KR20060073340A - Mold powder for slag bear prevention of stainless steel bloom by continuous casting - Google Patents
Mold powder for slag bear prevention of stainless steel bloom by continuous casting Download PDFInfo
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- KR20060073340A KR20060073340A KR1020040112544A KR20040112544A KR20060073340A KR 20060073340 A KR20060073340 A KR 20060073340A KR 1020040112544 A KR1020040112544 A KR 1020040112544A KR 20040112544 A KR20040112544 A KR 20040112544A KR 20060073340 A KR20060073340 A KR 20060073340A
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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
- B22D11/07—Lubricating the moulds
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/002—Stainless steels
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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
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
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Abstract
본 발명은 스테인레스 불룸 연속주조시에 사용하는 몰드파우더가 몰드 주위에 엉킴 현상을 일으킴으로써 정상적인 연속주조를 어렵게 만드는 슬래그베어 현상을 방지하도록 하는 몰드파우더에 관한 것으로서, 이는 몰드파우더의 소모량을 적정하게 유지하기 위하여 점도를 약간 상향하기 위해 불소(F) 량을 줄이고, Al2O3 량은 약간 늘렸으며, 특히 몰드파우더내의 용융층 두께가 얇아서 몰드표면층의 온도가 떨어져 슬래그베어 현상의 원인을 제공하므로 용융층의 두께를 충분하게 확보한다는 의미에서 CO2 량을 대폭 첨가하여 된 것이다.The present invention relates to a mold powder to prevent the slag bear phenomenon, which makes the continuous continuous casting difficult by causing the mold powder used in the continuous continuous casting of stainless bloom, which is entangled around the mold, which maintains the consumption of the mold powder properly In order to increase the viscosity slightly, the amount of fluorine (F) was reduced, and the amount of Al 2 O 3 was slightly increased. In particular, the thickness of the molten layer in the mold powder was thin, so that the temperature of the mold surface layer dropped, which caused the slag bear phenomenon. In the sense of sufficiently securing the thickness of the layer, a large amount of CO 2 was added.
연속주조, 스테인레스 불룸, 몰드파우더, 슬래그베어 Continuous casting, stainless bloom, mold powder, slag bearing
Description
도1은 종래 몰드파우더를 사용한 표면층 사진 Figure 1 is a photograph of the surface layer using a conventional mold powder
도2는 본 발명의 몰드파우더를 사용한 표면층 사진 Figure 2 is a photograph of the surface layer using the mold powder of the present invention
본 발명은 스테인레스 불룸 연속주조시에 사용하는 몰드파우더(mold powder)가 몰드 주위에 엉킴 현상을 일으킴으로써 정상적인 연속주조를 어렵게 만드는 슬래그베어(slag bear)현상을 방지하도록 하는 몰드파우더에 관한 것이다.The present invention relates to a mold powder for preventing a slag bear phenomenon, which makes it difficult to normal continuous casting by causing mold powder to be entangled around the mold when used in continuous casting of stainless bloom.
스테인레스 불룸은 전기로에서 고철을 용해하여 일정한 용량의 형틀(ingot)에 각각 부어 주조하거나 연속조업 공정으로 주조하여 생산하는 것으로, 상기 연속주조 공정으로 제조되는 스테인레스 불룸은 표면결함 발생을 방지하기 위해 강종에 따라서 다양한 조성을 갖는 몰드파우더를 사용한다.Stainless blooms are produced by melting the scrap metal in an electric furnace and pouring them into molds of a certain capacity, respectively, or casting them in a continuous operation process. The stainless blooms produced by the continuous casting process are used to prevent surface defects. Therefore, mold powders having various compositions are used.
종래의 연속주조용 스테인레스 불룸의 슬래그베어 방지용 몰드파우더 조성은 하기 표1에 나타낸 바와 같다.The slag bear prevention mold powder composition of the conventional continuous casting stainless bloom is shown in Table 1 below.
〔표1〕Table 1
상기 표1과 같은 조성비를 갖는 몰드파우더는 분말형태의 몰드파우더로써, 연속주조시 스테인레스 불룸의 몰드 표면에 불 균일 응고가 일어나서 원활한 윤활 작용을 방해한다. 이에 따라 주조조업이 중단되는 브렉아웃(break-out)을 일으키기도 한다. The mold powder having a composition ratio as shown in Table 1 is a powder powder mold powder, which causes uneven solidification on the mold surface of the stainless bloom during continuous casting, thereby preventing smooth lubrication. This causes break-out in which the casting operation is interrupted.
상기 연속주조 조업시에 몰드파우더의 조성이 불 균일하거나 적절하지 못한 조성을 사용하면 그 물성은 변화하며 점도는 증가하거나 감소하게 된다. If the composition of the mold powder is uneven or inappropriate in the continuous casting operation, its physical properties will change and the viscosity will increase or decrease.
상기 몰드파우더 점도가 감소하게 되면 몰드파우더 소모량은 점차 늘어나게되어 바람직하지 않다. 그리고, 점도가 증가하게 되면 소모량은 줄어들어서 경제성은 좋으나 초기 주조시 몰드와 용강의 윤활이 원활하지 못하므로 이 역시 바람직하지 않다. 보다 심하면 용강이 몰드내를 이탈하여 브렉아웃을 일으켜 대형 주조사고 를 일으킬 수 있는 가능성도 있다. When the mold powder viscosity is decreased, mold powder consumption is gradually increased, which is undesirable. In addition, when the viscosity is increased, the consumption is reduced and the economical efficiency is good, but this is also not preferable because the lubrication of the mold and molten steel during the initial casting is not smooth. Worse, there is a possibility that molten steel can break out of the mold, causing a breakout and causing a large casting accident.
본 발명은 상기의 문제점을 해소하고자 발명한 것으로서, 그 목적은 종래 사용하던 스테인레스 불룸 제거용 몰드파우더 조성을 변화시켜 연속주조시에 사용함으로써 종래 빈번히 발생하는 슬래그베어 현상을 방지하여 스테인레스 불룸의 연속주조 조업이 원활히 진행될 뿐만 아니라 향상된 생산성을 확보하고자 하는데 있다.The present invention has been invented to solve the above problems, and its purpose is to change the composition of the mold mold for removing the stainless boom, which is used in continuous casting, to prevent the slag bearing phenomenon that occurs frequently in the continuous casting operation of the stainless boom. This not only goes smoothly, but also aims to ensure improved productivity.
상기 목적을 달성하기 위한 본 발명에 따른 연속주조용 스테인레스 불룸의 슬래그베어 방지용 몰드파우더 조성비는 하기 표2와 같다.To achieve the above object, the slag bear prevention mold powder composition ratio of the continuous casting stainless bloom according to the present invention is shown in Table 2 below.
〔표2〕 Table 2
몰드파우더를 사용하는데 있어 중요한 것은 몰드파우더의 물성이다. 물성은 몰드파우더의 화학조성에 따라서 달라지는데, 점도, 염기도 및 결정화온도 등을 낮추거나 높일 수 있으며, 그에 따라 몰드파우더의 물성이 달라진다. 예를 들면 불소(F), Li2O, B2O3 등은 점도와 결정화온도를 저하시킨다. The important thing in using a mold powder is the physical properties of the mold powder. The physical properties vary depending on the chemical composition of the mold powder, which can lower or increase the viscosity, basicity, and crystallization temperature, and thus the physical properties of the mold powder are changed. For example, fluorine (F), Li 2 O, B 2 O 3 and the like lower the viscosity and the crystallization temperature.
Al2O3는 점도를 증가시키지만 결정화온도를 낮추는 양면성이 있으므로 적정 사용조성은 6~9중량% 내외가 된다. MgO는 첨가시 점도 및 결정화온도를 저하시키나, 8중량% 이상인 경우 둘다 증가시킨다. 이와 같이 몰드파우더의 물성이 변화하면 몰드파우더의 작용이 원활하지 못하여 슬래그베어 현상을 일으키는 원인이 된다.Al 2 O 3 increases the viscosity but lowers the crystallization temperature, so the proper composition is about 6-9 wt%. MgO lowers the viscosity and crystallization temperature upon addition, but increases both above 8% by weight. As such, when the physical properties of the mold powder are changed, the function of the mold powder is not smooth and causes a slag bear phenomenon.
따라서, 주조초기부터 말기까지 몰드파우더의 물성이 일정하게 유지하는 것이 그 무엇보다 중요함은 물론, 적절한 물성관리 및 유지가 필수적으로 요구된다.Therefore, it is important to keep the physical properties of the mold powder constant from the beginning to the end of the casting, as well as proper physical property management and maintenance is essential.
이하 본 발명을 실시예를 들어 상세하게 설명하면 다음과 같다. Hereinafter, the present invention will be described in detail with reference to Examples.
〔실시예〕 EXAMPLE
상기 표2와 같은 몰드파우더는 종래 몰드파우더 대비 몰드내에서의 슬래그베어 현상을 현저히 감소시킨 개선된 몰드파우더의 조성 및 주요물성에 대하여 나타낸 것이다.The mold powder as shown in Table 2 shows the composition and the main physical properties of the improved mold powder which significantly reduced the slag bearing phenomenon in the mold compared to the conventional mold powder.
본 발명은 몰드파우더의 소모량을 적정하게 유지하기 위하여 점도를 약간 상향하기 위해 불소(F) 량을 줄이고, Al2O3 량은 약간 늘렸다. 따라서 염기도는 약간 상승하였으며 나머지 성분들은 유사하거나 동등한 수준으로 유지시켰다. The present invention reduces the amount of fluorine (F) to slightly increase the viscosity in order to maintain the consumption of the mold powder appropriately, and slightly increases the amount of Al 2 O 3 . Thus, the basicity slightly increased and the remaining components were kept at similar or equivalent levels.
특히 본 발명의 핵심인 CO2 첨가에 대해 설명하면, 종래 몰드파우더내의 용융층 두께가 얇아서 몰드 표면층의 온도가 떨어져서 슬래그베어 현상의 원인을 제공하므로 용융층의 두께를 충분하게 확보(10∼15mm)한다는 의미에서 CO2 량을 대폭 첨가하였다.Particularly, when CO 2 addition, which is the core of the present invention, is described, the thickness of the molten layer in the conventional mold powder is thin, and thus the temperature of the mold surface layer drops, thereby providing a cause of the slag bear phenomenon, thereby sufficiently securing the thickness of the molten layer (10 to 15 mm). CO 2 amount was added significantly in the sense.
상기 CO2가 첨가됨으로써 Free carbon 량도 상향조정하였다. 이는 종래의 몰드파우더 조성과 달리 첨가된 CO2가 몰드파우더내의 탄소(C)와 반응하여 발열반응을 일으키므로 몰드파우더의 용융층 온도를 올릴뿐만 아니라 용융층의 적정두께를 유지하는데 큰 도움을 준다.The amount of free carbon was also adjusted upward by adding CO 2 . Unlike the conventional mold powder composition, the added CO 2 reacts with the carbon (C) in the mold powder to generate an exothermic reaction, which not only raises the melt layer temperature of the mold powder but also helps to maintain the proper thickness of the melt layer. .
그리고, 몰드표면층의 온도를 적절히 유지함으로써, 몰드표면층에서의 슬래그 엉김현상 즉, 슬래그베어 현상을 조기에 방지할 수 있다.By appropriately maintaining the temperature of the mold surface layer, it is possible to prevent slag entanglement, that is, slag bear phenomenon, in the mold surface layer at an early stage.
도1은 종래 몰드파우더를 사용한 표면층 사진이고, 도2는 본 발명의 몰드파우더를 사용한 표면층 사진으로서, 상기 사진에서 보면 도1에서는 표면층의 온도 및 밝기가 낮아서 슬래그베어가 발생하기 쉬운 반면 도2에서는 첨가한 CO2의 영향으로 종래 대비 개선된 몰드파우더의 표면층에서 탄소와의 반응으로 발열반응이 일어남으로 표면층의 온도 및 밝기가 상대적으로 높은 상태임을 알 수 있는데, 이는 첨가한 CO2가 몰드표면층에서 빈번한 화염을 가지는 것으로도 잘 설명될 수 있다.Figure 1 is a surface layer photograph using a conventional mold powder, Figure 2 is a surface layer photograph using a mold powder of the present invention, as seen in the above picture in Figure 1, the surface layer is low temperature and brightness is easy to generate slag while in Figure 2 There temperature and brightness of the surface layer by the exothermic reaction occurs by reaction with the carbon in the surface layer of the improved mold powder prior compared to the influence of the CO 2 addition was found that the relatively high state, which is added CO 2 is in the mold surface layer It can also be explained well by having frequent flames.
이상에서 설명한 바와 같이 본 발명의 몰드파우더를 연속주조한 스테인레스 불룸에 적용한 결과 종래 몰드파우더 사용대비 점도를 동등이상 수준으로 유지하면서도 슬래그베어 발생현상이 대폭 줄어들어 보다 향상된 생산성을 확보할 수 있었다.As described above, as a result of applying the mold powder of the present invention to the continuously cast stainless lumber, the slag bearing occurrence was significantly reduced while maintaining the viscosity at an equivalent level or higher than that of the conventional mold powder, thereby improving productivity.
특히, 본 발명에서는 종래 대비 점도를 저하시키지 않고 오히려 동등이상으로 유지하면서 슬래그베어 현상을 제어할 수 있었는데 이는 소모량을 적절히 유지하면서도 윤활성도 충분히 확보함으로써 일석이조의 효과를 얻을 수 있다.
In particular, the present invention was able to control the slag bear phenomenon while maintaining the viscosity rather than lower than the conventional compared to the conventional viscosity, which can achieve the effect of one stone two tanks by adequately maintaining the consumption amount and sufficient lubricity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620598A (en) * | 2020-12-16 | 2021-04-09 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for sorbite stainless steel and application thereof |
| CN113798459A (en) * | 2021-10-26 | 2021-12-17 | 西峡龙成冶金材料有限公司 | Special 200-series J5 austenitic stainless steel casting powder for continuous casting and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620598A (en) * | 2020-12-16 | 2021-04-09 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for sorbite stainless steel and application thereof |
| CN112620598B (en) * | 2020-12-16 | 2022-02-11 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for sorbite stainless steel and application thereof |
| CN113798459A (en) * | 2021-10-26 | 2021-12-17 | 西峡龙成冶金材料有限公司 | Special 200-series J5 austenitic stainless steel casting powder for continuous casting and application thereof |
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