EP0579702B1 - Procede de controle dynamique de la vitesse d'extraction lors d'un cycle de cicatrisation apres collage, dans un processus de coulee continue d'acier - Google Patents

Procede de controle dynamique de la vitesse d'extraction lors d'un cycle de cicatrisation apres collage, dans un processus de coulee continue d'acier Download PDF

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Publication number
EP0579702B1
EP0579702B1 EP92908866A EP92908866A EP0579702B1 EP 0579702 B1 EP0579702 B1 EP 0579702B1 EP 92908866 A EP92908866 A EP 92908866A EP 92908866 A EP92908866 A EP 92908866A EP 0579702 B1 EP0579702 B1 EP 0579702B1
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EP
European Patent Office
Prior art keywords
speed
steel
healing
ferritic
length
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Expired - Lifetime
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EP92908866A
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German (de)
English (en)
French (fr)
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EP0579702A1 (fr
Inventor
André Klein
Manfred Michael Wolf
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.)
Techmetal Promotion SA
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Techmetal Promotion SA
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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

Definitions

  • the invention relates to a method of dynamic control of the speed of extraction in a process of continuous casting of a steel of the type according to which, when detecting a bonding of skin in ingot molds, the speed of extraction of a cycle composed of a deceleration ramp from cruising speed to a reduced speed, a healing plateau and an acceleration ramp from reduced speed to cruising speed.
  • a process is known to Denanderesse.
  • the object of the invention is to replace the management of this cycle by a dynamic control adapted to the behavior of the steel and minimizing the slowdown period to the minimum time to heal the collage.
  • the invention achieves its object in that the ferritic potential of the cast steel is determined and in that at least the slope of the acceleration and deceleration ramps is determined as a function of this ferritic potential.
  • the invention is indeed based on the discovery based both on scientific considerations and on real experiences, according to which the ferritic potential, which will be defined later, can be considered as the determining factor in the speed regulation d during the healing cycle.
  • the reduced speed in the event of bonding is of the order of 0.2 to 1 m / minute to heal the bonding.
  • the graph in FIG. 1 represents, schematically, the extraction speed V (in m / min) as a function of time t (in min), around and during the healing cycle.
  • the extraction speed Before and after this cycle, the extraction speed has a cruising value V c .
  • PF 2.5 (0.5 -% Cp)
  • % Cp represents a carbon equivalent to the peritectic reaction, that is to say a C content corrected to take account of the influence of the other alloying elements.
  • % Cp % C + 0.02% Mn + 0.04% Ni-0.1% Si -0.04% Cr-0.1% Mo.
  • the value 1 of the ferritic potential signifies a completely ferritic solidification.
  • the negative values of the ferritic potential indicate a totally austenitic solidification.
  • the acceleration A expressed in m / min2 as a function of the ferritic potential, is an increasing function from a value slightly less than 0.1 m / min2 for very positive potentials up to a maximum of about 0.7 m / min2 for a potential close to 1, then decreasing from this maximum to a value slightly less than 0.2 m / min2 for negative potentials.
  • the durations t a (which theoretically result from the calculation (V vs -V r )/AT) are advantageously arranged to also take into account other alloying elements which promote bonding by affecting the viscosity of the slag in the mold.
  • the multiplication factors to remember (corresponding to similar division factors for A) are: Element,% content equal to or greater than 0.05 0.1 0.5 S 1 2 3 A1 1 2 3 Ti 1.5 3 6 Zr and / or REM 2 4 10
  • the preferred durations t d for deceleration are of the order of 0.5 to 30 s.
  • T L and T S are the liquidus and solidus temperatures .
  • the upper graph of FIG. 2 shows that the waiting time t r is an increasing function of the solidification interval, from values of approximately 15 s to values of approximately 6 min, the preferred durations being of the order of 30 to 300 s.
  • TABLE I Steel grade AT B VS D E F Analysis in% VS 0.05 0.02 0.005 1.0 0.12 0.35 Yes 0.5 3.0 0.20 Mn 1.5 0.30 0.50 Cr 18.0 1.5 Or 10.5 Ti 0.05 Al 0.03 Characteristic values : PF 0.53 1.95 1.24 -1.06 0.94 0.34 T L (° C) 1460 1506 1537 1465 1526 1502 T S (° C) 1408 1499 1535 1344 1504 1458 T L -T S (K) 52 7 2 121 22 44 Dynamic control criteria *): D ⁇ m / min2) -44 -12 -20 -68 -30 -52 t d (s) 1.4 5.0 3.0 0.9 2.0 1.2 t r (min) 0.7 0.3 0.3 3.6 0.3 0.5 A (
  • FIG. 3 shows the typical healing cycle of a bonding for the grade of mild steel X according to the invention and according to a conventional method X ′, as well as for a grade with a high silica content for sheets. electrical (steel B) and for a hard steel grade, type 100 C 6 (steel D).
  • electrical steel B
  • hard steel grade type 100 C 6
  • the cycle X 'requires a total t a + t r of 7 min, to which is added 0.9 s of deceleration. This results in a loss of productivity as well as a deterioration of the surface quality.
  • shade D requires a much longer cycle; the conventional method has insufficient security to effectively heal the bonding.
  • the reduced speed V r is advantageously between 0.2 and 1 m / min for most practical cases. Nevertheless, its determination preferably obeys the following criteria: the reduced speed of the healing cycle is substantially equal to the greater of the two values obtained by taking 70% of the cruising speed and a speed obtained relative to the useful length of the ingot mold at the length t r of the healing plate.
  • a speed V r substantially equal to 70% of V c is chosen if this is compatible with the possibility of scarring over the useful length L of the mold which extends between the second mold height and the outlet of the ingot mold.
  • an ingot mold with a total height of 0.90 meters, the second thermocouple height of which is 0.3 meters has a useful length of 0.6 m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Control Of Heat Treatment Processes (AREA)
EP92908866A 1991-04-10 1992-03-30 Procede de controle dynamique de la vitesse d'extraction lors d'un cycle de cicatrisation apres collage, dans un processus de coulee continue d'acier Expired - Lifetime EP0579702B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9104356 1991-04-10
FR9104356A FR2675062B1 (fr) 1991-04-10 1991-04-10 Procede de controle dynamique de la vitesse d'extraction lors d'un cycle de cicatrisation apres collage, dans un processus de coulee continue d'acier.
PCT/FR1992/000286 WO1992018273A1 (fr) 1991-04-10 1992-03-30 Procede de controle dynamique de la vitesse d'extraction lors d'un cycle de cicatrisation apres collage, dans un processus de coulee continue d'acier

Publications (2)

Publication Number Publication Date
EP0579702A1 EP0579702A1 (fr) 1994-01-26
EP0579702B1 true EP0579702B1 (fr) 1994-12-07

Family

ID=9411670

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EP92908866A Expired - Lifetime EP0579702B1 (fr) 1991-04-10 1992-03-30 Procede de controle dynamique de la vitesse d'extraction lors d'un cycle de cicatrisation apres collage, dans un processus de coulee continue d'acier

Country Status (17)

Country Link
US (1) US5449034A (zh)
EP (1) EP0579702B1 (zh)
KR (1) KR100230888B1 (zh)
CN (1) CN1046875C (zh)
AT (1) ATE115019T1 (zh)
AU (1) AU651883B2 (zh)
CA (1) CA2108127A1 (zh)
DE (1) DE69200848T2 (zh)
ES (1) ES2068032T3 (zh)
FI (1) FI97782C (zh)
FR (1) FR2675062B1 (zh)
IE (1) IE921133A1 (zh)
MX (1) MX9201617A (zh)
PT (1) PT100355A (zh)
TW (1) TW206171B (zh)
WO (1) WO1992018273A1 (zh)
ZA (1) ZA922532B (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6003840B2 (ja) * 2013-07-30 2016-10-05 トヨタ自動車株式会社 引上式連続鋳造方法
CN112191837B (zh) * 2020-10-12 2022-06-17 马鞍山钢铁股份有限公司 一种板坯连铸硅钢快换中包工艺控制方法
CN112362497B (zh) * 2020-10-27 2024-05-28 合肥工业大学 一种电磁感应加热沥青路面梯度自愈合率评级和控制方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111000A4 (en) * 1982-05-31 1984-09-19 Nippon Kokan Kk METHOD FOR FINDING DAMAGES ON THE CONTINUOUS CASTING DISH WHEN DRAWN FROM A HORIZONTAL CONTINUOUS CASTING MACHINE.
DE3307176A1 (de) * 1983-03-01 1984-09-06 Naučno-proizvodstvennoe ob"edinenie Tulačermet, Tula Steuerverfahren fuer das ausziehen eines giessstranges aus einer kokille bei horizontalem stranggiessen und einrichtung zur durchfuehrung des verfahrens
AU562731B2 (en) * 1985-02-01 1987-06-18 Nippon Steel Corporation Preventtion of casting defects in continuous casting
DE3528328A1 (de) * 1985-08-07 1987-02-19 Mannesmann Ag Verfahren und auszieheinrichtung zum horizontalstranggiessen von metall, insbesondere von stahl
US4762164A (en) * 1987-08-20 1988-08-09 Usx Corporation Mold friction monitoring for breakout protection
US5020585A (en) * 1989-03-20 1991-06-04 Inland Steel Company Break-out detection in continuous casting
JP2900594B2 (ja) * 1990-11-21 1999-06-02 日本鋼管株式会社 水平連続鋳造の引抜き制御方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LIGHT METALS, A PUBLICATION OF THE METALLURGICAL SOCIETY OF AIME 1985, pages 1285-1299; S.J. BERCOVICI: 'Optimisation of 3C roll caster by automatic control' see page 1293, lines 30-45 *

Also Published As

Publication number Publication date
TW206171B (zh) 1993-05-21
DE69200848D1 (de) 1995-01-19
AU1646492A (en) 1992-11-17
FI97782C (fi) 1997-02-25
PT100355A (pt) 1994-04-29
FR2675062A1 (fr) 1992-10-16
EP0579702A1 (fr) 1994-01-26
WO1992018273A1 (fr) 1992-10-29
US5449034A (en) 1995-09-12
AU651883B2 (en) 1994-08-04
FI934393A (fi) 1993-10-06
CN1046875C (zh) 1999-12-01
ZA922532B (en) 1992-12-30
IE921133A1 (en) 1992-10-21
CA2108127A1 (en) 1992-10-11
CN1065613A (zh) 1992-10-28
FI934393A0 (fi) 1993-10-06
MX9201617A (es) 1992-10-01
DE69200848T2 (de) 1995-05-04
FI97782B (fi) 1996-11-15
ATE115019T1 (de) 1994-12-15
FR2675062B1 (fr) 1993-07-16
ES2068032T3 (es) 1995-04-01
KR100230888B1 (ko) 1999-11-15

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