WO2003045608A1 - Procédé de coulée en continu d'acier - Google Patents

Procédé de coulée en continu d'acier Download PDF

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Publication number
WO2003045608A1
WO2003045608A1 PCT/JP2001/010444 JP0110444W WO03045608A1 WO 2003045608 A1 WO2003045608 A1 WO 2003045608A1 JP 0110444 W JP0110444 W JP 0110444W WO 03045608 A1 WO03045608 A1 WO 03045608A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
alumina
immersion nozzle
nozzle
powder
Prior art date
Application number
PCT/JP2001/010444
Other languages
English (en)
Japanese (ja)
Inventor
Osamu Nomura
Akihiro Morita
Shigeki Uchida
Tomoaki Omoto
Wei Lin
Original Assignee
Shinagawa Refractories Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2000174553A priority Critical patent/JP2001353561A/ja
Application filed by Shinagawa Refractories Co., Ltd. filed Critical Shinagawa Refractories Co., Ltd.
Priority to CNA018238440A priority patent/CN1589187A/zh
Priority to KR10-2004-7007511A priority patent/KR20040079407A/ko
Priority to CA002454946A priority patent/CA2454946A1/fr
Priority to AU2002222564A priority patent/AU2002222564A1/en
Priority to EP01274842A priority patent/EP1449603A1/fr
Priority to PCT/JP2001/010444 priority patent/WO2003045608A1/fr
Priority to US10/484,388 priority patent/US20040159419A1/en
Priority to TW090130104A priority patent/TW590823B/zh
Publication of WO2003045608A1 publication Critical patent/WO2003045608A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
    • 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
    • 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

Definitions

  • the present invention relates to a method for continuously producing steel, and particularly to a method for continuously producing steel, in which a refractory material containing a specific mold powder and alumina as main materials (specifically, an alumina-based refractory and / or an alumina-based refractory material).
  • a refractory material containing a specific mold powder and alumina as main materials specifically, an alumina-based refractory and / or an alumina-based refractory material.
  • the present invention relates to a method for continuously producing steel, which is used in combination with an immersion nozzle composed of (carbon-based refractory). Background technology>
  • alumina / graphite-based material containing and / or not containing fused silica is used as the main body material
  • zirconia ⁇ graphite-based material and / or zirconia ⁇ force Lucia ⁇ graphite-based material is powdered.
  • An immersion nozzle as a line material and a mold powder containing a fluorine component are used in combination.
  • low-carbon A1 killed steel, high-oxygen steel, high-Mn steel, stainless steel, Ca-treated steel, and other parts that come into contact with molten steel are made of a refractory material made of spinel, or a refractory material made of spinel and polyclase.
  • an immersion nozzle see Japanese Patent Application Laid-Open No. H10-305355 in which an immersion nozzle is provided, which has both erosion resistance and blocking resistance and suppresses inclusions caused by refractories. "Prior art 2-2").
  • the mold powder usually as a fluxing agent to increase the fluidity, and / or, as it is possible to heat extraction control, Kasupidai emissions (3CaO ⁇ 2Si0 2 ⁇ CaF 2 ) can be generated crystals "Raw materials containing a fluorine component" such as natural fluorite are generally used (hereinafter referred to as "prior art 3").
  • the fluorine component promotes the erosion of the immersion nozzle and indirectly makes the production of clean steel difficult. Therefore, it is necessary to use a mold pad which is free of fluorine or has a reduced fluorine component.
  • the conventional technologies for fluorine-free mold powder include: (1) spray cooling water for one-side cooling, secondary cooling water after cooling, and machine cooling water at neutral pH; Technology aimed at improving the durability of metal structures and concrete equipment (JP-A-58-125349);
  • the inner pipe and the powder line of the immersion nozzle are not immersed in molten steel, inclusions in molten steel, mold powder. First, it is eroded by slag. When melted in this way, the shape of the immersion nozzle changes, and the molten steel flow in the mold is disturbed, causing a piece defect.
  • the immersion nozzle material reacts with the molten elements in the molten steel and / or the mold powder and slag to form low- and high-melting compounds that are formed during production.
  • the thermal conductivity of the immersion nozzle changes. Due to this change in thermal conductivity, the amount of heat extracted from the molten steel through the immersion nozzle was not constant, and as a result, the formation of a solidified shell was not uniform, which caused fragment defects.
  • the flow of inert gas blown out of the nozzle becomes more and more deflected, further contributing to erosion and / or alumina deposition of the nozzle. Then, the nozzle is melted and the steel is contaminated.
  • the conventional technology 2-2 "Immersion nozzle in which a refractory material made of spinel or a refractory material made of spinel and vericlase is disposed in a portion that comes into contact with molten steel" is a commonly used alumina-graphite nozzle.
  • alumina-graphite nozzle is a commonly used alumina-graphite nozzle.
  • an alumina-graphite material generally used as an immersion nozzle material generally causes the following reaction with molten steel, and is an undesirable material for producing clean steel. That is, since the carbon concentration in molten steel is extremely low, the graphite (C (s): solid graphite) in the alumina-graphite nozzle material is
  • the permeation amount of (FeO) and (MnO) into the spinel is small, and the solid phase is maintained without generating a liquid phase even if inclusions such as FeO-MnO adhere. That is, there is little erosion of the nozzle in which the spinel is distributed at the part in contact with the molten steel, and therefore, the molten steel contamination is reduced.
  • the present inventors have found that, by using the specific mold powder, surprisingly, it is not necessary to combine the specific immersion nozzle with the powder. Even when using an immersion nozzle composed of a refractory material mainly composed of alumina, including one line section, it is possible to produce clean steel with almost no erosion and no adherence of alumina. The inventors have found that the present invention can be performed and completed the present invention.
  • an object of the present invention is to prevent contamination of steel due to refractories, to enable stable production of highly clean steel, and to use the same “alumina” as a main material from the viewpoint of manufacturing an immersion nozzle. Therefore, it is an object of the present invention to provide a method for continuously producing steel, which has an operational effect that can be produced extremely easily.
  • the molten steel is supplied into the mold by the immersion nozzle, and the mold powder is contained in the mold.
  • the amount of fluorine is less than 3% by weight and 130.000.
  • a continuous steel making method characterized by using a combination of an immersion nozzle made of a refractory material as a main material.
  • the "fluorine component” was inevitable for reducing the viscosity of the mold powder and controlling the heat removal.
  • the chemical composition of the mold powder used in the present invention A 1 2 0 3: 5 ⁇ 2 5 wt%, S i 0 2: 2 5 ⁇ 7 0 wt%, C a O: 1 0 ⁇ 5 0 wt %, Mg 0: 20% by weight or less, F: 0 to 2% by weight (inevitable impurities) are preferable.
  • the immersion nozzle used in combination with the mold powder is an immersion nozzle composed of a refractory material mainly composed of alumina, specifically, an alumina-based refractory and / or an alumina-carbon type. Made of refractory.
  • the refractory material "silica (Si0 2), silicon carbide (SiC), boron carbide (B 4 C), silicon nitride (Si 3 N 4), nitride ⁇ Ruminiumu (A1N), zirconium boride (ZrB 2) , boride magnesium (Mg 3 B 2), sulfuric acid di Rukoniumu (ZrS0 4), silicon (Si), containing one or more selected from aluminum (A1) "can be used immersion nozzle I found something.
  • FIG. 1 is a diagram showing an example of a immersion nozzle structure of a type having a discharge port used in Examples (including Comparative Examples) of the present invention.
  • FIG. 2 is a view showing another example of the immersion nozzle structure of the type having a discharge port used in Examples (including Comparative Examples) of the present invention.
  • FIG. 3 is a view showing an example of a straight type immersion nozzle having no discharge port used in Examples (including Comparative Examples) of the present invention.
  • 1 denotes the inner pipe of the immersion nozzle that comes into contact with the molten steel
  • 2 denotes the discharge port of the immersion nozzle that comes into contact with the molten steel
  • 3 denotes the line of the immersion nozzle that comes into contact with the mold powder
  • I the main part of the immersion nozzle
  • 5 is the straight type immersion nozzle This is the tip of the nozzle that comes into contact with molten steel.
  • the mold padder used in the present invention has a fluorine content of less than 3% by weight and a viscosity at 1300 ° C. of 4 to 100,000 boise. .
  • the amount of fluorine in the mold powder is 3% by weight or more, the amount of erosion of the immersion nozzle, especially in the powder line, increases, and the refractory material that has flowed into the steel contaminates the molten steel to obtain clean steel. Can not.
  • viscosity of the mold powder (viscosity at 1300 ° C) is less than 4 voids, uneven flow of the mold powder will occur, and in the molten mold powder, such as dicalcium silicate and tricalcium silicate, etc. Undesirably, crystals develop and the temperature fluctuation of the molded copper plate increases, resulting in unstable heat removal.
  • the above viscosity is 10
  • the viscosity for example, A 1 2 0 3, CaO / S i0 can adjust 2 or the like, in the case when A 1 2 0 3 is large and C a 0 / S i 0 2 is low
  • the viscosity can be adjusted higher.
  • the mold powder used in the present invention melts the mold powder, and cuts the mold powder droplets when the platinum cylinder having a diameter of 7 mm is pulled up at a constant speed in the platinum powder when it separates from the liquid surface.
  • the breaking strength of the molten mold powder the breaking strength of the molten mold powder at 1300 ° C is preferably 3.7 g / cm 2 or more. If the breaking strength is less than 3.7 g / cm 2 , the liquid layer in the slag film tends to break, which is not preferable.
  • the mold powder used in the present invention is composed of base materials such as portland cement, wollastonite, and synthetic calcium silicate, and S powders such as perlite and fly ash.
  • a liquid eg, water
  • an organic binder or an inorganic binder are added as required, and the mixture is granulated by a method such as extrusion granulation, stirring granulation, tumbling granulation, fluidized granulation, or spray granulation.
  • granules can also be used.
  • a material constituting the immersion nozzle is a refractory material mainly composed of alumina, and a preferred embodiment is an alumina-based refractory and / or an alumina-carbon refractory.
  • alumina-based refractories alumina - carbon-based refractories, silica (Si0 2), carbonization silicon (SiC), boron carbide (B 4 C), silicon nitride (Si 3 N 4), aluminum nitride (A1N ), zirconium boride (ZrB 2), magnesium boride (Mg 3 B 2), it can also be used those containing one or more selected from zirconium sulfate (ZrS0 4), thus A wide range of materials can be used.
  • silicon (Si), aluminum (A1) Contains one or more.
  • the metal reacts with the refractory material and / or the components in the air, particularly in the powder line portion of the immersion nozzle, at a high temperature during use to generate a metal reactant.
  • This metal reactant strengthens the powder line and contributes to improved durability.
  • the powder line portion contains carbon, the metal also functions as an antioxidant for carbon.
  • an excellent immersion nozzle can be provided by blending the above metal.
  • the content of silicon (Si) and aluminum (A1) is preferably 0.1 to 15% by weight, and more preferably 1 to 8% by weight. If the content is less than 0.1% by weight, the above-mentioned effect of the metal cannot be obtained.
  • the content exceeds 15% by weight, a large amount of metal reactant is generated, so that the refractory structure due to the volume increase is produced. This leads to the destruction of steel and loss of the effect of the refractory material of the main aggregate, which is not preferable.
  • the same material can be used for the powder line portion and the main body portion of the immersion nozzle. The reason for this is that the specific mold powder of the present invention (mold powder having a fluorine content of less than 3% by weight and a viscosity at 1300 ° C. of 4 to 1000 vise) is used. is there.
  • FIG. 1 is a diagram showing an example of an immersion nozzle structure having a discharge port
  • FIG. 2 is a diagram showing another example of a immersion nozzle structure having a discharge port
  • FIG. 3 is a view showing an example of a straight type immersion nozzle having no discharge port.
  • the immersion nozzle shown in Fig. 1 is a type of immersion nozzle that has a discharge port.
  • 1 is the inner tube of the immersion nozzle that comes into contact with molten steel
  • 2 is the immersion nozzle that also contacts the molten steel.
  • the discharge port portion 3 is a powder line portion that comes into contact with the mold powder and / or slag
  • the reference numeral 4 is a main portion of the immersion nozzle.
  • this immersion nozzle is a immersion nozzle having a structure in which the discharge port 2a of the immersion nozzle that comes into contact with the molten steel has the body 4 and the discharge port 2 integrated integrally.
  • the immersion nozzle shown in FIG. 2 is a type of immersion nozzle having a discharge port like the immersion nozzle shown in FIG. However, it does not have an integrated structure as shown in Fig. 1 (see “Part 2a” in Fig. 1), and as shown in Fig. 2, the discharge port 2b of the immersion nozzle that comes into contact with molten steel.
  • This is an immersion nozzle having a structure in which the portion of the nozzle is formed as a discharge port 2 made of the same material.
  • Reference numerals 1 to 4 in FIG. 2 are the same as above, 1 is an inner tube portion, 2 is a discharge port portion, 3 is a powder line portion, and 4 is a main body portion.
  • the immersion nozzle shown in FIG. 3 is a straight type immersion nozzle having no discharge port.
  • Reference numeral 5 in FIG. 3 denotes a nozzle tip portion that comes into contact with molten steel, and other symbols are the same as those described above, where 1 is an inner tube portion, 3 is a powder line portion, and 4 is a main body portion.
  • Table 1 shows the chemical composition of the mold powder (sample numbers 1 to 7) used in the following examples, and Table 2 shows the chemical composition of the mold powder for comparison (sample numbers 8 to 21). Shown in Tables 1 and 2 also show the “fluorine component”, “viscosity (at 1300 ° C), and“ breaking strength (at 1300 ° C) ”of each mold powder.
  • the mold powders of Sample Nos. 1 to 7, 8 to 10 and 13 to 17 in Tables 1 and 2 were obtained by mixing powders having a predetermined chemical composition ratio using a mixer. Goods ".
  • a solution consisting of 90% by weight of water and 10% by weight of sodium silicate was mixed with 20 to 30% by weight. It is a "granule” obtained by adding the slurry to produce a slurry, spray-granulating the slurry, and drying the slurry, which is finally prepared to have a predetermined chemical composition.
  • Examples 1 to 17 are shown in Tables 3 and 4, and Comparative Examples 1 to 6 are shown in Table 5.
  • molten steel (“steel type” in the table) was supplied into a mold by a nozzle, and The continuous production was performed while supplying mold powder to the plant.
  • the structure of the nozzle used in each example is indicated by the drawing number in the table.
  • the mold powder used in each example was composed of those having the chemical compositions of Sample Nos. 1 to 21 in Tables 1 and 2 above. The sample numbers are shown in the table, and the mold powder used was used. Only the "fluorine component", “viscosity (at 1300 ° C)" and “breaking strength (at 1300 ° C)" of "No. of materials for each nozzle site” in the table indicate "% by weight".
  • “stable structure”, “nozzle erosion amount or alumina adhesion amount (each erosion amount of inner tube, discharge port inside, powder line)”, “steel cleanliness” and “steel defect rate” are as follows. Table 3 to Table 5 show the evaluation results.
  • Solid structure indicates whether a stable structure is possible or not.
  • a BO prediction warning [A system that predicts the occurrence of B.O. (break fault) by continuous measurement of the mold surface temperature. No evaluation method when using a stem]
  • Nozzle erosion amount [mm / (steel ton)] is shown as nozzle erosion size per ton of forged volume. The greater the amount of nozzle erosion, the shorter the life of the nozzle, and the more impurities that are eroded into the steel, thus contaminating the steel.
  • Step cleanliness was evaluated based on the degree of sliver scratch.
  • the index “100” indicates the case where there is no sliver flaw, and the index “0” indicates the case where the steel does not become a product due to the slipper flaw.
  • Step defect rate was evaluated by surface cracking. " ⁇ ” indicates that the surface cracking was negligible, “ ⁇ ” indicates that the steel did not turn into a product due to surface cracking, and “ ⁇ ” indicates that the steel surface could be processed into a product.
  • Breaking strength (at 1300 ° C) (g / cm 2 ) 5.0 5.0 5.0 3.7 5.0 Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum
  • Nozzle part Material structure (Fig. 1) (Fig. 2) (Fig. 2) (Fig. 2) (Fig. 2) (Fig. 2) (Fig. 2) (Fig. 1) (Fig. 1) Inner pipe Al 2 0 3 100 100 100 70 80 80 100
  • Example 1 or using an immersion nozzle made of an alumina-based refractory (Example 12), that is, using a refractory of the same quality
  • the evaluations were all "OK", indicating that a stable structure was possible. Further, as can be seen from Examples 1 to 17, it was also found that a stable structure could be similarly obtained by using the same material for both the powder line portion and the main body portion.
  • nozzle erosion amount or alumina adhesion is all "0”
  • steel purity is “100”
  • steel defect rate is all “ ⁇ ”. The surface cracks of the steel were negligible.
  • the present invention relates to a continuous steel pipe using a combination of a mold powder in which a fluorine component having high erosion properties is substantially absent and a dipping nozzle composed of a refractory material mainly composed of alumina. It is characterized by a fabrication method.
  • the immersion nozzle used in the present invention has almost no erosion, so that the nozzle life can be improved, and high performance and low cost can be achieved by thinning and weight reduction.
  • aluminum-killed steel, silicon-killed steel, high-oxygen steel, stainless steel, steel for electrical steel sheets, calcium-treated steel, high-manganese steel, free-cutting steel, boron steel, steel cord, case-hardened steel It can be applied to all types of steel, such as high titanium steel, and has an extremely high industrial value.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Continuous Casting (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

L'invention concerne un procédé de coulée en continu d'acier caractérisé en ce qu'il consiste à utiliser une combinaison comprenant une poudre de lingotière possédant une teneur en fluorine inférieure à 3 % en poids et présentant une viscosité à 1300 °C comprise entre 4 à 10'000 poises, ainsi qu'une buse d'immersion comprenant un matériau réfractaire renfermant de l'alumine comme composant principal (notamment, un matériau réfractaire à base d'alumine et/ou d'alumine-carbone). Le procédé permet d'obtenir une production stable de produit en acier coulé propre avec une faible perte au feu et sans dépôt d'alumine, même dans le cas où on utilise une buse d'immersion renfermant un matériau réfractaire comprenant de l'alumine comme composant principal.
PCT/JP2001/010444 2001-11-29 2001-11-29 Procédé de coulée en continu d'acier WO2003045608A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP2000174553A JP2001353561A (ja) 2001-11-29 2000-06-09 鋼の連続鋳造方法
CNA018238440A CN1589187A (zh) 2001-11-29 2001-11-29 连续铸造钢的方法
KR10-2004-7007511A KR20040079407A (ko) 2001-11-29 2001-11-29 강의 연속 주조 방법
CA002454946A CA2454946A1 (fr) 2001-11-29 2001-11-29 Procede de coulee en continu d'acier
AU2002222564A AU2002222564A1 (en) 2001-11-29 2001-11-29 Method for continuous casting of steel
EP01274842A EP1449603A1 (fr) 2001-11-29 2001-11-29 Proc d de coul e en continu d'acier
PCT/JP2001/010444 WO2003045608A1 (fr) 2001-11-29 2001-11-29 Procédé de coulée en continu d'acier
US10/484,388 US20040159419A1 (en) 2001-11-29 2001-11-29 Method of continuous casting of steel
TW090130104A TW590823B (en) 2001-11-29 2001-12-05 Method for continuously casting steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/010444 WO2003045608A1 (fr) 2001-11-29 2001-11-29 Procédé de coulée en continu d'acier

Publications (1)

Publication Number Publication Date
WO2003045608A1 true WO2003045608A1 (fr) 2003-06-05

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PCT/JP2001/010444 WO2003045608A1 (fr) 2001-11-29 2001-11-29 Procédé de coulée en continu d'acier

Country Status (9)

Country Link
US (1) US20040159419A1 (fr)
EP (1) EP1449603A1 (fr)
JP (1) JP2001353561A (fr)
KR (1) KR20040079407A (fr)
CN (1) CN1589187A (fr)
AU (1) AU2002222564A1 (fr)
CA (1) CA2454946A1 (fr)
TW (1) TW590823B (fr)
WO (1) WO2003045608A1 (fr)

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US8396524B2 (en) 2006-09-27 2013-03-12 Covidien Lp Medical sensor and technique for using the same
US8420405B2 (en) 2006-09-25 2013-04-16 Covidien Lp Carbon dioxide detector having borosilicate substrate
US8431088B2 (en) 2006-09-25 2013-04-30 Covidien Lp Carbon dioxide detector having borosilicate substrate
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JP5564496B2 (ja) * 2009-05-27 2014-07-30 新日鐵住金株式会社 鋼の連続鋳造方法及び鋼の連続鋳造で使用される耐火物
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KR101825132B1 (ko) * 2016-04-29 2018-02-02 주식회사 포스코 플럭스 및 이를 이용한 주조 방법
CN109277558B (zh) * 2018-10-24 2020-08-07 芜湖新兴铸管有限责任公司 防结瘤浸入式水口和防结瘤施工方法
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JP6871525B2 (ja) * 2020-06-12 2021-05-12 品川リフラクトリーズ株式会社 モールドパウダー

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Publication number Priority date Publication date Assignee Title
US7992561B2 (en) 2006-09-25 2011-08-09 Nellcor Puritan Bennett Llc Carbon dioxide-sensing airway products and technique for using the same
US8128574B2 (en) 2006-09-25 2012-03-06 Nellcor Puritan Bennett Llc Carbon dioxide-sensing airway products and technique for using the same
US8420405B2 (en) 2006-09-25 2013-04-16 Covidien Lp Carbon dioxide detector having borosilicate substrate
US8431088B2 (en) 2006-09-25 2013-04-30 Covidien Lp Carbon dioxide detector having borosilicate substrate
US8449834B2 (en) 2006-09-25 2013-05-28 Covidien Lp Carbon dioxide detector having borosilicate substrate
US8454526B2 (en) 2006-09-25 2013-06-04 Covidien Lp Carbon dioxide-sensing airway products and technique for using the same
US8396524B2 (en) 2006-09-27 2013-03-12 Covidien Lp Medical sensor and technique for using the same
US8234357B2 (en) 2007-10-01 2012-07-31 Endress + Hauser Process Solutions Ag Method for servicing field devices of process automation technology utilizing a device-independent operating program

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JP2001353561A (ja) 2001-12-25
CA2454946A1 (fr) 2003-06-05
TW590823B (en) 2004-06-11
US20040159419A1 (en) 2004-08-19
KR20040079407A (ko) 2004-09-14
EP1449603A1 (fr) 2004-08-25
CN1589187A (zh) 2005-03-02

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