EP0150549A1 - Nozzle for continuous casting - Google Patents

Nozzle for continuous casting Download PDF

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Publication number
EP0150549A1
EP0150549A1 EP84300619A EP84300619A EP0150549A1 EP 0150549 A1 EP0150549 A1 EP 0150549A1 EP 84300619 A EP84300619 A EP 84300619A EP 84300619 A EP84300619 A EP 84300619A EP 0150549 A1 EP0150549 A1 EP 0150549A1
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EP
European Patent Office
Prior art keywords
nozzle
continuous casting
nozzle body
gas
diameter
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.)
Granted
Application number
EP84300619A
Other languages
German (de)
French (fr)
Other versions
EP0150549B1 (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.
  • the 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.
  • this kind of nozzle has a gap which is made by using such solid material as will disappear during the burning process for manufacturing a nozzle, for example, paper, polypropyrene, nylon, paraffin, etc. Namely the gap is made by providing said material in an appropriate place inside the nozzle body at the time of molding and thereafter burning it down.
  • the gap or gas pressure balance chamber 2 is connected via a gas inlet hole 3 to an inert gas supply source disposed outside the nozzle body 1 while being communicated to 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.
  • 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. Especially in case that the open pores of less than 5 um in diameter exist more than 50%, it is practically difficult to blow in the gas and impossible to form a perfect gas seal.
  • 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.
  • the communication hole is 1.0 mm or less in diameter, or preferably the best-suited diameter is 0.03 to 0.5 mm considering 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 square measure 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 kinds of alumina, for example, sintered alumina, d -alumina,/3-alumina, 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.
  • alumina for example, sintered alumina, d -alumina,/3-alumina, high-alumina materials (mullite, sillimanite, etc.) and chemically composed of 10% to 40% carbon, 40% to 80% alumina and 20% or less silica, etc.
  • the present nozzle When simultaneously using the two immersion nozzles shown in Table 1 for pouring Al-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 Al-killed steel of Sol-Al 0.05% with ladle having a capacity of 300 ton, the present nozzle was capable of perfectly pouring seven ladles without any adhesion of A1 2 0 3 while the conventional nozzle was adhered with Al 2 0 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.

Abstract

The present invention relates to a nozzle for continuous casting, and more particularly to a nozzle which is capable of uniformly supplying a required amount of gas to the inner wall surface thereof by providing a plurality of communication holes (14) inside the nozzle body (10) between the inner surface thereof and a gas pressure balance chamber (11) disposed inside the nozzle body (10) so as to communicate said chamber with said inner surface, said communication hole having a square measure corresponding to that of a circular hole having a diameter of 1.0 mm or less.

Description

  • This invention relates to a nozzle for continuous casting.
  • So far, the 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, this kind of nozzle has a gap which is made by using such solid material as will disappear during the burning process for manufacturing a nozzle, for example, paper, polypropyrene, nylon, paraffin, etc. Namely the gap is made by providing said material in an appropriate place inside the nozzle body at the time of molding and thereafter burning it down. The gap or gas pressure balance chamber 2 is connected via a gas inlet hole 3 to an inert gas supply source disposed outside the nozzle body 1 while being communicated to 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. 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. Especially in case that the open pores of less than 5 um in diameter exist more than 50%, it is practically difficult to blow in the gas and impossible to form a perfect gas seal.
    • Summary of the Invention
  • It is an object of the present invention to eliminate the foregoing disadvantages as seen in the conventional gas blow-in type nozzle for continuous casting and to provide a new and useful nozzle capable of uniformly supplying a required amount of gas to the inner wall surface of the nozzle and also capable of continuous casting without clogging the nozzle, by providing a plurality of communication holes in the nozzle body between the gas pressure balance chamber and the inner surface of the nozzle so as to communicate said chamber with said inner surface, said communication hole having a square measure corresponding to that of a circular hole having a diameter of 1.0 mm or less.
    • Brief Description of the Drawings
    • Figs. 1 and 2 are vertical sectional views showing conventional nozzles;
    • Figs. 3 and 4 are vertical sectional views showing 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. The communication hole is 1.0 mm or less in diameter, or preferably the best-suited diameter is 0.03 to 0.5 mm considering 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 square measure 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 kinds of alumina, for example, sintered alumina, d -alumina,/3-alumina, 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
    • Example 1
  • When simultaneously using the two immersion nozzles shown in Table 1 for pouring Al-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 Al-killed steel of Sol-Al 0.05% with ladle having a capacity of 300 ton, the present nozzle was capable of perfectly pouring seven ladles without any adhesion of A1203 while the conventional nozzle was adhered with Al203 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 (3)

1. A nozzle for continuous casting characterised by a gas pressure balance chamber (11) which is formed annularly inside the nozzle body (10) and connected to the outside thereof, said gas pressure balance chamber (11) being communicated to the inner wall surface of the nozzle by means of a plurality of communication holes (14) each having a square measure corresponding to a circular hole having a diameter of 1.0 mm or less.
2. A nozzle for continuous casting as claimed in Claim 1 characterised in that said nozzle body (10) has 20% or less porosity and contains 50% or more open pores each having a diameter of 5 um or less.
3. A nozzle for continuous casting as claimed in Claim 1 or 2 characterised in that said communication hole (14) has a square measure corresponding to a circular hole having a diameter of 0.03 to 0.5 mm.
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 true EP0150549A1 (en) 1985-08-07
EP0150549B1 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254274A (en) * 1991-04-06 1992-10-07 Thor Ceramics Ltd Stopper for controlling metal flow from a vessel and delivering gas
EP0648561A1 (en) * 1993-10-13 1995-04-19 Nkk Corporation Immersion nozzle for continuous casting
US9297087B2 (en) 2007-06-06 2016-03-29 Rohm And Haas Electronic Materials Llc Acidic gold alloy plating solution

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2527585A1 (en) * 1974-06-25 1976-01-15 Voest Ag CURRENT 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
DE2936480B1 (en) * 1979-09-10 1981-01-29 Akechi Taikarenga Kk Refractory material for a diving spout
DE3216478A1 (en) * 1982-05-03 1983-11-10 Günter Dr.-Ing. 5750 Menden Altland USE OF A SUBMERSIBLE TUBE IN CONTINUOUS CASTING PLANTS
DE3149399C1 (en) * 1981-12-09 1987-07-09 Mannesmann AG, 4000 Düsseldorf Submerged (immersion) nozzle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145715A1 (en) * 1983-06-13 1985-06-26 Vesuvius Crucible Company Continuous casting apparatus and a method of using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2527585A1 (en) * 1974-06-25 1976-01-15 Voest Ag CURRENT 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
DE2936480B1 (en) * 1979-09-10 1981-01-29 Akechi Taikarenga Kk Refractory material for a diving spout
DE3149399C1 (en) * 1981-12-09 1987-07-09 Mannesmann AG, 4000 Düsseldorf Submerged (immersion) nozzle
DE3216478A1 (en) * 1982-05-03 1983-11-10 Günter Dr.-Ing. 5750 Menden Altland USE OF A SUBMERSIBLE TUBE IN CONTINUOUS CASTING PLANTS

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254274A (en) * 1991-04-06 1992-10-07 Thor Ceramics Ltd Stopper for controlling metal flow from a vessel and delivering gas
GB2254274B (en) * 1991-04-06 1994-11-30 Thor Ceramics Ltd Restricted flow stopper
EP0648561A1 (en) * 1993-10-13 1995-04-19 Nkk Corporation Immersion nozzle for continuous casting
US5501430A (en) * 1993-10-13 1996-03-26 Nkk Corporation Immersion nozzle for continuous casting
US9297087B2 (en) 2007-06-06 2016-03-29 Rohm And Haas Electronic Materials Llc Acidic gold alloy plating solution
US9303326B2 (en) 2007-06-06 2016-04-05 Rohm And Haas Electronic Materials Llc Acidic gold alloy plating solution

Also Published As

Publication number Publication date
EP0150549B1 (en) 1989-07-12

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