WO2010057967A1 - Procédé et installation de coulée continue pour la production de brames épaisses - Google Patents

Procédé et installation de coulée continue pour la production de brames épaisses Download PDF

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Publication number
WO2010057967A1
WO2010057967A1 PCT/EP2009/065526 EP2009065526W WO2010057967A1 WO 2010057967 A1 WO2010057967 A1 WO 2010057967A1 EP 2009065526 W EP2009065526 W EP 2009065526W WO 2010057967 A1 WO2010057967 A1 WO 2010057967A1
Authority
WO
WIPO (PCT)
Prior art keywords
strand
guide
steel strand
steel
mold
Prior art date
Application number
PCT/EP2009/065526
Other languages
German (de)
English (en)
Inventor
Karl Moerwald
Paul Pennerstorfer
Michael Stiftinger
Josef Watzinger
Original Assignee
Siemens Vai Metals Technologies Gmbh & Co
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=41560406&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2010057967(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens Vai Metals Technologies Gmbh & Co filed Critical Siemens Vai Metals Technologies Gmbh & Co
Priority to BRPI0921942A priority Critical patent/BRPI0921942A2/pt
Priority to KR1020117014204A priority patent/KR101658342B1/ko
Priority to RU2011124890/02A priority patent/RU2476290C1/ru
Priority to CN2009801466275A priority patent/CN102333605B/zh
Priority to EP09784060.7A priority patent/EP2349612B2/fr
Publication of WO2010057967A1 publication Critical patent/WO2010057967A1/fr

Links

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
    • B22D11/04—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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended 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
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • 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
    • B22D11/14—Plants for 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
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould

Definitions

  • the invention relates to a method for producing thick steel slabs with a casting thickness exceeding 360 mm and a casting width exceeding 1000 mm in a continuous casting plant. Furthermore, the invention relates to a continuous casting plant for carrying out this method.
  • a continuous casting plant of the type "Vertical Plant or Vertical Turning Plant”, which has a long vertical strand guide part with subsequent bending and straightening zone, is from the publication of Dr.-Ing Klaus Harste et al; "Construction of a new vertical caster at Dillinger Wegtentechnike”; MPT International 4/1998; P. 1 12-122 already known.
  • This casting plant whose layout is shown in Figure 8, allows the casting of steel strands with a casting widths of 1400 to 2200 mm and a casting thickness between 230 and 400 mm. It has a very long vertical strand guide with cooling equipment for intensive strand cooling in this section to allow subsequent bending and straightening of the steel strand with solidified strand.
  • This plant concept leads to a large construction height of the continuous casting plant of about 45 m and thus to high investment costs, especially in the necessary infrastructure and to difficult maintenance conditions.
  • the achievable casting speed is about 0.3 m / min, whereby the productivity per strand is relatively low.
  • the low casting speed also means that the cast steel strand can not be kept hot enough for straightening and must therefore be kept below a critical temperature with intensive cooling to avoid Ductility problems, which typically occur in temperature ranges from 600 to 850 0 C.
  • the object of the present invention is therefore to avoid the disadvantages of the known prior art and to propose a method for the production of thick steel slabs and a continuous casting plant for carrying out this process, wherein the production of high-quality steel strands and slabs in a 360 mm crossing Casting thickness with good internal quality, low susceptibility to cracking and extensive Formathaltmaschine is guaranteed.
  • Another object of the invention is to keep the investment and operating costs low with high productivity of the casting plant.
  • the object underlying the invention is achieved in a method for producing thick steel slabs with a casting thickness exceeding 360 mm and a casting width exceeding 1000 mm by the combination of the following features:
  • a curved mold does not have the conditions, which are known from a straight mold, for introducing the steel melt into the mold and for uniform strand shell formation.
  • the need for a strand bend in a bending zone immediately after or at a short distance from the mold can be largely or completely avoided. The risk of cracking in the edge or surface area of the strand is thereby reduced.
  • the arc mold used in the proposed method may be formed with a straight inlet section and a curved outlet section, wherein the outlet section has a curvature corresponding to a predetermined mold bending radius.
  • the mold cavity of the curved mold can also be continuously curved with a constant mold radius of curvature. Variations of these embodiments are possible.
  • the cast steel strand at the exit from the arc mold corresponds to the strand guide arc radius of the circular arc guide in the strand guide
  • the cast steel strand is freely transferred from the arc mold into the arc guide of the strand guide.
  • the mold radius of curvature of the cast steel strand as it exits the arc mold may be greater or less than the strand guide arc radius in the strand guide and the cast steel strand in a bend zone within the strand guide from the mold arc radius of the cast steel strand as it exits the strand Curved mold can be bent to the strand guide arc radius in the strand guide.
  • This embodiment makes it possible to hold the cast steel strand after its exit from the arch mold with the curvature impressed on it, which corresponds to the Kokillenausgangs districten Kokillen arc radius constant over a certain distance and then make a strand bend on the strand guide arc radius within a bending zone or make this bending process immediately after the exit of the steel strand from the Bogenkokille. In any case, the bending process is kept low even with low strand shell thickness.
  • the bending of the cast steel strand to a predetermined radius of curvature in a bending zone and the bending back of the cast steel strand in a straightening zone corresponds to the concept of known continuous slab casters and has proven itself as such.
  • Essential for the casting of thick slabs is that both processes take place at times at which the steel strand still has a liquid or partially liquid core, or it is necessary to regulate the cooling of the steel strand in the strand guide accordingly.
  • the requirements for the most uniform possible cooling which must necessarily be reflected in a uniform over the strand length and strand width temperature distribution at high temperature level in order to ensure a uniform elasticity of the strand and to avoid cracking due to temperature differences.
  • the desired and the system control predetermined temperature profile is determined by an inlet surface temperature of the steel strand in the straightening zone of the strand guide.
  • the steel strand including the surface area should be kept in a temperature range which is above the ductility low, whereby the tendency to form surface cracks is also minimized.
  • a plant with a bow mold has a lower strand length from the casting level to the straightening zone in comparison with a plant with a straight die at the same strand guide arc radius. Therefore, the time it takes the strand for the same casting speed for this route, shorter than in a comparable system with a straight mold. Due to the shorter time available for cooling, it is possible to keep the surface temperature at a comparatively higher level. This minimizes the tendency to form surface cracks.
  • the proportion of the solid strand shell of the cast steel strand amounts to a maximum of 95% of half the strand thickness during the phase of re-bending in the straightening zone.
  • a thinning of the steel strand using a soft-reduction or a dynamic soft reduction aims at thorough mixing of the preferably partially solidified core zone near the solidification point of the strand and thus achieves an improved microstructure in the core region of the slab and approaches to line separations and porosities avoided.
  • a soft-reduction in particular a dynamic soft-reduction, is applied to the cast steel strand in a still liquid or semi-liquid core region of the steel strand with a strand guide roll adjusting device.
  • the cast steel strand is bent in a bending zone within the strand guide to a radius of curvature between 9.0 m and 15.0 m, held in a subsequent circular arc guide the strand guide on this radius of curvature without further deformation and in a subsequent straightening zone within the strand guide, starting from an arc radius between 9.0 m and 15.0 m straightened again.
  • this radius of curvature while providing the most accurate possible cooling in these areas of the strand guide, provides the best surface quality and minimizes cracking on the cast steel strand.
  • the impact position of the coolant jets on the cooling of the cast steel strand Steel strand at least in a portion of the strand guide on the basis of a continuous determination of the temperature profile along the transport path of the steel strand and regulated in normal planes thereto.
  • the amount of coolant applied to the steel strand in the strand guide until it enters the straightening zone is regulated as a function of a predetermined temperature profile along the transport path of the steel strand and in a normal plane. This is intended to achieve a further increase in the accuracy of the temperature distribution over the steel strand surface.
  • the given temperature profile takes into account the ductility characteristics of the steel grade to be cast.
  • the flow movement of the molten steel of the liquid core of the steel strand in the mold or in the region of the strand guide is influenced by an electromagnetic device.
  • an electromagnetic device In addition to an increased rise of the non-metallic impurities to the bath level surface in the mold, there is a targeted mixing of the molten steel and to reduce segregation tendencies.
  • the method described is used for producing thick steel strands when the steel strand is cast with a casting thickness lying in a thickness range of 360 mm to 450 mm.
  • the object stated in the introduction is achieved in a continuous casting plant for the production of thick steel slabs with a casting thickness exceeding 360 mm, preferably at a casting thickness of 360 mm to 450 mm and a casting width exceeding 1000 mm, by the combination of the following features:
  • a curved mold having a mold cavity which is curved on the output side at least over a partial region of its longitudinal extent and has an output-side mold arc radius for producing a steel strand having a liquid core
  • a strand guide for supporting and guiding the cast metal strand from a casting direction determined by the mold arc radius in a horizontal transport direction extending from the mold to a dicing device
  • a cooling device in the strand guide for the continuous, controlled cooling of the steel strand which is connected to and controlled by a central processing unit and in which a mathematical model for the continuous determination of the temperature profile along the transport path of the steel strand and in normal planes is deposited;
  • a dicing device for dividing the steel strand on slabs of predetermined length.
  • Essential in a continuous casting plant of this type is the combination of a curved mold with a downstream strand guide, with a circular arc guide and with a straightening zone, in conjunction with a cooling device for controlled cooling of the steel strand shaping, transporting and straightening the cast steel strand at liquid core and high quality requirements of the ensures cast steel strand or slabs in the claimed thickness range.
  • the output side mold arc radius is greater or smaller than the strand guide arc radius of the circular arc guide within the strand guide.
  • a bending zone is disposed within the strand guide for bending the cast steel strand to a predetermined strand guide arc radius while the core is still liquid.
  • the cooling device in the strand guide is equipped with several independently controllable cooling zones over the casting width and / or with height-adjustable spray nozzles with controllable adjusting devices. This is a targeted influencing the strand edge temperature by a width-dependent control of the amount of cooling water and / or a change in the distance of the spray nozzles from the steel strand surface and thus a change in the lateral distance of the coolant jet from the steel strand edge possible.
  • One or more electromagnetic devices for influencing the flow motion of the molten steel of the liquid core of the steel strand are arranged in the mold or in the region of the curved strand guide.
  • peripherally cooled strand guide rollers are arranged in the strand guide for supporting and guiding the steel strand.
  • FIG. 1 shows a longitudinal section through a continuous casting plant according to the invention according to a first embodiment
  • FIG. 3 shows the arrangement of spray nozzles of a cooling device in a strand guide
  • Fig. 4 shows a further embodiment of the cooling device with independently controllable cooling zones.
  • FIG. 1 shows a schematic longitudinal section of the structural design of a continuous casting plant for producing slabs of liquid steel for a casting thickness of 400 mm.
  • the continuous casting plant has a curved mold 1 with a curved aligned mold cavity 1a. It is designed as an oscillating, internally cooled Verstellkokille with broad side walls and narrow side walls and allows the casting of steel strands with different strand width and possibly also different strand thickness.
  • the mold 1 is equipped with an electromagnetic device 2, such as a stirring coil or an electromagnetic brake, for influencing the flow motion of the molten steel in the liquid core of the cast steel strand.
  • To the mold 1 includes a strand guide 3, which extends to a cutting machine designed as a cutting device 4 for cutting the steel strand in slabs.
  • the cast steel strand is supported and guided on its broad side walls in a tight corset of driven and non-driven strand guide rollers 5 and redirected from a casting direction G determined by the Kokillen-Bogenradius RK in a horizontal transport direction T.
  • Groups of both sides of the steel strand arranged strand guide rollers 5 are summarized in strand guide segments 6.
  • the strand guide 3 comprises a series of successive sections with specific functions, the structure of which is essentially known.
  • the emerging from the mold 1 steel strand is transported without application of bending stresses along a circular arc with the strand guide arc radius RSt in a circular arc guide 9 and while maintaining this radius of curvature.
  • the strand guiding arc radius RSt hereby corresponds to the mold arc radius RK, as a result of which Biegebelastungsbuild transport is guaranteed.
  • a strand support with strand guide rollers 5 also takes place on the narrow sides of the steel strand.
  • subsequent straightening zone 10 is a bending back and straightening of the steel strand.
  • the steel strand is conveyed in a horizontal strand guide 11 to the dividing device 4.
  • the strand guide 3 comprises a series of successive sections with specific functions.
  • steel strand is performed and supported without applying bending stresses according to the Kokillen-Bogenradius RK.
  • a strand support with strand guide rollers 5 also takes place on the narrow sides of the steel strand.
  • a progressive bending of the steel strand from mold arc radius RK to the strand guiding arc radius RSt of the subsequent circular arc guide 9 takes place.
  • the steel strand is transported while maintaining the strand guiding arc radius. The further transport of the steel strand takes place analogously to the embodiment according to FIG. 1.
  • the cooling device 12 includes, as shown in Figures 3 and 4, between the strand guide rollers 5 positionable spray nozzles 13, which are independently adjustable in a normal plane N to the transport direction T at least in some areas.
  • height-adjustable spray nozzles 13 with associated adjusting devices 14 or, as shown in FIG. 4, spray nozzles 13 with control valves 18 for controlling the quantity of water are provided.
  • the Adjustment devices 14 or the control valves 18 are actuated by a computing unit 15.
  • the strand guide rollers in these segments can be wedge-shaped to the steel strand and thus allow a small reduction in the thickness of the metal strand and an improvement of the metallurgical properties in the core zone of the steel strand.

Abstract

L'invention concerne un procédé et un dispositif de production de brames épaisses en acier présentant une épaisseur de coulée excédentaire de 360 mm et une largeur de coulée excédentaire de 1000 mm dans une installation de coulée continue. L'invention propose des étapes de procédé et une configuration d'installation, qui même pour la coulée de barres d'acier dans une plage d'épaisseurs de 360 à 450 mm, garantissent la production de barres d'acier et de brames de haute qualité et simultanément une bonne qualité interne et une faible sensibilité à la fissuration.
PCT/EP2009/065526 2008-11-20 2009-11-20 Procédé et installation de coulée continue pour la production de brames épaisses WO2010057967A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BRPI0921942A BRPI0921942A2 (pt) 2008-11-20 2009-11-20 método e instalação de fundição contínua para fabricar placas grossas
KR1020117014204A KR101658342B1 (ko) 2008-11-20 2009-11-20 두꺼운 슬래브를 제조하기 위한 방법 및 연속 주조 플랜트
RU2011124890/02A RU2476290C1 (ru) 2008-11-20 2009-11-20 Способ и установка непрерывной разливки для изготовления толстых слябов
CN2009801466275A CN102333605B (zh) 2008-11-20 2009-11-20 用于制造厚板坯的方法和连铸设备
EP09784060.7A EP2349612B2 (fr) 2008-11-20 2009-11-20 Procédé et installation de coulée continue pour la production de brames épaisses

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1805/2008 2008-11-20
AT0180508A AT507590A1 (de) 2008-11-20 2008-11-20 Verfahren und stranggiessanlage zum herstellen von dicken brammen

Publications (1)

Publication Number Publication Date
WO2010057967A1 true WO2010057967A1 (fr) 2010-05-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/065526 WO2010057967A1 (fr) 2008-11-20 2009-11-20 Procédé et installation de coulée continue pour la production de brames épaisses

Country Status (7)

Country Link
EP (1) EP2349612B2 (fr)
KR (1) KR101658342B1 (fr)
CN (1) CN102333605B (fr)
AT (1) AT507590A1 (fr)
BR (1) BRPI0921942A2 (fr)
RU (1) RU2476290C1 (fr)
WO (1) WO2010057967A1 (fr)

Cited By (6)

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Publication number Priority date Publication date Assignee Title
WO2012139968A1 (fr) * 2011-04-13 2012-10-18 Sms Siemag Ag Procédé et installation de coulée continue verticale permettant de produire des brames épaisses à partir d'une masse de métal fondu
WO2013139491A1 (fr) * 2012-03-22 2013-09-26 Siemens Vai Metals Technologies Gmbh Dispositif et procédé de coulée continue d'une barre d'acier de grandes dimensions
CN103611903A (zh) * 2013-12-11 2014-03-05 首钢总公司 一种水电站压力容器钢用特厚板坯的连铸生产工艺
WO2018072550A1 (fr) * 2016-10-17 2018-04-26 江阴兴澄特种钢铁有限公司 Procédé de coulée continue destiné à la production d'une ébauche ultra-épaisse de 450 mm sur une machine de coulée continue à arc droit
WO2018082883A1 (fr) * 2016-11-07 2018-05-11 Primetals Technologies Austria GmbH Procédé permettant de faire fonctionner une installation mixte de laminage en coulée continue
AT522265A1 (de) * 2019-03-06 2020-09-15 Primetals Technologies Austria GmbH Umbau einer stranggiessanlage für knüppel- oder vorblockstränge

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DE102013224557A1 (de) 2013-11-29 2015-06-03 Sms Siemag Ag Stranggießanlage und Verfahren zum Stranggießen eines Metallstranges
RU2564192C1 (ru) * 2014-04-02 2015-09-27 Открытое акционерное общество "Уральский завод тяжелого машиностроения" Способ мягкого обжатия непрерывнолитой заготовки
CN104001880B (zh) * 2014-06-08 2016-05-25 山西太钢不锈钢股份有限公司 一种高锰钢直弧形板坯连铸方法
CN106141128B (zh) * 2016-06-21 2018-01-23 燕山大学 一种弧型连铸机的蠕变矫直方法
DE102017213647A1 (de) 2017-03-29 2018-10-04 Sms Group Gmbh Stranggießanlage und Verfahren zu deren Betrieb

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WO2012139968A1 (fr) * 2011-04-13 2012-10-18 Sms Siemag Ag Procédé et installation de coulée continue verticale permettant de produire des brames épaisses à partir d'une masse de métal fondu
TWI496633B (zh) * 2011-04-13 2015-08-21 Sms Siemag Ag 由金屬熔融物製造厚鋼板的方法與垂直連續鑄造裝置
WO2013139491A1 (fr) * 2012-03-22 2013-09-26 Siemens Vai Metals Technologies Gmbh Dispositif et procédé de coulée continue d'une barre d'acier de grandes dimensions
CN103611903A (zh) * 2013-12-11 2014-03-05 首钢总公司 一种水电站压力容器钢用特厚板坯的连铸生产工艺
WO2018072550A1 (fr) * 2016-10-17 2018-04-26 江阴兴澄特种钢铁有限公司 Procédé de coulée continue destiné à la production d'une ébauche ultra-épaisse de 450 mm sur une machine de coulée continue à arc droit
WO2018082883A1 (fr) * 2016-11-07 2018-05-11 Primetals Technologies Austria GmbH Procédé permettant de faire fonctionner une installation mixte de laminage en coulée continue
AT522265A1 (de) * 2019-03-06 2020-09-15 Primetals Technologies Austria GmbH Umbau einer stranggiessanlage für knüppel- oder vorblockstränge
AT522265B1 (de) * 2019-03-06 2021-12-15 Primetals Technologies Austria GmbH Umbau einer stranggiessanlage für knüppel- oder vorblockstränge

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AT507590A1 (de) 2010-06-15
CN102333605A (zh) 2012-01-25
BRPI0921942A2 (pt) 2016-01-05
KR101658342B1 (ko) 2016-09-21
KR20110085001A (ko) 2011-07-26
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CN102333605B (zh) 2013-12-11
RU2476290C1 (ru) 2013-02-27

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