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AU2005263118B2 - Stopper rod for delivering gas into a molten metal - Google Patents
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AU2005263118B2 - Stopper rod for delivering gas into a molten metal - Google Patents

Stopper rod for delivering gas into a molten metal Download PDF

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Publication number
AU2005263118B2
AU2005263118B2 AU2005263118A AU2005263118A AU2005263118B2 AU 2005263118 B2 AU2005263118 B2 AU 2005263118B2 AU 2005263118 A AU2005263118 A AU 2005263118A AU 2005263118 A AU2005263118 A AU 2005263118A AU 2005263118 B2 AU2005263118 B2 AU 2005263118B2
Authority
AU
Australia
Prior art keywords
layer
stopper
stopper rod
rod according
gas
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.)
Ceased
Application number
AU2005263118A
Other versions
AU2005263118A1 (en
Inventor
Philippe Guillo
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 Crucible Co
Original Assignee
Vesuvius Crucible Co
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 Vesuvius Crucible Co filed Critical Vesuvius Crucible Co
Publication of AU2005263118A1 publication Critical patent/AU2005263118A1/en
Application granted granted Critical
Publication of AU2005263118B2 publication Critical patent/AU2005263118B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B22D41/14Closures
    • B22D41/16Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18Stopper-rods therefor
    • 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
    • B22D41/14Closures
    • B22D41/16Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18Stopper-rods therefor
    • B22D41/186Stopper-rods therefor with means for injecting a fluid into the melt
    • 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
    • B22D41/14Closures
    • B22D41/16Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Description

WO 2006/007672 PCT/BE2005/000116 Stopper rod for delivering gas into a molten metal.
Description.
[0001] This invention relates to a mono-block stopper rod used to control the flow of molten metal from a discharge nozzle in a holding vessel during metal teeming.
[0002] In continuous casting processes, the use of gases injected down the stopper has been shown to have significant benefits on the quality of metal being cast. For example, inert gases such as argon or nitrogen can be injected to reduce the problems due to alumina build-up and clogging or to assist in removing solidification products from the vicinity of the discharge nozzle.
Reactive gases may also be employed when the melt composition needs modifying.
Conventionally, the stopper generally made from an alumina carbon refractory composition is provided with an internal chamber connected to gas supply means on the one end and to a gas discharge port at the other end.
[0003] Various systems have been developed to ensure an accurately measured flow of gas is supplied to the stopper. Problems have been encountered with sealing such systems and ensuring that the gas follows its intended path and is not wasted. Stoppers which have proved to be successful in meeting many of these requirements are disclosed in EP-A2-358,535, WO-A1-00/30785 and WO-A1-00/30786 and more recently in WO-A1-02/100579.
[0004] Pursuing its development work in this field, the applicant has now realized that the gas injected into the molten metal through the stopper could be contaminated when passing through the stopper.
[0005] In particular, it is suspected that the carbon present in the composition constituting the stopper body could reduce some of the metal oxides also present in the composition; this reduction is accompanied by the generation of carbon monoxide. The carbon monoxide injected into the molten metal will in turn oxidize the aluminum which has been added to calm the steel producing thereby important quantities of alumina contributing thus to the alumina build-up and clogging.
[0006] It would therefore be advantageous to provide a stopper rod which would not contaminate the gas passing therethrough.
[00071 According to the invention, this problem is solved for a stopper rod adapted to deliver gas during pouring of molten metal comprising a stopper body having an internal chamber and a gas discharge port, a bore connecting the internal chamber to the gas discharge port, the internal chamber and the bore defining a gas passageway. According to the invention, the walls of the gas passageway are provided with a layer of a material which will not produce carbon monoxide at the temperature of use.
[0008] It must be noted that it is, to the applicant's knowledge, the first time that it is proposed to provide a refractory article with such a layer on a portion of said article that will never contact the molten metal. On the contrary, in the prior art as exemplified for example by the document US-A1 -5,691,061 or US-Al -5,681,499, such a layer is only provided on portions that are always CONFIRMATION COPY WO 2006/007672 PCT/BE2005/000116 2 in contact with the metal.
[0009] The layer can be formed as a coating applied on the walls of the gas passageway after the manufacture of the stopper rod. Such a coating can be applied by spraying a liquid, wet or semi-wet composition or simply by filling the inner chamber with the appropriate composition.
Once the coating is dried, the stopper rod can then be cured. Alternatively, the curing of the stopper can take place before the coating step. Advantageously, the layer is a liner pressed simultaneously with the stopper rod body. In this case, it is indeed possible to reduce the number of manufacturing steps. According to another variant, the layer extends through essentially the who!e thickness of the walls of the gas passageway.
[0010] The material constituting the a layer which will not produce carbon monoxide at the temperature of use can be selected from three different categories of materials: a) materials which do not contain carbon; b) materials essentially constituted of non reducible refractory oxides; or c) materials comprising elements which will react with the generated carbon monoxide.
Preferably, the selected material will present two or three of the above properties.
[0011] Examples of suitable material of the first category are silica (for example vitreous silica), alumina, mullite or magnesia based material (spinel). In certain cases, these materials can however be somehow difficult to apply as a liner or coating (the lack of carbon in the layer can cause some thermal shock problems) and do not constitute the preferred embodiment of the invention.
[0012] Suitable materials of the second category are for example pure alumina carbon compositions. In particular, these compositions should contain very low amount of silica or of conventional impurities which are usually found in silica (sodium or potassium oxide). In particular, the silica and its conventional impurities should be kept under 2 wt. preferably under 1 wt. [0013] Suitable materials of the third category comprises for example free metal able to combine with carbon monoxide to form a metal oxide and free carbon. Silicon and aluminum are suitable for this application. These materials can also or alternatively comprise carbides or nitrides able to react with carbon monoxide (for example silicon or boron carbides).
[0014] Preferably the selected material will belong to the second or third categories, even preferably, it will belong to the second and third category.
[0015] A suitable material constituting the layer which will not produce carbon monoxide at the temperature of use can comprise 60 to 88 wt. of alumina, 10to 20 wt. graphite and 2 to wt. of silicon carbide. Such a material is essentially constituted of non-oxides species or nonreducible oxides and comprises silicon carbide which can react with the carbon monoxide if some is generated in working condition.
[0016] The invention will now be described with reference to the attached drawing in which Fig.
1 shows a cross-section of a stopper rod according to the invention. Reference 1 depicts respectively the internal chamber and a gas discharge port of the stopper rod. A bore 3 WO 2006/007672 PCT/BE2005/000116 3 connects the internal chamber 1 to the gas discharge port 2. The bore 3 and the internal chamber 1 define a passageway for the gas. Fig. 1 represents an embodiment wherein the layer 4 has been copressed as a liner with the stopper body. Very conveniently, the liner 4 can be constituted of several pre-formed tubular portions (41, 42, 43) which are all copressed with the stopper body. A portion of the metal rod 5 connecting the stopper rod to the rigging device (not shown) is depicted in working position. Preferably, the metal rod 5 extends beyond the highest point of the layer 4. Even more preferably, a sealing gasket 6 is inserted around the lower end of the metal rod

Claims (9)

1. Stopper rod adapted to deliver gas during pouring of molten metal comprising a stopper body having an internal chamber and a gas discharge port a bore connecting the internal chamber to the gas discharge port the internal chamber and the bore defining a gas passageway, characterized in that the walls of the gas passageway are provided with a layer which will not produce carbon monoxide at the temperature of use.
Stopper rod according to claim 1, characterized In that the layer is a liner copressed with the body.
3. Stopper rod according to claim 1, characterized in that the layer is a coating applied on the walls of the gas passageway.
4. Stopper rod according to claim 1, characterized in that the layer extends through essentially the whole thickness of the walls of the gas passageway.
5. Stopper rod according to any one of claims 1 to 4, characterized in that the layer (4) extends upwardly beyond the lowest point reached by a metal rod used to attach the stopper to a rigging device.
6. Stopper rod according to any one of claims 1 to 5, characterized in that the material constituting the layer is a selected from the groups of a) materials which do not contain carbon; b) materials essentially constituted of non reducible refractory oxides; and/or c) materials comprising elements which will react with the generated carbon monoxide, or mixtures thereof.
7. Stopper rod according to any one of the preceding claims, characterized in that the layer comprises 60 to 88 wt. of alumina, 10 to 20 wt. graphite and 2 to 10 wt. of silicon carbide.
8. Assembly of a stopper rod according to any one of the preceding claims with a metal rod used to attach the stopper to a rigging device wherein the metal rod of extends beyond the highest point of the layer
9. Assembly according to claim 8, wherein a sealing gasket is inserted around the lower end of the metal rod
AU2005263118A 2004-07-20 2005-07-15 Stopper rod for delivering gas into a molten metal Ceased AU2005263118B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04447179 2004-07-20
EP04447179.5 2004-07-20
PCT/BE2005/000116 WO2006007672A2 (en) 2004-07-20 2005-07-15 Stopper rod for delivering gas into a molten metal

Publications (2)

Publication Number Publication Date
AU2005263118A1 AU2005263118A1 (en) 2006-01-26
AU2005263118B2 true AU2005263118B2 (en) 2009-02-19

Family

ID=34933070

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2005263118A Ceased AU2005263118B2 (en) 2004-07-20 2005-07-15 Stopper rod for delivering gas into a molten metal

Country Status (20)

Country Link
US (1) US20070210494A1 (en)
EP (1) EP1789220B1 (en)
JP (1) JP4933430B2 (en)
KR (1) KR101128610B1 (en)
CN (1) CN1988972A (en)
AR (1) AR050257A1 (en)
AT (1) ATE381402T1 (en)
AU (1) AU2005263118B2 (en)
BR (1) BRPI0513258B1 (en)
CA (1) CA2572497C (en)
DE (1) DE602005003968T2 (en)
ES (1) ES2299056T3 (en)
MX (1) MX2007000764A (en)
MY (1) MY141417A (en)
PL (1) PL1789220T3 (en)
RU (1) RU2375150C2 (en)
TW (1) TWI357837B (en)
UA (1) UA89642C2 (en)
WO (1) WO2006007672A2 (en)
ZA (1) ZA200700750B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007004958B4 (en) * 2007-01-26 2010-04-29 Innotec Ltd. Plugs for use in metallurgical installations
ATE485909T1 (en) * 2008-11-19 2010-11-15 Refractory Intellectual Prop PLUG ROD
PL2209056T3 (en) * 2009-01-16 2012-05-31 Refractory Intellectual Property Gmbh & Co Kg Flow control device in a continuous casting steel-making process
CN101513670B (en) * 2009-03-18 2010-12-01 山东中齐耐火材料集团有限公司 Integral stopper screw rod connecting device and a manufacturing method thereof
ES2428314T3 (en) * 2011-09-23 2013-11-07 Refractory Intellectual Property Gmbh & Co. Kg Ceramic refractory casting plug
EP2653248B1 (en) 2012-04-16 2014-04-02 Refractory Intellectual Property GmbH & Co. KG Ceramic refractory stopper
CN104368804B (en) * 2014-09-25 2016-08-24 武汉重工铸锻有限责任公司 Chock plug and the integral processing method of nozzle connection
PL3705204T3 (en) * 2019-03-08 2022-10-17 Refractory Intellectual Property Gmbh & Co. Kg A stopper rod and a method for providing a uniform gas curtain around a stopper rod
JP7022095B2 (en) * 2019-03-28 2022-02-17 日本製鋼所M&E株式会社 Stopper
JP2022552257A (en) 2019-10-10 2022-12-15 リフラクトリー インテレクチュアル プロパティ ゲーエムベーハー ウント コ カーゲー Isostatic press product and method of manufacture for use in processing molten metal

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US3200457A (en) * 1964-03-09 1965-08-17 United States Steel Corp Method of regulating the discharge of molten metal from ladles
US3565412A (en) * 1968-12-03 1971-02-23 Dresser Ind Device for stirring molten metal
IT1156736B (en) * 1978-05-12 1987-02-04 Centro Speriment Metallurg METHOD FOR THE INTRODUCTION OF BONES-DESULPHANTS SUBSTANCES UNDER FLOATING METALS WITHOUT USING GASEOUS VEHICLES
US4682718A (en) * 1983-08-16 1987-07-28 Toshiba Ceramics Co., Ltd. Nozzle for continuous casting of molten steel
JPS6246167A (en) * 1985-08-22 1987-02-28 株式会社東芝 Defrost device
US4870037A (en) * 1987-09-23 1989-09-26 Vesuvius Crucible Company Prevention of Al2 O3 formation in pouring nozzles and the like
US5185300A (en) * 1991-03-11 1993-02-09 Vesuvius Crucible Company Erosion, thermal shock and oxidation resistant refractory compositions
GB2263427A (en) * 1992-01-09 1993-07-28 Thor Ceramics Ltd Refractory stopper rod with a lined channel
JP2627473B2 (en) * 1992-07-15 1997-07-09 新日本製鐵株式会社 Long stopper for continuous casting
FR2695848B1 (en) * 1992-09-21 1994-12-09 Lorraine Laminage Metal casting nozzle and methods of manufacturing this nozzle.
US5370370A (en) * 1993-02-19 1994-12-06 Vesuvius Crucible Company Liner for submerged entry nozzle
US5681499A (en) * 1994-06-15 1997-10-28 Vesuvius Crucible Company Method and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefrom
IN191421B (en) * 1994-06-15 2003-11-29 Vesuvius Frnance Sa
JP2796524B2 (en) * 1996-04-11 1998-09-10 品川白煉瓦株式会社 Composite immersion nozzle
KR100585977B1 (en) * 1998-11-20 2006-06-07 비수비우스 크루서블 컴패니 Stopper rod
WO2000078484A1 (en) * 1999-06-22 2000-12-28 Foseco International Limited Article formed from carbon-bonded refractory material
JP3426177B2 (en) * 1999-12-28 2003-07-14 明智セラミックス株式会社 Casting stopper
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US6475426B1 (en) * 2001-03-27 2002-11-05 Vesuvius Crucible Company Resin-bonded liner

Also Published As

Publication number Publication date
DE602005003968T2 (en) 2008-12-04
AR050257A1 (en) 2006-10-11
RU2375150C2 (en) 2009-12-10
AU2005263118A1 (en) 2006-01-26
MY141417A (en) 2010-04-30
EP1789220A2 (en) 2007-05-30
WO2006007672A3 (en) 2006-03-02
CN1988972A (en) 2007-06-27
CA2572497C (en) 2012-05-01
WO2006007672A2 (en) 2006-01-26
ATE381402T1 (en) 2008-01-15
MX2007000764A (en) 2007-03-28
DE602005003968D1 (en) 2008-01-31
JP2008506536A (en) 2008-03-06
KR101128610B1 (en) 2012-03-26
BRPI0513258B1 (en) 2016-09-27
RU2007100205A (en) 2008-08-27
TWI357837B (en) 2012-02-11
CA2572497A1 (en) 2006-01-26
US20070210494A1 (en) 2007-09-13
ES2299056T3 (en) 2008-05-16
JP4933430B2 (en) 2012-05-16
BRPI0513258A (en) 2008-04-29
UA89642C2 (en) 2010-02-25
ZA200700750B (en) 2008-08-27
PL1789220T3 (en) 2008-07-31
TW200615062A (en) 2006-05-16
EP1789220B1 (en) 2007-12-19
KR20070030913A (en) 2007-03-16

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Legal Events

Date Code Title Description
FGA Letters patent sealed or granted (standard patent)
MK14 Patent ceased section 143(a) (annual fees not paid) or expired