EP0665296A1 - Verfahren und Anlage zum Herstellen warmgewalzter Stahlbänder - Google Patents

Verfahren und Anlage zum Herstellen warmgewalzter Stahlbänder Download PDF

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Publication number
EP0665296A1
EP0665296A1 EP95830018A EP95830018A EP0665296A1 EP 0665296 A1 EP0665296 A1 EP 0665296A1 EP 95830018 A EP95830018 A EP 95830018A EP 95830018 A EP95830018 A EP 95830018A EP 0665296 A1 EP0665296 A1 EP 0665296A1
Authority
EP
European Patent Office
Prior art keywords
finishing
slabs
area
rolling
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.)
Withdrawn
Application number
EP95830018A
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English (en)
French (fr)
Inventor
Corrado Rovelli
Adolfo Contaretti
Dino Azzoni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group SpA
Original Assignee
Innse Innocenti Engineering SpA
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 Innse Innocenti Engineering SpA filed Critical Innse Innocenti Engineering SpA
Publication of EP0665296A1 publication Critical patent/EP0665296A1/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets

Definitions

  • the present invention relates to a process for manufacturing hot-rolled strip steel, as well as a plant suitable to carry out said process.
  • the thin slab process has energetic advantages with respect to the conventional process, even the direct one, mainly thanks to the elimination of the roughing mill, however it must be noted that said process also gives rise to some problems caused not only by the difficulty in designing a mould suitable for thin slabs, but mainly due to a certain degeneration of the product characteristics.
  • there is a degeneration of the strip surface quality caused both by the high speeds required to obtain an adequate productivity from a thin casting, and by the problems related to the formation of particularly tenacious scale in the longitudinal furnace.
  • an object of the present invention is to provide a process that overcomes the above-mentioned drawbacks and problems of the thin slab process while maintaining the energetic advantages inherent in said process with respect to the conventional processes.
  • the first operating step of the process according to the present invention is the continuous casting of slabs having a thickness included between 80 and 120 mm. Higher thickness values would imply compactness problems of the plant, while thicknesses lower than 80 mm would present again the drawbacks, particularly the slab quality ones, already previously indicated for the thin slab process.
  • the casting speed is included between 2 and 5 m/min., whereby it is not so high as to compromise the product surface yet allowing a high productivity.
  • the outlet temperature may range from 850 to 1150°C.
  • the pre-finishing rolling to a thickness equal to or lower than 50 mm takes place, then the end shearing of the thus obtained bar, its further descaling and finally the finishing rolling to the desired thickness.
  • Figs.1 and 3 refer to a double continuous casting plant indicated by numeral 1, whose mould has plane parallel sides for thicknesses from 80 to 120 mm.
  • the mould may have variable width so as to assure greater operative flexibility, in particular combined with a tower fitted with independent revolving arms for the quick change of the mould and plunger, in order to allow the greatest compactness of the plant.
  • the mould may also be provided with an oscillator capable of varying the oscillation frequency and stroke during the casting according to the kind of steel and the casting speed.
  • An intermediate area 3 consisting in an insulated rollerway or normalization furnace is followed by an area for the alignment of the slabs, globally indicated by A, which, thanks to the relatively reduced slab length, can include a series of translating carriages 14 which are insulated or consist in lengths of a roller furnace, as shown in fig.1, in order to assure an optimum preservation of the slab temperature and a subsequent energetic saving.
  • the lateral transfer of the slabs may be achieved through a system of transverse furnaces 4', as many as the castings, in particular of the walking beam type same as the successive furnaces, indicated by numeral 4, positioned so as to feed one another in order to provide a good feeding store for the slabs.
  • the alignment area A can also include the possibility of admittance for slabs not directly coming from the continuous castings, but for example semi-hot slabs coming from an intermediate storage area.
  • area 3 in the case of fig.1 wherein the alignment in A is carried out by means of carriages 14, has a length at least equal to that of a slab, whereas this is not required in the case of fig.2.
  • area A is followed by a re-heating area, with transverse advancing, schematized by numeral 4 and consisting particularly in a walking beam furnace preferably having the inlet and the outlet on opposite sides in the transverse direction, both on a rollerway inside the furnace in order to achieve the optimum compactness of the plant and to assure the shortest permanence of the piece in free air, mostly for energetic saving reasons.
  • Said furnace 4 will preferably be internally provided with known piece transfer devices, such as to allow independent loading and unloading cycles and thus optimize the utilization of the store between casting and rolling mill.
  • said method permits to reach a high "storage" capacity between casting and rolling mill in this area, at least twenty minutes, capable of allowing the upkeep of the rolling mill productivity during the casting tools change and the absorption of the full casting productivity in case of cylinders change or short accidental stops of the rolling mill.
  • a furnace adjustment system capable of heating the slabs lengthwise in a differentiated way may be provided so as to assure the greatest uniformity and constancy of temperature of the piece being rolled. Furthermore, the previously mentioned direct admittance of slabs not directly coming from the casting may be provided at said furnace 4, as an alternative to their introduction in the slabs alignment area A immediately upstream.
  • a scarfing device 4a e.g. of the torch type, is inserted between carriages 14 of the slabs alignment area A and furnace 4.
  • a pre-finishing group 5 consisting in one or more rolling stands, whose purpose is to reduce the piece thickness from the original 80-120 mm to less than 50 mm.
  • the number of stands and their type will be selected according to the piece size, and in particular to the starting and final thicknesses.
  • Said pre-finishing group may be provided with one-way or reversible rolling, i.e. capable of inverting the piece motion so as to carry out more rolling steps with the same stand, thus reducing the number of stands installed downstream.
  • Vertical stands which are useful for various reasons, may be employed thanks to the values of the thickness entering the pre-finishing group.
  • a first reason is the possibility of calibrating the piece width by adjusting it through an automatic control system according to the desired final width.
  • Another function of the vertical stands is the mechanical breaking of the scale so as to facilitate the removal thereof by means of hydraulic systems and thus assure a better surface quality.
  • hydraulic descaling devices may be provided between the horizontal and vertical stands.
  • the entrance to the horizontal stand in case of strong thickness reductions is made easier and shaping of the piece head is made possible so as to limit the waste at the moment of the shearing, also reducing the likelihood of stoppage at the entrance guide of the finishing mill.
  • connection may be accomplished in various ways according to the different production needs.
  • three connection ways may be provided, respectively schematically illustrated in figs.3a, 3b and 3c.
  • a first way of direct connection is shown with reference to fig.3a.
  • the piece is simultaneously rolled at the pre-finishing mill and at the finishing mill, and the piece integrity is preserved by a tension adjustment system acting thereon.
  • This solution assures the greatest plant compactness and the lowest investment cost. It is shown in the layout examples of figs.1 and 2, where in both cases an induction heater 6 for the piece edges, a rotary shear 7 for the end cutting of bars having a thickness lower than 50 mm, as well as a descaler 8 are provided between the pre-finishing group 5 and the finishing rolling mill 9.
  • a second way of connection through a coil-box 15 is shown with reference to fig.3b.
  • the piece is coiled at the outlet of the pre-finishing group 5, turned over at the inlet of the finishing mill 9 and uncoiled to be rolled thereon.
  • the temperature upkeep is assured by the small exposed surface of the coiled piece.
  • This solution already known, maintains a significant compactness and allows two pieces to be simultaneously rolled respectively at the pre-finishing mill and at the finishing mill.
  • the uncoupling between the two rolling groups also allows the rolling of the piece at an optimum speed for the different steps.
  • the third type of connection i.e. the free bar type
  • fig.3c The third type of connection, i.e. the free bar type, is illustrated in fig.3c.
  • the piece leaves the pre-finishing group 5 before entering the first stand of the finishing mill 9.
  • the maintenance of the temperature is assured by insulated panels or by a small roller furnace 16.
  • the advantages of the preceding solution are still present, but the room needed is greater, since a longer layout is required.
  • the main advantage of this solution is that it allows the use of a reversible pre-finishing mill which implies the reduction of the number of finishing passes needed to obtain a certain strip thickness.
  • finishing mill 9 may be any one of the types presently known, selected according to the production required and to the purpose of assuring the highest product quality.
  • a cooling area 10 and then the downcoilers 11 are provided downstream from the finishing mill.
  • the transverse furnace provides a better homogenization of the slab temperature and allows a good ease of connection to more casting stands entering the rolling mill with a higher plant use flexibility.
  • another advantage is also the possibility of feeding to the transverse furnace semi-hot or cold slabs not directly coming from the continuous casting, said advantage being still greater for those kinds of steel that require a surface inspection and the removal of defects out of the line.
  • the discarding as scrap of material cast merely to exhaust the load in case of significant problems at the rolling mill can be avoided by diverting it to the "stores" provided in the plant.
  • the layout can be made modular in view of the increasing productivity levels planned in subsequent steps, thanks to the ease of connection to more lines, while the flexibility may even reach a possible insertion of the first portion of the process onto existing rolling mills operating according to the conventional indirect process, with apparent energetic advantages.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
EP95830018A 1994-01-26 1995-01-24 Verfahren und Anlage zum Herstellen warmgewalzter Stahlbänder Withdrawn EP0665296A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI940123A IT1269476B (it) 1994-01-26 1994-01-26 Processo ed impianto per produrre acciaio laminato a caldo in nastro
ITMI940123 1994-01-26

Publications (1)

Publication Number Publication Date
EP0665296A1 true EP0665296A1 (de) 1995-08-02

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Family Applications (1)

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EP95830018A Withdrawn EP0665296A1 (de) 1994-01-26 1995-01-24 Verfahren und Anlage zum Herstellen warmgewalzter Stahlbänder

Country Status (2)

Country Link
EP (1) EP0665296A1 (de)
IT (1) IT1269476B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0867239A2 (de) * 1997-03-24 1998-09-30 Sms Schloemann-Siemag Aktiengesellschaft Verfahren und Anlage zum Auswalzen von Warmbreitband aus stranggegossenen Brammen
WO1998056517A1 (en) * 1997-06-09 1998-12-17 Posec-Europe Limited Metal strip production
EP0908242A1 (de) * 1997-09-15 1999-04-14 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren zur Umgestaltung einer Walzanlage
US6941636B2 (en) 2001-02-26 2005-09-13 Siemens Aktiengesellschaft Method for operating a casting-rolling plant
US7143499B2 (en) * 2000-09-22 2006-12-05 Sms Demag Ag Method and installation for producing metal strips and sheets
US8011418B2 (en) 2007-08-24 2011-09-06 SMA Siemag Aktiengesellschaft Method and device for manufacturing a metal strip by means of continuous casting and rolling
ITUD20100150A1 (it) * 2010-07-21 2012-01-22 Danieli Off Mecc Apparecchiatura di mantenimento in temperatura e/o eventuale riscaldo di prodotti metallici lunghi e relativo procedimento
ITUD20100149A1 (it) * 2010-07-21 2012-01-22 Danieli Off Mecc Apparato di mantenimento in temperatura e/o eventuale riscaldo di prodotti metallici lunghi e relativo procedimento
EP3142807B2 (de) † 2014-05-13 2021-12-15 Primetals Technologies Austria GmbH Vorrichtung und verfahren zur herstellung von langen metallprodukten

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112275797B (zh) * 2020-09-03 2023-04-07 太原钢铁(集团)有限公司 消除超级奥氏体不锈钢中板表面缺陷的方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170815A (en) * 1977-05-23 1979-10-16 Chugairo Kogyo Kaisha Ltd. Method of operating a reheating furnace in hot rolling line
GB1594351A (en) * 1978-01-25 1981-07-30 G S K Steel Developments Ltd Rolling of steel strip
JPS586701A (ja) * 1981-07-07 1983-01-14 Nippon Kokan Kk <Nkk> 連続鋳造−熱間圧延設備
DE3310867A1 (de) * 1983-03-25 1984-10-04 Mannesmann AG, 4000 Düsseldorf Giesswalzanlage zum walzen von stranggiessmaterial
EP0353487A1 (de) * 1988-07-26 1990-02-07 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Anlage zum Walzen flacher Produkte
DE3908457A1 (de) * 1989-03-15 1990-09-20 Loi Ind Ofenanlagen Verfahren und anlage zum herstellen von gewalztem material aus brammen
DE4017928A1 (de) * 1990-06-05 1991-12-12 Schloemann Siemag Ag Verfahren und anlage zur herstellung von warmgewalzten baendern oder profilen aus stranggegossenem vormaterial
DE4041206A1 (de) * 1990-12-21 1992-06-25 Schloemann Siemag Ag Verfahren und anlage zur herstellung von warmgewalztem stahlband, insbesondere fuer edelstaehle aus stranggegossenem vormaterial

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170815A (en) * 1977-05-23 1979-10-16 Chugairo Kogyo Kaisha Ltd. Method of operating a reheating furnace in hot rolling line
GB1594351A (en) * 1978-01-25 1981-07-30 G S K Steel Developments Ltd Rolling of steel strip
JPS586701A (ja) * 1981-07-07 1983-01-14 Nippon Kokan Kk <Nkk> 連続鋳造−熱間圧延設備
DE3310867A1 (de) * 1983-03-25 1984-10-04 Mannesmann AG, 4000 Düsseldorf Giesswalzanlage zum walzen von stranggiessmaterial
EP0353487A1 (de) * 1988-07-26 1990-02-07 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Anlage zum Walzen flacher Produkte
DE3908457A1 (de) * 1989-03-15 1990-09-20 Loi Ind Ofenanlagen Verfahren und anlage zum herstellen von gewalztem material aus brammen
DE4017928A1 (de) * 1990-06-05 1991-12-12 Schloemann Siemag Ag Verfahren und anlage zur herstellung von warmgewalzten baendern oder profilen aus stranggegossenem vormaterial
DE4041206A1 (de) * 1990-12-21 1992-06-25 Schloemann Siemag Ag Verfahren und anlage zur herstellung von warmgewalztem stahlband, insbesondere fuer edelstaehle aus stranggegossenem vormaterial

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 079 (M - 204) 31 March 1983 (1983-03-31) *
T. KIRUMA ET AL.: "Hitachi Mini Hot Strip Mill", HITACHI REVIEW, vol. 39, no. 4, TOKYO JP, pages 195 - 200, XP000173200 *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0867239A3 (de) * 1997-03-24 1999-03-31 Sms Schloemann-Siemag Aktiengesellschaft Verfahren und Anlage zum Auswalzen von Warmbreitband aus stranggegossenen Brammen
US6071362A (en) * 1997-03-24 2000-06-06 Sms Schloemann-Siemag Aktiengesellschaft Method and plant for rolling hot-rolled wide strip from continuously cast slabs
EP0867239A2 (de) * 1997-03-24 1998-09-30 Sms Schloemann-Siemag Aktiengesellschaft Verfahren und Anlage zum Auswalzen von Warmbreitband aus stranggegossenen Brammen
KR100604111B1 (ko) * 1997-03-24 2006-09-22 에스엠에스 데마그 악티엔게젤샤프트 연속주조된슬래브로부터만들어진열간광폭스트립을압연하는방법및장치
WO1998056517A1 (en) * 1997-06-09 1998-12-17 Posec-Europe Limited Metal strip production
EP0908242A1 (de) * 1997-09-15 1999-04-14 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Verfahren zur Umgestaltung einer Walzanlage
US6199620B1 (en) 1997-09-15 2001-03-13 Danieli & C. Officine Meccaniche Spa Method to transform a rolling plant
KR100807310B1 (ko) * 2000-09-22 2008-02-28 에스엠에스 데마그 악티엔게젤샤프트 강 스트립 및 강 시트의 제조 방법 및 설비
US7143499B2 (en) * 2000-09-22 2006-12-05 Sms Demag Ag Method and installation for producing metal strips and sheets
EP1363750B2 (de) † 2001-02-26 2010-07-28 Siemens Aktiengesellschaft Verfahren zum betreiben einer giesswalzanlage
US6941636B2 (en) 2001-02-26 2005-09-13 Siemens Aktiengesellschaft Method for operating a casting-rolling plant
US8011418B2 (en) 2007-08-24 2011-09-06 SMA Siemag Aktiengesellschaft Method and device for manufacturing a metal strip by means of continuous casting and rolling
ITUD20100150A1 (it) * 2010-07-21 2012-01-22 Danieli Off Mecc Apparecchiatura di mantenimento in temperatura e/o eventuale riscaldo di prodotti metallici lunghi e relativo procedimento
ITUD20100149A1 (it) * 2010-07-21 2012-01-22 Danieli Off Mecc Apparato di mantenimento in temperatura e/o eventuale riscaldo di prodotti metallici lunghi e relativo procedimento
EP2410274A1 (de) * 2010-07-21 2012-01-25 DANIELI & C. OFFICINE MECCANICHE S.p.A. Temperaturerhaltungs- und/oder Heizvorrichtung für lange Metallprodukte und zugehöriges Verfahren
EP2410272A1 (de) * 2010-07-21 2012-01-25 DANIELI & C. OFFICINE MECCANICHE S.p.A. Temperaturerhaltungs- und/oder Heizvorrichtung für lange Metallprodukte und zugehöriges Verfahren
CN102343359A (zh) * 2010-07-21 2012-02-08 丹尼尔和科菲森梅克尼齐有限公司 用于长形金属产品的温度保持和/或可能加热装置及相关方法
US8257643B2 (en) 2010-07-21 2012-09-04 Danieli & C. Officine Meccaniche Spa Temperature maintenance and/or possible heating apparatus for long metal products and relative method
RU2561951C2 (ru) * 2010-07-21 2015-09-10 ДАНИЕЛИ энд К. ОФФИЧИНЕ МЕККАНИКЕ СПА Устройство и способ для поддержания температуры и возможного нагрева длинномерных металлических изделий
EP3142807B2 (de) † 2014-05-13 2021-12-15 Primetals Technologies Austria GmbH Vorrichtung und verfahren zur herstellung von langen metallprodukten

Also Published As

Publication number Publication date
ITMI940123A1 (it) 1995-07-26
ITMI940123A0 (it) 1994-01-26
IT1269476B (it) 1997-04-01

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