EP1066898A1 - Procédé et système d'alimentation de métal liquide d'une machine de coulée continue - Google Patents

Procédé et système d'alimentation de métal liquide d'une machine de coulée continue Download PDF

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Publication number
EP1066898A1
EP1066898A1 EP00114274A EP00114274A EP1066898A1 EP 1066898 A1 EP1066898 A1 EP 1066898A1 EP 00114274 A EP00114274 A EP 00114274A EP 00114274 A EP00114274 A EP 00114274A EP 1066898 A1 EP1066898 A1 EP 1066898A1
Authority
EP
European Patent Office
Prior art keywords
distributor
melt
temperature
casting
liq
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.)
Granted
Application number
EP00114274A
Other languages
German (de)
English (en)
Other versions
EP1066898B1 (fr
Inventor
Fritz-Peter Prof. Dr. Pleschiutschnigg
Stephan Dr. Feldhaus
Lothar Parschat
Michael Dr. Vonderbank
Erwin Dr. Wosch
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 Siemag AG
Original Assignee
SMS Demag 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
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1066898A1 publication Critical patent/EP1066898A1/fr
Application granted granted Critical
Publication of EP1066898B1 publication Critical patent/EP1066898B1/fr
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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • 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

Definitions

  • the invention relates to a method for guiding the melt in a continuous casting machine, the melt of a specific alloy having a liquidus temperature T liq being poured into a casting mold via a distributor and the strand which has solidified within the casting mold being drawn off, and a system therefor.
  • the invention relates to a continuous casting machine with a system according to the invention.
  • the object of the present invention is to provide a method and a system for To provide melt guidance in a continuous casting machine, with which one precise temperature and casting speed control for a reliable operation and in particular automated casting is possible.
  • the actual temperature of the melt in the distributor is recorded at an actual casting speed, the temperature being measured discontinuously or continuously by means of suitable known temperature recording means, for example thermocouples or temperature sensors.
  • suitable known temperature recording means for example thermocouples or temperature sensors.
  • the actual heat loss of the melt in the distributor and during its residence time between the distributor and the casting level in the casting mold, for example an oscillating mold, is determined by taking into account factors which are responsible for the heat loss. Knowing the liquidus temperature T liq of the melt to be cast and the current heat loss, an equivalent liquidus temperature T * liq (+ 0 ° C) is determined as the limit range for the temperature of the melt in the distributor, at which continuous casting defects occur in the mold.
  • the temperature of the melt in the distributor or the temperature curve is determined via the casting speed at which the melt solidifies in the casting mold at an undesirably early stage, ie in the casting level or in the area of the level. If the liquidus temperature is already reached in the mold level of the mold, there is a risk of bridging in the solidifying structure combined with a strand break through lack of slag lubrication or damaged strand surfaces.
  • the steel temperature in the mold must be chosen so that there is no pre-solidification in the mold level and the mold powder is melted sufficiently to ensure good lubrication and insulation of the strand as it travels through the mold.
  • the temperature of the melt in the distributor is used as a measure of the prediction the temperature conditions used in the mold.
  • the current temperature conditions in the mold can be predicted or indirectly within an "incubation period" and for adjustment an optimal casting speed or a casting speed range be used.
  • the casting speed is therefore not directly dependent from the temperature of the melt in the mold, but indirectly above the manifold temperature is set.
  • the method offers the possibility of an emerging, for example excessive cooling of the melt in the mold level of the mold, which is indicated by the determination of the equivalent T * liq temperature in the distributor, which is based on the melt temperature measurement in the distributor to react by a corresponding increase in the casting speed in order to avoid a casting defect in the mold in the form of surface defects on the cast product or a breakthrough.
  • T * liq temperature in the distributor which is based on the melt temperature measurement in the distributor to react by a corresponding increase in the casting speed in order to avoid a casting defect in the mold in the form of surface defects on the cast product or a breakthrough.
  • data is "online” to achieve good process management be measured, the solidification process in the mold at one of these optimal casting speed and at the same time a reinforcement-free production and ensure good surface quality.
  • the invention makes it clear that with the detection of the melt temperature in the distributor by discontinuous and / or continuous measurement and by the qualitative "online" detection of the heat losses of the melt in the distributor and between the distributor and the casting mold, an optimal, breakdown-proof and possibly fully automatic melt guidance alone on the data of the melt temperature in the distributor and the equivalent T * liq temperature of the melt in the distributor, T * liq. + 0 ° C and their isotherms +5 to + 20 ° C, preferably in a step interval of 5 ° C each, or the temperature profiles can be ensured via the casting speed to generate an isothermal window.
  • the casting speed is chosen so that the temperature of the melt in the distributor runs along or above the isotherms of the equivalent liquidus temperature curve T * liq + 5 ° C.
  • the temperature of the melt in the distributor should preferably run along or below the isotherms of the equivalent liquidus temperature profile T * liq + 20 ° C, particularly preferably below the isotherms of the equivalent liquidus temperature profile T * liq + 15 ° C.
  • the residence time of the melt goes into the heat loss of the melt in the distributor in the distributor, the residence time of the melt in the distributor being dependent the casting performance, which in turn is determined by the casting width, the solidification thickness, the casting speed, the current distributor level and the Ratio of distributor surface to its volume or the distributor size, the decrease in the melt weight in the distributor depending on it Surface / volume ratio, the initial heating time of the distributor for setting the equilibrium temperature corresponding to the melt temperature as well as the isolation or the isolation status of the distributor and thus the Heat radiation from the distributor.
  • the system proposed according to the invention is used in a continuous casting machine with an oscillating stand mold or traveling mold, also in Continuous casting machines with a casting mold that acts as a 2-roller mold (twin roller) or belt mold are formed. Allowed especially in the last two procedures the proposed system at the necessary high casting speeds with shorter solidification times with a smaller solidification thickness one optimal process control.
  • FIG. 1a schematically represents part of the casting process of a molten steel in a continuous casting machine
  • Figure 5 gives an overview of a complete continuous casting machine.
  • the melt is poured via a pan 1 into a distributor 2, from which it then flows into the mold 4 via a dip spout (also SEN) 3.
  • a stationary mold for example a thin slab mold, which oscillates vertically with respect to the solidifying strand shell 5a, b (see arrows in the mold side walls 6a, b).
  • the outflow speed of the melt from the distributor is regulated by means of a vertically movable plug 7 with a displacement device 7a or a slide 8.
  • the dip tube 3 dips into the mold 4.
  • 9 is the casting mold which is set, 10 is the casting powder or pouring slag.
  • the casting speed v c results.
  • X denotes the slab width resulting from the mold dimensions when it emerges from the mold.
  • the distributor 2 has a thermal radiation in the thermal equilibrium with the melt, here indicated by 11, which can be specified with a skin temperature of, for example, 100 ° C. and which thus leads to a loss of heat in the steel during its dwell time in the distributor.
  • the distributor 2 is further characterized by a maximum weight of the melt with a maximum filling height (h max ) in relation to the respective actual filling height h ist .
  • FIGS. 1a and 1b it is clear that the method according to the invention or system is not limited to continuous casting with an oscillating mold is, there are also casting processes using the strip casting process (Fig. 1a), in which the melt from a distributor 102 onto a cooled endless belt 104, which runs around two rollers 114, 115, is cast and drawn off, or for example 2-roll casting (Fig. 1b), in which the melt from one Distributor 202 is cast between two counter-rotating rollers 214, 215 and then subtracted, conceivable.
  • Fig. 1a strip casting process
  • Fig. 1b 2-roll casting
  • FIGS. 2 and 2a show the relationships between the melt temperature in the distributor or the Overheating of the melt in the distributor (or the heat loss of the melt in the distributor and between the distributor and bath level of the mold) and the casting speed and the utilization of these relationships for the mathematical prediction of the temperature of the melt in the bath level in the mold.
  • FIG. 2a shows a section from FIG. 2 in the casting speed range from 3.5 to 6.0 m / min. The temperature of the is below the manifold temperature Understand melt in the manifold.
  • T * liq temperature of the melt in the distributor 15
  • T * liq temperature curve T * liq + 0 ° C shown in the diagram show the temperature in the distributor at which the steel temperature in the Mold will reach the liquidus temperature. If the liquidus temperature (here about 1500 ° C) in the mold is reached too early, the solidification already takes place in the mold level and not only when it comes into contact with the mold walls to form the desired strand shell, which leads to bridging and thus a breakthrough due to the lack of it Slag lubrication or defective strand surfaces are connected.
  • the ratio of the temperature of the melt to the casting speed shown in FIGS. 2 and 2a can be influenced by various factors which shift the T / v c grid to higher or lower temperatures and thus introduce a dynamic.
  • the influence of various factors is shown in Figure 3.
  • the heat loss increases with the drop in the weight of the distributor as a function of the surface / volume ratio of the distributor and the residence time (influence B), as shown schematically in FIG. 3b.
  • the heat loss and thus the necessary overheating due to the so-called "liquid core reduction” also increase, the strand with still liquid sump being reduced from a mold exit thickness x to a smaller solidification thickness y (influence C).
  • the heat loss with greater casting performance is reduced by an initially increasing heating process of the distributor 2 when casting the first melt, the temperature adjusting to an equilibrium temperature after a certain time (cf. FIG. 2b).
  • the time t GG is approximately 20-30 minutes until a temperature equilibrium is established between the distributor and the melt (influence A).
  • the heat loss decreases with increasing pouring width, shown in Fig. 3a with the ratio D to D1) as well as with increasing solidification thickness (D2) and with improved insulation of the distributor of the distributor lining (influence E, Fig. 3a) or falling outer distributor skin temperature and the Dipping spout.
  • the T / v C grid becomes dynamic and can be constantly updated during casting with the help of process data recorded online.
  • a further course of the melt is also shown (20), in which the strand is poured too slowly or has insufficient overheating, and the temperature of the melt is already in the mold level of the mold T liq. was achieved.
  • the temperature of the melt in the distributor corresponds to the equivalent temperature T * liq or is less than T * liq , (21); the strand breaks through a pre-solidification in the mold level and thus the slag lubrication between the strand shell and the mold wall is disturbed and thus rejects.
  • FIG. 5 shows an overview of a continuous casting machine with a pan 300 and a holding device 301 receiving the pan 300 and a distributor 302 with corresponding holding device 303.
  • the heat loss of the melt in The distributor is determined by means of suitable measuring devices 304 and the data fed into a computer 307 via corresponding lines 305, 306. It is also conceivable to reduce the heat loss of the melt in the pan to be measured by means of measuring devices 308 and via line 309 into the computer feed. It is also conceivable in a first approximation of a constant Steel temperature in the pan with a temperature drop of, for example 0.1 ° C / min.
  • the liquidus temperature of the alloy is the equivalent liquidus temperature calculated and in the temperature / casting speed diagram represented by a monitor 310.
  • a target casting speed which is in the isothermal window shown, set, and via a line 312 the slide or plug of the distributor as setting means (315) controlled for the casting speed.
  • the method and the system are preferably used for thin slab casting.
  • a thin slab of, for example, 50 mm solidification thickness requires a setting time of about 1 min.
  • the events in the Mold at casting speeds of up to 8 m / min so far and in the near future 10 m / min make a precise temperature and Speed control necessary, which is provided according to the invention becomes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
EP00114274A 1999-07-06 2000-07-04 Procédé d'alimentation de métal liquide d'une machine de coulée continue Expired - Lifetime EP1066898B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19930909 1999-07-06
DE19930909 1999-07-06

Publications (2)

Publication Number Publication Date
EP1066898A1 true EP1066898A1 (fr) 2001-01-10
EP1066898B1 EP1066898B1 (fr) 2005-03-09

Family

ID=7913672

Family Applications (1)

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EP00114274A Expired - Lifetime EP1066898B1 (fr) 1999-07-06 2000-07-04 Procédé d'alimentation de métal liquide d'une machine de coulée continue

Country Status (9)

Country Link
US (1) US6539273B1 (fr)
EP (1) EP1066898B1 (fr)
JP (1) JP2001038456A (fr)
KR (1) KR100720429B1 (fr)
CN (1) CN1258415C (fr)
AT (1) ATE290446T1 (fr)
DE (1) DE50009703D1 (fr)
ES (1) ES2238224T3 (fr)
TW (1) TW452515B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864844A1 (fr) * 2004-01-07 2005-07-08 Saint Gobain Dispositif d'eclairage autonettoyant
CN104226951A (zh) * 2014-09-05 2014-12-24 河北钢铁股份有限公司邯郸分公司 一种连铸机停浇阶段提高合格定尺铸坯产量的方法
CN103464699B (zh) * 2013-08-13 2016-01-20 新疆八一钢铁股份有限公司 一种提高连铸机中间包热交换成功率的方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10027324C2 (de) * 1999-06-07 2003-04-10 Sms Demag Ag Verfahren zum Gießen eines metallischen Strangs sowie System hierzu
AT413950B (de) * 2004-05-26 2006-07-15 Voest Alpine Ind Anlagen Stranggiessanlage mit mindestens einem roboter und verfahren zum betrieb einer stranggiessanlage unter einbindung von mindestens einem roboter
KR101485663B1 (ko) 2013-04-16 2015-01-22 주식회사 포스코 연속주조 주편의 폭 제어방법
CN106141132A (zh) * 2015-03-31 2016-11-23 新日铁住金工程技术株式会社 铸坯的制造方法及连续铸造装置
CN105127390B (zh) * 2015-09-02 2017-08-29 中冶连铸技术工程有限责任公司 连铸用电磁搅拌控制方法及***
CN107598146B (zh) * 2017-08-17 2019-04-30 中冶连铸技术工程有限责任公司 用浸入式水口流钢通道截面积预控塞棒头位置的方法
EP3533536B1 (fr) 2018-02-28 2023-05-24 Heraeus Electro-Nite International N.V. Procédé et appareil de surveillance d'un processus de coulée continue d'acier
CN110057864B (zh) * 2019-05-08 2020-02-07 北京科技大学 一种钢液在水口通道内加热过程的模拟装置和方法
CN111199119B (zh) * 2019-12-18 2022-06-17 中冶南方连铸技术工程有限责任公司 连铸异形坯坯头温度模拟方法

Citations (3)

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US4235276A (en) * 1979-04-16 1980-11-25 Bethlehem Steel Corporation Method and apparatus for controlling caster heat removal by varying casting speed
CH646352A5 (en) * 1980-01-11 1984-11-30 Vnii Avtom Chernoi Metallurg Apparatus for regulating the secondary cooling in a continuous-casting installation with batchwise smelt supply via a tundish
JPH07112260A (ja) * 1993-10-14 1995-05-02 Nippon Steel Corp 連続鋳造装置のピンチローラ速度制御装置

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SE415535B (sv) * 1978-06-13 1980-10-13 Asea Ab Anordning vid kontinuerlig gjutning, sasom strenggjutning
JP2543909B2 (ja) * 1987-09-24 1996-10-16 新日本製鐵株式会社 鋼帯の連続鋳造方法
JPH07132349A (ja) * 1993-11-10 1995-05-23 Nippon Steel Corp 双ロール式連続鋳造方法
FR2734186B1 (fr) * 1995-05-17 1997-06-13 Unimetall Sa Procede de lubrification des parois d'une lingotiere de coulee continue des metaux et lingotiere pour sa mise en oeuvre
JP3188148B2 (ja) * 1995-07-25 2001-07-16 三菱重工業株式会社 連続鋳造機
DE19529046A1 (de) * 1995-07-31 1997-02-06 Mannesmann Ag Verfahren und Einrichtung zum Betreiben einer Stranggießanlage
DE19725433C1 (de) * 1997-06-16 1999-01-21 Schloemann Siemag Ag Verfahren und Vorrichtung zur Durchbruchfrüherkennung beim Stranggießen von Stahl mit einer oszillierenden Kokille
DE10027324C2 (de) * 1999-06-07 2003-04-10 Sms Demag Ag Verfahren zum Gießen eines metallischen Strangs sowie System hierzu
UA74557C2 (en) * 1999-09-03 2006-01-16 Applied Research Systems A method for producing a heterologous secreted protein from chinese hamster ovaries cells grown on microcarriers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235276A (en) * 1979-04-16 1980-11-25 Bethlehem Steel Corporation Method and apparatus for controlling caster heat removal by varying casting speed
CH646352A5 (en) * 1980-01-11 1984-11-30 Vnii Avtom Chernoi Metallurg Apparatus for regulating the secondary cooling in a continuous-casting installation with batchwise smelt supply via a tundish
JPH07112260A (ja) * 1993-10-14 1995-05-02 Nippon Steel Corp 連続鋳造装置のピンチローラ速度制御装置

Non-Patent Citations (1)

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Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864844A1 (fr) * 2004-01-07 2005-07-08 Saint Gobain Dispositif d'eclairage autonettoyant
CN103464699B (zh) * 2013-08-13 2016-01-20 新疆八一钢铁股份有限公司 一种提高连铸机中间包热交换成功率的方法
CN104226951A (zh) * 2014-09-05 2014-12-24 河北钢铁股份有限公司邯郸分公司 一种连铸机停浇阶段提高合格定尺铸坯产量的方法

Also Published As

Publication number Publication date
KR20010015196A (ko) 2001-02-26
ES2238224T3 (es) 2005-09-01
CN1258415C (zh) 2006-06-07
JP2001038456A (ja) 2001-02-13
ATE290446T1 (de) 2005-03-15
KR100720429B1 (ko) 2007-05-21
EP1066898B1 (fr) 2005-03-09
US6539273B1 (en) 2003-03-25
CN1280041A (zh) 2001-01-17
DE50009703D1 (de) 2005-04-14
TW452515B (en) 2001-09-01

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