EP0846514A1 - Ausguss für den Einsatz im Stahl-Strangguss - Google Patents

Ausguss für den Einsatz im Stahl-Strangguss Download PDF

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Publication number
EP0846514A1
EP0846514A1 EP97118925A EP97118925A EP0846514A1 EP 0846514 A1 EP0846514 A1 EP 0846514A1 EP 97118925 A EP97118925 A EP 97118925A EP 97118925 A EP97118925 A EP 97118925A EP 0846514 A1 EP0846514 A1 EP 0846514A1
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EP
European Patent Office
Prior art keywords
matter
continuous casting
roseki
nozzle
alumina
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP97118925A
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English (en)
French (fr)
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EP0846514B1 (de
Inventor
Toshiyuki Muroi
Shojiro Naito
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Akechi Ceramics Co Ltd
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Akechi Ceramics Co Ltd
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Publication date
Application filed by Akechi Ceramics Co Ltd filed Critical Akechi Ceramics Co Ltd
Publication of EP0846514A1 publication Critical patent/EP0846514A1/de
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Publication of EP0846514B1 publication Critical patent/EP0846514B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a continuous casting nozzle for permitting effective prevention of narrowing, clogging of the nozzle bore or metal sticking to the nozzle bore through which molten steel passes in performing continuous casting of the molten steel containing aluminum such as aluminum-killed steel.
  • a continuous casting nozzle for casting molten steel is used for the following purposes.
  • a continuous casting nozzle is used for such purpose of preventing the molten steel from being oxidized by contacting with the open air and from splashing when the molten steel is poured from a tundish to a mold, and rectifying the flow of the molten steel poured for preventing non-metallic inclusion and slag present near or on the mold surface from being entrapped in the cast steel strand.
  • Material of a conventional continuous casting nozzle of molten steel comprises such material as graphite, alumina, silica, silicon carbide and recently zirconia.
  • the aluminum-killed steel and the like aluminum, which is added as a deoxidizer, reacts with oxygen existing in the molten steel to produce non-metallic inclusion such as ⁇ -alumina. Therefore, in casting the aluminum-killed steel and the like, the non-metallic inclusion such as ⁇ -alumina adheres and accumulates onto the surface of the bore of the continuous casting nozzle, so that the bore is narrowed or clogged up in the worst case, which makes stable casting to be difficult. Furthermore, the non-metallic inclusion such as ⁇ -alumina adhered or accumulated onto the surface of the bore peels off or falls down, and is entrapped in the cast steel strand, thus degrading the quality of the cast steel strand.
  • a large amount of the ejected inert gas causes entrapment of bubbles produced by the inert gas into the cast steel strand, resulting in defects based on pinholes.
  • a small amount of the ejected inert gas causes adhesion and accumulation of the non-metallic inclusion such as ⁇ -alumina onto the surface of the bore of the nozzle, thus causing narrowing or clogging, in the worst case, of the bore.
  • a nozzle in which a non-oxide raw material (SiC, Si 3 N 4 , BN, ZrB 2 , SIALON etc.) that has low reactivity with aluminum oxide is added to alumina-graphite or a nozzle consisting of the non-oxide material itself is proposed (for example, Japanese Patent Publication No. Sho 61-38158/1986).
  • this counterplan is not practical in the case of the alumina-graphite nozzle because the adhesion preventing effect is not recognized and further corrosion resistance is decreased unless much of the non-oxide material is added.
  • the nozzle consists of only the non-oxide material is not suitable for practical use in view of material cost and manufacturing cost, although a substantial effect is expected.
  • a nozzle consisting of graphite-oxide raw material containing CaO is proposed for producing low-melting-point material by a reaction of CaO in an oxide raw material containing CaO (CaO ⁇ ZrO 2 , CaO ⁇ SiO 2 , 2CaO ⁇ SiO 2 etc.) with Al 2 O 3 and forming the low-melting-point material in the steel (for example, Japanese Patent Laid-Open Publication No. Sho 62-56101/1987).
  • reactivity of CaO with Al 2 O 3 is apt to be influenced by a temperature condition of the molten steel in casting, and there is a case that amount of CaO is not sufficiently secured for satisfying spalling resistance and corrosion resistance when plenty of Al 2 O 3 inclusion is contained in the steel.
  • the object of the present invention is to provide a continuous casting nozzle having features of forming a glass layer at the surface of the bore of the nozzle when the nozzle is used, thereby preventing air from being entrapped through refractory structure, smoothing the bore surface of the nozzle and preventing the accumulation of alumina. Also, the object of the present invention is to provide a continuous casting nozzle which prevents erosion by products having a low-melting point on account of a reaction between an aggregate in a refractory and alumina in the steel, and to provide the nozzle which is not influenced by a temperature of the molten steel in casting, and which is able to prevent the bore from narrowing or clogging economically, comparatively easy and stable.
  • the surface layer of the bore of a continuous casting nozzle contacting with molten steel is formed of a refractory comprising graphite from 10 to 35 wt%, an aggregate of 10 to 60 wt% selected from from alumina matter, zirconia matter, zircon matter, or alumina-silica matter and roseki containing the pyrophyllite (Al 2 O 3 ⁇ 4SiO 2 ⁇ H 2 O) as the main component as the rest part of the above mentioned materials.
  • the surface layer of the bore of a continuous casting nozzle contacting with molten steel is formed of a refractory comprising graphite from 10 to 35 wt%, an aggregate of 10 to 60 wt% selected from from alumina matter, zirconia matter, zircon matter, or alumina-silica matter and roseki containing the pyrophyllite (Al 2 O 3 ⁇ 4SiO 2 ⁇ H 2 O) as the main component as the rest part of the above mentioned materials, the said refractory being added binder, kneaded, formed, and sintered in the anti-oxidizing atmosphere.
  • a refractory comprising graphite from 10 to 35 wt%, an aggregate of 10 to 60 wt% selected from from alumina matter, zirconia matter, zircon matter, or alumina-silica matter and roseki containing the pyrophyllite (Al 2 O 3 ⁇ 4SiO 2 ⁇ H 2 O) as the main component as the rest part of
  • the roseki containing the pyrophyllite as the main component is calcinated at a temperature equal to or more than 800°C so as to vanish crystal water and contain alkaline component from 1 to 5 wt%.
  • a mixing weight ratio of roseki with an average grain diameter equal to or less than 250 ⁇ m is equal to or less than 60% relative to the whole of the roseki content.
  • the roseki containing the pyrophyllite as the main component is calcinated at a temperature equal to or more than 800°C so as to vanish crystal water and contains alkaline component from 1 to 5 wt %.
  • a thermosetting resin for example, phenol resin is preferable selected.
  • CIP Cold isostatic process
  • FIG. 1 shows a longitudinal cross section of a nozzle according to the present invention comprising a invented refractory at the surface layer of the bore of the nozzle.
  • FIG. 2 shows a longitudinal cross section of a nozzle according to the present invention comprising a invented refractory at the surface layer of the bore of the nozzle and the lower part (a part immersed in the molten steel) of the nozzle.
  • a major characteristic of a continuous casting nozzle of the present invention is that the main component of a refractory of the surface layer of the bore of the nozzle is roseki.
  • decomposition of the silica produces SiO(g) and CO(g), which react with aluminum in the steel to form Al 2 O 3 and it becomes the source of oxygen to the steel.
  • the roseki particles do not decompose even if it is coexisting with graphite or carbon, namely SiO 2 in pyrophyllite (Al 2 O 3 ⁇ 4SiO 2 ⁇ H 2 O) which is the main mineral of the roseki is stable.
  • SiO 2 in pyrophyllite Al 2 O 3 ⁇ 4SiO 2 ⁇ H 2 O
  • This fact is found from the facts that the particles do not decay and bubbles are not produced, which is confirmed by means of a microscope observation after forming a briquette consisting of the roseki, resin powders and carbon powders and performing heat-treatment at a temperature of 1500°C for 24 hours with burying it in a coke breeze.
  • the half-melting temperature of the roseki is about 1500°C, so that it melts at the bore surface contacting with the molten steel to form a glass coat for smoothing the structure of the surface of the bore and for preventing air from being entrapped through a refractory structure.
  • a mixing weight ratio of the roseki is equal to or more than 30 wt% in order to actively form the glass coat on the surface of the bore in use as continuous casting nozzle, preferably. Also, it is preferably that the mixing weight ratio of the roseki is equal to or less than 80 wt% because degree of softening deformation is large with a range of over 80 wt%.
  • the most preferable mixing weight ratio of the roseki is from 30 wt% to 60 wt%. In this case the aggregate of roseki particles does not decompose even coexisting with graphite.
  • roseki As for kinds of roseki, it is possible to use three kinds of roseki, that is pyrophyllite matter roseki, kaolin matter roseki, and sericite matter roseki.
  • the pyrophyllite matter roseki with refractoriness from SK29 to SK32 (SK(Seger cone) is a Japanese Standard for refractoriness ) is suitable, considering formation of a glass layer and erosion resistance against the molten steel, as the surface of the bore contacting with the molten steel is half-molten in use.
  • Both of the kaolin matter roseki and the sericite matter roseki is not preferable because the kaolin matter roseki has a greater refractoriness from SK33 to SK36, and the sericite matter roseki has a smaller refractoriness from SK26 to SK29.
  • thermosetting resin for example phenol resin
  • the mixing ratio is preferably 5 to 15 wt%.
  • the most preferable process of the mixed material is CIP(cold isostatic pressing) to produce the nozzle having a high heat resistance.
  • Sintering of the formed body is preferably performed in the nonoxidizing atmosphere to minimize the burning loss of the graphite mixed in the material, which is mixed to enhance the erosion resistance and oxidation resistance and the sintering temperature is preferably 1000 to 1200 °C to obtain a sufficient strength of the nozzle.
  • the reason for using the roseki calcinated at a temperature equal to or more than 800°C to vanish crystal water is that the crystal water is released from the roseki at a temperature in a range of from 500 to 800°C in sintering and the refractory cracks by virtue of an unusually large coefficient of thermal expansion in this range.
  • the alkaline component of the roseki from 1 to 5 wt% is preferable to control the melting point of roseki adequdately
  • a mixing weight ratio of roseki with an average grain diameter equal to or less than 250 ⁇ m is equal to or less than 60% relative to the whole of the roseki content because, in the range of over 60%, structural defects such as lamination are apt to be produced in molding and softening deformation of roseki particles is apt to happen when used in a continuous casting nozzle.
  • the half-melting temperature of the roseki is about 1500°C, and it melts at the bore surface contacting with the molten steel to form a glass coat for smoothing the structure of the surface of the bore and for preventing air from being entrapped through a refractory structure, so that it has the effect to depress the adherence of Al 2 O 3 and metal.
  • a mixing weight ratio of the graphite is equal to or more than 10 wt%. Also, it is preferably that the mixing weight ratio of the graphite is equal to or less than 35 wt% from the view point of manufacturing of the nozzle because the volume ratio of the graphite relative to the roseki is too large so that structural defects such as lamination are apt to be produced in the range of over 35 wt%.
  • natural graphite is suitable as the graphite to be mixed.
  • an aggregate of 10 to 60 wt% selected from from alumina matter, zirconia matter, zircon matter, or alumina-silica matter should be selected, to obtain a sufficient erosion resistance of the nozzle against molten steel.
  • a surface layer 2 of the bore 1, through which the molten steel flows, of the immersion nozzle 10 consists of a refractory having the chemical composition as described above.
  • the rest part of the nozzle 3 is composed of regular refractory, for example, of alumina-graphite which is already known in public.
  • the dimensions of the nozzle are about 1,000mm in total length, about 60mm in diameter of the bore, 160mm in outer diameter, and about 50mm in thickness.
  • FIG. 2 shows another embodiment of the invention, a nozzle comprising a refractory according to the present invention at the surface layer of the bore of the nozzle and the lower part (a part immersed in the molten steel) of the nozzle.
  • the adherence and accumulation of non-metallic inclusion such as the ⁇ -alumina are depressed.
  • sample of the present invention having the chemical compositions within the scope of the present invention
  • samples Nos. 6 to 8 having chemical compositions out of the scope of the present invention
  • a first formed body (hereinafter referred to as the "formed body 1") with dimensions of 30mm by 30mm by 230mm for examining an amount of adhesion of non-metallic inclusion such as alumina and corrosion resistance against the molten steel, a second formed body (hereinafter referred to as the “formed body 2”) with dimensions of 50mm ⁇ by 20mm for examining permeability, and a third formed body (hereinafter referred to as the “formed body 3”) with dimensions of 100mm in outer diameter, 60mm in inner diameter and 250mm in length for examining spalling resistance, were respectively prepared, and then the bodies were sintered in reducing atmosphere at a temperature in a range from 1000 to 1200°C and samples 1 to 8 were prepared.
  • the samples of the present invention can prevent air from being entrapped through the refractory in practical use because of small permeability.
  • the amount of adhesion of alumina is remarkably large, because it contains Al 2 O 3 and SiO 2 , which decomposes to supply oxygen in the steel, instead of the roseki.
  • the sample for comparison No. 8 does not contain SiO 2 instead of roseki and contains only Al 2 O 3 and it has high permeability and the amount of adhesion of alumina is remarkably large, although it contains no mineral source of oxgen to the steel.
  • the continuous casting nozzle for casting steel according to the present invention it is possible to perform stable casting with preventing narrowing or clogging of the bore caused by the non-metallic inclusion such as alumina without deterioration of the refractory structure.
  • approximately 300 ton of a low carbon aluminum killed steel of 5 to 7 charges is continuously cast with one nozzle without clogging by 2 strand slab caster in real operation, though with conventional nozzle, clogging up in the nozzle were occurred within 2 to 4 charges under same condition.
EP97118925A 1996-12-05 1997-10-30 Ausguss für den Einsatz im Stahl-Strangguss Expired - Lifetime EP0846514B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP34259796 1996-12-05
JP8342597A JPH10166116A (ja) 1996-12-05 1996-12-05 連続鋳造用ノズル
JP342597/96 1996-12-05

Publications (2)

Publication Number Publication Date
EP0846514A1 true EP0846514A1 (de) 1998-06-10
EP0846514B1 EP0846514B1 (de) 2000-12-20

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EP97118925A Expired - Lifetime EP0846514B1 (de) 1996-12-05 1997-10-30 Ausguss für den Einsatz im Stahl-Strangguss

Country Status (6)

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EP (1) EP0846514B1 (de)
JP (1) JPH10166116A (de)
AT (1) ATE198172T1 (de)
AU (1) AU730801B2 (de)
CA (1) CA2223356C (de)
DE (1) DE69703729T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0970768A1 (de) * 1998-07-09 2000-01-12 Akechi Ceramics Kabushiki Kaisha Ausgussdüse zum kontinuierlichen Giessen von Stahl
EP1097763A1 (de) * 1999-04-05 2001-05-09 Akechi Ceramics Kabushiki Kaisha Stranggiessdüse

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2302310C (en) 1999-04-09 2006-08-01 Akechi Ceramics Kabushiki Kaisha A continuous casting nozzle
EP1096307B1 (de) 1999-10-28 2008-08-27 FUJIFILM Corporation Optisches Wellenlängenumwandlungssystem und wellenlängenstabilisierter Laser
JP2014073528A (ja) * 2012-09-11 2014-04-24 Akechi Ceramics Co Ltd 連続鋳造用ノズル

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1808778A1 (de) * 1968-07-31 1970-08-20 Yawata Iron & Steel Co Ausgiessduese fuer Metallschmelzen
JPS5641871A (en) * 1979-09-13 1981-04-18 Akechi Taikarenga Kk Continuously casting immersion nozzle
JPS6278151A (ja) * 1985-09-28 1987-04-10 新日本製鐵株式会社 溶融金属容器用不焼成耐火煉瓦
JPS62148076A (ja) * 1985-12-23 1987-07-02 Akechi Ceramics Kk 連続鋳造用ノズル
GB2202218A (en) * 1987-02-19 1988-09-21 De Beers Ind Diamond Method of making an article from pyrophyllite
GB2227962A (en) * 1989-02-07 1990-08-15 Akechi Ceramics Kk Molten steel pouring nozzle
US5046647A (en) * 1987-09-03 1991-09-10 Toshiba Ceramics Co., Ltd. Nozzle for discharging molten metal used in a casting device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1808778A1 (de) * 1968-07-31 1970-08-20 Yawata Iron & Steel Co Ausgiessduese fuer Metallschmelzen
JPS5641871A (en) * 1979-09-13 1981-04-18 Akechi Taikarenga Kk Continuously casting immersion nozzle
JPS6278151A (ja) * 1985-09-28 1987-04-10 新日本製鐵株式会社 溶融金属容器用不焼成耐火煉瓦
JPS62148076A (ja) * 1985-12-23 1987-07-02 Akechi Ceramics Kk 連続鋳造用ノズル
GB2202218A (en) * 1987-02-19 1988-09-21 De Beers Ind Diamond Method of making an article from pyrophyllite
US5046647A (en) * 1987-09-03 1991-09-10 Toshiba Ceramics Co., Ltd. Nozzle for discharging molten metal used in a casting device
GB2227962A (en) * 1989-02-07 1990-08-15 Akechi Ceramics Kk Molten steel pouring nozzle

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8123, Derwent World Patents Index; Class L02, AN 81-41169D, XP002055648 *
DATABASE WPI Section Ch Week 8720, Derwent World Patents Index; Class L02, AN 87-139561, XP002055647 *
FALBE J ET AL: "ROEMPP CHEMIE LEXIKON, PASSAGE", ROMPP CHEMIE LEXIKON, PL -S, no. BD. 5, 1992, FALBE J;REGITZ M, pages 3708/3709, XP002048137 *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 377 (M - 649) 9 December 1987 (1987-12-09) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0970768A1 (de) * 1998-07-09 2000-01-12 Akechi Ceramics Kabushiki Kaisha Ausgussdüse zum kontinuierlichen Giessen von Stahl
US6283341B1 (en) * 1998-07-09 2001-09-04 Akechi Ceramics Kabushiki Kaisha Continuous casting nozzle for molten steel
EP1097763A1 (de) * 1999-04-05 2001-05-09 Akechi Ceramics Kabushiki Kaisha Stranggiessdüse
EP1097763B1 (de) * 1999-04-05 2004-09-29 Akechi Ceramics Kabushiki Kaisha Stranggiessdüse

Also Published As

Publication number Publication date
JPH10166116A (ja) 1998-06-23
DE69703729D1 (de) 2001-01-25
ATE198172T1 (de) 2001-01-15
AU4522997A (en) 1998-06-11
CA2223356C (en) 2002-07-23
DE69703729T2 (de) 2001-04-19
EP0846514B1 (de) 2000-12-20
AU730801B2 (en) 2001-03-15
CA2223356A1 (en) 1998-06-05

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