EP1452252A1 - Procédé de coulée continue - Google Patents

Procédé de coulée continue Download PDF

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Publication number
EP1452252A1
EP1452252A1 EP03450060A EP03450060A EP1452252A1 EP 1452252 A1 EP1452252 A1 EP 1452252A1 EP 03450060 A EP03450060 A EP 03450060A EP 03450060 A EP03450060 A EP 03450060A EP 1452252 A1 EP1452252 A1 EP 1452252A1
Authority
EP
European Patent Office
Prior art keywords
strand
coolant
cooling
mould
process according
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Withdrawn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
EP03450060A
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German (de)
English (en)
Inventor
Hubert Dipl.-Ing. Sommerhofer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP03450060A priority Critical patent/EP1452252A1/fr
Priority to PCT/EP2004/001794 priority patent/WO2004076096A1/fr
Priority to EP04713860A priority patent/EP1599300B1/fr
Priority to DE602004007628T priority patent/DE602004007628T2/de
Priority to CA2516038A priority patent/CA2516038C/fr
Priority to PL378634A priority patent/PL206578B1/pl
Priority to BRPI0407886-1A priority patent/BRPI0407886B1/pt
Priority to CNB200480005192XA priority patent/CN100342996C/zh
Priority to SI200430459T priority patent/SI1599300T1/sl
Priority to AT04713860T priority patent/ATE367228T1/de
Priority to MXPA05009163A priority patent/MXPA05009163A/es
Priority to ES04713860T priority patent/ES2290675T3/es
Priority to US10/547,607 priority patent/US20070074846A1/en
Priority to AU2004216532A priority patent/AU2004216532B2/en
Priority to JP2006501935A priority patent/JP2007523745A/ja
Publication of EP1452252A1 publication Critical patent/EP1452252A1/fr
Priority to IL170168A priority patent/IL170168A/en
Priority to ZA200506448A priority patent/ZA200506448B/en
Priority to NO20054099A priority patent/NO20054099L/no
Priority to IS8046A priority patent/IS2493B/is
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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1241—Accessories for subsequent treating or working cast stock in situ for cooling by transporting the cast stock through a liquid medium bath or a fluidized bed

Definitions

  • the invention concerns the continuous casting of metals of all kinds.
  • the casting melt is cooled indirect by a mould as far as it is necessary to solidify a shell strong enough to carry the stresses at the mould exit and to resist a breakout of liquid casting melt.
  • the strand is cooled directly by water realised as film cooling or as spray cooling or a two phase cooling with water and air.
  • the direct cooling stage ensures the solidification of the liquid core of the strand.
  • the second cooling stage is followed by a third one, a submerging in a water bath or a soft cooling stage by a flow of air.
  • a heated mould is used in the so called Ohno continuous casting process (OCC), the mould temperatures are higher than the melting point of the cast material in order to prevent nucleation at the mould wall and to ensure axial directional solidification.
  • OCC Ohno continuous casting process
  • the necessary heat removal for this process is realised by direct cooling at only one position at a defined distance from the mould exit.
  • Strands produced in this process are always single crystals with a very smooth surface. But the production of single crystals is not the aim of usual continuous casting, since the produced strands should be formable by rolling, extruding or forging with isotropic properties.
  • the EP 063 832 discloses a concept for the "casting" of a probe which gets solidified in its mould and is therefore no real casting process, even less a continuous casting process.
  • the DE 41 27 792 discloses to cast a problematic probe into a pre-heated mould with special geometric properties, where a special form of solidification takes place. This is a casting process, but has nothing to do with a continuous casting process.
  • the invention proposes to use liquified metal as cooling medium and, advantageously, an insulated mould. This makes sure that no steam film exists at the surface of the strand. This, in turn, guarantees that the cooling properties and characteristics are well defined and controllable.
  • the mould consists preferably of an insulating mould, which enables a solidification of the strand shell in the near vicinity of the mould exit. This is responsible for the prevention of many surface defects and the prevention of an unwanted subsurface layer. Solidification occurs by the influence of the direct cooling.
  • the direct cooling uses a liquid metal like lead, tin, bismuth, gallium, indium or alloys of them as well as other liquid metals or alloys being liquid below the solidification temperature of the cast metal or alloy.
  • the feature of direct cooling in continuous casting with liquid metal ensures a very constant cooling behaviour, prevents oxidation of the new formed strand surface and eliminates the danger of explosions as a consequence of the use of water as coolant fully. Furthermore the hot tearing and cold tearing may be eliminated by the choice of the cooling metal and cooling metal temperature at the cooler entry and cooler exit.
  • the produced strand is free of the well known subsurface layer usually found in conventional continuous casting processes. The grain structure of the produced strands can be controlled by adjusting the coolant temperature.
  • the liquid metal as coolant can be directed onto the hot strand surface as continuous film or as drops.
  • the coolant distribution unit can be realised by a continuous slot around the strand perimeter but also may consist of slotted segments at different angles to the strand withdrawal direction.
  • the mould itself can be cylindrical or conical getting wider in casting direction. For lower casting rates it is also possible to realise the direct cooling step by submerging the hot strand into a bath of liquid cooling metal.
  • Figure 1 shows a strand with vertical withdrawal direction.
  • the cooling is done in a totally new way, using a complete filled strand cooler which is operated similar to heat exchanger known from chemical industry.
  • the melt is sucked from the tundish 1 (which can be heated) into the mould 2 and solidifies at the mould exit since the strand is cooled by a liquid metal coolant over the entire length of a cooling unit 4.
  • the temperature of the strand decreases during its movement through the strand cooler until its end is reached.
  • a strand cleaning unit 7 ensures the slip off of the coolant from the strand.
  • the cold coolant is fed into the strand cooler 4 and is distributed as it is required for the cast shape by a coolant distribution unit 3. From the mould exit to a coolant collecting unit 6, the coolant takes up heat from the hot strand, thereby heating up.
  • the coolant collecting 6 unit ensures the required coolant distribution along the strand perimeter. This process type enables highest cooling rates but needs an accurate pressure control in the coolant feed.
  • Figure 2 represents a process type, in which the cast strand is cooled softer than in the process type of figure 1.
  • the casting melt is sucked from the tundish 1 (which can be heated) into the mould 2 and solidifies at the mould exit since the heat is withdrawn by the coolant in direct contact with the strand 4.
  • a cooling box 5 is provides around the area where the strand solidifies during its movement.
  • a strand cleaning unit 6 is fixed, it ensures that no coolant is remaining on the strand surface.
  • the "cold" coolant is distributed along the strand perimeter how it is required for the cast strand shape by a coolant distribution unit 3. After getting in contact with the strand, the now hot coolant flows down to the bottom of the cooling box 5 and then leaves it through the coolant outlet.
  • Figure 3 represents a casting process according to the invention, and mould, respectively, with a heat withdrawal rate between the two aforementioned ones.
  • the casting melt in the tundish 1 (which can be heated) is sucked into the mould 2 and solidifies at the mould exit.
  • the axial heat removal in the strand is, in a first cooling stage, similar to that according to Fig. 2 but gets increased by a second cooling stage in a cooling unit 7, which is similar to the cooling unit shown in Fig. 1.
  • the device for the first cooling stage consists of a coolant distributor 3 which produces a coolant film 4.
  • the device for the second cooling stage consists of a coolant distribution unit 5 and an attached heat exchanger tube 7, which ensures a higher heat removal than cooling stage one.
  • the strand is cleaned from the remaining coolant on the surface by the cleaning unit 8.
  • FIG. 4, 5 and 6, respectively, show devices similar to those shown in figures 1, 2 and 3, respectively, but with horizontal withdrawal of the strand.
  • Continuous casting with horizontal withdrawal is well known in the art, for the person skilled in the art, there is no problem to adapt the invention to this version of casting.
  • the only difference that should be mentioned is, that the liquid metal has a much higher densitythan the water which has been used in the prior art. Therefore, the free applied liquid in the devices according to Fig. 5 and the first cooling stage of Fig. 6 must be differently pressurised on the top-side and the down-side of the strand.
  • FIG. 7 shows the flow sheet for the whole casting plant:
  • the liquid metal used as coolant is stored in a tank 7, which needs to be heated by a heating unit 5 before starting the casting process.
  • the liquid coolant is pumped by the pump 7 into the cooling unit 3.
  • the cooling unit 3 it picks up heat from the hot strand, then the hot coolant leaves the cooling unit and gives up this heat in the heat exchanger 8.
  • the cold coolant flows back into the coolant tank 7.
  • the heat withdrawn in heat exchanger 8 can be used for different things in any case it may help to safe costs for energy in a firm.
  • the coolant tank as well as the whole cooling system needs to be free from air and especially from oxygen, this is ensured by flushing the coolant tank 7 and the cooling unit 3 with inert-gas.
  • inert-gas all such gases known in the art are usable, they have to stay inert at the given temperatures at contact with the coolant and the material of the strand. It is, of course, advantageous to use the same inert-gas in the storage tank 7 and the cooling unit 3.
  • the cooling unit 3 In order to come to defined and repeatable conditions in the cooling unit 3, it is preferred to have sensors for the temperature TIC, the flow rate FIC and the pressure PIC at least near the entrance of the cooling agent into the cooling unit 3. It is of course advantaguous to have further measuring points within this system.
  • Coolant can be a liquid metal like lead, tin, bismuth, gallium, indium or alloys of them as well as metals or alloys, which are having a melting point lower equal 60% of the melting point of the casting material. Further, it is possible to use non-metallic liquids, namely any liquid medium, which does not react with the material of the strand at the relevant temperatures and which stays in a liquid state at all temperatures involved in the cooling process. This may be some organic compounds, especially for strands of low-melting alloys.
  • the storage tank is arranged at lower level than the mould, but for safety reasons, this arrangement is preferred. If an other arrangement is provided, the pump and other armatures have to be put to other positions, but this brings no problem to the man skilled in the art.
  • the pipes, the pump, the armatures, the sensors, the cooling box, the pipe-like heat exchanger and other equipment for the coolant are, given the disclosure of the invention, readily available for the man skilled in the art of casting metal, may it be ferrous or not.
  • the casting process can apply one or more direct cooling steps.
  • the use of liquid metal as coolant prevents the formation of oxide layers on the strand surface.
  • the adjustment of the coolant feed temperature and coolant flow rate allows good control of the cooling rate and hence the formation of grain structure.
  • the use of an insulating mould prevents the formation of surface defects and inhomogeneous subsurface layers.
  • the use of liquid metal for the direct cooling in continuous casting eliminates the danger of explosions known from the conventional process using water as coolant. This increases the safety in cast shops enormous. For this continuous casting process no lubricant is necessary.
  • Applying one of the above described process types in horizontal continuous casting enables inline rolling of the cast ingots in order to safe energy costs for the reheating of the ingot.
  • the process eliminates hot tearing and cold tearing when operating at optimum process parameter (coolant temperatures at different stages of the cooling unit).
  • the process has no restrictions concerning the shape of the cast strand or the number of parallel cast strands.
  • the existing plants may easily be adapted to the invention, existing cooling systems using water my be stripped and replaced by the new system.
  • the mould itself hardly needs any adaptation, it is only necessary to have the freezing area at the end of the mould, therefore, insulated moulds or very short cooled moulds may be best used.

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  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Liquid Crystal Substances (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Filtration Of Liquid (AREA)
  • Lubricants (AREA)
  • Centrifugal Separators (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP03450060A 2003-02-28 2003-02-28 Procédé de coulée continue Withdrawn EP1452252A1 (fr)

Priority Applications (19)

Application Number Priority Date Filing Date Title
EP03450060A EP1452252A1 (fr) 2003-02-28 2003-02-28 Procédé de coulée continue
AT04713860T ATE367228T1 (de) 2003-02-28 2004-02-24 Verfahren zum straggiessen
MXPA05009163A MXPA05009163A (es) 2003-02-28 2004-02-24 Metodo de colado continuo.
DE602004007628T DE602004007628T2 (de) 2003-02-28 2004-02-24 Verfahren zum stranggiessen
CA2516038A CA2516038C (fr) 2003-02-28 2004-02-24 Procede de coulee en continu
PL378634A PL206578B1 (pl) 2003-02-28 2004-02-24 Sposób i urządzenie do odlewania ciągłego metali
BRPI0407886-1A BRPI0407886B1 (pt) 2003-02-28 2004-02-24 processo para lingotamento contìnuo de metais e dispositivo para a realização do mesmo.
CNB200480005192XA CN100342996C (zh) 2003-02-28 2004-02-24 连续铸造方法
SI200430459T SI1599300T1 (sl) 2003-02-28 2004-02-24 Postopek kontinuirnega litja
PCT/EP2004/001794 WO2004076096A1 (fr) 2003-02-28 2004-02-24 Procede de coulee en continu
EP04713860A EP1599300B1 (fr) 2003-02-28 2004-02-24 Procede de coulee en continu
ES04713860T ES2290675T3 (es) 2003-02-28 2004-02-24 Procedimiento de colada continua.
US10/547,607 US20070074846A1 (en) 2003-02-28 2004-02-24 Continuous casting method
AU2004216532A AU2004216532B2 (en) 2003-02-28 2004-02-24 Continuous casting method
JP2006501935A JP2007523745A (ja) 2003-02-28 2004-02-24 連続鋳造法
IL170168A IL170168A (en) 2003-02-28 2005-08-09 Continuous casting method
ZA200506448A ZA200506448B (en) 2003-02-28 2005-08-12 Continuous casting method
NO20054099A NO20054099L (no) 2003-02-28 2005-09-02 Fremgangsmate for kontinuerlig stoping
IS8046A IS2493B (is) 2003-02-28 2005-09-26 Aðferð til samfelldrar steypuvinnslu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03450060A EP1452252A1 (fr) 2003-02-28 2003-02-28 Procédé de coulée continue

Publications (1)

Publication Number Publication Date
EP1452252A1 true EP1452252A1 (fr) 2004-09-01

Family

ID=32749075

Family Applications (2)

Application Number Title Priority Date Filing Date
EP03450060A Withdrawn EP1452252A1 (fr) 2003-02-28 2003-02-28 Procédé de coulée continue
EP04713860A Expired - Lifetime EP1599300B1 (fr) 2003-02-28 2004-02-24 Procede de coulee en continu

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP04713860A Expired - Lifetime EP1599300B1 (fr) 2003-02-28 2004-02-24 Procede de coulee en continu

Country Status (18)

Country Link
US (1) US20070074846A1 (fr)
EP (2) EP1452252A1 (fr)
JP (1) JP2007523745A (fr)
CN (1) CN100342996C (fr)
AT (1) ATE367228T1 (fr)
AU (1) AU2004216532B2 (fr)
BR (1) BRPI0407886B1 (fr)
CA (1) CA2516038C (fr)
DE (1) DE602004007628T2 (fr)
ES (1) ES2290675T3 (fr)
IL (1) IL170168A (fr)
IS (1) IS2493B (fr)
MX (1) MXPA05009163A (fr)
NO (1) NO20054099L (fr)
PL (1) PL206578B1 (fr)
SI (1) SI1599300T1 (fr)
WO (1) WO2004076096A1 (fr)
ZA (1) ZA200506448B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1584387A1 (fr) * 2004-04-08 2005-10-12 Sanyu Seiki Co. Ltd. Procédé et dispositif de coulée continue horizontale de brame en magnésium ou d'alliage à base de magnésium
EP1844880A1 (fr) * 2006-04-12 2007-10-17 So & So Sommerhofer OEG Coulee en bande
CN109604550A (zh) * 2018-12-27 2019-04-12 河南理工大学 一种新型镁合金垂直半连续铸造装置

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US8080233B2 (en) * 2006-05-12 2011-12-20 Purdue Research Foundation Power generation from solid aluminum
JP5200406B2 (ja) * 2006-06-13 2013-06-05 Ｊｆｅスチール株式会社 鋼帯の冷却方法
KR101050798B1 (ko) 2008-12-19 2011-07-21 재단법인 포항산업과학연구원 마그네슘 합금 빌렛 연속주조장치
AT508292B1 (de) * 2009-05-28 2011-03-15 Mettop Gmbh Verfahren zur kühlung eines metallurgischen ofens sowie kühlkreislaufsystem für metallurgischeöfen
UA110573C2 (ru) * 2012-03-28 2016-01-12 Arcelormittal Investigacion Y Desarrollo Sl Процес безперервного лиття металу
US8365808B1 (en) 2012-05-17 2013-02-05 Almex USA, Inc. Process and apparatus for minimizing the potential for explosions in the direct chill casting of aluminum lithium alloys
US8479802B1 (en) * 2012-05-17 2013-07-09 Almex USA, Inc. Apparatus for casting aluminum lithium alloys
EP3117931B1 (fr) 2013-02-04 2020-10-21 Almex USA, Inc. Appareil permettant de minimiser le risque d'explosions dans le moulage en coquille d'alliages aluminium-lithium
US9936541B2 (en) 2013-11-23 2018-04-03 Almex USA, Inc. Alloy melting and holding furnace
AT515566A1 (de) 2014-03-06 2015-10-15 Inteco Special Melting Technologies Gmbh Verfahren zur Kühlung von flüssigkeitsgekühlten Kokillen für metallurgische Prozesse
CA3178979A1 (fr) 2014-05-21 2015-11-26 Novelis Inc. Regulation d'ecoulement de metal en fusion sans contact
CN107532849B (zh) 2015-02-18 2019-09-06 应达公司 用于活性金属和合金的电感应熔炼和保温炉
EP3599037A1 (fr) 2018-07-25 2020-01-29 Primetals Technologies Germany GmbH Section de refroidissement à réglage de flux de liquide de refroidissement à l'aide des pompes
CN109773166B (zh) * 2019-03-27 2020-12-04 宁国市华成金研科技有限公司 一种液态金属循环冷却系统及其冷却方法
CN112157245B (zh) * 2020-09-03 2022-03-29 中国科学院金属研究所 利用lmc定向凝固技术制备大尺寸定向叶片过程中定向柱晶晶粒控制方法

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US3430680A (en) * 1966-06-16 1969-03-04 George R Leghorn Method of forming structural shapes from molten material by stream casting
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SU863161A1 (ru) * 1979-06-15 1981-09-15 Предприятие П/Я М-5481 Устройство дл непрерывной разливки
US4510989A (en) * 1981-03-23 1985-04-16 Mayer Frederic C Production of metal rods
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US4955430A (en) * 1986-09-29 1990-09-11 Sherwood William L Continuous lead-float casting of steel
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1584387A1 (fr) * 2004-04-08 2005-10-12 Sanyu Seiki Co. Ltd. Procédé et dispositif de coulée continue horizontale de brame en magnésium ou d'alliage à base de magnésium
EP1844880A1 (fr) * 2006-04-12 2007-10-17 So & So Sommerhofer OEG Coulee en bande
CN109604550A (zh) * 2018-12-27 2019-04-12 河南理工大学 一种新型镁合金垂直半连续铸造装置

Also Published As

Publication number Publication date
IL170168A (en) 2010-11-30
BRPI0407886A (pt) 2006-03-01
US20070074846A1 (en) 2007-04-05
SI1599300T1 (sl) 2007-12-31
CA2516038A1 (fr) 2004-09-10
DE602004007628D1 (de) 2007-08-30
EP1599300A1 (fr) 2005-11-30
NO20054099D0 (no) 2005-09-02
AU2004216532B2 (en) 2009-05-07
ES2290675T3 (es) 2008-02-16
NO20054099L (no) 2005-09-20
CN100342996C (zh) 2007-10-17
IS8046A (is) 2005-09-26
PL206578B1 (pl) 2010-08-31
CN1753743A (zh) 2006-03-29
CA2516038C (fr) 2011-05-03
ATE367228T1 (de) 2007-08-15
BRPI0407886B1 (pt) 2012-09-04
DE602004007628T2 (de) 2008-06-05
IS2493B (is) 2009-02-15
AU2004216532A1 (en) 2004-09-10
EP1599300B1 (fr) 2007-07-18
PL378634A1 (pl) 2006-05-15
WO2004076096A1 (fr) 2004-09-10
MXPA05009163A (es) 2006-01-27
JP2007523745A (ja) 2007-08-23
ZA200506448B (en) 2006-04-26

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