EP1980345B1 - Herstellungsverfahren für ein durchgehendes stahlformteil und system zur behandlung eines oberflächenfehlers des formteils - Google Patents

Herstellungsverfahren für ein durchgehendes stahlformteil und system zur behandlung eines oberflächenfehlers des formteils Download PDF

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Publication number
EP1980345B1
EP1980345B1 EP07737461.9A EP07737461A EP1980345B1 EP 1980345 B1 EP1980345 B1 EP 1980345B1 EP 07737461 A EP07737461 A EP 07737461A EP 1980345 B1 EP1980345 B1 EP 1980345B1
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EP
European Patent Office
Prior art keywords
slabs
defects
surface layer
conditioning
sheets
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EP07737461.9A
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English (en)
French (fr)
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EP1980345A4 (de
EP1980345A1 (de
Inventor
Jun Kubota
Yukinori Iizuka
Hajime Takada
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JFE Steel Corp
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JFE Steel Corp
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    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Definitions

  • the present invention relates to a method of producing a continuous casting slab of steel, according to the preamble of claim 1 and to a conditioning system of surface layer defects according to the preamble of claim 4.
  • US 6,436,205 B1 there is described a method for surface processing of a continuously cast steel product and device therefor.
  • at least a portion of at least one metal product surface is cooled for a defined temperature decrease of a surface to be treated and a surface treatment is then performed.
  • the device has a cooling device for cooling at least a portion of at least one metal product surface for a defined temperature decrease of a surface to be treated and a surface treatment device downstream of the cooling device in the product conveying direction.
  • the production arrangement for this has a continuous slab casting device, a heating arrangement with at least one of a heating device and a temperature equilibration device arranged downstream of the casting device.
  • a hot mill train is arranged downstream of the heating arrangement in the conveying direction.
  • the surface processing device for removing surface flaws has a device for cooling at least a portion of at least one metal product surface for a defined temperature decrease of a surface to be treated and a surface treatment device downstream of the cooling device in the product conveying direction.
  • the surface processing device is arranged between the casting device and the hot mill train.
  • slab continuous casting slab
  • defects such as inclusions of surface layers of slabs
  • the surface conditioning of slabs is often performed by, for example, partial scarfing or overall scarfing using a oxygen torch, or partial grinding or overall grinding using a grinder.
  • partial scarfing or overall scarfing using a oxygen torch or partial grinding or overall grinding using a grinder.
  • the defects are removed by further performing partial scarfing using an oxygen torch or partial grinding using a grinder.
  • the surface conditioning operations using these methods can be used to remove defects up to a certain depth of a slab
  • the surface conditioning operations cannot be used to remove defects that are deeper than the certain depth. Therefore, for example, a defect in the slab remaining directly below a scarfed surface or a ground surface may become a surface defect of a thin sheet after the slab is rolled into the thin sheet. Consequently, even if the surface conditioning of the slab is performed, the occurrence of the surface defect in the rolled sheet, which is a product, cannot be prevented completely.
  • an attempt is made to remove a deep defect at a slab stage even a flawless portion around the defect is removed, thereby increasing a decrease in yield ratio or increasing the conditioning work time.
  • Japanese Unexamined Patent Application Publication No. 02-15806 proposes a method of producing a stainless steel sheet that does not have scabs.
  • the technology discussed in Japanese Unexamined Patent Application Publication No. 02-15806 corresponds to a method of producing a stainless steel sheet which is subjected to hot rolling.
  • pinholes existing at at least portions near front and rear surfaces of side faces of slabs and existing in the front and rear surfaces of the slabs are detected, after which the portions pinholes having a diameter greater than or equal to 0.2 mm among the detected pinholes are conditioned and removed.
  • Japanese Unexamined Patent Application Publication No. 10-296306 proposes a method of producing a hot-rolled steel sheet.
  • pinholes in a slab prior to rough rolling are detected.
  • the depths of the pinholes from a slab surface, the slab thickness, and the finish rolling thickness are estimated.
  • conditioning is performed at a sheet bar stage or a slab stage prior to the finish rolling.
  • an artificial flaw is previously provided in a slab to perform a rolling test.
  • the depth from a slab surface and the size of pinholes that become surface flaws after the rolling, and rolling reduction are formulated as parameters. Based on this, the sizes of the pinholes to be removed prior to the rolling are determined.
  • pinholes that are formed at deep positions from the slab surface are ground after rough rolling because the grinding amount of the slab at the slab stage is large, thereby decreasing yield ratio.
  • the sizes of pinholes to be removed are estimated on the basis of the result of a rolling test of artificial flaw.
  • the slabs according to the present invention are for ordinary steel sheets.
  • surface layer defects which cause surface detects, include, in addition to pinholes, inclusions, formed of deoxidation products or mold powder, and cracks.
  • the present invention can overcome such related art problems, and has as its object the provision of a method of producing a continuous casting slab of steel, which can restrict the occurrence of surface defects in a thin steel sheet (thin sheet), which is a product, so that the thin sheet (rolled product) has a required surface quality level.
  • the present invention has as its object the provision of a conditioning system of surface layer defects of slabs, which can efficiently remove surface layer defects of slabs, which become surface defects of thin sheets (rolled products).
  • the gist of the present invention is as follows.
  • the conditioning standards are composed of a step 9, in which the surface layer defects data 5A of the slabs 1, which determines the sizes and the three-dimensional positions of the surface layer defects 5 in the slabs 1, is compared with and checked against (9A) surface defects data 6A of sheets 7, which determines sizes (widths, lengths) and two-dimensional positions of the surface defects 6 in the sheets 7, obtained from the slabs 1, and in which features of the surface layer defects 5 of the slabs 1, which become the surface defects 6A of the sheets 7, are extracted (9B), is repeatedly performed on the slabs 1, so that said any surface layer defect 5B that needs to be removed in accordance with steel type and process is determined and classified so that the surface layer defects are capable of being indicated.
  • the two-dimensional positions of the surface defects 6 refer to a position in a production line direction (thin-sheet longitudinal direction), and a position perpendicular to the production line direction (thin-sheet widthwise direction).
  • the width of the surface defects 6 refers to a maximum width in a direction perpendicular to a rolling direction of the thin sheets 7, and the length of the surface defects 6 refers to a maximum length in the rolling direction of the thin sheets 7.
  • the inventors et al. have found out that, to obtain thin sheets 7 (rolled products) having a required surface quality level, it was important to efficiently and completely remove surface layer defects 5B of slabs 1, which become surface defects 6 of the thin sheets 7 (rolled products), which are products. To achieve this, the inventor et al.
  • means 12 of measuring surface layer defects of slabs (surface layer defects measuring device) of an ultrasonic reflection type defects measuring device was used to measure the size (diameter of the equivalent circle) and three-dimensional positions (position in a lengthwise direction of the slabs, position in the widthwise direction of the slabs, and a position from the slab surfaces) of the surface layer defects 5 of the slabs 1 (primarily inclusions). Then, the measured values were stored in a storage means so as to be retrievable.
  • Fig. 5 stored surface layer defects data 5A of the slabs 1 and surface defects data 6A of the steel sheets 7, which are materials of the slabs, were extracted, and compared and checked (9A) to confirm the state of correspondence between the surface layer defects 5 and the surface defects 6.
  • the results of the relationships between the depth (three-dimensional position) of the surface layer defects 5 at the slabs and the size of the surface layer defects are shown in Fig. 5 .
  • the symbol ⁇ stands for surface layer defects 5 that were not detected as surface defects 6 of the steel sheets 7; and the symbol ⁇ stands for surface layer defects 5 that were detected as the surface defects 6 of the steel sheets.
  • Fig. 5 the same scabs level ranges of the surface defects 6 were divided. From Fig. 5 , it can be understood that boundary lines between the ⁇ and ⁇ , or division lines of the scab levels can be used as the features (three-dimension positions, sizes) of the surface layer defects 5B of the slabs to be removed.
  • the inventor et al. have conceived that setting the features of the surface layer defects 5 of the slabs, which become the surface defects 6 of such products, as predetermined conditioning standards in accordance with a surface quality demand degree of the products (steel sheets), indicating the surface layer defects 5B to be removed, and removing the matched surface layer defects 5 of the slabs at the slab stage can effectively and considerably reduce the occurrence of the surface defects 6 (scabs) of the products.
  • the present invention since the surface layer defects 5, which cause the surface defects of the products (steel sheets 7), can be efficiently removed, the present invention is industrially considerably effective in making it possible to considerably reduce frequency of surface defects of the products and of considerably improving manufacturing yield ratio.
  • it is not necessary to perform overall scarfing and grinding conditioning of the entire slabs, so that the present invention is also effective in making it possible to easily and efficiently produce products required to satisfy strict surface quality level.
  • the present invention makes it possible to efficiently remove all inclusions, which become scabs of the products, without a decrease in yield ratio caused by excessive conditioning or without any scabs remaining due to insufficient conditioning in overall conditioning to a certain thickness.
  • a method of producing a slab according to the present invention includes a continuous casting process 2, in which molten steel is continuously casted into slabs, and a conditioning process 4 of slabs 1, in which the slabs 1 are conditioned after the continuous casting process 2.
  • the means 12 of measuring surface layer defects of the slabs measures the surface layer defects of the slabs 1, to extract the surface layer defects data 5A of the slabs. From the obtained results, the surface layer defects 5B that need to be removed are removed by the conditioning process 4 of the slabs. This procedure is schematically illustrated in Fig. 4 .
  • the sizes (diameters of the equivalent circle) and the three-dimensional positions of the surface layer defects 5 of the slabs 1 to be measured are determined.
  • Examples of the surface layer defects 5 of the slabs 1 are inclusions, blowholes, and cracks.
  • conditioning places and depths of the slabs 1 become clear, so that conditioning is facilitated, and correspondences between the surface layer defects 5 and the occurrence of the surface defects of the steel sheets 7 after rolling can be easily made clear.
  • the obtained surface layer defects data is, as the surface layer defects data 5A of the slabs 1, is stored in surface layer defects database 5C of the slabs so that it can be searched.
  • Fig. 3 on the basis of predetermined conditioning standards 8, that is, by comparing data (5B'), which is indicated in the conditioning standards 8, of the surface layer defects 5B that need to be removed with the surface layer defects data 5A of the slabs 1, a determination is made as to whether or not the surface layer defects 5 of the slabs correspond to the surface layer defects 5B that need to be removed.
  • the conditioning standards 8 it is desirable that the surface layer defects that need to be removed in accordance with steel type, sheet thickness, and process be classified (so that they can be indicated) so as to be searchable.
  • Fig. 6 shows example conditioning standards 8. For example, in Fig.
  • the slabs 1 having the surface layer defects 5 that are determined as corresponding to the surface layer defects 53 that need to be removed are immediately conveyed to the conditioning process 4 of the slabs, and are removed by means 11 of conditioning the slabs.
  • Any means of conditioning the slabs may be used for the means 11 of conditioning the slabs as long as it is a device of a type that is connected to a process computer and that is automatically operated, and that can remove local defects. Accordingly, the means 11 is not particularly limited.
  • Example means 11 may be those that perform scarfing using an oxygen torch or grinding using a grinder.
  • the slabs 1 whose surface layer defects 5B that need to be removed in the slab conditioning process 4 have been removed, or the flawless slabs 1 whose surface layer defects 5B do not need to be removed are subjected to the following processes, that is, the hot rolling process 21 and the cold rolling process 22, or are further subjected to a surface treatment process 23, so that they are formed as the products 7 (steel sheets).
  • the procedure is shown in Fig. 3 .
  • a surface inspection process 24 in a surface inspection process 24, the products 7 (steel sheets) are inspected by the means 13 of measuring surface layer defects to determine whether or not surface defects 6 exist.
  • the conditioning standards 8 need to be such that the data (5B') of the surface layer defects 5B that need to be removed in accordance with steel type, process, use, sheet thickness, etc., can be classified, searched, checked, indicated, and updated. As shown in Fig. 2 , it is desirable that it be predetermined by the following procedure.
  • the means 12 of measuring the surface layer defects of the slabs is used to obtain the surface layer defects data 5A of the slabs that determines the sizes and the three-dimensional positions of the surface layer defects 6 of the slabs 1.
  • the means 12 of measuring the surface layer defects of slabs any one of the following surface layer defects measuring devices, that is, an ultrasonic reflection type defects measuring device, a transmitting type defects measuring device using radiation such as X rays or ⁇ rays, and a leakage magnetic flux type defects measuring device, may be suitably used.
  • the slabs 1 are subjected to the hot rolling process 21, the cold rolling process 22, or the surface treatment process 23 to form the steel sheets 7.
  • the means 13 of measuring the surface layer defects of the steel sheets is used to determine the sizes (width, length) and two-dimensional positions of the surface defects 6 (surface scabs, etc.) of the steel sheets. Accordingly, the surface defects data 6A of the steel sheets obtained as the materials of the slabs is obtained. Examples of the surface defects 6 of the steel sheets may include scabs, sliver, and blisters.
  • any one of the following surface defects measuring devices that is, a surface defects measuring device based on image data processing and online continuous photography of the surfaces of the steel sheets 7 (coils), and a leakage magnetic flux type measuring device, may be suitably used.
  • the obtained surface defects data 6A is stored in the storage means of the database 5C of the surface layer defects of the slabs and database 6C of surface layer defects of the steel sheets so that it can be retrieved, searched, and checked. It is desirable that the surface layer defects data 5A of the slabs 1 and the surface defects data 6A of the steel sheets 7, which are the materials of the slabs 1 be constantly collected and accumulated online.
  • the obtained surface layer defects data 5A of the slabs 1 and the surface defects data 6A of the steel sheets 7, which are the materials of the slabs 1, are compared with each other (9A), so that features regarding the sizes and the three-dimensional positions of the surface layer defects 5B of the slabs 1, which become the surface defects 6 of the steel sheets 7, are extracted (9B).
  • This step is repeatedly performed on the plurality of slabs 1, to provide the conditioning standards 8 in which the features (the sizes (diameters of the equivalent circle), three-dimensional positions) of the surface layer defects 5 of the slabs 1, which need to be removed in accordance with steel type, process, use, sheet thickness, etc., because they become the surface defects 6 of the steel sheets 7, can be classified, searched, checked, and indicated.
  • the obtained conditioning standards 8 are stored in the storage means of conditioning standard database 14 so that it can be retrieved and updated.
  • the features (the sizes (diameters of the equivalent circle), three-dimensional positions) of the surface layer defects 6 of the slabs 1, which become the surface defects 6 of the steel sheet products 7, can be extracted and indicated as the conditioning standards 8 in accordance with, for example, steel type, process, or use, or the sizes (widths, lengths) of the surface defects 6 (surface scabs) of the steel sheets 7.
  • the surface layer defects data 5A of the slabs 1 and the surface defects data 6A of the steel sheets 7, which are the materials of the slabs 1, be constantly collected and accumulated online.
  • the conditioning standards 8 to be updated periodically or non-periodically on the basis of latest data. This makes it possible to constantly possess the latest conditioning standards 8 in accordance with changes in, for example, casting conditions and rolling conditions.
  • the surface layer defects conditioning system 10 of the slabs 1 used in the present invention comprises the means 12 of measuring surface layer defects of slabs, the means 13 of measuring surface defects of steel sheets, the means 15 of calculation, the means 11 of conditioning slabs, the database 5C of surface layer defects of slabs, the database 6C of surface defects of steel sheets, and the conditioning standard database 14.
  • the surface layer defects conditioning system 10 of the slabs 1 is connected to, for example, a high-end process computer and a low-end process computer. It goes without saying that the surface layer defects conditioning system 10 of the slabs 1 is formed so as to allow input of information of, for example, use and process of the steel sheets, which are products, or of the history of, for example, manufacturing conditions and slab composition.
  • the means 12 of measuring surface layer defects of slabs and the means 13 of measuring surface defects of steel sheets, and the means 11 of conditioning slabs 11 are connected to the means 15 of calculation.
  • the database 5C of surface layer defects of slabs, the database 6C of surface defects of steel sheets, and the conditioning standard base 14 are also connected to the means 15 of calculation.
  • the surface layer defects data 5A of the slabs regarding, for example, the three-dimensional positions and sizes of the surface layer defects 5 of the slabs 1 is measured.
  • the surface defects data 6A regarding the sizes (widths, lengths) and the two-dimensional positions of the surface defects 6 of the steel sheets 7, obtained as materials of the slabs 1 is measured.
  • the database 5C of the surface layer defects of the slabs is a database in which the obtained surface layer defects data 5A of the slabs 1 is stored so that it can be input and output along with process-related information such as manufacturing conditions and composition.
  • the database 5C of the surface layer defects of the steel sheets is a database in which the surface defects data 6A of the steel sheets 7, obtained as the materials of the slabs 1, is stored so that it can be input and output along with process-related information such as processes and steel type.
  • the conditioning standard database 14 is a database in which the surface layer defects that need to be removed in accordance with, for example, steel type, process, and use is stored so that it can be input and output as the surface layer defects data 5B that need to be determined, classified, and removed.
  • the surface layer defects data 5A of the slabs 1, measured by the means 12 of measuring surface layer defects of slabs, and the surface layer defects data 5B', which need to be removed in accordance with, for example, steel type, process, and use and is output from the conditioning standard database 14, are input.
  • they are compared (9A), to determine the surface layer defects 5B that need to be removed in the conditioning slabs.
  • a signal 16 used to remove the surface layer defects 5B is output to the means 11 of conditioning slabs.
  • the slabs 1 prior to the rolling operations using the means of measuring surface layer defects of slabs (surface layer defects measuring device) of an ultrasonic reflection type shown in Fig. 7 , the sizes and the three-dimensional positions (position in a lengthwise direction of the slabs, position in the widthwise direction of the slabs, and a depth from the front and back surfaces of the slabs) of the surface layer defects 5 (primarily inclusions) of the entire front and back surfaces of the slabs 1 (surface layer defects data 5A) were measured. Then, the surface layer defects data 5A was compared with the data 5A of the surface layer defects to be removed at a slab stage, the data 5A being indicated in the conditioning standards 8 output from the conditioning standard database 14 and used for the present purpose.
  • a slab conditioning operation was performed to selectively remove the surface layer defects 5B that need to be removed by the means 11 of conditioning slabs (a grinder that can perform local conditioning).
  • This corresponds to the example (number of coils 102) of the present invention.
  • Some of the slabs 1 were subjected to overall grinding for a 2mm slab thickness. This corresponds to a comparative example (number of coils 98).
  • the frequency of the surface defects in the example of the present invention was 0.1% on average. In contrast, in the comparative example, it was 1.0% on average.
  • the present invention since the surface layer defects, which cause the surface defects of the products (steel sheets), can be efficiently removed, the present invention is industrially considerably effective in making it possible to considerably reduce frequency of surface defects of the products and of considerably improving manufacturing yield ratio.
  • it is not necessary to perform overall scarfing and grinding conditioning of the entire slabs, so that the present invention is also effective in making it possible to easily and efficiently produce products required to satisfy strict surface quality level.
  • the present invention makes it possible to efficiently remove all inclusions, which become scabs of the products, without a decrease in yield ratio caused by excessive conditioning or without any scabs remaining due to insufficient conditioning in overall conditioning to a certain thickness.

Claims (5)

  1. Verfahren zum Herstellen von Stahlbrammen, umfassend einen Stranggießprozess (2) zum Stranggießen von geschmolzenem Stahl, um Brammen (1) zu formen, wobei Brammen einem Heißwalzprozess (21) und einem Kaltwalzprozess (22), um Bleche (7) zu formen, unterzogen werden, wobei das Verfahren ferner dadurch gekennzeichnet ist, dass es umfasst:
    einen Konditionierprozess für die Brammen (1) zum Konditionieren von Oberflächen der Brammen (1) nach dem Stranggießprozess,
    wobei nach dem Stranggießprozess und vor dem Konditionierprozess für die Brammen (1) ein Überprüfungsprozess für die Brammen (1) an den Brammen (1) durchgeführt wird, um Oberflächenschichtfehlerdaten (5A) für die Brammen (1) zu erfassen, welche Ausmaße und dreidimensionale Positionen von Oberflächenschichtfehlern in den Brammen (1) festlegen, und wobei in Bezug auf die erfassten Oberflächenschichtfehlerdaten für die Brammen (1) eine Bestimmung darüber vorgenommen wird, ob ein beliebiger Oberflächenschichtfehler, der auf der Grundlage von vorgegebenen Konditioniernormen (8) beseitigt werden muss, vorliegt oder nicht, woraufhin, wenn ein derartiger beliebiger Oberflächenschichtfehler, der beseitigt werden muss, vorliegt, der beliebige Oberflächenschichtfehler in dem Konditionierprozess für die Brammen (1) beseitigt wird; und
    wobei die Konditioniernormen (8) zusammengesetzt sind aus einem Schritt, in welchem die Oberflächenschichtfehlerdaten (5A) für die Brammen (1), welche die Ausmaße und die dreidimensionalen Positionen der Oberflächenschichtfehler in den Brammen (1) festlegen, mit Oberflächenfehlerdaten (6A) für die Bleche (7), welche Ausmaße und zweidimensionale Positionen der Oberflächenfehler in den Blechen (7) festlegen, die aus den Brammen (1) gewonnen wurden, verglichen und in Gegenüberstellung damit überprüft werden, und in welchem Merkmale der Oberflächenschichtfehler der Brammen (1), welche die Oberflächenfehler der Bleche (7) werden, extrahiert werden, und welcher wiederholt an den Brammen (1) durchgeführt wird, derart, dass der beliebige Oberflächenschichtfehler, der entsprechend dem Stahltyp und dem Prozess beseitigt werden muss, bestimmt und klassifiziert wird, so dass die Oberflächenschichtfehler angezeigt werden können.
  2. Verfahren zum Herstellen von Stahlbrammen nach Anspruch 1, wobei die Oberflächenschichtfehler beliebige aus der Gruppe umfassend Einschlüsse, Lunker und Risse sind.
  3. Konditioniersystem für Oberflächenschichtfehler von Brammen (1), wobei Brammen durch Ausführen eines Stranggießprozesses (2) geformt werden und einem Warmwalzprozess (21) und einem Kaltwalzprozess (22), um Bleche zu formen, unterzogen werden, wobei das Konditioniersystem dadurch gekennzeichnet ist, dass es:
    ein Mittel (12) zum Messen der Oberflächenschichtfehler der Brammen (1), ein Mittel (13) zum Messen von Oberflächenfehlern von Blechen (7), eine Datenbank (5C) der Oberfläcizenschichtfehler der Brammen (1), eine Datenbank (6C) der Oberflächenfehler der Bleche (7),
    eine Konditioniernormendatenbank (14), ein Berechnungsmittel (15) und ein Mittel (11) zum Konditionieren der Brammen (1) umfasst,
    wobei die Datenbank (5C) der Oberflächenschichtfehler der Brammen (1) Oberflächenschichtfehlerdaten (5A) für die Brammen (1) speichert, welche durch das Mittel (12) zum Messen der Oberflächenschichtfehler der Brammen (1) gemessen werden und welche Ausmaße und dreidimensionale Positionen der Oberflächenschichtfehler der Brammen (1) festlegen, derart, dass die Oberflächenschichtfehlerdaten (5A) für die Brammen (1) eingegeben und ausgegeben werden können,
    wobei die Datenbank (6C) der Oberflächenfehler der Bleche (7) Oberflächenfehlerdaten (6A) für die Bleche (7) speichert, welche durch das Mittel (13) zum Messen der Oberflächenfehler der Bleche (7) gemessen werden und welche Ausmaße und zweidimensionale Positionen der Oberflächenfehler der Bleche (7), die als Materialien aus den Brammen (1) gewonnen wurden, festlegen, derart, dass die Oberflächenfehlerdaten (6A) für die Bleche (7) eingegeben und ausgegeben werden kann,
    wobei die Konditioniernormendatenbank (14) erfasst wird, wenn ein Schritt, in welchem anhand des Berechnungsmittels (15) die Oberflächenschichtfehlerdaten für die Brammen (1), welche in der Datenbank (5C) der Oberflächenschichtfehler der Brammen (1) gespeichert sind, mit den Oberflächenfehlerdaten für die Bleche (7), welche in der Datenbank (6C) der Oberflächenfehler der Bleche (7), die als Materialien aus den Brammen (1) gewonnen werden, gespeichert sind, verglichen werden und in Gegenüberstellung miteinander überprüft werden, und in welchem Merkmale der Oberflächenschichtfehler der Brammen (1), welche die Oberflächenschichtfehler der Bleche (7) werden, extrahiert werden, wiederholt an den Brammen (1) durchgeführt wird, so dass jeder beliebige Oberflächenschichtfehler, der beseitigt werden muss, in der Konditioniernormendatenbank (14) gespeichert wird, um als Daten des zu bestimmenden, zu klassifizierenden und zu beseitigenden Oberflächenschichtfehlers eingegeben und ausgegeben werden zu können,
    wobei in Bezug auf jede beliebige Konditionierbramme das Mittel (12) zum Messen der Oberflächenschichtfehler der Brammen (1) den Oberflächenschichtfehler davon misst, um Oberflächenschichtfehlerdaten für die beliebige Konditionierbramme zu bilden; wobei anhand des Berechnungsmittels (15) die Oberflächenschichtfehlerdaten mit den Daten des Oberflächenschichtfehlers, der beseitigt werden muss, verglichen und in Gegenüberstellung damit überprüft werden, wobei die Daten des Oberflächenschichtfehlers, der beseitigt werden muss, aus der Konditioniernormendatenbank (14) ausgegeben werden; und wobei eine Bestimmung darüber vorgenommen wird, ob ein beliebiger Oberflächenschichtfehler, der in der beliebigen Konditionierbramme beseitigt werden muss, vorliegt oder nicht, so dass, wenn ein derartiger beliebiger Oberflächenschichtfehler, der beseitigt werden muss, in der Bramme (1) vorliegt, ein Signal, welches verwendet wird, um den beliebigen Oberflächenschichtfehler, der beseitigt werden muss, zu beseitigen, an das Mittel (11) zum Konditionieren der Brammen ausgegeben wird.
  4. Konditioniersystem für Oberflächenschichtfehler von Brammen nach Anspruch 3, wobei das Mittel (12) zum Messen der Oberflächenschichtfehler der Brammen (1) mindestens eine der folgenden Fehlermessvorrichtungen ist: eine Fehlermessvorrichtung vom Ultraschallreflexionstyp, eine Fehlermessvorrichtung vom transmittierenden Typ mittels Strahlung und eine Fehlermessvorrichtung vom magnetischen Streuflusstyp.
  5. Konditioniersystem für Oberflächenschichtfehler von Brammen nach entweder Anspruch 3 oder Anspruch 4, wobei das Mittel (13) zum Messen von Oberflächenfehlern von Blechen mindestens eine der folgenden Fehlermessvorrichtungen ist: eine auf kontinuierlicher Online-Fotografie und Bilddatenverarbeitung aufbauende Oberflächenfehlermessvorrichtung und eine Fehlermessvorrichtung vom magnetischen Streuflusstyp.
EP07737461.9A 2006-02-22 2007-02-21 Herstellungsverfahren für ein durchgehendes stahlformteil und system zur behandlung eines oberflächenfehlers des formteils Expired - Fee Related EP1980345B1 (de)

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JP2006044799A JP4816130B2 (ja) 2006-02-22 2006-02-22 鋼の連続鋳造鋳片の製造方法および鋳片の表層欠陥手入システム。
PCT/JP2007/053701 WO2007099977A1 (ja) 2006-02-22 2007-02-21 鋼の連続鋳造鋳片の製造方法および鋳片の表層欠陥手入システム

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CN101389428A (zh) 2009-03-18
JP2007222884A (ja) 2007-09-06
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