EP2796224B1 - Stranggiessanlage - Google Patents

Stranggiessanlage Download PDF

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Publication number
EP2796224B1
EP2796224B1 EP12860513.6A EP12860513A EP2796224B1 EP 2796224 B1 EP2796224 B1 EP 2796224B1 EP 12860513 A EP12860513 A EP 12860513A EP 2796224 B1 EP2796224 B1 EP 2796224B1
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EP
European Patent Office
Prior art keywords
loosed
frame
rolls
fixed
slab
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.)
Active
Application number
EP12860513.6A
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English (en)
French (fr)
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EP2796224A4 (de
EP2796224A1 (de
Inventor
Min-Chul Shin
Il-Sin Bae
Seong-Yeon Kim
Sang-Hyeon Lee
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.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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Publication of EP2796224A4 publication Critical patent/EP2796224A4/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing

Definitions

  • the present disclosure relates to a continuous casting machine including a mold and segments guiding a strand, and more particularly, to a continuous casting machine in which the number and distance of rolls of outer frames are set to be different from those of rolls of inner frames for producing slabs having improved quality.
  • molten steel is continuously supplied to a mold having a predetermined shape, and a slab semi-solidified in the mold is continuously drawn from a lower side of the mold.
  • Document KR 2010 0087479 A discloses a method and a device for reducing segregation in a continuous casting machine.
  • EP 2 038 082 A1 discloses a process for continuous casting of slabs or other metal products of elongate cross-section in which a molten metal is poured into a cooled mold.
  • FIG. 1 is a schematic view illustrating the structure and segments of a general continuous casting machine.
  • the continuous casting machine includes: ladles 10 in which molten steel refined through a steel making process is poured; a tundish 20 temporarily storing the molten steel supplied from the ladles 10 through a nozzle; a mold 30 receiving the molten steel from the tundish 20 for primarily solidifying the molten steel to have a predetermined shape; and a strand guide 40 including a plurality of segments 50 arranged below the mold 30 to guide and cool a slab not fully solidified.
  • the segments 50 are arranged in such a manner that a plurality of rolls 52 and 54 face each other.
  • Each of the segments 50 includes: upper and lower frames 51 and 53 spaced apart from each other in a vertical direction; a plurality of tie rods (not shown) vertically connecting the upper and lower frames 51 and 53; and a plurality of hydraulic cylinders (not shown) using the tie rods as pistons to control gaps between the upper and lower frames 51 and 53 for applying depressive force to a slab.
  • molten metal contained in the mold 30 has to be maintained at a constant level during a casting process.
  • the level of molten metal contained in the mold 30 may be markedly varied. In this case, the rate of casting may not be further increased.
  • a slab having a high temperature may periodically swell between the rolls 52 and 54 of the segments 50 due to pressure, and thus mold level hunting may occur.
  • An aspect of the present disclosure may provide a continuous casting machine configured to reduce mold level hunting caused by periodic pressure-induced swelling of a high-temperature slab passing between rolls during a high-speed casting process.
  • An aspect of the present disclosure may also provide a continuous casting machine for producing slabs having improved quality by reducing mold level hunting caused by periodic swelling of the slabs.
  • the present disclosure provides segments and a continuous casting machine as described below.
  • a continuous casting machine may include: a mold providing a slab; and a plurality of segments configured to guide the slab through a strand guide and cool the slab, wherein each of the segments may include an inner frame, an outer frame spaced apart from the inner frame, and a plurality of rolls disposed on the inner and outer frames through roll supports, and the number N fixed of the rolls disposed on the outer frame may be set to be different from the number N loosed of the rolls disposed the inner frame so as to reduce mold level hunting caused by a slab shape.
  • the outer frame has an average roll pitch P avg,fixed different from an average roll pitch P avg,loosed of the inner frame.
  • the inner frame and the outer frame may have the same segment length so as to be disposed in a horizontal or vertical zone of the strand guide.
  • the number N loosed of the rolls disposed the inner frame may be greater than the number N fixed of the rolls disposed on the outer frame (N fixed ⁇ N loosed ).
  • the inner frame and the outer frame may include pinch rolls, respectively, so as to draw the slab passing therebetween, and centers of the pinches of the inner frame and the outer frame are not aligned.
  • the outer frame may be a fixed frame, and the inner frame may be a loosed frame that is movable.
  • the segments of the present disclosure may prevent mold level hunting caused by periodic pressure-induced swelling of a high-temperature slab passing between rolls.
  • the continuous casting machine of the present disclosure may produce slabs having improved quality by reducing mold level hunting caused by periodic swelling of the slabs.
  • FIG. 3 is a schematic view illustrating a segment 150 used in a horizontal or vertical zone of a strand guide, according to an embodiment of the present disclosure.
  • the segment 150 includes: a loosed frame 151, an inner frame loosely and movably disposed on an upper side and facing the center of curvature of the strand guide; and a fixed frame 154, an outer frame fixed to a lower side to face outward in a radial direction of the strand guide.
  • a plurality of rolls 152 and 155 are arranged on the loosed frame 151 and the fixed frame 154.
  • the rolls 152 and 155 include a pair of pinch rolls 153 and 156.
  • the rolls 152 are arranged at regular intervals along an overall segment length l seg,loosed of the loosed frame 151, and the number of the rolls 152 is N loosed .
  • the rolls 152 are arranged on the loosed frame 151 with a constant pitch P loosed .
  • the pinch roll 153 has a diameter slightly different from that of the rolls 152, gaps l loosed between the rolls 152 are substantially equal.
  • the rolls 155 are arranged at regular intervals on an overall segment length l seg,fixed of the fixed frame 154, and the number of the rolls 155 is N fixed .
  • the rolls 155 are arranged on the fixed frame 154 with a constant pitch P fixed .
  • the pinch roll 156 has a diameter slightly different from that of the rolls 155, gaps l fixed between the rolls 156 are substantially equal.
  • the number of the rolls 155 of the fixed frame 154 is greater than the number of the rolls 152 of the loosed frame 151. Therefore, the centers of the rolls 152 of the loosed frame 151 are located between the centers of the rolls 155 of the fixed frame 154.
  • the segment length l seg,loosed of the loosed frame 151 and the segment length l seg,fixed of the fixed frame 154 are equal so that the segment 150 may be disposed on a horizontal or vertical zone.
  • the P avg,loosed of the loosed frame 151 is greater than the P avg,fixed of the fixed frame 154 (P avg,loosed >P avg,fixed ).
  • the pinch rolls 153 and 156 of the rolls 152 and 155 used to draw a slab passing through the segment 150 may not be aligned at centers thereof.
  • the reason for this is as follows: in a high-speed casting process, the influence of shearing caused by misaligned centers of the pinch rolls 153 and 156 is low, but mold level hunting is severe if the pinch rolls 153 and 155 are aligned to periodically correspond to each other.
  • high-speed casting refers to casting having a rate of 400 mm•m/min or greater (for example, a slab weighing 80 metric tons is produced at a rate of 5 m/min or greater).
  • FIG. 4 illustrates a segment 160 configured to be used in a bow zone of a strand guide 140.
  • the segment 160 includes: a loosed frame 161 loosely and movably disposed to face the center of the vow zone; and a fixed frame 164 disposed at a side opposite to the loosed frame 161.
  • a plurality of rolls 162 and 165 are arranged on the loosed frame 161 and the fixed frame 165, and the rolls 162 and 164 include a pair of pinch rolls 163 and 166.
  • the rolls 161 are arranged at regular intervals on the overall segment length l seg,loosed of the loosed frame 161, and the number of the rolls 162 is N loosed .
  • the rolls 162 are arranged on the loosed frame 161 with a constant pitch P loosed .
  • the pinch roll 163 has a diameter slightly larger than that of the rolls 162, gaps l loosed between the rolls 162 are substantially equal.
  • the rolls 165 are arranged at regular intervals on the overall segment length l seg,fixed of the fixed frame 164, and the number of the rolls 165 is N fixed .
  • the rolls 165 are arranged on the fixed frame 164 with a constant pitch P fixed .
  • the pinch roll 166 has a diameter slightly larger than that of the rolls 165, gaps l fixed between the rolls 165 are substantially equal.
  • the segment 160 of the embodiment shown in FIG. 4 is used in a bow zone.
  • the bow zone of the strand guide 140 (refer to FIG. 5 ) is curved with a curvature of radius (r), and the segment length l seg,loosed of the loosed frame 161 is different from the segment length l seg,flxed of the fixed frame 164 disposed at a side opposite to the loosed frame 161.
  • the segment length l seg,loosed of the loosed frame 161 is shorter than the segment length l seg,fixed of the fixed frame 164. Therefore, if the number N fixed of the rolls 165 of the fixed frame 164 is shorter than the number N loosed of the rolls 162 of the loosed frame 161, the difference between the average pitches may be increased, and thus mold level hunting caused by the shape of a slab may be effectively prevented.
  • FIG. 5 illustrates the continuous casting machine 100 including a plurality the segments 150 and 160 according to an embodiment of the present disclosure.
  • the continuous casting machine 100 includes: ladles 110 in which molten steel refined through a steel making process is poured; a tundish 120 temporarily storing the molten steel supplied from the ladles 110 through a nozzle; a mold 130 receiving the molten steel from the tundish 20 for primarily solidifying the molten steel to have a predetermined shape; and the strand guide 140 including the segments 150 and 160 arranged below the mold 30 to perform a series of forming processes on a slab not fully solidified while cooling the slab.
  • the number N loosed of the rolls 152 and 162 of the loosed frames 151 and 161 is greater than the number N fixed of the rolls 155 and 165 of the fixed frames 154 and 164 (N loosed > N fixed ), and thus the average pitch of the rolls 155 and 165 of the fixed frames 154 and 164 is greater than the average pitch of the rolls 152 and 162 of the loosed frames 151 and 161 (P avg, loosed ⁇ P avg, fixed .
  • mold level hunting caused by the shape of a slab may be reduced, and thus the quality of the slab may be improved.
  • the number N loosed of the rolls 152 and 162 of the loosed frames 151 and 161 of the segments 150 and 160 is greater than the number N fixed of the rolls 155 and 165 of the fixed frames 154 and 164 of the segments 150 and 160 (N loosed > N fixed ) in both bow and horizontal zones 141 and 142 of the strand guide 140.
  • the segments 150 and 160 arranged in the bow zone of the strand guide 140 may be configured such that the number N loosed of the rolls 152 and 162 of the loosed frames 151 and 161 is greater than the number N fixed of the rolls 155 and 165 of the fixed frames 154 and 164 (N loosed > N flxed ), and the segments 150 and 160 arranged in the horizontal zone of the strand guide 140 may be configured such that the number N loosed of the rolls 152 and 162 of the loosed frames 151 and 161 is smaller than the number N fixed of the rolls 155 and 165 of the fixed frames 154 and 164 (N loosed ⁇ N fixed ).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (5)

  1. Stranggussmaschine mit:
    einer Gussform, die eine Bramme bereitstellt; und
    mehreren Segmenten (150), die dazu ausgelegt sind, die Bramme durch eine Strangführung zu leiten und die Bramme abzukühlen,
    wobei jedes der Segmente (150) einen Innenrahmen, einen vom Innenrahmen beabstandeten Außenrahmen und mehrere Walzen (152, 155) aufweist, die am Innen- und Außenrahmen über Walzenlagerungen angeordnet sind, und
    die Anzahl Nfixed der Walzen (155), die am Außenrahmen angeordnet sind, anders angesetzt ist als die Anzahl Nloosed der Walzen (152), die am Innenrahmen angeordnet sind, um eine durch eine Brammenform verursachte Gussformniveauschwankung zu reduzieren, wobei der Außenrahmen einen mittleren Walzenabstand Pavg, fixed hat, der sich vom mittleren Walzenabstand Pavg, loosed des Innenrahmens unterscheidet,
    wobei der Außenrahmen eine Segmentlänge hat, die größer ist als diejenige des Innenrahmens, und der Außen- und Innenrahmen in einer Bogenzone der Strangführung angeordnet sind,
    wobei der mittlere Walzenabstand Pavg, fixed des Außenrahmens und der mittlere Walzenabstand Pavg, loosed des Innenrahmens die folgende Formel erfüllen: P avg , loosed P acg , fixed = 1 − t slab r * N fixed N loosed
    Figure imgb0005
    worin sich tslab auf eine Brammendicke bezieht, und sich r auf einen Krümmungsradius der Strangführung bezieht.
  2. Stranggussmaschine nach Anspruch 1, wobei der Innenrahmen und der Außenrahmen dieselbe Segmentlänge haben, um in einer horizontalen oder vertikalen Zone der Strangführung angeordnet zu sein.
  3. Stranggussmaschine nach Anspruch 1, wobei die Anzahl Nloosed der Walzen (152), die am Innenrahmen angeordnet sind, größer ist als die Anzahl Nfixed der Walzen (155), die am Außenrahmen angeordnet sind (Nfixed<Nloosed).
  4. Stranggussmaschine nach Anspruch 1, wobei der Innenrahmen und der Außenrahmen jeweils Andruckwalzen (153, 156) aufweisen, um die zwischen diesen durchlaufende Bramme zu ziehen, und Mitten der Andruckvorrichtungen des Innenrahmens und des Außenrahmens nicht ausgerichtet sind.
  5. Stranggussmaschine nach Anspruch 1, wobei der Außenrahmen ein feststehender Rahmen (154) ist, und der Innenrahmen ein loser Rahmen (151) ist, der beweglich ist.
EP12860513.6A 2011-12-19 2012-12-18 Stranggiessanlage Active EP2796224B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020110137468A KR101360552B1 (ko) 2011-12-19 2011-12-19 연주 설비
PCT/KR2012/011091 WO2013094972A1 (ko) 2011-12-19 2012-12-18 연주 설비

Publications (3)

Publication Number Publication Date
EP2796224A1 EP2796224A1 (de) 2014-10-29
EP2796224A4 EP2796224A4 (de) 2015-12-30
EP2796224B1 true EP2796224B1 (de) 2017-08-09

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ID=48668794

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EP12860513.6A Active EP2796224B1 (de) 2011-12-19 2012-12-18 Stranggiessanlage

Country Status (5)

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EP (1) EP2796224B1 (de)
KR (1) KR101360552B1 (de)
CN (1) CN103998160B (de)
RU (1) RU2586378C2 (de)
WO (1) WO2013094972A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT519390B1 (de) * 2016-12-13 2020-09-15 Primetals Technologies Austria GmbH Verfahren und Vorrichtung zum Regeln einer Stranggießanlage
KR102158988B1 (ko) 2018-12-27 2020-09-23 주식회사 에이프로젠케이아이씨 연주설비용 특수강 합금 및 그로 이루어진 연주설비용 롤

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Publication number Priority date Publication date Assignee Title
JP3008821B2 (ja) * 1994-07-29 2000-02-14 住友金属工業株式会社 薄鋳片の連続鋳造方法および装置
KR100241404B1 (ko) * 1995-07-20 2000-03-02 이구택 턴디쉬노즐의 제어방법 및 그 장치
JPH11320059A (ja) * 1998-05-06 1999-11-24 Sumitomo Metal Ind Ltd 連続鋳造装置
KR100499623B1 (ko) * 1998-12-24 2005-09-26 주식회사 하이닉스반도체 내부 명령신호 발생장치 및 그 방법
JP3305675B2 (ja) * 1999-04-09 2002-07-24 住友金属工業株式会社 薄鋳片連続鋳造の鋳造終了方法
JP2005199302A (ja) * 2004-01-15 2005-07-28 Jfe Steel Kk 連続鋳造方法
AT414221B (de) * 2004-06-09 2006-10-15 Voest Alpine Ind Anlagen Stranggiessanlage und verfahren zum wahlweisen giessen eines breiten metallstranges oder maximal zweier demgegenüber schmälerer metallstränge
ITMI20051764A1 (it) * 2005-09-22 2007-03-23 Danieli Off Mecc Processo e impianto per la produzione di nastro metallico
AT503526B1 (de) * 2006-04-25 2008-07-15 Voest Alpine Ind Anlagen Spritzdüsen-verstelleinrichtung
CA2645094C (fr) * 2006-07-07 2013-03-26 Rotelec Procede de coulee continue de produits metalliques plats a brassage electromagnetique et installation de mise en oeuvre
JP4948375B2 (ja) * 2007-11-30 2012-06-06 新日鉄エンジニアリング株式会社 連続鋳造用ガイドロールセグメント
KR101149294B1 (ko) * 2009-01-28 2012-05-25 현대제철 주식회사 연속 주조설비의 편석 방지방법 및 그 장치
CN201855931U (zh) * 2010-11-18 2011-06-08 马鞍山钢铁股份有限公司 异型坯连铸二冷区冷却装置

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Also Published As

Publication number Publication date
EP2796224A4 (de) 2015-12-30
WO2013094972A1 (ko) 2013-06-27
EP2796224A1 (de) 2014-10-29
CN103998160B (zh) 2016-01-20
KR20130070237A (ko) 2013-06-27
KR101360552B1 (ko) 2014-02-11
CN103998160A (zh) 2014-08-20
RU2586378C2 (ru) 2016-06-10
RU2014129463A (ru) 2016-02-20

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