiO2 와 B2O3의 합이 25중량부를 초과 함유한 비교발명 시료6에서 균열 발생이 확인되었다.After dipping a sample of material (shape 25mm □ * 250mL) in molten steel at 1580 ℃ for 10 minutes, and cooling it in water at 25 ℃, it was confirmed that the specimen was cracked. 2CaO · SiO 2 Cracking was observed in Comparative Invention Sample 6 in which the sum of and B 2 O 3 contained more than 25 parts by weight.

실시예 4Example 4

본 발명의 시료 1 재질을 침지노즐 내벽면에 배치하여 래들 300톤, 턴디쉬 용량 80톤의 Al-killed강(Al함유량 0.03∼0.05%)의 Slab연주기의 1번 Strand에 Set하고, 2번 Strand에는 불활성가스 주입 방식의 침지노즐을 Set하여 실기에서 비교 테스트를 실시하였다. 2번 Stran에 비하여 1번 Strand에서의 개재물 부착량은 부위에 따라 차가 있으나 약 10∼30% 감소하는 양호한 결과를 얻었다.Sample 1 material of the present invention was placed on the inner wall of the immersion nozzle and set in No. 1 Strand of Slab lead cycle of Al-killed steel (Al content 0.03 ~ 0.05%) with 300 tons ladle and 80 tons of tundish capacity, and No. 2 Strand An inert gas injection immersion nozzle was set to perform a comparative test in a practical machine. The amount of inclusions in Strand 1 was different by site compared to Stran 2, but about 10 ~ 30% was decreased.

상기한 본 발명의 조성을 노즐 내공부 내벽면(1a)의 위치 또는 토출공부의 내벽면(6a)의 위치에 배치하거나, 내공부의 내벽면(1a)과 토출공부의 내벽면(6a)에 모두 배치하여 구성하였다. The composition of the present invention described above is disposed at the position of the inner wall surface 1a of the nozzle inner cavity portion or the position of the inner wall surface 6a of the discharge cavity, or on both the inner wall surface 1a of the inner cavity portion and the inner wall surface 6a of the discharge cavity. Arrangement was made.

내공부의 내벽면(1a) 재질의 두께는 15mm 이하로 하였으며 토출공부 내벽면 (6a) 두께에 대하여는 제한을 두지 않았다.The thickness of the inner wall surface 1a of the inner cavity was set to 15 mm or less, and there was no limitation on the thickness of the inner wall surface 6a of the discharge cavity.

노즐외주부(2)위치에는 C, Al2O3 ·SiO2 및 SiC 등으로 구성하였고, 슬라그라인부(5) 위치에는 C, ZrO2 및 SiC 등으로 구성되어 슬라그에 대한 고내식성을 갖도록 설계하였다.C, Al 2 O 3 and SiO 2 at the nozzle outer peripheral part (2) And SiC and the like, and the position of the sgrain grains (5) is C, ZrO 2 And it is composed of SiC and the like designed to have a high corrosion resistance to slag.

노즐바닥부(7)위치는 C, ZrO2 및 SiC 등으로 구성되어 토출공부 내벽면 재질과 화학적 반응이 일어나지 않도록 하였다.Nozzle bottom (7) position C, ZrO 2 And SiC and the like so as not to cause a chemical reaction with the material of the inner wall surface of the discharge hole.

도 1은 기존의 침지노즐을 나타낸 개략단면도1 is a schematic cross-sectional view showing a conventional immersion nozzle

도 2는 본 발명의 침지노즐을 나타낸 개략단면도Figure 2 is a schematic cross-sectional view showing the immersion nozzle of the present invention

1: 내공부 1a: 내공부의 내벽면 6: 토출공부 DESCRIPTION OF SYMBOLS 1: Inner part 1a: Inner wall surface of inner part 6: Discharge part

6a: 토출공부의 내벽면6a: Inner wall surface of discharge study

Claims (3)

CaO·ZrO2 를 주성분으로 하는 칼슘지르코네이트 35∼85중량부, 흑연 10∼30중량부, 칼슘실리게이트(CaO·SiO2 ) 2∼13중량부, 2CaO·SiO2 3∼24중량부, B2O3 0.01∼2중량부 조성된 조성물이 용강의 연속주조용 침지노즐의 내공부를 갖는 내벽면 또는 토출공부의 내벽면에 배치하여서 됨을 특징으로 하는 연속주조용 침지노즐의 내화물CaOZrO 2 Calcium zirconate containing 35 to 85 parts by weight, graphite 10 to 30 parts by weight, calcium silicate (CaO · SiO 2 ) 2 to 13 parts by weight, 2CaO · SiO 2 3 to 24 parts by weight, B 2 O 3 0.01 to 2 parts by weight The composition of the continuous casting immersion, characterized in that the composition is disposed on the inner wall surface having the inner hole of the continuous casting immersion nozzle of molten steel or the inner wall surface of the discharge hole Refractory of the nozzle 제 1항에 있어서,The method of claim 1, 상기 조성에 SiO2 가 3∼ 20 중량부 포함됨을 특징으로 하는 연속주조용 침지노즐의 내화물Refractory of the immersion nozzle for continuous casting, characterized in that containing 3 to 20 parts by weight of SiO 2 in the composition 제 1항 또는 제 2항에 있어서,The method according to claim 1 or 2, 상기 조성물이 침지노즐의 내공부를 갖는 내벽면과 토출공부의 내벽면에 모두 배치하여서 됨을 특징으로 하는 연속주조용 침지노즐의 내화물Refractories of the continuous casting immersion nozzle, characterized in that the composition is disposed on both the inner wall surface having the inner hole of the immersion nozzle and the inner wall surface of the discharge hole
KR1020080001723A 2008-01-07 2008-01-07 refractories of submerged entry nozzle for continuos casting KR100916145B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016068469A1 (en) * 2014-10-31 2016-05-06 주식회사 포스코 Submerged nozzle for continuous casting
KR20160056142A (en) * 2014-11-11 2016-05-19 주식회사 포스코 Nozzle
CN107303603A (en) * 2016-04-20 2017-10-31 株式会社Posco The mouth of a river
KR20190054531A (en) 2017-11-14 2019-05-22 주식회사 포스코 Submerged nozzle and Method for treatment of molten steel
KR20200045279A (en) 2018-10-22 2020-05-04 주식회사 포스코 Apparatus and method for preventing from nozzle clogging

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JPH02172862A (en) * 1988-12-23 1990-07-04 Harima Ceramic Co Ltd Production of immersion nozzle for continuous casting
JP2579681B2 (en) * 1988-12-28 1997-02-05 ハリマセラミック株式会社 Manufacturing method of immersion nozzle for continuous casting
KR950008603B1 (en) * 1992-12-29 1995-08-03 조선내화학공업주식회사 Composition of refractories
JP2000344575A (en) 1999-06-02 2000-12-12 Akechi Ceramics Co Ltd Graphite-containing refractory for melting high purity aluminum

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016068469A1 (en) * 2014-10-31 2016-05-06 주식회사 포스코 Submerged nozzle for continuous casting
JP2018501109A (en) * 2014-10-31 2018-01-18 ポスコＰｏｓｃｏ Immersion nozzle for continuous casting
KR20160056142A (en) * 2014-11-11 2016-05-19 주식회사 포스코 Nozzle
CN107303603A (en) * 2016-04-20 2017-10-31 株式会社Posco The mouth of a river
CN107303603B (en) * 2016-04-20 2020-09-04 株式会社Posco Water gap
KR20190054531A (en) 2017-11-14 2019-05-22 주식회사 포스코 Submerged nozzle and Method for treatment of molten steel
KR20200045279A (en) 2018-10-22 2020-05-04 주식회사 포스코 Apparatus and method for preventing from nozzle clogging

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