EP0355940A2 - Lingotière de coulée continue avec insert remplaçable - Google Patents

Lingotière de coulée continue avec insert remplaçable

Info

Publication number
EP0355940A2
EP0355940A2 EP89300988.6A EP89300988A EP0355940A2 EP 0355940 A2 EP0355940 A2 EP 0355940A2 EP 89300988 A EP89300988 A EP 89300988A EP 0355940 A2 EP0355940 A2 EP 0355940A2
Authority
EP
European Patent Office
Prior art keywords
mold
insert
nozzle
break ring
body portion
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.)
Pending
Application number
EP89300988.6A
Other languages
German (de)
English (en)
Other versions
EP0355940A3 (fr
EP0355940A1 (fr
Inventor
Libor F. Rostik
Robert J. Simcoe
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.)
Chaparral Steel Co
Original Assignee
Chaparral Steel Co
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 Chaparral Steel Co filed Critical Chaparral Steel Co
Publication of EP0355940A2 publication Critical patent/EP0355940A2/fr
Publication of EP0355940A1 publication Critical patent/EP0355940A1/fr
Publication of EP0355940A3 publication Critical patent/EP0355940A3/fr
Withdrawn legal-status Critical Current

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Definitions

  • This invention relates to apparatus for the continuous horizontal casting of molten material, particularly metals and metal alloys.
  • the apparatus for this purpose includes a tundish for receiving the molten material to be cast.
  • the tundish has a refractory, horizontally disposed nozzle through which the molten metal leaves the tundish for casting.
  • the nozzle at the end opposite that connected to the tundish is connected to a flow-through continuous casting mold.
  • the continuous casting mold is made of a heat-conducting material, usually copper or copper alloys, and provision is made for circulation of liquid, usually water, to cool the mold. As the molten metal enters the mold and contacts the cooled, interior mold surfaces, it is solidified to form a solidified skin of the molten metal with the interior portion remaining in the molten condition.
  • the thickness of the solidified skin increases progressively along the length of the mold. As this partially solidified or embryo casting leaves the mold, the skin is sufficiently thick to prevent the breakout of molten metal. Thereafter, the embryo, casting is progressively cooled and eventually complete solidification of the casting is achieved.
  • the refractory material of the nozzle which is in contact with the molten metal leaving the tundish is at extremely high temperatures.
  • the mold abutting the refractory nozzle is at significantly lower temperatures. Consequently, it is conventional practice to place on the interior of the mold a break ring to serve as a transition material between the refractory of the nozzle and the heat-conducting material of the cooled mold.
  • the break ring functions to define the point at which the shell of the casting begins to form when the molten metal initially enters the mold. It prevents solidification and hang-up of the metal at the end of the nozzle at the interface of the nozzle and mold.
  • relative oscillation or vibration of the mold and casting is provided longitudinally to facilitate withdrawal of the partially solidified casting from the mold.
  • a solidified metal projection commonly termed a "fin”
  • the break ring prevents the molten metal from freezing within the pores of the refractory material adjacent the continuous casting mold.
  • the break ring prevents damage to the newly formed solidified casting skin at the entry end of the mold.
  • the break ring For this purpose, and particularly in the continuous casting of molten alloys, such as steel, the break ring must have chemical resistance to the steel, high resistance to thermal shock, low thermal conductivity, high resistance to wear and erosion and accurately conform to the surface on which it is mounted.
  • the break ring is conventionally constructed from refractory oxides or nitrides, such as boron nitride, silicon nitride and zirconia, and is machined to the proper contour to achieve the required accurate mounting.
  • the continuous casting mold in typical steel casting operations is of a generally round and / or rectangular configuration to permit the casting of slabs or billets which are subsequently reduced to flat-rolled sheet and strip or long structured products, including bars and beams, respectively.
  • the configuration of the mold may also conform generally with the shape of other products to be cast. Consequently, the interior cross-section of the continuous casting mold must conform to this desired configuration.
  • Each mold due to inaccuracies in. construction will vary somewhat in dimension. Therefore, the break ring requires either machining to very close tolerances to mate with the interior of each continuous casting mold or may be formed integrally with the mold. If the break ring is not accurately dimensioned with respect to the mold interior onto which it is mounted, this will result in the molten metal propagating between the connection of the break ring and the mold interface surface. As discussed herein, this may prevent withdrawal of the casting.
  • the temperature of the molten metal issuing from the nozzle through the continuous casting mold is highest at the entry end of the mold, this end of the mold is subjected to more rapid wear than the remainder of the mold body. Consequently, it is the wear at the mold inlet end that first causes deterioration of the mold sufficient to require replacement thereof. In this instance, the remainder of the mold body is generally not worn to the extent requiring replacement. Also, thermal shock resulting at the interface at the entry end of the mold may cause a crack in the newly formed skin of the casting which remains during progressive solidification. This may result in a site for crack propagation during subsequent rolling.
  • Another object of the invention is to provide a continuous casting mold which can be provided with an integral break ring of non-conductive material more readily than has hitherto been the case.
  • the present invention provides apparatus for the horizontal continuous casting of molten material, including a tundish for receiving a quantity of molten material, such as molten metal and alloys, to be cast, a refractory nozzle providing a molten material outlet from said tundish, and a flow-through mold of heat-conducting material having an inlet end contacting said nozzle for receiving said molten material therefrom and an outlet end for discharging an embryo casting resulting from cooling of said molten material during passage through said mold, characterised in said apparatus including a removable insert comprising said mold inlet end and with one end of said insert contacting said nozzle and an opposite end thereof connected to a body portion of said mold.
  • molten material such as molten metal and alloys
  • the insert may be constructed from a material having higher wear resistance and/or thermal conductivity or controlled thermal conductivity with respect to the body portion of the mold.
  • controlled thermal conductivity the conductivity of the insert may be varied along its length and specifically may increase progressively from the end contacting the nozzle to the opposite end.
  • the body portion of the mold may be constructed from copper or a copper alloy in the conventional manner, with the insert constructed from a material that may be a second copper alloy having higher wear resistance and different or higher thermal conductivity than the copper or copper alloy of the body portion of the mold.
  • the insert material may for example be composite material, ceramic or alloys, such as copper alloy including at least one alloying element providing increased wear resistance and/or thermal conductivity, which alloying elements may include zirconium and silver.
  • the composite material may be for example composites of copper ceramic alloys.
  • the insert may be constructed from a conductive ceramic having higher wear resistance than the body portion of the mold. In this embodiment, the insert may be less conductive than the body portion of the mold.
  • the insert may include a break ring and specifically a non-conductive, ceramic break ring, formed integrally on the insert at the inlet end thereof adjacent the nozzle, without any intermediate bonding layer being provided between the break ring and the insert.
  • the apparatus includes a tundish 12 containing therein a quantity of molten steel 14.
  • a refractory nozzle 16 is connected at an outlet end to the interior of the tundish 12 and at the opposite end to the inlet end of a horizontally disposed, continuous casting mold 18.
  • the mold 18 has a generally round and/or rectangular configuration and constitutes a copper body portion 20 having an interior water circulation chamber 22 communicating with water inlet 24 and water outlet 26. This structure provides for the circulation of water through the chamber to cool the mold.
  • a break ring 30 is provided at the entry end of the mold.
  • the insert 32 in accordance with the embodiment shown in Figure 1, constitutes an alloy containing copper and having higher wear resistance than the copper or copper alloy constituting the body portion 20 of the continuous casting mold. Since the inlet end of the mold is subjected to greater wear than the body portion of the mold because of the higher temperature of the molten metal as it enters the mold and comes into contact with the inlet end thereof, the insert 32 is subject to greater wear and degradation from the molten metal. Since the insert is removable, it may be replaced when it becomes worn, without replacing the body portion of the mold which is subjected to less wear than the entry end of the mold. This results in a more economical casting practice, since the entire mold does not have to be replaced because of wear at the entry end thereof.
  • FIG 2 illustrates an alternate embodiment of the invention.
  • an insert 32 of a conductive ceramic is provided. Integral with the insert 32 is a break ring 34 constructed of a non-conductive ceramic.
  • the integral break ring 34 may be formed by conventional thermal spraying, such as plasma spraying, of the refractory compound onto the refractory of the insert 32.
  • Plasma spraying includes providing a powder charge of the refractory compound to be used in the manufacture of the integral break ring. The powder charge is introduced to a high-temperature gas plasma which melts the particles and sprays them onto the surface to be coated with the refractory compound. Spraying of the refractory compound to deposit the same is achieved by accelerating the molten refractory compound by the plasma arc.
  • break ring 34 is shown having a cross-section of generally rectangular configuration, other cross-sectional shapes may be used and are - well known in the art.
  • the surface of the break ring in contact with the molten metal may be rounded or slanted rather than being at right angles as shown in the embodiment of Figure 2.
  • the break ring may be positioned other than as shown in this Figure. For example, it may be on the outer end surface of the mold adjacent the nozzle.
  • FIG. 1 shows the insert 32 having an integral break ring 36 with the cross-sectional area thereof decreasing progressively from the end thereof contacting the nozzle to the opposite end.
  • the break ring 38 is of uniform cross-section along its entire length by varying the thermal conductivity of the break ring material from end to end thereof by using materials of different thermal conductivity in constructing the break ring. This may be achieved for example by flame spraying the different materials during construction of the break ring.
  • the break ring may be constructed by powder metallurgy techniques where different materials of varying thermal conductivity in powder form are consolidated to form the break ring. Consolidating techniques may include conventional hot isostatic pressing as by the use of a gas pressure vessel, commonly termed an autoclave.
  • break ring is formed integrally with the removable insert 32 prior to the insert being inserted into the mold the provision of the break ring is facilitated as is its replacement. Moreover the insert 32 can be replaced when worn without the need for replacing the body of the mold.
EP19890300988 1988-06-27 1989-02-01 Lingotière de coulée continue avec insert remplaçable Withdrawn EP0355940A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21222688A 1988-06-27 1988-06-27
US212226 1988-06-27

Publications (3)

Publication Number Publication Date
EP0355940A2 true EP0355940A2 (fr) 1990-02-28
EP0355940A1 EP0355940A1 (fr) 1990-02-28
EP0355940A3 EP0355940A3 (fr) 1991-10-30

Family

ID=22790110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890300988 Withdrawn EP0355940A3 (fr) 1988-06-27 1989-02-01 Lingotière de coulée continue avec insert remplaçable

Country Status (3)

Country Link
EP (1) EP0355940A3 (fr)
JP (1) JPH0220644A (fr)
CA (1) CA1323745C (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8914495D0 (en) * 1989-06-23 1989-08-09 Davy Mckee Sheffield Continuous casting apparatus
PT1212159E (pt) * 1999-08-26 2003-10-31 Concast Standard Ag Molde de fundicao para o vazamento continuo de aco em barras brutas e formas de barras pre-laminadas.
CH695210A5 (de) * 2000-12-11 2006-01-31 Concast Ag Kokille zum Stranggiessen einer Stahlschmelze.
US7556084B2 (en) 2006-03-24 2009-07-07 Nucor Corporation Long wear side dams
US8042601B2 (en) * 2006-03-24 2011-10-25 Nucor Corporation Side dam with insert
CN102814477A (zh) * 2012-08-08 2012-12-12 中国重型机械研究院股份公司 一种耐磨的结晶器窄面铜板结构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO115409B (fr) * 1963-06-07 1968-09-30 Aluminum Co Of America
DE2520091A1 (de) * 1975-05-06 1976-11-18 Davy Loewy Ltd Kokille fuer strangguss
JPS60124444A (ja) * 1983-12-07 1985-07-03 Kawasaki Heavy Ind Ltd 連続鋳造用モ−ルド構造
JPS61144244A (ja) * 1984-12-18 1986-07-01 Kawasaki Heavy Ind Ltd 連続鋳造設備
CA1256668A (fr) * 1984-12-28 1989-07-04 Nippon Kokan Kabushiki Kaisha Machine de coulee continu a l'horizontale pour la production de pieces a partir de l'acier en fusion
KR880004873A (ko) * 1986-10-15 1988-06-27 티모티 엔. 비숍 연속주조주형

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