KR100530053B1 - Tundish Flux for Making Al killed Steel in Continuous Casting - Google Patents
Tundish Flux for Making Al killed Steel in Continuous Casting Download PDFInfo
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- KR100530053B1 KR100530053B1 KR10-2001-0049210A KR20010049210A KR100530053B1 KR 100530053 B1 KR100530053 B1 KR 100530053B1 KR 20010049210 A KR20010049210 A KR 20010049210A KR 100530053 B1 KR100530053 B1 KR 100530053B1
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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
Abstract
본 발명은 알루미늄 탈산강 제조를 위한 턴디쉬 플럭스(flux)에 관한 것이다. 본 발명에 의한 턴디쉬 플럭스는 중량%로, CaO: 50~ 60%, Al2O3: 30~ 40%, SiO2: 5%이하, MgO: 1~ 5%, 나머지 불가피한 불순물을 포함하여 조성되고, 상기 CaO/Al2O3의 비가 1.4~ 1.8의 범위를 갖는다.The present invention relates to tundish fluxes for the production of aluminum deoxidized steel. The tundish flux according to the present invention is in weight percent, CaO: 50 to 60%, Al 2 O 3 : 30 to 40%, SiO 2 : 5% or less, MgO: 1 to 5%, the composition including the remaining unavoidable impurities The ratio of CaO / Al 2 O 3 is in the range of 1.4 to 1.8.
이러한 턴디쉬 플럭스는 알루미늄 탈산강의 연속주조시 턴디쉬 내에 투입, 용융되어 턴디쉬 내에서 분리 부상되는 개재물을 용해 흡수하여 용강의 청정성을 확보할 수 있다.The tundish flux may be dissolved in and absorbed in the tundish during continuous casting of aluminum deoxidized steel to dissolve and absorb the inclusions separated in the tundish to secure cleanliness of molten steel.
Description
본 발명은 알루미늄 탈산강 제조를 위한 턴디쉬 플럭스(flux)에 관한 것으로서, 보다 상세하게는 알루미늄 탈산강의 연속주조시 턴디쉬(tundish) 내에 투입, 용융되어 턴디쉬 내에서 분리 부상되는 개재물을 용해 흡수하여 용강의 청정성을 확보하기 위한 턴디쉬 플럭스에 관한 것이다.The present invention relates to a tundish flux for producing aluminum deoxidized steel, and more particularly, to dissolve and absorb inclusions that are separated and floated in a tundish during continuous casting of aluminum deoxidized steel. It relates to a tundish flux for securing the cleanliness of the molten steel.
알루미늄 탈산강은 대체로 우수한 가공성과 양호한 표면 품질을 갖는 가전 제품이나 자동차 부품 등 고청정성이 요구되는 소재로 사용된다. 제강공정에서 연속주조를 통해 상기 고청정성 알루미늄 탈산강을 제조하기 위해서는 정련과정에서 용강의 성분을 엄격히 제어하고, 특히 강중 비금속개재물을 일정 수준 이하로 관리하여야 한다. 많은 제강 조업 조건이 강의 청정도에 영향을 미치며, 그 가운데 하나가 연속주조를 할 때 턴디쉬 내의 용강을 제어방식이다.Aluminum deoxidized steel is generally used as a material that requires high cleanliness such as home appliances or automobile parts having excellent workability and good surface quality. In order to manufacture the highly clean aluminum deoxidized steel through continuous casting in the steelmaking process, it is necessary to strictly control the components of molten steel in the refining process, and in particular, to manage the non-metallic inclusions in the steel below a certain level. Many steelmaking operating conditions affect the cleanliness of steel, one of which is to control molten steel in the tundish during continuous casting.
턴디쉬(1)는 도1에 도시된 바와 같이, 래들(ladle)(2)에서 유입되는 용강(3)을 받아 일정하게 주형(4)으로 공급시켜주는 장치이다. 턴디쉬 내에 주입된 용강이 대기와의 재산화되거나 용강의 온도가 강하되는 것을 방지하기 위해서 턴디쉬 내에는 분말 또는 과립상의 플럭스를 투입하게 된다. 최근 청정강 제조에 대한 관심이 고조되면서 단순한 단열 특성과 재산화 방지의 기능 뿐만 아니라 개재물 흡수 능력까지 지닌 턴디쉬 플럭스에 대한 개발이 활발히 진행되고 있다.As shown in FIG. 1, the tundish 1 receives a molten steel 3 flowing from a ladle 2 and supplies the molten steel 3 to the mold 4. In order to prevent the molten steel injected into the tundish from reoxidation with the atmosphere or the temperature of the molten steel is lowered, a powder or granular flux is introduced into the tundish. Recently, with increasing interest in the manufacture of clean steel, the development of tundish fluxes that have not only simple thermal insulation and anti-refining properties but also absorbing inclusions are actively underway.
대표적인 예로서, 대한민국 특허출원 94-23379호에는 염기도가 7 이상인 알루미늄 탈산강 제조를 위한 턴디쉬 플럭스가 개시되어 있다. 이 플럭스는 염기도가 7이상이고 CaO: 35~ 50중량%(이하, 단지 `%'), SiO2: 5%이하, Al2O3: 35~ 45%, MgO: 1~ 5%, CO2, H2O, Fe2O3 등 기타 불순 성분으로 구성된다. 그러나, 이 플럭스는 플럭스의 재산화 방지 및 용강의 보온 기능에 추가하여 턴디쉬 내화물 용손을 감소시키는데 효과적이지만, 알루미늄 탈산강의 비금속개재물 흡수능은 크게 개선되지 못한 단점이 있다.As a representative example, Korean Patent Application No. 94-23379 discloses a tundish flux for producing aluminum deoxidized steel having a basicity of 7 or more. The flux has a basicity of 7 or more and CaO: 35-50% by weight (hereafter '%'), SiO 2 : 5% or less, Al 2 O 3 : 35-45%, MgO: 1-5%, CO 2 , Other impurities such as H 2 O, Fe 2 O 3 . However, this flux is effective in reducing tundish refractory loss in addition to preventing flux reoxidation and thermal insulation of molten steel, but has a disadvantage in that the absorption of nonmetallic inclusions of aluminum deoxidized steel is not significantly improved.
이외에도 대한민국 특허출원 제2000-71264호에는 고청정 알루미늄 탈산강 제조용 턴디쉬 플럭스에 대한 제조방법이 개시되어 있다. 이 플럭스 제조방법은 1차 믹서에서 유기바인더를 이용해 생석회(CaO) 입자와 CaO-Al2O3계 산화물을 혼합하고, 2차 믹서에서 의사입자하여 입자 직경이 약 2~ 8mm인 턴디쉬 플럭스를 얻는 방법이다. 그러나, 이렇게 제조된 플럭스는 턴디쉬 내 용강의 산화를 방지하고 강중 수소농도를 증가시키지 않는 특징이 있지만, 여전히 알루미나 개재물 흡수능이 크게 개선되지 않는 단점이 있다.In addition, Korean Patent Application No. 2000-71264 discloses a manufacturing method for a tundish flux for producing highly clean aluminum deoxidized steel. This flux manufacturing method uses the organic binder in the primary mixer to mix quicklime (CaO) particles and CaO-Al 2 O 3 -based oxide, and pseudo particles in the secondary mixer to produce a tundish flux having a particle diameter of about 2 to 8 mm. How to get. However, the flux thus prepared is characterized in that it does not prevent oxidation of molten steel in the tundish and does not increase the hydrogen concentration in the steel, but still has the disadvantage that the ability to absorb alumina inclusions is not greatly improved.
또 다른 예로서, 일본 특허공개공보 평7-179929호에는 열간 턴디쉬용 플럭스의 구비해야 할 조건과 내화물 손상을 억제할 수 있는 동시에 만족하는 플럭스가 제안되어 있다. 이 플럭스는 CaO, Al2O3, SiO2, MgO, CaF2를 함유하고, 그 조성이 CaO 45~ 65%, Al2O3 5~ 15%, SiO2 5~ 15%, MgO 5~ 25%, CaF2 0.5~10%의 성분 범위에 있는 턴디쉬 첨가용 플럭스이다. 그러나, 이 플럭스 역시 기본적인 플럭스 기능, 즉 플럭스의 재산화 방지 및 용강의 보온 기능은 월등하고 턴디쉬 내화물 용손을 감소시키는데 효과적이지만, 알루미늄 탈산강의 비금속개재물 흡수능은 크게 개선되지 못한 단점이 있다.As another example, Japanese Patent Application Laid-open No. Hei 7-179929 proposes a flux which satisfies the conditions to be provided and the refractory damage of the hot tundish flux. This flux contains CaO, Al 2 O 3 , SiO 2 , MgO, CaF 2 , and its composition is CaO 45-65%, Al 2 O 3 5-15%, SiO 2 5-15%, MgO 5-25 %, CaF 2 Flux for tundish addition in the component range of 0.5-10%. However, this flux is also excellent in basic flux function, that is, preventing flux reoxidation and thermal insulation of molten steel, and is effective in reducing tundish refractory loss. However, the flux of aluminum deoxidized steel has not been greatly improved.
본 발명의 목적은 알루미늄 탈산강을 연속주조하여 제조할 때 턴디쉬 내에 투입되어 턴디쉬 내화물의 용손을 방지하면서도 Al2O3 개재물 흡수능이 월등하여 알루미늄 탈산강의 청정성을 확보할 수 있는 턴디쉬 플럭스를 제공함에 있다.An object of the present invention is to provide a tundish flux that can be injected into the tundish when the aluminum deoxidized steel is continuously cast to prevent the melting of the tundish refractory, while also absorbing Al 2 O 3 inclusions to ensure cleanness of the aluminum deoxidized steel. In providing.
본 발명은 중량%로, CaO: 50~ 60%, Al2O3: 30~ 40%, SiO2: 5%이하, MgO: 1~ 5%, 나머지 불가피한 불순물을 포함하여 조성되고, 상기 CaO/Al2O3의 비가 1.4~ 1.8의 범위인 알루미늄 탈산강 제조용 연속주조 턴디쉬 플럭스에 관한 것이다.The present invention is composed by weight, CaO: 50 to 60%, Al 2 O 3 : 30 to 40%, SiO 2 : 5% or less, MgO: 1 to 5%, the remaining unavoidable impurities, and comprises the CaO / A continuous casting tundish flux for producing aluminum deoxidized steel in which the ratio of Al 2 O 3 is in the range of 1.4 to 1.8.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
본 발명의 플럭스 내에 CaO 성분은 플럭스의 Al2O3 개재물 흡수능을 키우는 기본 골재이다. 플럭스중에 CaO가 50% 미만이면 Al2O3 흡수능이 부족하여 턴디쉬 내 용강의 청정성을 기대할 수 없고, 60% 초과시에는 턴디쉬 플럭스의 용융온도가 상승되어 현재의 용강 온도에서 녹지않아 슬래그화가 어렵다.The CaO component in the flux of the present invention is a basic aggregate that increases the flux of Al 2 O 3 inclusions. If CaO is less than 50% in flux, Al 2 O 3 absorption is insufficient and cleanness of molten steel cannot be expected, and if it exceeds 60%, melting temperature of tundish flux is increased and it is difficult to slag because it does not melt at current molten steel temperature. .
상기 Al2O3는 30% 미만시에는 턴디쉬 댐(dam), 웨어(wair), 쉬라우드 노즐의 용손으로 작업성 확보가 불가하며, 40%초과시에는 Al2O3개재물의 흡수능이 없으므로 용강의 청정화를 도모할 수 없게 되어 바람직하지 않다.When the Al 2 O 3 is less than 30%, it is impossible to secure workability due to the melted damage of the tundish dam, the weir, and the shroud nozzle. When the Al 2 O 3 exceeds 40%, there is no absorption ability of the Al 2 O 3 inclusions. It is unpreferable since the purification | cleaning of cannot be aimed at.
상기 SiO2는 용강중의 Al과 반응하여 재산화되어 Al2O3을 형성하므로 이를 방지하기 위하여 최대한 억제할 필요가 있다. 본 발명의 플럭스에서 SiO2 함량은 가급적 5%이하로 관리하는 것이 필요하다. 그러나, SiO2의 함량이 너무 작으면 플럭스의 고화현상이 일어날 수 있으므로 적어도 3%이상은 유지될 필요가 있다.Since SiO 2 reacts with Al in molten steel to be reoxidized to form Al 2 O 3 , it is necessary to be suppressed as much as possible to prevent this. In the flux of the present invention, the SiO 2 content needs to be managed at 5% or less. However, if the content of SiO 2 is too small, flux solidification may occur, so at least 3% or more needs to be maintained.
상기 MgO는 MgO재질인 턴디쉬 코팅층의 용손이 심화되는 것을 방지하기 위하여 첨가된다. 이를 위해서는 MgO는 플럭스중에 적어도 1% 이상은 첨가되어야 한다. 그러나, 너무 과다할 경우 용융온도 상승으로 미용융 상태의 덩어리가 형성될 수 있으므로 5%를 초과하지 않도록 하는 것이 바람직하다.The MgO is added to prevent deepening of the melt of the tundish coating layer, which is MgO material. For this purpose, MgO must be added at least 1% of the flux. However, if too much, it is preferable not to exceed 5%, because unmelted lumps may be formed due to an increase in melting temperature.
한편, 본 발명의 턴디쉬 플럭스는 용강 내 생성된 Al2O3을 쉽게 포집할 수 있는 슬래그 조성을 만들기 위해서 액상으로 존재하는 영역중에서 Al2O3의 함량이 가장 낮은 영역이어야 한다. 이를 위하여 본 발명의 턴디쉬 플럭스에서는 CaO/Al2O3의 비를 1.4~ 1.8의 범위로 함이 바람직하다. CaO/Al2O3의 비가 1.4미만이면 Al2 O3 흡수능이 미약하고, 1.8 초과하면 슬래그의 고상화에 따른 개재물 흡수가 불가능하다.On the other hand, the tundish flux of the present invention should be the region with the lowest Al 2 O 3 content in the liquid phase in order to make the slag composition that can easily collect the Al 2 O 3 generated in the molten steel. To this end, in the tundish flux of the present invention, the ratio of CaO / Al 2 O 3 is preferably in the range of 1.4 to 1.8. If CaO / Al 2 O 3 ratio is less than 1.4, Al 2 O 3 absorption capacity is weak, and if it exceeds 1.8, inclusion absorption due to solidification of slag is impossible.
이하, 본 발명을 실시예를 통하여 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.
[실시예]EXAMPLE
표1과 같은 조성을 갖는 턴디쉬 플럭스를 알루미늄 탄산강이 유입된 턴디쉬의 상부에 투입하면서 동일한 주조조건에서 강을 연속주조하였다.The tungsten flux having the composition shown in Table 1 was continuously cast on the same casting conditions while the aluminum carbonate steel was introduced into the upper tundish.
표2는 그렇게 연속주조를 할 때 작업성과 강의 품질수준 결과를 보이고 있다.Table 2 shows the results of work performance and quality level of steel when such continuous casting is performed.
표1, 2에 나타난 바와 같이, 본 발명에 의한 턴디쉬 플럭스는 연속주조시, 플럭스의 퍼짐 정도나 화염 분진 발생 정도, 그리고 플럭스의 고화 현상 등 작업성이 우수하면서 턴디쉬 용손을 억제하고, 특히 종래의 턴디쉬 플럭스에 비하여 알루미늄 탈산강 중의 Al2O3 흡수가 매우 큼을 알 수 있었다.As shown in Tables 1 and 2, the tundish flux according to the present invention is excellent in workability such as the spreading degree of the flux, the degree of flame dust generation, and the solidification of the flux during continuous casting, while suppressing the tundish melt loss. Compared with the conventional tundish flux, it was found that Al 2 O 3 absorption in aluminum deoxidized steel was very high.
그러나, 본 발명의 조건 범위를 벗어난 플럭스들은 Al2O3 흡수능이 크게 개선되지 못하고 있으며, Al2O3 흡수능이 개선되더라도 비교재(b)와 같이 작업성이 떨어져 바람직하지 못함을 알 수 있었다.However, the flux out of the condition range of the invention showed that the working efficiency as compared to material (b) even when, and the Al 2 O 3 absorption capacity does not significantly improve, Al 2 O 3 absorption capacity improvement does not preferable away.
상술한 바와 같이, 본 발명에 따른 턴디쉬 플럭스는 알루미늄 탈산강을 연속주조하여 제조할 때 턴디쉬 내에 투입되어 턴디쉬 내화물의 용손을 방지하면서도 Al2O3 개재물 흡수능이 월등하여 알루미늄 탈산강의 청정성을 확보할 수 있어 청정도가 높은 알루미늄 탈상강 제조에 매우 유용하다.As described above, the tundish flux according to the present invention is introduced into the tundish when manufactured by continuous casting of aluminum deoxidized steel, while preventing the melting of the tundish refractory material, while absorbing Al 2 O 3 inclusions, the cleanliness of the aluminum deoxidized steel As it can be secured, it is very useful for manufacturing aluminum dephase steel with high cleanliness.
도1은 일반적인 연속주조기의 개략 구조도이다.1 is a schematic structural diagram of a general continuous casting machine.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on main parts of drawing
1 ..... 턴디쉬 2 ..... 래들 3 ..... 용강1 ..... tundish 2 ..... ladle 3 ..... molten steel
4 ...... 주형4 ...... mold
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| CN110315037B (en) * | 2018-03-29 | 2022-02-22 | 宝山钢铁股份有限公司 | Covering agent for preventing tundish from being damaged by melting and application |
| JP7238275B2 (en) * | 2018-06-11 | 2023-03-14 | 日本製鉄株式会社 | Continuous casting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60258406A (en) * | 1984-06-06 | 1985-12-20 | Nippon Steel Corp | Synthetic flux for molten steel |
| JPH01180764A (en) * | 1987-12-28 | 1989-07-18 | Nippon Steel Corp | Method for continuously casting high clean steel |
| JPH07179929A (en) * | 1993-12-24 | 1995-07-18 | Nkk Corp | Flux to be added into tundish |
| KR970043117A (en) * | 1995-12-23 | 1997-07-26 | 김종진 | Steelmaking Flux |
-
2001
- 2001-08-16 KR KR10-2001-0049210A patent/KR100530053B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60258406A (en) * | 1984-06-06 | 1985-12-20 | Nippon Steel Corp | Synthetic flux for molten steel |
| JPH01180764A (en) * | 1987-12-28 | 1989-07-18 | Nippon Steel Corp | Method for continuously casting high clean steel |
| JPH07179929A (en) * | 1993-12-24 | 1995-07-18 | Nkk Corp | Flux to be added into tundish |
| KR970043117A (en) * | 1995-12-23 | 1997-07-26 | 김종진 | Steelmaking Flux |
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|---|---|
| KR20030015904A (en) | 2003-02-26 |
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