WO2000050190A1 - Tundish impact pad - Google Patents
Tundish impact pad Download PDFInfo
- Publication number
- WO2000050190A1 WO2000050190A1 PCT/GB2000/000518 GB0000518W WO0050190A1 WO 2000050190 A1 WO2000050190 A1 WO 2000050190A1 GB 0000518 W GB0000518 W GB 0000518W WO 0050190 A1 WO0050190 A1 WO 0050190A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tundish
- sidewall
- impact pad
- impact
- gas
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
-
- 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
- B22D41/003—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with impact pads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
Definitions
- This invention relates to the handling of molten metal, especially steel.
- 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.
- WO 96/14951 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.
- United States Patent 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.
- United States Patent 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.
- a gas distribution chamber In the bottom of the tundish there is a gas distribution 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.
- 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.
- 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.
- the invention provides a kit of parts for assembly to form a tundish impact pad, comprising:
- 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.
- 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.
- 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.
- an inert gas e.g. argon or nitrogen
- 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.
- 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.
- 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.
- 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.
- 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.
- 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).
- 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.
- the ledge is preferably substantially parallel to the planar region of the impact surface.
- 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.
- 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.
- the ledge may comprise upper and lower porous portions and a substantially non-porous intermediate portion.
- 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.
- the second aspect of the invention is a kit of parts for assembly to form a tundish impact pad.
- the sidewall includes an inwardly projecting ledge.
- 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.
- 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.
- the sidewall preferably includes at least one gas supply conduit extending through the entire length thereof (e.g. an endless conduit).
- the tundish preferably includes one or more gas supply conduits for supplying the gas to the impact pad.
- 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.
- 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.
- 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.
- Figure 1 is a schematic illustration in cross section of a one-piece impact pad according to the invention
- Figure 2 is a schematic illustration in cross section of a two-piece impact pad according to the invention
- Figure 3 is a schematic illustration in cross section of a three piece impact pad according to the invention.
- Figure 4 is a schematic illustration in cross section of a tundish containing an impact pad according to the invention.
- Figure 1 shows in cross-section a one-piece tundish impact pad 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.
- 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.
- Figure 2 shows an impact pad similar to that shown in Figure 1 , with a porous upper portion 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.
- Figure 3 shows an impact pad similar to those shown in figures 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 17, a lower sidewall part 19, and an upper sidewall part 15 (which is the same as that of Figure 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.
- FIG. 4 shows, schematically and in cross-section, a tundish 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SK1201-2001A SK12012001A3 (en) | 1999-02-22 | 2000-02-17 | Tundish impact pad |
KR1020017010077A KR20010102015A (en) | 1999-02-22 | 2000-02-17 | Tundish impact pad |
AU25595/00A AU2559500A (en) | 1999-02-22 | 2000-02-17 | Tundish impact pad |
EP00903838A EP1154871A1 (en) | 1999-02-22 | 2000-02-17 | Tundish impact pad |
BR0008398-4A BR0008398A (en) | 1999-02-22 | 2000-02-17 | Shock absorber for distributor, distributor to contain molten metal, assembly of parts for assembly to form a shock absorber for distributor and process of removing inclusions of molten metal in a distributor |
CA002363120A CA2363120A1 (en) | 1999-02-22 | 2000-02-17 | Tundish impact pad |
PL00349362A PL349362A1 (en) | 1999-02-22 | 2000-02-17 | Tundish impact pad |
US09/917,797 US20020011696A1 (en) | 1999-02-22 | 2001-07-31 | Tundish impact pad |
BG105834A BG105834A (en) | 1999-02-22 | 2001-08-22 | Tundish impact pad for molten metal |
Applications Claiming Priority (2)
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 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/917,797 Continuation US20020011696A1 (en) | 1999-02-22 | 2001-07-31 | Tundish impact pad |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000050190A1 true WO2000050190A1 (en) | 2000-08-31 |
Family
ID=10848189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/000518 WO2000050190A1 (en) | 1999-02-22 | 2000-02-17 | Tundish impact pad |
Country Status (16)
Country | Link |
---|---|
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) | HUP0200132A2 (en) |
PL (1) | PL349362A1 (en) |
SK (1) | SK12012001A3 (en) |
TR (1) | TR200102438T2 (en) |
WO (1) | WO2000050190A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013190799A1 (en) * | 2012-06-18 | 2013-12-27 | Jfeスチール株式会社 | Method for manufacturing high-purity steel casting, and tundish |
WO2018024495A1 (en) | 2016-08-02 | 2018-02-08 | Thyssenkrupp Steel Europe Ag | Impact absorber, device for casting a metallic melt, and method for casting a metallic melt |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100530102B1 (en) * | 2001-11-24 | 2005-11-22 | 주식회사 포스코 | Molten steel flow distributing pad for the continuous casting tundish |
ZA200206261B (en) * | 2002-03-28 | 2003-04-07 | Foseco Int | Metallurgical impact pad. |
DE10235867B3 (en) * | 2002-08-05 | 2004-04-08 | Refractory Intellectual Property Gmbh & Co.Kg | Refractory ceramic component |
ITMI20031356A1 (en) * | 2003-07-02 | 2005-01-03 | Danieli Off Mecc | CRYSTALLIZER MOLTENING METAL FEEDER. |
US7865851B2 (en) * | 2006-03-06 | 2011-01-04 | Mentor Graphics Corporation | Capacitance extraction of intergrated circuits with floating fill |
US8066935B2 (en) | 2007-12-14 | 2011-11-29 | The Harrison Steel Castings Company | Turbulence inhibiting impact well for submerged shroud or sprue poured castings |
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 |
PL2865464T3 (en) * | 2013-10-22 | 2016-08-31 | Refractory Intellectual Property Gmbh & Co Kg | Fireproof ceramic impact pad |
JP6317478B2 (en) * | 2015-08-17 | 2018-04-25 | 日新製鋼株式会社 | Annular weir |
SK892016A3 (en) * | 2016-10-10 | 2018-07-02 | I.P.C. Refractories, Spol. S R.O. | Method of casting molten metal with the use of an impact pad in the tundish |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4468012A (en) * | 1981-11-13 | 1984-08-28 | Daussan Et Compagnie | Device for the removal of inclusions contained in molten metals |
GB2147837A (en) * | 1983-10-06 | 1985-05-22 | Rand Steel Tech | Gas distributing tundish barrier |
GB2164281A (en) * | 1984-09-18 | 1986-03-19 | Dresser Ind | Tundish with gas injection tile |
US5054749A (en) * | 1989-06-16 | 1991-10-08 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Tundish for continuous casting of steel |
EP0558018A1 (en) * | 1992-02-26 | 1993-09-01 | Veitsch-Radex Aktiengesellschaft Für Feuerfeste Erzeugnisse | Refractory ceramic prefabricated element for mounting in a tundish |
EP0576212A2 (en) * | 1992-06-18 | 1993-12-29 | Foseco International Limited | Purifying molten metal |
WO1996014951A1 (en) * | 1994-11-09 | 1996-05-23 | Foseco International Limited | Tundish impact pad |
-
1999
- 1999-02-22 GB GBGB9903937.2A patent/GB9903937D0/en not_active Ceased
-
2000
- 2000-02-17 SK SK1201-2001A patent/SK12012001A3/en unknown
- 2000-02-17 PL PL00349362A patent/PL349362A1/en unknown
- 2000-02-17 CZ CZ20013032A patent/CZ20013032A3/en unknown
- 2000-02-17 EP EP00903838A patent/EP1154871A1/en not_active Ceased
- 2000-02-17 AU AU25595/00A patent/AU2559500A/en not_active Abandoned
- 2000-02-17 CA CA002363120A patent/CA2363120A1/en not_active Abandoned
- 2000-02-17 HU HU0200132A patent/HUP0200132A2/en unknown
- 2000-02-17 KR KR1020017010077A patent/KR20010102015A/en not_active Application Discontinuation
- 2000-02-17 TR TR2001/02438T patent/TR200102438T2/en unknown
- 2000-02-17 CN CN00804159A patent/CN1341047A/en active Pending
- 2000-02-17 WO PCT/GB2000/000518 patent/WO2000050190A1/en not_active Application Discontinuation
- 2000-02-17 BR BR0008398-4A patent/BR0008398A/en not_active Application Discontinuation
- 2000-02-21 AR ARP000100721A patent/AR022638A1/en unknown
-
2001
- 2001-07-31 US US09/917,797 patent/US20020011696A1/en not_active Abandoned
- 2001-08-22 BG BG105834A patent/BG105834A/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4468012A (en) * | 1981-11-13 | 1984-08-28 | Daussan Et Compagnie | Device for the removal of inclusions contained in molten metals |
GB2147837A (en) * | 1983-10-06 | 1985-05-22 | Rand Steel Tech | Gas distributing tundish barrier |
GB2164281A (en) * | 1984-09-18 | 1986-03-19 | Dresser Ind | Tundish with gas injection tile |
US5054749A (en) * | 1989-06-16 | 1991-10-08 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Tundish for continuous casting of steel |
EP0558018A1 (en) * | 1992-02-26 | 1993-09-01 | Veitsch-Radex Aktiengesellschaft Für Feuerfeste Erzeugnisse | Refractory ceramic prefabricated element for mounting in a tundish |
EP0576212A2 (en) * | 1992-06-18 | 1993-12-29 | Foseco International Limited | Purifying molten metal |
WO1996014951A1 (en) * | 1994-11-09 | 1996-05-23 | Foseco International Limited | Tundish impact pad |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013190799A1 (en) * | 2012-06-18 | 2013-12-27 | Jfeスチール株式会社 | Method for manufacturing high-purity steel casting, and tundish |
WO2018024495A1 (en) | 2016-08-02 | 2018-02-08 | Thyssenkrupp Steel Europe Ag | Impact absorber, device for casting a metallic melt, and method for casting a metallic melt |
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 |
Also Published As
Publication number | Publication date |
---|---|
KR20010102015A (en) | 2001-11-15 |
AU2559500A (en) | 2000-09-14 |
HUP0200132A2 (en) | 2002-05-29 |
US20020011696A1 (en) | 2002-01-31 |
BR0008398A (en) | 2002-01-29 |
PL349362A1 (en) | 2002-07-15 |
EP1154871A1 (en) | 2001-11-21 |
CZ20013032A3 (en) | 2002-05-15 |
TR200102438T2 (en) | 2002-01-21 |
BG105834A (en) | 2002-04-30 |
AR022638A1 (en) | 2002-09-04 |
SK12012001A3 (en) | 2002-03-05 |
CA2363120A1 (en) | 2000-08-31 |
CN1341047A (en) | 2002-03-20 |
GB9903937D0 (en) | 1999-04-14 |
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