WO2016165933A1 - Installation de coulée et de laminage et procédé servant à faire fonctionner ladite installation - Google Patents

Installation de coulée et de laminage et procédé servant à faire fonctionner ladite installation Download PDF

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Publication number
WO2016165933A1
WO2016165933A1 PCT/EP2016/056803 EP2016056803W WO2016165933A1 WO 2016165933 A1 WO2016165933 A1 WO 2016165933A1 EP 2016056803 W EP2016056803 W EP 2016056803W WO 2016165933 A1 WO2016165933 A1 WO 2016165933A1
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WIPO (PCT)
Prior art keywords
rolling
casting
steckel
conveying direction
plant according
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.)
Ceased
Application number
PCT/EP2016/056803
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German (de)
English (en)
Inventor
Thomas Heimann
Uwe Plociennik
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SMS Group GmbH
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SMS Group GmbH
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Filing date
Publication date
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of WO2016165933A1 publication Critical patent/WO2016165933A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B21B1/466—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 non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the invention relates to a casting-rolling plant for producing metal strips, wherein the metal strip passes through the casting-rolling plant in a conveying direction, comprising: a mold with a vertical output for producing a cast strand, at least one strand guide downstream of the mold in the conveying direction for redirecting the cast strand from the vertical to the horizontal, one of the strand guide in the conveying direction downstream Steckel mill, wherein the Steckel mill has at least one Steckel rolling mill, the at least one Steckel rolling mill in the conveying direction before the at least one Steckel rolling stand, a first furnace and a first reel is upstream and wherein the at least a Steckel roller in the conveying direction downstream of the at least one Steckel rolling stand, a second reel is downstream.
  • the invention relates to a method for operating such a casting-rolling plant.
  • a generic casting-rolling plant is known from WO 2015/014865 A1. Further similar solutions are disclosed in EP 2 580 001 B1, EP 2 667 982 B1, WO 2012/104710 A1, WO 201 1/158091 A2, WO 96/41024 A1, EP 0 662 358 A1, EP 0 947 590 B1, US Pat. No. 4,675,974 A, EP 2 670 539 B1, EP 0 937 512 A1, EP 0 535 368 B1 and EP 1 1 13 888 B1. So-called CSP systems are used in conventional embodiments as Vertical Solid Bending (VSB) systems or as Vertical Liquid Bending (VLB) systems built and operated. Such plant types are designed for productions of more than 1 million tonnes per year.
  • VSB Vertical Solid Bending
  • VLB Vertical Liquid Bending
  • Plant operators have a need for low-cost cast-rolling plants for lower production, preferably in the range of between 0.5 and 0.8 million tonnes per year, on which simple steel types can be produced, with strip thicknesses of up to 1 mm being targeted.
  • the aim is to provide a cast-rolling plant capable of producing a lower annual production of between 0.5 and 0.8 million tons per year, which should be economically possible.
  • the production of the casting plant should be so low that the subsequent rolling mill with few scaffolds manages. Helpful in this case is a low casting speed. This reduces production and thus increases the time window for the rolling process.
  • the strand cools faster and energy costs increase, which is to be avoided.
  • the invention is therefore based on the object, a generic cast-rolling device so educate that the functionality of the system can be increased, and it should be possible in particular to perform a thermomechanical rolling in a simple manner. Furthermore, a corresponding method for operating such a system is to be provided. Both the casting-rolling plant and the process are intended to allow in particular a production of strips with a relatively low production volume in an economical manner.
  • the solution of this problem by the invention is characterized in that between the at least one Steckel rolling and the second reel, a cooling section is arranged.
  • the at least one Steckel rolling mill may be downstream of the at least one Steckel rolling mill a second furnace in the conveying direction.
  • the Steckel rolling mill preferably has only a single Steckel rolling mill or two Steckel rolling stands.
  • the first furnace and / or the second furnace are preferably designed as reel ovens.
  • the Steckel mill can be downstream of another cooling section in the conveying direction.
  • the Steckel mill can be downstream in the conveying direction another reel.
  • the strand guide preferably has an upstream in the conveying direction and an adjacent, downstream in the conveying direction roller segment; It is particularly preferably provided that the two roller segments are at least largely identical. Alternatively and advantageously, it can also be provided that the strand guide has a single roller segment.
  • a separation device in particular a pair of scissors, can be arranged.
  • another furnace may be arranged; This further furnace is preferably designed as a tunnel furnace. Furthermore, the further furnace may have at least one induction heating element.
  • At least one roughing stand can furthermore be arranged.
  • the roughing stand can be made a large thickness decrease.
  • at least one further roll stand can likewise be arranged.
  • At least one descaling system can be arranged.
  • the mold is a curved funnel mold. This advantageously makes it possible to keep the strand guide as short as possible and yet not to obtain too great a bending (i.e., not too small a minimum radius of curvature of the slab) and an associated excessive elongation.
  • the strand is then deflected in the strand guide to the horizontal by (slightly) less than 90 °.
  • the strand guide without mold preferably has a maximum height of 3 m.
  • the method for operating a cast-rolling plant of the type described is characterized according to the invention in that the strip for the purpose of thermomechanical rolling in a number of rolling passes in the at least one Steckel rolling stand reversed rolled and thereby up and unwound on the first and the second reel is, wherein the band between the at least one Steckel rolling stand and the second reel is at least temporarily cooled.
  • the casting plant (Caster) preferably delivers such high temperatures in the material to be rolled that the furnace before the Steckel mill only in exceptional cases, eg. B. at low casting speeds is needed. Accordingly, a preferred embodiment of the method provides that an oven is operated in the conveying direction before the Steckel mill only when the outlet temperature of the slab from the casting machine requires it.
  • the slab When not operating the furnace, the slab is then preferably passed through this temperature insulated from the environment.
  • the furnace tunnel kiln or an inductive heating system
  • a heat hood serves in this case only as a good insulation and slab storage.
  • the proposed method is used in particular for the production of small quantities (up to approximately 0.8 million tons per year) with very high product quality and low operating costs.
  • a concept is used which satisfies the abovementioned task-oriented claims.
  • the casting plant preferably only two identical roll segments, while the rolling mill consists only of a Steckel rolling mill, with the simple grades can be produced.
  • the strand guide consists only of a single roller segment, which further minimizes the investment costs.
  • the casting plant is designed for low production, so that there is a large time window for rolling in Steckel compassion. Furthermore, relatively high temperatures are present behind the caster, so that low operating costs can be realized because a furnace downstream of the casting machine (in particular a tunnel kiln) is required only in exceptional cases, for example at low casting speeds.
  • the starting point for the present idea is a cost-effective casting plant, consisting of two construction-like roll segments with a low overall height of about 3 m and a low length system and high output temperature (about 1 .150 ° C) of the strip or slab. To ensure low production, the casting plant must not be too long. In order to achieve the required bend of 90 ° in a short plant, for example, already the funnel mold and the dip tube may be curved or inclined.
  • the strand thickness is preferably between 40 and 60 mm with a casting speed of 3.0 to 5.5 m / min.
  • the subsequent rolling mill - due to the low annual production and the high average temperature after the Caster - also be created more cost-effective. Due to the lower production, the output from the caster is so low that the reduction in thickness can take place in a Steckel mill. Optionally, for final thicknesses of up to 1 mm the Steckel rolling stand still some single scaffolds upstream or downstream.
  • a first cooling section (in particular laminar or compact cooling section) is located in front of the second plug-in furnace in order to enable thermomechanical rolling.
  • the proposed system is significantly lower and shorter than a conventional CSP system. As a result, the halls can be created much lower and therefore cheaper.
  • the plant length designates the arc length from the top of the mold to the last roll.
  • the strand guide is the part of the plant length within which the strand must be solidified, ie the roll-supported length. In the proposed system, the length of the strand guide is equal to the length of the system. As a result, substantially less heat is given off between the solidification and the kiln inlet through contact with driver, bending and straightening rollers and through heat radiation, as is the case in previously known systems or in short installations, which consist only of vertical segments.
  • Steckel mills are known as such.
  • the pre-rolled strip is hereby usually introduced under an inlet-side winding furnace and by an inlet-side driver in the reversing stand for a puncture.
  • the rolling stock is threaded into the exit-side winding furnace.
  • a predetermined strip tension is built up between the winding furnace and the reversing stand and the strip is rolled at the appropriate speed. Runs the end of the tape in the Steckel mill, the system is slowed down so that the end of the tape comes to a halt behind the nip of the reversing mill, but before the outlet side driver. During reversing, the nip is set for the next pass.
  • the outgoing driver carries this Tape to the piercing into the reversing frame.
  • the tape is threaded into the winding furnace on the inlet side.
  • the beginning of the strip comes to a standstill at the end of the second stitch between the input side driver and the reversing stand.
  • the strip advantageously no longer has to be heated up during normal operation for the aforementioned rolling process.
  • the tunnel kiln or an inductive heating system with subsequent heat hood serves in this case only as good insulation and slab storage. Only at particularly low casting speeds or after incidents, the belt must be heated. This has advantageous low operating costs result.
  • thermo-mechanical rolling can be done so that after the penultimate stitch turned on the cooling section in the Steckel mill and the strip is cooled down to the transformation temperature. For some qualities even lower temperatures are needed.
  • the tape is then reeled and then runs back through the switched-off cooling section and preferably without loss to the first reel. Enough time passes so that the belt temperature can equalize. Over the entire strip thickness, the desired target temperature is now available. After the last stitch, the belt temperature is now so low that no grain growth occurs (or at least only a small one). This results in a fine-grained microstructure with very high material qualities, as in a heavy plate rolling mill.
  • FIG. 1 shows schematically a casting-rolling plant for the production of a steel strip according to a first embodiment of the invention
  • FIG. 2 shows schematically a casting-rolling plant in the illustration according to FIG. 1 according to a second variant
  • FIG. 3 shows schematically a casting-rolling plant in the illustration according to FIG. 1 according to a third variant
  • FIG. 4 schematically shows a casting-rolling plant in the illustration according to FIG. 1 according to a fourth variant
  • FIG. 5 shows schematically a casting-rolling plant in the illustration according to FIG. 1 according to a fifth variant
  • FIG. 7 schematically shows a casting-rolling plant in the illustration according to FIG. 1 according to a seventh variant
  • FIG. 7 shows schematically a casting-rolling plant in the illustration according to FIG. 1 according to a sixth variant
  • FIG. 8 schematically shows a casting-rolling plant in the illustration according to FIG. 1 according to an eighth variant
  • a casting-rolling plant 1 for the production of a steel strip 2 can be seen.
  • the plant has a casting machine 21 in which liquid metal exits vertically from a mold 3 downwards and is deflected along a strand guide 4 from the vertical to the horizontal.
  • the material of the belt or the belt itself is conveyed in a conveying direction F through the system 1.
  • the rolling of the cast strip 2 takes place in a Steckel mill 5, which in the exemplary embodiment according to FIG. 1 has a single Steckel rolling stand 6.
  • the Steckel rolling stand 6 is preceded by a first furnace 7 and a first reel 8.
  • the Steckel rolling stand 6 are downstream of a second furnace 1 1 and a second reel 9. It is essential that between the Steckel rolling stand 6 and the second reel 9, a cooling section 10 is arranged ,
  • a first cooling section preferably laminar or compact cooling section
  • a second plug-in furnace in order to advantageously permit thermomechanical rolling.
  • higher material qualities can be achieved.
  • These Technology can also be used in conventional Steckel rolling mills to produce high-grade steel grades.
  • a first, short cooling section - consisting preferably of two reinforced cooling groups - in front of the second coiler oven has significant advantages: First, there is the possibility of thermomechanical rolling. The resulting temperature wedge between the head / foot and the middle can be compensated after each stitch. The transport path between the Steckel roller stand and the second coiler oven is shorter than if the entire cooling system were located in front of the second coiler oven. As a result, the band emits less heat by radiation. The cooling directly after the last stitch leads to a lower grain growth and to better mechanical properties or saving of expensive alloying elements with the same mechanical properties.
  • thermomechanical rolling the strip temperature is brought close to the transition temperature before the last passes, more specifically, below the recrystallization temperature but above the transition temperature. Due to the lower temperature, a higher rolling force must be applied with the same decrease in rolling, on the other hand, a grain refinement is achieved, whereby higher yield strengths and higher strengths are achieved. In addition, the grain can not grow so much after the sting due to the lower temperature. With thermomechanical rolling, one would like to achieve high decreases in the low temperature range. Overall, the decreases should be greater than 28% and at least 7% for each individual stitch.
  • thermomechanical rolling When thermomechanical rolling is used, the amount of water required to rapidly eliminate and eliminate unwanted temperature profiles must be turned on and off. In a second cooling group that is rolled Volume cooled down to the temperature required for the last stitch (s). The strip is then wound up and unwound in the second coiler oven. In the period between the end of the cooling and the previous pass, the belt temperature can be compensated so that the temperature difference between the core and the surface is as small as possible.
  • thermomechanical rolling For thermomechanical rolling, the following example is given: In 3 passes of the band through the Steckel mill 5, so in total 6 Steckelstichen, tapes with a starting thickness of 40 mm to 3.51 millimeters and with a starting thickness of 60 mm to 5.27 millimeters be rolled down. If thinner final dimensions are to be produced or the strip is to be cooled down before the last pass - as is the case in the case of thermomechanical rolling - it must be ensured that the rolling process takes no longer time than the casting.
  • the strip can also be driven several times without being taken down by the Steckel rolling mill (s); The rolling out of the coils can also start at the rear reel. This makes it possible to cool the strip down to near the transition temperature immediately after the penultimate stitch.
  • the belt then runs over the second reel without cooling and without loss through the cooling section and the Steckel rolling stands to the first reel. Then, in the case of two adjacent Steckel rolling stands, it again moves through the first scaffolding without being picked up and only receives the last stitch in the second Steckel rolling stand. In the entire time between cooling and last stitch, the strip temperature can be compensated so that a homogeneous temperature profile over the strip thickness arises.
  • the water cooling can be calculated and set to the desired Rolling temperature is reached only after the temperature compensation in the coiler oven and the radiation during transport to the Steckel rolling stand.
  • a further cooling section 12 is arranged, which then follows another reel 13.
  • a separator 14 is arranged in the form of a pair of scissors.
  • an oven 15 is arranged between the separating device 14 and the Steckel mill 5, which can serve as slab storage and in particular serves for heating in case of disturbances (for example also in the case of a low casting speed).
  • Fig. 2 solution shows a cost-effective system concept, in which no additional cooling section follows between the Steckel and the second coiler oven.
  • This concept is suitable for the production of simple material qualities that do not require thermomechanical rolling.
  • After the second coiler oven follows a cooling section 12.
  • the cooling section is designed as cooling. Otherwise, the system has only the casting machine 21, consisting of a funnel mold, which may possibly already be curved.
  • the strand guide 4 in turn has only two construction-like or structurally identical segments.
  • Behind the pair of scissors 14 and a tunnel oven 15 follows the Steckel mill 6 with the two coiler ovens 7 and 11. At the end of the system is the reel 13 for winding the coil.
  • the heating unit only needs to be used in cases of incidents, for example at very low casting speeds, for heating the slabs. Otherwise it only serves as a very good insulation.
  • tapes with a starting thickness of 40 to 60 mm can be rolled down below 2.0 millimeters. If thinner final dimensions up to 1 mm strip thickness are to be produced, it must always be ensured that the rolling process takes no longer time than the casting. It may be necessary for the Steckel rolling mill to be preceded or followed by additional stands. Alternatively, through intelligent control and control of casting speed and water cooling in the caster, alternate production of thicker and thinner belts may be run.
  • the first strip is rolled down in the Steckel mill over several passes to a small thickness. To get enough time for this, the casting speed for the following band is reduced. Due to a lower casting speed, the transport time from the caster to the kiln inlet increases and the strand temperature decreases more due to the longer heat radiation time. Since this band is colder now, it can only be rolled with smaller decreases. It may be necessary for time reasons a complete pass through the Steckelgerüst (return and flow) accounts. The next following band can now be poured faster and rolled more thinly.
  • strips with a thickness of 2 mm are produced by default, for example, alternately bands with a thickness of 1 and 5 mm can be created by alternately changing the casting speed. Depending on the desired final thickness can be on a thin two or more thick Bands follow.
  • the automation systems of the caster and the rolling mill must be linked.
  • the Steckel mill 5 is still followed by two rolling stands 17. Between 1 and 4 additional rolling stands 17 are preferably provided in this case. These rolling stands 17 are located between the end of the Steckel mill 5 and the cooling section 12. In this embodiment, no cooling section is provided in front of the second reeling furnace for the thermomechanical rolling. To produce high-grade material qualities, a first short cooling section between the Steckel stand and the second coiler oven can also be installed.
  • Fig. 4 it can be seen that the Steckel rolling mill is equipped here with two adjacent Steckel rolling stands 6. Otherwise, the system is free of other rolling stands.
  • no cooling section is provided in front of the second coiler oven for the thermomechanical rolling.
  • a first short cooling section between the second Steckelgerüst and the second coiler oven can be installed.
  • a variant of this is shown in Fig. 5.
  • no cooling section is provided in front of the second coiler oven for the thermomechanical rolling.
  • a first short cooling section between the second coiler oven and the first adjoining rolling mill can also be installed.
  • the first short cooling section can also be installed between the rolling stands, preferably before the last rolling stand.
  • an induction heating 20 inductive heating system
  • FIG. 7 The subsequent heat cap 22 serves only as good insulation, for temperature compensation and as slab storage between the casting machine and the rolling mill.
  • the overall system is very compact.
  • a Vorgerüst 16 is arranged in front of the Steckel mill 5, with which the incoming into the Steckel mill 5 band 2 can be pre-rolled.
  • Entzu mattersanlagen 18 and 19 can be arranged in front of the respective rolling mills to improve the surface of the belt 2. Due to the roughing stand 16, a decrease of up to 60% can take place in front of the first coiler oven 7, whereby strip thicknesses of up to 1 mm can be produced in a simple manner.
  • Fig. 8 a variant can be seen in such a way that the Steckel rolling stand 6 is provided as a single stand, while a Vorgerüst 16 is arranged in front of the Steckel mill 5.
  • Fig. 9 the course of the temperature of the slab or the strip 2 is applied over the distance from the mold 3, which can typically be achieved in a system according to the invention.
  • Essential here is the temperature difference between the outlet from the casting machine (1 .273 ° C) and the temperature before winding the tape (1 .182 ° C) which is only 91 ° C; This is much less than with conventional systems.
  • the upstream and downstream heating and cooling devices and the descaling can be used in all the embodiments mentioned.
  • the first short cooling section before the second coiler oven for example, in a twin Steckelgerüst used. LIST OF REFERENCE NUMBERS

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

Abstract

L'invention concerne une installation de coulée et de laminage (1) servant à fabriquer des bandes de métal (2), la bande de métal (2) traversant l'installation de coulée et de laminage (1) dans une direction de transport (F). L'installation de coulée et de laminage comprend : une coquille (3) pourvue d'une sortie verticale servant à produire un brin de coulée, au moins un système de guidage de brin (4) installé en aval de la coquille (3) dans la direction de transport (F), servant à renvoyer le brin de coulée de la verticale dans l'horizontale, un laminoir Steckel (5) installé en aval du système de guidage de brin (4) dans la direction de transport (F). Le laminoir Steckel (5) comporte au moins une cage de laminoir Steckel (6). Un premier four (7) ainsi qu'un premier treuil (8) sont montés en amont de la ou des cages de laminoir Steckel (6) dans la direction de transport (F) avant la ou les cages de laminoir Steckel (6), et un deuxième treuil (9) étant monté en aval de la ou des cages de laminoir Steckel (6) dans la direction de transport (F) derrière la ou les cages de laminoir Steckel (6). L'invention vise à améliorer la fonctionnalité de l'installation et à permettre en toute simplicité en particulier un laminage thermomécanique. L'invention prévoit à cet effet qu'une ligne de refroidissement (10) est disposée entre la ou les cages de laminoir Steckel (6) et le deuxième treuil (9). L'invention concerne par ailleurs un procédé servant à faire fonctionner une installation de coulée et de laminage de ce type.
PCT/EP2016/056803 2015-04-15 2016-03-29 Installation de coulée et de laminage et procédé servant à faire fonctionner ladite installation Ceased WO2016165933A1 (fr)

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DE102015206809 2015-04-15
DE102015206809.9 2015-04-15
DE102015210863.5 2015-06-12
DE102015210863.5A DE102015210863A1 (de) 2015-04-15 2015-06-12 Gieß-Walz-Anlage und Verfahren zu deren Betrieb

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Cited By (2)

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CN109226257A (zh) * 2018-08-17 2019-01-18 武钢集团昆明钢铁股份有限公司 一种板炉卷轧机轧制板材的方法及其生产线
CN110662614A (zh) * 2017-03-15 2020-01-07 丹尼尔和科菲森梅克尼齐有限公司 组合式连铸及金属带材热轧设备

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IT201700028732A1 (it) * 2017-03-15 2018-09-15 Danieli Off Mecc Impianto combinato di colata continua e laminazione di nastri metallici a caldo
DE102018207137A1 (de) 2018-05-08 2019-11-14 Sms Group Gmbh Gieß-Walz-Anlage, und Verfahren zu deren Betrieb
CN117102236A (zh) * 2023-09-06 2023-11-24 济钢集团国际工程技术有限公司 一种中厚板生产线及其生产方法

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CN110662614A (zh) * 2017-03-15 2020-01-07 丹尼尔和科菲森梅克尼齐有限公司 组合式连铸及金属带材热轧设备
JP2020509937A (ja) * 2017-03-15 2020-04-02 ダニエリ アンド シー．オフィス メカニケ エスピーエーＤａｎｉｅｌｉ＆Ｃ．Ｏｆｆｉｃｉｎｅ Ｍｅｃｃａｎｉｃｈｅ Ｓｐａ 結合された連続鋳造および金属ストリップ熱間圧延プラント
CN109226257A (zh) * 2018-08-17 2019-01-18 武钢集团昆明钢铁股份有限公司 一种板炉卷轧机轧制板材的方法及其生产线

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