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EP0235340A1 - Système d'anode pour réchauffage du plasma utilisé dans un panier intermédiaire - Google Patents

Système d'anode pour réchauffage du plasma utilisé dans un panier intermédiaire Download PDF

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Publication number
EP0235340A1
EP0235340A1 EP86103047A EP86103047A EP0235340A1 EP 0235340 A1 EP0235340 A1 EP 0235340A1 EP 86103047 A EP86103047 A EP 86103047A EP 86103047 A EP86103047 A EP 86103047A EP 0235340 A1 EP0235340 A1 EP 0235340A1
Authority
EP
European Patent Office
Prior art keywords
tundish
molten metal
anode system
conductive member
space
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
EP86103047A
Other languages
German (de)
English (en)
Other versions
EP0235340B1 (fr
Inventor
Hiroshi Nippon Steel Corp Hirohata Works Mure
Ryohei Nippon Steel Corp Hirohata Works Mizoguchi
Shinichi Nippon Steel Corp Hirohata Works Yokoi
Shigeru Nippon Steel Corp Hirohata Works Fujihara
Kaoru Nippon Steel Corp Hirohata Works Ichikawa
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
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to DE8686103047T priority Critical patent/DE3666161D1/de
Priority to EP86103047A priority patent/EP0235340B1/fr
Publication of EP0235340A1 publication Critical patent/EP0235340A1/fr
Application granted granted Critical
Publication of EP0235340B1 publication Critical patent/EP0235340B1/fr
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
    • 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
    • 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
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B22D41/01—Heating means

Definitions

  • the present invention relates to a plasma heating device for heating a molten steel in a tundish, more parti­cularly an anode system for the plasma heating device suitable for use in a tundish of a continuous casting apparatus.
  • the main object of the present invention is to provide such anode systems which are economical and simple in structure and can be used for a long period of time under severe service conditions.
  • the plasma heating device comprises a power source, a plasma torch (cathode) for generating a plasma arc, which makes an electrical path between the molten metal and the plasma torch and an electrode (anode) to supply current into the molten metal.
  • the current supplying electrode is formed by placing electric conductive carbon bricks on the bottom surface of a stationary furnace, such as a melting furnace, and connecting a lead wire to the brick formation to provide a current path, or by forming part of the bottom portion of the furnace with a metal having a similar composition as the metal to be melted in the furnace instead of the bricks, and projecting part of the metal formation outside the furnace in the form of fins for necessary cooling.
  • a stationary furnace such as a melting furnace
  • the current supplying electrode is considerably melted by the molten metal, the molten metal pool remaining after the pouring of the molten metal from the furnace is allowed to solidify again prior to a subsequent charge of the furnace and this solidified metal can be used as part of the electrode.
  • the electrode provided on the furnace bottom is very often damaged, and once damaged, must be replaced with a new one. Therefore, the service life of the current supplying electrodes according to the conventional systems are very short when used in the tundish.
  • the tundish itself is more often replaced and the brick works are more frequently replaced as compared with the stationary furnaces, and each replacement of the tundish or the brick works requires renewal of the electrode, thus increasing the running cost of the tundish operation and complicating the over-all works including the tundish replacement and the brick works replacement.
  • the present invention provides an improved structure of an anode system for plasma heating usable in the tundish of a continuous casting apparatus, which is economical and simple in structure and can enjoy a long service life.
  • the anode system comprises a dam member provided on the bottom surface of a tundish near and along a side wall or an over-flow wall of the tundish to form a space or gap therebetween, an electrical conductive member with its end portion exposed to the space or gap and the other end electrically connected to a power source, said dam member having a height higher than a level of molten metal remaining after the pouring of the molten metal from the tundish, but lower than a minimum level of molten metal normally contained in the tundish.
  • the anode in the form of wire or strip is inserted through a hole provided in the side wall or bottom wall of the tundish into the space formed between the side wall and the dam member or between the over-flow wall provided on the bottom of the tundish and the dam member.
  • the electrical conductive member is placed on the inside of the side wall along its height and part of the bottom adjacent to the side wall, with the end portion projecting into the space or gap between the side wall or the over-flow wall and the dam member and the portion exposed to the molten metal in the tundish being covered by refractories for protection from the molten metal.
  • the side wall used in the present invention includes the short side wall and the long side wall.
  • the pouring of the molten metal into a mold is continuously performed, while the supply of the molten metal into the tundish is made from a ladle, and when one ladle is poured out this vacant ladle must be changed by another ladle to continue the supply of the molten metal to the tundish.
  • the supply of the molten metal is stopped temporarily, so that the level of molten metal in the ladle lowers.
  • This level is called the minimum level of the molten metal normally contained in the tundish, and is determined in view of the design of a tundish, a final product quality to be sought, etc. Usually this minimum level is about 400 to 450 mm from the bottom surface.
  • the level of molten metal remaining after pouring out of the molten metal from the tundish comes about 150 to 200 mm from the bottom surface of the tundish.
  • 1 is a tundish
  • 2 is a cover for the tundish
  • 3 is a molten metal contained in the tundish
  • 3a represents the maximum level of the molten metal normally contained in the tundish
  • 3b represents the minimum level of the molten metal normally contained in the tundish at the time of ladle change
  • 3c represents the level of the molten metal remaining in the tundish after the pouring-out of the molten metal from the tundish.
  • 4 is a cover for a heating chamber provided at the top of the tundish, through which the plasma torch 5 electrically connected to the power source through a cable is inserted into the heating chamber.
  • 6 is the refractory dam member according to the present invention.
  • 7 is an electrical conductive member (anode) with its front end projecting into the space or gap, and the other end being electrically connected to the power source through a cable 9.
  • the current passage to the molten metal 3 in the tundish is effected through the electrical conductive member 7, and the molten metal flowing into the space or gap or the solidified metal 8 in the space or gap.
  • the dam member 6 has a height lower than the minimum level 3b (about 400 to 450 mm - preferably 350 to 400 mm - from the bottom surface) of the molten metal normally contained in the tundish at the time of the ladle change but higher than the level 3c (about 150 to 250 mm preferably 150 to 200 mm from the bottom surface) of the molten metal remaining in the tundish after the pouring out of the molten metal from the tundish.
  • the dam member bridges between the opposing longitudinal side walls of the tundish preferably in a constant height.
  • the dam member may be ] shape or arch shape extending from the side wall and surrounding the electrical member.
  • the dam member As the dam member is lower than the minimum level 3b of the molten metal, the current passage to the molten metal can be smoothly effected even at the time of ladle change when the level of the molten metal lowers to the minimum level 3b.
  • the solidified metal in the space can never be pysically connected to the solidified metal remaining in the tundish because of the existence of the dam member there­between, so that the solidified metal 8 in the space is not removed even when the solidified metal remaining on the bottom of the tundish is removed and can be retained in the space serving as a component of the anode permanently without the damage of the dam member, and the side wall refractory around the hole through which the anode is inserted.
  • the electrical conductive material is inserted through the short side wall of the tundish, but it may be inserted through the longitudinal side wall or bottom wall of the tundish, and the space between the dam member and the side wall may be provided between an over-flow wall (2c in Figures 3 (a), (b), in cases where such an over-flow wall is provided in the tundish, and the dam member provided near the over-flow wall.
  • the space formed between the over-flow wall and the dam member functions similarly as the space formed between the side wall and the dam member.
  • FIGs 2(a) and 2(b) showing another modification of the present invention 6 is a dam member of the same structure and design as the dam member shown in Figure 1, 8 is a refractory cover for the conductive member 7 which is formed in a hooked shape or L shape, made of steel.
  • the conductive member 7 is inserted into the tundish from upward and runs along the height of the side wall and part of the bottom of the tundish into the space formed between the dam member and the refractory cover 8, with the rising end portion 7c projecting into the space, preferably up to the height of the dam member.
  • the refractory cover 8 covers the portion 7a running on the side wall and the portion 7b running on the bottom so as to protect the conductive member from the attack of the molten metal in the tundish.
  • the rising portion projecting into the space, when brought into contact with the molten metal is melted by the molten metal during the tundish operation.
  • the embodiment shown in Figures 2(a) and 2(b) has the advantages that as the rising end portion 7c initially projects into the space up to the height of the dam member, it is no more necessary for the conductive member to wait for the flowing-in of the molten metal into the narrow space between the side wall and the dam member as in the embodiment shown in Figure 1, and as the conductive member is not inserted through the side wall there is no danger of leeking of the molten metal through the hole of the side wall.
  • the over-flow wall is used for removing an excessive amount of the molten metal from the tundish.
  • This modified mebodiment produces same results as the embodiment shown in Figures 2(a) and 2(b).
  • the anode assembly is formed by utilizing the longitudinal side wall 2d of the tundish.
  • the dam member 6 extends from the side wall in a ] shape surrounding the electrical conductive member 7.
  • the anode system according to the present invention can be used almost permanently for the plasma heating in the tundish and is very economical and simple in the structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP86103047A 1986-03-07 1986-03-07 Système d'anode pour réchauffage du plasma utilisé dans un panier intermédiaire Expired EP0235340B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8686103047T DE3666161D1 (en) 1986-03-07 1986-03-07 An anode system for plasma heating usable in a tundish
EP86103047A EP0235340B1 (fr) 1986-03-07 1986-03-07 Système d'anode pour réchauffage du plasma utilisé dans un panier intermédiaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86103047A EP0235340B1 (fr) 1986-03-07 1986-03-07 Système d'anode pour réchauffage du plasma utilisé dans un panier intermédiaire

Publications (2)

Publication Number Publication Date
EP0235340A1 true EP0235340A1 (fr) 1987-09-09
EP0235340B1 EP0235340B1 (fr) 1989-10-11

Family

ID=8194951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103047A Expired EP0235340B1 (fr) 1986-03-07 1986-03-07 Système d'anode pour réchauffage du plasma utilisé dans un panier intermédiaire

Country Status (2)

Country Link
EP (1) EP0235340B1 (fr)
DE (1) DE3666161D1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0320820A1 (fr) * 1987-12-12 1989-06-21 Nippon Steel Corporation Procédé de fabrication d'acier inoxydable à structure austénitique ayant une excellente résistance à l'eau de mer
GB2239828A (en) * 1990-01-15 1991-07-17 Davy Mckee Tundish
EP0511825A1 (fr) * 1991-05-01 1992-11-04 The BOC Group plc Procédé et appareil de chauffage
FR2690365A1 (fr) * 1992-04-27 1993-10-29 Induga Ind Giesserei Dispositif de chauffage pour une installation de coulée continue de métal.
WO1995029022A1 (fr) * 1994-04-26 1995-11-02 Mannesmann Ag Procede et dispositif pour le chauffage d'une masse metallique en fusion
CN102896285A (zh) * 2011-07-29 2013-01-30 宝山钢铁股份有限公司 一种薄带连铸铸造方法及装置
WO2016096596A1 (fr) 2014-12-18 2016-06-23 Voestalpine Stahl Gmbh Répartiteur pour installations de coulée continue
CN110871268A (zh) * 2018-09-04 2020-03-10 上海梅山钢铁股份有限公司 一种连铸中间包等离子加热的等电位控制装置及方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 203 (M-241)[1348], 8th September 1983; & JP-A-58 100 951 (SHIN NIPPON SEITETSU K.K.) 15-06-1983 *
PATENTS ABSTRACTS OF JAPAN, vol. 9, no. 14 (M-352)[1737], 22nd January 1985; & JP-A-59 163 062 (SHIN NIPPON SEITETSU K.K.) 14-09-1984 *
PATENTS ABSTRACTS OF JAPAN, vol. 9, no. 317 (C-319)[2040], 12th December 1985; & JP-A-60 152 610 (SHIN NIPPON SEITETSU K.K.) 10-08-1985 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4883544A (en) * 1987-12-12 1989-11-28 Nippon Steel Corporation Process for preparation of austenitic stainless steel having excellent seawater resistance
EP0320820A1 (fr) * 1987-12-12 1989-06-21 Nippon Steel Corporation Procédé de fabrication d'acier inoxydable à structure austénitique ayant une excellente résistance à l'eau de mer
GB2239828A (en) * 1990-01-15 1991-07-17 Davy Mckee Tundish
EP0511825A1 (fr) * 1991-05-01 1992-11-04 The BOC Group plc Procédé et appareil de chauffage
GB2267051B (en) * 1992-04-27 1995-11-08 Induga Ind Und Gieberei Anlage A heating device for a continuous metal casting plant
FR2690365A1 (fr) * 1992-04-27 1993-10-29 Induga Ind Giesserei Dispositif de chauffage pour une installation de coulée continue de métal.
GB2267051A (en) * 1992-04-27 1993-11-24 Induga Ind Und Gieberei Anlage Heating device for continuous casting plant
WO1995029022A1 (fr) * 1994-04-26 1995-11-02 Mannesmann Ag Procede et dispositif pour le chauffage d'une masse metallique en fusion
CN102896285A (zh) * 2011-07-29 2013-01-30 宝山钢铁股份有限公司 一种薄带连铸铸造方法及装置
WO2016096596A1 (fr) 2014-12-18 2016-06-23 Voestalpine Stahl Gmbh Répartiteur pour installations de coulée continue
DE102014119109A1 (de) * 2014-12-18 2016-06-23 Voestalpine Stahl Gmbh Verteiler für Stranggießanlagen
DE102014119109B4 (de) 2014-12-18 2018-12-13 Voestalpine Stahl Gmbh Verteiler für Stranggießanlagen
US10632527B2 (en) 2014-12-18 2020-04-28 voestalpine Stalh GmbH Tundish for a continuous casting plant
CN110871268A (zh) * 2018-09-04 2020-03-10 上海梅山钢铁股份有限公司 一种连铸中间包等离子加热的等电位控制装置及方法

Also Published As

Publication number Publication date
EP0235340B1 (fr) 1989-10-11
DE3666161D1 (en) 1989-11-16

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