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WO2001072454A1 - Procede et dispositif de coulee continue d'aciers calmes a l'aluminium au moyen d'une coquille refroidie par eau - Google Patents

Procede et dispositif de coulee continue d'aciers calmes a l'aluminium au moyen d'une coquille refroidie par eau Download PDF

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Publication number
WO2001072454A1
WO2001072454A1 PCT/EP2001/003620 EP0103620W WO0172454A1 WO 2001072454 A1 WO2001072454 A1 WO 2001072454A1 EP 0103620 W EP0103620 W EP 0103620W WO 0172454 A1 WO0172454 A1 WO 0172454A1
Authority
WO
WIPO (PCT)
Prior art keywords
casting
sen
insulation
immersion
ceramic
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.)
Ceased
Application number
PCT/EP2001/003620
Other languages
German (de)
English (en)
Other versions
WO2001072454A8 (fr
Inventor
Fritz-Peter Pleschiutschnigg
Stephan Feldhaus
Eckart Schwencke
Naiyuan Tian
Yin Bingxi
Erwin Wosch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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 claimed from DE10114677A external-priority patent/DE10114677C2/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Priority to AU2001256239A priority Critical patent/AU2001256239A1/en
Publication of WO2001072454A1 publication Critical patent/WO2001072454A1/fr
Publication of WO2001072454A8 publication Critical patent/WO2001072454A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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

Definitions

  • the deoxidation products which consist of 50% CaO and 50% Al 2 O3, for example, when the steel flows through the SEN into the mold (4) on the SEN inner wall ( 5) in the area of the Nernst layer (6), here there is a 0 to negative flow, do not cool and become solid.
  • the SEN inner wall (5) which is 20 mm thick, for example, has a conductivity of between 5 and 15 W / mK depending on the material and cools down below 1400 ° C. via the radiation from the outer skin (7), for example liquid oxide particles for solidification, become solid and are deposited. This is also clear from Figure 2.
  • the phase diagram CaO / Al 2 O 3 shows that the low-melting eutectics are around 1,400 and 1,410 ° C and a composition of around 50 ° / 0/50% CaO / Al 2 ⁇ 3.
  • the invention is based on the object of taking measures which make it possible, for example, for a mixed oxide between 44% and 57% CaO with 56% and 43% Al 2 O 3 to travel through the SEN (1) on the inner wall ( 5) did not reach the deposit.
  • the mixed oxide based on CaO / A Oa can, for example, also contain other oxides such as SiO 2 and MnO in a percentage of 10%.
  • the inside wall temperature of the SEN without insulation ( Figure 3) with a wall thickness (5.1) of 20 mm, a conductivity of 10 W / mk and a liquidus temperature of the steel of 1,525 ° C is approx. 1,100 ° C (5.2) and an outside temperature (5.3) from 800 ° C.
  • an alumina-graphite material is to be assumed.
  • the conductivity can be adjusted by means of the graphite content in the isostatically pressed AI2O3 immersion pouring material with the help of the C content.
  • C content With increasing C content, the conductivity and the resistance to temperature changes increase, but the casting slag resistance (8) in the casting level (9) of the mold (4) decreases.
  • a silted SiO 2 -SEN on the other hand, only has a conductivity of 3 - 5 W / mK.
  • FIGS. 1-3 The invention, which is not obvious to a person skilled in the art, is described by way of example in FIGS. 1-3.
  • Figure 1 shows the situation distributor / stopper / SEN / mold as state of the art (partial picture 1 a) and with thermal insulation as an inventive solution (Figure 1 b).
  • Figure 2 shows the oxide phase diagram CaO / Al 2 ⁇ 3 with the melting behavior of the mixed oxides.
  • FIG. 3 shows the SEN wall temperatures as a function of the SEN wall thickness, starting from the inner SEN wall to the outer (state of the art) or to the outer wall of the insulation (inventive solution).
  • Figure 1 shows a schematic section through the distributor (10) with a stopper (11) as a control of the steel quantities, a SEN (1), a water-cooled mold (4), a steel casting level (9), pouring slag (8), casting powder (8.1 ) and a strand (12), consisting of strand shell (12.1) and liquid core (12.2), which is conveyed from the mold at a casting speed (12.3).
  • the steel in partial image 1 a which represents the prior art, shows liquid oxide particles (13) in the stopper area, which become liquid at the prevailing temperature of, for example, 1,540 ° C. and a composition of 47% / 53% CaO / Al 2 O 3 and present as an emulsion in steel.
  • the slag drop (13) can solidify into a solid particle (13.1) and in the area of the Nernst deposit the boundary layer (6) on the SEN inner wall and lead to oxidic deposits (13.2). These deposits are then washed out of the SEN again as colonies (13.3).
  • This rinsed colony (13.3) will then rise in a certain ratio into the pouring slag (8) (13.5) or freeze as a cluster (also called 'macroscopic inclusion') (13.4) in the strand.
  • This conversion of the liquid mixed oxide (13) from the liquid to the doughy to solid phase (13.1) takes place e.g. B. on the SEN inner wall (5) at z. B. 1,100 ° C (5.2) instead.
  • the inventive solution is shown schematically in partial image 1b.
  • the inner wall of the SEN (1) remains by an insulation (14) made of rock wool from z. B. 20 - 30 mm hotter, has a temperature of z. B. 1,500 ° C and prevents the liquid mixed oxide (13) solidifies and thus accumulates in the Nernst limit region (6).
  • the oxidic emulsion (13) flows with the steel through the SEN (1) and therefore does not lead to deposits (13.2) and therefore no macroscopic inclusions or clusters (13.4).
  • immersion spouts with steel wool insulation are to be regarded as state of the art. However, they should minimize the cooling of the pipe between the end of the heating and the start of the casting in order to counteract the changes in temperature at the start of casting, and their thickness is max. approx. 10 mm.
  • the invention raises the wall temperature of the SEN (1) completely differently during casting in order to avoid that the mixed oxides of the deoxidation products solidify and deposit on the cold SEN wall (5) during their casting through the SEN.
  • FIG. 2 shows the two-phase diagram of the mixed oxide CaO / Afe ⁇ 3.
  • the Al-calmed steel is treated with Ca, and it becomes a mixed oxide of 47% Al 2 O with a solidification point of 1,450 ° C, 49% AI 2 O3 with a freezing point of 1,400 ° C or 53% AI2O3 with a freezing point of 1,410 ° C.
  • the mixed oxide range is, for example, 44% or 57% Al 2 O 3
  • the mixed oxide solidifies at approx. 1,500 ° C. With a content of 51%, the solidification of the emulsion is approx. 1,460 ° C.
  • the slag particles now experience a cooling in the area of the Nernst boundary layer (6) on the inner wall of the SEN (5) on their journey with the steel through the SEN (1).
  • care must be taken to ensure that this solidification temperature of the mixed oxide is not reached by appropriate insulation.
  • FIG. 3 shows an example of a SEN wall (1.1) with a thickness of 20 mm, the SEN inside wall temperature without and with 25 mm rock wool insulation. It can be seen that without insulation, the internal SEN temperature (5.2) is 1,100 ° C and the external SEN temperature (5.3) is 800 ° C. These conditions will promote the solidification of the emulsion (13) to a solid particle (13.1), the deposition (13.2) and thus the formation of clusters (13.4), regardless of the composition of the mixed oxide.
  • the SEN wall (1.1) is provided with an insulation (14) made of stone wool or ceramic wool and a thickness of 25 mm, the internal SEN temperature rises depending on the thermal conductivity
  • the diagram which is based on a physical-mathematical simulation, shows that the outside temperature increases when the insulation is used from 800 (5.3) to 1,300 ° C (X.3) and the outer skin of the insulation a temperature of 400 ° C (14.1).
  • the SEN wall thicknesses range between 10 and 45 mm, depending on the desired maximum casting time and the space available in the mold. Thin slab molds with and without a funnel opening have wall thicknesses of 30 - 10 mm.
  • the internal SEN temperature can of course also be increased by increasing the insulation thickness from, for example, 25 to 30 or 35 mm and / or by increasing the SEN wall thickness.
  • the wall of the SEN is chemically dissolved by the pouring slag (8) and the steel in the casting level (9) at approx. 1 - 2 mm / hour and thus consumed.
  • This invention allows the deposition of mixed oxides of the by a simple means, namely by isolating the SEN wall between the distributor base plate (10.1) and the mold level (9) or the surface of the mold powder (8.2) or the upper edge of the mold (4.2) Avoid binary oxide systems Al 2 O 3 / CaO between 40 and 60% Al 2 O3 with residual oxides such as SiO 2 and / or Mn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

La présente invention concerne un procédé de coulée d'aciers calmés par aluminium, au moyen d'une coquille refroidie par eau. Ces aciers sont traités avec du Ca à la fin du traitement métallurgique secondaire et les produits de désoxydation de la composition présentent, dans le diagramme à deux phases Al2O3/Ca, entre 40 et 60 % d'Al2O3. Selon cette invention, lors d'une coulée avec une conduite en céramique, la conductivité thermique est réduite au moyen d'une isolation supplémentaire qui est pourvue entre le fond du distributeur et le niveau de coulée et la température superficielle extérieure de la busette de coulée immergée, entre le fond du distributeur et le niveau de coulée, est élevée à plus de 700 °C. A cette fin, une conduite de coulée en céramique (1) présente une isolation (14) constituée d'une laine céramique (14), la température superficielle extérieure à la surface de ladite laine céramique étant inférieure à 700 °C (14.1).
PCT/EP2001/003620 2000-03-29 2001-03-29 Procede et dispositif de coulee continue d'aciers calmes a l'aluminium au moyen d'une coquille refroidie par eau Ceased WO2001072454A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001256239A AU2001256239A1 (en) 2000-03-29 2001-03-29 Method and device for the continuous casting of aluminum-killed steels by means of a water-cooled permanent mold

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10015466.2 2000-03-29
DE10015466 2000-03-29
DE10114677.9 2001-03-23
DE10114677A DE10114677C2 (de) 2000-03-29 2001-03-23 Verfahren und Vorrichtung zum Stranggießen von Al-beruhigten Stählen mit einer wassergekühlten Kokille

Publications (2)

Publication Number Publication Date
WO2001072454A1 true WO2001072454A1 (fr) 2001-10-04
WO2001072454A8 WO2001072454A8 (fr) 2001-12-06

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PCT/EP2001/003620 Ceased WO2001072454A1 (fr) 2000-03-29 2001-03-29 Procede et dispositif de coulee continue d'aciers calmes a l'aluminium au moyen d'une coquille refroidie par eau

Country Status (2)

Country Link
AU (1) AU2001256239A1 (fr)
WO (1) WO2001072454A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007039052A1 (fr) * 2005-10-04 2007-04-12 Sms Demag Ag Busette de coulee immergee pour metaux liquides, en particulier pour aciers

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628706A (en) * 1968-10-15 1971-12-21 Southwire Co Long life spout
US4401243A (en) * 1976-10-13 1983-08-30 Mannesmann Aktiengesellschaft Charging a mold for continuous casting
EP0178053A1 (fr) * 1984-09-06 1986-04-16 Foseco Trading A.G. Busettes de coulée
US4640447A (en) * 1983-11-02 1987-02-03 Didier-Werke Ag Molten metal immersion pouring spout
US4776502A (en) * 1984-06-05 1988-10-11 Chamotte- Und Tonwerk Kurt Hagenburger Ceramic spout
JPH06254663A (ja) * 1993-03-04 1994-09-13 Sumitomo Metal Ind Ltd 断熱層付連続鋳造用中間ノズル
JPH0751818A (ja) * 1993-08-10 1995-02-28 Kurosaki Refract Co Ltd カーボン含有鋳造用ノズル
US5866022A (en) * 1997-03-24 1999-02-02 North American Refractories Company Refractory pour tube with cast plate
US5947180A (en) * 1996-09-25 1999-09-07 Bayer Aktiengesellschaft Rising pipe for light metal melts
JPH11245005A (ja) * 1998-03-06 1999-09-14 Toshiba Ceramics Co Ltd 溶融金属排出用ノズル

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628706A (en) * 1968-10-15 1971-12-21 Southwire Co Long life spout
US4401243A (en) * 1976-10-13 1983-08-30 Mannesmann Aktiengesellschaft Charging a mold for continuous casting
US4640447A (en) * 1983-11-02 1987-02-03 Didier-Werke Ag Molten metal immersion pouring spout
US4776502A (en) * 1984-06-05 1988-10-11 Chamotte- Und Tonwerk Kurt Hagenburger Ceramic spout
EP0178053A1 (fr) * 1984-09-06 1986-04-16 Foseco Trading A.G. Busettes de coulée
JPH06254663A (ja) * 1993-03-04 1994-09-13 Sumitomo Metal Ind Ltd 断熱層付連続鋳造用中間ノズル
JPH0751818A (ja) * 1993-08-10 1995-02-28 Kurosaki Refract Co Ltd カーボン含有鋳造用ノズル
US5947180A (en) * 1996-09-25 1999-09-07 Bayer Aktiengesellschaft Rising pipe for light metal melts
US5866022A (en) * 1997-03-24 1999-02-02 North American Refractories Company Refractory pour tube with cast plate
JPH11245005A (ja) * 1998-03-06 1999-09-14 Toshiba Ceramics Co Ltd 溶融金属排出用ノズル

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 650 (M - 1719) 9 December 1994 (1994-12-09) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 14 22 December 1999 (1999-12-22) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007039052A1 (fr) * 2005-10-04 2007-04-12 Sms Demag Ag Busette de coulee immergee pour metaux liquides, en particulier pour aciers
CN101282803B (zh) * 2005-10-04 2015-04-29 Sms西马格股份公司 浸入式浇注装置

Also Published As

Publication number Publication date
WO2001072454A8 (fr) 2001-12-06
AU2001256239A1 (en) 2001-10-08

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