EP3338914A1 - Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage - Google Patents

Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage Download PDF

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Publication number
EP3338914A1
EP3338914A1 EP17154807.6A EP17154807A EP3338914A1 EP 3338914 A1 EP3338914 A1 EP 3338914A1 EP 17154807 A EP17154807 A EP 17154807A EP 3338914 A1 EP3338914 A1 EP 3338914A1
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EP
European Patent Office
Prior art keywords
strand
rolling
thin slab
hot strip
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Withdrawn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
EP17154807.6A
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German (de)
English (en)
French (fr)
Inventor
Bernd Linzer
Roman Winkler
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
Original Assignee
Primetals Technologies Austria GmbH
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 Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Priority to EP17826509.6A priority Critical patent/EP3558563A1/de
Priority to CN201780079819.3A priority patent/CN110087801B/zh
Priority to PCT/EP2017/084162 priority patent/WO2018115324A1/de
Priority to RU2019121897A priority patent/RU2750305C2/ru
Publication of EP3338914A1 publication Critical patent/EP3338914A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip 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
    • 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
    • B21B13/22—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
    • B22D11/08—Accessories for starting the casting procedure
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands

Definitions

  • the present invention relates to the technical field of cast-rolled composite plants.
  • These are plants in which a continuous casting plant for the continuous production of a steel strand with a slab format, eg thin or medium slabs, is connected directly and inline with a rolling train for hot rolling of a hot strip.
  • the hot strip is cooled after the rolling mill in a cooling section and then discharged, for example by winding the band to coils (English coils ).
  • these systems are also known, for example, under TSCR ( Thin Slab Casting and Rolling ) or Arvedi ESP systems.
  • the invention relates to endlessly operated cast-rolled composite installations in which the casting installation is designed as a thin-slab continuous casting installation ( TSER T towards S lab Endless R olling ).
  • TSER T thin-slab continuous casting installation
  • the continuous thin slab strand continuously produced in the thin slab continuous casting plant is fed directly, inline and uncut to the rolling train where it is rolled into an endless hot strip. After the rolling train, the strip is again cooled in a cooling section, then cut for the first time to a specific length or weight and wound into coils.
  • Two-roll strip casters with a downstream rolling mill are also known from the prior art. Although a two-roll strip caster is very compact and produces a strip immediately, this technology has not been able to prevail until now, since in particular medium to higher alloyed steel grades can not be reliably produced.
  • the object of the invention is to overcome the disadvantages of the prior art and to provide a method for the endless production of a hot strip of steel in a cast-rolling composite plant and a compact, favorable cast-rolling composite plant of the type mentioned, with which high quality hot strip of different steel grades (low, medium and high carbon, but also HSLA, API grades, etc.) can be produced inexpensively.
  • the Process should be extremely reliable and cause extremely low operating costs.
  • the cast-rolled composite plant according to the invention should be significantly cheaper than comparable ESP / QSP / CSP plants.
  • a simple method for starting a cast-rolling compound system should be specified so that the system can be approached quickly and reliably.
  • the aforementioned continuous casting mold is designed either straight or arcuate. However, a straight-through mold is preferred because impurities in the molten steel can be taken up by the casting powder and thus the internal quality of the thin slab strand is improved.
  • a thin-slab strand is formed with a liquid core which has a thickness of 45 to 70 mm, preferably 55 to 65 mm, and a width of 900 to 2300 mm, preferably 1100 to 1900 mm, on leaving the through-mold.
  • Thickness reduction can advantageously take place in the case of liquid (so-called liquid core redcution ) or partially liquid core (so-called soft core reduction ) of the thin-slab strand . It is noteworthy in the process according to the invention for the continuous production of a wound hot strip that, as stated in the prior art, the highest possible throughput through the continuous casting plant is advantageous, but a mean specific throughput D between 0.27 and 0.45 m 2 / min is sought. This ensures that the continuous casting plant works reliably.
  • the continuous thin slab strand is after the thickness reduction without being previously descaled or heated, ie exclusively from its casting heat out in the rolling mill through several, preferably rolled by at least three, more preferably by four, rolling passes to the hot strip with a thickness of 2.5 to 10 mm, wherein the last rolling pass takes place in the austenitic temperature range of the steel.
  • the hot strip on an austenitic structure.
  • the hot strip is cooled in the cooling section, transversely divided by the scissors and wound into coils in the winding device.
  • a control or regulating device of the continuous casting using a mathematical model an actual position of a sump tip along the transport path of the thin slab strand in the strand guide and an actual temperature profile along the transport path of the thin slab strand in the strand guide and preferably in normal planes to continuously calculated and the thin slab strand is continuously cooled, taking into account a target position of the sump tip in the strand guide, so that the actual position of the sump tip of the desired position corresponds as possible. It is advantageous if the actual position of the sump tip lies in the last third of the arcuate region of the strand guide or in the horizontal outlet region of the strand guide.
  • the temperature of the hot strip at the last pass can be accurately adjusted when the actual temperature T 1Ist of the hot strip after the last pass in the rolling line and before cooling in the cooling section is measured and the cooling of the thin slab strand in the strand guide and / or the casting speed v c is set regulated, so that the actual temperature T 1Ist a target temperature T 1Soll corresponds as possible.
  • the coiling temperature of the hot strip can be accurately adjusted when the actual temperature T 2Ist of the endless hot strip is measured after cooling in the cooling section, and Cooling nozzles of the cooling section are controlled temperature-controlled, so that the actual temperature T 2Ist a target temperature T 2Soll corresponds as possible.
  • the cold strand is introduced into the through mold either in the transport direction ( top feeding ) or counter to the transport direction of the thin slab strand ( bottom feeding ), so that it seals the mold fluid-tight.
  • a thin slab strand is formed in the continuous casting mold, which is welded to the head of the cold strand.
  • the cold strand incl.
  • the subsequent thin slab strand is then removed from the mold and supported in the strand guide and out.
  • the rolling stands against the setting for rolling a hot strip with a thickness between 2.5 and 10 mm are driven, so that the cold strand can pass through the mill without being rolled.
  • the rolling stands are started up before starting. Thereafter, the cold strand is cut off from the subsequent thin slab strand by the scissors and discharged the cold strand from the roller table between the scissors and the winding device or the winding devices. This can be done in a particularly simple manner by accelerating the cold strand by driven roller blocks and depositing it on the roller table in the transport direction behind the winding device. At least the unrolled thin slab strand is then chopped into a shredded material by the shears and the shredded material is discharged. The conveying out can take place in that the shredded material is introduced into a scrap bucket below the roller table.
  • the rolling stands are set to the thin slab strand, so that the thin slab strand is rolled into a hot strip, the hot strip is then cooled, transversely divided and wound up.
  • an arcuate section of the strand guide has a radius of curvature R of 4.5 to 6.5 m, preferably 5 to 6 m.
  • the secondary cooling has at least two spray nozzles which can be moved in a width direction of the thin slab strand at several positions within the strand guide.
  • thermal insulation panels preferably a thermal tunnel
  • the horizontal distance between two rolling stands of the rolling mill is between 3 and 6 m, in particular between 4 and 5 m, and / or the length of the cooling section between 10 and 60 m.
  • a lifting device is arranged between the pair of scissors and a pair of drive rollers, wherein the hot strip can be clamped by the drive rollers and the hot strip can be lifted by the lifting device, whereby the hot strip can be pulled away from the scissors.
  • the hot strip is first separated by the shears, then clamped in the transport direction behind the scissors hot strip by drive rollers and lifted by the lifting device. As a result, the hot strip is pulled away from the scissors, so that a collision with the subsequent hot strip is prevented.
  • the Fig. 1 schematically shows a cast-rolled composite plant according to the invention for the production of a hot-rolled hot strip of steel.
  • the liquid steel pretreated by a vacuum treatment with a hydrogen content ⁇ 1 ppm is placed in pans to the ladle turret (in Fig. 2 is shown at the top left hinged in the ladle pan 8 shown) of the continuous casting 1 transported and there formed by a G confuseer 9 in the funnel as mold Continuous mold 2 cast.
  • a thin slab strand is formed with a thin strand shell having a thickness of 55 mm and a width of 1700 mm.
  • the partially solidified thin slab strand is pulled out of the continuous casting mold 2 continuously and supported in the following strand guide 4, guided and by spray nozzles (see Fig. 4 , Reference numeral 19) of a secondary cooling further cooled.
  • the strand guide 4 has a vertical portion 4a, an arcuate portion 4b having a plurality of strand guide segments, and a horizontal portion 4c (see FIG Fig. 3 ).
  • Fig. 2 two strand guide segments 6 are shown.
  • Each strand guide segment 6 has in each case a plurality of strand guide rollers that can be hydraulically attached to the thin slab strand 3, as a result of which the thin slab strand 3 is reduced to a thickness of 45 mm.
  • the thin slab strand 3 preferably has a liquid core 5 (in what is known as a liquid core reduction ) or a partially liquid core.
  • the secondary cooling in the strand guide 4 and the casting speed v C is set by a control or regulating device 20 of the continuous casting 1, that the thin slab strand 3 solidifies at a predetermined position within the strand guide 4 (see Fig. 3 ).
  • the corresponding disclosure is hereby incorporated by reference into this application.
  • the reduced thickness, solidified, non-descaled and endless thin slab strand 3 is rolled immediately after continuous casting through four rolling stands F1 ... F4 of the rolling train 14 into a hot strip having a thickness of 3.2 mm (see the following table with the individual thickness decreases and average temperatures ).
  • the hot strip is then cooled by a cooling section 16 to winding temperature, cut by the scissors 17 and wound up by one of the winding devices 18 into coils.
  • the hot strip is cut off by the scissors 17, the hot strip section lying in the transport direction behind the scissors 17 by driver rollers (eg a pair of drive rollers 18 a of the winding devices 18) clamped and the foot of the hot strip section through the Lifting device 10 pulled away from the scissors 17.
  • driver rollers eg a pair of drive rollers 18 a of the winding devices 18
  • the hot strip coming from the rolling line 14 is chopped by the shears 17 into short sections of hot strip, e.g. carried out by means of scrap buckets 11.
  • the Fig. 3 shows the vertical portion 4a, the arcuate portion 4b and the horizontal portion 4c of the strand guide 4 of the continuous casting 1 closer. Due to the straight through mold 2 and the vertical section 4a, inclusions in the molten steel accumulate on the meniscus, these are taken up by the casting powder and used in the form of casting slag for strand lubrication.
  • the radius R of arcuate strand guide 4b is in Fig. 3 shown and is in the continuous casting machine according to the invention about 5 m.
  • the thin slab strand 3 enters immediately (ie without being descaled) after the horizontal section 4c into the first rolling stand F1 of the rolling train.
  • the figure shows how a thin slab strand 3 with a liquid core 5 leaves the continuous casting mold 2 and is reduced in thickness in the strand guide 4.
  • the thickness-reduced thin slab strand 3 is pulled out of the continuous casting mold 2 by a drawing-out device 7 designed as a pair of driven strand guiding rolls.
  • the casting speed v c is controlled by the control device 20.
  • a width-adjustable secondary cooling in the strand guide 4 is shown.
  • both narrow 3 and wide thin slab strands 3 'overcooling of the edge portions of the strand 3 is prevented by the outer two spray nozzles 19 are formed displaceable both in the width direction and normal to the strand surface.
  • the spray nozzles 19 are connected via spray nozzle holders 21, 21 'to a linear drive 22, which shifts the spray nozzles 19 in the axial direction of the linear drive 22.
  • the central spray nozzle 19 can either be fixed or as shown, also designed to be displaceable.
  • Fig. 5 is the temperature profile in ° C in the inventive production of a hot-rolled hot strip shown in a cast-rolling composite plant according to the invention; The figure corresponds to the above description and the information in Table 1.
  • the core temperature is dotted, the surface temperature is dashed and the average temperature shown in solid.
  • a grade DD11 molten steel is subjected to a vacuum treatment prior to continuous casting, whereby the hydrogen content in liquid steel is reduced to ⁇ 1 ppm.
  • a partially solidified thin slab strand 3 having a thickness of 55 mm and a width of 1700 mm is formed and reduced in thickness by a liquid core reduction to a solidified thin slab strand 3 with a thickness of 45 mm.
  • the Fig. 6a shows the lifting device 10 Fig. 1 in a not raised and in Fig. 6b in a raised state.
  • all the underlying roller table rollers - including the two liftable lifting rollers 13 - form a horizontal roller table 12.
  • the endless hot strip is cut by the scissors 17, clamped and the two lifting rollers 13 are moved upwards (see the raised state in Fig. 6b ). Since the hot strip 15 is clamped at a position behind the scissors 17, the foot of the hot strip section is pulled away from the scissors 17. This avoids a collision between the pulled-away hot strip section and the hot strip following from the rolling train 14 in a simple manner.
  • FIGS. 7a to 7e schematically show the process steps when starting a cast-rolled composite plant according to the invention.
  • the Fig. 7a shows the cast-rolled composite plant before the start of casting the continuous casting.
  • the continuous casting mold 2 is sealed in a fluid-tight manner by a cold strand 30 which comprises a cold strand head 31 and a link chain 32.
  • the cold strand 30 is pulled out of the cooled continuous casting mold 2 by driver rolls 18a in the transport direction T.
  • the cold strand head 31 welded to the subsequent thin slab strand 3 (see Fig. 7b ), wherein the thin slab strand 3 is supported by the strand guide 4 (usually of strand guide rollers of a strand guide segment 6), guided and further cooled by a secondary cooling.
  • Fig. 7b the cold leg 30 is already largely pulled out of the continuous casting 1. Since the cold strand 30 is substantially colder and harder than the following thin slab strand 3, the rolling stands F1 ... F4 of the rolling train 14 are in an ascended state, so that the cold strand 30 can pass the rolling train 14 without being rolled. This prevents damage to the work rolls of the rolling stands F1 ... F4 prevented.
  • Fig. 7c the cold strand 30 has already passed the rolling train 14 and the cooling section 16 and was cut off from the thin slab strand 3 by the scissors 17.
  • the cold strand 30 was separated from the scissors 17 by driven rollers 33 and driver rollers.
  • the cold strand 30 was stored by driven rollers 33 behind the drive rollers 18a of the winding device 18 on a roller table 12.
  • the casting speed v C of the continuous caster 1 has been increased and the thin slab strand 3 is reduced in thickness by the strand guide 4, whereby a wedge-shaped wedge piece 34 is formed.
  • the unrolled thin slab strand 3 and the wedge piece 34 are chopped by the scissors 17 and the shredded material from the roller table 12 between the scissors 17 and the
  • the rolling stands F1 to F4 of the rolling train 14 are now employed gradually to the thickness-reduced thin slab strand 3 and the thin slab strand 3 rolled into a hot strip 15.
  • the time is shown, in which the first rolling mill F1 is made to the thickness-reduced thin slab strand 3.
  • the rolling stands F2 to F4 are still passed unrolled.
  • the equipment of the invention is significantly simpler since it is e.g. only a single pair of scissors 17 needed and gets along completely without Entzunderer.
  • the start-up of the cast-rolling composite plant is much easier.
  • the manufactured hot strip 15 is excellently suitable as a precursor for classic cold rolling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
EP17154807.6A 2016-12-22 2017-02-06 Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage Withdrawn EP3338914A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17826509.6A EP3558563A1 (de) 2016-12-22 2017-12-21 Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage
CN201780079819.3A CN110087801B (zh) 2016-12-22 2017-12-21 用于在铸轧复合设备中连续制造卷绕的热轧带钢的方法
PCT/EP2017/084162 WO2018115324A1 (de) 2016-12-22 2017-12-21 Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage
RU2019121897A RU2750305C2 (ru) 2016-12-22 2017-12-21 Способ бесконечного изготовления смотанной горячекатаной полосы в комбинированной установке для разливки и прокатки, способ пуска комбинированной установки для разливки и прокатки и комбинированная установка для разливки и прокатки

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16206350 2016-12-22

Publications (1)

Publication Number Publication Date
EP3338914A1 true EP3338914A1 (de) 2018-06-27

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Application Number Title Priority Date Filing Date
EP17154807.6A Withdrawn EP3338914A1 (de) 2016-12-22 2017-02-06 Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage
EP17826509.6A Pending EP3558563A1 (de) 2016-12-22 2017-12-21 Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage

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Application Number Title Priority Date Filing Date
EP17826509.6A Pending EP3558563A1 (de) 2016-12-22 2017-12-21 Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage

Country Status (4)

Country Link
EP (2) EP3338914A1 (ru)
CN (1) CN110087801B (ru)
RU (1) RU2750305C2 (ru)
WO (1) WO2018115324A1 (ru)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112276029A (zh) * 2020-11-05 2021-01-29 中冶京诚工程技术有限公司 圆坯连铸系统及连铸方法
CN115415489A (zh) * 2022-09-05 2022-12-02 东北大学 一种铝/铝合金薄板坯连铸装备及工艺

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Publication number Priority date Publication date Assignee Title
EP3769862A1 (de) * 2019-07-24 2021-01-27 Primetals Technologies Austria GmbH Verfahren zur herstellung eines tiefziehbaren fertigbands aus stahl in einer giess-walz-verbundanlage
CN111570517B (zh) * 2020-04-15 2022-03-08 武汉钢铁有限公司 一种薄板坯连铸连轧生产热成型钢的卷取控制方法
CN113664038B (zh) * 2021-08-19 2023-06-27 中冶赛迪装备有限公司 热轧板带连轧机短流程布置结构

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