EP3291933B1 - Installation de coulée et de laminage et procédé pour la faire fonctionner - Google Patents

Installation de coulée et de laminage et procédé pour la faire fonctionner Download PDF

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Publication number
EP3291933B1
EP3291933B1 EP16720393.4A EP16720393A EP3291933B1 EP 3291933 B1 EP3291933 B1 EP 3291933B1 EP 16720393 A EP16720393 A EP 16720393A EP 3291933 B1 EP3291933 B1 EP 3291933B1
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EP
European Patent Office
Prior art keywords
casting
strip
installation according
rolling installation
rolling
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EP16720393.4A
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German (de)
English (en)
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EP3291933A1 (fr
Inventor
Uwe Plociennik
Thomas Heimann
Christoph Tischner
Markus Reifferscheid
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SMS Group GmbH
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SMS Group GmbH
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • 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
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/142—Plants for continuous casting for curved casting

Definitions

  • the invention relates to a casting-rolling plant for small-scale annual production of metal strips, wherein the metal strip passes through the casting-rolling plant in a conveying direction, comprising a casting machine with a vertical outlet mold for producing a cast strand and one of the mold in the conveying direction downstream strand guide for deflecting the casting strand from the vertical to the horizontal, one of the strand guide in the conveying direction downstream connection system comprising at least one straightening device for pulling the casting strand from the strand guide and a separator, in particular scissors, and a furnace for heating the casting strand and a downstream of the connection system in the conveying direction rolling mill for rolling the casting strand to the metal strip. Furthermore, the invention relates to a method for operating such a casting-rolling plant.
  • a casting-rolling plant of the generic type is known from EP 0 846 508 A1 and from the EP 0 535 368 B1 known. Similar and other solutions reveal the EP 0 099 076 B1 , the EP 2 571 640 B1 , the WO 2013/113832 A1 , the DE 10 2010 022 003 A1 , the AT 292 937 B , the CH 595 165 A5 , the DE 12 33 542 B and the CH 407 422 A ,
  • So-called CSP plants are built and operated in conventional embodiments as Vertical Solid Bending (VSB) plants or as Vertical Liquid Bending (VLB) plants. Such plant types are designed for productions of more than 1 million tons per year.
  • VSB Vertical Solid Bending
  • VLB Vertical Liquid Bending
  • the invention is therefore the object of developing a generic casting-rolling device so that the functionality of the system can be increased, in particular, it should be possible to produce high quality metal strip at low investment and operating costs.
  • the solution of this object by the invention is characterized in that the strand guide has a single or two roller segments, wherein the rollers provided for strand guidance are free of a drive.
  • connection system between steel mill and rolling mill is designed in particular such that the strand at the kiln inlet has a sufficiently high average temperature for the subsequent rolling operation.
  • the furnace in normal casting operation no longer needs to heat the strand for the subsequent rolling mill or only in exceptional need.
  • roller segments In the presence of two roller segments in the strand guide these are preferably formed substantially identical.
  • the strand guide is preferably designed to bend the cast strand so that it has a minimum radius of curvature of 2100 mm.
  • the strand guide preferably has the shape of a clothoid, at least in sections.
  • the mold is preferably formed vertically or as a curved mold.
  • the length of the mold is preferably at most 1100 mm, more preferably between 900 mm and 1000 mm.
  • the height of the strand guide without mold preferably has a maximum height of 3 m.
  • connection system preferably has a separating device, in particular a pair of scissors, which is arranged between the directional driver and the oven.
  • the straightening unit and the scissors are constructed constructively as "straightening shears".
  • the oven therefore advantageously has a minimized length.
  • the length consists of the slab length, the acceleration length and the additional heating length to compensate for the heat losses.
  • connection system furthermore has a cold-string delivery unit, preferably a cold-rod rocker, with integrated insulation.
  • the strand guide preferably ends before the tangent point; this is preferred for low production to obtain a minimum energy requirement.
  • the strand guidance can also end in or behind the tangent point. This is advantageous in higher productions.
  • the straightening and driving unit preferably has driven rollers on the top and bottom of the slab. This is advantageous because of the doubling of the withdrawal forces.
  • the oven is preferably shorter than 100 m.
  • the furnace has, according to one embodiment, at least one inductive heating element. Furthermore, can be provided that the furnace at least one heat hood upstream or downstream in the conveying direction.
  • the heating unit is thus specially adapted to the requirements of the short casting machine. It preferably consists of a short furnace (less than 100 m, for example also 60 m with a band length of 50 m) or, alternatively, an inductive heating with a subsequent passive heat hood.
  • the cold strand can be carried away between separator and oven upwards. In casting this room is protected by a sliding heat hood against heat loss. For discharging the cold strand this heat hood is pushed over the adjoining oven.
  • the method for operating such a casting-rolling plant is carried out according to the invention in that the casting strand cast in the casting machine is fed into the rolling mill without further heating in the furnace and rolled therein.
  • the cast casting strand is cooled in the strand guide so that it is completely solidified when reaching the straightening driver.
  • the cast casting strand is cooled in the strand guide so that it is completely solidified 500 mm to 10 mm (target interval) in the conveying direction before the last roll of the strand guide.
  • This approach is particularly advantageous in terms of low investment and operating costs.
  • the sump tip is thus selectively placed in the target interval, which is done by controlling the casting speed and / or the cooling volume flows.
  • the segments of the strand guide can be changed to increase the radius of curvature, which is advantageous for crack-sensitive steels or larger thicknesses.
  • a simple extension of the Micro-CSP system on higher quality steels or higher production is possible.
  • the oven inlet temperature is preferably greater than 1050 ° C. Due to the short casting machine and the compact design of the connection system, the strand is optimally prepared at this furnace inlet temperature so that it does not have to be further heated in the furnace for the subsequent rolling mill.
  • Carbon steels with low and average carbon contents are preferably processed.
  • the dimensions are preferably between 40 and 60 mm, preferably between 45 and 55 mm; but also other steels with comparable dimensions are preferably processed.
  • the invention thus relates to the linking of a steelworks with a rolling mill by a small casting machine (micro-casting machine) and a connection system.
  • the compact design of the casting machine with the connection system realizes a low capital expenditure with low operating costs. This is achieved through components of small dimensions and short distances. Additionally, for low cost production conditions, a high exit temperature of the cast strand is required at the end of the caster. Due to the compact design according to the invention, little energy is lost, so that energy must be supplied in the subsequent furnace system only in special production conditions.
  • the invention provides a link between steel mill and rolling mill by the inclusion of a suitable casting machine with connection system as key components.
  • the link provides the essential components ladle turret, distributor, casting machine with mold, straightening unit, shears, Kaltstrangaus makesystem and furnace systems.
  • Key component is a casting machine with short strand guide and a small distance to the furnace.
  • connection system the components behind the caster - such as straightening unit, scissors, Kaltstrangaus proportional system and furnace systems - are addressed as a connection system.
  • Fig. 1 is a casting-rolling plant 1 for the production of a metal strip 2 can be seen.
  • the plant has a casting machine 3, in which liquid metal emerges from a mold 14 vertically downwards and is deflected along a strand guide 4 from the vertical in the direction of the horizontal.
  • the material of the belt or the belt itself is conveyed in a conveying direction F through the system 1.
  • the plant 1 also has a rolling mill 8. Between the casting machine 3 and the rolling mill 8, a connection system 5 is arranged.
  • the connection system 5 comprises a straightening driver 6, a subsequent separating device, preferably a pair of scissors 9, and an oven 7; Furthermore, a cold-strand rocker 10 is present.
  • the strand guide 4 has a single roller segment or only two roller segments, with their rollers provided for strand guidance free are from a drive. Rather, the cast metal strip is pulled out of the casting machine 3 by the straightening device 6.
  • pans with smaller volumes and therefore compact ladle turrets and distributors can be used. Due to the small pan sizes, a rigid ladle turret can be used.
  • pan transport via ladle is possible;
  • Another alternative possibility consists of fixed, preferably two, parking spaces for the pans and in a transport by means of a steelwork crane.
  • shortened funnel coasters can be used, whose length is between 900 and 1100 mm, depending on the preferred casting speed. If necessary, the mold can be built even shorter. This saves investment and operating costs at the same time.
  • the following is of importance: According to the present problem of low production in conjunction with the compact design of the mold and the strand guide according to the invention, a casting machine 3 which is shorter than conventional advantageously results.
  • the strand guide 4 ends in the arc of the strand guide in front of the straightening device 6.
  • the solidification of the strand takes place before the straightening 6, ie within the strand guide 4. This is necessary because otherwise the necessary extraction forces for transporting the strand can not be transferred.
  • the average temperature of the strand at the end of the strand guide must be as high as possible his. This is achieved by the smallest possible distance of Enderstarrungsposition to the last role of the strand guide and by the most balanced temperature profile in the strand.
  • a final solidification in the range of 10 mm to 500 mm, the target interval should be aimed at before the last roll of the strand guide.
  • the swamp tip must be within the specified target interval in order to keep the kiln length short. This is achieved by regulating the casting speed and / or the cooling volume flows.
  • the design of the hopper mold - vertical or curved - has an influence on the design of the upper part of the strand guide.
  • the mold Possible designs of the mold are the vertical mold, d. H. the strand guide begins perpendicular or with a large radius of curvature (clothoids). Furthermore possible is a bent mold, d. H. the strand guide has a same radius of curvature or a decreasing radius of curvature.
  • the radius of curvature of the strand guide starting from the radius present at the mold outlet, preferably up to the minimum radius of curvature (see Fig. 2 ) decreased. Then there is the possibility to increase the radius of curvature to the end of the strand guide again, such. B. in the double clothoid.
  • the minimum radius of curvature in the strand guide depends on the material and the strand thickness. It depends on the maximum allowable elongation of the outer fiber of the curved strand. For this purpose, refer to the illustration in Fig. 2 directed.
  • larger strand thicknesses can be cast for larger radii of curvature in the strand guide.
  • the design of the strand guide is determined by the production or casting speed, the largest strand thickness to be cast and the material to be cast.
  • the strand guide 4 ends at or after the tangent point T; this situation is in the FIGS. 4 and 5 shown.
  • a curve of the radii of curvature can be used in the form of a double clothoid.
  • strand guide 4 For small designs, it is advisable to create the strand guide 4 from only a single segment (plus straightening unit or straightening driver). For larger designs, however, two segments are provided. In Fig. 6 these two possibilities are illustrated.
  • Fig. 7 is the respectively preferred arrangement of strand guide 4 and straightening 6 depending on the production volume and with respect to the tangent point T shown.
  • the distance between the last supported roll and the straightening unit must be as small as possible. Cost-reducing is that the strand guide 4 has no driven rollers. In addition, the structurally required distance between the last role and the straightening unit can be secured by insulation and radiation protection components against energy losses.
  • the strand guide must be designed with the specified system height and the position of the straightening driver. This can be achieved with the help of an already curved hopper mold and a modified strand guide.
  • the straightening device 6 and the separating device can be configured as a straightening-scissors-unit 11 (see Fig. 8 ).
  • the straightening and driving unit and the segments can preferably be changed separately, so that the straightening and driving unit does not have to be changed with the segment change.
  • the straightening and driving unit 6 consists of at least two roller pairs with drive for transmitting the forces for strand transport. To double the pull-out forces, the rollers are driven on the top and bottom.
  • straightening drivers and scissors can be combined as a compact unit 11 (as a "straightener") (s. Fig. 8 ).
  • the "straightener” can be performed with a driven straightening roller in front of the scissors and a straightening roller behind the scissors. Due to the then higher strand temperatures, the shear requires a lower shear force. This allows the scissors and their drive to be built smaller and more compact.
  • the scissors 9 can be protected against the thermal radiation of the high surface temperatures of the strand by insulation and radiation protection components.
  • the proposed system furthermore has a cold-extruded discharge unit, preferably a cold-extruded rocker 10 (see, for this, the FIGS. 9 and 10 ).
  • the cold-strand threading unit may be located between the directional control unit 6 and the scissors 9 or preferably after the scissors 9.
  • this area must be as short as possible in order to lose as little energy as possible. All free routes can be covered by insulation and radiation protection components.
  • the cold strand can be transported via a rocker 10 above the furnace 7 and deposited there.
  • the rocker 10 is then constructed so that it lies in the normal casting above the furnace 7 (see Fig. 9 ).
  • Your over the oven 7 in the direction of casting machine 3 extending length is protected downwards by insulation and radiation protection components.
  • These insulations serve firstly to protect the rocker 10 against the high temperature of the strand, and secondly to reduce the energy losses of the strand.
  • On the side walls of the rocker 10 more insulation and radiation protection components are present, which extend into the vicinity of the hall floor.
  • the space between the scissors 9 and 7 furnace is formed into a kind of heat hood: this allows a passive extension of the furnace. 7
  • the cold strand 12 is conveyed away between the scissors 9 and the kiln inlet to the hall ceiling. Also in this embodiment, the distance between scissors 9 and kiln inlet is after the entry and removal of the cold strand 12 to protect against energy loss.
  • protection for adjacent mechanical or electrical equipment such. As the scissors 9, to install against the high thermal radiation of the furnace.
  • non-cooled rolls can be used, preferably furnace rolls. They remove less energy from the strand underside during roller contact.
  • the furnace system can be heated with fossil fuels or electrically, in particular inductively. There are also combinations of both variants possible. Alternatively, an inductive heating with subsequent passive heat hood can be used to compensate for the temperature profile, or only a passive heat hood.
  • the furnace must be at least long enough for a slab to fit all the way in and then be accelerated to the required rolling speed (about 18 m / min) from the incoming casting speed, preferably 4 to 5 m / min. For a slab length of approx. 50 m, a 60 m long stove is sufficient.
  • the acceleration length is the length in order to accelerate the slab from the casting speed to the rolling speed.
  • the minimum furnace length is the slab length plus the acceleration length.
  • this minimum furnace length may need to be extended (see below for roll change times).
  • furnace length additionally required for heating: additionally required oven length ⁇ 28 * d swamp + 5 * d distance + 2 * d AbstandIso
  • the strand or the slab is to be protected against energy losses by means of insulation or radiation protection components.
  • the oven can be made shorter (lower investment costs).
  • the strand or the slab does not have to be actively or less heated (lower operating costs).
  • roller change times the following should be noted: In the rolling process, the rollers wear and must, depending on productivity and roll material, for. B. be changed every five hours. The aim is to perform this roll change without casting break, since the risk of breakthrough increases when re-casting and units should be replaced prematurely.
  • the cooling in the casting machine is reduced according to the casting speed. If the slab nevertheless becomes so cold that it can no longer be brought to the required rolling temperature in the oven, it must be chopped with scissors.
  • the required roll change times are a criterion for determining the required furnace length.
  • the casting speed and the temperature control in the casting machine can be optimized so that the maximum possible strand temperatures are achieved. This reduces the energy consumption in the oven and reduces operating costs.
  • Fig. 13 For this purpose, a flow chart for process control during roll change is shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)

Claims (21)

  1. Installation de coulée-laminage (1) pour la fabrication de bandes métalliques (2), dans laquelle la bande métallique (2) s'étend à travers l'installation de coulée-laminage (1) dans une direction de transport (F), comprenant :
    une machine de coulée (3) comprenant une lingotière équipée d'une sortie verticale pour l'obtention d'une barre de coulée et un guidage de barre (4) monté à la suite de la lingotière dans la direction de transport (F), pour soumettre la barre de coulée à une déviation depuis la verticale jusqu'à l'horizontale;
    un système de raccordement (5) monté à la suite du guidage de barre (4) dans la direction de transport (F), qui comprend au moins un mécanisme de dressage et d'extraction (6) pour la récupération de la barre de coulée par traction à partir du guidage de barre (4) et un dispositif de séparation (9), en particulier une cisaille, de même qu'un four (7) pour le réchauffement de la barre de coulée ; et
    un laminoir (8) monté à la suite du système de raccordement (5) dans la direction de transport (F), destiné au laminage de la barre de coulée pour obtenir une bande métallique (2) ;
    caractérisée en ce que le guidage de barre (4) présente un segment unique ou deux segments de rouleaux ; dans laquelle les rouleaux prévus pour le guidage de barre sont exempts d'un entraînement.
  2. Installation de coulée-laminage selon la revendication 1, caractérisée en ce qu'en présence de deux segments de rouleaux dans le guidage de barre (4), ceux-ci sont réalisés avec une structure essentiellement identique.
  3. Installation de coulée-laminage selon la revendication 1 ou 2, caractérisée en ce que le guidage de barre (4) est conçu pour le cintrage de la barre de coulée d'une manière telle que celle-ci présente un rayon de courbure minimal de 2100 mm.
  4. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le guidage de barre (4) présente au moins par tronçons, la forme d'un clothoïde.
  5. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la lingotière est réalisée sous la forme d'une lingotière courbe.
  6. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la longueur de la lingotière s'élève au maximum à 1100 m, de préférence se situe entre 900 mm et 1000 mm.
  7. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la hauteur du guidage de barre (4) sans la lingotière présente une hauteur maximale de 3 m.
  8. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le système de raccordement (5) présente l'unité de dressage et d'extraction (6) de même que le four (7) ; dans laquelle, entre l'unité de dressage et d'extraction (6) et le four (7), est disposé un dispositif de séparation (9), en particulier une cisaille; dans laquelle l'unité de dressage et d'extraction, de même que le dispositif de séparation sont réalisés de préférence, du point de vue de la construction, sous la forme d'une unité structurelle.
  9. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le système de raccordement (5) présente un releveur de barre froide (10) avec isolation intégrée.
  10. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 9, caractérisée en ce que le guidage de barre (4) se termine avant le point de tangente (T).
  11. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 9, caractérisée en ce que le guidage de barre (4) se termine au point de tangente (T) ou derrière ce dernier.
  12. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 11, caractérisée en ce que l'unité de dressage et extraction (6) présente des rouleaux entraînés sur le côté supérieur et sur le côté inférieur de la brame (2).
  13. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 12, caractérisée en ce que le four (7) est plus court que 100 m.
  14. Installation de coulée-laminage selon l'une quelconque des revendications 1 à 13, caractérisée en ce que le four (7) présente au moins un élément de chauffage par induction.
  15. Installation de coulée-laminage selon la revendication 14, caractérisée en ce qu'au moins un capot de chauffage est monté avant ou après le four (7) dans la direction de transport (F).
  16. Procédé pour l'exploitation d'une installation de coulée-laminage selon l'une quelconque des revendications 1 à 15, caractérisée en ce que la barre de coulée, coulée dans la machine de coulée (3), est acheminée en l'absence d'un réchauffement ultérieur dans le four (7) au laminoir (8) et est soumise à un laminage dans ce dernier.
  17. Procédé selon la revendication 16, caractérisé en ce que la barre de coulée est refroidie, après sa coulée, dans le guidage de barre, d'une manière telle que, lorsqu'elle atteint le mécanisme de dressage et d'extraction (6), elle est complètement solidifiée.
  18. Procédé selon la revendication 15 ou 16, caractérisé en ce que la barre de coulée, après sa coulée, est refroidie dans le guidage de barre par l'intermédiaire du réglage de la quantité d'eau de refroidissement et/ou de la vitesse de coulée, d'une manière telle qu'elle est complètement solidifiée à une distance de 500 mm à 10 mm dans la direction de transport (F) avant le dernier rouleau du guidage de barre.
  19. Procédé selon l'une quelconque des revendications 15 à 18, caractérisé en ce que la température à l'entrée du four est supérieure à 1050 °C.
  20. Procédé selon l'une quelconque des revendications 15 à 19, caractérisé en ce que les aciers au carbone font l'objet d'une transformation avec des teneurs minimes et moyennes en carbone.
  21. Procédé selon l'une quelconque des revendications 15 à 20, caractérisé en ce que la barre de coulée quitte le guidage de barre de l'installation de coulée avec une épaisseur entre 40 mm et 60 mm, de préférence avec une épaisseur de 45 mm à 55 mm.
EP16720393.4A 2015-05-06 2016-04-27 Installation de coulée et de laminage et procédé pour la faire fonctionner Active EP3291933B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102015208434 2015-05-06
DE102015210865.1A DE102015210865A1 (de) 2015-05-06 2015-06-12 Gieß-Walz-Anlage und Verfahren zu deren Betrieb
PCT/EP2016/059370 WO2016177611A1 (fr) 2015-05-06 2016-04-27 Installation de coulée et de laminage et procédé pour la faire fonctionner

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EP3291933A1 EP3291933A1 (fr) 2018-03-14
EP3291933B1 true EP3291933B1 (fr) 2019-06-19

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JP (1) JP2018515344A (fr)
DE (1) DE102015210865A1 (fr)
WO (1) WO2016177611A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102017219464A1 (de) 2017-10-30 2019-05-02 Sms Group Gmbh Stranggießanlage mit Einzelrollenanstellung
DE102017220616A1 (de) 2017-11-17 2019-05-23 Sms Group Gmbh Dünnbrammengießanlage mit wechselbarem Maschinenkopf
DE102018207137A1 (de) 2018-05-08 2019-11-14 Sms Group Gmbh Gieß-Walz-Anlage, und Verfahren zu deren Betrieb

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EP3291933A1 (fr) 2018-03-14
DE102015210865A1 (de) 2016-11-10

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