EP0447088A1 - Vergiessen von geschmolzenem Metall - Google Patents

Vergiessen von geschmolzenem Metall Download PDF

Info

Publication number: EP0447088A1
Authority: EP; European Patent Office
Prior art keywords: slab; insulating; tundish; molten metal; layer
Prior art date: 1990-03-13
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

EP91301774A

Other languages

English (en)

French (fr)

Other versions

EP0447088B1 (de

Inventor

Andre Hettler

Augustin Grillet

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.)

1990-03-13

Filing date

1991-03-04

Publication date

1991-09-18

1991-03-04 Application filed by Foseco International Ltd filed Critical Foseco International Ltd

1991-09-18 Publication of EP0447088A1 publication Critical patent/EP0447088A1/de

1994-05-18 Application granted granted Critical

1994-05-18 Publication of EP0447088B1 publication Critical patent/EP0447088B1/de

2011-03-04 Anticipated expiration legal-status Critical

Status 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal

Definitions

This invention relates to the pouring of molten metal from a ladle to another vessel, e.g. a mould. Frequently such pouring is via an intermediate vessel, e.g. a tundish, particularly in the continuous casting of molten metal such as steel.
an intermediate vessel e.g. a tundish
a covering layer to the molten metal in a vessel such as a tundish in order to provide insulation against excessive heat loss and also to react with the molten metal to remove unwanted inclusions, e.g. of alumina.
a vessel such as a tundish
rice husks are frequently used or other, for example, basic materials formulated for the particularly desired reaction.
Such covering layers have usually been applied in powder form but there have been proposals to apply a covering layer in sheet form. In principle this can be advantageous in reducing dust levels and in containing dangerous splashing of molten metal during the pouring operation.
the use of two refractory heat-insulating slabs is described in British Patent Specification No. 1571333.
the slabs are pivotally-mounted at an upper edge or in a wall portion of a tundish in spaced apart relationship and extending downward into the vessel.
the molten metal is poured between the slabs which can, therefore, contain any splash and, as pouring continues, the slabs rise on the molten metal until they are horizontal.
the slabs thereby provide a cover to reduce heat loss and to contain any powder additives.
Tundishes which may be generally rectangular in plan form, usually are frusto-conical in vertical transverse section with the walls sloping outwardly in the upwards direction.
One serious disadvantage of covering the molten metal by sheet material therefore, is that the sheet cannot cover the entire metal surface as the metal level rises and an increasing gap between sheet and tundish wall is unprotected.
the present invention provides an insulating slab for use as a covering layer for the molten metal in a molten metal handling vessel, e.g. a tundish, in which the slab comprises at least a layer of heat-insulating material which is shaped to have thickened portions extending along at least two opposite edges.
the invention provides a method of insulating the surface of molten metal in a handling vessel, e.g. a tundish, which comprises placing a covering layer in the form of a slab of heat-insulating material on the surface of the molten metal, in which the slab is shaped to have thickened portions extending along at least two opposite edges of the slab.
a handling vessel e.g. a tundish
the thickened portion of the insulating material layer will conveniently extend along the two sides of the slab that correspond to the outwardly sloping walls of the tundish.
the gap that would otherwise appear between slab and sidewall can be substantially filled with powdered material that has been formed by expansion and erosion of the thickened portions under the action of the hot metal.
composition of the insulating layer of the slab can be particularly formulated to expand and powder under the action of the heat of the molten metal.
the insulating layer may be formed from refractory fibres, e.g. calcium silicate or aluminosilicate; refractory filler, e.g. silica, alumina, magnesia or refractory silicates; and a binder, e.g. colloidal silica sol, sodium silicate, starch, phenol-formaldehyde resin or urea-formaldehyde resin.
Expandable materials e.g. expandable graphite, perlite or vermiculite may conveniently be included in order to give the desired expansion and powdering properties.
a second layer which can be a reactive flux layer of lesser insulating properties than the insulating layer, is attached to the underside of the insulating layer so that the slab can be chosen to optimise the insulation and reaction properties that are desired.
the second layer may be formed from any desired flux composition.
Such compositions are well known and may be based on various metallic oxides, e.g. mixtures of oxides of calcium, aluminium and magnesium, with other additives, e.g. carbon and calcium fluoride.
the thickened edge portions of the slab extend downwardly from the plane of the slab when considered in its horizontal position in a tundish.
two or more covering slabs of the invention in a tundish.
two slabs may be positioned in the empty tundish, one to each side of the entry zone.
a flat conventional slab 1 is made of fibre, filler and binder. In contact with molten steel the slab will expand and form powder, the powder and any residual slab forming a layer on top of the rising level of molten metal.
slab 2 has a thickened, depending edge 3. This edge is of frusto-conical or wedge shape. It too will expand and form powder under the action of contact with molten steel.
Figure 3 shows a slab 4 having a thickened depending edge 5 of different, parallelopiped shape.
Figure 4 shows the insulating slab 2 of Figure 2 with a reactive flux layer 6 attached to its underside.
a tundish 7 has upwardly and outwardly sloping sidewalls 8 and 9 and a base 10.
a slab 11 of the invention is placed in the tundish when empty and rests with its depending thickened edges 13 and 14 contacting the side walls 8 and 9 near to base 10.
Molten steel is then introduced into the tundish. It enters underneath slab 11, which then rises floating on the molten metal surface.
the filled tundish is shown in Figure 6.
the hot metal causes expansion and powdering of the slab.
the edges 13 and 14 have powdered to cover the gaps 15 and 16 that would otherwise have been left uncovered between the sidewalls and the slab.
the underside layer 17 of the slab has also started to react with the metal and, as shown, has to a degree insulated the upper layer 18 of the slab from the metal so that the slab has still retained some of its integrity.
tundish 19 has an outlet 20, closable by a stopper rod 21.
a slab 22 of the invention has a thickened edge 23 and an aperture 24 to accommodate the stopper rod.
the aperture 24 is also surrounded by a depending thickened portion 25 of the slab.

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Continuous Casting (AREA)
Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

EP19910301774 1990-03-13 1991-03-04 Vergiessen von geschmolzenem Metall Expired - Lifetime EP0447088B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
GB909005677A GB9005677D0 (en)	1990-03-13	1990-03-13	Pouring molten metal
GB9005677		1990-03-13

Publications (2)

Publication Number	Publication Date
EP0447088A1 true EP0447088A1 (de)	1991-09-18
EP0447088B1 EP0447088B1 (de)	1994-05-18

Family

ID=10672566

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19910301774 Expired - Lifetime EP0447088B1 (de)	1990-03-13	1991-03-04	Vergiessen von geschmolzenem Metall

Country Status (3)

Country	Link
EP (1)	EP0447088B1 (de)
DE (2)	DE69101999T2 (de)
GB (1)	GB9005677D0 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10105620A1 (de) *	2001-02-08	2002-09-12	Thyssenkrupp Stahl Ag	Verfahren und Abdeckplatte zur Erzeugung einer Schlackeschicht auf der Oberfläche einer Metallschmelze
DE102016112044B4 (de)	2016-06-30	2019-01-03	Refratechnik Holding Gmbh	Verwendung einer wärmedämmenden Platte zur Isolation von Metallschmelzen gegenüber der Atmosphäre oder einem metallurgischen Gefäß

Citations (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DD139220A1 (de) *	1978-10-06	1979-12-19	Eberhard Stuendel	Isolierplatte zur auskleidung von verteilergefaessen fuer geschmolzene metalle
DE2852011A1 (de) *	1978-12-01	1980-06-12	Contherm Ind Und Huettenbedarf	Zwischenbehaelter, insbesondere fuer eine stranggussanlage
GB1571333A (en) *	1977-03-28	1980-07-16	Foseco Trading Ag	Method of pouring molten metal
GB1586683A (en) *	1977-05-25	1981-03-25	Foseco Trading Ag	Method of locating a slab of refractory heat-insulating and/or exothermic material on a molten metal surface
WO1984003460A1 (fr) *	1983-03-08	1984-09-13	Ferrox Co Ets Int	Procede d'isolation thermique de la surface d'une masse d'acier fondue et panneau d'isolation thermique utilise comme plaque de recouvrement pour executer ledit procede
EP0239257A1 (de) *	1986-03-26	1987-09-30	Foseco International Limited	Reinigen von Stahl

1990
- 1990-03-13 GB GB909005677A patent/GB9005677D0/en active Pending
1991
- 1991-03-04 EP EP19910301774 patent/EP0447088B1/de not_active Expired - Lifetime
- 1991-03-04 DE DE1991601999 patent/DE69101999T2/de not_active Expired - Fee Related
- 1991-03-09 DE DE9102853U patent/DE9102853U1/de not_active Expired - Lifetime

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1571333A (en) *	1977-03-28	1980-07-16	Foseco Trading Ag	Method of pouring molten metal
GB1586683A (en) *	1977-05-25	1981-03-25	Foseco Trading Ag	Method of locating a slab of refractory heat-insulating and/or exothermic material on a molten metal surface
DD139220A1 (de) *	1978-10-06	1979-12-19	Eberhard Stuendel	Isolierplatte zur auskleidung von verteilergefaessen fuer geschmolzene metalle
DE2852011A1 (de) *	1978-12-01	1980-06-12	Contherm Ind Und Huettenbedarf	Zwischenbehaelter, insbesondere fuer eine stranggussanlage
WO1984003460A1 (fr) *	1983-03-08	1984-09-13	Ferrox Co Ets Int	Procede d'isolation thermique de la surface d'une masse d'acier fondue et panneau d'isolation thermique utilise comme plaque de recouvrement pour executer ledit procede
EP0239257A1 (de) *	1986-03-26	1987-09-30	Foseco International Limited	Reinigen von Stahl

Also Published As

Publication number	Publication date
DE69101999D1 (de)	1994-06-23
DE69101999T2 (de)	1994-09-15
EP0447088B1 (de)	1994-05-18
DE9102853U1 (de)	1991-06-13
GB9005677D0 (en)	1990-05-09

Legal Events

Date	Code	Title	Description
1991-08-02	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1991-09-18	AK	Designated contracting states	Kind code of ref document: A1 Designated state(s): BE DE FR GB
1991-10-09	17P	Request for examination filed	Effective date: 19910807
1993-08-25	17Q	First examination report despatched	Effective date: 19930707
1994-03-31	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1994-05-18	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): BE DE FR GB
1994-06-23	REF	Corresponds to:	Ref document number: 69101999 Country of ref document: DE Date of ref document: 19940623
1994-09-09	ET	Fr: translation filed
1995-03-23	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1995-03-23	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1995-05-10	26N	No opposition filed
1997-02-10	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 19970210 Year of fee payment: 7
1997-02-20	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 19970220 Year of fee payment: 7
1997-02-24	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 19970224 Year of fee payment: 7 Ref country code: BE Payment date: 19970224 Year of fee payment: 7
1998-03-04	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980304
1998-03-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19980331 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980331
1998-09-30	BERE	Be: lapsed	Owner name: FOSECO INTERNATIONAL LTD Effective date: 19980331
1998-10-28	GBPC	Gb: european patent ceased through non-payment of renewal fee	Effective date: 19980304
1998-12-01	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19981201
1998-12-31	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST

Publication	Publication Date	Title
US4177855A (en)	1979-12-11	Tundish and method of pouring molten metal therewith
US4042229A (en)	1977-08-16	Tundish with weirs
US4339115A (en)	1982-07-13	Heat insulating lining for metallurgical vessels
GB1469513A (en)	1977-04-06	Tundishes
CA1063769A (en)	1979-10-09	Tundish with weirs
US5348275A (en)	1994-09-20	Tundish nozzle assembly block
EP0076577B1 (de)	1986-05-07	Rinne für Metallschmelzen
EP0447088B1 (de)	1994-05-18	Vergiessen von geschmolzenem Metall
US4036282A (en)	1977-07-19	Process of ingot casting
EP0051910A1 (de)	1982-05-19	Gefäss für geschmolzenes Metall
EP0460823B1 (de)	1994-03-02	Feuerfeste Zusammensetzung
US3955721A (en)	1976-05-11	Expendable tundish liner
US4330107A (en)	1982-05-18	Teapot ladle and method of use
EP0119676B1 (de)	1987-04-29	Feuerfester Gegenstand zur thermischen Isolation
EP0140900B1 (de)	1988-05-11	Verfahren zur wärmeisolierung der oberfläche von geschmolzenem stahl
GB2253032A (en)	1992-08-26	Lining for a metallurgical vessel
CA1202463A (en)	1986-04-01	Refractory, heat-insulating slabs
GB1571333A (en)	1980-07-16	Method of pouring molten metal
CA1066479A (en)	1979-11-20	Casting of molten metals
EP0071363B1 (de)	1985-04-10	Syphonpfanne
GB2068515A (en)	1981-08-12	Porous Plugs in Metallurgical Vessels
CA1195472A (en)	1985-10-22	Metal casting and lined ladles therefor
US5318277A (en)	1994-06-07	Lined ladles, linings therefor, and method of forming the same
GB2131139A (en)	1984-06-13	Refractory heat-insulating slabs
CA1042625A (en)	1978-11-21	Tundish liners