EP3705202A1 - Transformation d'une installation de coulée continue pour billettes et blooms - Google Patents

Transformation d'une installation de coulée continue pour billettes et blooms Download PDF

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Publication number
EP3705202A1
EP3705202A1 EP20153887.3A EP20153887A EP3705202A1 EP 3705202 A1 EP3705202 A1 EP 3705202A1 EP 20153887 A EP20153887 A EP 20153887A EP 3705202 A1 EP3705202 A1 EP 3705202A1
Authority
EP
European Patent Office
Prior art keywords
strand
pull
mold
unit
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.)
Granted
Application number
EP20153887.3A
Other languages
German (de)
English (en)
Other versions
EP3705202B1 (fr
Inventor
Denijel Burzic
Jeffrey Morton
August Pühringer
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.)
Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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Publication date
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Publication of EP3705202A1 publication Critical patent/EP3705202A1/fr
Application granted granted Critical
Publication of EP3705202B1 publication Critical patent/EP3705202B1/fr
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Classifications

    • 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
    • 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
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/043—Curved moulds
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • 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
    • 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
    • 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
    • B22D11/1284—Horizontal removing

Definitions

  • the present invention relates to the technical field of continuous casting.
  • Today, the majority of the world's steel produced annually is cast into strands with different cross-sections (slabs, billets, blooms, profiles, etc.) in continuously operated continuous casting plants.
  • the present invention relates to a method for converting a continuous casting plant for continuous casting of a strand with a billet or bloom cross-section.
  • the invention relates to the converted continuous caster for the continuous casting of a strand with a billet or bloom cross-section.
  • the object of the invention is to find a method for converting an existing continuous caster to continuously cast a strand with a billet or bloom cross-section so that the conversion can be carried out with low conversion costs, a short conversion time and a high level of reusability of existing components.
  • the metallurgical quality of the strands produced is to be increased.
  • the rebuilding process according to the invention can increase the productivity of the continuous caster on the one hand by increasing the casting speed, whereby the mold, at least parts of the strand guide, the pull-out unit and the outlet area can remain completely unchanged. Only the flame cutting machine is offset in the horizontal direction in the casting direction, so that at least one soft-reduction unit is inserted in the space that is created between the last pull-out unit in the casting direction and the offset flame cutting machine can be. The two strand shells of the partially solidified strand are pressed together by the soft reduction unit, which improves the internal quality of the strand.
  • At least one strand guide roller of the soft-reduction unit is adjusted to the strand by an adjusting device (typically a hydraulic cylinder), whereby the thickness of the strand is reduced. If, in addition to increasing the casting speed, the cross-section of the billet or bloom strand is also increased, the mold and the strand guide must be adapted to the changed cross-section.
  • an adjusting device typically a hydraulic cylinder
  • a first insulation tunnel for thermal insulation of the strand is used between the rear end of the strand guide or the last segment of the strand guide in the casting direction and the pull-out unit.
  • the solidification point of the strand is shifted in the casting direction, so that the strand enters the outlet area at a higher temperature.
  • the casting speed and / or the cooling intensity of the converted continuous caster is set by a system control so that the solidification point of the strand is between the axis of rotation of the roll of the first soft-reduction unit and the axis of rotation of the roll of the last soft-reduction unit lies.
  • the cross-section of the strand in the soft reduction units can be changed by moderate forces.
  • the freezing point of the strand lies in the area of the middle of the last soft reduction unit.
  • a first insulation tunnel is arranged between the rear end of the strand guide or the last segment in the casting direction and a first pull-out unit or a second insulation tunnel for thermal insulation of the strand is arranged between the last pull-out unit and the first soft-reduction unit .
  • a radius of curvature R of the curved strand guide is between 8 m and 12 m, preferably between 9 m and 11 m.
  • the converted continuous caster has between 4 and 6 soft-reduction units.
  • a continuous caster 1 for the continuous casting of strands with billet or bloom cross-sections is shown schematically.
  • a ladle turret with a ladle is shown in the upper left area of the figure.
  • the continuous casting plant 1 is supplied with molten steel by means of the ladle via a crane shown at the very top. From the ladle, the molten steel in and of itself is conducted in a known manner via a shadow tube into the distributor and from there typically filled into the mold 2 via a dip tube ( SEN ).
  • SEN dip tube
  • a constant pour level and a partially solidified strand with a liquid core and two solidified strand shells are formed.
  • strand shells In order to prevent the strand shells from sticking to the mold 2, casting powder is applied to the meniscus and the mold 2 is oscillated essentially in the vertical direction via an oscillating unit 2a.
  • the partially solidified strand is supported, guided and further cooled by cooling nozzles in the curved strand guide 3 following the mold 2.
  • Fig 1 In the Fig 1 is a segment to support and guide the strand 4 shown with several strand guide rollers arranged on both sides of the strand.
  • the arcuate strand is drawn out of the mold 2 by the pull-out unit 5 with at least one driven strand guide roller, here two or three pairs of driven pull-out rollers, and straightened in the horizontal direction.
  • a cold strand pull-out unit 13 which can accommodate the likewise curved cold strand after the continuous casting installation 1 has been cast on.
  • the strand is then transported on a roller table to the flame cutting machine 6, where it is cut into strand sections.
  • the strand sections are either deposited in the run-out area 7 or are further processed by the roll stands following the run-out area 7 into wires, profiles or similar products.
  • Such continuous casting plants 1 are inexpensive to purchase and operate, but are unable to keep up with modern continuous casting plants either in terms of the productivity of the plant or the quality of the strands produced. Accordingly, there is a need to convert existing continuous casting plants in order to increase the quality of the strands produced and / or the productivity of the continuous casting plant.
  • the solidification point of the strand in the strand guide shifts at higher casting speeds in the direction of the material to the rear, i.e. in the direction of the outlet area 7.
  • either the strand would have to be cooled more intensively by the strand cooling or the Curve radius of the strand guide can be increased.
  • both measures are problematic because on the one hand more intensive strand cooling deteriorates the quality of the strand and on the other hand a larger arc radius increases the height of the continuous caster, which is very problematic in an existing hall with a given height.
  • the technical object is achieved in that the flame cutting machine 6 is offset backwards in the casting direction, so that a free space F is created between the last pull-out unit 5 and the offset flame cutting machine 6, and at least one soft reduction unit 8 is installed in the free space F , each soft-reduction unit 8 having an adjusting device 9 and a strand guide roller 10 which can be adjusted by the adjusting device for reducing the thickness of the strand.
  • the converted continuous caster 1 is in Fig 2 as well as further details in the Fig. 3 to 5 shown.
  • the flame cutting machine 6 is offset in the direction of material flow in the direction of the outlet area 7.
  • a free space F (see Fig 2 ) formed between the rear end of the pull-out unit 5 and the front end of the flame cutting machine 6.
  • the soft reduction unit 8 or a plurality of such units 8a ... 8e is used in this free space F.
  • the soft reduction units 8 are typically inserted by a crane, as in the soft reduction units 8b, 8c in FIG Fig 4 indicated.
  • the pull-out unit 5 and the cold-strand pull-out unit 13 can typically be left in the same position (see FIG Fig 3 and 4th ), which further reduces the conversion time and effort.
  • first and second insulation tunnels 11, 12 can be installed between the last segment 4 of the strand guide 3 and the pull-out unit 5 and between the pull-out unit 5 and the soft-reduction unit 8 (please refer Fig 2 ).
  • the solidification point of the converted continuous caster lies in the area between the first soft-reduction unit 8a and the last soft-reduction unit 8e. This is ensured by a system control during operation.
  • the mold 2 is designed as a curved mold and the radius of the mold 2 and the radius R of the curved guide 3 are between 8 m and 12 m, preferably between 9 m and 11 m.
  • each reduction unit 8 has an adjusting device 9 (here a hydraulic cylinder) which can move an upper strand guide roller 10b in the direction of a lower strand guide roller 10a. By adjusting the upper strand guide roller 10b to the strand, not shown, the strand is reduced in its thickness. All reduction units 8a ... 8e are constructed identically and connected to the foundation via a base frame. Further details on soft reduction units are not necessary, since these are derived from the WO 2009/144107 A1 are known.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP20153887.3A 2019-03-06 2020-01-27 Transformation d'une installation de coulée continue pour billettes et blooms Active EP3705202B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50173/2019A AT522265B1 (de) 2019-03-06 2019-03-06 Umbau einer stranggiessanlage für knüppel- oder vorblockstränge

Publications (2)

Publication Number Publication Date
EP3705202A1 true EP3705202A1 (fr) 2020-09-09
EP3705202B1 EP3705202B1 (fr) 2022-01-19

Family

ID=69326433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20153887.3A Active EP3705202B1 (fr) 2019-03-06 2020-01-27 Transformation d'une installation de coulée continue pour billettes et blooms

Country Status (3)

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EP (1) EP3705202B1 (fr)
CN (1) CN111659863B (fr)
AT (1) AT522265B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112355256A (zh) * 2020-11-30 2021-02-12 中冶赛迪工程技术股份有限公司 一种超高速小方坯连铸装置及生产方法
CN114799106A (zh) * 2022-06-01 2022-07-29 娄底职业技术学院 一种基于连铸结晶器液位控制的连铸机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10236368A1 (de) * 2002-02-22 2003-09-04 Sms Demag Ag Verfahren und Vorrichtung zum Stranggiessen und unmittelbaren Verformen eines Metall-, insbesondere eines Giessstrangs aus Stahlwerkstoffen
WO2009144107A1 (fr) 2008-05-26 2009-12-03 Siemens Vai Metals Technologies Gmbh & Co Installation de coulée continue à plusieurs lignes
CH712937A2 (de) * 2016-09-19 2018-03-29 Sms Concast Ag Vorrichtung zur Soft-Reduktion eines Stranges für eine Stranggiessanlage.

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WO2009144107A1 (fr) 2008-05-26 2009-12-03 Siemens Vai Metals Technologies Gmbh & Co Installation de coulée continue à plusieurs lignes
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112355256A (zh) * 2020-11-30 2021-02-12 中冶赛迪工程技术股份有限公司 一种超高速小方坯连铸装置及生产方法
CN114799106A (zh) * 2022-06-01 2022-07-29 娄底职业技术学院 一种基于连铸结晶器液位控制的连铸机

Also Published As

Publication number Publication date
CN111659863A (zh) 2020-09-15
AT522265B1 (de) 2021-12-15
EP3705202B1 (fr) 2022-01-19
AT522265A1 (de) 2020-09-15
CN111659863B (zh) 2024-04-02

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