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CN-122003303-A - Apparatus and method for producing a metal strip in continuous or batch mode

CN122003303ACN 122003303 ACN122003303 ACN 122003303ACN-122003303-A

Abstract

The present invention relates to a combined casting and rolling method that can be operated not only in a continuous mode of operation but also in a batch mode of operation. The object of the present invention is to provide a compact installation for producing metal strips, which installation can be operated both in continuous mode and batch mode. On the one hand, the object is achieved in that the tapping device (5 a) and the feeding device (5 b) are arranged between the first casting device (1) and the rolling mill (8). The guiding device (5 a) can guide the cut first slab (40) transversely to the casting direction (G). A feeding device (5 b) for feeding in cut slabs (41) having a heating furnace (5 c) is arranged immediately after the discharge device (5 a). The distance (L) between the end of the first casting device (1) and the beginning of the rolling mill (8) is less than 100m, preferably less than 80m, particularly preferably less than 60m.

Inventors

  • G. SCHWARZ
  • A. Salinger
  • M. FISCHER
  • E. Montazarrolzohor
  • J. Scholer
  • I. Waqingge
  • M. La Di Di Di

Assignees

  • 首要金属科技奥地利有限责任公司

Dates

Publication Date
20260508
Application Date
20241008
Priority Date
20231010

Claims (15)

  1. 1. An apparatus for manufacturing a metal strip, comprising the following apparatus components: A continuous first casting device (1), wherein the end of the casting device (1) is determined by a strand guide roll (31) arranged as the last strand guide roll, A first dividing device (3) arranged downstream of the first casting device (1) for dividing the first slab (40), A rolling mill (8) arranged downstream of the first dividing device (3), wherein the beginning of the rolling mill is determined by a rolling stand (8 a) arranged as a first rolling stand, A shear (14) arranged downstream of the rolling mill (8), A reel-up (15) arranged after the shear (14), An automation device (45) which can operate the apparatus in such a way that the apparatus can be operated in a continuous or batch mode of operation, It is characterized in that the method comprises the steps of, Between the first dividing device (3) and the rolling mill (8) -Arranging a guiding device (5 a) for the cut first slab (40) capable of guiding the cut first slab (40) transversely to the casting direction (G), wherein A feeding device (5 b) for feeding cut slabs (41) having a heating furnace (5 c) is arranged immediately downstream of the tapping device (5 a), wherein the feeding device (5 b) can feed cut slabs (41) transversely to the casting direction (G), wherein The delivery device (5 a) and the supply device (5 b) are designed in such a way that the cast first slab (41) can be transported directly from the delivery device (5 a) into the supply device (5 b) in the casting direction (G) and can be guided further by the supply device (5 b) in the casting direction (G), Wherein the method comprises the steps of The distance (L) between the end of the first casting device (1) and the beginning of the rolling mill (8) is less than 100m, preferably less than 80m, particularly preferably less than 60m, wherein A continuous second casting device (2) having a second dividing device (4) is arranged parallel to the first casting device (1), wherein the second casting device (2) is connected to the supply device (5 b) and the heating furnace (5 c) by means of a first connecting device (18), preferably a roller table, in such a way that a second slab (42) produced by the continuous second casting device (2) can be fed to the heating furnace (5 c) and the supply device (5 b).
  2. 2. The plant for producing metal strip according to claim 1, characterized in that the tapping device (5 a) and the feeding device (5 b) and the heating furnace (5 c) are connected to each other in such a way that the cut first slabs (40) fed out by the tapping device (5 a) can be fed into the heating furnace (5 c) and the feeding device (5 b), preferably by means of a slab conveying device (16).
  3. 3. The plant for manufacturing metal strips according to any one of claims 1-2, characterized in that the automation mechanism (45) is capable of handling the lead-out device (5 a) and the supply device (5 b) in such a way that the first slab (40) cut at the first dividing device (3) can be transported to the rolling mill (8) at a transport speed, wherein the transport speed is greater than the casting speed of the first casting plant (1).
  4. 4. An apparatus for producing metal strips according to any of claims 1-3, characterized in that the heating furnace (5 c) is preferably a walking furnace, wherein the cut slabs are directed in the casting direction (G) in the heating furnace (5 c) transversely to the casting direction (G) to a feed device (5 b), wherein preferably the heating furnace (5 c) has at least two movement zones (5 d) which can be operated independently of one another, wherein a first movement zone (5 d) of the walking furnace is assigned to the feed device and a second movement zone (5 e) is assigned to a feed opening of the heating furnace for the cut slabs.
  5. 5. The plant for manufacturing metal strips according to any one of claims 1-4, characterized in that the heating furnace (5 c) has a maximum length of 30 m.
  6. 6. The plant for manufacturing metal strips according to any one of claims 1-5, characterized in that the feeding means (5 c) and the heating furnace (5 c) are connected to a conveyor (17), wherein the conveyor (17) is capable of feeding cold slabs (43), preferably from a slab warehouse.
  7. 7. An apparatus for manufacturing metal strips according to claim 6, characterized in that the conveyor means (17) comprise a heating furnace (23).
  8. 8. The plant for manufacturing metal strips according to any one of claims 1 to 7, characterized in that the minimum length of the feeding means (5 b) and of the deriving means (5 a) is calculated by means of the formula: Wherein a is a design factor, Y is the specific gravity of the coil in t/m with respect to its width, ρ is the density in t/m 3 at the temperature after casting in the first casting device, and d is the maximum settable casting gap in m of the first casting device.
  9. 9. Plant for manufacturing metal strips according to any of the claims 1-8, characterized in that the length of the feeding means (5 b) and the guiding means (5 a) is at most 30m, preferably at most 25m, particularly preferably at most 20m, respectively.
  10. 10. An apparatus for producing a metal strip comprises the following apparatus components A continuous first casting device (1), wherein the end of the casting device (1) is determined by a strand guide roll (31) arranged as the last strand guide roll, A first dividing device (3) arranged downstream of the first casting device (1) for dividing the first slab (40), A rolling mill (8) arranged downstream of the first dividing device (3), wherein the beginning of the rolling mill (8) is determined by a rolling stand (8 a) arranged as a first rolling stand, A shear (14) arranged downstream of the rolling mill (8), A reel-up (15) arranged after the shear (14), An automation mechanism (45) capable of operating the plant in such a way that the plant can be operated in a continuous or batch mode of operation, It is characterized in that the method comprises the steps of, Between the first dividing device (3) and the rolling mill (8) A first induction heating furnace (25) is arranged, A slab handling device (25 a) for feeding and discharging cut slabs is arranged immediately after the first induction heating furnace (25), wherein The slab handling device (25 a) can feed or discharge a cut slab transversely to a casting direction (G) and can transport the cut slab along the casting direction, wherein The slab handling device (25 a) is connected to the first induction heating furnace (25) in such a way that the cast first slab can be fed directly into the slab handling device (25 a), wherein The distance between the end of the first casting device (1) and the beginning of the rolling mill (8) is less than 100m, preferably less than 80m, particularly preferably less than 60m, A continuous second casting device (2) having a second dividing device (4) is arranged parallel to the first casting device (1), wherein the second casting device (2) is connected to a second induction heating furnace (28) by means of a first connecting device (18) in order to supply a second slab (42) produced by the second casting device (2) to the second induction heating furnace (28), wherein the slab conveying device (16) is connected to the second induction heating furnace (27) in such a way that the second slab (42) can be supplied to the slab handling device (25 a) by means of the slab conveying device.
  11. 11. An apparatus for producing a metal strip according to claim 10, characterized in that the length of the first induction heating furnace (25) and the second slab handling device (25 a) are at most 30m, preferably at most 25m, particularly preferably at most 20m.
  12. 12. An apparatus for manufacturing metal strips according to any of the claims 10-11, characterized in that the slab handling device (25 a) is connected to a conveyor (17), wherein the conveyor (17) is capable of feeding cold slabs (43), preferably from a slab warehouse.
  13. 13. An apparatus for manufacturing metal strips according to any of the claims 1-12, characterized in that a first slab (40) having a thickness of 100 to 200mm, preferably 120 to 160mm, can be produced by means of the first casting apparatus (1).
  14. 14. An apparatus for manufacturing metal strips according to any of the claims 1-12, characterized in that the continuous second casting apparatus (2) produces a second slab having a thickness range substantially corresponding to the thickness range of the first slab or a second slab (42) having a maximum thickness of 250mm, preferably the second slab being reducible in thickness by means of a roughing stand (20).
  15. 15. Method for manufacturing a metal strip with the plant according to any one of claims 1-14, characterized in that the plant can be operated in a continuous operation mode or in a batch operation mode by means of an automation mechanism (45) depending on the mechanical strength, thickness, CO 2 footprint, and/or casting speed of the metal strip to be produced.

Description

Apparatus and method for producing a metal strip in continuous or batch mode Technical Field The present invention relates to the field of combined casting and rolling methods that can be operated not only in continuous operation mode but also in batch operation mode. In one aspect, the invention relates to an apparatus for manufacturing a metal strip, the apparatus comprising the following apparatus components: A first continuous casting device, the end of which is defined by a strand guide roll arranged as the last strand guide roll, -A first dividing device arranged downstream of the first casting device for dividing the first slab; A rolling mill arranged downstream of the first dividing device, wherein the beginning of the rolling mill is determined by a rolling stand arranged as a first rolling stand, A shear arranged after the rolling mill, A reel-up arranged after the shear, An automation device that can handle the apparatus in such a way that the apparatus can be operated in a continuous or batch mode of operation. In another aspect, the invention relates to a method for manufacturing a metal strip with said apparatus. Background The combined casting and rolling process currently replaces the traditional slab casting and hot strip rolling train process. The most important advantages of the combination of casting and rolling methods in continuous operation mode are: Minimal energy consumption Reduced CO2 emissions or no CO2 emissions at all Production of ultra-thin strips Highest uniform quality in continuous mode of operation Lower investment costs Less running costs. Since in the continuous mode of operation the mass flow through the entire device is essentially constant and cannot exhibit a stepwise acceleration for spanning longer distances, many of the advantages of continuous operation are coupled to the short overall length of the device. However, in order to completely replace the existing hot strip rolling train and all its products, single-stream casting and rolling installations are in many cases inadequate due to the mass flow limitations of the casting methods of today. The maximum mass flow that continuous casting plants can currently provide is in the range of 7 to 8 tons per minute. This results in a maximum annual throughput of about 3 million tons per year. For high power hot rolling mills, the throughput is between 4 and 6 million tons per year (Mt/J), i.e. it can be exactly twice as high as in continuous casting plants. Thus, steel manufacturers try to combine two continuous casting plants with one rolling mill in order to achieve the same yield, e.g. 2.5Mt/J with casting plant 1+ 2.5Mt/J with casting plant 2 = 5Mt/J for one rolling mill. By definition, this means that it is not possible to produce a continuous operation that is durable when producing two casting strands. Because many of the high quality requirements (ultra-thin and high-grade) can only be produced in continuous operation mode, steel manufacturers desire an apparatus that meets both: -a continuous plant for producing ultra-thin, high-grade quality; High-throughput equipment for combining two casting devices with one rolling mill. An apparatus should meet the following requirements: -at the position of Thickness of 0.6 to 32mm, preferably 0.8 to 25.4mm Width 600 to 2600mm, preferably 900 to 2134mm Flat sheet production in the size range of (2) All steel grades having a carbon content of 0.001% to 1%, preferably 0.005% to 0.5% Standard quality requiring high productivity is produced by means of rapid casting Special qualities requiring slow solidification are produced by means of slow casting Productivity of 3 to 8 Mt/J (preferably 4 to 6 Mt/J). Due to the need for continuous production, there has recently been a development scheme that uses a continuous operation mode also on a combined dual-flow slab casting-and-rolling plant. These solutions are currently distinguished by the large distances between the casting train and the rolling train, which are required in order to connect the production of two strands to one another. In order to overcome the heat loss when transporting slabs from the casting machine to the rolling mill, tunnel furnaces having a length of 150 to 250m are currently proposed. These ovens, while highly effective in preventing temperature loss, are very energy and maintenance intensive. Furthermore, the furnace is always in operation in a production line with rolling mills, even in continuous production. But create concepts based on two-billet casting-and-rolling schemes that also provide a viable solution for production from one continuous casting billet in a continuous mode of operation. These solutions all have a long tunnel furnace and a heated ferry vehicle (F ä hre) before the rolling mill, which take on the task of buffering and merging in batch mode of operation. For batch runs, two furnaces each having a length of up to 250m must be heated continuously, which results in high energy con