EP2158985B1 - Stranggiessverfahren für stahl - Google Patents

Stranggiessverfahren für stahl Download PDF

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Publication number
EP2158985B1
EP2158985B1 EP08740581.7A EP08740581A EP2158985B1 EP 2158985 B1 EP2158985 B1 EP 2158985B1 EP 08740581 A EP08740581 A EP 08740581A EP 2158985 B1 EP2158985 B1 EP 2158985B1
Authority
EP
European Patent Office
Prior art keywords
molten steel
excitation coil
mold
electromagnetic
supplied
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
EP08740581.7A
Other languages
English (en)
French (fr)
Other versions
EP2158985A4 (de
EP2158985A1 (de
Inventor
Masayuki Kawamoto
Nobuhiro Okada
Masahito Hanao
Kouji Takatani
Kozo Ota
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
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 Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Priority to PL08740581T priority Critical patent/PL2158985T3/pl
Publication of EP2158985A1 publication Critical patent/EP2158985A1/de
Publication of EP2158985A4 publication Critical patent/EP2158985A4/de
Application granted granted Critical
Publication of EP2158985B1 publication Critical patent/EP2158985B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring

Definitions

  • the present invention relates to a method of continuous casting of steel that employs an electromagnetic coil capable of selectively activating electromagnetic braking or electromagnetic stirring, while controlling the flow of in-mold molten steel.
  • FIG. 2 is a schematic sectional view of a fluid state of molten steel within a mold in this typical continuous casting.
  • Molten steel 2 which is discharged from a outlet port la of an immersion nozzle 1, collides against a solidifying shell 2c on a narrow side 3a of a mold 3. After contact with the solidifying shell 2c on the narrow side 3a, the molten steel separates into an upward flow 2a and a downward flow 2b. The upward flow 2a then forms a horizontal flow below the meniscus and moves in the direction of the immersion nozzle 1.
  • Reference Numeral 4 in FIG. 2 shows a mold powder.
  • Control of the flow of molten steel in the mold is of the utmost importance in the operation and quality control of cast slabs.
  • There are various methods for achieving flow control of molten steel such as improving the shape of the immersion nozzle, or applying an electromagnetic force to the molten steel in the mold.
  • methods of applying an electromagnetic force to the molten steel have come to be widely used.
  • Electromagnetic braking and electromagnetic stirring each have their advantages and disadvantages, but generally speaking, electromagnetic braking is used in high-speed casting, and electromagnetic stirring is used in low-speed casting.
  • Electromagnetic brakes and electromagnetic stirrers are both equipped with an electromagnetic core which has an iron core wound with a coil. The iron core is typically disposed at the back side of a copper plate of a mold. Devices which have these electromagnetic coils typically have a single function, either electromagnetic braking or electromagnetic stirring.
  • the dual-purpose coil of Patent References 1 and 2 selectively causes electromagnetic braking or electromagnetic stirring to act on molten steel in a mold, by supplying direct or alternating current to an electromagnetic coil disposed on the outer periphery of the mold.
  • Patent References 1 and 2 enables the use of both electromagnetic braking and electromagnetic stirring, which was heretofore impossible.
  • the problem to be solved by the present invention is that in the case of a dual-purpose coil capable of functioning both as an electromagnetic brake and as an electromagnetic stirrer, it was not clear how to apply electrical current during continuous casting of steel, as disclosed by the applicant.
  • the method of continuous casting of steel according to an embodiment of the present invention is a method that specifies a mode for applying current to a dual-purpose coil.
  • the method may include the acts of:
  • constituent carbon concentration of the molten steel supplied to the mold is at least 0.07% and 0.16% or less in terms of mass percentage:
  • constituent carbon concentration of the molten steel supplied to the mold is greater than 0.0050% and less than 0.07% in terms of mass percentage:
  • constituent carbon concentration of the molten steel supplied to the mold is 0.0050% or less in terms of mass percentage:
  • the method of continuous casting of steel it is possible to stably produce cast slabs with good surface quality, even with varying types of steel and casting conditions. Further, in the embodiment of the present invention, the occurrence of break-out can be controlled and a stable casting operation can be achieved.
  • the present invention specifies a mode for applying a current to a dual-purpose coil according to the composition of the molten steel and the amount of molten steel supplied when performing continuous casting of steel using a dual-purpose coil that is capable of serving both functions of electromagnetic braking and electromagnetic stirring.
  • FIG. 1 illustrates the preferred embodiments of the present invention and a process from its initial conception of the present invention to its solution of the problems of the prior art.
  • the inventors have studied how to selectively apply electromagnetic braking or electromagnetic stirring to casting conditions when performing continuous casting of steel using a dual-purpose coil as described in Patent Reference 2.
  • Electromagnetic braking may have the effect of reducing longitudinal cracks caused by uneven solidifying of molten steel, and inhibiting re-melting of the solidifying shell to thereby control the occurrence of break-out.
  • electromagnetic braking reduces the flow velocity of the molten steel that is discharged from the immersion nozzle, so that the flow velocity of the molten steel is lower when it collides against the solidifying shell.
  • electromagnetic stirring has the effect of preventing surface defects in cast slabs by increasing the flow velocity of the molten steel below the meniscus by adding a flow of molten steel that is parallel to the solidifying shell, thereby preventing air bubbles and inclusions from being trapped in the solidifying shell.
  • the present inventors conducted investigations in which when selectively applying electromagnetic braking or electromagnetic stirring according to the casting conditions, they varied the concentration of carbon, a basic component of steel, and the amount of molten steel supplied to the mold which is determined by the casting speed and the sectional area of the mold.
  • the reason that the amount of molten steel supplied is specified, instead of setting the casting speed as a parameter, is that the amount of molten steel discharged from the immersion nozzle is a primary parameter of molten steel flow in the mold, and thus, the amount of molten steel supplied is a more appropriate parameter than the casting speed for determining the method of controlling the flow of molten steel.
  • Molten steel was cast having the compositions given in Table 1 below using a vertical-curved mold continuous caster capable of producing slabs having a width of 1500 mm and a thickness of 270 mm.
  • FIG. 1 shows a dual-purpose coil used in casting, and its typical dimensions.
  • Reference Numeral 5 represents two dual-purpose coils arranged continuously on respective wide sides 3b of a mold 3. As illustrated in FIG. 1 , two magnetic polar iron core 5a are provided with first excitation coil 5b and these two teeth are further united by second excitation coil 5c.
  • Reference Numeral 5d is a core, the upper end of which is at the same height as the meniscus, and Reference Numeral 6 is a back-up plate installed on the outer side of the mold 3.
  • steel in the type A group was a low-carbon aluminum-killed steel having a carbon concentration greater than 0.0050% and less than 0.07% in terms of mass percentage.
  • type A steel uneven solidifying did not readily occur, and when the slabs were checked for surface defects, the rate of occurrence was not high. Therefore, even at a high molten steel supply rate of 5.7 ton/min, casting could be carried out, even without activating conventional electromagnetic braking or electromagnetic stirring (Comparative Example 23).
  • Steel in the type B group was a ultra low carbon steel having a carbon concentration of 0.0050% or less in terms of mass percentage. Although, generally speaking, in type B steel uneven solidifying did not readily occur, the rate of occurrence of surface defects in the slabs was extremely high. When electromagnetic stirring or electromagnetic braking was not activated, surface defects occurred in the slabs even if the amount of molten steel supplied was less than 5 ton/min ( See Comparative Example 24), and if the amount of molten steel supplied was 5 ton/min or greater, surface defects frequently occurred in the slabs ( See Comparative Example 25).
  • Steel in the type C group was a hypoperitectic steel having a carbon concentration of 0.07% or higher and 0.16% or less in terms of mass percentage. In type C steel, uneven solidifying readily occurs, and the occurrence of surface defects was low. Using steel in the type C group, when electromagnetic braking or electromagnetic stirring was not activated, if the amount of molten steel supplied was 4 ton/min or greater, longitudinal cracks and re-melting occurred, and the rate of occurrence of break-out was extremely high ( See Comparative Examples 27 and 28).
  • the rate of occurrence of break-out could be reduced by activating electromagnetic stirring when the amount of molten steel supplied was less than 3 ton/min ( See Working Example 17), and by activating electromagnetic braking when the amount of molten steel supplied was 3 ton/min or greater ( See Working Examples 9-12 and 18).
  • the alternating current does not have to be 3-phase, but it can have a higher number of phases, as long as the current phase difference is from between about 90° to about 120°.
  • the present invention described above can be applied to continuous casting using a curved mold, a vertical mold, or any mold shape, as long as it involves continuous casting. Moreover, the present invention can be applied not only to continuous casting of slabs, but also to continuous casting of blooms.

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

Claims (4)

  1. Verfahren des Stranggießens eines Stahls, das eine Art des Anlegens von Strom an eine elektromagnetische Doppelfunktionsspule (5) angibt, wobei das Verfahren Folgendes umfasst:
    Anordnen von mindestens zwei elektromagnetischen Doppelfunktionsspulen (5) in gleicher Anzahl am Außenumfang einer breiten Seite (3b) einer Gussform (3) für eine Gesamtheit von (2n + 2) am Außenumfang der breiten Seite (3b) der Gussform (3), wobei n eine natürliche Zahl ist, wobei jede der elektromagnetischen Doppelfunktionsspule (5) zwei magnetische polare Eisenkerne (5a) und eine erste Erregerspule (5b) umfasst, die um einen Außenumfang von jedem magnetischen polaren Eisenkern (5a) gewickelt ist, und wobei eine zweite Erregerspule (5c) um den Außenumfang der zwei magnetischen polaren Eisenkerne (5a) gewickelt ist, sodass die zwei magnetischen polaren Eisenkerne (5a) zusammengewickelt sind;
    Anlegen, im Fall von elektromagnetischem Rühren, eines Mehrphasen-Wechselstroms auf die Erregerspulen (5b, 5c) von allen elektromagnetischen Spulen (5), wobei der Mehrphasen-Wechselstrom mindestens 3 Phasen hat, wobei jede Phase eine Phasendifferenz von zwischen 90 ° bis 120° hat;
    Anlegen, im Fall von elektromagnetischem Bremsen, eines Gleichstroms auf die zweite Erregerspule (5c) oder auf die ersten Erregerspulen (5b), die um die zwei magnetischen polaren Eisenkerne (5a) und die zweite Erregerspule (5c) gewickelt sind, und
    selektives Aktivieren des elektromagnetischen Bremsens oder des elektromagnetischen Rührens gemäß der Zusammensetzung der Stahlschmelze (2) und der bereitgestellten Menge der Stahlschmelze (2).
  2. Verfahren des Stranggießens eines Stahls nach Anspruch 1, wobei, wenn die Bestands-Kohlenstoffkonzentration der Stahlschmelze (2), die der Gussform (3) bereitgestellt ist, mindestens 0,07 % und 0,16% oder weniger in Bezug auf den Massenprozentsatz ist:
    1) ein Mehrphasen-Wechselstrom aus 3 Phasen oder mehr an die erste Erregerspule (5b) und die zweite Erregerspule (5c) angelegt wird, wodurch verursacht wird, dass elektromagnetisches Rühren auf die Stahlschmelze (2), die in der Gussform (3) angeordnet ist, einwirkt, wenn die Stahlschmelze (2) mit weniger als 3 ton/min bereitgestellt wird, und
    2) ein Gleichstrom auf die erste Erregerspule (5b) und zweite Erregerspule (5c) angelegt wird, um zu verursachen, dass elektromagnetisches Bremsen auf die Stahlschmelze (2), die in der Gussform (3) angeordnet ist, einwirkt, wenn die Stahlschmelze (2) mit 3 ton/min oder mehr bereitgestellt wird.
  3. Verfahren des Stranggießens eines Stahls nach Anspruch 1, wobei, wenn die Bestands-Kohlenstoffkonzentration der Stahlschmelze (2), die der Gussform (3) bereitgestellt ist, größer als 0,0050 % und weniger als 0,07 % in Bezug auf den Massenprozentsatz ist:
    1) ein Mehrphasen-Wechselstrom aus 3 Phasen oder mehr an die erste Erregerspule (5b) und die zweite Erregerspule (5c) angelegt wird, um zu verursachen, dass elektromagnetisches Rühren auf die Stahlschmelze (2), die in der Gussform (3) angeordnet ist, einwirkt, wenn die Stahlschmelze (2) mit weniger als 4 ton/min bereitgestellt wird, und
    2) ein Gleichstrom auf die erste Erregerspule (5b) und zweite Erregerspule (5c) angelegt wird, um zu verursachen, dass elektromagnetisches Bremsen auf die Stahlschmelze (2), die in der Gussform (3) angeordnet ist, einwirkt, wenn die Stahlschmelze (2) mit 4 ton/min oder mehr bereitgestellt wird.
  4. Verfahren des Stranggießens eines Stahls nach Anspruch 1, wobei, wenn die Bestands-Kohlenstoffkonzentration der Stahlschmelze (2), die der Gussform (3) bereitgestellt ist, 0,0050% oder weniger in Bezug auf den Massenprozentsatz ist:
    1) ein Mehrphasen-Wechselstrom aus 3 Phasen oder mehr an die erste Erregerspule (5b) und die zweite Erregerspule (5c) angelegt wird, um zu verursachen, dass elektromagnetisches Rühren auf die Stahlschmelze (2), die in der Gussform (3) angeordnet ist, einwirkt, wenn die Stahlschmelze (2) mit weniger als 5 ton/min bereitgestellt wird, und
    2) ein Gleichstrom auf die erste Erregerspule (5b) und zweite Erregerspule (5c) angelegt wird, um zu verursachen, dass elektromagnetisches Bremsen auf die Stahlschmelze (2), die in der Gussform (3) angeordnet ist, einwirkt, wenn die Stahlschmelze (2) mit 5 ton/min oder mehr bereitgestellt wird.
EP08740581.7A 2007-06-28 2008-04-17 Stranggiessverfahren für stahl Not-in-force EP2158985B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08740581T PL2158985T3 (pl) 2007-06-28 2008-04-17 Sposób ciągłego odlewania stali

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007170578A JP4967856B2 (ja) 2007-06-28 2007-06-28 鋼の連続鋳造方法
PCT/JP2008/057511 WO2009001609A1 (ja) 2007-06-28 2008-04-17 鋼の連続鋳造方法

Publications (3)

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EP2158985A1 EP2158985A1 (de) 2010-03-03
EP2158985A4 EP2158985A4 (de) 2016-07-13
EP2158985B1 true EP2158985B1 (de) 2018-09-19

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EP08740581.7A Not-in-force EP2158985B1 (de) 2007-06-28 2008-04-17 Stranggiessverfahren für stahl

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EP (1) EP2158985B1 (de)
JP (1) JP4967856B2 (de)
KR (1) KR101154055B1 (de)
CN (1) CN101678446B (de)
BR (1) BRPI0812965B1 (de)
ES (1) ES2694707T3 (de)
PL (1) PL2158985T3 (de)
WO (1) WO2009001609A1 (de)

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JP4968020B2 (ja) * 2007-11-28 2012-07-04 住友金属工業株式会社 鋼の連続鋳造時における鋳込み初期の運転方法
JP5029324B2 (ja) * 2007-11-28 2012-09-19 住友金属工業株式会社 鋼の連続鋳造方法
JP5387070B2 (ja) * 2008-09-30 2014-01-15 Ｊｆｅスチール株式会社 連続鋳造におけるブレークアウト検出方法及び装置、該装置を用いた鋼の連続鋳造方法、ブレークアウト防止装置
JP2010221283A (ja) * 2009-03-25 2010-10-07 Jfe Steel Corp 連続鋳造におけるブレークアウト検出方法及び装置、該装置を用いた鋼の連続鋳造方法、ブレークアウト防止装置
RU2520891C2 (ru) * 2010-03-10 2014-06-27 ДжФЕ СТИЛ КОРПОРЕЙШН Способ непрерывной разливки стали и способ производства стального листа
IT1401311B1 (it) 2010-08-05 2013-07-18 Danieli Off Mecc Processo e apparato per il controllo dei flussi di metallo liquido in un cristallizzatore per colate continue di bramme sottili
JP5825215B2 (ja) * 2012-07-24 2015-12-02 新日鐵住金株式会社 鋼の連続鋳造方法
WO2014034658A1 (ja) * 2012-08-29 2014-03-06 新日鐵住金株式会社 電磁攪拌装置及び連続鋳造方法
WO2019216222A1 (ja) * 2018-05-08 2019-11-14 日本製鉄株式会社 電磁攪拌装置
JP7247777B2 (ja) * 2018-06-22 2023-03-29 日本製鉄株式会社 鋼の連続鋳造方法
CN110000368A (zh) * 2019-05-20 2019-07-12 湖南中科电气股份有限公司 一种智能化多功能冶金中间包及其浇铸方法

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JPS6044157A (ja) * 1983-08-17 1985-03-09 Sumitomo Metal Ind Ltd 電磁撹拌装置
JPH07100223B2 (ja) * 1987-01-30 1995-11-01 新日本製鐵株式会社 連続鋳造鋳型用電磁コイル装置
DE19542211B4 (de) * 1995-11-13 2005-09-01 Sms Demag Ag Elektromagnetische Rühreinrichtung für eine Brammenstranggießkokille
JP3965545B2 (ja) * 1999-06-28 2007-08-29 Ｊｆｅスチール株式会社 鋼の連続鋳造方法および装置
JP2004322179A (ja) * 2003-04-25 2004-11-18 Sumitomo Metal Ind Ltd 鋳型内電磁力制御装置および連続鋳造方法
JP4356531B2 (ja) 2004-06-11 2009-11-04 住友金属工業株式会社 鋼の連続鋳造方法及び鋳型内溶鋼の電磁力制御装置
JP4438705B2 (ja) * 2005-07-04 2010-03-24 住友金属工業株式会社 鋼の連続鋳造方法

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Also Published As

Publication number Publication date
EP2158985A4 (de) 2016-07-13
CN101678446A (zh) 2010-03-24
EP2158985A1 (de) 2010-03-03
JP4967856B2 (ja) 2012-07-04
KR20100005235A (ko) 2010-01-14
KR101154055B1 (ko) 2012-06-11
PL2158985T3 (pl) 2019-01-31
JP2009006370A (ja) 2009-01-15
BRPI0812965B1 (pt) 2021-07-27
WO2009001609A1 (ja) 2008-12-31
ES2694707T3 (es) 2018-12-26
BRPI0812965A2 (pt) 2020-06-23
CN101678446B (zh) 2011-12-07

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