CA2572497C - Stopper rod for delivering gas into a molten metal - Google Patents

Stopper rod for delivering gas into a molten metal Download PDF

Info

Publication number
CA2572497C
CA2572497C CA2572497A CA2572497A CA2572497C CA 2572497 C CA2572497 C CA 2572497C CA 2572497 A CA2572497 A CA 2572497A CA 2572497 A CA2572497 A CA 2572497A CA 2572497 C CA2572497 C CA 2572497C
Authority
CA
Canada
Prior art keywords
stopper rod
layer
stopper
gas
internal chamber
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 - Fee Related
Application number
CA2572497A
Other languages
French (fr)
Other versions
CA2572497A1 (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 CA2572497A1 publication Critical patent/CA2572497A1/en
Application granted granted Critical
Publication of CA2572497C publication Critical patent/CA2572497C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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)
  • Furnace Charging Or Discharging (AREA)
  • Continuous Casting (AREA)
  • Furnace Details (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to 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.
The stopper rod of the invention does not contaminate the gas passing therethrough.

Description

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-Ai-00/30785 and WO-A1-00/30786 and more recently in WO-Ai-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.
[0007] 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-Ai-5,681,499, such a layer is only provided on portions that are always CONFIRMATION COPY

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 whole 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, 10 to 20 wt. %
graphite and 2 to 10 wt. % of silicon carbide. Such a material is essentially constituted of non-oxides species or non-reducible 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 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 5.

Claims (9)

1. Stopper rod adapted to deliver gas during pouring of molten metal comprising a stopper body having an internal chamber (1) and a gas discharge port (2), a bore (3) connecting the internal chamber (1) to the gas discharge port (2), the internal chamber (1) and the bore (3) defining a gas passageway, characterized in that the walls of the gas passageway are provided with a layer (4) which will not produce carbon monoxide at the temperature of use.
2. Stopper rod according to claim 1, characterized in that the layer (4) is a liner copressed with the body.
3. Stopper rod according to claim 1, characterized in that the layer (4) is a coating applied on the walls of the gas passageway.
4. Stopper rod according to claim 1, characterized in that the layer (4) 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 (5) 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 (4) is selected from the groups of a) materials which do not contain carbon;
b) materials essentially constituted of non reducible refractory oxides;
c) materials comprising elements which will react with the generated carbon monoxide, and mixtures thereof.
7. Stopper rod according to any one of claims 1 to 6, characterized in that the layer (4) 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 and a metal rod (5) used to attach the stopper rod to a rigging device, wherein the stopper rod is according to any one of claims 1 to 7, and wherein the metal rod (5) extends beyond the highest point of the layer (4).
9. Assembly according to claim 8, wherein a sealing gasket (6) is inserted around the lower end of the metal rod (5).
CA2572497A 2004-07-20 2005-07-15 Stopper rod for delivering gas into a molten metal Expired - Fee Related CA2572497C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04447179.5 2004-07-20
EP04447179 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
CA2572497A1 CA2572497A1 (en) 2006-01-26
CA2572497C true CA2572497C (en) 2012-05-01

Family

ID=34933070

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2572497A Expired - Fee Related CA2572497C (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 (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007019036U1 (en) * 2007-01-26 2010-06-17 Innotec Ltd. Plug for controlling the inflow of liquid metal from a container into a casting plant
ES2351075T3 (en) * 2008-11-19 2011-01-31 REFRACTORY INTELLECTUAL PROPERTY GMBH & CO. KG PLUG BODY.
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
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

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 Defroster
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
IN191421B (en) * 1994-06-15 2003-11-29 Vesuvius Frnance Sa
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
JP2796524B2 (en) * 1996-04-11 1998-09-10 品川白煉瓦株式会社 Composite immersion nozzle
CZ20011647A3 (en) * 1998-11-20 2001-10-17 Vesuvius Crucible Company 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
KR20020054132A (en) * 2000-12-27 2002-07-06 이구택 Gas channel typed stopper and continuous casting method using it
US6475426B1 (en) * 2001-03-27 2002-11-05 Vesuvius Crucible Company Resin-bonded liner

Also Published As

Publication number Publication date
ATE381402T1 (en) 2008-01-15
EP1789220A2 (en) 2007-05-30
AR050257A1 (en) 2006-10-11
BRPI0513258A (en) 2008-04-29
KR101128610B1 (en) 2012-03-26
TWI357837B (en) 2012-02-11
MY141417A (en) 2010-04-30
JP4933430B2 (en) 2012-05-16
JP2008506536A (en) 2008-03-06
BRPI0513258B1 (en) 2016-09-27
AU2005263118B2 (en) 2009-02-19
DE602005003968T2 (en) 2008-12-04
RU2007100205A (en) 2008-08-27
MX2007000764A (en) 2007-03-28
DE602005003968D1 (en) 2008-01-31
RU2375150C2 (en) 2009-12-10
KR20070030913A (en) 2007-03-16
PL1789220T3 (en) 2008-07-31
ZA200700750B (en) 2008-08-27
ES2299056T3 (en) 2008-05-16
TW200615062A (en) 2006-05-16
AU2005263118A1 (en) 2006-01-26
CN1988972A (en) 2007-06-27
WO2006007672A2 (en) 2006-01-26
CA2572497A1 (en) 2006-01-26
EP1789220B1 (en) 2007-12-19
US20070210494A1 (en) 2007-09-13
WO2006007672A3 (en) 2006-03-02
UA89642C2 (en) 2010-02-25

Similar Documents

Publication Publication Date Title
CA2572497C (en) Stopper rod for delivering gas into a molten metal
US20160039719A1 (en) Zirconia based coating for refractory elements and refractory element comprising of such coating
US5681499A (en) Method and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefrom
ZA200503078B (en) Permeable refractory material for a gas purged nozzle
CA2185627C (en) Long nozzle for continuous casting
AU2002309507B2 (en) Refactory article having a resin-bonded liner
EP1401599B2 (en) Stopper rod
AU2002309507A1 (en) Refactory article having a resin-bonded liner
AU2002315575A1 (en) Stopper rod
GB2247637A (en) Stoppers for use in molten metal handling
CA2497298A1 (en) Gas purged nozzle
JPH04270037A (en) Nozzle for continuous casting
WO2007085465A1 (en) Nozzle for the transfer of molten metal
JP4145164B2 (en) Sliding gate plate
JP4377002B2 (en) Gas injection upper nozzle for molten metal container open / close nozzle
JPS642468B2 (en)
JP2002346733A (en) Sliding nozzle plate for continuous casting

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20180716