EP0186852B2 - Zwischengefäss für das Stranggiessen von Automatenstahl - Google Patents

Zwischengefäss für das Stranggiessen von Automatenstahl Download PDF

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Publication number
EP0186852B2
EP0186852B2 EP85116118A EP85116118A EP0186852B2 EP 0186852 B2 EP0186852 B2 EP 0186852B2 EP 85116118 A EP85116118 A EP 85116118A EP 85116118 A EP85116118 A EP 85116118A EP 0186852 B2 EP0186852 B2 EP 0186852B2
Authority
EP
European Patent Office
Prior art keywords
tundish
molten steel
dam
steel
zone
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.)
Expired - Lifetime
Application number
EP85116118A
Other languages
English (en)
French (fr)
Other versions
EP0186852A2 (de
EP0186852B1 (de
EP0186852A3 (en
Inventor
Kazuo Ishiyama
Masashi Yoshida
Isao Suzuki
Ichiro Kudo
Akira Otaki
Noboru Okuyama
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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
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Priority claimed from JP1984191948U external-priority patent/JPH024755Y2/ja
Priority claimed from JP1985023534U external-priority patent/JPS61152369U/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0186852A2 publication Critical patent/EP0186852A2/de
Publication of EP0186852A3 publication Critical patent/EP0186852A3/en
Application granted granted Critical
Publication of EP0186852B1 publication Critical patent/EP0186852B1/de
Publication of EP0186852B2 publication Critical patent/EP0186852B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/003—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with impact pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • 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
    • B22D11/117—Refining the metal by treating with gases
    • 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

Definitions

  • the present invention relates to a tundish for continuous casting of a free cutting molten steel added with Pb or Bi in order to promote the melting and dispersion thereof according to the preamble of claim 1.
  • a free-cutting steel is produced by adding a machinability element to the molten steel, Pb, Bi, etc. are known as machinability elements.
  • Japan examined patent application (referred to as Kokoku) No. 48(1973)-14524 proposes surrounding the ladle outlet with a dam to prevent the flow of Pb or Bi.
  • Another Japan unexamined utility model application (referred to as Utility Model Kokai) No. 54(1979)-35715 proposes providing the bottom of the tundish with a dam to prevent undissolved alloy and nonmetallic inclusions from flowing into the mold.
  • the methods generally used for adding a low melting alloy, a ferro-alloy or the like into the steel melt are that of adding the alloy to the steel melt being discharged from the steel converter and that of adding it directly into the ladle.
  • a shroud is provided over the whole length of the molten steel flow downwardly from the ladle to the tundish and an inflow-pipe is installed at its forward end for introduction of PB onto the molten steel level in the tundish at an intermediate point of the vertical length of the shroud.
  • a shroud is provided to surround the lower part of the molten steel flowing down from the ladle, and a dam is provided at the lower part thereof as immersed into the molten steel with the tundish.
  • a steel purifying agent is droppingly added within the immersed dam.
  • a prime object of the present invention is to provide a tundish for use in continuous casting in which undissolved Pb and Bi in the molten steel are prevented from flowing into the mold.
  • Another object of the invention is to provide a tundish in which the Pb and Bi dissolution yield is greatly improved by forming a large circulation current of the molten steel so as to control the behaviour of the Pb and Bi.
  • a tundish is provided with a molten steel teeming zone (referred to as teeming zone hereinafter) into which Pb or Bi (referred to as a low melting metal hereinafter) is added.
  • the teeming zone is formed in the middle region of the tundish.
  • a dispersing means which stirs the molten steel so as to promote uniform dispersion of the low melting metal is provided along a runner through which the molten steel runs from the teeming zone to a discharge outlet.
  • an ejector having dispersing capabilities may be provided at the bottom of the tundish from which an inert gas such as Ar, N 2 etc, is ejected to stir the molten steel by gas bubbling action.
  • At least one dam is provided downstream of the dispersing means in order to prevent the low melting metal from flowing into the discharge outlet for the molten steel.
  • a ladle 1 a ladle nozzle 5 and a feed pipe 9 for the low melting metal.
  • the main body 3 of a tundish 2 is provided with a cover 6, and dams 8, 8 are installed downstream in the direction of molten steel flow from gas ejectors 7, 7.
  • the main body 3 is further provided with discharge outlets 10.
  • a teeming zone is formed immediately below the nozzle 5, and a dispersing zone is formed between the gas ejectors 7, 7 and the dams 8, 8.
  • Fig. 3 shows another embodiment of the invention, wherein the main body 3 of the tundish is formed with a projecting part4 (referred to as a T-type tundish hereinafter), and the ladle nozzle 5 is positioned nearly at the centre a of the projecting part 4.
  • the teeming zone is defined by the position a of the ladle nozzle 5 and the projecting part 4, and the dispersion zone is formed between the dams 8, 8 and a single gas ejector 7.
  • Fig. 5 shows another embodiment of the invention, wherein the teeming zone is defined by two inner weirs 12, 12 fixed to the cover 6 so as to enclose the center area of the tundish 2.
  • the molten steel is teemed in the center portion.
  • the reach inner weirs should be long enough to pass into the molten steel but not so long as to reach the base of the tundish.
  • a convex portion 11, high in the middle and tapering off on both sides, is provided within the teeming zone surrounded by the inner weirs.
  • Two outer weirs 13, 13 are suspended from the cover 6 of the tundish outside the teeming zone, and the gas ejectors 7, 7 are positioned in the bottom of the tundish between the inner weirs 12 and the outer weirs 13.
  • the gas used is Ar or N 2 , and the gas ejector is preferably a porous plug.
  • the outer weirs 13 should preferably be about the same length as the inner ones but are still effective even if longer or shorter.
  • dams 8, 8 are provided on the bottom of the tundish outside the outer weirs 13, 13.
  • the height of the dams 8, 8 should be less than the depth of the molten steel.
  • the dispersion means is formed by providing the gas ejectors 7, 7 in the regions defined between the inner weirs 12, 12 and the dams 8, 8.
  • a molten steel discharge outlets 10, 10 are positioned outside the dams 8, 8.
  • the forward tip of the feed pipe 9 is directed to the stream of molten steel passing from the ladle 1 to the tundish 2 and so used to add a low melting metal to the molten steel in the form of a powder.
  • the powder supplied by the feed pipe 9 is entrained by the descending steel stream due to its falling energy.
  • the entrained powder is surrounded by the weirs 12, 12, almost none of it floats upward. It is thus transported by the descending stream of molten steel. While being so transported, the powder becomes well dispersed and dissolved.
  • the action of the convex wall 11 at the bottom of the tundish causes the powder, particularly large undissolved particle thereof to move quickly to the dispersion zone.
  • the molten steel is vigorously stirred by the bubbling action of the gas from the gas ejectors. By such stirring, the powder is dissolved and dispersed in the molten steel.
  • Fig. 7 Another embodiment of the invention is shown in Fig. 7.
  • the nozzle 5 is provided under the ladle 1, and a shroud 14 is provided to extend downward from the cover 6 of the tundish 2 so as to surround the lower part of the nozzle 5.
  • the upper end of the shroud 14 is flush with the cover 6.
  • the feed pipe 9 is provided to open into the space between the ladle nozzle 5 and the shroud 14.
  • the lower end of the shroud 14 is immersed into the molten steel in the tundish.
  • the shroud 14 is of oblong shape in horizontal section and surrounds the ladle nozzle 5. This embodiment has a single gas ejector 7.
  • the optimum dimensions of the shroud fall within the following ranqe.
  • the width A of the shroud should be less than three times the diameter d of the nozzle, the molten steel from the nozzle will splatter on the inside wall of the shroud, increasing the amount of skull adhering thereto and consequently making it impossible to add the powder to the molten steel.
  • the stirring action of the molten steel in the shroud is so reduced that almost no stirring-in of the powder is attained.
  • the depth of immersion C is less than 0.5 times the depth of the molten steel h
  • the molten steel is dispersed out of the shroud in a short time and, and as a result, mixing of the powder into the molten steel is insufficient.
  • the depth of immersion C exceeds 0.8 times the depth of the molten steel h, the solid powder which has been added, stirred and mixed remains in the shroud for a long time, preventing sufficient diffusion of the powder into the tundish.
  • the molten steel stream from the nozzle is vigorously stirred within the shroud 14. Therefore, when the powder is added thereto, it is mixed and dispersed in the stirred stream of molten steel, and thereafter the molten steel is dispersed from the bottom of the shroud to the left and right regions of the tundish 2.
  • Fig. 10, 11 depict a tundish of the type shown in Fig. 7 for use with one strand.
  • Numerals 7-1, 7-2 and 7-3 designate gas ejectors.
  • FIG. 12-15 illustrate further embodiments of this invention.
  • a pair of inner dams 15, 15 and a pair of outer dams 8, 8 are provided on the bottom of the tundish 2.
  • the ladle nozzle 5 is positioned between the inner dams 15, 15, while each outer dam 8 is positioned between one of the inner dams and one of a pair of discharge outlets 10.
  • the inner dams 15, 15 and the outer dams 8, 8 have a length equal to the width of the tundish and are all of approximately the same height. Further, as illustrated in Fig. 12, the height of the dams is less than the depth of the molten steel.
  • Figs 14 to 15 show a T-type tundish to which the principle of the invention is applied.
  • a third inner dam 15 is provided so as to partition off the projecting part 4 of the tundish.
  • A is the height of the inner dams 15, 15 and outer dams 8, 8; B is the distance between each inner dam 15 and the center of the ladle nozzle 5; C is the distance between each outer dam 8 and the center of the ladle nozzle 5; E is the depth of the molten steel; and F is the distance between the center of the ladle nozzle 5 and each discharge outlet 10-1 nearer to the center of the tundish.
  • the height A of the inner and outer dams 15, 15 and 8, 8 is higher than that defined above, the molten steel will be retained for a longer time than required so that the powder once uniformly dispersed in the molten steel will settle and accumulate on the bottom of the tundish. Conversely, if the height A is lower than defined, undissolved powder will flow into the discharge outlets 10-1 and 10-2.
  • Fig. 16 depicts an embodiment in which a gas ejector 7 is provided in the center portion between the dams 8, 8 and passage zones 16, 16 for the low melting metal are provided downstream of the dams 8, 8.
  • the same numerals are used to indicate the same means.
  • tundish bricks which has been in use for a long time and found that Pb or Bi had passed through the joint of the tuyere of the nozzle, the upper tuyere, the lower tuyere and the upper nozzle and their pores, and had flown into the nozzle, resulting in the formation of huge Pb or Bi.
  • Figs. 16, 17 and 18 show the structure of a tundish designed to cope with this phenomenons.
  • a passage zone 16 comprising porous bricks, slotted safety bricks, and a slotted steel jacket is provided downstream of each of a pair of dams.
  • Fig. 19 shows an enlarged view of the passage zone for undissolved powder.
  • This passage zone is provided between an upper nozzle 27 constituting a part of a discharge outlet 10 and the position at which the molten steel is poured into the tundish and comprises porous brick 31, slotted safety brick 32 and a slotted steel jacket 33 instead of wear brick 22, safety brick 23, and a steel jacket 24.
  • the top face of the porous brick 31 is a little lower than the top face of the wear brick 22, while the top face of the wear brick 22 and the coating material 21' thereon are inclined by such an angle that the undissolved powder remaining on the bottom of the tundish will be easily settled into the porous brick 31.
  • the safety brick 32 is fixed in place between the porous brick 31 and the steel jacket 33 by making use of safety brick with upper and lower slots. It is preferred that the steel jacket 33 is positioned at a lower level than the steel jacket 24 so that the undissolved powder which has penetrated between the safety brick 23 and the steel jacket 24 can easily pass therebetween.
  • a pool box 34 for holding the undissolved powder of low melting metal is provided under the steel jacket 33.
  • the penetrating undissolved powder is prevented from moving toward the upper nozzle 27, and is carried to enter the pool box 34 by a steel seal plate 35 provided between the porous brick 31, the safety brick 32, the steel jacket 33 and the upper nozzle 27.
  • the lengths of the porous brick 31, the safety brick 32, and the steel jacket 33 are preferred to be 0.1-1.0 times the width of the tundish around the upper nozzle 27 in the width direction of the tundish.
  • the porous brick 31 may be of the ordinary kind which easily passes gas but is resistant to the penetration of molten steel. The undissolved powder will easily penetrate the porous brick and collect in the pool box.
  • the stream of molten steel from the ladle is prevented from passing directly toward the upper nozzle 27 shown in an enlarged view in Fig. 19 by the shroud 14 and the dams 8, 8 and the undissolved powder segregated from the molten steel settles on the bottom of the tundish.
  • a small aperture is made at the bottom of each dam 8, and the undissolved powder which has settled on the bottom of the tundish passes through the small aperture and moves nearer the upper nozzle 27.
  • the undissolved powder which has passed through the dam 8 is carried to the porous brick 31 along the top face of the inclined coating material 21'. The undissolved powder then passes through the porous brick 31, the safety brick 32 and the steel jacket 33 and is collected in the pool box 34.
  • the steel seal plate 35 for preventing the undissolved powder from being discharged with the molten steel is provided around the upper tuyere 25 and a lower tuyere 26 in order to completely prevent the undissolved powder from entering the upper nozzle 27.
  • the steel seal plate 35 may be positioned between the upper nozzle 27 and the upper and lower tuyeres 25, 26.
  • the undissolved powder For collecting the undissolved powder continuously, it is possible to provide outside heating means on the steel jacket 33 and on the pool box 34. When no heating means are provided, the undissolved powder is collected after completion of casting by removing the pool box 34 from the machine.
  • the top face of the porous plug is positioned at a lower level than the upper tuyere 25 to prevent Pb on the porous brick 31 from overflowing the top face of the tuyere owing to the weak metal flow from the small aperture of the dam 8.
  • Recovery means for the indissolved powder consisting of the inclined coating material 21', the porous brick 31, the safety brick 32, the steel jacket 33, the pool box 34, and the steel seal plate 35 can also be provided with good effect at other positions on the bottom of the tundish.

Claims (6)

1. Zwischengefäß (2) zum Stranggießen eines Automatenstahls mit einer Gießzone für die Stahlschmelze, in die ein niedrigschmelzendes Metall als die Zerspanbarkeit förderndes Element hinzugefügt wird, und einem Damm (8), der in Stromrichtung vor einer Ausläßöffnung angeordnet ist, wobei das niedrigschmelzende Metall, das sich durch den Damm (8) absetzt, an einem Abfließen in die Auslaßöffnung (10) gehindert wird, gekennzeichnet durch mindestens eine als Verteilereinrichtung (7) wirkende Gasdüse, die in dem Fließweg von der Gießzone für die Stahlschmelze zu dem Damm (8) in Stromrichtung vor dem Damm (8) angeordnet ist. so daß eine gleichmäßige Verteilung für das niedrigschmelzende Metall in dem Metall gefördert wird.
2. Zwischengefäß nach Anspruch 1, wobei die Zone für die Stahlschmelze definiert wird durch ein erstes Wehr (12), das in Stromrichtung vor der Verteilereinrichtung (7) angeordnet ist, und wobei die Verteilereinrichtung (7) in Stromrichtung nach dem ersten Wehr (12) und in Stromrichtung vor einem zweiten in Stromrichtung vor dem Damm (8) angeordneten Wehr angeordnet ist.
3. Zwischengefäß nach Anspruch 1 oder 2, wobei am Boden der Gießzone für die Stahlschmelze ein konvexer Mittelabschnitt (11) angeordnet ist, der in Stromrichtung schräg verläuft.
4. Zwischengefäß nach einem der Ansprüche 1 bis 3, mit einer Wand (14), die eine Düse (5) einer Pfanne (1), aus der die Stahlschmelze in das Zwischengefäß fließt, umgibt, wobei die Wand (14) so lang ist, daß sie in die Stahlschmelze eintaucht.
5. Zwischengefäß nach einem der Ansprüche 1 bis 4, wobei der Damm zwei Dämme aufweist, einen inneren Damm (15) und einen äußeren Damm (8), wodurch das sich abgesetzte niedrigschmelzende Metall am Abfließen in die Auslaßöffnung (10) für die Stahlschmelze gehindert wird.
6. Zwischengefäß nach einem der Ansprüche 1 bis 5, wobei eine Durchgangszone für das niedrigschmelzende Metall einen mehrlagigen Aufbau eines porösen Steins (31), eines Schutzsteins (32) mit Schlitz und einer Stahlmanschette (33) mit Schlitz, in der Reihenfolge von der oberen Schicht gesehen, aufweist und in Stromrichtung nach dem Damm angeordnet ist.
EP85116118A 1984-12-18 1985-12-17 Zwischengefäss für das Stranggiessen von Automatenstahl Expired - Lifetime EP0186852B2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP191948/84U 1984-12-18
JP1984191948U JPH024755Y2 (de) 1984-12-18 1984-12-18
JP23534/85U 1985-02-22
JP1985023534U JPS61152369U (de) 1985-02-22 1985-02-22

Publications (4)

Publication Number Publication Date
EP0186852A2 EP0186852A2 (de) 1986-07-09
EP0186852A3 EP0186852A3 (en) 1987-05-06
EP0186852B1 EP0186852B1 (de) 1989-05-17
EP0186852B2 true EP0186852B2 (de) 1992-04-29

Family

ID=26360909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85116118A Expired - Lifetime EP0186852B2 (de) 1984-12-18 1985-12-17 Zwischengefäss für das Stranggiessen von Automatenstahl

Country Status (4)

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EP (1) EP0186852B2 (de)
AU (1) AU559525B2 (de)
DE (1) DE3570194D1 (de)
ES (1) ES8700589A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711429A (en) * 1986-08-29 1987-12-08 Usx Corporation Tundish for mixing alloying elements with molten metal
GB8703717D0 (en) * 1987-02-18 1987-03-25 Injectall Ltd Injecting gas into metal melts
IN168760B (de) * 1987-04-10 1991-06-01 Injectall Ltd
US5004495A (en) * 1990-02-05 1991-04-02 Labate M D Method for producing ultra clean steel
ZA935963B (en) * 1992-12-28 1994-03-15 Inland Steel Co Tundish for molten alloy containing dense undissolved alloying ingredient
FR2756762B1 (fr) * 1996-12-11 1998-12-31 Ugine Savoie Sa Reservoir d'alimentation destine a retenir un metal fondu et notamment un acier
CN103990787B (zh) * 2014-05-16 2016-07-06 莱芜钢铁集团有限公司 一种用于去除连铸中间包内钢液夹杂物的装置及方法
KR101834216B1 (ko) * 2016-06-08 2018-03-05 주식회사 포스코 용융물 처리장치 및 용융물 처리방법
AR109299A1 (es) 2016-08-08 2018-11-14 Vesuvius Crucible Co Placa de impacto

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4814524B1 (de) * 1969-07-28 1973-05-08
DE1945499B2 (de) * 1969-09-09 1973-01-18 Vorrichtung zum abgiessen aluminiumberuhigter staehle im strang und schlacke zur verwendung bei einer solchen vorrichtung
DE2119664B2 (de) * 1971-04-22 1975-01-16 Kloeckner-Werke Ag, 4100 Duisburg Verfahren zum Abtrennen von Al tief 2 O tief 3 -Einschlüssen beim Stranggießen von Stahl im Zwischengefäß
AR206969A1 (es) * 1975-06-17 1976-08-31 Foseco Trading Ag Artesa de colada con vertederos
JPS5431013A (en) * 1977-08-12 1979-03-07 Kawasaki Steel Co Method of adding calcium metal or calcium alloy into molten steel within continuous casting tandish
JPS5814034Y2 (ja) * 1977-08-15 1983-03-18 日本鋼管株式会社 タンデイシュ堰

Also Published As

Publication number Publication date
EP0186852A2 (de) 1986-07-09
ES8700589A1 (es) 1986-10-16
EP0186852B1 (de) 1989-05-17
EP0186852A3 (en) 1987-05-06
DE3570194D1 (en) 1989-06-22
ES550062A0 (es) 1986-10-16
AU5143985A (en) 1986-06-26
AU559525B2 (en) 1987-03-12

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