EP0280766A2 - Procédé et installation de coulée continue sous laitier électro conducteur d'aciers et d'alliages - Google Patents

Procédé et installation de coulée continue sous laitier électro conducteur d'aciers et d'alliages Download PDF

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Publication number
EP0280766A2
EP0280766A2 EP87114823A EP87114823A EP0280766A2 EP 0280766 A2 EP0280766 A2 EP 0280766A2 EP 87114823 A EP87114823 A EP 87114823A EP 87114823 A EP87114823 A EP 87114823A EP 0280766 A2 EP0280766 A2 EP 0280766A2
Authority
EP
European Patent Office
Prior art keywords
slag
mold
electrically conductive
liquid
heated
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.)
Withdrawn
Application number
EP87114823A
Other languages
German (de)
English (en)
Other versions
EP0280766A3 (fr
Inventor
Wolfgang Dipl.-Ing. Dr. Mont. Holzgruber
Manfred Dipl.-Ing. Haissig
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.)
Inteco Internationale Techinsche Beratung GmbH
Original Assignee
Inteco Internationale Techinsche Beratung GmbH
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
Application filed by Inteco Internationale Techinsche Beratung GmbH filed Critical Inteco Internationale Techinsche Beratung GmbH
Publication of EP0280766A2 publication Critical patent/EP0280766A2/fr
Publication of EP0280766A3 publication Critical patent/EP0280766A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting

Definitions

  • the invention relates to a method for the continuous casting of steels, in particular tool steels, such as, for example, high-speed steels, ledeburitic Cr steels, steels for cold and hot work, etc., from a warming or distribution vessel into a - in particular water-cooled, open at the bottom, straight or curved - mold from which the partially solidified strand is withdrawn continuously or step by means of a pull-out device.
  • tool steels such as, for example, high-speed steels, ledeburitic Cr steels, steels for cold and hot work, etc.
  • the invention also relates to a device for carrying out this method.
  • the electro-slag remelting of self-consumable electrodes enables the production of remelting blocks with a good surface at a slow block build-up speed.
  • the shallow sump depths that occur lead to a uniform solidification between the edge and core and thus to a good internal quality of the remelted blocks.
  • the use of short molds with lowerable base plates and electrode changes also allows the production of relatively long strands. In the production of small dimensions, however, the production of the required consumable electrodes becomes difficult, and the process costs due to the then low remelting rates become high.
  • liquid metal can be made available from a heated pan at a constant temperature over a long period of time.
  • the object of the invention is to avoid the respective disadvantages of the above-described methods by means of suitable measures and, if possible, to utilize their advantages.
  • the aim is the continuous production of strands with a good surface at casting speeds that are significantly lower than those required and customary in continuous casting, which means that a sufficiently good core zone can also be expected.
  • the solution to this problem is that the liquid metal level is completely covered by an overheated, electrically conductive liquid slag, the slag is additionally heated and the liquid steel is poured through the liquid slag, the casting speed being set so that it is at least 1 5 times the usual remelting rates for electroslag remelting and a maximum of 50% of the usual casting speed for continuous casting.
  • the inventor took advantage of the knowledge to lower the casting speed during continuous casting that excellent block surfaces can be achieved with electro-slag remelting at still considerably low block build-up speeds, since the surface of the liquid steel in the mold is kept warm by heated slag, so that the slag progresses Freezing over the meniscus is prevented.
  • the pouring rate in kg / h should be at least 1.5 times the diameter in the case of round strands or the length of the side in the square or the mean of the short and long side length in the case of rectangular strands in mm.
  • the maximum pouring rate should be so low that a depth of the liquid sump of 4 m is not exceeded.
  • the layer thickness of the electrically conductive slag should be at least 20 mm according to a further feature of the invention.
  • the slag can be heated by one or more non-consumable electrodes made of graphite, tungsten, molybdenum or other high-melting electrically conductive materials which are connected to a power source.
  • the slag bath can also be heated by a plasma torch.
  • molds as are common in continuous casting, can be used to carry out the method.
  • small cross sections - such as 100 mm and less - it becomes difficult to arrange one or more electrodes in addition to the pouring stream in the mold.
  • the second pole can also be formed by the liquid metal running from an upstream distributor, the power supply being able to do this via electrodes built into the distributor wall.
  • Another possibility is to also cover the distributor with an electrically conductive slag and also to produce the power supply there via an electrode immersed in the slag.
  • the second pole can also be formed by a second electrode immersed in the slag bath in the mold.
  • the strand can be withdrawn from the mold continuously or step by step.
  • a step-by-step strand withdrawal is selected when the mold is stationary, and a return stroke step can be connected to each withdrawal step.
  • the mold carries out an oscillating movement in such a way that the strand is briefly overtaken by the mold when moving in the strand withdrawal direction.
  • a pouring jet 4 runs from a spout 5 into a water-cooled funnel mold 6, which is open at the bottom, from a bricked-up distribution vessel 1, in which there is liquid metal 3 under a covering layer of covering slag 2.
  • a metal mirror 7 of a strand 12 is superimposed therein with an electrically conductive, overheated slag 8, in which a tubular graphite electrode 9 is immersed. This is connected to a power source 10.
  • the second pole of the current source 10 is an electrode 11 installed in the distributor, from where the current flow via the liquid metal 3 into the funnel mold 6 and through the slag 8 to the graphite electrode 9.
  • the strand 12 formed in the funnel mold 6 is drawn off downwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP87114823A 1987-03-03 1987-10-10 Procédé et installation de coulée continue sous laitier électro conducteur d'aciers et d'alliages Withdrawn EP0280766A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT46387A AT399463B (de) 1987-03-03 1987-03-03 Verfahren zum elektroschlacke-stranggiessen von stählen und legierungen
AT463/87 1987-03-03

Publications (2)

Publication Number Publication Date
EP0280766A2 true EP0280766A2 (fr) 1988-09-07
EP0280766A3 EP0280766A3 (fr) 1989-02-22

Family

ID=3491291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114823A Withdrawn EP0280766A3 (fr) 1987-03-03 1987-10-10 Procédé et installation de coulée continue sous laitier électro conducteur d'aciers et d'alliages

Country Status (3)

Country Link
EP (1) EP0280766A3 (fr)
AT (1) AT399463B (fr)
DE (1) DE3734339A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0786531A1 (fr) * 1996-01-29 1997-07-30 Inteco Internationale Technische Beratung Gesellschaft mbH Procédé et dispositif pour la refusion de métaux sous forme de barres
AT406239B (de) * 1996-04-09 2000-03-27 Inteco Int Techn Beratung Wassergekühlte kokille für das stranggiessen oder elektroschlacke-umschmelzen
CN102089101A (zh) * 2008-07-04 2011-06-08 阿勒里斯铝业科布伦茨有限公司 复合锭的铸造方法
CN102941323A (zh) * 2012-12-12 2013-02-27 济钢集团有限公司 中薄板坯连铸机结晶器低液位快速变更换中间包的方法
CN110548840A (zh) * 2019-10-09 2019-12-10 辽宁科技大学 在连铸过程中向结晶器加入加热固态保护渣的装置及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT408528B (de) 1999-06-08 2001-12-27 Inteco Int Techn Beratung Verfahren und vorrichtung zur kontinuierlichen herstellung von gegossenen oder umgeschmolzenen strängen nach einem elektroschlacke-verfahren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483646A1 (de) * 1965-06-11 1969-09-25 Suedwestfalen Ag Stahlwerke Verfahren und Vorrichtung zum Herstellen von Gussbloecken,vorzugsweise Stahlbloecken
FR1513573A (fr) * 1967-01-06 1968-02-16 Soc Metallurgique Imphy Procédé et dispositif pour l'affinage du métal dans une installation de coulée continue
SE332833B (sv) * 1968-06-27 1977-09-19 Asea Ab Kokill for tillverkning av got av stal och metallegeringar genom elektroslaggraffineringsmetoden
SE364648B (fr) * 1970-12-04 1974-03-04 Asea Ab
AT330389B (de) * 1973-11-08 1976-06-25 Voest Ag Verfahren zum kontinuierlichen giessen von stahlstrangen, insbesondere brammen, in einer stranggiessanlage
GB2038367B (en) * 1978-10-12 1982-09-29 Nippon Steel Corp Controlling the aluminium content of continuously cast silicon steels

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0786531A1 (fr) * 1996-01-29 1997-07-30 Inteco Internationale Technische Beratung Gesellschaft mbH Procédé et dispositif pour la refusion de métaux sous forme de barres
AT406384B (de) * 1996-01-29 2000-04-25 Inteco Int Techn Beratung Verfahren zum elektroschlacke-strangschmelzen von metallen
AT406239B (de) * 1996-04-09 2000-03-27 Inteco Int Techn Beratung Wassergekühlte kokille für das stranggiessen oder elektroschlacke-umschmelzen
CN102089101A (zh) * 2008-07-04 2011-06-08 阿勒里斯铝业科布伦茨有限公司 复合锭的铸造方法
CN102089101B (zh) * 2008-07-04 2014-07-09 阿勒里斯铝业科布伦茨有限公司 复合锭的铸造方法
CN102941323A (zh) * 2012-12-12 2013-02-27 济钢集团有限公司 中薄板坯连铸机结晶器低液位快速变更换中间包的方法
CN110548840A (zh) * 2019-10-09 2019-12-10 辽宁科技大学 在连铸过程中向结晶器加入加热固态保护渣的装置及方法
CN110548840B (zh) * 2019-10-09 2024-04-02 辽宁科技大学 在连铸过程中向结晶器加入加热固态保护渣的装置及方法

Also Published As

Publication number Publication date
DE3734339A1 (de) 1988-09-15
EP0280766A3 (fr) 1989-02-22
ATA46387A (de) 1994-10-15
AT399463B (de) 1995-05-26

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Inventor name: HOLZGRUBER, WOLFGANG, DIPL.-ING. DR. MONT.

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