WO1988006500A1 - Produit refractaire tubulaire - Google Patents

Produit refractaire tubulaire Download PDF

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Publication number
WO1988006500A1
WO1988006500A1 PCT/GB1988/000139 GB8800139W WO8806500A1 WO 1988006500 A1 WO1988006500 A1 WO 1988006500A1 GB 8800139 W GB8800139 W GB 8800139W WO 8806500 A1 WO8806500 A1 WO 8806500A1
Authority
WO
WIPO (PCT)
Prior art keywords
pouring
refractory
graphite
aperture
component
Prior art date
Application number
PCT/GB1988/000139
Other languages
English (en)
Inventor
Stephen John Lee
Original Assignee
Thor Ceramics Limited
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10613134&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1988006500(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Thor Ceramics Limited filed Critical Thor Ceramics Limited
Priority to AT88902156T priority Critical patent/ATE90896T1/de
Publication of WO1988006500A1 publication Critical patent/WO1988006500A1/fr
Priority to GB8919031A priority patent/GB2229662B/en

Links

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
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/28—Plates therefor
    • 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

Definitions

  • This invention relates to a refractory product for use in continuous casting. More particularly the invention is concerned with tubular refractory products for use in pouring of melt from the tundish to the mould.
  • Flow of melt from the tundish into a mould is commonly controlled by raising or lowering of a refractory stopper rod from or to a seating position in the base of the tundish where there is located either a fixed sub-entry nozzle (SEN) or a tundish nozzle, built into the tundish base, onto which a sub entry shroud (SES). is fastened.
  • SEN sub-entry nozzle
  • SES sub entry shroud
  • the present systems use an upper nozzle having a seating position to receive a flow control stopper located within a well block fixed into the tundish lining against which a stationary plate is fitted and incorporating a suitable jointing arrangement between the two components.
  • a lower assembly is held in place against the underside of this stationary plate by the tube changer mechanism and comprises a moving plate and submerged pouring shroud jointed by a suitable arrangement and retained within a strengthening steel shell which serves to hold the two components firmly together and to withstand the pressures transmitted by the operating piston.
  • An object of the present invention is to obviate or mitigate the aforementioned problems by providing improved pouring tubes suitable for use in conjunction with bottom pouring metallurgical vessels and existing tube changers thereby obviating the need for further development of the changer mechanisms.
  • the present invention provides a refractory pouring-assembly component comprising an elongate tubular body having a throughbore for use with a tube changing mechanism to provide a replaceable means for pouring of molten metal during continuous casting from a tundish into a mould
  • the refractory pouring component is an isostatically pressed, heat- and wear-resisting refractory one-piece composite body which is shaped to provide at one end a smooth, flat plate surface in which there is defined an aperture, the peripheral edge around said aperture being formed of a hard refractory material to provide an edge which during a tube changing operation is capable of cutting a skin or shell of solidified melt formed within the
  • the said component is formed from silicon nitride-bonded or silicon oxy-nitride-bonded materials selected from alumina/graphite, zirconia/graphite, magnesia/graphite or appropriate mixtures thereof. In this way a single component having a substantially uniform composition meeting the defined use requirements can be made.
  • an.annulus around the aperture in the flat plate surface is made from a material having the requisite strength, thermal shock resistance and physical compatibility with the remaining plate and SES body material.
  • a specifically formulated 1 2 0_ SiOfact ZiO, C material is suitable within an alumina graphite host body. This of course requires controlled packing of the isostatic-pressing mould in a manner known per se using materials selected in accordance with this invention.
  • the components of this material are usually such that the alumina exceeds about 45% by weight, silica and zirconia are in lesser amounts such that the zirconia may exceed the quantity of silica and still allow a small quantity of carbon to be included.
  • a desirable composition comprises 53% alumina, 18% silica, 24% zirconia and 3% carbon with the balance being minor amounts of typical materials used in this art.
  • this alternative arrangement it is not necessary to rely on silicon nitride or silicon-oxy-nitride bonding.
  • this invention approaches the problem of imperfect seals with a new solution in that totally new refractory components are used in the pouring assembly.
  • Each of the previously used sliding upper and lower plates of the tube changer system, the tundish bottom nozzle or block and the pouring tube is now replaced.
  • two components are provided by this invention. Thereby eliminating two of the troublesome joints in the pouring/changer assembly.
  • the plates of the tube changer have to be sufficiently hard as to be able to sever cleanly the frozen melt skin or shell formed during pouring of melt through the assembly whilst the pouring tube leading from the changer plates into the mould must be capable of withstanding thermal shocks.
  • These requirements are generally considered to be opposing in that a material having suitable hardness characteristics is of generally poor resistance to thermal shock and vice versa.
  • a refractory component having the requisite hardness and thermal shock resistant properties using the above-mentioned materials or the like.
  • the invention may be applied to the upper tube changer fixed plate/tundish block or nozzle parts of the pouring assembly or to the lower sliding plate/pouring tube parts of the pouring assembly. Best advantages are obtained with replacement of all known components with the new composite components of this invention.
  • Fig. 1 is a section through a conventional lower slide plate of a tube changer ?
  • Fig. 2 is a section through a conventional pouring tube adapted to mate with the lower slide plate shown in Fig.l
  • SUBSTITUTE SHEET Fig. 3 is a section through a pouring tube of this invention which replaces the components shown in Figs. 1 and
  • Fig.4 is a section through a pouring nozzle with integral upper changer plate for fixing in the bottom of a tundish to form the upper part of a pouring assembly provided in accordance with this invention?
  • Fig.5 is a section through a pouring component (SES) with integral lower slide changer plate for presentation to a corresponding upper plate in an upper part of a pouring assembly provided in accordance with this invention
  • Fig. 6 is a section through a pouring component (SES) similar in function to that of Fig. 5 but comprising an-annular co-pressed enhanced-characteristic material within a conventional alumina graphite body having a conventional zirconia slag-wear-resisting band.
  • SES pouring component
  • a refractory pouring body (1) having a throughbore (2), for use with a tube changing mechanism to provide a replaceable means for pouring of molten metal during continuous casting from a tundish into a casting mould is isostatically pressed from powder refractory materials and binders selected to impart heat- and wear-resisting properties -to the refractory one-piece composite body (1) which is formed by the isostatic pressing.
  • the pressing operation to mould the refractory powder material is carried out in a manner generally known per se using a flexible mould to provide a shaped refractory body (1) having at one end of the body a flat plate surface (3) whilst the remainder of the body (1) is of generally cylindrical shape.
  • Arbors and sacrificial void formers are inserted in the mould which is packed with the powder refractory/binder materials in order to provide in the pressed composite an axial throughbore (2) extending from an aperture (4) in the plate (3) to divergent outlets (5) at the tip (6) of the pouring body (1).
  • SUBSTITUTESHE refractory materials from alumina graphite, zirconia graphite or magnesia graphite, using silicon-nitride (Si_N,) or silicon oxy-nitride (Si ⁇ ON..) as binder, with appropriate filling and packing of the mould it is possible to ensure that the peripheral edge (3') around said aperture (4) provides an edge which during a tube changing operation is capable of cutting a skin or shell of solidified melt formed within the throughbore of the pouring assembly during pouring of molten metal therethrough and that the body (1) is formed of a thermal shock-resistant material.
  • a band (7) of wear-resistant refractory material such zirconia or high zirconia/graphite mix is provided in a manner known per se.
  • a protective metal can (8) is fitted after normal finishing of the refractory composite. These finishing steps may include fine grinding of the plate surface (3) .
  • the tube changer handles the composite refractory in much the same way as for the known two part assembly, using the underside of the metal can (8) to receive thrust to locate and support the composite pouring tube for use beneath either the conventional two part upper changer plate and tundish nozzle or the new composite of this invention as will be described hereinbelow.
  • a refractory pouring nozzle (21) for location in the well block (20) in the bottom of a tundish (19), has a throughbore (22) and an integrally formed plate surface (23) for use with a tube changing mechanism during continuous casting from a tundish into a casting mould is isostatically pressed from powder refractory materials and binders selected (as discussed hereinbefore) to impart heat- and wear-resisting properties to the refractory one-piece composite body (21) which is formed by the isostatic pressing.
  • the pressing operation to mould the refractory powder material is carried out in a manner generally known per se using a flexible mould to provide a shaped refractory body (21) having at one end of the body a flat plate surface (23) whilst the remainder of the body (21) is optionally of tapered or cylindrical shape. Arbors and sacrificial void formers (if necessary) are inserted in the mould which is packed with the powder refractory/binder materials in order to provide in the pressed composite an axial throughbore (22) extending from an aperture (24) in the plate (23) to inlet (25) having a shape adapted to provide a seating surface (26) for a stopper (not shown) .
  • refractory materials from alumina graphite, zirconia graphite or magnesia graphite, bonded using silicon nitride or silicon oxy-nitride, with appropriate filling and packing of the mould it is possible to ensure that the peripheral edge (23*) around said aperture (24) provides an edge which during a tube changing operation is capable of cutting a skin or shell of solidified melt formed within the throughbore of the pouring assembly during pouring of molten metal therethrough whilst the body (21) may be optionally formed of a thermal shock- resistant material. Normal finishing of the refractory which may include fine grinding of the plate surface (23) is carried out.
  • FIG.5 of the drawings A further embodiment of the invention is shown in Fig.5 of the drawings.
  • a submerged entry shroud SES
  • SES submerged entry shroud
  • it is formed in a manner generally equivalent to that described in Example 1 to provide a refractory pouring body (31) with a throughbore (32) and at one end of the body (31) a flat plate surface (33) whilst the remainder of the body (31) is of generally cylindrical shape for use wi.th a tube changing mechanism as described before.
  • the peripheral edge (33') around said aperture (34) provides an edge which during a tube changing operation is capable of cutting a skin or shell of solidified melt formed within the
  • a protective metal can (38) is fitted, and normal finishing of the refractory composite which may additionally include fine grinding of the plate surface (33) is carried out.
  • the composition chosen includes 53% alumina, 18% silica, 24% zirconia and 3% carbon (as graphite) with the balance being minor amounts of typical materials used in this art.
  • this embodiment is similar to that of Example 3 and parts thereof are numbered in an analogous fashion. Since this unit is manufactured in a single co-pressing step there is no risk of steel penetration at. the interface.

Abstract

Un composant réfractaire d'un ensemble de coulage (1; 21; 31; 41), destiné à être utilisé avec un mécanisme de changeur de tuyau, se compose d'un corps tubulaire allongé ayant un trou traversant (2; 22; 32; 42) destiné à être utilisé avec un mécanisme de changement de tuyau, offrant un moyen remplaçable pour couler du métal en fusion pendant le coulage continu à partir d'un avant-creuset (19), dans un moule dans lequel le composant de coulée réfractaire résistant à la chaleur et à l'usure, pressé isostatiquement, qui est moulé pour avoir, à une extrémité, une surface (3; 23; 33; 43) de plaque plate, dans laquelle est définie une ouverture (4; 24; 34; 44), le bord périphérique (3'; 23'; 33'; 43') autour de ladite ouverture étant formé d'un matériau réfractaire dur pour donner un bord qui, pendant l'opération de changement de tuyau peut couper une peau de fonderie, ou l'enveloppe d'une fonte solidifiée formée dans le trou traversant (2; 22; 32; 42) de l'ensemble de coulage, pendant le coulage du métal en fusion à travers le trou traversant, pendant que le restant dudit corps est moulé en unne forme tubulaire à partir d'un matériau résistant aux chocs thermiques, pour permettre le coulage de la fonte. Les compositions dudit composant peuvent être des mélanges uniformes de matériau réfractaire, lié par nitrure de silicium ou par oxy-nitrure de silicium, ou une couronne de matériaux durs sélectionnés dans un corps hôte de graphite/dioxyde d'aluminium.
PCT/GB1988/000139 1987-02-28 1988-02-29 Produit refractaire tubulaire WO1988006500A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT88902156T ATE90896T1 (de) 1987-02-28 1988-02-29 Feuerfestes rohrfoermiges produkt.
GB8919031A GB2229662B (en) 1987-02-28 1989-08-14 Tubular refractory product

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8704764 1987-02-28
GB878704764A GB8704764D0 (en) 1987-02-28 1987-02-28 Tubular refractory product

Publications (1)

Publication Number Publication Date
WO1988006500A1 true WO1988006500A1 (fr) 1988-09-07

Family

ID=10613134

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1988/000139 WO1988006500A1 (fr) 1987-02-28 1988-02-29 Produit refractaire tubulaire

Country Status (5)

Country Link
EP (1) EP0346378B1 (fr)
AT (1) ATE90896T1 (fr)
DE (1) DE3882041T2 (fr)
GB (2) GB8704764D0 (fr)
WO (1) WO1988006500A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635030A1 (fr) * 1988-07-18 1990-02-09 Vesuvius France Sa Organe de coulee et son procede de fabrication
FR2643001A1 (fr) * 1989-01-05 1990-08-17 Vesuvius Sa Organe de coulee comportant une surface plane de glissement pour une plaque tiroir associee
BE1006006A3 (fr) * 1990-12-19 1994-04-19 Int Ind Eng Sa Piece refractaire pour trou de coulee d'un recipient siderurgique.
WO2000032337A1 (fr) * 1998-11-27 2000-06-08 Didier-Werke Ag Ameliorations concernant des produits refractaires
WO2001081028A1 (fr) * 2000-04-21 2001-11-01 Vesuvius Crucible Company Buse de coulee en une piece et dispositif de serrage pour maintenir une telle buse
WO2001091950A1 (fr) * 2000-05-29 2001-12-06 Rotary Nozzle International S.A. Plaque refractaire
WO2006029905A2 (fr) * 2004-09-16 2006-03-23 Vesuvius Crucible Company Procede de fabrication d'un article refractaire, article refractaire et dispositif de pressage

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003608C1 (fr) * 1990-02-07 1991-06-27 Didier-Werke Ag, 6200 Wiesbaden, De
US5954989A (en) * 1997-03-20 1999-09-21 Vesuvius Crucible Company Erosion and abrasion resistant refractory composition and article made therefrom
JP3506655B2 (ja) † 2000-04-28 2004-03-15 明智セラミックス株式会社 連続鋳造ノズル
CN104540619A (zh) 2012-09-11 2015-04-22 里弗雷克特里知识产权两合公司 耐火浇铸装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347133A1 (fr) * 1976-04-09 1977-11-04 Didier Werke Ag Procede pour la fabrication d'une plaque de tiroir pour l'ouverture de coulee de poches metallurgiques
US4108675A (en) * 1975-01-29 1978-08-22 Nippon Kokan Kabushiki Kaisha Brick for sliding closure of vessel for holding molten metal
DE2816283A1 (de) * 1977-04-15 1978-10-26 Uss Eng & Consult Feuerfestes absperrventil
FR2388621A1 (fr) * 1977-04-29 1978-11-24 Didier Werke Ag Plaque refractaire pour fermeture a tiroir de recipient metallurgique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6014060A (ja) * 1983-07-06 1985-01-24 株式会社日立製作所 差圧式三方弁

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4108675A (en) * 1975-01-29 1978-08-22 Nippon Kokan Kabushiki Kaisha Brick for sliding closure of vessel for holding molten metal
FR2347133A1 (fr) * 1976-04-09 1977-11-04 Didier Werke Ag Procede pour la fabrication d'une plaque de tiroir pour l'ouverture de coulee de poches metallurgiques
DE2816283A1 (de) * 1977-04-15 1978-10-26 Uss Eng & Consult Feuerfestes absperrventil
FR2388621A1 (fr) * 1977-04-29 1978-11-24 Didier Werke Ag Plaque refractaire pour fermeture a tiroir de recipient metallurgique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, volume 5, no. 61 (M-65)(733), 24 april 1981; & JP-A-5614060 (KUROSAKI YOUGIYOU K.K.) 10 February 1981 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635030A1 (fr) * 1988-07-18 1990-02-09 Vesuvius France Sa Organe de coulee et son procede de fabrication
FR2643001A1 (fr) * 1989-01-05 1990-08-17 Vesuvius Sa Organe de coulee comportant une surface plane de glissement pour une plaque tiroir associee
BE1006006A3 (fr) * 1990-12-19 1994-04-19 Int Ind Eng Sa Piece refractaire pour trou de coulee d'un recipient siderurgique.
WO2000032337A1 (fr) * 1998-11-27 2000-06-08 Didier-Werke Ag Ameliorations concernant des produits refractaires
WO2001081028A1 (fr) * 2000-04-21 2001-11-01 Vesuvius Crucible Company Buse de coulee en une piece et dispositif de serrage pour maintenir une telle buse
US6772922B2 (en) 2000-04-21 2004-08-10 Vesuvius Crucible Company One-piece inner nozzle and clamping device for holding such a nozzle
WO2001091950A1 (fr) * 2000-05-29 2001-12-06 Rotary Nozzle International S.A. Plaque refractaire
BE1013540A3 (fr) * 2000-05-29 2002-03-05 Rotary Nozzle Internat S A Plaque refractaire.
WO2006029905A2 (fr) * 2004-09-16 2006-03-23 Vesuvius Crucible Company Procede de fabrication d'un article refractaire, article refractaire et dispositif de pressage
WO2006029905A3 (fr) * 2004-09-16 2006-06-22 Vesuvius Crucible Co Procede de fabrication d'un article refractaire, article refractaire et dispositif de pressage

Also Published As

Publication number Publication date
GB8919031D0 (en) 1989-11-08
GB2229662A (en) 1990-10-03
GB8704764D0 (en) 1987-04-01
GB2229662B (en) 1991-03-06
EP0346378A1 (fr) 1989-12-20
DE3882041D1 (de) 1993-07-29
EP0346378B1 (fr) 1993-06-23
ATE90896T1 (de) 1993-07-15
DE3882041T2 (de) 1993-10-21

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