WO2011061262A1

WO2011061262A1 - System and method for casting and rolling metal

Info

Publication number: WO2011061262A1
Application number: PCT/EP2010/067771
Authority: WO
Inventors: Jörg BAUSCH; Lothar Fischer
Original assignee: Sms Siemag Ag
Priority date: 2009-11-21
Filing date: 2010-11-18
Publication date: 2011-05-26
Also published as: US20120006502A1; JP2012518541A; RU2461442C1; TW201127509A; MX2011011319A; UA102591C2; EP2501506A1; KR20110103465A; DE102010050647A1; CA2753152A1; AR080066A1; CN102341198A; AU2010320921A1

Abstract

The invention essentially relates to a device and a method for casting and rolling metal, wherein at least one first and one second casting line for casting slabs and a rolling train for rolling the casted slabs are provided. The first casting line is designed as a horizontal thin-slab casting system (1) which comprises at least one dispensing vessel (5) for a melt and a conveyor belt (6) running horizontally downstream of the at least one dispensing vessel (5) in the casting direction. The second casting system is likewise designed as a horizontal thin-slab casting system (1) and/or as a vertical thin-slab casting system (2), which comprises at least one mold (4) for vertically casting slabs and a bending and straightening device (7) for bending and straightening the vertically casted slabs into a horizontal position. A rolling train (11) for rolling the casted slabs lies downstream of the at least two casting lines, and the at least two casting lines are designed such that the slabs, each of which is cast using one of the at least two casting lines, can be conveyed to the rolling train (11).

Description

Plant and method for casting and rolling metal

Field of the invention

The invention relates to an apparatus and a method for casting and rolling of metal, in particular steel, by means of casting plants and downstream rolling mill. For the sake of clarity, some terms will be clarified at this point, which are used synonymously in the context of the present description. The terms "thin slabs" and "slabs" refer to thin slabs (5-35 mm thick), thin slabs (35-90 mm thick), medium thick slabs (90-150 mm thick) or pre-ribbons (20-50 mm thick).

The term "horizontal thin-slab casting plant" in the context of the present description is synonymous with a horizontal strip casting plant, in particular a BCT plant (Belt Casting Technology) or a DSC plant (Direct Strip Casting).

In the context of the present description, the term "vertical thin-slab casting plant" covers in particular the following plant types: thin-slab casting plants in a "compact strip production", a vertical casting plant with subsequent bending and straightening device for a strand with still liquid bottoms, a vertical casting plant with subsequent turning and straightening device for a solidified strand (eg a CSP plant) or a circular arc casting plant.

State of the art The document EP 1 708 830 B1 shows a CSP plant which is designed for the production of thin slabs having a thickness of about 50 mm. In particular, in this document, a two-strand system is shown. The strands produced in this plant are fed to a common rolling mill. The transport of the strands is done by so-called pivoting ferries. In addition, a parallel rolling mill for conventional thick slabs or medium-thick slabs is arranged, which is preceded by a zweigerüstige roughing, are reduced to be introduced into the CSP line slabs to a thickness of about 50 mm. For the slamming of slabs into the CSP line, a roughing stand or a sheet rolling mill stand is connected upstream.

In the patent EP 1 318 876 B1, two CSP plants are provided, to which a rolling train is arranged downstream. One of these plants is used for the production of carbon steel and another for the production of stainless steel. The steel slabs are bent in these CPS plants.

In view of the above-described prior art, the technical problem of developing a known device and a known method for casting and rolling of metal in such a way that they are also suitable for the production of high or high alloy steels and thin tapes.

DISCLOSURE OF THE INVENTION The technical problem is solved by the metal pouring and rolling apparatus according to the invention, which comprises at least a first and a second casting line for casting slabs and means for transporting slabs cast in the first casting line into the second casting line and a rolling line Rolling of the cast slabs comprises, wherein the first casting line is formed as a horizontal thin slab casting plant, the at least one task vessel for a melt and in the casting direction behind the The second casting line is likewise designed as a horizontal thin slab casting installation or is designed as a vertical thin slab casting installation comprising at least one mold for vertical casting of slabs and a bending and straightening device for bending the vertical and wherein one of the two casting lines is followed by a rolling line for rolling the cast slabs and the at least two casting lines and the means for transport are formed such that the respectively cast with one of the at least two casting lines slab fed to the rolling train can be.

By means of this device according to the invention, a rolling train can be better utilized. In addition, even an existing rolling mill can be better utilized by expansion with additional casting lines. Moreover, by providing a horizontal thin-slab caster, it is possible to produce high or high-alloy steels, as well as crack-sensitive steels and in particular steels with a high aluminum content, since the thin slabs in the horizontal thin-slab caster are driven by the moving mold or belt do not come into contact with casting powder. The combination with the horizontal thin-slab casting plant also achieves a fine grain structure through fast solidification and a low tendency to segregation. In addition, oscillation marks on the cast product can be avoided by a co-rotating mold. Any cracks, bending or straightening damages are also avoided. In addition, the additionally provided thin slab casting plant can also be used to produce standard steels. Overall, therefore, the production program or spectrum is significantly expanded, in contrast to known devices. By using the thin slab technology, strips with a thickness of less than 1 5 mm can also be produced directly, whereby the rolling effort in the rolling train is significantly reduced. In a preferred embodiment of the device, each of the at least two casting lines is designed as a horizontal thin-slab casting plant, which is followed by the rolling train to m rolls of the slabs cast in the horizontal sludge casting plants. By this arrangement, even a device comprising only horizontal thin slab casting machines can be operated cost-effectively.

In a further preferred embodiment of the device, the at least two casting lines are designed to cast slabs of such a small thickness that no roughing stand for rolling the slabs prior to entry into the rolling train is necessary for the cast slabs. Such an arrangement saves space, energy and costs.

In a further preferred embodiment of the device, the thin slab caster is designed for casting and rolling slabs having a thickness between 40 mm and 1 20 mm and / or the horizontal thin slab caster for casting and rolling slabs with a thickness between 5 mm and 35 mm (preferably 10 mm and 20 mm) formed.

In a further preferred embodiment of the device, the at least one horizontal thin-slab casting installation is designed for casting high-alloy and highest-alloyed steels.

In a further preferred embodiment of the device, at least one tempering device, in particular a furnace, is arranged in the casting direction behind the conveyor belt of the at least one thin-slab casting plant and / or at least one tempering device, in particular an oven, behind the bending device of the at least one thin-slab casting plant in the casting direction , In a further preferred embodiment of the device, the means for transporting slabs cast in one of the at least two casting lines are men in another of the at least two casting lines by ferries, in particular pivoting, formed and / or the ferries designed such that the transport takes place in a portion of the temperature control of the other casting line of the at least two casting lines. In a further preferred embodiment of the device, the at least two casting lines are arranged parallel to one another and / or next to one another.

In a further preferred embodiment of the apparatus, the apparatus comprises a total of three casting lines, which are arranged parallel to one another, wherein in the casting direction behind the middle of the three casting lines, the rolling mills is arranged for rolling the slabs cast in the casting lines. Furthermore, the invention comprises a method for casting and rolling metal with at least two casting lines, also referred to as first and second casting line, for casting slabs, in particular with the device according to one of the preceding claims, wherein thin slabs are cast horizontally in at least one of the casting lines and in at least one other casting line also thin slabs are cast horizontally and / or slabs poured vertically and / or in the arc and bent during or after casting in a horizontal direction, the cast slabs are then fed exactly to a rolling mill. The advantages of the method according to the invention largely correspond to those of the device according to the invention.

In a preferred embodiment, in the process, the horizontally cast thin slabs are formed by steels having an aluminum content of up to 10%. In a further preferred embodiment of the method, the horizontally cast thin slabs are formed by steels having an aluminum content between 1% and 3%.

In another preferred embodiment of the method, the horizontally cast thin slabs are formed by carbon steels, low alloy steels, high alloy steels or peritectic steels.

Brief description of the figures

The figures of the embodiments will be briefly described below. Further details can be found in the detailed description of the embodiments. Show it:

FIG. 1 a shows a schematic plan view of an exemplary embodiment of a device according to the invention in which a horizontal thin-slab casting installation can be connected via pivoting ferries to a two-strand thin-slab casting installation;

FIG. 1 b shows a perspective view of the device according to FIG. 1 a, but with a common distributor channel for the two-strand vertical thin-slab casting installation;

FIG. 1c shows a schematic plan view of an exemplary embodiment of a device according to the invention analogous to FIG. 1a, but with a shorter tempering section;

FIG. 1 d: a perspective view of the device according to FIG. 1 c;

FIG. 2a shows a schematic plan view of an exemplary embodiment according to the invention with a thin-slab casting plant, including orderly rolling mill and two horizontal thin slab casters which can be connected to this plant via swivel ferries;

FIG. 2b shows a perspective view of the device according to FIG. 2a; 3a shows a schematic plan view of an embodiment according to the invention with a horizontal thin-slab casting plant including downstream rolling mill and two other connectable with this system via pivoting horizontal thin slab casting plants;

FIG. 3b shows a perspective view of the device according to FIG. 3a;

Figure 4a is a schematic plan view of an embodiment according to the invention of three horizontal thin slab casting plants, which are fed via a common distribution channel and can be connected to each other by pivoting ferries and which a common rolling line is arranged downstream;

FIG. 4b: a perspective view of the device according to FIG. 4b.

Detailed description of the embodiments

FIG. 1a shows an embodiment of a device according to the invention with two CSP plants 2 or vertical thin slab casting plants 2. These vertical thin slab casting plants 2 are known per se. In these systems 2, a strand is first cast vertically with a mold 4 and subsequently bent by means of a bending device 7 and finally directed with a straightening unit. Optionally, a separating device 8 or a pair of scissors 8 is provided further in the casting direction. Subsequently, the slabs reach a downstream tempering device 9, in particular a Oven 9. There, for example, the braziers can be heated or kept at a certain temperature.

In addition to the two CSP casting lines 2, a horizontal thin slab casting plant 1 is arranged. This is preferably located parallel to one of the vertical thin-slab casting plant 2. The plant 1 shown above in FIG. 1a has a feed vessel 5 for the melt and a conveyor belt 6 onto which the liquid melt is passed and on which Metal band begins to solidify. The subordinate is provided in Figure 1 a, a tempering zone or device 9.

In the exemplary embodiment shown in FIG. 1, swinging ferries 10 are furthermore provided in order to transport the slabs from the end of the two outer casting lines to the casting line arranged in the middle. The construction of panning ferries 10 is known to those skilled in the art. Alternatively, parallel ferries may also be provided according to the invention, as they are also generally known. Optionally, the temperature control regions 9 may be designed as roller hearth furnaces, in particular the ferries 10 are designed as (tunnel) furnace ferries. By appropriate use of the ferries

1 0 slabs of each of the three systems 1, 2 of a downstream rolling mill 1 1 can be supplied. In particular, as shown, a total of three casting lines or plants 1, 2 are arranged side by side. The rolling mill

1 1 is preferably in line with the middle of the three casting lines. The slabs produced by the outer lines can then be transported by means of the ferries 10 into a section of the tempering device 9 which is in line with the rolling train 11. In general, it is also possible that it is intended for one or more of the casting lines to introduce slabs from outside into one of the casting lines. Furthermore, in one of the casting lines, an additional roughing stand can also be provided in order to roll introduced slabs. The design of the casting plants 1, 2 downstream rolling train 1 1, including preferably several rolling stands 12, is not in the focus of the invention and is carried out in a known manner. FIG. 1 b shows the device according to FIG. 1 a, wherein the molds 4 of the vertical thin-slab casting-rolling plants 2 are supplied with melt by a common distributor channel 3. By the device according to Figures 1 a and 1 b, the advantages of the horizontal thin slab casters 1 with those of the vertical thin slab casters 2 can be combined. The rolling mill 1 1 is well utilized, since three casting lines supply a rolling mill 1 1. If a thin slab caster 1 were to be provided per se, the investment would be relatively high for a rolling mill 1 1 measured on the produced amount of the thin slab caster 1. If a vertical thin-slab caster 2 is already present in a factory, then this can be expanded by a horizontal thin-slab casting installation 1, whereby the cost-effectiveness of the already existing rolling train 11 is increased and the production spectrum is widened.

Figures 1 c and 1 d show a similar inventive embodiment of a device such as Figures 1 a and 1 b. In contrast to the device shown in FIGS. 1 a and 1 b, the horizontal thin-slab casting installation 1 (shown at the top in FIGS. 1 b and 1 c) is, however, designed with a shorter temperature-control device 9. Such systems can now be operated more economically, although they have only a relatively short Tem perierungsbereich 9 for temporary storage of thin or thin slabs. The remaining arrangement is equivalent to the arrangement shown in Figures 1 a and 1 b.

Figure 2a shows a vertical thin slab casting plant 2, which is downstream of a rolling mill 1 1 in line. In addition to this plant horizontal thin slab casting plants 1 of a type are arranged on both sides, as it is already shown in Figures 1 b and 1 c. Analogous to the previously described embodiments, slabs can be transported by means of ferries 10 from the two external Thin slab casting plants 1 or casting lines via the ferries 10, preferably from the end of the respective temperature control device 9, are transported or passed into a section of the temperature control region 9 of the central casting line or the thin slab casting plant 2. This section is preferably, seen in the casting, in a central region of the tempering device 9 of the vertical thin slab casting 2. Gone slabs from the outer casting lines in this section, they preferably still pass through part of the Temperierungsbereichs 9 and then the rolling train 1 1 fed , FIG. 2b shows the same arrangement as FIG. 2a, but in a perspective view. The reference numbers are to be understood analogously to the characters in FIGS. 1 a to 1 d.

Figures 3a and 3b show a further embodiment of an inventive device in a plan view and in a perspective view. In this embodiment, three horizontal Dünnbrammen- casting machines 1 are arranged side by side, wherein the arranged in the middle of the three plants thin slab casting plant 1 in line or in the same flight a rolling mill 1 1 is arranged downstream. Analogous to the previous exemplary embodiments, a ferry system 10 is provided for transporting slabs from the external systems to the centrally arranged system or casting line.

Figures 4a and 4b are to be regarded as analogous to Figures 3a and 3b, but all casting lines are supplied by a common distributor trough 3 with melt. One can also speak in this case of a three- or multi-strand system that supplies a rolling mill 1 1.

In general, features from all figures can be combined with each other or individual structural details can be adapted by the person skilled in the respective application. LIST OF REFERENCE NUMBERS

1 Horizontal thin slab caster

2 Vertical thin slab caster

3 distributor trough

4 mold

5 task vessel

6 conveyor belt

7 bending device / straightening device

8 separating device

9 tempering device

10: Swing ferry

1 1: rolling mill

12: rolling stand

Claims

claims

1 . Apparatus for casting and rolling metal, comprising:

at least a first and a second casting line for casting slabs;

Means for transporting slabs cast in the first casting line into the second casting line; and

a rolling mill for rolling the cast slabs,

characterized,

in that the first casting line is designed as a horizontal thin-slab casting installation (1) which comprises at least one feeding vessel (5) for a melt and a conveyor belt (6) running horizontally in the casting direction behind the at least one feeding vessel (5); and that the second casting line is likewise designed as a horizontal thin slab casting installation (1) or as a vertical thin slab casting installation (2), which has at least one mold (4) for vertical casting of slabs and a bending and straightening device (7) for Turning and straightening the vertically cast slab into a horizontal layer comprises, and

in that the rolling train (1 1) for rolling the cast slabs is arranged downstream of one of the two casting lines and the at least two casting lines and the means for transport are designed such that the slabs cast in each case with one of the at least two casting lines are fed to the rolling train (11) can be.

2. The device according to claim 1, wherein each of the at least two casting lines is designed as a horizontal thin-slab casting installation (1). NEN the rolling train (1 1) is arranged downstream for rolling in the horizontal thin slab casters (1) cast slabs.

The device according to one of the preceding claims, wherein the at least two casting lines are designed to cast strips of such a small thickness that no roughing stand for rolling the slabs prior to entry into the rolling train (11) is necessary for the cast slabs.

The apparatus according to any one of the preceding claims, wherein the vertical thin slab caster (2) is for casting slabs having a thickness between 40 mm and 120 mm and / or the horizontal thin slab caster (1) for casting slabs with a thickness between 5 mm and 35 mm, preferably 10 mm and 20 mm.

The device according to one of the preceding claims, wherein the at least one horizontal thin slab casting installation (1) is designed for casting high-alloy and highest-alloyed steels.

The device according to one of the preceding claims, wherein at least one tempering device (9), in particular a furnace (9), is arranged in the casting direction behind the conveyor belt (6) of the at least one thin-slab casting plant (1) and / or in the casting direction behind the bend - And straightening device (7) of the at least one vertical thin slab casting plant (2) at least one tempering device (9), in particular a furnace (9) arranged.

The device according to one of the preceding claims, wherein the means for transporting slabs cast in one of the at least two casting lines are formed into another of the at least two casting lines by ferries (10), in particular pivoting ferries (10), and / or the ferries are designed such that the transport takes place in a section of the tempering device (9) of the other casting line of the at least two casting lines.

8. The device according to one of the preceding claims, wherein the at least two casting lines are arranged parallel to each other and / or side by side.

9. The device according to one of the preceding claims, wherein the device comprises a total of three casting lines, which are arranged side by side in parallel, wherein the rolling mills (1 1) for rolling the slabs cast in the casting lines in the casting direction behind and / or in line with the middle the three casting lines is arranged.

10. Method for casting and rolling metal, with at least two casting lines for casting slabs, in particular with the device according to one of the preceding claims,

characterized,

that thin slabs are cast horizontally in at least one of the casting lines and also thin slabs are cast horizontally in at least one further casting line and / or slabs are cast vertically and bent in a horizontal direction, wherein the cast slabs are then fed exactly to a rolling train (1 1).

1 1. The method of claim 10, wherein the horizontally cast thin slabs are formed by steels having an aluminum content of up to 10%.

12. The method of claim 10 or 11, wherein the horizontally cast thin slabs are formed by steels having an aluminum content between 1% and 3%. The method of any one of claims 10 to 12, wherein the horizontally cast thin slabs are formed by carbon steels, low alloy steels, high alloy steels or peritectic steels.