EP0094926A1 - Orifice for injecting a protecting gas into a casting tube - Google Patents

Orifice for injecting a protecting gas into a casting tube Download PDF

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Publication number
EP0094926A1
EP0094926A1 EP19830870047 EP83870047A EP0094926A1 EP 0094926 A1 EP0094926 A1 EP 0094926A1 EP 19830870047 EP19830870047 EP 19830870047 EP 83870047 A EP83870047 A EP 83870047A EP 0094926 A1 EP0094926 A1 EP 0094926A1
Authority
EP
European Patent Office
Prior art keywords
pouring tube
tube
annular channel
injecting
pouring
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
EP19830870047
Other languages
German (de)
French (fr)
Other versions
EP0094926B1 (en
Inventor
Tom P. Hamilton
Roberto Grosso
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.)
Vesuvius International Corp
Original Assignee
Vesuvius International 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
Priority to BE208080 priority Critical
Priority to BE0/208080A priority patent/BE893168A/en
Application filed by Vesuvius International Corp filed Critical Vesuvius International Corp
Publication of EP0094926A1 publication Critical patent/EP0094926A1/en
Application granted granted Critical
Publication of EP0094926B1 publication Critical patent/EP0094926B1/en
Expired legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/072Treatment with gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50Pouring-nozzles
    • B22D41/58Pouring-nozzles with gas injecting means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00Charging; Discharging; Manipulation of charge
    • F27D3/14Charging or discharging liquid or molten material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00Charging; Discharging; Manipulation of charge
    • F27D3/16Introducing a fluid jet or current into the charge

Abstract

A pouring tube (8) of refractory material, has at its upper part a series of orifices for injecting a protective gas, for example argon, in order to create a protective atmosphere against oxidation of the metal and cool the walls of the pouring tube. The injection orifices according to the invention are grooves (11) formed in the upper frustoconical shape of the pouring tube (8) on which is fixed an assembly collar (10). These grooves are connected together by an annular channel (12).

Description

  • The present invention relates to a pouring tube made of refractory material having at its upper part orifices for injecting a protective gas in order to prevent oxidation of the molten metal and to cool the walls of said pouring tube. It relates to a pouring tube provided with protective gas injection orifices having a particular arrangement and shape.
  • The present invention finds wide application in the continuous casting of steel, during which the latter is discharged from a ladle to a degassing enclosure or to a basket, and from the latter to a mold or to an ingot mold.
  • The duration of the casting operation and the large contact surface that the metal presents to the air make the implementation of means inevitable creating a protective atmosphere protecting all the free surfaces of the metal from oxidation.
  • British patent 2,013,856 discloses a method and an apparatus for controlling and regulating, in particular in continuous casting, the discharge rate of a container provided with a sliding closure device and a pouring tube. .
  • The upper part of the pouring tube is embedded in a recess provided in the lower face of a fixed lower plate of said sliding closure device.
  • The recess is lined with a metal ring and is connected to an annular channel through which an inert or reducing gas is injected. This metal ring is intended to form a baffle in order to prevent the infiltration of steel into the annular channel while allowing the passage of gas.
  • This technique of injecting gas into the pouring tube however has the serious drawback of not preventing the obstruction of part or even of the whole of the injection orifice by solidified metal.
  • On the other hand, a device for replacing the pouring tube mounted on the discharge orifice of a ladle is known from American patent 4,079,869. The gas stream, which is generally argon, is used primarily to cool the pouring tube. The gas is brought in by simple ramps distributing it as quickly as possible over the surfaces to be protected. As in the device described above, the gas pipes are provided in the movable arms of the support frame. The injection ports are formed in the annular flange on which the tube and the fixing fork rests.
  • These round holes are flush with the inside wall of the tube without any special protection. Experience has shown that it is not possible to distribute the inert gases uniformly over the inner surface of the pouring tube and to lower the oxygen content to a level everywhere low enough to make oxidation of the metal negligible.
  • The reduced dimensions of these orifices favor their rapid obstruction during each interruption of the casting. The protection of the metal by a gas is therefore difficult to achieve and, if it is done, it is likely to be only an illusion.
  • The object of the present invention is to avoid the drawbacks mentioned above. It relates to a refractory material pouring tube having at its upper part injection orifices for a protective gas during the casting operation in the flow of molten metal in order to prevent oxidation of that -this and to cool the walls of the pouring tube, this tube being essentially characterized in that it has a frustoconical part on which is fixed an assembly collar intended to apply it against a bottom plate of an orifice discharge from a ladle and in which are formed along certain generators of the truncated cone, injection grooves connected to each other at their upper part by an annular channel connected via a support ring to a source of shielding gas.
  • According to a feature of the invention, the aforementioned injection grooves are regularly distributed along the aforesaid frustoconical part.
  • According to another feature of the invention, the source of shielding gas is a source of inert gas, in particular argon.
  • Other details and particularities of the invention will appear during the following detailed description of two particular embodiments given purely by way of illustration of a pouring tube provided with a device for injecting a protective gas. This detailed description refers to the accompanying drawings, in which:
    • - Figure 1 is a longitudinal section of a pouring tube according to the invention, the fixing collar is fixed to the upper edge of the tube;
    • - Figure 2 is a plan view of the pouring tube shown in Figure 1;
    • - Figures 3 and 4 are similar to Figures 1 and 2, illustrating a pouring tube whose annular channel is embedded in the fixing collar.
  • As shown in Figure 1, the gas injection device according to the invention is mounted on the bottom of a ladle, designated as a whole by the reference notation 1 and intended to treat a bath of molten metal. A bottom plate 2 surrounds a discharge orifice 3 of the ladle 1 provided with a closure device 4.
  • The closure device 4 consists of a movable anchor plate 5 made of refractory material, possibly consisting of several elements 6 each having an orifice 7 on which is fixed a pouring tube 8 having a cylindrical flow channel 9 of determined diameter.
  • The upper part of the pouring tube 8 is flared. It carries a fixing collar 10 intended to apply the pouring tube 8 against the bottom plate 2 provided with the orifice 3 for discharging a ladle. The flared part in fact determines a truncated cone, located in the extension of the channel of the pouring tube 8.
  • Along some generators of this truncated cone, grooves 11 are provided for injection. These grooves 11 are connected to each other at their upper part by an annular channel 12, possibly embedded in the mass of the fixing collar 10 of the tube 8. A radial duct 13 connects the annular channel 12 to the support ring 14 at the source protective gas 15, possibly by means of oscillating arms 16.
  • In the operating position, the flared part of the pouring tube 8 is arranged below a constriction 17 of the discharge orifice 3 of the ladle 1.
  • The fixing collar 10 of the pouring tube 8 shown in FIG. 1, surrounds the upper edge of the flared part of said pouring tube 8. The circular channel is formed by the annular wall of the fixing collar 10 and the base of a cylindrical or frustoconical part 18 which fits into the pouring tube forming a constriction 17 in the pouring channel.
  • This constriction 17, which, during the casting operation, acts like a Venturi tube, creates a depression.
  • This depression has the effect of sucking in the pouring tube 8, during the casting operation through the injection grooves provided in the pouring tube 8, a gas or mixture of protective gases and distributing it. along the walls of the pouring tube 8 in order to protect the free surfaces of the metal from oxidation.
  • Indeed, the presence of air in the pouring tube causes a reduction in the quality of the casting metal due to the formation of exogenous blowing caused by the air driven mechanically during the casting. In addition, the oxidized metal tends to stick in the pouring tube 8 and to give a film of oxides which, in the case of an ingot mold, can be the cause of skin defects.
  • The present invention allows above all to keep the injection grooves free even in case of interruption of the casting operation.
  • By keeping all of the injection ports free and clear, it allows a homogeneous distribution of the shielding gas. It is thus possible to lower everywhere around the metal the oxygen content to a sufficiently low level so that the oxidation becomes negligible.
  • The injection of a protective gas also makes it possible to cool the internal wall of the pouring tube 8 made of refractory material. This tube 8 is subjected to a considerable thermal and chemical attack. Among other things, it is subject to significant erosion. The injection of shielding gas makes it possible to reduce or partially avoid this erosion. The pouring tube 8 must therefore be replaced less often. This is moreover, with a view to frequent replacement of this pouring tube, a support fork is provided to keep it in place.
  • In a second embodiment, illustrated in FIG. 3, the fixing collar surrounds the entire frustoconical part of the pouring tube so as to form a more solid assembly.
  • This second embodiment gives sufficient solidity even if the annular channel 12 is embedded in the mass of the fixing collar 10.
  • Nitrogen is not suitable as a shielding gas because it causes the formation of nitrides. Generally, argon is used.
  • It is obvious that the invention is not limited to the embodiments described and that many modifications can be made to the form, the arrangement, the composition of certain elements intervening in them without however being removed. of the scope of the invention.

Claims (5)

1. pouring tube of refractory material having at its upper part orifices for injecting a shielding gas during the casting operation in the flow of molten metal in order to avoid oxidation thereof and to cool the walls of the pouring tube, characterized in that it has a frustoconical part on which is fixed an assembly collar (10) intended to apply it against a bottom plate (2) of a discharge orifice (3) a ladle (1) and in which are formed, along certain generators of the truncated cone, injection grooves (11), connected to each other at their upper part by an annular channel (12 ) connected via a support ring to a source (15) of shielding gas.
2. pouring tube according to claim 1, characterized in that the injection grooves (11) are regularly distributed along the aforesaid frustoconical part.
3. pouring tube according to any one of the preceding claims, characterized in that the annular channel (12) which connects the aforementioned injection grooves (11) is formed by the inner wall of the collar for fixing the pouring tube and the outer wall of an element (18) which fits into said pouring tube (8).
4. pouring tube according to any one of claims 1 and 2, characterized in that the annular channel (12) is embedded in the mass of the fixing collar (10) of the pouring tube.
5. pouring tube according to claim 1, characterized in that the above-mentioned source of inert gas (15) is a source of argon.
EP19830870047 1982-05-13 1983-05-11 Orifice for injecting a protecting gas into a casting tube Expired EP0094926B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE208080 1982-05-13
BE0/208080A BE893168A (en) 1982-05-13 1982-05-13 Protection gas injection hose in a cast tube

Publications (2)

Publication Number Publication Date
EP0094926A1 true EP0094926A1 (en) 1983-11-23
EP0094926B1 EP0094926B1 (en) 1986-02-26

Family

ID=3843530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830870047 Expired EP0094926B1 (en) 1982-05-13 1983-05-11 Orifice for injecting a protecting gas into a casting tube

Country Status (5)

Country Link
US (1) US4519438A (en)
EP (1) EP0094926B1 (en)
JP (1) JPH0142787B2 (en)
BE (1) BE893168A (en)
DE (1) DE3362258D1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3342071A1 (en) * 1983-11-22 1985-06-05 Didier Werke Ag Device for shielding a metal casting ray
GB2179573A (en) * 1985-08-29 1987-03-11 British Steel Corp Metal-pouring equipment modified for protective gas injection
DE3624320A1 (en) * 1986-07-18 1988-01-28 Dahlhoff Friedrich Wilhelm Sealing of casting equipment by means of protective gas supply
EP0373555A2 (en) * 1988-12-14 1990-06-20 NUOVA SIRMA S.p.A. Improvement in processes and devices for the continuous casting of metals
EP0582496A1 (en) * 1992-07-29 1994-02-09 Sollac Internal pouring tube made from refractory material for metallurgical vessels
WO1995026439A1 (en) * 1994-03-25 1995-10-05 Asea Brown Boveri Inc. Smelt spout for a recovery furnace
KR100728512B1 (en) * 2000-03-01 2007-06-15 데구사 게엠베하 Process for the production of organosilylalkyl polysulfanes

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0240482B1 (en) * 1986-04-02 1990-09-19 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Assoc. sans but lucratif Ver, zonder winstoogmerk Installation for casting steel
DE3634893C1 (en) * 1986-10-14 1988-03-31 Didier Werke Ag Casting-pipe arrangement, particularly for launders in continuous casting installations
US4836508A (en) * 1988-05-03 1989-06-06 Vesuvius Crucible Company Ladle shroud with co-pressed gas permeable ring
US5067552A (en) * 1989-07-26 1991-11-26 Ltv Steel Company, Inc. Shrouding for top pouring of ingots
US5404929A (en) * 1993-05-18 1995-04-11 Liquid Air Corporation Casting of high oxygen-affinity metals and their alloys
US20080184848A1 (en) * 2006-08-23 2008-08-07 La Sorda Terence D Vapor-Reinforced Expanding Volume of Gas to Minimize the Contamination of Products Treated in a Melting Furnace
US20090064821A1 (en) * 2006-08-23 2009-03-12 Air Liquide Industrial U.S. Lp Vapor-Reinforced Expanding Volume of Gas to Minimize the Contamination of Products Treated in a Melting Furnace
US8403187B2 (en) * 2006-09-27 2013-03-26 Air Liquide Industrial U.S. Lp Production of an inert blanket in a furnace
JP5505969B2 (en) * 2010-03-15 2014-05-28 黒崎播磨株式会社 Long nozzle
JP5459851B2 (en) * 2010-03-31 2014-04-02 黒崎播磨株式会社 Long nozzle
CN103350222A (en) * 2013-07-12 2013-10-16 抚顺特殊钢股份有限公司 Novel argon gas protecting device for die casting
CN106141159A (en) * 2015-04-13 2016-11-23 天工爱和特钢有限公司 A kind of argon protecting cover of high speed steel mould pouring in steel smelting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE662975A (en) * 1964-04-29 1965-10-25
US3558256A (en) * 1964-10-21 1971-01-26 Paderwerk Gebruder Benteler Apparatus for the continuous casting of metals
FR2220451A1 (en) * 1973-03-05 1974-10-04 Jones & Laughlin Steel Corp
GB2013856A (en) * 1978-01-25 1979-08-15 Uss Eng & Consult Pouring of molten metal into a continuous caster mould

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5213293Y2 (en) * 1971-10-12 1977-03-25
DE2557726C3 (en) * 1975-12-20 1980-09-11 Stopinc Ag, Zug (Schweiz)

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE662975A (en) * 1964-04-29 1965-10-25
US3558256A (en) * 1964-10-21 1971-01-26 Paderwerk Gebruder Benteler Apparatus for the continuous casting of metals
FR2220451A1 (en) * 1973-03-05 1974-10-04 Jones & Laughlin Steel Corp
GB2013856A (en) * 1978-01-25 1979-08-15 Uss Eng & Consult Pouring of molten metal into a continuous caster mould

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3342071A1 (en) * 1983-11-22 1985-06-05 Didier Werke Ag Device for shielding a metal casting ray
GB2150059A (en) * 1983-11-22 1985-06-26 Didier Werke Ag Shielding a stream of molten metal from the atmosphere
GB2179573A (en) * 1985-08-29 1987-03-11 British Steel Corp Metal-pouring equipment modified for protective gas injection
DE3624320A1 (en) * 1986-07-18 1988-01-28 Dahlhoff Friedrich Wilhelm Sealing of casting equipment by means of protective gas supply
EP0373555A2 (en) * 1988-12-14 1990-06-20 NUOVA SIRMA S.p.A. Improvement in processes and devices for the continuous casting of metals
EP0373555A3 (en) * 1988-12-14 1991-11-21 NUOVA SIRMA S.p.A. Improvement in processes and devices for the continuous casting of metals
EP0582496A1 (en) * 1992-07-29 1994-02-09 Sollac Internal pouring tube made from refractory material for metallurgical vessels
WO1995026439A1 (en) * 1994-03-25 1995-10-05 Asea Brown Boveri Inc. Smelt spout for a recovery furnace
KR100728512B1 (en) * 2000-03-01 2007-06-15 데구사 게엠베하 Process for the production of organosilylalkyl polysulfanes

Also Published As

Publication number Publication date
BE893168A1 (en)
BE893168A (en) 1982-11-16
JPH0142787B2 (en) 1989-09-14
US4519438A (en) 1985-05-28
DE3362258D1 (en) 1986-04-03
JPS58209453A (en) 1983-12-06
EP0094926B1 (en) 1986-02-26

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