KR20110103465A - System and method for casting and rolling metal - Google Patents

Abstract

The present invention is directed to a device and method for casting and rolling substantially a metal, wherein at least one first and second casting line for casting the slab, as well as a rolling sequence for rolling the cast slab, The first casting line is a horizontal thin slab casting system 1 comprising at least one discharge vessel 5 for melt and a conveyor belt 6 extending horizontally behind the at least one discharge vessel 5 in the casting direction. The second casting line is likewise formed as a horizontal thin slab casting system 1 and / or to bend and straighten the vertically casted slab to a horizontal position as well as one or more molds 4 for vertically casting the slab. It is formed as a vertical thin slab casting system 2 comprising a bending and straightening device 7 for the purpose, and behind the two or more casting lines a cast slab Rolling rows 11 for softening are arranged, and the two or more casting lines are formed in such a manner that slabs each cast into one of the two or more casting lines can be supplied to the rolling rows 11. The present invention relates to a metal casting and rolling apparatus and method.

Description

SYSTEM AND METHOD FOR CASTING AND ROLLING METAL {SYSTEM AND METHOD FOR CASTING AND ROLLING METAL}

The present invention relates to an apparatus and method for casting and rolling metal, in particular steel, using a plurality of casting systems and rolling trains arranged behind them.

For clarity, several concepts are first used herein in the same sense within the scope of this specification. The concepts of "thin slab" and "slab" refer to the thinnest slab (thickness: 5 to 35 mm), the thin slab (thickness: 35 to 90 mm), and the medium thickness slab (thickness: 90 to 90 mm). 150 mm) or rough strip (thickness: 20-50 mm).

The concept of "horizontal thin slab casting system" is synonymous with horizontal strip casting systems, in particular BCT (belt casting technology) systems or DSC (direct strip casting) systems, within the scope of the present specification.

The concept of "vertical thin slab casting system" refers to a thin slab casting system, subsequent bending and straightening devices for strands, still comprising liquid craters, in the scope of the present specification, in particular in the sense of the following system type, namely "compact strip production." Vertical casting systems, vertical casting systems (eg CSP systems) including subsequent bending and straightening devices for fully solidified strands, or arc casting systems.

European publication EP 1 708 830 B1 shows a CSP system designed for the production of thin slabs with a thickness of about 50 mm. In this publication in particular a double stranded system is described. The plurality of strands produced in this system are fed in a common rolling sequence. In this regard, the transfer of the plurality of strands is accomplished by a so-called swivel table. In addition, a rolling system for a conventional thick slab or a medium thick slab is arranged in parallel, in front of which the double stand rough rolling line is arranged, which is introduced into the CSP line by the rough rolling line. Is reduced to a thickness of about 50 mm. When the slab is introduced into the CSP line, a rough rolling stand or a thin rolling stand is arranged in front.

In patent publication EP 1 318 876 B1, two CSP systems are provided, behind which a rolling sequence is arranged. One CSP system of the CSP system serves to manufacture carbon steel, and the other CSP system serves to manufacture special steel. Steel slabs are bent in the CSP systems.

SUMMARY OF THE INVENTION The technical object of the present invention is, in the known apparatus and known method for casting and rolling metals, starting from the prior art described above, which makes the apparatus suitable for producing not only high alloy steel or ultra high alloy steel, but also thin strips. And improving the method.

The technical object is that in an apparatus according to the invention for casting and rolling metal, one or more first and second casting lines for casting a slab, and slabs cast in the first casting line are referred to as a second casting line. Means for conveying, and a rolling train for rolling the cast slab, wherein the first casting line includes at least one discharge vessel for the melt and a conveyor belt extending horizontally behind the at least one discharge vessel in the casting direction. Is formed as a horizontal thin slab casting system, and the second casting line is likewise formed as a horizontal thin slab casting system, or bends and straightens to bend one or more molds for vertical casting of the slab, as well as to bend the vertical cast slab to a horizontal position. It is formed as a vertical thin slab casting system that includes a device and includes two main A rolling column for rolling the slab that is cast is arranged at the rear of one casting line of the jaw line, and the two or more casting lines and the conveying means are each of the slabs cast into one casting line of the two or more casting lines. It is achieved by the metal casting and rolling apparatus, which is formed in such a way that it can be fed into.

By means of the device according to the invention it can be configured such that the rolling train is further improved. In addition, the existing rolling sequence can also be configured to be further improved through expansion with additional casting lines. In addition, the provision of a horizontal thin slab casting system allows not only to produce high alloy steels or ultra-high alloy steels, but also to produce crack sensitive steels and steels containing particularly high aluminum contents, because the thin slabs are horizontal This is because the thin slab casting system does not come into contact with the cast powder by a movable mold or a conveyor belt. Likewise, in combination with a horizontal thin slab casting system, the microparticle structure is achieved by fast solidification and little segregation. In addition, traces of vibration on the cast product can be prevented by a movable mold. Unexpected cracking, bending or straightening damage is likewise prevented. In addition, standard steels can also be produced by additionally provided thin slab casting systems. In other words, the overall production program or product range is clearly expanded compared to known devices. In addition, by using the thin slab technology, a strip having a thickness of less than 15 mm can be produced directly, and as a result, the rolling cost in the rolling train is greatly reduced.

In a preferred embodiment of the apparatus each of the two or more casting lines is formed as a horizontal thin slab casting system, behind which are arranged a rolling sequence for rolling the slab cast in the horizontal thin slab casting system. This arrangement allows the device itself, including only horizontal thin slab casting systems, to be operated cost effectively.

In a further preferred embodiment of the apparatus two or more casting lines are formed to enable casting the slab with a thickness so thin that the cast slab does not require a rough rolling stand for rolling the slab before entry into the rolling train. do. This arrangement saves space, energy and cost.

In a further preferred embodiment of the apparatus a thin slab casting system for casting and rolling slabs having a thickness between 40 mm and 120 mm is formed and / or 5 mm and 35 mm (preferably 10 mm and 20 mm). A horizontal thin slab casting system is formed for casting and rolling slabs having a thickness between).

In a further preferred embodiment of the apparatus, one or more horizontal thin slab casting systems are formed for casting high alloy steels and ultraalloy steels.

In a further preferred embodiment of the apparatus, at least one temperature control device, in particular a furnace, is arranged behind the conveyor belt of the at least one thin slab casting system in the casting direction and / or of the at least one thin slab casting system in the casting direction. At the rear of the bending device is arranged at least one temperature control device, in particular a furnace.

In a further preferred embodiment of the device a means for conveying the slab cast in one of the two or more casting lines to the other casting line of the two or more casting lines is formed by a transverse conveying table, in particular a pivoting conveying table, And / or the horizontal transfer table is formed so that the transfer to the section of the temperature control device of the other casting line of the two or more casting lines.

In a further preferred embodiment of the apparatus two or more casting lines are arranged parallel and / or side by side with each other.

In a further preferred embodiment of the apparatus the apparatus comprises a total of three casting lines arranged side by side parallel to each other, the rear of the center casting line of the three casting lines in the casting direction for rolling the slab cast in the casting lines Rolling columns are arranged.

The invention also uses two or more casting lines for casting a slab, hereinafter also referred to as first and second casting lines, in particular using an apparatus according to any one of the claims of the claims. In a method for casting and rolling metal, the thin slab is horizontally cast in at least one casting line of the plurality of casting lines and the thin slab is horizontally cast in at least one further casting line, and / or the slab is vertically and / or The metal casting and rolling method also includes the arc casting, which is bent in the horizontal direction during or after casting, and subsequently the slab cast is precisely fed in a rolling sequence. The advantages of the method according to the invention correspond in large part to the advantages of the device according to the invention.

In a preferred embodiment with regard to the method, the horizontally cast thin slab is formed by steel containing up to 10% aluminum content.

In a further preferred embodiment of the method the horizontally cast thin slab is formed by steel containing an aluminum content between 1% and 3%.

In a further preferred embodiment of the method the horizontally cast thin slab is formed by carbon steel, low alloy steel, high alloy steel or peritectic steel.

In the following, the diagram of the embodiment is briefly described. Further details can be found in the detailed description of specifics of the examples.
1A is a schematic top view of an embodiment of a device according to the invention in which a horizontal thin slab casting system can be connected with a double strand thin slab casting system via a pivot transfer table.
FIG. 1B is a perspective view of the apparatus according to FIG. 1A but including a cavity tundish for a double strand vertical thin slab casting system.
FIG. 1C is a top view schematically illustrating an embodiment of the device according to the present invention similar to FIG. 1A but with a relatively shorter temperature control interval.
1d is a perspective view of the device according to FIG. 1c.
FIG. 2A is a schematic top view of an embodiment according to the invention comprising a thin slab casting system and a rolling sequence disposed behind it and two horizontal thin slab casting systems which can be connected with the systems via a pivot transfer table. It is also.
Figure 2b shows a perspective view of the device according to figure 2a;
3a schematically illustrates an embodiment according to the invention comprising a horizontal thin slab casting system and a rolling sequence disposed behind it and two horizontal thin slab casting systems which can be connected with the systems via a pivot transfer table. Top view.
3b shows a perspective view of the device according to FIG. 3a.
4a schematically illustrates an embodiment according to the invention of a three horizontal thin slab casting system in which a melt is fed through a cavity tundish and connected to each other via a pivoting transfer table, with the rolling rows of cavities arranged at the rear; Top view.
4b shows a perspective view of the device according to FIG. 4a.

1 a shows an embodiment according to the invention of an apparatus comprising two CSP systems 2 or a vertical thin slab casting system 2. The vertical thin slab casting system 2 is known. In this system 2 the strands are first vertically cast by the mold 4, then bent by the bending device 7 and finally corrected by the calibration unit. Optionally a cutting device 8 or shear 8 is provided in the casting direction. The slab then reaches the thermostat 9, in particular the furnace 9, arranged rearward. In this furnace the slab may for example be heated or kept at a predetermined temperature.

Next to the two CSP casting lines 2 is a horizontal thin slab casting system 1. This horizontal thin slab casting system is preferably located parallel to the side of one of the plurality of vertical thin slab casting systems 2. The system 1 shown at the top in FIG. 1 a includes not only a discharge vessel 5 for the melt, but also a conveyor belt 6 at which the liquid melt is guided at the top and the metal strip begins to solidify. The rear is then provided with a temperature control zone or device 9 in the case of FIG. 1A.

In addition, for the embodiment shown in FIG. 1, a pivot transfer table 10 is provided for transferring the slab from the ends of two outwardly located casting lines to a casting line disposed in the middle. The structure of the swing transfer table 10 is known to those skilled in the art. In the case of an alternative embodiment a parallel table as is generally known in accordance with the invention can also be provided. Optionally the temperature control region 9 can be formed as a roller hearth furnace, in particular the transverse feed table 10 is formed as a (tunnel) as a furnace table. The corresponding use of the transverse transfer table 10 allows the slab to be fed from each of the three systems 1, 2 to a rolling train 1 arranged behind it. In particular, as shown, the three casting lines or systems 1, 2 as a whole are arranged next to each other. The rolling column 11 is preferably located in line with the center casting line of the three casting lines. The slab thus produced from the outer lines can be conveyed by the transverse conveying table 10 to the section of the temperature control device 9 which is located in line with the rolling train 11. It may also be generally provided that the slab is introduced into the casting line on one side of the casting line from outside for one or more of the casting lines. In addition, an additional rough rolling stand may be provided in one of the casting lines so as to roll the introduced slab. The configuration of the rolling train 11, which is preferably arranged behind the plurality of casting systems 1, 2, including the plurality of roll stands 12, is not the main object of the present invention and is made in a known manner.

FIG. 1B shows the apparatus according to FIG. 1A, in which a plurality of molds 4 of a plurality of vertical thin slab cast-rolling systems 2 are fed melt by a common tundish 3.

By means of the apparatus according to FIGS. 1 a and 1b the advantages of the horizontal thin slab casting system 1 can be combined with the advantages of the vertical thin slab casting system 2. The rolling column 11 is excellently constructed because three casting lines supply strands to one rolling column 11. If the thin slab casting system 1 is provided independently, the investment in the rolling column 11 may be relatively high when measuring the output of the thin slab casting system 1. If the vertical thin slab casting system 2 is already in operation, this vertical thin slab casting system can be extended by the horizontal thin slab casting system 1 according to the invention, whereby the already existing rolling train 11 ) Economics and production range will be expanded.

1C and 1D show a similar inventive embodiment of the device as in FIGS. 1A and 1B. However, unlike the apparatus shown in FIGS. 1A and 1B, the horizontal thin slab casting system 1 (shown above in FIGS. 1B and 1C) is formed comprising a relatively shorter temperature control device 9. The systems can also be operated more economically even if they contain only a relatively short temperature control zone 9 for intermediate storage of thin slabs or ultra thin slabs. The remaining arrangement structure is the same as the arrangement structure shown in Figs. 1A and 1B.

FIG. 2A shows a vertical thin slab casting system 2 in which rolling rows 11 are arranged in a row at the rear. Next to the system are arranged horizontal thin slab casting systems 1 of the type already shown on both sides, as shown in FIGS. 1B and 1C. Similar to the embodiments described above, the slab spans the transverse transfer table 10 from the casting line or from two thin slab casting systems 1 located outwardly by the transverse transfer table 10, preferably at a respective temperature. From the end of the adjusting device 9, it can be conveyed or guided to the section of the temperature control region 9 of the center casting line or thin slab casting system 2. The section is preferably located in the middle region of the temperature control device 9 of the vertical thin slab casting system 2 when viewed in the casting direction. When the slab thus reaches this section from the outer casting lines, the slab preferably passes through part of the temperature control region 9 and is then fed to the rolling column 11.

FIG. 2B shows the same arrangement structure as FIG. 2A but is a perspective view. Reference numerals are interpreted similarly to those in Figs. 1A to 1D.

3a and 3b show a further embodiment of the device according to the invention in a top view and a perspective view, respectively. In the present embodiment, the three horizontal thin slab casting systems 1 are arranged side by side with each other, and in the rear of the thin slab casting system 1 disposed at the center of the three systems, the rolling rows 11 are arranged in a line or in a straight line. Is placed. Similar to the embodiments described above, a transverse transfer table system 10 is provided for transferring the slab from an outwardly located system to a centered system or casting line.

Figures 4a and 4b are considered as analogous to Figures 3a and 3b, but here all of the casting lines are fed with melt from the hollow tundish 3. This case may be referred to as a triple or multiple strand system for supplying strands to the rolling train 11.

In general, the features shown in all of the figures can be combined with each other, or the details of the individual structures can be adjusted appropriately for each application by one skilled in the art.

1: horizontal thin slab casting system
2: vertical thin slab casting system
3: turndish
4: mold
5: discharge container
6: conveyor belt
7: bending device / straightening device
8: cutting device
9: thermostat
10: pivoting table
11: rolling column
12: roll stand

Claims (13)

An apparatus for casting and rolling metal,
One or more first and second casting lines for casting the slab,
Means for transferring the slab cast in the first casting line to the second casting line,
A rolling train for rolling the cast slab
In the metal casting and rolling device,
The first casting line comprises a horizontal thin slab casting system comprising at least one discharge vessel 5 for the melt and a conveyor belt 6 extending horizontally behind the at least one discharge vessel 5 in the casting direction. Formed as (1);
The second casting line is likewise formed as a horizontal thin slab casting system 1, or bends for bending and straightening the vertically casted slab to a horizontal position, as well as one or more molds 4 for vertically casting the slab and It is formed as a vertical thin slab casting system 2 comprising a straightening device 7; And
The rolling column 11 for rolling the cast slab is disposed at the rear of one casting line of two casting lines, and the two or more casting lines and the conveying means are one casting line of two or more casting lines. Metal casting and rolling device, characterized in that formed to be supplied to each of the slab cast to the rolling train (11). A casting machine according to claim 1, wherein each of said at least two casting lines is formed as a horizontal thin slab casting system (1), behind said casting system for rolling said slab cast in said horizontal thin slab casting system (1). Metal casting and rolling device, characterized in that the rolling column (11) is arranged. The strip according to claim 1 or 2, wherein the two or more casting lines have a thickness such that no rough rolling stand for rolling the slab is required for casting the slab before entering the rolling train 11. Metal casting and rolling device, characterized in that formed in a manner capable of casting. The vertical thin slab casting system (2) according to any one of the preceding claims, wherein the vertical thin slab casting system (2) is formed to be able to cast slabs having a thickness between 40 mm and 120 mm, and / or the horizontal thin slab The casting system (1) is formed so as to be able to cast slabs having a thickness between 5 mm and 35 mm, preferably between 10 mm and 20 mm. 5. The metal casting and rolling device as claimed in claim 1, wherein the at least one horizontal thin slab casting system is formed for casting high alloy steels and ultra high alloy steels. 6. 6. The at least one temperature regulating device 9, in particular the furnace 9, according to claim 1, in the rear of the conveyor belt 6 of the at least one thin slab casting system 1. And / or at least one temperature control device 9, in particular a furnace 9, is arranged behind the bending and straightening device 7 of the at least one vertical thin slab casting system 2 in the casting direction. Characterized in that the metal casting and rolling device. The means according to any one of claims 1 to 6, wherein the means for transferring the slab cast in one casting line of the two or more casting lines to the other casting line of the two or more casting lines comprises a transverse transfer table (10). ), In particular by the pivot transfer table 10, and / or the transverse transfer table is formed in such a way that the transfer is carried out to the section of the temperature control device 9 of the other casting line of the two or more casting lines. Metal casting and rolling device, characterized in that. 8. The metal casting and rolling device as claimed in claim 1, wherein the two or more casting lines are arranged in parallel and / or side by side with each other. 9. 9. The rolling mill according to any one of claims 1 to 8, wherein the metal casting and rolling apparatus comprises a total of three casting lines arranged side by side in parallel with each other, and the rolling mill for rolling the slab cast in the plurality of casting lines. A column (11), characterized in that the metal casting and rolling device is arranged in the casting direction behind and / or in line with the middle of the three casting lines. In a method for casting and rolling metal using at least two casting lines for casting a slab, in particular using a metal casting and rolling device according to any one of claims 1 to 9,
Thin slabs are horizontally cast in one or more of the casting lines, thin slabs are horizontally cast in one or more additional casting lines, and / or slabs are vertically cast and bent in the horizontal direction, followed by the cast slab. Metal casting and rolling method, characterized in that which is supplied exactly in the rolling column (11). 11. The method of claim 10, wherein the horizontally cast thin slab is formed by steel containing up to 10% aluminum content. 12. The method of claim 10 or 11, wherein the horizontally cast thin slab is formed by steel containing aluminum content between 1% and 3%. 13. The method of any one of claims 10 to 12, wherein the horizontally cast thin slab is formed by carbon steel, low alloy steel, high alloy steel, or pore steel.

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