EP1585605A1 - Procede et dispositif pour produire des brames d'acier par coulee continue - Google Patents

Procede et dispositif pour produire des brames d'acier par coulee continue

Info

Publication number
EP1585605A1
EP1585605A1 EP04702673A EP04702673A EP1585605A1 EP 1585605 A1 EP1585605 A1 EP 1585605A1 EP 04702673 A EP04702673 A EP 04702673A EP 04702673 A EP04702673 A EP 04702673A EP 1585605 A1 EP1585605 A1 EP 1585605A1
Authority
EP
European Patent Office
Prior art keywords
strand
reducing
cast
rollers
continuous casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04702673A
Other languages
German (de)
English (en)
Inventor
Adolf Gustav Zajber
Dirk Letzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1585605A1 publication Critical patent/EP1585605A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B21B1/46—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
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • 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
    • B21B2001/022—Blooms or billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/22—Hinged chocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/006—Pinch roll sets

Definitions

  • the invention relates to a method and an apparatus for producing slabs in a continuous casting plant, with an oscillating casting mold, a downstream strand guide, in which the cast strand is bent from the vertical casting direction in the horizontal rolling direction and thereby against each other in pairs, with a defined contact force -
  • Other employed driver rollers which can be combined into segments, are supported, conveyed and deformed by at least one pair of driver rollers to a thickness which is reduced compared to the cast state, after which the endless preliminary profile or the reducing strand is divided into slabs and these into a compensating furnace and then into one Rolling mill to be promoted.
  • the driver rollers are pressed against the strand with a certain pressure, which prevents the driver rollers from slipping and one below the solidification point generates sufficient traction on the strand.
  • the state of the art here is to use this pressure of the driver rollers in the area of solidification or locally earlier to change the strand thickness, since the rolling forces to be applied are low in the cast strand which is still soft here.
  • DE 38 22 939 C1 describes a continuous casting process for the production of slabs with a reduced thickness compared to the cast state, a strand which is partially solidified in cross section being deformed by rollers which can be adjusted hydraulically against one another.
  • rollers which can be adjusted hydraulically against one another.
  • These roles work both deforming on the strand within the solidification section and in the area of the solidified strand, the strand being deformed from approx. 60 mm to a final dimension of 20 to 15 mm and at the same time a product having a high proportion of roll structure is produced.
  • at least one pair of rollers which acts on the part of the strand that has already solidified, can be adjusted against the stop to ensure the final dimension of the strand.
  • DE 198 17 034 A1 discloses a process for the continuous casting of thin metal strips in a continuous casting installation with an oscillating water-cooled mold, in which at least immediately after the solidification of the cast strand to achieve a defined thickness reduction of at least 2% and to keep a preset target strand thickness constant a pair of driver rollers is continuously pressed against the strand with a variable, defined pressure.
  • EP 0 804 981 B1 discloses a continuous casting method and a continuous casting apparatus in which cast slabs are fed to a multiplicity of reduction devices, each of the reduction devices is assigned a target rolling reduction or a target pressure and a deformation of a liquid core of the slabs is carried out, cast castings being carried out Slabs with increased or reduced thickness compared to the slabs continuously withdrawn from the mold can be produced.
  • the solidification behavior of austenites is characterized by a shrinkage during the conversion of ferrite to austenite, which causes the strand shell to contract. This pulling in can lead to increased delta ferrite contents and to poorer thermoformability at the corresponding points. The uneven solidification on the surface then causes the so-called scale streak in direct rolling. Such negative phenomena usually have to be removed by grinding.
  • the object is achieved in terms of the method with the characterizing features of claim 1 and in terms of the device with the characterizing features of claim 9 in that the cast strand is still early in the continuous casting plant in the area of the bending or straightening driver rollers after it has completely solidified and at such a high temperature is deformed in such a targeted manner with a high energy input by at least one reducing stand that • the depth of the oscillation marks present in the cast strand surface is reduced, and
  • the fine-crystalline edge layer is enlarged and, in the subsequent thermal treatment in an equalizing furnace, there is increased recrystallization with grain refinement in the formed edge zone of the slab.
  • This positive effect of such an early deformation with high energy input, in particular in the edge region of the cast strand, as a result of which the recrystallization during the subsequent thermal treatment in a compensating furnace is favorably influenced and as a result of which the oscillation marks are flattened early, so that the heat flow over the strand surface can take place uniformly , is preferably achieved at a surface temperature of the cast strand in the range of 1000 ° C.
  • This deformation by means of which a subsequent surface treatment, for example by grinding, is reduced to a minimum, is carried out according to the invention with one or more reduction stands with roller diameters performed between 600 and 900 mm, preferably with a roll diameter of 700 mm for the reduction of a 50 mm thick cast strand by an amount of max. 7 mm.
  • the rollers of the reduction stand are therefore pre-profiled and the reduction stand (s) are provided with a thickness control and are connected to the subsequent rolling mill for feedback of the rolling parameters to be set. If several reduction stands are used, the last pair of rolls is only used to reduce the cast strand slightly, with high dimensional accuracy of the desired preliminary profile. These measures can then be used to produce a cast strand with precisely set geometric data and an improved surface, even in the continuous casting plant, so that slabs can be offered to the subsequent hot rolling mill without prior, expensive surface processing.
  • At least one reducing stand is arranged in the continuous casting installation in the region of the bending or straightening driver rollers.
  • the following positions are available:
  • 1 is a flow diagram of a continuous caster with a compensating furnace
  • FIG. 3 shows a continuous casting installation with a reduction scaffold in a column construction according to the directional drivers
  • FIG. 4 shows a continuous casting installation with a reduction framework in lever construction according to the directional drivers
  • Fig. 5 is a continuous caster with converted to a reducing scaffold
  • FIG. 1 shows the process steps of a continuous casting installation 10 relevant to the invention, namely production of the cast strand 12 in an oscillating mold 11, deformation of the cast strand 12 in a reducing frame 30 to a reducing strand 12 ', thermal treatment of the reducing strand 12' divided into slabs 12 "in one Equalization oven 40.
  • the cast strand 12 produced leaves the oscillating mold 11 in the vertical direction, is bent into the horizontal strand conveying direction 13 and is used as a Continuous cast strand 12 fed to a reduction stand 30. This is where the deformation according to the invention takes place, as a result of which a reducing strand 12 'with the desired surface properties is produced.
  • the reducing strand 12 'has been separated into slabs 12 " they are thermally treated in a compensating furnace 40 before they are fed to the rolling mill (the rolling mill is not shown).
  • the microstructures of the cast strand or respectively obtained in these different process steps in FIG Slabs are shown schematically in FIGS. 2a-2c in vertical sections.
  • the cast strand 12 produced in the mold 11 has a cast structure 14 (FIG. 2a) with a finely crystalline edge zone 18 produced when the cast strand 12 solidifies.
  • the strand surface 16 there are oscillation marks 17, represented as serrated depressions, which during the casting process in the Chill mold were produced and u. a. lead to the surface defects described in the subsequent rolling process.
  • these oscillation marks 17 have been largely smoothed out, so that there are now only smaller depressions 17' in the strand surface 16 '.
  • the original fine-crystalline structure of the edge zone 18 was partially recrystallized in a small inner area 19 by entering a higher energy state into the deformed edge zone 18 ', the influence of which extends into the area of the directed dendrites.
  • This recrystallized area 19 could then expand during the subsequent thermal treatment of the slab 12 "in the equalizing furnace 40 (FIG. 2c) to the completely recrystallized edge zone 19 '.
  • FIGS. 3, 4 and 5 different reducing stands 30 are installed in an existing continuous casting installation 10. For better clarity, this is the same continuous casting plant 10, which is why the same Parts of the plant were also given the same reference numbers.
  • the cast strand 12 produced in the oscillating mold (not shown here) of the continuous casting plant 10 is first guided vertically downward, being supported by pairs of rollers of a vertical strand guide 20 and being conveyed by driver rollers 21.
  • the cast strand 12 is bent from the vertical casting direction into the horizontal conveying direction 13 and conveyed in a strand guide 23 by means of directional drivers 24 in the rolling direction.
  • a cutting device 25 is arranged, into which the continuous casting or reducing strand 12 'is divided into slabs 12 "of the desired length. Behind the cutting device 25, the system parts, the compensation furnace 40 and the rolling mill, are no longer shown.
  • two additional reduction stands 30a are arranged in a column construction in the existing space between the directional drivers 24 and the cutting device 25 of the continuous casting installation 10, in which the continuous casting strand 12 is deformed to the reducing strand 12 '.
  • the two reducing stands 30a are significantly larger than the otherwise customary drivers and, compared to the rollers of the strand guide, have a significantly larger diameter of their rollers 31 (according to the invention between 600 and 900 mm). This ensures the desired energy input into the cast strand 12 when the deformation is carried out by smoothing the surface (reducing the depth of the oscillation mark).
  • FIG. 4 two reducing stands 30b in lever construction are provided in the continuous casting plant 10 at the same place instead of the reducing stands 30a of FIG. 3.
  • the reducing stands 30b and their rollers 31 are dimensioned significantly larger than the otherwise usual drivers of the strand guide. 5
  • no additional reducing stands are provided in the continuous casting plant 10.
  • the deformation of the cast strand 12 according to the invention is carried out by the original directional drivers 24 converted into a reduction frame 30c, which are also dimensioned significantly larger than the otherwise usual directional drivers 24 (see FIGS. 3 and 4).
  • the invention is not restricted to the exemplary embodiments shown.
  • the number of reducing stands 30a, 30b and converted directional drivers 30c shown in FIGS. 3 to 5 only represent an exemplary number that can be varied accordingly by the person skilled in the art according to the existing local conditions.
  • the same also applies to the selection of the scaffolding type and the selection of its locations or the combination of different locations within the continuous casting installation, in which case the properties of the cast strand must also be taken into account.

Landscapes

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

Abstract

Les produits de coulée continue (12) présentent souvent à l'état brut de coulée, lorsqu'ils sont produits dans un moule de coulée (11) d'une installation de coulée continue (10), des défauts de surface tels que des marques d'oscillation (17) et d'autres irrégularités de structure. Lors du laminage ultérieur de la brame (12'') en bande, il apparaît souvent des défauts de bande qui rendent cette bande inutilisable pour des applications de meilleure qualité. Afin de minimiser ces défauts et d'amener au laminoir une brame (12'') présentant une préforme souhaitée et une structure améliorée à proximité de la surface, une cage de laminoir réducteur (30) est placée à l'intérieur de l'installation de coulée continue (10), dans la zone des cylindres de flexion ou d'entraînement redresseurs (24). Cette cage de laminoir réducteur (30) permet de déformer de manière ciblée la barre de coulée (12) une fois qu'elle est complètement durcie, de manière précoce dans le temps et à une température encore élevée, à l'aide d'un grand apport d'énergie, de façon à réduire la profondeur des marques d'oscillation (17) présentes sur la surface (16) de la barre de coulée. La libération de cette énergie appliquée lors de la déformation dans la barre de réduction (12') implique une augmentation de la couche limite à cristaux fins (18), ainsi qu'une recristallisation amplifiée, lors du traitement thermique ultérieur dans un four de nivellement (40), avec un affinement de grain dans la zone limite déformée (19) de la brame (12'').
EP04702673A 2003-01-22 2004-01-16 Procede et dispositif pour produire des brames d'acier par coulee continue Withdrawn EP1585605A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10302265A DE10302265A1 (de) 2003-01-22 2003-01-22 Verfahren und Vorrichtung zur Erzeugung von stranggegossenen Stahlbrammen
DE10302265 2003-01-22
PCT/EP2004/000282 WO2004065030A1 (fr) 2003-01-22 2004-01-16 Procede et dispositif pour produire des brames d'acier par coulee continue

Publications (1)

Publication Number Publication Date
EP1585605A1 true EP1585605A1 (fr) 2005-10-19

Family

ID=32602843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04702673A Withdrawn EP1585605A1 (fr) 2003-01-22 2004-01-16 Procede et dispositif pour produire des brames d'acier par coulee continue

Country Status (8)

Country Link
US (1) US7137437B2 (fr)
EP (1) EP1585605A1 (fr)
JP (1) JP2006516224A (fr)
KR (1) KR20050092433A (fr)
CN (1) CN100335188C (fr)
CA (1) CA2515713A1 (fr)
DE (1) DE10302265A1 (fr)
WO (1) WO2004065030A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005059692A1 (de) 2005-12-14 2007-06-21 Sms Demag Ag Verfahren zum Stranggießen dünner Metallbänder und Stranggießanlage
DE102006043797A1 (de) * 2006-09-19 2008-03-27 Sms Demag Ag Verfahren zum Stranggießen eines Metallstranges
AT506824B1 (de) 2008-05-26 2013-01-15 Siemens Vai Metals Tech Gmbh Mehrstrang-stranggiessanlage
DE102010020371A1 (de) 2010-05-12 2011-11-17 Sms Siemag Ag Verfahren und Vorrichtung zum Schneiden eines Strangs
KR101660769B1 (ko) 2014-12-02 2016-09-28 주식회사 포스코 주조장치
CN107413850B (zh) * 2017-06-28 2019-02-01 钢铁研究总院 用于直接轧制方矩形钢坯的输送过程铸轧衔接方法
CN107552750B (zh) * 2017-08-07 2023-05-23 中冶连铸技术工程有限责任公司 可生产超大断面异型坯或板坯的多流连铸机及生产方法
CN107653362A (zh) * 2017-09-19 2018-02-02 鲁东大学 一种400系不锈钢钢锭钢坯皮下裂纹消除的工艺方法
CN110227719A (zh) * 2019-07-04 2019-09-13 攀钢集团攀枝花钢钒有限公司 用于低合金热轧钢板表面起皮缺陷的控制方法

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Also Published As

Publication number Publication date
KR20050092433A (ko) 2005-09-21
DE10302265A1 (de) 2004-07-29
US7137437B2 (en) 2006-11-21
CN1777481A (zh) 2006-05-24
CA2515713A1 (fr) 2004-08-05
WO2004065030A1 (fr) 2004-08-05
CN100335188C (zh) 2007-09-05
JP2006516224A (ja) 2006-06-29
US20060054297A1 (en) 2006-03-16

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