EP3753649B1 - Verteilergefaessbarriere - Google Patents

Verteilergefaessbarriere Download PDF

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Publication number
EP3753649B1
EP3753649B1 EP19181629.7A EP19181629A EP3753649B1 EP 3753649 B1 EP3753649 B1 EP 3753649B1 EP 19181629 A EP19181629 A EP 19181629A EP 3753649 B1 EP3753649 B1 EP 3753649B1
Authority
EP
European Patent Office
Prior art keywords
metal
dam
tundish
steel
casting
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.)
Active
Application number
EP19181629.7A
Other languages
English (en)
French (fr)
Other versions
EP3753649C0 (de
EP3753649A1 (de
Inventor
Michael Carr
Katy MOSS
Brian Speight
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.)
Trent Refractories Ltd
Original Assignee
Trent Refractories Ltd
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 Trent Refractories Ltd filed Critical Trent Refractories Ltd
Priority to EP19181629.7A priority Critical patent/EP3753649B1/de
Priority to ES19181629T priority patent/ES2952971T3/es
Publication of EP3753649A1 publication Critical patent/EP3753649A1/de
Application granted granted Critical
Publication of EP3753649C0 publication Critical patent/EP3753649C0/de
Publication of EP3753649B1 publication Critical patent/EP3753649B1/de
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Anticipated expiration legal-status Critical

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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
    • B22D11/116—Refining the metal
    • B22D11/118—Refining the metal by circulating the metal under, over or around weirs
    • 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
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal

Definitions

  • This invention relates to a dam for insertion into a tundish for metals casting to control the flow of liquid metal in the tundish during the casting operation, to a tundish incorporating at least one such dam, and to a method of casting metal using the tundish.
  • a tundish In the continuous casting of steel a tundish is used between the ladle supplying liquid steel and the mould in order to regulate the flow of metal.
  • the tundish consists of a refractory lined open container (although a refractory lid may be provided) into which the steel is poured from the ladle and from which steel flows to the continuous casting mould(s) through one or more outlets, which may have stoppers or gates to control metal flow.
  • the tundish evens out the steel flow and allows contaminating inclusions to be retained, rather than flowing into the casting. Dams or weirs may be installed in the tundish to modify and control the flow of steel in the tundish. By increasing residence time and reducing velocity, the inclusion separation capacity of the tundish is increased, thereby improving the quality of the cast steel.
  • a known dam comprises a body of refractory material having opposed faces in contact with the liquid metal in use, opposed side edges and a lower edge, the side and lower edges engaging inner surfaces of the tundish in use.
  • a negative aspect of the use of dams is that they prevent the discharge of all the steel in the tundish, so that at the end of the operation, there may be pockets of steel that are not discharged into the mould, but instead solidify in the tundish and therefore require reprocessing, adding significantly to the cost of production.
  • CN202377519U discloses the use of a piece of right-angled section steel baffle to block a bottom square hole in the dam during pouring of the steel, the steel baffle eventually melting to allow flow of molten steel through the hole.
  • CN208528079U discloses a dam having holes therethrough, each blocked by a barrier steel plate to block impurities.
  • JP01107950 also discloses the use of metal plugging plates which melt to release the molten metal from the metal-receiving part of the tundish below the level of the molten slag.
  • the dam of the invention is characterised by the metal plate being anchored in the dam by means of a plurality of projections on or adjacent to the side and upper edge of the plate, the projections being embedded in the refractory material.
  • composition of the plate is suitably chosen according to the temperature and chemistry of the molten metal to ensure compatibility with the process.
  • the aperture may extend to the lower edge of the dam.
  • the metal plate has a thickness such that, when exposed to the liquid metal, the plate maintains closure of the aperture until the filling of the tundish is completed.
  • a plate thickness of at least 12mm has been found to be suitable.
  • the aperture suitably represents about 5% to 20% of the area of the face of the dam, for example 7-8%.
  • the metal plate comprises a plurality of projections on or adjacent to the sides and upper edge thereof to anchor the plate in the refractory material.
  • the projections may comprise V-shaped members welded to the face of the plate at the foot of the V.
  • the metal plate may be located in a mould during formation of the dam in such a manner that the projections are engulfed by refractory cement mix as it fills the mould. After hardening of the refractory mix, the projections are thus embedded in the refractory, securing the metal plate in position.
  • the invention also provides a tundish for use in the casting of metal, comprising a refractory lined container having an inlet zone therein for receiving poured molten metal and an outlet for discharging the molten metal into a casting mould, the tundish having located therein between the inlet zone and the outlet at least one dam according to the invention.
  • the invention further provides method of casting metal comprising pouring molten metal into the inlet zone of the tundish of the invention and discharging the molten metal from the outlet into a casting mould, wherein after pouring of the metal has been completed the discharge of metal is continued until the metal in the inlet zone has flowed through the apertures in the dams to reach the outlet.
  • the invention offers significant cost savings, as less metal requires reprocessing; the reduction in energy consumption also offers environmental benefits.
  • the molten steel is introduced into the tundish 1 adjacent to one end thereof and discharged into the continuous casting mould through an outlet 3 adjacent to the opposite end. While the outlet 3 is shown as a simple hole, means may be provided to control the outlet flow, for example a stopper or an outlet gate.
  • the tundish includes two dams 4 by way of example, but it will be appreciated that in practice the number and positioning of the dams will depend on the size of the tundish and the placement and number of the outlets - there may be more than one outlet for some casting operations. For example, a common tundish may feed more than one mould.
  • a dam 20 in accordance with the invention consists of a body 21 of refractory material provided with a pair of steel loops 22 in the upper edge thereof for use in lifting the dam 20 into position in a tundish.
  • An aperture 23 is formed in the dam 20 centrally of the lower edge 24 thereof and extending from one face of the dam to the other. However, the aperture 23 is closed off by a steel plate 25 which is mounted in a recess 26 in the rear face of the dam and is held in place by anchors embedded in the refractory material, as hereinafter described with reference to Figure 7 .
  • the dam is formed with one chamfered side edge 27.
  • This is to accommodate installation in a tundish having a tapered configuration, with steel being poured into a central section of maximum width and then flowing to a plurality of outlets on either side thereof, the width reducing away from the central portion in each direction. Dams will be introduced between the central portion and the outlets on either side thereof, and between adjacent outlets.
  • One longitudinal wall of the tundish will be straight, while the opposite walls will be obliquely angled relative to the longitudinal axis of the tundish.
  • the chamfered edge 27 of each dam 20 will thus fit against the angled wall, the opposite edge engaging the straight wall. It will be appreciated that other configurations of tundish may be used, with the design of the dam being adjusted accordingly.
  • the liquid steel is poured into the tundish from the ladle at an inlet zone (which is the point of maximum turbulence) and then overflows the dams 20 when sufficient steel has been introduced, flowing to the outlet(s) from the tundish in a more controlled manner.
  • the contact of the liquid steel with the steel plates 25 in the dams 20 eventually causes the plates to soften and then melt, thereby opening the aperture to flow of steel as well.
  • the plates are selected so that they have a thickness sufficient to delay melting and opening of the apertures until after linear flow of steel to the outlet(s) has been established.
  • a thickness of about 12mm has been found sufficient, with the aperture 23 having an area of approximately 7-8% of the face of the dam so as to provide adequate flow of steel therethrough without compromising the strength of the dam.
  • the residual steel in the tundish can flow through the apertures to the outlet(s) rather than remaining in the tundish inlet zone to solidify as it cools and then requiring reprocessing.
  • Figure 7 shows the steel plate 25 before installation into the dam.
  • the plate is provided with a plurality of anchors 30, each on the form of a V-shape formed from steel rod and welded to the face of the plate at locations around three edges thereof, i.e. the top and the two sides.
  • the steel plate 25 is located in a mould with the anchors 30 facing inwardly of the mould and the plate defining the recess 26.
  • a refractory concrete mix is then poured into the mould and allowed to harden with the anchors 30 embedded within the refractory material.
  • dam of the invention may be used in a tundish used for the casting of other metals, with the metal plate in the dam being constructed from the same metal as is to be cast.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (8)

  1. Damm zum Einsetzen in einen Verteiler zur Verwendung beim Metallgießen, umfassend einen Körper (21) aus feuerfestem Material mit gegenüberliegenden Flächen, die bei Verwendung in Kontakt mit dem flüssigen Metall stehen, gegenüberliegenden Seitenkanten und einer Unterkante (24), wobei die Seiten- und Unterkanten bei Verwendung mit Innenflächen des Verteilers in Eingriff stehen, einer Öffnung (23), die sich zwischen den gegenüberliegenden Flächen in einem unteren Abschnitt desselben erstreckt, wobei die Öffnung durch eine Metallplatte (25) verschlossen ist, dadurch gekennzeichnet, dass die Metallplatte (25) in dem Damm verankert ist mittels einer Vielzahl von Vorsprüngen (30) an oder neben der Seiten- oder Oberkante der Platte, wobei die Vorsprünge (30) in das feuerfeste Material (21) eingebettet sind.
  2. Damm nach Anspruch 1, wobei sich die Öffnung (23) bis zur Unterkante (24) des Damms erstreckt.
  3. Damm nach Anspruch 1 oder 2, wobei die Metallplatte (25) aus Stahl besteht und eine Dicke von mindestens 12 mm aufweist.
  4. Damm nach einem der vorhergehenden Ansprüche, wobei die Öffnung (23) 5 % bis 20 % der Fläche der Dammoberfläche ausmacht.
  5. Damm nach einem der vorhergehenden Ansprüche, wobei die Metallplatte (25) in einer Ausnehmung (26) angeordnet ist, welche die Öffnung (23) umgibt.
  6. Damm nach einem der vorhergehenden Ansprüche, wobei die Vorsprünge V-förmige Elemente (30) umfassen, die jeweils am Fuß des V mit der Platte verschweißt sind.
  7. Verteiler zur Verwendung beim Metallgießen, umfassend einen feuerfest ausgekleideten Behälter mit einem Einlassbereich zur Aufnahme von gegossenem geschmolzenem Metall und einem Auslass zum Ablassen des geschmolzenen Metalls in eine Gussform, wobei der Verteiler zwischen dem Einlassbereich und dem Auslass mindestens einen Damm nach einem der vorangehenden Ansprüche aufweist.
  8. Verfahren zum Metallgießen, bei dem geschmolzenes Metall in den Einlassbereich eines Verteilers nach Anspruch 7 gegossen wird und das geschmolzene Metall aus dem Auslass in eine Gussform ausgetragen wird, wobei nach Beendigung des Gießens des Metalls der Austrag des Metalls fortgesetzt wird, bis das Metall in der Einlasszone durch die Öffnungen in den Dämmen geflossen ist, um den Auslass zu erreichen.
EP19181629.7A 2019-06-21 2019-06-21 Verteilergefaessbarriere Active EP3753649B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19181629.7A EP3753649B1 (de) 2019-06-21 2019-06-21 Verteilergefaessbarriere
ES19181629T ES2952971T3 (es) 2019-06-21 2019-06-21 Dique de cucharón

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19181629.7A EP3753649B1 (de) 2019-06-21 2019-06-21 Verteilergefaessbarriere

Publications (3)

Publication Number Publication Date
EP3753649A1 EP3753649A1 (de) 2020-12-23
EP3753649C0 EP3753649C0 (de) 2023-07-19
EP3753649B1 true EP3753649B1 (de) 2023-07-19

Family

ID=67001608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19181629.7A Active EP3753649B1 (de) 2019-06-21 2019-06-21 Verteilergefaessbarriere

Country Status (2)

Country Link
EP (1) EP3753649B1 (de)
ES (1) ES2952971T3 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01107950A (ja) * 1987-10-21 1989-04-25 Nkk Corp 水平連続鋳造用タンデイッシュ
US5332416A (en) * 1992-04-23 1994-07-26 Allegheny Ludlum Corporation Method for separating slag and nonmetallic particles during molten metal teeming operations using meltable dam
CN202377519U (zh) * 2011-11-23 2012-08-15 福建三钢闽光股份有限公司 板坯中间包内控流带直角挡流板的挡渣堰
CN208528079U (zh) * 2018-06-19 2019-02-22 上海利尔耐火材料有限公司 一种连铸中间包挡渣坝

Also Published As

Publication number Publication date
EP3753649C0 (de) 2023-07-19
EP3753649A1 (de) 2020-12-23
ES2952971T3 (es) 2023-11-07

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