EP0150549B1 - Nozzle for continuous casting - Google Patents

Nozzle for continuous casting Download PDF

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Publication number
EP0150549B1
EP0150549B1 EP84300619A EP84300619A EP0150549B1 EP 0150549 B1 EP0150549 B1 EP 0150549B1 EP 84300619 A EP84300619 A EP 84300619A EP 84300619 A EP84300619 A EP 84300619A EP 0150549 B1 EP0150549 B1 EP 0150549B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
continuous casting
gas
nozzle body
wall
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
Application number
EP84300619A
Other languages
German (de)
French (fr)
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EP0150549A1 (en
Inventor
Masanao Kondo
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.)
Akechi Ceramics Co Ltd
Original Assignee
Akechi Ceramics Co 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 Akechi Ceramics Co Ltd filed Critical Akechi Ceramics Co Ltd
Priority to DE1984300619 priority Critical patent/DE150549T1/en
Priority to EP84300619A priority patent/EP0150549B1/en
Priority to DE8484300619T priority patent/DE3478904D1/en
Priority claimed from AU24068/84A external-priority patent/AU561699B2/en
Publication of EP0150549A1 publication Critical patent/EP0150549A1/en
Application granted granted Critical
Publication of EP0150549B1 publication Critical patent/EP0150549B1/en
Expired 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
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • This invention relates to a nozzle for continuous casting.
  • an example of this kind of nozzle has an annular gap formed in a wall thereof, said gap forming a gas pressure balance chamber 2 which is connected via a gas inlet hole 3 to an inert gas supply source disposed outside the nozzle body 1 whilst communicating with the inner surface of the nozzle body via open pores existing therein, whereby the inert gas is made to blow into the space between the inner wall surface and the molten steel.
  • a gap is made by using a solid material such as will disappear during the burning process for manufacturing a nozzle, for example, paper, polypropyrene, nylon paraffin, etc.
  • the gap is made by providing said material in an appropriate place inside the nozzle body wall at the time of moulding and thereafter burning it away.
  • the open pores which communicate the gas pressure balance chamber 2 with the inner surface of the nozzle are naturally formed during the nozzle manufacturing process so that the existence of the open pores is not always uniform and varies according to the manufacturing conditions. Therefore, there has arisen a problem that the amount of gas supplied to the inner surface is not constant or uniform. In particular, when the number of open pores of less than 5 pm in diameter present is more than 50% in the prior art nozzle, it is practically difficult to blow in the gas and impossible to form a perfect gas seal.
  • FIG. 11 and 12 of WO 84/04893 an Article 54(3) document, from which the single claim starts, in which gas is introduced from the exterior into an annular gap in the wall thereof and thence into the nozzle interior through an array of holes having a diameter between 0.2 and 0.5 mm.
  • An object of the invention is to provide an improved gas blow-in type nozzle for continuous casting in which the foregoing disadvantages are alleviated or avoided, the nozzle of the invention leading to improved uniformity of gas supply to the nozzle inner wall and having a reduced tendency to clogging.
  • each hole through which the pressure balance chamber communicates with the inner wall surface of the passageway has an area corresponding to that of a circular hole having a diameter of 0.03 to 0.05 mm., and the nozzle body has a maximum porosity of 20% whilst containing at least 50% of open pores each having a maximum diameter of 5 pm.
  • a nozzle body 10 has a slit-form gap or gas pressure balance chamber 11 which is disposed in an appropriate place inside the nozzle body 10.
  • a gas inlet hole 12 is formed inside the nozzle body 10 so as to connect the gas pressure balance chamber 11 to an inert gas supply source disposed outside the nozzle.
  • Numeral 13 indicates a slag line portion.
  • a plurality of communication holes 14 are formed in the longitudinal and diametrical directions of the nozzle body 10 at appropriate intervals so as to communicate the gas pressure balance chamber to the inner wall surface of the nozzle body 10. Each communication hole is 0.03 to 0.5 mm in diameter depending upon the penetration of the molten steel to the communication hole 14 when the inert gas is not blown in.
  • the best-suited sectional shape of the communication hole is a circular one for the purpose of preventing the occurrence of the structural defects of the nozzle, but of course it is to be noted that the sectional shape of the communication hole 14 must not be limited thereto and may be in any shape whatever as long as the area of the hole corresponds to that of a circular hole within the scope of the aforementioned size.
  • the present invention is most effective when the nozzle body is mainly made of generally known natural graphite and various kind of alumina, sintered alumina, a-alumina, P-atumina, high-alumina materials (mullite, sillimanite, etc.) and chemically composed of 10% to 40% carbon, 40% to 80% alumina and 20% or less silica, etc., with the use of synthetic resin bond as a bonding agent.
  • the present nozzle When simultaneously using the two immersion nozzles shown in Table 1 for pouring AI-killed steel of Sol-Al 0.070% with ladle having a capacity of 250 ton, the present nozzle was capable of perfectly pouring eight ladles without any adhesion of A1 2 0 3 while the conventional nozzle was adhered with A1 2 0 3 when it poured five ladles and incapable of further casting. Thus the remarkable effects of the present nozzle have been confirmed.
  • the present nozzle When simultaneously using the two immersion nozzles shown in Table 2 for pouring AI-killed steel of Sol-AI 0.05% with ladle having a capacity of 300 ton, the present nozzle was capable of perfectly pouring seven ladles without any adhesion of AI 2 0 3 while the conventional nozzle was adhered with Al 2 O 3 when it poured four ladles and incapable of further casting. Thus the remarkable effects of the present nozzle have been confirmed.
  • the immersion nozzle according to the present invention was capable of continuous casting without clogging up, as compared with the conventional one.

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

Description

  • This invention relates to a nozzle for continuous casting.
  • Hitherto a gas blow-in type nozzle for continuous casting has been known wherein an inert gas is blown in to an inner surface of the nozzle through the nozzle body so as to form a gas seal on the inner wall surface and prevent the nozzle from clogging.
  • As shown in Figures 1 and 2 of the accompanying drawings, an example of this kind of nozzle has an annular gap formed in a wall thereof, said gap forming a gas pressure balance chamber 2 which is connected via a gas inlet hole 3 to an inert gas supply source disposed outside the nozzle body 1 whilst communicating with the inner surface of the nozzle body via open pores existing therein, whereby the inert gas is made to blow into the space between the inner wall surface and the molten steel. Such a gap is made by using a solid material such as will disappear during the burning process for manufacturing a nozzle, for example, paper, polypropyrene, nylon paraffin, etc. The gap is made by providing said material in an appropriate place inside the nozzle body wall at the time of moulding and thereafter burning it away.
  • Another example of the aforesaid kind of nozzle having an annular gap formed in a wall thereof into which gas is introduced via a passage communicating with the exterior, is disclosed in DE-A-2822518.
  • The open pores which communicate the gas pressure balance chamber 2 with the inner surface of the nozzle are naturally formed during the nozzle manufacturing process so that the existence of the open pores is not always uniform and varies according to the manufacturing conditions. Therefore, there has arisen a problem that the amount of gas supplied to the inner surface is not constant or uniform. In particular, when the number of open pores of less than 5 pm in diameter present is more than 50% in the prior art nozzle, it is practically difficult to blow in the gas and impossible to form a perfect gas seal.
  • A further prior nozzle of the aforesaid general kind is shown in Figures 11 and 12 of WO 84/04893, an Article 54(3) document, from which the single claim starts, in which gas is introduced from the exterior into an annular gap in the wall thereof and thence into the nozzle interior through an array of holes having a diameter between 0.2 and 0.5 mm.
  • An object of the invention is to provide an improved gas blow-in type nozzle for continuous casting in which the foregoing disadvantages are alleviated or avoided, the nozzle of the invention leading to improved uniformity of gas supply to the nozzle inner wall and having a reduced tendency to clogging.
  • In the nozzle of the invention, each hole through which the pressure balance chamber communicates with the inner wall surface of the passageway has an area corresponding to that of a circular hole having a diameter of 0.03 to 0.05 mm., and the nozzle body has a maximum porosity of 20% whilst containing at least 50% of open pores each having a maximum diameter of 5 pm.
  • In the accompanying drawings,
    • Figures 1 and 2 are vertical sectional views showing conventional nozzles, and
    • Figures 3 and 4 are vertical sectional views showing, by way of example, nozzles according to the present invention.
    Detailed Description of the Embodiments
  • Referring to Figs. 3 and 4, a nozzle body 10 has a slit-form gap or gas pressure balance chamber 11 which is disposed in an appropriate place inside the nozzle body 10. A gas inlet hole 12 is formed inside the nozzle body 10 so as to connect the gas pressure balance chamber 11 to an inert gas supply source disposed outside the nozzle. Numeral 13 indicates a slag line portion. A plurality of communication holes 14 are formed in the longitudinal and diametrical directions of the nozzle body 10 at appropriate intervals so as to communicate the gas pressure balance chamber to the inner wall surface of the nozzle body 10. Each communication hole is 0.03 to 0.5 mm in diameter depending upon the penetration of the molten steel to the communication hole 14 when the inert gas is not blown in. The best-suited sectional shape of the communication hole is a circular one for the purpose of preventing the occurrence of the structural defects of the nozzle, but of course it is to be noted that the sectional shape of the communication hole 14 must not be limited thereto and may be in any shape whatever as long as the area of the hole corresponds to that of a circular hole within the scope of the aforementioned size. The present invention is most effective when the nozzle body is mainly made of generally known natural graphite and various kind of alumina, sintered alumina, a-alumina, P-atumina, high-alumina materials (mullite, sillimanite, etc.) and chemically composed of 10% to 40% carbon, 40% to 80% alumina and 20% or less silica, etc., with the use of synthetic resin bond as a bonding agent.
  • The present invention will be explained hereinbelow with reference to the preferable examples.
    Figure imgb0001
    Figure imgb0002
    • Example 1
  • When simultaneously using the two immersion nozzles shown in Table 1 for pouring AI-killed steel of Sol-Al 0.070% with ladle having a capacity of 250 ton, the present nozzle was capable of perfectly pouring eight ladles without any adhesion of A1203 while the conventional nozzle was adhered with A1203 when it poured five ladles and incapable of further casting. Thus the remarkable effects of the present nozzle have been confirmed.
    • Example 2
  • When simultaneously using the two immersion nozzles shown in Table 2 for pouring AI-killed steel of Sol-AI 0.05% with ladle having a capacity of 300 ton, the present nozzle was capable of perfectly pouring seven ladles without any adhesion of AI203 while the conventional nozzle was adhered with Al2O3 when it poured four ladles and incapable of further casting. Thus the remarkable effects of the present nozzle have been confirmed.
  • As seen from the above, the immersion nozzle according to the present invention was capable of continuous casting without clogging up, as compared with the conventional one.

Claims (1)

  1. A nozzle for continuous casting comprising a nozzle body (10) having a wall defining a central passageway, and a gas pressure balance chamber (11) formed in said wall and communicating with the exterior via a passage (12), said chamber (11) communicating with the inner wall surface of the passageway by way of a plurality of holes (14), wherein each hole (14) has an area corresponding to that of a circular hole having a diameter of 0.03 to 0.5 mm., and said nozzle body (10) has a maximum porosity of 20% and contains at least 50% of open pores each having a maximum diameter of 5 µm.
EP84300619A 1984-02-01 1984-02-01 Nozzle for continuous casting Expired EP0150549B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1984300619 DE150549T1 (en) 1984-02-01 1984-02-01 NOZZLE FOR CONTINUOUS CASTING.
EP84300619A EP0150549B1 (en) 1984-02-01 1984-02-01 Nozzle for continuous casting
DE8484300619T DE3478904D1 (en) 1984-02-01 1984-02-01 Nozzle for continuous casting

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP84300619A EP0150549B1 (en) 1984-02-01 1984-02-01 Nozzle for continuous casting
AU24068/84A AU561699B2 (en) 1984-02-03 1984-02-03 Ladle nozzle for the continuous casting of al grain refined steel

Publications (2)

Publication Number Publication Date
EP0150549A1 EP0150549A1 (en) 1985-08-07
EP0150549B1 true EP0150549B1 (en) 1989-07-12

Family

ID=25619243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300619A Expired EP0150549B1 (en) 1984-02-01 1984-02-01 Nozzle for continuous casting

Country Status (1)

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EP (1) EP0150549B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9107281D0 (en) * 1991-04-06 1991-05-22 Thor Ceramics Ltd Stopper
JP2778455B2 (en) * 1993-10-13 1998-07-23 日本鋼管株式会社 Immersion nozzle for continuous casting
JP5317433B2 (en) 2007-06-06 2013-10-16 ローム・アンド・ハース・エレクトロニック・マテリアルズ，エル．エル．シー． Acid gold alloy plating solution

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004893A1 (en) * 1983-06-13 1984-12-20 Vesuvius Crucible Co Continuous casting apparatus and a method of using the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT332579B (en) * 1974-06-25 1976-10-11 Voest Ag CASTING PIPE WITH A FLOOR OPENING FOR CONTINUOUS STRAND STEEL CASTING
DE2822518A1 (en) * 1978-05-23 1979-11-29 Leco Corp Integral ceramic nozzle with gas delivery manifold - for supplying inert gas to permeable bore section surrounded by impermeable body
DE2936480C2 (en) * 1979-09-10 1983-11-03 Akechi Taikarenga K.K., Ena, gifu Refractory material for an immersion nozzle
DE3149399C1 (en) * 1981-12-09 1987-07-09 Mannesmann AG, 4000 Düsseldorf Submerged (immersion) nozzle
DE3216478C2 (en) * 1982-05-03 1985-02-28 Günter Dr.-Ing. 5750 Menden Altland Protective pipe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004893A1 (en) * 1983-06-13 1984-12-20 Vesuvius Crucible Co Continuous casting apparatus and a method of using the same

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