EP1676658B1 - Stahlstranggiessanlage für Knüppel- und Vorblockformate - Google Patents

Stahlstranggiessanlage für Knüppel- und Vorblockformate Download PDF

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Publication number
EP1676658B1
EP1676658B1 EP04030926A EP04030926A EP1676658B1 EP 1676658 B1 EP1676658 B1 EP 1676658B1 EP 04030926 A EP04030926 A EP 04030926A EP 04030926 A EP04030926 A EP 04030926A EP 1676658 B1 EP1676658 B1 EP 1676658B1
Authority
EP
European Patent Office
Prior art keywords
slab
strand
section
length
cross
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.)
Not-in-force
Application number
EP04030926A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1676658A1 (de
Inventor
Adalbert Roehrig
Franz Kawa
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 Concast AG
Original Assignee
Concast AG
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
Priority to PT04030926T priority Critical patent/PT1676658E/pt
Application filed by Concast AG filed Critical Concast AG
Priority to AT04030926T priority patent/ATE392280T1/de
Priority to ES04030926T priority patent/ES2304578T3/es
Priority to DE502004006866T priority patent/DE502004006866D1/de
Priority to SI200430773T priority patent/SI1676658T1/sl
Priority to PL04030926T priority patent/PL1676658T3/pl
Priority to EP04030926A priority patent/EP1676658B1/de
Priority to RU2007128951/02A priority patent/RU2388572C2/ru
Priority to UAA200708664A priority patent/UA90879C2/ru
Priority to MX2007006949A priority patent/MX2007006949A/es
Priority to CN2005800453833A priority patent/CN101137454B/zh
Priority to KR1020077013312A priority patent/KR101247154B1/ko
Priority to JP2007548712A priority patent/JP4890469B2/ja
Priority to CA2588521A priority patent/CA2588521C/en
Priority to BRPI0519311-7A priority patent/BRPI0519311A2/pt
Priority to PCT/EP2005/013078 priority patent/WO2006072311A1/de
Priority to MYPI20055950A priority patent/MY138306A/en
Priority to TW094146255A priority patent/TWI290071B/zh
Publication of EP1676658A1 publication Critical patent/EP1676658A1/de
Priority to HR20070220A priority patent/HRP20070220B1/xx
Priority to TNP2007000205A priority patent/TNSN07205A1/fr
Priority to ZA200704241A priority patent/ZA200704241B/xx
Priority to NO20072606A priority patent/NO20072606L/no
Priority to EGNA2007000663 priority patent/EG24634A/xx
Priority to US11/771,784 priority patent/US7631684B2/en
Priority to MA30068A priority patent/MA29146B1/fr
Application granted granted Critical
Publication of EP1676658B1 publication Critical patent/EP1676658B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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 invention relates to a steel continuous casting plant for billet and bloom formats according to the preamble of claim 1.
  • Corners of the mold cavity of tube molds are rounded by fillets.
  • the incipient solidification of the strand just below the bath level in the mold runs at straight portions of the mold cavity circumference different from the groove areas.
  • the heat flow at the straight or substantially straight sections is quasi one-dimensional and follows the law of heat transmission through a flat wall.
  • the heat flow in the rounded corners is two-dimensional and it follows the law of heat transfer through a curved wall.
  • the resulting strand shell is usually thicker in the corner areas at the beginning of solidification below the bath level than on the straight surfaces and begins to shrink earlier and more strongly in time.
  • the strand shell in the corner regions of the mold wall rises in an irregular manner after only about 2 seconds and air gaps are formed, which drastically worsen the heat transfer.
  • This degradation of heat transfer not only delays further shell growth, it may even come to a remelting of already solidified inner layers of the strand shell.
  • This rocking of the heat flow - cooling and reheating - leads to strand defects such as surface and internal longitudinal cracks at the edges or in edge near areas, as well as shape errors such as rhomboid, recoveries etc.
  • a re-melting of the strand shell or larger longitudinal cracks can also lead to breakthroughs.
  • Out JP-A-11 151555 is a mold for the continuous casting of billets and billets known.
  • the fillets are specially shaped as so-called corner cooling parts.
  • the Eckkühlmaschine are formed as circular recesses in the mold wall, which shrink in strand direction and revert to Kokillenausgang back to a Eckarhlkehle. The degree of curvature of the circular recesses increases in the strand running direction towards the mold outlet. This shaping is intended to ensure uninterrupted contact between the corner region of the strand shell and the specially shaped corner cooling parts of the mold.
  • the invention is based on the object, a Stahlstranggiesshiel for billets and billets preferably with a substantially rectangular or rechteckähnlichem To create strand cross-section, which achieves a combination of the following sub-goals.
  • it is intended to ensure a high casting performance with the smallest possible strand number and thus minimum investment and maintenance costs as well as an improved strand quality on the other hand.
  • the improvement of the strand quality is intended in particular to prevent strand defects in the corner regions such as cracks, solidification defects and casting powder inclusions in the strand shell, but also dimensional deviations such as skew, bulges and retractions.
  • the continuous casting plant according to the invention is intended to reduce further investment and maintenance costs for supporting frameworks and, in addition, to improve the cost-effectiveness and strand quality in the use of mold stirring devices.
  • strand quality is also improved in many ways.
  • the strand shell growth over the strand circumference and over predetermined parts of the mold length is made uniform, whereby the strand structure improves and strand defects such as cracks, etc. are prevented in the edge regions .
  • geometric strand defects such as Spiesskantmaschine, bulges, etc. can be reduced or eliminated. The enlargement of the corner fillets but also influences the flow conditions in the bathroom mirror area.
  • the boundary between a strand support-free and a reduced in their support width and support length support guide in the secondary cooling zone is determined by numerous parameters, in particular the bulging behavior of a cast strand.
  • the Hauptparametem format size and total length of the fillets of the two a strand side associated Hohlkehlbogen or the length of a straight section between the two a strand side associated Hohlkehlbogen are also the casting speed, mold cavity length, steel temperature and steel analysis, etc. authoritative.
  • the following guide values are proposed for tests to determine the boundary between a support-free secondary cooling zone and a reduced support guide in the secondary cooling zone.
  • strand formats smaller than about 150 x 150 mm 2 and a total length of the two fillets of a strand side of about 70% and more of the strand side dimension, as a rule, casting can be done without support.
  • a support guide reduced in its support width and support length may be located in the secondary cooling zone.
  • the bulging behavior of the strand after leaving the mold can be influenced so that opposite
  • the prior art significantly larger strand formats even at higher casting speeds without support or with reduced support guide can be produced.
  • Cove fillets in the peripheral line of the cavity section can be made of circular lines, compound circular lines, etc. Additional benefits are achievable if the Hohlkehlbogen not tangentially or punctiform connect to the straight sections of the perimeter. According to a further proposal, a course of curvature can be selected along the Hohlkehlbogens on to a maximum degree of curvature 1 / R on and from this swells again. The maximum degree of curvature 1 / R in the direction of strand running following Hohlkehlbogen can steadily or discontinuously decrease.
  • the circumferential lines of the strand cross-section have fillets with curves of curvature that follow a mathematical function and which decrease to a maximum degree of curvature 1 / R and decrease again therefrom, such as mathematical Functions like super circle or superelipse.
  • the substantially rectangular cavity section consists of four arcuate lines each enclosing about one fourth of the cross-sectional circumference and the arcuate lines follow a mathematical function.
  • the mathematical function x A n + y B n 1 For example, this condition satisfies when an exponent "n" of between 3 and 50, preferably between 4 and 10, is selected.
  • a and B are the dimensions of the arc line.
  • the circumferential line of the strand cross-section may also be composed of a plurality of arc lines, wherein the groove arch have a curvature which corresponds to a mathematical function, eg
  • n
  • n follows.
  • Sections of the perimeter line disposed between the fillets may have slightly curved arc lines as shown in FIG EP Patent 0 498 296 is described. Seen in strand direction, the degrees of curvature 1 / R of both the fillet arc and the lying between these relatively elongated arc lines can shrink so that at least on a partial length of the mold, the strand shell is slightly deformed when passing over the entire circumference, ie stretched.
  • an optimal mold length can be determined. Casting formats between 120 x 120 mm 2 and 160 x 160 mm 2 can be optimally cast at high casting speeds with a mold length of approx. 1000 mm, omitting strand support.
  • Fig. 1 flows through a spout nozzle 2 of an intermediate vessel 3 liquid steel in the vertical direction of a mold 4.
  • the mold 4 has a rectangular mold cavity for a billet cross-section of, for example, 120 ⁇ 120 mm 2 . 5, a partially solidified strand with a strand shell 6 and a liquid core 7 is shown.
  • a height-adjustable electromagnetic stirring device 8 is shown schematically outside the mold 4. It can also be arranged inside the mold 4, for example in the water jacket. The stirring device 8 generates a horizontally rotating rotational movement in the bathroom mirror area and in the liquid swamp.
  • a strand support-free first secondary cooling zone which is provided with spray nozzles 9.
  • Fig. 2 is equipped with 10 a mold cavity of a mold tube 11 with groove fillet 12, 12 ', 13, 13' in the corner areas.
  • the fillet 14, 15 of the fillet arc 12, 12 ', 13, 13' is in this example each about 20% of a side length 16 of the strand cross-section.
  • the degree of curvature 1 / R of the inflow side fillet arc 12, 13 is different from the degree of curvature 1 / R of the fillet arc 12 ', 13' at the mold exit.
  • the size of the fillet 14, 15 also contributes to the fact that, despite the high casting speed, the partially solidified strand can be passed through the secondary cooling zone immediately after leaving the mold cavity without or with reduced strand support.
  • a given format can be reduced by an increase in the fillets 14, 15 targeted a straight section 17 between the fillets 14, 15 so that harmful bulges of the strand shell despite strand support-free secondary cooling zone can be avoided.
  • a strand support reduced in its support width can be provided.
  • a corner 19 of a mold cavity is shown on an enlarged scale.
  • Five chamfers 23-23 "" represent the geometry of the corner formation in the sense of height curves.
  • the connection points of the chamfered sheets 23-23 "" to the straight sections 24-24 “" of circumferential lines of the chill cross section can be along the lines R, R 4 or R 1 , R 4 are selected.
  • the distances 25-25 "in this example show a continuous taper along the straight sidewalls
  • the fillets 23-23”” are defined by a mathematical curve function
  • n
  • the fillet arc 23 "" is a circular arc in this example.
  • Fig. 4 For a clear overview, only three circumferential lines following each other in line running direction are shown with fillet arc 51 - 51 "of a square mold cavity 50.
  • the circumferential lines are composed of four fillet curves 51 - 51" which enclose an angle of 90 °.
  • Fig. 5 shows a tube mold 62 for continuously casting billet or billet molds with a mold cavity 63.
  • the cross-section of the mold cavity 63 is square at the mold exit and between adjacent sidewalls 64-64 '"corner areas 65-65'" are arranged.
  • the chamfers 67, 68 are not circular lines but curves, according to the mathematical function
  • n
  • the upper Kokillenteil are on a partial length of 40% - 60% of the Kokillenine the side walls 64 - 64 '"between the corners 65 - 65'" concave. On this part length, an arc height 66 decreases in line running direction.
  • a convex strand shell forming in the mold is smoothed along the upper part length of the mold.
  • the arcuate line 70 may be formed from a circle, a composite circle, or a curve based on a mathematical function.
  • the straight side walls 71 of the mold are provided with a mold cavity conicity corresponding to the shrinkage of the strand cross-section.
  • All mold cavities in the Fig. 1-5 are provided for simplicity with a straight longitudinal axis.
  • the invention is also applicable to molds with curved longitudinal axis for Kreisbogenstranggiessanlagen.
  • the inventive embodiment of the mold cavity is not limited in the rest on pipe molds. It is also applicable to Ptatten- or block molds, etc.
  • Fig. 6 is half of a substantially rectangular strand cross-section 60 with a solidified strand shell 61 and a liquid core 42 shown.
  • the circumferential line of the half strand cross-section 60 is composed of two partial curves 45, which enclose an angle of 90 °, whose shape corresponds to the starting cross-section of the mold cavity of the mold.
  • each fillet 44 of the part curves 45 is 50%, or both fillets 44 together correspond to 100% of the strand side mass 66.
  • Arrows 48 indicate the ferrostatic pressure acting on the strand shell 61.
  • the sum of the two fillets 44 of the partial curves 45 are greater than 70% of the strand side mass 66 and a strand support in the secondary cooling zone is thus not required in this example.
  • Fig. 7 is opposite Fig. 6 the circumferential line of the half strand cross section of two circular arc 75 with a fillet 76 of 30% and straight sections 77 of 40% of the strand side mass 78 composed.
  • the straight portions 77 between the circular arcs 75 in this example are greater than 30% of the strand side mass 78, and a support guide in the form of support rollers 79 reduced in its support width and support length can be arranged.
  • a support roller width that corresponds to the length of the straight section or is slightly shorter than this is sufficient.
  • Arrows 79 indicate the ferrostatic pressure acting on the strand shell 71.
  • FIG. 8 an example of a Vorblockstranges is shown in the form of a Vorprofiles 80 for a double-T-carrier.
  • a mold cavity for pre-profiles 80 has corners 86 which are rounded with chamfers 81.
  • a strand side measure 82 is composed of two fillet arc 81 with fillets 83 of, for example, 40% and a substantially straight section 84 of, for example, 20%.
  • the indicated by arrows 85 ferrostatic pressure on the strand shell 86 produced in double-T-carrier strands according to the prior art, a bulge, if not, as in this example, by special measures shaping by a choice of corresponding chamfers 81 or a corresponding support guide is arranged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Metal Rolling (AREA)
  • Forging (AREA)
EP04030926A 2004-12-29 2004-12-29 Stahlstranggiessanlage für Knüppel- und Vorblockformate Not-in-force EP1676658B1 (de)

Priority Applications (25)

Application Number Priority Date Filing Date Title
AT04030926T ATE392280T1 (de) 2004-12-29 2004-12-29 Stahlstranggiessanlage für knüppel- und vorblockformate
ES04030926T ES2304578T3 (es) 2004-12-29 2004-12-29 Instalacion de colada continua de acero para formatos de palanquillas y desbastes.
DE502004006866T DE502004006866D1 (de) 2004-12-29 2004-12-29 Stahlstranggiessanlage für Knüppel- und Vorblockformate
SI200430773T SI1676658T1 (sl) 2004-12-29 2004-12-29 Naprava za kontinuirano litje jekla za formate gredic in bloomov
PL04030926T PL1676658T3 (pl) 2004-12-29 2004-12-29 Urządzenie do ciągłego odlewania stali dla formatów wstępniaków i wlewków kwadratowych
EP04030926A EP1676658B1 (de) 2004-12-29 2004-12-29 Stahlstranggiessanlage für Knüppel- und Vorblockformate
PT04030926T PT1676658E (pt) 2004-12-29 2004-12-29 Instalação de vazamento contínuo de aço para formatos de barras e blocos
BRPI0519311-7A BRPI0519311A2 (pt) 2004-12-29 2005-12-07 instalaÇço de lingotamento contÍnuo de aÇo para formatos de tarugo e bloco
MX2007006949A MX2007006949A (es) 2004-12-29 2005-12-07 Instalacion de colada continua de acero para formatos de palanquillas y desbastes.
CN2005800453833A CN101137454B (zh) 2004-12-29 2005-12-07 用于钢坯规格和初轧坯规格的连续铸钢设备
KR1020077013312A KR101247154B1 (ko) 2004-12-29 2005-12-07 빌릿 및 블룸 포맷용 강 연속 주조 장치
JP2007548712A JP4890469B2 (ja) 2004-12-29 2005-12-07 ビレットおよびブルーム形状用連続鋳鋼装置
RU2007128951/02A RU2388572C2 (ru) 2004-12-29 2005-12-07 Установка непрерывной разливки для сортовых или блюмовых заготовок
UAA200708664A UA90879C2 (ru) 2004-12-29 2005-12-07 установка непрерывной разливки для сортовых или блюмовых стальных заготовок
PCT/EP2005/013078 WO2006072311A1 (de) 2004-12-29 2005-12-07 Stahlstranggiessanlage für knüppel- und vorblockformate
CA2588521A CA2588521C (en) 2004-12-29 2005-12-07 Continuous steel casting installation for billet and bloom formats
MYPI20055950A MY138306A (en) 2004-12-29 2005-12-16 Continuous steel casting plant for billets and blooms
TW094146255A TWI290071B (en) 2004-12-29 2005-12-23 Steel continuous casting plant for billet and cogged ingot formats
HR20070220A HRP20070220B1 (en) 2004-12-29 2007-05-15 Continuous steel casting installatin for billet and bloom formats
TNP2007000205A TNSN07205A1 (en) 2004-12-29 2007-05-24 Continuous steel casting installation for billet and bloom formats
ZA200704241A ZA200704241B (en) 2004-12-29 2007-05-24 Continuous steel casting installation for billet and bloom formats
NO20072606A NO20072606L (no) 2004-12-29 2007-05-24 Kontinuerlig stalstopingsinstallasjon for emne- og blokkformater
EGNA2007000663 EG24634A (en) 2004-12-29 2007-06-25 Continuous steel casting installation for billet and bloom formats
US11/771,784 US7631684B2 (en) 2004-12-29 2007-06-29 Continuous casting plant
MA30068A MA29146B1 (fr) 2004-12-29 2007-07-12 Installation de coulee continue d'acier pour des formats billettes et blooms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04030926A EP1676658B1 (de) 2004-12-29 2004-12-29 Stahlstranggiessanlage für Knüppel- und Vorblockformate

Publications (2)

Publication Number Publication Date
EP1676658A1 EP1676658A1 (de) 2006-07-05
EP1676658B1 true EP1676658B1 (de) 2008-04-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04030926A Not-in-force EP1676658B1 (de) 2004-12-29 2004-12-29 Stahlstranggiessanlage für Knüppel- und Vorblockformate

Country Status (25)

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US (1) US7631684B2 (xx)
EP (1) EP1676658B1 (xx)
JP (1) JP4890469B2 (xx)
KR (1) KR101247154B1 (xx)
CN (1) CN101137454B (xx)
AT (1) ATE392280T1 (xx)
BR (1) BRPI0519311A2 (xx)
CA (1) CA2588521C (xx)
DE (1) DE502004006866D1 (xx)
EG (1) EG24634A (xx)
ES (1) ES2304578T3 (xx)
HR (1) HRP20070220B1 (xx)
MA (1) MA29146B1 (xx)
MX (1) MX2007006949A (xx)
MY (1) MY138306A (xx)
NO (1) NO20072606L (xx)
PL (1) PL1676658T3 (xx)
PT (1) PT1676658E (xx)
RU (1) RU2388572C2 (xx)
SI (1) SI1676658T1 (xx)
TN (1) TNSN07205A1 (xx)
TW (1) TWI290071B (xx)
UA (1) UA90879C2 (xx)
WO (1) WO2006072311A1 (xx)
ZA (1) ZA200704241B (xx)

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EP2127783B1 (en) * 2008-05-30 2011-04-06 Abb Ab A continuous casting device
AU2010211605A1 (en) * 2009-02-09 2011-08-25 Toho Titanium Co., Ltd. Titanium slab for hot rolling produced by electron-beam melting furnace, process for production thereof, and process for rolling titanium slab for hot rolling
EP2263815B1 (de) * 2009-06-03 2015-10-07 Concast Ag Kokille zum Stranggiessen von Vorprofilen, insbesondere Doppel-T-Vorprofilen
CN102198494A (zh) * 2011-05-09 2011-09-28 上海亚新冶金设备有限公司 一种新型矩形铸坯断面
JP5732382B2 (ja) * 2011-12-28 2015-06-10 三島光産株式会社 連続鋳造鋳型
KR101467945B1 (ko) * 2013-07-11 2014-12-03 전북대학교산학협력단 필터 내장형 주사기
JP6427945B2 (ja) * 2014-05-09 2018-11-28 新日鐵住金株式会社 ブルームの連続鋳造方法
WO2016013186A1 (ja) * 2014-07-24 2016-01-28 Ｊｆｅスチール株式会社 鋼の連続鋳造方法
WO2016114208A1 (ja) * 2015-01-15 2016-07-21 新日鐵住金株式会社 鋳片の連続鋳造方法
CN107653362A (zh) * 2017-09-19 2018-02-02 鲁东大学 一种400系不锈钢钢锭钢坯皮下裂纹消除的工艺方法

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Also Published As

Publication number Publication date
HRP20070220A2 (en) 2007-07-31
KR20070086125A (ko) 2007-08-27
CA2588521A1 (en) 2006-07-13
JP2008525199A (ja) 2008-07-17
BRPI0519311A2 (pt) 2009-01-06
CN101137454B (zh) 2010-05-26
ES2304578T3 (es) 2008-10-16
US7631684B2 (en) 2009-12-15
RU2388572C2 (ru) 2010-05-10
EG24634A (en) 2010-03-10
PL1676658T3 (pl) 2008-09-30
TWI290071B (en) 2007-11-21
PT1676658E (pt) 2008-07-28
EP1676658A1 (de) 2006-07-05
MY138306A (en) 2009-05-29
ZA200704241B (en) 2008-09-25
TW200631694A (en) 2006-09-16
HRP20070220B1 (en) 2011-12-31
SI1676658T1 (sl) 2008-10-31
TNSN07205A1 (en) 2008-11-21
ATE392280T1 (de) 2008-05-15
JP4890469B2 (ja) 2012-03-07
WO2006072311A1 (de) 2006-07-13
UA90879C2 (ru) 2010-06-10
KR101247154B1 (ko) 2013-03-29
DE502004006866D1 (de) 2008-05-29
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