EP0909597A1 - Lingotière pour la coulée continue de brames minces - Google Patents

Lingotière pour la coulée continue de brames minces Download PDF

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Publication number
EP0909597A1
EP0909597A1 EP98101945A EP98101945A EP0909597A1 EP 0909597 A1 EP0909597 A1 EP 0909597A1 EP 98101945 A EP98101945 A EP 98101945A EP 98101945 A EP98101945 A EP 98101945A EP 0909597 A1 EP0909597 A1 EP 0909597A1
Authority
EP
European Patent Office
Prior art keywords
crystalliser
segment
casting chamber
enlargement
curved
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
EP98101945A
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German (de)
English (en)
Inventor
Andrea Carboni
Franco Lumini
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche 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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP0909597A1 publication Critical patent/EP0909597A1/fr
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • This invention refers to a crystalliser, whether it be straight or curved, for the continuous casting of thin or medium slabs as set forth in the main claim.
  • the crystalliser according to the invention is used to obtain slabs suitable for subsequent rolling to produce strip or sheet.
  • the crystalliser according to the invention serves to produce slabs from 500 to more than 3000 mm wide, with a thickness of 150 mm to 30 mm and with casting speeds of even more than 10 ⁇ 12 metres per minute.
  • the state of the art includes crystallisers for the continuous casting of thin slabs.
  • US-A-2.564.723 teaches to include a casting chamber in an intermediate position of the wide sides, the casting chamber having a surface conformed like a rhombus.
  • the casting chamber enables the nozzle to be introduced so that it can discharge the liquid metal below the meniscus.
  • EP-C-149.734 re-uses the teachings of all these prior art documents and proposes them in an organic manner to serve the same purposes.
  • JP-A-51-112730 the casting chamber is progressively reduced practically along the whole length of the ingot mold so that, at the outlet of the mold, the slab has the desired nominal measurements with the sides perfectly straight.
  • DE-A-2034762 teaches to include an ingot mold with a casting chamber which has a through development; also, to pre-roll the enlargements which are formed in the slab as it leaves the ingot mold so as to make it flat when it reaches the end of the discharge rollerway.
  • This document includes through casting chambers with constant dimensions which, however, create problems with the surface continuity of the skin due to the shrinkage thereof.
  • WO-A-89/12516 substantially includes two solutions.
  • the first solution already included in EP-A-230.886, includes a casting chamber with a rectangular plan and with the sides tapering until they reach the nominal section of the slab at an intermediate position in the length of the crystalliser.
  • the second solution includes a through casting chamber with a constant width which tapers in such a way that the sides at the centre line of the casting chamber reach the dimensions of the slab outside the ingot mold.
  • This second solution includes a long and important pre-rolling process immediately downstream of the ingot mold in order to gradually reduce the convex section.
  • This second solution does not make it possible to obtain a skin which is sufficiently smooth and without cracks, and above all it is not possible, with this solution, to proceed at present required casting speeds.
  • the purpose of the invention is to obtain a crystalliser which, starting from the teachings of US'220, will allow the geometry of the casting chamber to be standardised and reproduced so that it will be possible to guarantee optimum and repeatable quality results no matter what the speed of extraction, that is to say even when the speed is of around 12 metres per minute and more, and no matter what type of steel is cast, including peritectic steels and micro-alloy peritectic steels.
  • the casting chamber of the crystalliser according to the invention is defined by an enlargement made in at least one of the wide walls of the crystalliser in a substantially central position; the enlargement connects at the sides with two substantially straight segments.
  • the casting chamber defined by this enlargement passes through the length of the crystalliser and, in one embodiment of the invention, is progressively reduced from the inlet to the outlet.
  • Inlet means the value which the casting chamber has at a desired position around the nominal level of the meniscus of the liquid metal inside the crystalliser.
  • the substantially central enlargement, at the inlet has a width of at least 500 mm and a depth, referred to a single wide wall of the crystalliser, of between about 30 and 90 mm.
  • the substantially central enlargement has a depth, referred to a single wide wall of the crystalliser, of between about 1 and 15 mm.
  • the curves which define the geometry of the casting chamber and which connect the casting chamber to the straight segments of the wide walls of the crystalliser, both in a transverse direction to the direction of casting and also lengthwise thereto are defined by equations whose parameters are functionally correlated at least to the type of steel cast.
  • the geometry is therefore a function of the range of products, that is to say, a geometric description is determined which is the closest possible to the various optimum surfaces and obtains a characteristic configuration for a desired range of products.
  • the casting chamber is moreover wider than that of US'220 and of a greater height, so that the liquid bath and the surface of the meniscus increase though the width of the slab does not vary.
  • the substantially central enlargement around the nominal value of the meniscus at at least one of the two wide walls defining the casting chamber is made according to a curve with a sinusoidal development.
  • This sinusoidal curve is connected laterally and naturally to the straight segments of the walls whose extensions lie on the plane tangent to the sinusoidal curve.
  • the sinusoidal curve guarantees a continuous and constant dimensional progression, perfectly controlled and able to be reproduced, which prevents anomalous and uncontrolled stresses, and also the stress of the skin both during shrinkage at the time of solidification and also during the vertical and horizontal flow.
  • the central enlargement at the meniscus is progressively reduced, in a desired and controlled manner, which can be reproduced even on the machine, along the height of the crystalliser, until it assumes a desired depth and with a reduced value at the outlet of the crystalliser.
  • all the curves taken on a plane transverse to the casting direction and defining the enlargements in each section of the crystalliser are defined by sinusoidal curves characterised by a specific equation.
  • the crystalliser has a central enlargement defined, lengthwise to the crystalliser, by a first segment with a constant depth, by a second segment with a progressively decreasing depth and by a third segment with a constant depth.
  • the curved segment, taken lengthwise to the crystalliser, which connects the two enlargements with a constant depth is a sinusoidal curve.
  • the central enlargement of the crystalliser progressively decreases in depth in a longitudinal direction to the crystalliser and the terminal segment has a constant depth.
  • the curve defining the progressive reduction in the depth of the enlargement as taken lengthwise to the crystalliser is defined, according to the invention, by at least a sinusoidal curve.
  • the terminal segment with the constant depth covers a length equal to 1/4 ⁇ 1/6 of the total length of the crystalliser and includes substantially parallel walls which allow the casting to be started with the insertion of the starter bar, thus facilitating alignment and reducing the transitional heat stress.
  • the upper enlargement with the constant depth according to the invention covers a length of the crystalliser equal to about 1/9 ⁇ 1/6 of the total length.
  • the slab is taken to its final form with a drastic reduction in friction and lateral thrusts and therefore with far fewer possibilities of the skin breaking.
  • the progressive reduction, according to a sinusoidal development, of the angle which defines the progressive dimensional reduction of the casting chamber minimises the possibility of surface hollows forming on the skin of the forming slab.
  • the behaviour of the crystalliser can be predicted on the drawing board, or verified and composed experimentally and repeated indefinitely for all crystallisers, since all the curves are obtained in a descriptive manner.
  • crystallisers 10 are shown diagrammatically, and only the essential parts are shown, particularly the profile of the section of the crystalliser 10.
  • the crystalliser 10 can be made of copper or copper alloy or other material and includes chambers with circulating cooling water as are known to the state of the art.
  • the crystalliser 10 again as is known to the state of the art, is subject to longitudinal to-and-fro movements, that is, substantially along the axis of flow of the liquid metal and therefore of the slab.
  • the crystalliser 10 includes wide walls 15 and narrow walls 14.
  • the narrow walls 14 are defined by the movable sides 13 which, as they move, define the width of the slab as it leaves the crystalliser; this width can vary from about 500 mm to 3000 mm.
  • the containing means 24 define a transit section which is substantially equal to the outlet section of the terminal segment 27 of the crystalliser, and can be equipped with means to adapt them elastically to the surface of the slab in transit.
  • cooling means 25 of a type as are known to the state of the art.
  • the transverse rollers 18, in this case (Figs. 1 and 3), have a first assembly of rollers 19, which have a profile coordinated with the outlet section of the crystalliser 10, which defines a transit section which is in fact the same as the outlet section of the terminal segment 27.
  • rollers 18 then have a second assembly of rollers 28 whose profile is progressively modified so as to take the section of the slab, which leaves the crystalliser with the enlargements on the wide sides defined by the outlet section of the terminal segment 27, to have the wide sides without any enlargements and parallel, so that the slab can cooperate with the third assembly of rollers 29 which are cylindrical or possibly rounded.
  • the casting chamber 11 has a first segment 26 with a width, taken on the axis x, which is progressively and continuously reduced along the axis z, followed by a terminal segment 27 with a substantially constant section with a constant width "l".
  • the first segment 26 has at least an initial segment wherein the enlargement has a constant depth taken on the axis y; this depth is then progressively reduced until it again has a constant value in the terminal segment 27.
  • the first segment which has the enlargement with a substantially constant depth covers about 1/9 ⁇ 1/6 of the total length of the crystalliser 10, while the terminal segment 27, with a width "l", covers about 1/4 ⁇ 1/6 of the total length.
  • the first segment 26 has a depth which is progressively reduced immediately from the inlet and until the terminal segment 27 which has a constant section.
  • the casting chamber 11, in correspondence with the inlet 16 taken as around the nominal value of the meniscus 20, has a width "L”, defined by a curve 23 which constitutes the substantially central enlargement on the wide walls 15.
  • the casting chamber 11 also has a depth defined by the nominal width of the movable sides 13 to which the enlargement with the value of "2A" at the inlet 16 is added.
  • A is the value of the lateral half-enlargement at the inlet 16 to the casting chamber 11 relative to one wall of the crystalliser and measured substantially along the median plane of the crystalliser along the axis y.
  • the curve 23 defining this lateral half-enlargement, which at the inlet 16 has a maximum depth of "A", is a sinusoid defined by a specific equation.
  • the sinusoid connects at the sides with the segments 123 to the straight segments 21 of the wide walls 15 whose extensions are tangent to the sinusoid.
  • the section of the casting chamber 11 is progressively reduced, so that every transverse section of the crystalliser 10 is defined by its own enlargement described by a specific curve 23 with a sinusoidal development.
  • Fig. 4 shows the curve 23a in correspondence with the inlet 16 and the curve 23b in correspondence with the outlet 17, all the intermediate curves between the inlet 16 and the outlet 17 being defined by specific sinusoids whose parameters are functionally correlated at least to the type of steel cast and to the speed of extraction.
  • the parameters of the sinusoids are also functionally correlated to the nominal width of the movable sides 13 and/or the value of the width and/or depth of the enlargement in the relative section of the crystalliser 10.
  • the value of the enlargement "A" according to the invention can vary from about 30 to 90 mm.
  • the casting chamber 11 has a first segment 26 with a constant section, a second segment 22 with a section which is progressively reduced in width and depth, and a third segment 27, or terminal segment, with a constant section which has a width "1".
  • the connecting curved portion 223 which connects the end of the first segment 26 with the beginning of the terminal segment 27 in the case of Figs. 2 and 3, or the curved portion 223 which defines the progressive reduction of the first segment 26 in the case of Fig. 1 is, according to the invention, a sinusoid defined by a specific equation.
  • This equation has parameters which are functionally correlated at least to the speed of extraction and to the type of steel cast.
  • This equation has parameters which are functionally correlated also to the value of the initial depth A and/or the final depth B, and/or to the height of the decreasing segment 22 or 26 and/or the height of the segment 26 with constant section if present.
  • the transit section of the terminal segment 27 is constant and facilitates the extraction of the slab which leaves the crystalliser with its sides substantially parallel and with its central rounded part having a width "B" at a central position on its wide sides.
  • This value "B” is between about 1 and 15 mm.
  • connections with a sinusoidal development included at the changes in direction, both in a transverse direction between the central enlargements and the straight segments, and also in a longitudinal direction between the segment with the decreasing section and the segments with a constant section, greatly reduce the formation of surface hollows, allow a progressive and continuous adaptation to the differentiated shrinkage of the skin and minimise the formation of cracks and fissures, reducing the stress on the skin as it forms.
  • the sinusoidal connections, which guide and support the skin continuously during the progressive shrinkage caused by solidification can be reproduced perfectly on the machine and can be controlled experimentally.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP98101945A 1997-10-14 1998-02-05 Lingotière pour la coulée continue de brames minces Ceased EP0909597A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000184 IT1295512B1 (it) 1997-10-14 1997-10-14 Cristallizzatore per colata continua di bramme sottili
ITUD970184 1997-10-14

Publications (1)

Publication Number Publication Date
EP0909597A1 true EP0909597A1 (fr) 1999-04-21

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EP98101945A Ceased EP0909597A1 (fr) 1997-10-14 1998-02-05 Lingotière pour la coulée continue de brames minces

Country Status (4)

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EP (1) EP0909597A1 (fr)
AU (1) AU5388098A (fr)
ID (1) ID21154A (fr)
IT (1) IT1295512B1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6315030B1 (en) * 1999-01-13 2001-11-13 Danieli & C. Officine Meccaniche S.P.A. High speed continuous casting device and relative method
DE10121753A1 (de) * 2001-05-04 2002-11-07 Evertz Egon Kg Gmbh & Co Stranggießkokille
WO2007039484A3 (fr) * 2005-09-22 2007-06-07 Danieli Off Mecc Lingotiere de coulee de brames
CN102554152A (zh) * 2011-12-30 2012-07-11 新兴铸管股份有限公司 结晶器非正弦振动方法及其液压系统
CN102601327A (zh) * 2012-03-23 2012-07-25 中冶南方工程技术有限公司 在线连续调整结晶器宽度减少的方法
CN103014366A (zh) * 2011-09-20 2013-04-03 东北大学 一种大型电渣重熔钢锭强化冷却装置及方法
CN110198795A (zh) * 2016-11-18 2019-09-03 达涅利机械设备股份公司 用于薄板坯的连续铸造装置
CN111730033A (zh) * 2020-07-08 2020-10-02 中冶赛迪工程技术股份有限公司 一种结晶器腔形结构
DE102021215030A1 (de) 2021-12-23 2023-06-29 Sms Group Gmbh Breitseitenkokillenplatte, Stranggießkokille und Verfahren zum Herstellen einer Breitseitenkokillenplatte

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109794586B (zh) * 2019-02-27 2023-10-03 山东钢铁股份有限公司 一种适用于异形坯连铸机全保护浇铸的结晶器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012516A1 (fr) * 1988-06-16 1989-12-28 Davy (Distington) Limited Moule de coulage en continu
DE4006842A1 (de) * 1990-03-05 1991-09-12 Schloemann Siemag Ag Bandgiessanlage mit oszillierender durchlaufkokille
US5460220A (en) * 1993-02-16 1995-10-24 Danieli & C. Officine Meccaniche Spa Method of and mold for the continuous casting of thin slabs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012516A1 (fr) * 1988-06-16 1989-12-28 Davy (Distington) Limited Moule de coulage en continu
DE4006842A1 (de) * 1990-03-05 1991-09-12 Schloemann Siemag Ag Bandgiessanlage mit oszillierender durchlaufkokille
US5460220A (en) * 1993-02-16 1995-10-24 Danieli & C. Officine Meccaniche Spa Method of and mold for the continuous casting of thin slabs

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6315030B1 (en) * 1999-01-13 2001-11-13 Danieli & C. Officine Meccaniche S.P.A. High speed continuous casting device and relative method
DE10121753A1 (de) * 2001-05-04 2002-11-07 Evertz Egon Kg Gmbh & Co Stranggießkokille
WO2007039484A3 (fr) * 2005-09-22 2007-06-07 Danieli Off Mecc Lingotiere de coulee de brames
US7891406B2 (en) 2005-09-22 2011-02-22 Danieli & C. Officine Meccaniche S.P.A. Ingot mold for casting slabs
CN101272876B (zh) * 2005-09-22 2011-08-31 丹尼利&C.欧分西尼公司 用于铸造板坯的锭模
CN103014366B (zh) * 2011-09-20 2014-05-14 东北大学 一种大型电渣重熔钢锭强化冷却装置及方法
CN103014366A (zh) * 2011-09-20 2013-04-03 东北大学 一种大型电渣重熔钢锭强化冷却装置及方法
CN102554152A (zh) * 2011-12-30 2012-07-11 新兴铸管股份有限公司 结晶器非正弦振动方法及其液压系统
CN102601327A (zh) * 2012-03-23 2012-07-25 中冶南方工程技术有限公司 在线连续调整结晶器宽度减少的方法
CN102601327B (zh) * 2012-03-23 2013-11-20 中冶南方工程技术有限公司 在线连续调整结晶器宽度减少的方法
CN110198795A (zh) * 2016-11-18 2019-09-03 达涅利机械设备股份公司 用于薄板坯的连续铸造装置
CN110198795B (zh) * 2016-11-18 2021-06-01 达涅利机械设备股份公司 用于薄板坯的连续铸造装置
CN111730033A (zh) * 2020-07-08 2020-10-02 中冶赛迪工程技术股份有限公司 一种结晶器腔形结构
DE102021215030A1 (de) 2021-12-23 2023-06-29 Sms Group Gmbh Breitseitenkokillenplatte, Stranggießkokille und Verfahren zum Herstellen einer Breitseitenkokillenplatte
EP4215296A1 (fr) 2021-12-23 2023-07-26 SMS Group GmbH Plaque de lingotière à large face, lingotière de coulée continue et procédé de fabrication d'une plaque de lingotière à large face

Also Published As

Publication number Publication date
ITUD970184A1 (it) 1999-04-14
IT1295512B1 (it) 1999-05-12
AU5388098A (en) 1999-05-06
ID21154A (id) 1999-04-29

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