WO1999024192A1 - Device for continuous casting of a metal bar - Google Patents

Device for continuous casting of a metal bar Download PDF

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Publication number
WO1999024192A1
WO1999024192A1 PCT/AT1998/000254 AT9800254W WO9924192A1 WO 1999024192 A1 WO1999024192 A1 WO 1999024192A1 AT 9800254 W AT9800254 W AT 9800254W WO 9924192 A1 WO9924192 A1 WO 9924192A1
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WO
WIPO (PCT)
Prior art keywords
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da
characterized
open
device according
Prior art date
Application number
PCT/AT1998/000254
Other languages
German (de)
French (fr)
Inventor
Josef LANSCHÜTZER
Klaus SCHÖNHUBER
Guo Xiu Shan
Heinrich THÖNE
Franz Wimmer
Original Assignee
Voest-Alpine Industrieanlagenbau Gmbh
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 AT189397A priority Critical patent/AT405914B/en
Priority to ATA1893/97 priority
Application filed by Voest-Alpine Industrieanlagenbau Gmbh filed Critical Voest-Alpine Industrieanlagenbau Gmbh
Publication of WO1999024192A1 publication Critical patent/WO1999024192A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408Moulds for casting thin slabs

Abstract

The invention concerns a device for the continuous casting of a metal bar with a strip thickness less than 60 mm for a casting speed ranging between 4 and 10 m/min using the open jet casting process. Said device comprises an oscillating open-ended mould (4), an inflow nozzle (4) and a receptacle containing the melting mass (3). The aim of the invention is to ensure a regular supply of the melting mass into an open-ended mould with a transverse cross-section substantially identical over its whole length. The open-ended mould (5) is in sealed contact with the inflow nozzle (4).

Description

Means for continuously continuously casting a metal strand

The invention relates to a device for the continuous continuous casting of a metal strip, preferably a steel strip with a strip thickness below 60 mm and at a casting speed 4-10 m / min after the Freistrahlgießverfahren, with an oscillating continuous chill mold, a penetrated by a through-channel inlet nozzle and a melt container.

In the continuous casting technology is continuously refined in continuous production ever thinner products takes place as a feedstock for further processing steps, which has reached with the launch of Dünnbrammengießanlagen a temporary peak appears, however, not complete. The reduction of the casting thickness provides large potential savings in capital and operating costs in the continuous casting downstream rolling mills. Currently, thin slabs are provided with a casting thickness of 60 to 70 mm, this herstellbar.Um but to achieve goal, it is necessary to extend the Eingießbereichereich ended mold funnel-shaped so as to provide clearance for the casting tube. However, these spatially limited expansion causes problems during withdrawal of the forming in this area thin and delicate strand shell. The bending stresses occurring due to the deflections of the strand shell can cause permanent damage to the continuously cast product lead (EP-B 149 734, EP-B 230 886).

Casting tubes of refractory material, such as are commonly used for the introduction of melt into a continuous casting mold, because of the thermal stress and the refractory material own material properties are not dimensioned so that they can also be introduced at very low casting thicknesses in the continuous casting mold, without that in this area an extension must be provided. The so-called "Freistrahlgießverfahren" offers an opportunity to bring the melt into the mold without having to use a projecting into the continuous casting mold casting tube. When Freistrahlgießverfahren, as described for example in US A 3,840,062, melt from a distributor vessel through outlets which can also be designed as a nozzle, is introduced in free fall into the mold and immersed therein into the meniscus. in order to avoid reoxidation of the melt, the casting jet against the influence of atmospheric oxygen by a corresponding envelope is protected, said closed space with is rinsed a protective gas. a significant advantage of the free-jet casting in connection with the casting of metal strip, especially steel strip, is to be seen in that it can be successfully counteracted at very low casting thicknesses of unwanted bridging.

The invention aims at avoiding disadvantages and problems of conventional devices and has as its object to provide after Freistrahlgießverfahren, means for the continuous casting of metal strip having a casting thickness of less than 60 mm with a uniform supply of molten metal in a direct chill casting mold having a substantially constant mold cross over the mold is possible at a high casting speed and a continuously cast strip with high surface and internal quality can be produced.

This object is inventively achieved in that the open-ended mold adjoins sealingly to the inlet nozzle.

Advantageously, the inlet nozzle to a passage channel for the melt, whose outlet cross-section is substantially centrally located and from the edges of the open-ended mold with Eintrittsöffhung distance in projection on the Eintrittsöffhung the open-ended mold. Here, it is desirable that the shape of the outlet cross-section of the passage channel, the cross-sectional shape of the open-ended mold Eintrittsöffhung corresponds.

According to a further variant of the invention, the inlet nozzle has at least two passage channels for the melt, whose outlet cross-sections are arranged from the edges of the open-ended mold Eintrittsöffhung spaced evenly distributed in projection on the Eintrittsöffhung the open-ended mold and substantially. It is expedient, that the passage channels are formed in the inlet duct of slots. These slots have substantially rectangular cross-section, wherein in the cast thickness of 30 mm with a cross section of the outlet openings of 8 mm x 150 - 10 m / min is fed - 300 mm is sufficient for the high melt casting speed of the fourth A further embodiment is that the outlet openings in the inlet duct having a circular or an elliptical cross section.

According to a preferred embodiment, the melting vessel and the inlet nozzle form an assembly that is connected to a displacement drive. In order for this module can be brought into a favorable position for its preheating.

Studies have shown that freezing the inlet nozzle is not expected during the ongoing casting operation. To bring the inlet nozzle to the operating temperature and to keep under varying operating conditions to operating temperature, for example at Gießunterbrechungen, has the inlet nozzle advantageously has a heating device, in particular an inductive heating on.

Another embodiment of the Erfiindung is characterized in that the input side a Kokillenisolierstein is inserted into the open-ended mold, which is connected sealingly to the inlet nozzle. With this Kokillenisolierstein a thermal insulation of the upper end of the copper plates with respect to the inlet nozzle is performed. The free passage cross-section of the Kokillenisoliersteines aligned with the cross-section of the Eintrittsöffhung ended mold, which is formed by copper plates. The Kokillenisolierstein consists of refractory material. In a free jet space within the open-ended mold, preferably by the Kokillenisolierstein, a protective gas conduit is guided, which connects the free space beam with a protective gas source. By flushing the free jet with room for example argon an access of oxygen in this space is excluded.

The flow quantity in the intake nozzle is particularly favorable when using the adjustable Freistrahlgießverfahrens when a pressure regulating valve is connected into the protective-gas line which is connected with control technology of the closure device.

A further advantageous embodiment of the invention is that the open-ended mold has on the input side in the area of ​​the free jet space above the meniscus access for Gießöl. Gießöl as a lubricant is particularly suitable for Freistrahlguß, does not require a largely peaceful meniscus and is therefore at particularly high casting speeds and more restless meniscus ideal formation of the strand shell safely support.

An advantageous embodiment is achieved in that the open-ended mold having a length of at least 900 mm, preferably at least 1200 mm. Duζch the long-ended mold a sufficient strand shell formation and strength of the strand for the subsequent supporting and driving roll stands is ensured.

With an embodiment of the open-ended mold as a curved mold to reduce the overall height can be achieved.

The invention is explained in more detail below with reference to the drawings, in which Fig. 1 is a schematic representation illustrating a device for the continuous continuous casting of a steel strip in a longitudinal section and Fig. 2, the core means consisting of open-ended mold, the inlet nozzle and and melting vessel in an enlarged representation in a possible embodiment , Fig. 3 shows a possible embodiment of the arrangement of the through passages of the inlet nozzle relative to the Eintrittsöffhung ended mold in a plan view of the open-ended mold. Fig. 4 shows another embodiment of the melt container in a plan view.

The bow-type schematically illustrated in Fig. 1 is suitable for casting a steel strip with a strip thickness less than 60 mm, the preferred tape thickness is in a range of 10 to 40 mm, as well as for casting with high casting speeds 4-10 m / min wherein the preferred range of the casting speed 4-7 m / min. It consists of a distribution vessel 1 from which the molten steel through a pouring tube 2 is supplied to a melting tank 3, which in turn has a Schmelzenauslaß, which is designed as the inlet nozzle 4 for the controlled transfer of the molten steel in the downstream-ended mold. 5 The open-ended mold 5 corresponds to a conventional continuous casting mold, wherein the molten steel-receiving and defining the cross section of the cast strand mold cavity is delimited by water-cooled copper plates. 6 The oscillation is conventional and therefore not shown. The optimal length of the open-ended mold is at least 900 mm at casting speeds and this is preferably in a range of 1200mm to 1400mm. On the output side connects to the open-ended mold 5 to a strand guide 7 formed of two rows of support rollers, subsequent to a driving-roller stand 8 for the controlled withdrawal of the cast strand. 9 The Bogengießanlage schematically shown has an overall height of about 3 m in a machine radius of 2500 mm.

The melt container 3 is divided by a dam 10, which is shown in Fig. 1 in a first embodiment in two Aufhahmebecken for melt, in a feed tank 11 and a flow basin 12. By the dam 10, a killed overflow of the melt is ensured in the gutter 12th In the whole melt container, the melt by a protective slag layer 13 is covered.

In FIG. 4 is a variant of the melting tank 3 is illustrated, also takes place in this variant by a dam 10 a separation into a feed tank 11 and a flow basin 12. The melt passing through the pouring tube 2 in the feed tank 11, then passes through below the melt surface are arranged passages 24 into the gutter 12 and from there through the passageway 16 in the unillustrated ended mold 5. As a result, it is possible to cover the melt with mold powder selectively controlling in the feed tank 11 and to prevent the entry of the mold powder and other foreign matter in the open-ended mold. 5 The melting vessel in such a fulfills its function as Einschlußabscheider particular degree even with a clean steel production route at the appropriate pretreatment of the molten steel.

The melting vessel 3 and the inlet nozzle 4 are formed jointly raised and lowered, as indicated by arrow 25 in FIG. 1. For preheating of the melting vessel 3 and the inlet nozzle 4, this assembly is lifted by means of a not shown displacement drive of the open-ended mold 5 and optionally also pivoted and placed onto the sealing-ended mold 5 until immediately before the sprue.

FIG. 2 is located in the gutter 12 of the melting tank 3 a Schmelzenauslaß, in which an inlet nozzle 4 is inserted, the extent corresponds in its cross-sectional size to the cross-sectional format of the downstream-ended mold 5 that the Eintrittsöffhung 18 of the open-ended mold 5 is covered by the inlet nozzle 4 and the inlet nozzle 4 rests on the open-ended mold. 5 , an integrated into the open-ended mold 5 Kokillenisolierstein 14, which is formed of insulating strips made of refractory material constitutes a thermal insulation between the intake nozzle 4 and the water-cooled copper plates. 6 A gas-tight connection between the inlet nozzle 4 and the open-ended mold 5 and the Kokillenisolierstein 14 achieved by a thin layer of ceramic insulating material. The melt container 3 and the bellmouth 4 oscillate together .with the open-ended mold. 5

The bellmouth 4 is traversed by passageways 16 which are formed in the region of the outlet openings 15 of rectangular slots 17th However, outlet openings of circular or elliptical cross-section are possible. The outlet openings 15 of the inlet nozzle 4 are uniformly distributed in relation to the Eintrittsöffhung 18 of the open-ended mold 5 and spaced from the edges of the Eintrittsöffhung 18 of the open-ended mold with distance. The Eintrittsöffhung 18 of the open-ended mold 5 is shown in Fig. 3 by dashed lines.

The melt in the form of a pouring stream into the free jet space 19 forms above the meniscus 20 in the open-ended mold occurs, as shown in FIG. 2 clearly, from the inlet nozzle 4, and is immersed in the meniscus 20 in free fall. The Kokillenisolierstein 14 is penetrated by an inert gas line 23 which opens into the free jet space 19, and this with a protective gas, such. B. argon supplied. Furthermore, are located in the region of the free space beam approaches 21 for Gießöl.

The bellmouth 4 is annularly surrounded by a heater 22, which is constructed as inductive heating. But other heating systems are conceivable. In particular for the heating phase before the start of casting, the use of a gas burner is economical.

The bellmouth 4 is associated with a closure device 26 which is formed in Fig. 1 by a liftable and lowerable stopper. However, the closure means may also, for. For example, be formed from an integrated inlet nozzle in the slide. The flow rate can be varied by varying the flow cross-section. Further, it is possible to flow rate control by adjusting the height of the bath in the melting vessel 3 and coupled to hood controller to set up. In addition, it is possible to regulate the flow in the inlet nozzle 4 on the revision of the gas pressure in the free jet space 19th For this purpose, in the inert gas line 23, a pressure regulating valve 27 is connected, which is connected with the control technology shutter 26th

Claims

Patentanspr├╝che:
1. A device for continuously Stranggießen a metal strip, preferably a steel strip with a strip thickness below 60 mm and at a Gießgeschwindigkeit 4-10 m / min after the Freistrahlgießverfahren, with an oscillating continuous chill mold (5), one from a passage channel (16) traversed Einlaufdüse (4) and a Schmelzenbehälter (3), characterized in that the open-ended mold (5) daß sealingly against the Einlaufdüse (4) anschließt.
2. Device according to claim 1, characterized in that the daß Einlaufdüse (4) a passage channel (16) für the melt has whose outlet cross-section in projection onto the Eintrittsöffhung (18) of the open-ended mold ( 5) is disposed substantially centrally and (from the Rändern Eintrittsöffhung 18) of the open-ended mold (5) at a distance ..
3. A device according to claim 2, characterized in that daß the shape of the exit cross-section of the passage channel (16) of the cross-sectional shape of the Eintrittsöffhung (18) of the open-ended mold (5).
4. A device according to claim 1, characterized in that the daß Einlaufdüse (4) at least two Durchtrittskanäle (16) für having the melt whose outlet cross-sections in projection on the Eintrittsöffhung (18) the open-ended mold (5) is substantially gleichmäßig and distributed by the Rändern the Eintrittsöffhung (18) of the open-ended mold (5) are spaced apart.
5. A device according to claim 4, characterized in that the Durchtrittskanäle (16) in the daß Einlaufdüse (4) of slits (17) are formed.
6. A device according to claim 4, characterized in that daß have a kreisförmigen or an elliptical cross-section, the Durchtrittskanäle (16) in the Einlaufdüse (4).
/. J-.innc-.tung according to one of Ansprüche 1 to 6, characterized in that the Schmelzengefäß (3) and the Einlaufdüse daß (4) form an assembly and this assembly with a displacement drive is connected.
8. The device according to one of Ansprüche 1 to 7, characterized in that the Einlaufdüse daß (4) a heating device (22), in particular an inductive heating, comprising.
9. The device according to one of Ansprüche 1 to 8, characterized in that daß in the open-ended mold (5) Kokillenisolierstein (14) is inserted on the input side, the anschließt sealingly against the Einlaufdüse (4).
10. The device according to claim 9, characterized in that the free passage cross-section of the Kokillenisoliersteines daß (14) to the cross section of the Eintrittsöffhung (18) of the open-ended mold in alignment, which is formed by copper plates.
11. The device according to one of Ansprüche 9 and 10, characterized in that the daß Kokillenisolierstein (14) made of refractory material.
12. The device according to one of Ansprüche 1 to 11, characterized in that daß in a free radiation space (19) within the open-ended mold (5), preferably by the geführt Kokillenisolierstein (14), a protective gas conduit (23) is that connects the free jet space (19) with a protective gas source.
13. The device according to claim 12, characterized in that daß in the protective gas conduit (23) a pressure control valve (27) is connected, which is connected with the control technology Verschlußeinrichtung (26).
14. Device according to one of Anspr├╝che 1 to 13, characterized in that the da├ƒ ended mold (5) on the input side in the area of ​​the free jet space (19) above the Gie├ƒspiegels (20) Zug├ñnge (21) f├╝ r has Gie├ƒ├╢l.
15. Device according to one of the Ansprüche 1 to 14, characterized in that the Durchlauflcokille (5) daß a Länge of at least 900 mm. comprises preferably at least 1200 mm.
16. Device according to one of the Ansprüche 1 to 15, characterized in that the daß Durchkaufkokille (5) is formed as a curved mold.
PCT/AT1998/000254 1997-11-07 1998-10-21 Device for continuous casting of a metal bar WO1999024192A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT189397A AT405914B (en) 1997-11-07 1997-11-07 Means for continuous continuous casting of a metal strip
ATA1893/97 1997-11-07

Publications (1)

Publication Number Publication Date
WO1999024192A1 true WO1999024192A1 (en) 1999-05-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6957220B2 (en) 2000-11-07 2005-10-18 Research Investment Networks, Inc. System, method and article of manufacture for tracking and supporting the distribution of content electronically

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014119109B4 (en) * 2014-12-18 2018-12-13 Voestalpine Stahl Gmbh Distributor for continuous casting plants

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468177A (en) * 1936-10-27 1937-06-30 American Smelting Refining Improvements relating to casting metal
FR1161668A (en) * 1956-11-21 1958-09-03 Electro Chimie Soc D improved device ensuring the regulation of the level of metal in the vertical continuous casting molds
US3304585A (en) * 1964-06-18 1967-02-21 Ascast Corp Graphite continuous casting mold
GB1227312A (en) * 1967-02-06 1971-04-07
DE2240795A1 (en) * 1971-09-30 1973-04-19 Noranda Mines Ltd Method and apparatus for continuously casting metal strip
US3840062A (en) * 1968-07-18 1974-10-08 M Kenney Continuous steel casting method
DE3340844C1 (en) * 1983-11-11 1984-12-20 Mannesmann Ag Continuous casting mold with cooling device for casting of metal, in particular steel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232046A (en) * 1990-01-22 1993-08-03 Mesta International Strand casting apparatus and method
DE4006842A1 (en) * 1990-03-05 1991-09-12 Schloemann Siemag Ag Strip casting assembly - has die head with flow guides to prevent turbulence in molten metal passing to the mouthpiece

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468177A (en) * 1936-10-27 1937-06-30 American Smelting Refining Improvements relating to casting metal
FR1161668A (en) * 1956-11-21 1958-09-03 Electro Chimie Soc D improved device ensuring the regulation of the level of metal in the vertical continuous casting molds
US3304585A (en) * 1964-06-18 1967-02-21 Ascast Corp Graphite continuous casting mold
GB1227312A (en) * 1967-02-06 1971-04-07
US3840062A (en) * 1968-07-18 1974-10-08 M Kenney Continuous steel casting method
DE2240795A1 (en) * 1971-09-30 1973-04-19 Noranda Mines Ltd Method and apparatus for continuously casting metal strip
DE3340844C1 (en) * 1983-11-11 1984-12-20 Mannesmann Ag Continuous casting mold with cooling device for casting of metal, in particular steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6957220B2 (en) 2000-11-07 2005-10-18 Research Investment Networks, Inc. System, method and article of manufacture for tracking and supporting the distribution of content electronically

Also Published As

Publication number Publication date
ATA189397A (en) 1999-05-15
AT405914B (en) 1999-12-27

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