EP0495999A1 - Structure d'interception de l'air utilisee dans des structures ignifuges - Google Patents

Structure d'interception de l'air utilisee dans des structures ignifuges Download PDF

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Publication number
EP0495999A1
EP0495999A1 EP91914198A EP91914198A EP0495999A1 EP 0495999 A1 EP0495999 A1 EP 0495999A1 EP 91914198 A EP91914198 A EP 91914198A EP 91914198 A EP91914198 A EP 91914198A EP 0495999 A1 EP0495999 A1 EP 0495999A1
Authority
EP
European Patent Office
Prior art keywords
air
nozzle
molten steel
fire
venting
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Withdrawn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
EP91914198A
Other languages
German (de)
English (en)
Other versions
EP0495999A4 (en
Inventor
Kiyotaka Krosaki Corporation Toya
Shigeru Krosaki Corporation Hirayama
Hisao Krosaki Corporation Hanada
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.)
Krosaki Corp
Original Assignee
Krosaki 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
Application filed by Krosaki Corp filed Critical Krosaki Corp
Publication of EP0495999A1 publication Critical patent/EP0495999A1/fr
Publication of EP0495999A4 publication Critical patent/EP0495999A4/en
Withdrawn legal-status Critical Current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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/28—Plates 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
    • 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
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection

Definitions

  • This invention relates to an air interceptive structure in a refractory structure, such as a nozzle device for steelmaking, and in particular, a sliding nozzle device used for the treatment of pure steel.
  • the molten steel is received in a ladle, and is continuously cast through a tundish.
  • a casting process in which steel is isolated from open air is called an air-isolated casting process.
  • One air-isolated casting process is carried out by feeding molten steel through a tube called a shroud, or through a submerged nozzle, to prevent it from exposure to open air while it flows down.
  • Japanese Patent Laid-Open Application No. 62-50070 proposes the use of a sliding nozzle device having a wholly closed structure defining a closed atmosphere into which an inert gas, such as argon, is blown
  • Japanese Patent Laid-Open Application No. 61-3653 proposes the evacuation of such a closed chamber.
  • the joints of the shroud or the submerged nozzle are, among other things, so constructed as to make it practically impossible to define a closed environment to prevent the molten steel to be cast from exposure to air.
  • the joints of the refractories forming the shroud or the submerged nozzle are formed by mortar or sealing material, but as the downward flow of the molten steel creates a considerably high negative pressure in the bore of the sliding nozzle device through which the molten steel is caused to flow down, no satisfactory sealing effect can be expected from the mortar or sealing material alone.
  • This invention relates to a structure for intercepting air in a refractory structure comprising refractory materials having a nozzle bore for downward flow of molten steel, in which a groove for venting air is formed around the nozzle bore, and communicated with a passage leading to an outside air venting device.
  • It also provides a simple structure for venting air which comprises one or more passages formed in a member composed of refractory materials and having a nozzle bore, and leading to an outside air venting device, the member having grooves formed around the nozzle bore and communicated with the passages leading to the outside device.
  • the grooves for venting air which are formed in the refractory materials surrounding the nozzle bore work effectively creating a negative pressure in the joints of the refractory materials. Thus, there is no invasion of air into the nozzle bore through the joints of the refractory materials.
  • the nozzle bore defined by plate bricks can be filled with molten steel, if the nozzle bore is placed at a negative pressure which is higher than that which is created by the control of its flow rate, and which is in the level of say, 10 to 70 cm Hg.
  • the use of appropriately shaped bricks enables a considerably high level of reliability in the air-isolated casting of molten steel at low cost, and the connecting holes to which the exhaust grooves formed in the joint surfaces are connected provide a simple device.
  • Fig. 1 shows a sliding nozzle device which is located under an upper nozzle 1 provided at the bottom of a tundish 8, and comprises a stationary upper plate 2, a slidable middle plate 3 and a stationary lower plate 4, and under which a lower nozzle 5 and a submerged nozzle 6 are mounted.
  • each two adjoining refractory structures as described above is provided with at least one U-shaped groove 9 extending about a nozzle bore 7 formed substantially in the center thereof.
  • Figs. 2(a), 2(b) and 2(c) are top plan views of the plates 2, 3 and 4, respectively, as taken along the lines A-A, B-B, and A'-A' or B'-B', respectively, of Fig. 1, and showing the grooves 9 formed therein.
  • the U-shaped grooves are so positioned that the grooves of the stationary upper plate 2 and the slidable middle plate 3 are communicated with each other, while those of the slidable middle plate 3 and the stationary lower plate 4 are also communicated with each other, when molten steel is caused to flow.
  • Fig. 3 shows a circular groove 9 as an example of modification.
  • Each groove 9 is associated with a piece of brick having an exhaust hole 10 and can be evacuated by a vacuum pump mounted outside, though not shown, so that the air tending to invade through the joint between the upper nozzle 1 and the stationary upper plate 2, between the stationary upper plate 2 and the slidable middle plate 3, between the slidable middle plate 3 and the stationary lower plate 4, between the stationary lower plate 4 and the lower nozzle 5, or between the lower nozzle 5 and the submerged nozzle 6 may be drawn out through the exhaust hole 10 which is partially connected to the groove 9 by the vacuum pump before it enters the nozzle bore 7.
  • Figs. 4 and 5 show still more embodiments.
  • Fig. 4 is a top plan view of a slidable middle plate 3 constituting a modified form of the plate structure shown in Fig. 1 or 3, and having a bore connecting grooves 9 with an exhaust hole 10.
  • Fig. 5 is a sectional view of an assembly of the slidable middle plate 3 shown in Fig. 4, and stationary upper and lower plates 2 and 4.
  • the grooves 92 and 93 formed in the stationary upper and lower plates, respectively, and extending about the nozzle bore 7 are communicated with the hole 11 extending through the slidable middle plate 3, and with the passage 10 formed in the stationary upper plate 2 and leading to an outside air venting device, when the slidable middle plate 3 has been caused to slide to open the nozzle bore 7.
  • This structure makes it sufficient to provide only one passage of the nature shown at 10 in Fig. 3, and thereby enables the simplification of the related piping, while a plurality of holes 10 are required of the structure shown in Fig. 1.
  • This invention is applicable not only to a sliding nozzle device comprising three plates as hereinabove described by way of example, but also to a device comprising two plates including a slidable lower plate, or combination of a plate (or plates) and a shroud or a submerged nozzle. Moreover, it is not limited to a sliding nozzle device, but is also applicable to any other nozzle, or pipe, or device for handling molten metal which need be isolated from the open air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

L'invention se rapporte à une structure qui sert à assurer l'interception de l'air dans de l'acier en fusion et qui est utilisée dans une structure ignifuge telle qu'un dispositif à ajutage coulissant comportant un orifice de déversement pour l'acier en fusion. Dans une telle structure ignifuge composée d'un matériau ignifuge dans lequel est ménagé un trou d'ajutage (7) pour l'écoulement descendant de l'acier en fusion, on forme autour du trou d'ajutage une rainure (9) d'évacuation de l'air, cette rainure possédant une structure d'évacuation de l'air qui la met en communication avec un passage (10) conduisant à un dispositif d'évacuation de l'air extérieur. On obtient ainsi une réduction effective de la pression de l'air, qui devient négative au niveau des surfaces de jointures des matériaux ignifuges et on empêche totalement l'air de l'extérieur d'entrer par le trou d'ajutage en traversant les parties de jointure.
EP19910914198 1990-08-10 1991-08-08 Air interceptive structure in fire resistant structure Withdrawn EP0495999A4 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP21209090 1990-08-10
JP2120/90 1990-08-10
JP111950/91 1991-05-16
JP3111950A JPH04228256A (ja) 1990-08-10 1991-05-16 ノズル孔の断気構造

Publications (2)

Publication Number Publication Date
EP0495999A1 true EP0495999A1 (fr) 1992-07-29
EP0495999A4 EP0495999A4 (en) 1992-12-30

Family

ID=26451214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910914198 Withdrawn EP0495999A4 (en) 1990-08-10 1991-08-08 Air interceptive structure in fire resistant structure

Country Status (7)

Country Link
EP (1) EP0495999A4 (fr)
JP (1) JPH04228256A (fr)
KR (1) KR920702265A (fr)
AU (1) AU8317691A (fr)
BR (1) BR9105858A (fr)
CA (1) CA2069297A1 (fr)
WO (1) WO1992002323A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390902A (en) * 1991-05-21 1995-02-21 International Industrial Engineering S.A. Belt for sealing a pouring tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05115964A (ja) * 1991-10-24 1993-05-14 Shinagawa Refract Co Ltd スライドバルブにおける断気方法
KR100775084B1 (ko) * 2006-12-20 2007-11-08 주식회사 포스코 턴디쉬용 단열장치
JP5742992B1 (ja) * 2014-03-13 2015-07-01 品川リフラクトリーズ株式会社 スラブ連続鋳造用装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5083312U (fr) * 1973-11-30 1975-07-17
JPH01309768A (ja) * 1988-06-09 1989-12-14 Kawasaki Steel Corp 溶鋼の無酸化連続鋳造方法および無酸化鋳込装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9202323A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390902A (en) * 1991-05-21 1995-02-21 International Industrial Engineering S.A. Belt for sealing a pouring tube

Also Published As

Publication number Publication date
CA2069297A1 (fr) 1992-02-11
WO1992002323A1 (fr) 1992-02-20
KR920702265A (ko) 1992-09-03
JPH04228256A (ja) 1992-08-18
AU8317691A (en) 1992-03-02
BR9105858A (pt) 1992-09-22
EP0495999A4 (en) 1992-12-30

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