EP0401988A2 - Dispositif pour retenir et/ou verser pour cuves pour bains de métaux coulées - Google Patents

Dispositif pour retenir et/ou verser pour cuves pour bains de métaux coulées Download PDF

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Publication number
EP0401988A2
EP0401988A2 EP90305293A EP90305293A EP0401988A2 EP 0401988 A2 EP0401988 A2 EP 0401988A2 EP 90305293 A EP90305293 A EP 90305293A EP 90305293 A EP90305293 A EP 90305293A EP 0401988 A2 EP0401988 A2 EP 0401988A2
Authority
EP
European Patent Office
Prior art keywords
molten metal
outlet
means according
starting tube
protective ring
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.)
Granted
Application number
EP90305293A
Other languages
German (de)
English (en)
Other versions
EP0401988B1 (fr
EP0401988A3 (fr
Inventor
Heinrich Comes
Klaus-Dieter Friede
Hubert Krampe
Michael Jünnemann
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
Original Assignee
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
Application filed by Foseco International Ltd filed Critical Foseco International Ltd
Priority to AT90305293T priority Critical patent/ATE97598T1/de
Publication of EP0401988A2 publication Critical patent/EP0401988A2/fr
Publication of EP0401988A3 publication Critical patent/EP0401988A3/fr
Application granted granted Critical
Publication of EP0401988B1 publication Critical patent/EP0401988B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/002—Retaining slag during pouring molten metal by using floating means

Definitions

  • the invention relates to a means for retaining contaminations contained in a melting bath, i.e. containing molten metal, in a vessel, e.g. a tank, a ladle, a distribution means, a tundish and the like.
  • a melting bath i.e. containing molten metal
  • a vessel e.g. a tank, a ladle, a distribution means, a tundish and the like.
  • the invention particularly relates to a pouring means for tundishes for receiving molten metal (steel) and for passing it on into ingot moulds or into the mould of a continuous casting plant but is not limited thereto.
  • the steel is passed from a ladle into a tundish, which has outlets in the bottom corresponding to the positions of the moulds.
  • the tundish is either provided with slide gate nozzles from below or with plugs from above, or, in the case of free-runs, with outlet nozzles only.
  • the outlet areas are heated before use by means of burners, from below or from above, in order to avoid chilling during the start-up of casting.
  • the first portion of the steel reaching the tundish and distributing there up to the outlets, is coined by low temperatures and contaminations, which result e.g. from refractory particles from the lining, from sand and from the oxidation of the steel during the start-up of the casting.
  • dams built in for avoiding these problems, which dams were intended to effect a rise of the contaminations due to the damming up of the initial steel and which were also intended to raise the initial casting temperatures due to the high steel volume by mixing the subsequent hot steel with the initially cold steel.
  • This could not prevent the contaminations floating on the surface from reaching the outlets during the starting phase, thus leading, as already described, to a devaluation of the initial steel strand or to difficulties in the starting procedure of casting.
  • filters proposed for use in the outlet were not able to solve these problems due to blockings or difficulties in chilling.
  • starting tubes were used with sliding gate nozzles, independently from the damming and filtering above the outlets, which starting tubes with their cylindrical shape and with a diameter corresponding to the outlet sprue, caused a temporary bulkheading off of the outlet which, though raising the starting temperature, were incapable of preventing the contaminations floating on the surface, when reaching the top of the starting tube or the overflow openings provided in the starting tube, to be the first to enter the outlet.
  • the present invention is based on the problem of providing means of the initially mentioned kind in a manner as to ensure that the cast strand does not contain contaminations.
  • the gist of the invention is an annular buoyancy body in the form of a protective ring which is either conducted on the starting tube or the plug or, in the case of free-runs, on a suitable means in a manner that it prevents slag from reaching the outlet.
  • the protective ring serves as an inhibit member and projects with its upper part from the surface of the molten bath level to such an extent that no slag particles or the like can pass, across its upper rim, to the inner space of the protective ring.
  • the projection above the bath level can be achieved by selecting the shape of the protective ring and its specific weight in correspondence to the particles floating on the surface of the melting bath or of the melting bath itself, independently from the actual level of the bath.
  • the protective ring can also be fixed at a specific position with respect to the starting tube or its overflow openings. This can counteract the unwanted Vortex-effect, namely, the level in the tundish dropping on the occasion of an exchange of ladles.
  • the starting tube can also be provided with openings in its lower region too.
  • said openings are at first closed by pieces of sheet material so that at first they do not have any function when casting starts up. Under the action of the high temperatures of the melting bath these sheets are eventually melted so that now steel can flow through said openings into the outlet. In the normal melting procedure this actually is not necessary, since the overflow openings in the upper part of the starting tube meet this function. At the end of the sequence, however, these lower openings take over the function that the steel can flow out of the tundish so that only a small residue will result (so-called button).
  • a tundish 13 is provided with a lining 13A which can be replaced upon wear. Underneath said lining 13 there is a permanent lining 14 and an insulating lining 15. 16 refers to the casing of the tundish itself.
  • the tundish has an outlet or pouring opening 4 in its base and the entrance to the outlet is surrounded inside the tundish by a starting tube 1.
  • Starting tube 1 has openings 3 towards its upper end.
  • a protective ring 2 surrounds starting tube 1 and rests on the base of the tundish when the latter is empty.
  • the surface of the molten steel is covered with a slag layer 11 and a covering insulating layer 10 both of which represent a source of contaminating particles for the steel to be poured through outlet 4.
  • starting tube of Figure 1 is open-topped whereas in the embodiment shown in Figure 2, starting tube 1 has a lid 23 of greater diameter than tube 1 so that it projects beyond the tube at 21.
  • FIG 3 a tundish 24 having an outlet 4 in its base that is closed by a plug 6.
  • a protective ring 2 surrounds plug 6 and sits on the floor of the tundish when it is empty or just starting to fill with molten steel 12.
  • the operation of protective ring 2 is very similar to that used with the starting tube 1 of Figures 1 and 2. Indeed, for convenience, since the conditions relating to use of the present invention for the individual pouring means, namely with a sliding gate nozzle 17 or with a plug 6 or as free-run are rather similar, the invention is subsequently described and explained principally in connection with Figures 1 and 2.
  • Starting tube 1 as shown in Figure 1 has an inner diameter corresponding to the diameter of the outlet and is attached to the tundish base surrounding outlet 4 and fastened and sealed so that during the initial phase steel cannot reach outlet 4 directly and that tube 1 cannot float up.
  • Said tube 1 is open at the top and has slots 3 towards its upper end at a predetermined distance from the tundish base which slots are dimensioned such that the amount of steel that can flow through is larger than that corresponding to the predetermined diameter of the outlet.
  • a protective ring 2 the goemetrical shape and buoyancy of which is such that it floats up due to the buoyancy caused by the steel 12 and assumes a floating position partially submerged in the steel 12 and partly protruding above slag 11 and insulating layer 10.
  • tube 1 inhibits, as long as it remains in place, and even when ladles are exchanged, characterised by a drop in the steel level, the so-­called Vortex-effect, i.e. the drawing-in of slag into the outlet.
  • Vortex-effect i.e. the drawing-in of slag into the outlet.
  • tube 1 is designed in a manner that at the end of the sequence it will leave its position and float up or that it is mechanically forced to do so.
  • tube 1 may be designed in a manner that floating ring 2 is prevented from floating up further at the upper part of tube 1 during the casting procedure. This embodiment is shown in Figure 2.
  • the starting tube 1 is provided with overflow openings 3, which have a specific height and which are distributed over the circumference of starting tube 1.
  • Overflow openings 3 have a total surface which is adjusted to the inlet opening of outlet 4.
  • tube 1 is provided with a cover 23, which may be integral or a separate lid.
  • Numeral 21 designates a projection of cover 23 which prevents the floating protective ring from disengaging from starting tube 1 in the upward direction - as shown in dotted form at the right hand side.
  • a further opening is shown at 22, though a plurality of such openings can be provided distributed over the circumference of starting tube 1.
  • Said opening 22 is closed by the sheet element 22A so that these openings, at first, cannot perform any function.
  • steel can flow through opening 22. Since openings 22 are positioned rather far down the starting tube it can be achieved that the tundish empties to a very large extent at the end of the sequence.
  • the use of such starting tubes is of advantage since in the processes used so far, starting tube 1 was removed after the actual starting procedure. This gives rise to the danger that through pouring from the tundishes contaminations get into the casting strand.
  • the tube is also designed such that the pouring system can be preheated from below, which nowadays is a common measure. When doing so, care must be taken that the waste gases resulting from the burners can escape through slots 3 in the inner body, without problems occurring.
  • the heating of the pouring system thus is more intensive so that the heating period or the energy density of the burner can be reduced. There is no reason either why a common tundish should not be heated from above, as both systems - heating from below and heating from above - can work independently from each other. Due to the large heat reservoir after the heating it is possible to prolong the interruption period between heating and use of the tundish while equally good preheating is maintained.
  • the system can be used for applying, immediately after the heating and before the feeding of the steel to the tundish, the intended covering agents for insulation onto the tundish floor, since floating-up ring 2 around tube 1 prevents the corresponding slag or the still loose covering agent from flowing into the pouring system. This avoids the introduction of oxygen at the steel surface occurring hitherto and simultaneously reduces heat radiation and/or reduction in the steel casting temperature in the tundish during the first few minutes after the start.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Coating With Molten Metal (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP90305293A 1989-06-08 1990-05-16 Dispositif pour retenir et/ou verser pour cuves pour bains de métaux coulées Expired - Lifetime EP0401988B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90305293T ATE97598T1 (de) 1989-06-08 1990-05-16 Vorrichtung zur halterung und/oder zum ausgiessen fuer behaelter fuer metallschmelzbaeder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8907044U 1989-06-08
DE8907044U DE8907044U1 (de) 1989-06-08 1989-06-08 Rückhalte- bzw. Ausgußvorrichtung für Behälter für Metallschmelzen

Publications (3)

Publication Number Publication Date
EP0401988A2 true EP0401988A2 (fr) 1990-12-12
EP0401988A3 EP0401988A3 (fr) 1991-02-06
EP0401988B1 EP0401988B1 (fr) 1993-11-24

Family

ID=6839928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90305293A Expired - Lifetime EP0401988B1 (fr) 1989-06-08 1990-05-16 Dispositif pour retenir et/ou verser pour cuves pour bains de métaux coulées

Country Status (8)

Country Link
EP (1) EP0401988B1 (fr)
JP (1) JPH0371971A (fr)
AT (1) ATE97598T1 (fr)
CA (1) CA2018376A1 (fr)
DD (1) DD294890A5 (fr)
DE (2) DE8907044U1 (fr)
ES (1) ES2045806T3 (fr)
TR (1) TR27237A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002076658A1 (fr) * 2001-03-27 2002-10-03 Rhi Ag Dispositif pour empecher un effet vortex de se produire dans la zone d'evacuation d'une cuve de fusion metallurgique
RU2262414C2 (ru) * 2003-12-29 2005-10-20 Техком Импорт Экспорт Гмбх Промежуточный ковш для разливки стали
CN102398004A (zh) * 2011-11-29 2012-04-04 中冶南方工程技术有限公司 防止旋涡产生的滑动水口装置
CN107774913A (zh) * 2017-10-13 2018-03-09 共享装备股份有限公司 用于砂型的浇口盆及其制造方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8907044U1 (de) * 1989-06-08 1989-08-03 Foseco International Ltd., Birmingham Rückhalte- bzw. Ausgußvorrichtung für Behälter für Metallschmelzen
DE3922549A1 (de) * 1989-07-08 1991-01-10 Metacon Ag Vorrichtung zum schlackenfreien angiessen von stranggiessanlagen
GB2450896A (en) * 2007-07-10 2009-01-14 Anglo American Platinum Corp Separating apparatus and method for assaying
US9646831B2 (en) 2009-11-03 2017-05-09 The Trustees Of Columbia University In The City Of New York Advanced excimer laser annealing for thin films

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH517542A (de) * 1970-10-26 1972-01-15 Concast Ag Vorrichtung zum Abschluss einer Durchflussöffnung gegenüber Schlacke bei Giessgefässen
DE2316757C3 (de) * 1973-04-04 1978-08-03 Thermo-Industrie Gmbh & Co Kg, 3300 Braunschweig Gießpfanne für Stahl
DE2830811C2 (de) * 1978-07-13 1982-07-29 Eisen- und Stahlwerk Pleissner GmbH, 3420 Herzberg Verfahren und Vorrichtung zum Gießen von Formgußstücken
US4526349A (en) * 1983-12-13 1985-07-02 Schwer John W Method and article of manufacture for controlling slag carry-over during tapping of a heat in steelmaking
DE8907044U1 (de) * 1989-06-08 1989-08-03 Foseco International Ltd., Birmingham Rückhalte- bzw. Ausgußvorrichtung für Behälter für Metallschmelzen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002076658A1 (fr) * 2001-03-27 2002-10-03 Rhi Ag Dispositif pour empecher un effet vortex de se produire dans la zone d'evacuation d'une cuve de fusion metallurgique
RU2262414C2 (ru) * 2003-12-29 2005-10-20 Техком Импорт Экспорт Гмбх Промежуточный ковш для разливки стали
CN102398004A (zh) * 2011-11-29 2012-04-04 中冶南方工程技术有限公司 防止旋涡产生的滑动水口装置
CN107774913A (zh) * 2017-10-13 2018-03-09 共享装备股份有限公司 用于砂型的浇口盆及其制造方法

Also Published As

Publication number Publication date
DE69004742T2 (de) 1994-03-17
ATE97598T1 (de) 1993-12-15
EP0401988B1 (fr) 1993-11-24
CA2018376A1 (fr) 1990-12-08
EP0401988A3 (fr) 1991-02-06
DD294890A5 (de) 1991-10-17
JPH0371971A (ja) 1991-03-27
TR27237A (tr) 1994-12-20
ES2045806T3 (es) 1994-01-16
DE8907044U1 (de) 1989-08-03
DE69004742D1 (de) 1994-01-05

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