US20020011696A1 - Tundish impact pad - Google Patents

Tundish impact pad Download PDF

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Publication number
US20020011696A1
US20020011696A1 US09/917,797 US91779701A US2002011696A1 US 20020011696 A1 US20020011696 A1 US 20020011696A1 US 91779701 A US91779701 A US 91779701A US 2002011696 A1 US2002011696 A1 US 2002011696A1
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US
United States
Prior art keywords
sidewall
tundish
impact pad
impact
porous
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.)
Abandoned
Application number
US09/917,797
Inventor
Michael Clark
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.)
Foseco International Ltd
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Foseco International Ltd
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 GBGB9903937.2A priority Critical patent/GB9903937D0/en
Priority to GB9903937.2 priority
Priority to PCT/GB2000/000518 priority patent/WO2000050190A1/en
Application filed by Foseco International Ltd filed Critical Foseco International Ltd
Assigned to FOSECO INTERNATIONAL LIMITED reassignment FOSECO INTERNATIONAL LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CLARK, MICHAEL R.
Publication of US20020011696A1 publication Critical patent/US20020011696A1/en
Abandoned legal-status Critical Current

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    • 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
    • B22D41/003Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with impact pads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002Treatment with gases
    • B22D1/005Injection assemblies therefor

Abstract

A tundish impact pad formed from refractory material is disclosed, the impact pad comprising a base having an impact surface which in use faces upwardly to receive molten metal, e.g. steel, poured onto the impact pad, and a sidewall extending upwardly from at least part of the periphery of the impact surface. At least part of the interior, and a surface, of the sidewall are porous and the impact pad includes means for supplying a gas, e.g. argon, to the porous interior of the sidewall, to enable the gas to be supplied to the molten metal from the porous surface of the sidewall. The tundish impact pad may be used during the continuous casting of steel.

Description

  • This invention relates to the handling of molten metal, especially steel. In particular, the invention relates to a tundish impact pad, i.e. an article formed from refractory material to be placed on the floor of a tundish to receive an incoming stream of molten metal poured into the tundish from a ladle. The invention has particular utility in the continuous casting of steel. [0001]
  • International Patent Application No. WO 96/14951 (FOSECO) discloses a tundish impact pad comprising a body of refractory material capable of withstanding contact with molten steel in a tundish. The impact pad body comprises a base having an impact surface, an outer sidewall extending upwardly from the impact surface, and a top surface connected to the sidewall and defining an opening therein. The top surface has an inner annular portion substantially parallel to the impact surface, and there is a substantially right angled corner between the sidewall and the impact surface, and also between the sidewall and the inner annular portion of the top surface. [0002]
  • U.S. Pat. No. 4,468,012 discloses a device for removing inclusions from a molten metal which is poured into a casting tundish. The device comprises long blocks of heat-insulating material which is sinterable at the temperature of the molten metal and which comprises inorganic particles incorporated in an organic binder which is decomposable at the temperature of the molten metal so as to form pores in the heat-insulating material. A duct extends through each long block, for the supply of an inert gas which diffuses into the molten metal through the pores in the heat-insulating material. [0003]
  • U.S. Pat. No. 5,054,749 discloses a tundish for the continuous casting of steel, comprising a permanent refractory cast on a sheet metal frame defining an external wall of the tundish. In the bottom of the tundish there is a gas chamber and a porous refractory wear plate surmounting and extending over the chamber. A gas inlet duct extends from an upper edge of the tundish and down through the permanent refractory to the gas distribution chamber. [0004]
  • United Kingdom Patent Application No. 2164281A discloses a tundish used in a steel making process, which includes a replaceable refractory lining disposed on the inner surface of the bottom and side walls of the tundish. A porous refractory tile is supported upon the upper surface of the refractory lining and has a major axis extending substantially the entire width of the tundish. The porous tile encapsulates a perforated conduit for supplying inert gas which is allowed to emanate from the tile across the width of the tundish, to remove unwanted inclusions from the steel. The tile has a ramp-like surface for deflecting steel flowing towards it upwardly in the tundish. The tundish also includes an impact pad upstream of the tile. [0005]
  • According to a first aspect, the present invention provides a tundish impact pad formed from refractory material, the impact pad comprising a base having an impact surface which in use faces upwardly to receive molten metal poured onto the impact pad, and a sidewall extending upwardly from at least part of the periphery of the impact surface, characterised in that at least part of the interior, and a surface, of the sidewall are porous, and the impact pad includes means for supplying a gas to the porous interior of the sidewall, to enable the gas to be supplied to the molten metal from the porous surface of the sidewall. [0006]
  • According to a second aspect, the invention provides a kit of parts for assembly to form a tundish impact pad, comprising: [0007]
  • (a) a base part formed from refractory material and having an impact surface for receiving molten metal poured onto the impact pad in use; and [0008]
  • (b) a peripheral sidewall part formed from refractory material, for attachment directly or indirectly to the base part to form at least part of a sidewall around at least part of the periphery of the impact surface; characterised in that at least part of the interior, and a surface, of the sidewall part are porous, and the base part and/or the sidewall part include(s) means for supplying a gas to the porous interior of the sidewall part, to enable gas to be supplied to the molten metal from the porous surface of the sidewall part. [0009]
  • According to a third aspect, the invention provides a tundish for containing molten metal, the tundish comprising a floor and sidewalls formed from refractory material, and further comprising an outlet for the molten metal, characterised in that the tundish contains an impact pad according to the first aspect of the invention or assembled from a kit of parts according to the second aspect of the invention, placed on the floor of the tundish. [0010]
  • The gas is preferably an inert gas, e.g. argon or nitrogen, and is preferably supplied to the molten metal for the purpose of removing unwanted inclusions from the metal. [0011]
  • According to a fourth aspect, the invention provides a method of removing inclusions from molten metal in a tundish, by means of tundish impact pad according to the first aspect of the invention or assembled from a kit of parts according to the second aspect of the invention, the method comprising supplying a gas to the molten metal from the porous sidewall of the impact pad. [0012]
  • The expression “porous” is intended to include any arrangement in which at least part of the sidewall is able to supply gas to the molten metal from the interior of the sidewall. For example, pores, channels or other apertures in the sidewall may generally have any shape, for example they may be generally round, or elongate, in cross-section, thus appearing in the form of round holes or slits, respectively, on the surface of the sidewall. Furthermore, the porosity of the sidewall may be in the form of an irregular network of pores, or it may be in the form of a substantially regular structure of channels, for example. [0013]
  • The invention has the advantage that because the gas is supplied to the molten metal in the tundish from the sidewall of the impact pad, it may provide a kind of “curtain” of gas bubbles surrounding the impact surface of the pad (or at least part of the impact surface). This means that molten metal poured into, and subsequently flowing out of, the impact pad will normally flow through the gas curtain, and furthermore the gas will come into contact with the molten metal very soon after the metal has been poured into the tundish. The gas therefore has substantially the longest possible contact time with the molten metal, and will generally be carried with the metal as it flows away from the impact pad. This generally leads to a more efficient incorporation of the gas into the metal, and therefore a more efficient removal of unwanted inclusions, for example. [0014]
  • In some preferred embodiments of the invention, the sidewall of the impact pad is porous at least in an upper portion thereof. Preferably, at least part of an upper surface of the sidewall is porous. [0015]
  • The sidewall may include an inwardly projecting ledge, which is preferably located substantially at the top of the sidewall (but which may, alternatively, project from the side of the sidewall). By “inwardly projecting” is meant projecting over at least part of the impact surface of the impact pad. At least a central region of the impact surface is preferably substantially planar, and substantially horizontal in use. In such embodiments, the ledge is preferably substantially parallel to the planar region of the impact surface. [0016]
  • For embodiments of the invention which include an inwardly projecting ledge, at least part of the porosity of the sidewall may advantageously comprise at least part of the ledge, and preferably at least an upper surface thereof. For example, substantially the entire upper surface of the sidewall, including the upper surface of an inwardly projecting ledge, may be porous. The inwardly projecting ledge may, for example, comprise an upper portion which is porous and a lower portion which is substantially non-porous. Alternatively, the ledge may comprise upper and lower porous portions and a substantially non-porous intermediate portion. [0017]
  • Additionally or alternatively, at least part of the porosity of the sidewall may be provided by a portion of the sidewall located between the base and an upper portion of the sidewall (e.g. a ledge)—i.e. the main body of the sidewall may provide at least part of the porosity of the sidewall. At least part of the inner and/or outer surface(s) of the sidewall may be porous, and therefore supply gas to the molten metal in use. [0018]
  • As mentioned above, the second aspect of the invention is a kit of parts for assembly to form a tundish impact pad. When reference is made in this specification to the base or sidewall of the impact pad according to the first aspect of the invention, it is to be understood that the reference also applies to the base part or sidewall part, respectively, of the kit of parts. Furthermore, as mentioned above, in some preferred embodiments of the impact pad, the sidewall includes an inwardly projecting ledge. When such embodiments of the impact pad are provided as a kit of parts, in accordance with the second aspect of the invention, the inwardly projecting ledge may comprise an integral part of the sidewall part, or it may comprise a further separate part, i.e. a further sidewall part of the kit. [0019]
  • The means for supplying a gas to the interior of the sidewall preferably comprises one or more conduits. The term “conduit” is intended to include “pipe”, “channel”, “duct” and the like. The or each conduit is preferably perforated along at least part of its length, in order to release the gas. The gas is therefore preferably supplied to substantially the entire porous region or regions of the sidewall (or the entire sidewall for embodiments in which the entire sidewall is porous). The impact pad therefore preferably includes one or more conduits (e.g. a network of conduits) for supplying the gas to the porous sidewall. For embodiments of the invention in which the sidewall extends around the entire periphery of the impact surface, the sidewall preferably includes at least one gas supply conduit extending through the entire length thereof (e.g. an endless conduit). [0020]
  • The tundish preferably includes one or more gas supply conduits for supplying the gas to the impact pad. In use, at least one conduit in the tundish is preferably connected to a respective conduit in the impact pad. The connection between a tundish gas supply conduit and an impact pad conduit may, for example, be made at the base of the impact pad, or at the sidewall of the impact pad, depending upon the design of the tundish and the arrangement of the impact pad within the tundish. For arrangements in which part of the sidewall of the impact pad is located adjacent to a sidewall of the tundish, the conduit connection may conveniently be made at the impact pad sidewall for example, whereas for arrangements in which the impact pad is located a distance from the sides of the tundish, it may be more convenient for the conduit connection to be made at the base of the impact pad. In the latter case, the conduit connection may be underneath the base of the impact pad, but it is generally preferred for the connection to be made at a side of the base of the impact pad, the tundish conduit for example lying on the floor of the tundish and provided in a refractory block or under a refractory cover. The tundish conduit(s) is/are preferably connected to a gas source located to the exterior of the tundish.[0021]
  • The invention will now be described, by way of example, with reference to the accompanying drawings, of which: [0022]
  • FIG. 1 is a schematic illustration in cross section of a one-piece impact pad according to the invention; [0023]
  • FIG. 2 is a schematic illustration in cross section of a two-piece impact pad according to the invention; [0024]
  • FIG. 3 is a schematic illustration in cross section of a three piece impact pad according to the invention; and [0025]
  • FIG. 4 is a schematic illustration in cross section of a tundish containing an impact pad according to the invention.[0026]
  • FIG. 1 shows in cross-section a one-piece tundish impact pad [0027] 1 formed from concrete. The impact pad comprises a base 3 having an upwardly facing impact surface 5 for receiving molten metal poured onto the impact pad, and a sidewall 7 extending upwardly from the periphery of the impact surface. The impact pad is generally square or rectangular in plan view (but other shapes are of course possible, e.g. other quadrilateral shapes, or round, e.g. circular). An upper portion 9 of the sidewall 7 is formed from a porous concrete material. In use, a gas supply conduit (not shown) in the impact pad supplies a gas to the interior of the porous portion 9, and the gas permeates through the porous portion and is released as a “curtain” of gas bubbles emanating from the upper surface of the sidewall of the impact pad. The sidewall includes an inwardly projecting ledge 11, and part of the porous upper portion 9 of the sidewall comprises an upper part of this ledge.
  • FIG. 2 shows an impact pad similar to that shown in FIG. 1, with a porous upper portion [0028] 9, but this impact pad has been assembled from a kit of two main parts, namely a base part 13 comprising a base 3 and a lower region of sidewall 7, and a sidewall part 15 which constitutes an upper region of the sidewall, comprising the porous upper portion 9 and a non-porous portion 16. The two parts of the kit have been assembled and cemented together to form the impact pad.
  • FIG. 3 shows an impact pad similar to those shown in FIGS. 1 and 2, except that this impact pad has been assembled from a kit of three main parts, and it contains an additional porous portion in the sidewall. The kit comprised a base part [0029] 17, a lower sidewall part 19, and an upper sidewall part 15 (which is the same as that of FIG. 2), the parts having been assembled and cemented together to form the complete impact pad. The lower sidewall part 19 comprises a porous portion 23, and the upper sidewall portion comprises an upper porous portion 9 and a lower non-porous portion 16. The lower porous portion 23 releases the gas from its exterior and interior surfaces, i.e. the gas is released both into the interior of the tundish and to the exterior of the tundish. In combination with the upper porous portion 9 which releases the gas from the upper surface of the sidewall, the result is the production of a (radially) deeper “curtain” of gas bubbles surrounding the impact surface, compared to that produced by the impact pads shown in FIGS. 1 and 2.
  • FIG. 4 shows, schematically and in cross-section, a tundish [0030] 25 filled with molten steel 27 and containing an impact pad 1 according to the invention. The flow direction of the molten steel from a submerged entry shroud 29 onto the impact surface 5 of the impact pad, through bubbles of gas supplied by the impact pad and towards and through outlets 31 is indicated by the arrows. The gas supply conduits are not shown.

Claims (13)

1. A tundish impact pad formed from refractory material, the impact pad comprising a base having an impact surface which in use faces upwardly to receive molten metal poured onto the impact pad, and a sidewall extending upwardly from at least part of the periphery of the impact surface, characterised in that at least part of the interior, and a surface, of the sidewall are porous and the impact pad includes means for supplying a gas to the porous interior of the sidewall, to enable the gas to be supplied to the molten metal from the porous surface of the sidewall.
2. A kit of parts for assembly to form a tundish impact pad, comprising:
(a) a base part formed from refractory material and having an impact surface for receiving molten metal poured onto the impact pad in use; and
(b) a peripheral sidewall part formed from refractory material, for attachment directly or indirectly to the base part to form at least part of a sidewall around at least part of the periphery of the impact surface; characterised in that at least part of the interior, and a surface, of the sidewall part are porous, and the base part and/or the sidewall part include(s) means for supplying a gas to the porous interior of the sidewall part, to enable the gas to be supplied to the molten metal from the porous surface of the sidewall part.
3. A tundish for containing molten metal, the tundish comprising a floor and sidewalls formed from refractory material, and further comprising an outlet for the molten metal, characterised in that the tundish contains an impact pad according to claim 1 or an impact pad assembled from a kit according to claim 2, placed on the floor of the tundish.
4. A method of removing inclusions from molten metal in a tundish, by means of a tundish impact pad according to claim 1 or an impact pad assembled from a kit according to claim 2, the method comprising supplying a gas to the molten metal from the porous sidewall of the impact pad.
5. An impact pad, kit, tundish or method according to any preceding claim, in which the sidewall is porous in only an upper portion thereof.
6. An impact pad, kit, tundish or method according to any preceding claim, in which at least part of an upper surface of the sidewall is porous.
7. An impact pad, kit, tundish or method according to any preceding claim, in which the sidewall includes an inwardly projecting ledge.
8. An impact pad, kit, tundish or method according to claim 7, in which at least part of the porosity of the sidewall comprises at least part of the ledge.
9. An impact pad, kit, tundish or method according to any preceding claim, in which the means for supplying a gas to the interior of the sidewall comprises one or more conduits.
10. An impact pad, kit, tundish or method according to claim 9, in which the or each conduit is perforated along at least part of its length.
11. An impact pad, kit, tundish or method according to any preceding claim, in which the gas is an inert gas, preferably argon.
12. An impact pad, kit, tundish or method according to any preceding claim except claim 1 or claim 2, in which the tundish includes one or more gas supply conduits for supplying the gas to the impact pad.
13. An impact pad, kit, tundish or method according to claim 12 when dependent upon claim 9 or claim 10, in which at least one conduit in the tundish is connected to a respective conduit in the impact pad.
US09/917,797 1999-02-22 2001-07-31 Tundish impact pad Abandoned US20020011696A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GBGB9903937.2A GB9903937D0 (en) 1999-02-22 1999-02-22 Tundish impact pad
GB9903937.2 1999-02-22
PCT/GB2000/000518 WO2000050190A1 (en) 1999-02-22 2000-02-17 Tundish impact pad

Related Parent Applications (1)

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PCT/GB2000/000518 Continuation WO2000050190A1 (en) 1999-02-22 2000-02-17 Tundish impact pad

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US (1) US20020011696A1 (en)
EP (1) EP1154871A1 (en)
KR (1) KR20010102015A (en)
CN (1) CN1341047A (en)
AR (1) AR022638A1 (en)
AU (1) AU2559500A (en)
BG (1) BG105834A (en)
BR (1) BR0008398A (en)
CA (1) CA2363120A1 (en)
CZ (1) CZ20013032A3 (en)
GB (1) GB9903937D0 (en)
HU (1) HU0200132A2 (en)
PL (1) PL349362A1 (en)
SK (1) SK12012001A3 (en)
TR (1) TR200102438T2 (en)
WO (1) WO2000050190A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040256775A1 (en) * 2002-08-05 2004-12-23 Alexander Retsching Fire resistant ceramic part
EP1676659A1 (en) * 2002-03-28 2006-07-05 Foseco International Limited Impact pad for a tundish
US20070220459A1 (en) * 2006-03-06 2007-09-20 Mentor Graphics Corp. Capacitance extraction of intergrated circuits with floating fill
US20090152308A1 (en) * 2007-12-14 2009-06-18 Harrison Steel Castings Co. Turbulence Inhibiting Impact Well for Submerged Shroud or Sprue Poured Castings
US20180147624A1 (en) * 2015-08-17 2018-05-31 Nisshin Steel Co., Ltd. Annular weir

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20031356A1 (en) * 2003-07-02 2005-01-03 Danieli Off Mecc of molten metal in the crystallizer feed device.
CN102398024A (en) * 2010-09-17 2012-04-04 维苏威高级陶瓷(苏州)有限公司 Impacting box with enhanced impacting surface
EP2837441A4 (en) * 2012-06-18 2015-07-01 Jfe Steel Corp Method for manufacturing high-purity steel casting, and tundish
PL2865464T3 (en) * 2013-10-22 2016-08-31 Refractory Intellectual Property Gmbh & Co Kg Fireproof ceramic impact pad
DE102016214236A1 (en) * 2016-08-02 2018-02-08 Thyssenkrupp Ag Impact pot, device for casting a metallic melt and method for casting a metallic melt

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FR2516415B1 (en) * 1981-11-13 1984-06-22 Daussan & Co
US4619443A (en) * 1983-10-06 1986-10-28 Rand Steel Technology [Proprietary] Limited Gas distributing tundish barrier
GB2164281A (en) * 1984-09-18 1986-03-19 Dresser Ind Tundish with gas injection tile
FR2652023B1 (en) * 1989-06-16 1991-10-31 Air Liquide Continuous casting distributor of steel.
DE4205853C1 (en) * 1992-02-26 1993-10-14 Veitscher Magnesitwerke Ag Refractory ceramic prefabricated component for installation in a distributor
GB9212953D0 (en) * 1992-06-18 1992-07-29 Foseco Int Purifying molten metal
WO1996014951A1 (en) * 1994-11-09 1996-05-23 Foseco International Limited Tundish impact pad

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1676659A1 (en) * 2002-03-28 2006-07-05 Foseco International Limited Impact pad for a tundish
US20040256775A1 (en) * 2002-08-05 2004-12-23 Alexander Retsching Fire resistant ceramic part
US7128247B2 (en) * 2002-08-05 2006-10-31 Refractory Intellectual Property Gmbh & Co. Kg Fire resistant ceramic part
US20070220459A1 (en) * 2006-03-06 2007-09-20 Mentor Graphics Corp. Capacitance extraction of intergrated circuits with floating fill
US20090152308A1 (en) * 2007-12-14 2009-06-18 Harrison Steel Castings Co. Turbulence Inhibiting Impact Well for Submerged Shroud or Sprue Poured Castings
US8066935B2 (en) 2007-12-14 2011-11-29 The Harrison Steel Castings Company Turbulence inhibiting impact well for submerged shroud or sprue poured castings
US8383032B2 (en) 2007-12-14 2013-02-26 Harrison Steel Castings Company Turbulence inhibiting impact well for submerged shroud or sprue poured castings
US20180147624A1 (en) * 2015-08-17 2018-05-31 Nisshin Steel Co., Ltd. Annular weir
US10562094B2 (en) * 2015-08-17 2020-02-18 Nippon Steel Nisshin Co., Ltd. Annular weir

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SK12012001A3 (en) 2002-03-05
PL349362A1 (en) 2002-07-15
GB9903937D0 (en) 1999-04-14
HU0200132A2 (en) 2002-05-29
CZ20013032A3 (en) 2002-05-15
TR200102438T2 (en) 2002-01-21
BR0008398A (en) 2002-01-29
CN1341047A (en) 2002-03-20
AR022638A1 (en) 2002-09-04
EP1154871A1 (en) 2001-11-21
KR20010102015A (en) 2001-11-15
WO2000050190A1 (en) 2000-08-31
AU2559500A (en) 2000-09-14
BG105834A (en) 2002-04-30
CA2363120A1 (en) 2000-08-31

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Owner name: FOSECO INTERNATIONAL LIMITED, UNITED KINGDOM

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CLARK, MICHAEL R.;REEL/FRAME:012170/0897

Effective date: 20010802

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION