EP2595766B1 - Stranggies- und walzverfahren sowie anlage zur herstellung langer gewalzter metallprodukte - Google Patents

Stranggies- und walzverfahren sowie anlage zur herstellung langer gewalzter metallprodukte Download PDF

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EP2595766B1
EP2595766B1 EP11760547.7A EP11760547A EP2595766B1 EP 2595766 B1 EP2595766 B1 EP 2595766B1 EP 11760547 A EP11760547 A EP 11760547A EP 2595766 B1 EP2595766 B1 EP 2595766B1
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Prior art keywords
rolling
reduction
product
casting
rolling train
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French (fr)
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EP2595766A1 (de
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Gianpietro Benedetti
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Danieli and C Officine Meccaniche SpA
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Danieli and C Officine Meccaniche SpA
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    • 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
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • 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
    • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
    • 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
    • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/0805—Flat bars, i.e. having a substantially rectangular cross-section
    • 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
    • B21B1/463—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 in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B21B1/466—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 in a non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the present invention concerns a continuous casting and rolling method and plant, or line, in endless or semi-endless mode, to make high productivity long rolled metal products such as bars, rod, girders, rails or shapes in general.
  • Plants known in the state of the art for the production of long rolled products provide a casting machine and a rolling train, which is disposed in line and downstream of the casting machine. It is also known that in solutions in which the casting axis defined by the casting machine and the rolling axis defined by the rolling train coincide, the plant can be configured and used in endless mode (that is, without a break in continuity), or in semi-endless mode (that is, starting from segments of the cast product sheared to size).
  • One purpose of the present invention is to make a high productivity casting and continuous rolling in line process which can work both in endless and semi-endless mode, and to perfect a relative production plant which allows to manage the stoppages of the rolling train, substantially without interrupting the casting and therefore without loss in production and without penalizing the steelworks upstream.
  • Another purpose of the invention is to reduce to a minimum or eliminate waste material in emergency situations or during the programmed stoppages and in any case to completely recover the product which in such situations is temporarily accumulated in an intermediate point along the production line.
  • a further purpose of the invention is to exploit to the full the enthalpy of the original liquid steel along the whole production line so as to obtain a considerable saving in energy and a reduction in working costs compared to conventional processes.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a casting and rolling plant for the production of long rolled products comprises a single continuous casting machine and a rolling train disposed downstream and in line with the casting machine.
  • a hypothetical casting axis of the casting machine substantially coincides with a hypothetical rolling axis of the rolled products, so that this configuration is suitable to obtain a continuous process of the endless type; in any case it is always possible to also make a continuous process of the semi-endless type.
  • the casting machine has a crystallizer suitable to cast liquid steel at high speed and high productivity (for example, but only indicatively, from 35 to 200 ton/h).
  • high speed casting we mean that the continuous casting machine can cast products, in relation to thickness, at a speed variable from about 3 to about 9 m/min.
  • the crystallizer produces a substantially rectangular section, hereafter defined in general as bloom, in which the ratio between long side and short side is comprised between 1.02 and 4, that is, just higher than the square section up to a rectangular section in which the long side is up to 4 times longer than the short side.
  • the section of the cast product is not limited to the quadrangular with straight sides, parallel two by two, but also comprises sections with at least a curved, concave or convex side, advantageously but not necessarily two by two opposite and specular, or combinations of the said geometries.
  • the rectangular sections cast have sizes of about 100 mm x 140 mm, 130 mm x 180 mm,130 mm x 210 mm, 140 mm x 190 mm, 160 mm x 210 mm, 160 mm x 280 mm, 180 mm x 300 mm, 200 mm x 320 mm or intermediate sizes.
  • bigger sections can also be used, for example about 300 mm x 400 mm and similar.
  • the cast section has a surface equal to that of a square with equivalent sides comprised between 100 to 300 mm.
  • the rolling train advantageously comprises from 3 to 4 rolling stands up to 15 or 18 rolling stands in relation to the type of final product to be obtained, to the thickness of the cast product, to the casting speed or other parameters.
  • the line provides an additional rolling unit, consisting of at least a stand, advantageously from 1 to 4 stands, in order to return the rectangle to a square, round or oval shape or in any case less wide, suitable for the rolling train.
  • the additional rolling unit in a first solution, is placed immediately downstream of the casting machine, while in another solution it is placed immediately upstream of the rolling train.
  • the positioning along the line of the additional rolling unit conditions, as will be explained hereinafter, both the lay-out configuration and the rolling process modes which are performed.
  • the casting and rolling line also comprises, downstream from the continuous casting, at least shears for shearing the blooms to size, into segments of desired length in semi-endless mode or in the event of an emergency in endless mode.
  • desired lengths of the segments we mean a value comprised between 12 and 80 meters.
  • the shears can carry out the emergency scrapping of the material coming from casting.
  • a maintenance and/or possible heating unit downstream of the casting machine which comprises a tunnel furnace configured to act, as well as a heating and/or temperature maintenance chamber, also as a possible store for accumulating the blooms in the case of a temporary interruption of the rolling train, for example to allow programmed maintenance programs or channel changes or changes in production, or due to accidents.
  • the casting machine does not necessarily have to be stopped, but only slowed down, at least for a predetermined period of time, the so-called "buffer-time", because the product exiting therefrom, sequentially sheared into blooms of a predefined length, is accumulated inside the furnace and is maintained there at a working temperature, thus releasing it from the rolling train which is stopped. The blooms, accumulated and maintained at temperature, are then fed again toward the rolling train, once this is working again.
  • the maintenance and/or possible heating unit can also perform the function of restoring the temperature of the blooms in transit and/or stopped inside it.
  • the minimum length of the maintenance and/or possible heating unit is advantageously determined as a function of the buffer time, as a function of the casting speed, lower than the value of the normal speed in an emergency condition, and as a function of the rolling speed of the rolling line placed downstream.
  • the maintenance and/or possible heating unit can provide to heat the blooms to suitable values for rolling, restoring the loss of temperature caused by the rolling step in the additional reduction unit.
  • a rapid heating device can be provided, advantageously one or more inductor furnaces, downstream of the additional rolling unit and upstream of the rolling train, in this case too with the function of restoring the temperature of the blooms, bringing it to a suitable value for rolling, and therefore of recovering the loss of temperature due to the rolling pass in the additional reduction unit.
  • the inductor furnace may be present, or also present, in an intermediate position between the stands of the rolling train, for example after the first stand and/or after the second stand up to the tenth if the number of stands is comprised between ten and eighteen.
  • the intermediate disposition of the inductor furnace between the stands of the rolling train allows to roll the product at a more balanced and uniform temperature along the rolling train, and therefore a reduction in power, less wear on the rolling channels etc.
  • the inductor furnace can be advantageously used in said positions in order to recover the considerable heat dispersions due substantially to the low rolling speeds which must be maintained, above all in the first rolling stands of the train.
  • the inductor furnace allows, by its action, to obtain a more uniform heating of the blooms, in particular to also heat the edges, thus avoiding the formation of cracks in these zones during rolling.
  • fig. 1 shows a first example of a layout 10 of a plant for the production of long rolled products according to the present invention.
  • the layout 10 in fig. 1 comprises, in its essential elements shown, a continuous casting machine 11 with a single line which uses a crystallizer, or other suitable device to cast blooms of various sizes and rectangular shape with straight, curved, concave or convex sides, or other shape.
  • Some examples of sections that can be cast in the context of the present invention are shown in figs. 4-7 , which respectively show a rectangular section with straight and parallel sides ( fig. 4 ), a section with short sides with a convex curve and long, straight parallel sides ( fig. 5 ), a section with short sides with a concave curve at the center and long, straight parallel sides ( fig. 6 ), and a section with short sides with a concave curve and long, straight parallel sides ( fig. 7 ).
  • the continuous casting machine 11 is disposed on a line coincident with the rolling line defined by a rolling train 16 placed downstream. In this way it is possible to realize an endless process, that is without a break in continuity. A semi-endless process can also be realized.
  • the continuous casting machine 11 has high productivity, being able to reach casting speeds comprised between 3 and 9 m/min, depending on the type of product (section, quality of steel, final product to be obtained etc.), and casting sections with one size predominant over the other, in a ratio preferably comprised between 1.02 and 4.
  • the casting machine 11 allows to obtain a variable productivity from 35 ton/h to 200 ton/h.
  • the cast blooms have sizes of about 100 mm x 140 mm, 130 mm x 180 mm,130 x 210 mm, 140 mm x 190 mm, 160 mm x 210 mm, 160 mm x 280 mm, 180 mm x 300 mm, 200 mm x 320 mm or intermediate sizes.
  • bigger sections can also be used, for example about 300 mm x 400 mm and similar.
  • the cast section has a surface equal to that of a square with equivalent sides comprised between 100 and 300 mm.
  • shears 12 Downstream of the continuous casting machine 11 there are shears 12 to shear to size, which can cut the blooms cast into segments of desired length, both for the semi-endless mode functioning of the plant 10, and for the endless mode functioning when the rolling train 16 is stopped.
  • the shears 12 can also carry out the emergency scrapping of the material coming from casting.
  • an additional reduction/roughing unit 13 present in the line, generally consisting of from 1 to 4 rolling stands, and, in this case, of 3 alternate vertical/horizontal/vertical rolling stands or in other forms of embodiment vertical-vertical-horizontal or other combinations. It is also possible to use a single vertical rolling stand.
  • the stands are used for bringing the rectangular cast section to a square, round, oval or in any case, less wide shape than the starting shape, in order to make it suitable for rolling in the rolling train 16 placed downstream. It is understood that the number of rolling stands can be selected between 1 and 4, depending on the overall design parameters of the line and the products to be continually cast.
  • the best positioning of the additional reduction/roughing unit 13 along the line comprised from end of casting to start of rolling train 16 is established in relation to the speed which can be obtained at the entrance to the first stand of the unit. For example, if the speed is comprised between 3 and 4.8 m/min (0.05 m/s and 0.08 m/s), the reduction/roughing unit 13 is positioned immediately downstream of the continuous casting machine 11 and upstream of the cutting to size shears 12 ( fig. 1 ), while if the entrance speed to the stand is greater, for example comprised between 5 and 9 m/min, the additional reduction/roughing unit 13 is placed at the head of the rolling train 16 and downstream of the maintenance and/or possible heating furnace 14 ( fig. 2 ), as will be shown hereafter.
  • the speed is comprised between 3 and 4.8 m/min (0.05 m/s and 0.08 m/s)
  • the reduction/roughing unit 13 is positioned immediately downstream of the continuous casting machine 11 and upstream of the cutting to size shears 12 ( fig.
  • Another parameter that can condition the choice of inserting the additional reduction/roughing unit 13 immediately downstream of the continuous casting machine 11 and upstream of the shears 12 is the energy factor.
  • a maintenance and/or possible heating tunnel furnace 14 of the horizontal type is disposed downstream of the continuous casting machine 11 . More precisely the tunnel furnace 14 is disposed along the continuous casting line and along the rolling line which are defined respectively by the continuous casting machine 11 and the rolling train 16.
  • the furnace tunnel 14 can act as a heating element, for example, in cases where the reduction/roughing unit 13 is placed immediately downstream of the continuous casting machine 11, in order to bring the temperature of the bloom to a value suitable for the subsequent rolling, or to restore the loss of temperature deriving from the passage through the reduction/roughing unit 13 when this is located between the continuous casting machine 11 and the shears 12.
  • the furnace tunnel 14 can also carry out the function of maintenance chamber, maintaining the temperature of the blooms, between entrance and exit, between about 900°C and about 1,100°C, for example when the reduction/roughing unit 13 is not provided immediately downstream of the continuous casting machine 11, but upstream of the rolling train 16.
  • the furnace tunnel 14 can also act as a store to accumulate the blooms, in particular in the event of an interruption in the functioning of the rolling train 16 because of accidents or programmed roll change or change in production.
  • the length of the tunnel furnace 14 is determined depending on the accumulation time of the blooms, or buffer time, which is required so that the stoppage of the continuous casting machine 11 is not necessary.
  • the continuous casting machine in an emergency condition, is made to work at a reduced casting speed compared with normal working speed.
  • the time needed to fill the tunnel furnace in this emergency condition, or with a reduced casting speed, is the buffer time.
  • LFT BT / 1 / VE ⁇ 1 / VL in which VL is the rolling speed of the rolling line (in m/min) when the rolling line is working under normal conditions, VE is the reduced casting speed compared with the normal working speed VL (in m/min) in an emergency condition, BT is buffer time (in minutes), that is, the maximum time in which the continuous casting machine 11 in a condition of reduced casting time VE fills the tunnel furnace 14 because of a stoppage of the rolling train 16, and LFT is thus the minimum length of the tunnel furnace (in meters).
  • a table and a graph are respectively shown in which the minimum lengths of the tunnel furnace 14 are shown for some casting speeds VE and for a rolling speed VL equal to 6m/min, depending on the three examples (10 min, 20 min and 30 min) of buffer time which may be required in situations relating to a casting and rolling cycle.
  • an inductor furnace 15 is provided having the function of bringing the temperature of the blooms exiting from the unit 13 to suitable values for rolling.
  • the inductor furnace 15 provides to restore the temperature to a value higher than about 1,000°C, whereas when the blooms exit from the unit 13 at a temperature comprised between about 1,050 and about 1,080°C, then it is not necessary to provide the functioning of the inductor furnace 15 at exit from the tunnel furnace 14, which can be kept switched off.
  • the number of rolling stands 17 used in the rolling train 16 is variable from 3-4 to 15-18 and more, depending on the type of final product to be obtained, on the thickness of the product cast, on the casting speed and on other parameters.
  • the inductor furnace 15 is installed in an intermediate position between the rolling stands 17 of the rolling train 16, in this case after the fourth rolling stand, event if, in other forms of embodiment, it is possible to provide that it is disposed, for example, after the first and/or after the second rolling stand 17 as far as the tenth, when there are 15 or 18 rolling stands.
  • the intermediate disposition, between the stands of the rolling train 16, of the inductor furnace 15 allows to roll at more balanced and uniform temperatures along the rolling train 16 and therefore with less power, less wear on the rolling channels etc.
  • the inductor furnace 15 can be advantageously used in the aforesaid positions in order to recover the considerable heat dispersions substantially due to the low rolling speeds which must be maintained above all in the first rolling stands of the train.
  • cropping shears 18 present upstream of the rolling train 16 ( fig. 1 ), hydraulic shears for example, which as well as cropping the head end of the bloom before it enters the rolling train 16 and/or the additional reduction unit 13, can also carry out emergency scrapping.

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Claims (11)

  1. Verfahren zur Herstellung von langen Metallwalzprodukten in einer Anlage umfassend zumindest eine Stranggussanlage (11), einen Halte- und/oder Aufheiz-Tunnelofen (14) und eine Walzstraße (16), umfassend die folgenden Schritte:
    - Hochproduktivitäts-Stranggießen, ausgeführt durch eine einzige Stranggussanlage (11), Definieren einer Gießachse eines rechteckigen Querschnittsprodukts mit einem Verhältnis zwischen der langen Seite und der kurzen Seite zwischen 1,02 und 4;
    - erste Querschnittsreduktion in einer zusätzlichen Reduktions-/Vorwalzeinheit (13), die stromaufwärts der Walzstraße (16) angeordnet ist und die Funktion aufweist, den am Eingang rechteckigen Querschnitt des Produktes in eine quadratische, runde, ovale oder in jedem Fall weniger breite Form am Ausgang zu bringen;
    - zweite Querschnittsreduktion in der Walzstraße (16), die eine Walzachse definiert, die im Wesentlichen mit der Gießachse übereinstimmt;
    - wobei die Stranggussanlage (11) mit einer Gießgeschwindigkeit zwischen 3 und 9 m/min und einer Stundenproduktivität zwischen 35 t/h und 200 t/h arbeitet, und wobei die minimale Länge LFT des Tunnelofens (14) bestimmt wird als eine inverse Funktion der Differenz zwischen der Walzgeschwindigkeit VL und der programmierten Gussgeschwindigkeit VE, die bezogen auf die normale Betriebsgeschwindigkeit in einer Notfallsituation reduziert wird, als eine direkte Funktion des Produkts der Walzgeschwindigkeit VL und der programmierten Gießgeschwindigkeit VE und als eine direkte Funktion der gewünschten Akkumulationszeit BT im Fall eines Stoppens der Walzstraße (16) gemäß der folgenden Formel: LFT = BT / 1 / VE − 1 / VL .
    Figure imgb0002
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die erste Querschnittsreduktion in der Reduktions-/Vorwalzeinheit (13) unmittelbar stromabwärts der Stranggussanlage (11) durchgeführt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die erste Querschnittsreduktion in der Reduktions-/Vorwalzeinheit (13) stromabwärts des Halte- und/oder Aufheiz-Tunnelofens (14) und stromaufwärts von der Walzstraße (16) durchgeführt wird.
  4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass es einen Schritt der Produktaufheizung bereitstellt, der in dem Halte- und/oder Aufheiz-Tunnelofen (14) durchgeführt wird, um so zumindest einen Teil des durch den Durchlauf des Produktes in der Reduktions-/Vorwalzeinheit (13) bedingten Temperaturverlustes wieder auszugleichen.
  5. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass es einen Schritt der Aufheizung des Gießprodukts bereitstellt, der in einer Schnellaufheizeinheit wie einem Induktionsofen (15) durchgeführt wird, der zwischen der Reduktions-/Vorwalzeinheit (13) und der Walzstraße (16) angeordnet ist, um so zumindest einen Teil des durch den Durchlauf des Produktes in der Reduktions-/Vorwalzeinheit (13) bedingten Temperaturverlustes wieder auszugleichen.
  6. Verfahren nach Anspruch 1 oder 2 oder 3, dadurch gekennzeichnet, dass es einen Schritt zum Aufheizen des Gießproduktes bereitstellt, der in einer Schnellaufheizeinheit wie einem Induktionsofen (15) durchgeführt wird, der an einer Zwischenposition zwischen den Gerüsten (17) der Walzstraße (16) angeordnet ist, wobei die Anzahl der Gerüste (17) der Walzstraße (16) zwischen drei und achtzehn beträgt, und wobei der Induktionsofen (15) abhängig von der Anzahl der Gerüste (17) nach dem ersten Durchgang und/oder nach einem der Durchgänge von zweitem bis zehntem Durchgang durch die besagten Gerüste (17) angeordnet ist, um so mit ausgeglicheneren Temperaturen zu walzen und/oder runde Querschnitte mit einem Durchmesser von ungefähr 5 mm bis zu 20 mm zu walzen.
  7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es auch zumindest einen selektiven Scherschritt umfasst, bei welchem das Gießprodukt auf Maß geschert wird, um Produktsegmente zu definieren, die akkumuliert und, im Fall von Notfallunterbrechungen oder Betriebsunterbrechungen der Walzstraße (16), innerhalb des Halte- und/oder Aufheiz-Tunnelofens (14) auf Temperatur gehalten werden.
  8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Querschnitt des Gießproduktes eine Oberfläche aufweist, die einem Quadrat mit gleichen Seiten von 100-300 mm entspricht.
  9. Gieß-und Walzanlage zur Herstellung von langen Metallwalzprodukten, umfassend zumindest eine Stranggussanlage (11), einen Halte- und/oder Aufheiz-Tunnelofen (14) und eine Walzstraße (16), wobei:
    die Stranggussanlage (11) eine einzelne Anlage aufweist, die eine Gießachse definiert, und die in der Lage ist, ein Produkt mit einem rechteckigen Querschnitt oder äquivalent mit einem Verhältnis zwischen der langen Seite und der kurzen Seite zwischen 1,02 und 4 zu gießen;
    die Walzstraße (16) eine Walzachse definiert, die im Wesentlichen mit der Gießachse übereinstimmt;
    eine zusätzliche Reduktions-/Vorwalzeinheit (13) mit zwischen einem und vier Gerüsten vorhanden ist, die ausgelegt ist, den am Eingang rechteckigen Querschnitt des Produktes in eine quadratische, runde, ovale oder in jedem Fall weniger breite Form am Ausgang zu bringen, wobei die minimale Länge LFT des Tunnelofens (14) eine inverse Funktion der Differenz zwischen der Walzgeschwindigkeit VL und der programmierten Geschwindigkeit VE, die bezogen auf die normale Betriebsgeschwindigkeit in einer Notfallsituation reduziert wird, eine direkte Funktion des Produktes der Walzgeschwindigkeit VL und der programmierten Gießgeschwindigkeit VE und eine direkte Funktion der gewünschten Akkumulationszeit BT im Fall eines Stoppens der Walzstraße (16) entsprechend der folgenden Formel: LFT - BT/(1/VE - 1/VL) ist.
  10. Gieß- und Walzanlage nach Anspruch 9, dadurch gekennzeichnet, dass die Reduktions-/Vorwalzeinheit (13) unmittelbar stromabwärts der Stranggussanlage (11) angeordnet ist.
  11. Gieß- und Walzanlage nach Anspruch 9, dadurch gekennzeichnet, dass die Reduktions-/Vorwalzeinheit (13) stromabwärts des Halte- und/oder Aufheiz-Tunnelofens (14) angeordnet ist, wobei zumindest eine Schnellaufheizeinheit (15) zwischen der Reduktions-/Vorwalzeinheit (13) und der Walzstraße (16) vorhanden ist, um zumindest einen Teil des durch den Durchlauf des langen Produktes in der Reduktions-/Vorwalzeinheit (13) bedingten Temperaturverlustes wieder auszugleichen.
EP11760547.7A 2010-07-21 2011-07-20 Stranggies- und walzverfahren sowie anlage zur herstellung langer gewalzter metallprodukte Active EP2595766B1 (de)

Applications Claiming Priority (2)

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ITUD2010A000147A IT1402237B1 (it) 2010-07-21 2010-07-21 Procedimento e linea di colata e laminazione continua per realizzare prodotti laminati metallici lunghi
PCT/IB2011/001694 WO2012010956A1 (en) 2010-07-21 2011-07-20 Continuous casting and rolling method and line to make long rolled metal products

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ITUD20100147A1 (it) 2012-01-22
EP2595766A1 (de) 2013-05-29
IT1402237B1 (it) 2013-08-28

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