WO2015158439A1 - Busette immergée pour coulée continue - Google Patents

Busette immergée pour coulée continue Download PDF

Info

Publication number
WO2015158439A1
WO2015158439A1 PCT/EP2015/025020 EP2015025020W WO2015158439A1 WO 2015158439 A1 WO2015158439 A1 WO 2015158439A1 EP 2015025020 W EP2015025020 W EP 2015025020W WO 2015158439 A1 WO2015158439 A1 WO 2015158439A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle according
tapered
nozzle
range
tapered part
Prior art date
Application number
PCT/EP2015/025020
Other languages
English (en)
Inventor
Ronald SCHIMMEL
Original Assignee
Tata Steel Ijmuiden B.V.
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 Tata Steel Ijmuiden B.V. filed Critical Tata Steel Ijmuiden B.V.
Priority to EP15722451.0A priority Critical patent/EP3131692B1/fr
Publication of WO2015158439A1 publication Critical patent/WO2015158439A1/fr

Links

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
    • B22D41/50—Pouring-nozzles
    • 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

Definitions

  • the invention relates to a submerged entry nozzle used in the continuous casting of steel to guide the flow of molten steel from the tundish into the mould of a continuous casting apparatus.
  • the submerged entry nozzle with four discharge openings has the advantage that the jets to the deeper part of the mould and the jets in sideward direction and up to the meniscus are separate jets resulting among others in that more heat is brought to the meniscus than with a nozzle with two discharge openings. With more heat at the meniscus the mould powder will melt more easily and completely preventing that inclusions in the cast product will arise.
  • the four jets of molten steel from a nozzle with four discharge openings will also result in four recirculation zones within the steel bath in the mould which will interact with each other and might cause instabilities in the fluid steel in the mould. Such instabilities might have a negative effect on the quality of the cast product.
  • one or more of the objectives of the invention are realized by providing a submerged entry nozzle for use in continuous casting comprising:
  • the distribution zone comprises a main divider which divides the conduit in two secondary channels and secondary dividers which further divide the secondary channels,
  • the distribution zone has a taper seen in downstream direction and perpendicular to an axial plane defined by the longitudinal axis of the secondary channels.
  • the distribution zone has a first tapered part and a second tapered part with the first tapered part upstream of the second tapered part.
  • each secondary channel is divided in a lower channel and upper channel respectively connecting to a lower discharge opening and an upper discharge opening and wherein the second tapered part starts at or near the highest level of the upper discharge openings. It turned out that this second tapered part contributes substantially to the guidance of the flow and therewith to the control of the flow.
  • the second tapered part is limited to the lower channels.
  • These lower channels guide the largest part of the flow and widen in the axial plane defined by the longitudinal axis of the secondary channels and in the direction of the lower discharge openings.
  • the combination of the second taper and the widening of the lower channels provides that the fluid flow remains fully controlled over the entire length of the lower channels.
  • the lower channels are designed to have a flow rate of 60-80% of the total flow rate of the lower and upper channels.
  • the second tapered part is adapted to that flow rate and has a taper ratio in the range of 0.70-0.94 and preferably in the range of 0.76-0.88.
  • the conduit has a straight part followed by a tapered section connecting to the distribution zone and wherein the tapered section widens in downstream direction and parallel to the axial plane defined by the longitudinal axis of the secondary channels.
  • this part of the conduit is divided in the same plane in parts with different tapers wherein the transition to a wider part of the conduit results in a disturbance of the flow and therewith a disturbance in the control of the flow.
  • the tapered section narrows in downstream direction and perpendicular to the direction in which the single tapered part widens with a first and second tapered part, wherein the first tapered part has a larger angle than the second tapered part.
  • the angle of the second tapered part is ⁇ 2° and preferably ⁇ 1°.
  • the tapered section connects in the axial plane with the upper discharge openings with a continuous curvature.
  • This curvature runs in said axial plane from the conduit to the very end of the upper channel, that is the discharge opening.
  • the combination of the curvature and the side of the secondary divider facing the curvature define to a large extent the geometry of the upper channels.
  • the resulting geometry is such that a complete filling of the upper channel is obtained along the whole length of the channel. This in turn results in a well defined yet into the fluid steel in the mould and therewith a good control over recirculation in the mould.
  • the division of the flow in upper and lower channels by means of a main divider and secondary dividers is an important feature in the geometry of the nozzle.
  • the main divider starts below the highest level of the upper discharge openings and that the secondary dividers start below the highest level of the main divider.
  • a further feature is that the secondary dividers seen in the axial plane widen in downstream direction wherein at least one of the sides of one of the secondary dividers has a curvature over part of the length of the side and wherein the side with a curvature is facing a side of the main divider.
  • the curvature continues over a relatively short distance with a radius of curvature that is of the same order as the continuous curvature that runs from the conduit to the very end of the upper channel, that is to the discharge opening, it is an important feature in guiding the flow from the distribution zone into the lower channel.
  • This curvature of the secondary dividers is followed by a straight part up to the lower discharge opening.
  • the straight parts of the sides of each of the secondary dividers enclose an angle in the range of 32-36° and the angle between the side of a secondary divider facing the curvature of the upper discharge opening and the central axis of the nozzle is in the range of 56-60°.
  • This results in a geometry of the lower channels such that a complete filling of the lower channel is obtained along the whole length of the channel. This in turn results in a well defined yet into the fluid steel in the mould and therewith a good control over recirculation in the mould.
  • Fig.1 shows the lower part of the submerged entry nozzle
  • Fig.2 shows the distribution zone with the upper and lower channels in more detail.
  • the lower part of the submerged entry nozzle 1 is shown with part of the tapered section of the conduit 2 connecting to the distribution zone 3.
  • the acute angle between the sides of the tapered section seen in the plane of the drawing enclose an angle in the range of 6-10°.
  • the distribution zone is provided with a main divider 4 dividing the fluid flow in two channels which each are divided by means of secondary dividers 5,6 in upper channels 7,8 with discharge openings 9,10 and lower channels 11,12 with discharge openings 13,14.
  • the sides of the tapered part of the conduit run with a continuous curve 16 to the upper part of the discharge openings 9,10 of upper channels 7,8.
  • the distribution zone 3 is shown in more detail wherein the distribution zone starts at horizontal line 15 with a first tapered part which continues to about the highest level of the discharge openings 9,10 in the upper channels 7,8. From that level a second tapered part starts which continues over part or the complete length of the lower channels 11,12. Preferably the second tapered part continues over only part of the length of the lower channels 11,12 wherein the larger part of the channels 11,12 downstream of the second tapered part have flat opposite sides. Both tapered parts run in a plane perpendicular to the plane of the drawing. The tapered parts are very effective in keeping the distribution zone and the channels well filled with fluid steel.
  • a taper ratio in the range of 0.70 - 0.76 for the first tapered part and in the range of 0.85 - 0.95, preferably in the range of 0.87 - 0.91 for the second tapered part show good results in this respect.
  • the taper ratio's of the first and second tapered part and the length of the first and second tapered parts are preferably tailored such that the first and second tapered part have the same taper angle.
  • the secondary dividers have a straight side 17 facing the continuous curvature 16 and at the opposite side a curvature 18 followed by a straight side 19.
  • the straight sides enclose an angle a which is in the range of 32-36°.
  • the angle ⁇ enclosed by the central axis 20 of the nozzle and straight side 17 of the secondary divider is in the range of 56-60°.
  • the main divider 4 is provided with inclined sides 21,22 connecting to discharge openings 13,14 to prevent that the fluid jets coming from the lower channels 11,12 would merge into another.

Landscapes

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

Abstract

L'invention concerne une busette immergée destinée à être utilisée pour la coulée continue, laquelle busette présente un conduit, une zone de distribution, deux canaux supérieurs et deux canaux inférieurs et des orifices de décharge correspondants, la géométrie de ces parties étant adaptée pour maintenir la busette constamment entièrement remplie d'acier liquide de manière à obtenir un bon contrôle des jets d'acier liquide sortant de la busette.
PCT/EP2015/025020 2014-04-15 2015-04-15 Busette immergée pour coulée continue WO2015158439A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15722451.0A EP3131692B1 (fr) 2014-04-15 2015-04-15 Busette immergée pour coulée continue

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14001365 2014-04-15
EP14001365.7 2014-04-15

Publications (1)

Publication Number Publication Date
WO2015158439A1 true WO2015158439A1 (fr) 2015-10-22

Family

ID=50543414

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/025020 WO2015158439A1 (fr) 2014-04-15 2015-04-15 Busette immergée pour coulée continue

Country Status (2)

Country Link
EP (1) EP3131692B1 (fr)
WO (1) WO2015158439A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2802242C2 (ru) * 2019-05-23 2023-08-23 Везувиус Груп, С.А. Разливочный стакан
WO2024022873A1 (fr) 2022-07-28 2024-02-01 Tata Steel Ijmuiden B.V. Buse d'entrée immergée

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060243418A1 (en) * 2006-01-17 2006-11-02 Nucor Corporation Submerged entry nozzle with installable parts
US20060243760A1 (en) * 2005-04-27 2006-11-02 Mcintosh James L Submerged entry nozzle
US20070241142A1 (en) * 2005-04-27 2007-10-18 Nucor Corporation Submerged entry nozzle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060243760A1 (en) * 2005-04-27 2006-11-02 Mcintosh James L Submerged entry nozzle
US20070241142A1 (en) * 2005-04-27 2007-10-18 Nucor Corporation Submerged entry nozzle
US20060243418A1 (en) * 2006-01-17 2006-11-02 Nucor Corporation Submerged entry nozzle with installable parts

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2802242C2 (ru) * 2019-05-23 2023-08-23 Везувиус Груп, С.А. Разливочный стакан
WO2024022873A1 (fr) 2022-07-28 2024-02-01 Tata Steel Ijmuiden B.V. Buse d'entrée immergée

Also Published As

Publication number Publication date
EP3131692B1 (fr) 2021-10-13
EP3131692A1 (fr) 2017-02-22

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