EP0387006A2 - Metallbandgiessvorrichtung mit zwei Seitenplatten - Google Patents

Metallbandgiessvorrichtung mit zwei Seitenplatten Download PDF

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Publication number
EP0387006A2
EP0387006A2 EP90302382A EP90302382A EP0387006A2 EP 0387006 A2 EP0387006 A2 EP 0387006A2 EP 90302382 A EP90302382 A EP 90302382A EP 90302382 A EP90302382 A EP 90302382A EP 0387006 A2 EP0387006 A2 EP 0387006A2
Authority
EP
European Patent Office
Prior art keywords
strip
plate
strips
plates
molten metal
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Withdrawn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
EP90302382A
Other languages
English (en)
French (fr)
Other versions
EP0387006A3 (de
Inventor
Klaus Willi Heyer
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.)
Stelco Inc
Original Assignee
Stelco Inc
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 Stelco Inc filed Critical Stelco Inc
Publication of EP0387006A2 publication Critical patent/EP0387006A2/de
Publication of EP0387006A3 publication Critical patent/EP0387006A3/de
Withdrawn legal-status Critical Current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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • 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
    • B22D11/14—Plants for continuous casting
    • 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
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces

Definitions

  • This invention relates generally to the production of thin steel slabs and strip, and has to do particularly with a process and an apparatus by which such materials can be directly cast.
  • One conventional method of making steel strip is to use the well known continuous casting process to make slabs which may typically be 180 mm to 250 mm thick. These slabs are then put through a hot strip mill where they are rolled down to a thickness of typically 1.8 to 4.8 mm, whereupon they are passed through a cold finishing mill to achieve the final thickness.
  • a major disadvantage of the above-mentioned Japanese development is the fact that the melt has its top surface exposed to the air. Moreover, in the region where the strip is exiting from the continuous casting mold, the upper surface of the molten steel literally "becomes" the top surface of the final cast product. This is very disadvantageous due to the fact that the upper surface of the melt tends to become covered with slag, flux or oxides which are undesirable as inclusions in the top surface of the finished strip. Additionally there are certain fluid flow problems associated with trying to cast from a liquid surface, problems that can contribute to a rough (wavy) solidified surface. The U.S. Rossi patent suffers from the same disadvantage.
  • a strip caster concept utilizing a thermally insulated chamber for containing molten metal, the chamber being in part defined by a flat mold wall from which heat can be withdrawn (for example by water jets).
  • a slot-like outlet is provided from the chamber at one extremity of the wall, and means are provided for pulling formed strip out through the slot-like outlet.
  • the plate can be vibrated at high frequency to eliminate or reduce the sticking of the solidifying steel strip to the water-cooled plate. It will be appreciated that the quality of the strip surface facing the water-cooled plate will be of better quality than the surface of the strip facing the melt.
  • an improvement of the surface of the melt side of the strip is sought by providing a short water-cooled second mold wall of much smaller size than the main plate.
  • the second mold wall is provided adjacent the slot-like outlet of the apparatus, and has the function of solidifying the surface facing the melt, in order to improve its quality.
  • mold powders in the prior proposal represents additional expense. To be economic, mold powder consumption should be about 1/10 of that found with conventional slab casting. Additionally, mold powder could be a potential source of mold powder related strip surface defects (unmelted powder) which would be extremely difficult to remove. A one-­millimeter-deep defect on a ten-millimeter-thick strip represents ten percent of the thickness, whereas the same defect on a 250 mm thick slab represents 0.4 percent of the slab thickness.
  • the caster should produce 125 tons an hour with an excellent surface quality free of mold powder entrapment and stress-­induced surface cracks.
  • the present invention eliminates the short, water-cooled mold plate adjacent the exit from the chamber (thus reducing friction significantly), and proposes to utilize two single-plate molds, immersed in the same or different chambers containing molten metal. Both plates are vibrated in the preferred embodiment, and the two strips being withdrawn along the surface of the two plates are then combined to form one single strip.
  • this invention provides an apparatus for continuously casting thin metal strip, having vessel means for containing molten metal, and a plate defining a mold surface adapted to be disposed in contact with molten metal in said vessel means, means for withdrawing heat from the plate to induce solidification of metal in the form of a strip against the mold surface, and means for continuously withdrawing the strip from the apparatus, characterized in that, the apparatus includes a first plate defining a first mold surface, a second plate defining a second mold surface, each said plate being disposed such that its mold surface contacts molten metal contained in said vessel means, first cooling means controllably withdrawing heat from said first plate, second cooling means for controllably withdrawing heat from said second plate, and withdrawing means for a) continuously withdrawing a first formed strip solidifying at the mold surface of the first plate, b) continuously withdrawing a second formed strip solidifying at the mold surface of the second plate and c) merging the two formed strips together to form a single composite strip.
  • this invention provides a method for the continuous casting of thin metal strip utilizing an apparatus that includes vessel means for containing molten metal, and a plate defining a mold surface disposed in contact with molten metal in said vessel means, the method including withdrawing heat from the plate to induce solidification of metal in the form of a strip against the mold surface, and continuously withdrawing the strip from the apparatus; characterized in that there are provided a first plate and a second plate defining a first mold surface and a second mold surface, both mold surfaces being in contact with molten metal in said vessel means, in that heat is withdrawn from both plates, thus inducing the formation of two strips, and in that both strips are continuously withdrawn and merged together to form a single composite strip.
  • Figure 1 Attention is first directed to Figure 1, in which the prior proposal apparatus is seen to incorporate a tundish 10, a mold apparatus 12 defining a chamber 14 which is defined in part by a primary mold plate 16 extending vertically within the apparatus 12.
  • a nozzle bank 18 is adapted to spray cooling water against the side of the mold plate 16 which is remote from the chamber 14.
  • a secondary mold plate is seen at 20, adjacent but spaced apart from the lower region of the primary mold plate 16. Due to the cooling of the plate 16, the molten metal in chamber 14 solidifies in the form of a strip against the inside surface of the plate 16, from where it can be withdrawn downwardly as a cast strip 22.
  • the secondary mold plate 20 serves to finish the inside surface of the strip.
  • Figures 2 and 3 show two possible arrangements for producing cast strip without the use of a secondary mold plate similar to the plate 20 of Figure 1.
  • a tundish is partially shown at 30, and feeds molten metal under reverse weir 32 into a chamber 34 which is defined in part by a mold plate 36, the reverse side of which can be cooled by a water cooling nozzle bank 38.
  • the strip forms against the inside surface of the plate 36 (that exposed to the melt in the chamber 34), and is withdrawn from the apparatus over a roller 39.
  • Figure 3 shows a similar arrangement of components identified by numerals with the subscript a functioning identically except for the fact that strip is withdrawn in a different direction.
  • the Figure 3 components do not need to be explained in detail, as they are analogous to the equivalent components in Figure 2.
  • the essence of this embodiment of the invention is to provide two single-­plate mold surfaces immersed in a single chamber containing liquid steel or other metal.
  • Each mold surface generates a strip as the molten metal solidifies, and the two strips are withdrawn from the melt and merged or combined together to form one single strip.
  • a tundish 40 is again only partly shown, the tundish being provided with a weir 42 and an outlet 43, the latter communicating with a chamber 45 seen in both Figures 4 and 5.
  • the chamber 45 is defined by a lower wall 46, two end walls 48 and 50, and two similar mold plates 52 and 54, each with a respective cooling water nozzle bank 56, 58.
  • the plates 52 and 54 are oscillated or vibrated at a high frequency, in order to reduce frictional drag between the forming strips and their respective plates.
  • the oscillation may be applied by mechanical means or electronically (e.g. piezoelectric elements).
  • the formed strips are withdrawn by withdrawing rollers 60 and 62, and downstream of these rollers is located a set of reducing rollers 64 which have the effect of slightly reducing the thickness of the composite strip after the two initial strips have been merged together. This reduces minor imperfections and welds any centre porosity.
  • the liquid steel level (67) in the chamber 45 is below the location where the two single strips join into a combined strip.
  • the liquid steel level (67) in the chamber 45 is below the location where the two single strips join into a combined strip.
  • the cavity formed above the molten metal meniscus and between the two strips may be flooded with a substantially inert gas, e.g. nitrogen or argon, in order to prevent reoxidation.
  • a substantially inert gas e.g. nitrogen or argon
  • a tundish partly shown at 70 delivers molten metal through a passageway 72 to a chamber 74 defined within an apparatus 76.
  • the chamber 74 is defined in part by a first mold plate 78 which slopes leftwardly and downwardly, and a second mold plate 80 which slopes leftwardly and upwardly. It is thus seen that the plates 78 and 80 converge in the leftward horizontal direction.
  • the strips 82 and 84 forming on the respective plates also converge in the leftward horizontal direction.
  • a withdrawing means is provided including withdrawing rollers 86 and 88, and these are followed by a compressing roller assembly 90.
  • each plate 78, 80 has a respective cooling water nozzle bank 92 and 94.
  • Figure 7 shows an arrangement very similar to that in Figure 5, with the exception that each of the mold plates 100, 101 is in contact with metal in a different cavity.
  • a first tundish 103 provides liquid metal through an opening 104 to a chamber 106 to which the mold plate 101 is exposed.
  • a second tundish 108 provides molten metal through an opening 110 to a second chamber 112 to which is exposed the mold plate 100.
  • Each of the mold plates 100, 101 is provided with a respective cooling water nozzle bank 114, 116.
  • the two forming strips 118 and 120 are withdrawn by withdrawing rollers 122, and these are followed by a set of compression rollers 124.
  • the respective mold assembly and melt chamber can be attached directly to a tundish, thus preventing the steel or other metal from coming into contact with air when transferring it from the tundish to the mold assembly.
  • This structure avoids the formation of inclusions which have a much more detrimental effect on material properties with strip casting than with regular cast slabs.
  • the tundishes may be provided with the usual flow control devices, e.g. dams, weirs, stirring elements, etc., in order to cleanse the steel before it enters the mold cavity. It will be evident that the tundish should be sealed by either mechanical means or a gas blanket.
  • the various mold plates for the described embodiments may be coated with a layer of a low-friction material such as Boron Nitride.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP19900302382 1989-03-08 1990-03-06 Metallbandgiessvorrichtung mit zwei Seitenplatten Withdrawn EP0387006A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA593117 1989-03-08
CA593117 1989-03-08

Publications (2)

Publication Number Publication Date
EP0387006A2 true EP0387006A2 (de) 1990-09-12
EP0387006A3 EP0387006A3 (de) 1991-08-14

Family

ID=4139745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900302382 Withdrawn EP0387006A3 (de) 1989-03-08 1990-03-06 Metallbandgiessvorrichtung mit zwei Seitenplatten

Country Status (5)

Country Link
EP (1) EP0387006A3 (de)
JP (1) JPH02284744A (de)
KR (1) KR900014056A (de)
CN (1) CN1045718A (de)
BR (1) BR9001078A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010000034A1 (en) * 2008-07-03 2010-01-07 Bluescope Steel Limited For continuous strip casting
US9751128B2 (en) 2013-11-26 2017-09-05 Toyota Jidosha Kabushiki Kaisha Pulling-up-type continuous casting apparatus and pulling-up-type continuous casting method
US9931692B2 (en) 2012-11-22 2018-04-03 Toyota Jidosha Kabushiki Kaisha Hoisting type continuous casting device, hoisting type continuous casting method, and solidification interface detection device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5373728B2 (ja) * 2010-09-17 2013-12-18 株式会社豊田中央研究所 自由鋳造方法、自由鋳造装置および鋳物
CN102029364B (zh) * 2010-12-30 2012-12-05 一重集团大连设计研究院有限公司 一种双辊连铸机浇铸系统的隔板装置
KR20160029151A (ko) * 2011-05-27 2016-03-14 에이케이 스틸 프로퍼티즈 인코포레이티드 메니스커스 코팅 장치 및 방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073333A (en) * 1974-12-23 1978-02-14 Korshunov Evgeny Method of continuous casting of ingots
EP0165456A2 (de) * 1984-05-18 1985-12-27 Irving Rossi Verfahren und Vorrichtung zur Herstellung dünner Stahlbrammen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073333A (en) * 1974-12-23 1978-02-14 Korshunov Evgeny Method of continuous casting of ingots
EP0165456A2 (de) * 1984-05-18 1985-12-27 Irving Rossi Verfahren und Vorrichtung zur Herstellung dünner Stahlbrammen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010000034A1 (en) * 2008-07-03 2010-01-07 Bluescope Steel Limited For continuous strip casting
US7984748B2 (en) 2008-07-03 2011-07-26 Nucor Corporation Apparatus for continuous strip casting
US8176969B2 (en) 2008-07-03 2012-05-15 Nucor Corporation Apparatus for continuous strip casting
US9931692B2 (en) 2012-11-22 2018-04-03 Toyota Jidosha Kabushiki Kaisha Hoisting type continuous casting device, hoisting type continuous casting method, and solidification interface detection device
US9751128B2 (en) 2013-11-26 2017-09-05 Toyota Jidosha Kabushiki Kaisha Pulling-up-type continuous casting apparatus and pulling-up-type continuous casting method

Also Published As

Publication number Publication date
BR9001078A (pt) 1991-02-26
CN1045718A (zh) 1990-10-03
EP0387006A3 (de) 1991-08-14
KR900014056A (ko) 1990-10-22
JPH02284744A (ja) 1990-11-22

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