EP0036342B1 - Procédé de contrôle du refroidissement du produit coulé dans une installation de coulée continue - Google Patents

Procédé de contrôle du refroidissement du produit coulé dans une installation de coulée continue Download PDF

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Publication number
EP0036342B1
EP0036342B1 EP81400212A EP81400212A EP0036342B1 EP 0036342 B1 EP0036342 B1 EP 0036342B1 EP 81400212 A EP81400212 A EP 81400212A EP 81400212 A EP81400212 A EP 81400212A EP 0036342 B1 EP0036342 B1 EP 0036342B1
Authority
EP
European Patent Office
Prior art keywords
curve
ingot
water flow
fact
cooling zone
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.)
Expired
Application number
EP81400212A
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German (de)
English (en)
French (fr)
Other versions
EP0036342A1 (fr
Inventor
Alain Chielens
Philippe Benoit
Bernard Roggo
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.)
Fives Cail Babcock SA
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Fives Cail Babcock SA
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Publication date
Application filed by Fives Cail Babcock SA filed Critical Fives Cail Babcock SA
Publication of EP0036342A1 publication Critical patent/EP0036342A1/fr
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Publication of EP0036342B1 publication Critical patent/EP0036342B1/fr
Expired legal-status Critical Current

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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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling

Definitions

  • the molten metal begins to solidify in the ingot mold, where a relatively thin skin is formed, then solidification continues in the secondary cooling zone equipped with nozzles or spraying booms or water atomization.
  • this secondary cooling by nozzles or ramps is to ensure regular growth of the skin formed in the mold to achieve complete solidification of the product cast in the form of a bar after a predetermined time. Sufficient water flows must be projected onto the bar to maintain the temperature of the skin of the cast product at a value low enough for it to have adequate mechanical strength. On the other hand, if too large water flow rates are used, the temperature of the product poured into the straightening zone of the bar from the curved state to the straight state will be too low; there will follow a decrease in the ductility of the surface of the cast metal such that the deformations due to the straightening of the bar will be greater than the limit deformations acceptable by the metal in this zone. In general, uncontrolled cooling of the cast product can be the cause of significant metallurgical defects, in particular of internal and surface cracks.
  • the product poured is divided into a fictitious elementary slices in a secondary cooling zone and the flow rate reference values are determined periodically by means of a computer. of water from the different sections of the secondary cooling zone according to the age of the units located in said sections. For this one uses one or more variation curves of the water flow rates as a function of the age of the product which are pre-established from the results of tests and calculations, control data such as the surface temperature of the cast product being transmitted to the computer.
  • the measurement of the surface temperature of the cast product is very difficult if not impossible in the upper part of the secondary cooling zone because of the small spacing of the guide rollers and the presence of the spray nozzles or booms. Furthermore, the temperature measurements in most of the secondary cooling zone are distorted by the presence of water vapor and mist in the vicinity of the surfaces of the cast product and of the layer of scale covering these surfaces. This is why in practice it is sufficient to measure the surface temperature of the product poured into the last part of the cooling zone or at the outlet thereof.
  • the present invention provides a method and a system for taking into account the actual behavior and the thermal history of the cast product.
  • the equations from which the curves of the quantity of heat extracted and the surface temperature are established include parameters whose value can vary from one casting to another: nature of the metal cast, format of the product cast. It is therefore necessary to have a set of curves for each steel grade and each format that is planned to be cast.
  • this curve is corrected by connecting by a straight line or a 2nd or 3rd degree curve the point whose the coordinates are, on the one hand, the residence time in the ingot mold and, on the other hand, the surface temperature of the product at the outlet of the ingot mold at a point on the curve corresponding to an upper section of the cooling zone, and the set values of the water flow rates are calculated from the corrected curve.
  • the surface temperature of the product poured at the outlet of the ingot mold is measured by means of an optical pyrometer or calculated from the amount of heat extracted in the ingot mold by means of a curve established using forecast simulation calculations.
  • the machine for the continuous casting of steel shown diagrammatically in FIG. 1 essentially comprises an ingot mold 10, a corset of guide rollers 12, straightening rollers 14 and a cooling device comprising nozzles or spray or atomization grouped by sections, all the nozzles or booms of the same section being connected in parallel on a supply pipe fitted with a valve 16 whose opening is controlled by a regulator 18 to maintain the supply flow equal at a set flow rate set by a computer 20.
  • the nozzles or booms are distributed all around the casting bar or, in the case of a bar with rectangular section, only on its large faces. Means are provided for manually adjusting the distribution between the different nozzles or booms of a section, according to their position, of the total flow of water supplying this section.
  • thermometric rod 22 for measuring the temperature of the molten metal in the distributor 24
  • thermometric probes 26 for measuring the temperature of the water of cooling already in the mold, at its inlet and outlet
  • flow meter 28 for measuring the flow rate of the cooling water of the mold
  • pulse generator 30 for measuring the extraction speed of the bar and calculating the age of the elements of the bar
  • pyrometer 32 for measuring the surface temperature. from the bar near the righting point, etc ...
  • the latter determines at regular intervals the set values of the water supply flow rates of the different sections of the cooling device.
  • This regular time interval is for example between 1 and 50 seconds.
  • the principle of cooling control according to the invention is to maintain over time the evolution of the solidification of the bar regardless of the operating regime of the casting machine.
  • a law of variation of the quantity of heat C extracted per kilo of steel as a function of the residence time in the machine ( Figure 3) with which is associated a law of variation of the surface temperature T of the bar as a function of the residence time in the machine ( Figure 2).
  • These laws essentially depend on the grade of steel, the size of the bar and the speed of extraction.
  • steel grades and extraction speeds will be grouped into different classes. For steel grades, the number of classes will depend on the order book of the steelworks. The extraction speeds can for example be grouped into three classes: high, medium and low.
  • the heat flux density extracted by the lateral surface S of the periphery of the wafer will be: and the heat exchange coefficient on the periphery of the wafer will be: being the average surface temperature of the wafer.
  • This method is slightly modified when the faces of the bar are not cooled by spraying water over their entire width. We then consider only the middle parts of the faces of the wafer, that is to say that S represents only the total surface of these middle parts and T is the average surface temperature on this surface.
  • the set values of the supply water flow rates of the different sections of the cooling zone are calculated by integration. Cool and the calculated values are transmitted to the respective controllers 18.
  • the total water flow rate of the cooling zone is calculated and deduced therefrom the total air flow to be used, using an equation or a curve establishing a relationship between these two flows.
  • Means are provided for manually adjusting the distribution between the different sections of the total air flow supplying the secondary cooling zone.
  • the computer 20 determines, from the values of the flow rate and of the temperatures at the inlet and at the outlet of the cooling water of the ingot mold, measured continuously by the probes 26 and the flow meter 28, or from a file of values established using forecast simulation calculations, the quantity of heat extracted in the mold and deduces the time lag which must be taken into account for the determination of the quantities of heat to be extracted in the secondary cooling zone.
  • the measurement of the surface temperature of the bar in the vicinity of the straightening point is continuously transmitted to the computer 20 by the pyrometer 32. If its value deviates too much from the desired value (for example if the difference is greater than 50 ° C), the computer modifies the setpoint values calculated for the last section (s) of the secondary cooling zone accordingly.
  • the computer first corrects the setpoint for the water flow rate of the last cooling section; the extent of the correction depends on the difference between the measured temperature and the desired temperature. Then after a certain time, which depends on the position of the last cooling section relative to the rectification point, the computer corrects the set values for the water flow rates of the last two cooling sections if the difference between the temperatures is still too important.
  • the computer maintains or not, depending on the temperature difference, the correction of the setpoints of the water flow rates of the two last sections.
  • this could gradually correct the water flow setpoints for the last three or four sections of the cooling zone.
  • the set values of the feed water flow rates of each section of the cooling zone are calculated by integrating the water flow rates calculated for each elementary unit located in the section considered. As this average speed varies gradually to finally become equal to the new speed, if it is stable, the set values of the water flows for each section of the cooling zone will gradually change from the values they had at the initial speed up to the values corresponding to the new speed.
  • the computer can supply other information: proposal of an optimal extraction speed in steady state which depends on the nature of the metal, the format of the product and the temperature of the metal in the distributor, alarms if the temperature of the steel in the distributor exceeds the limits imposed, if the calculated water flows are greater than predetermined maximum values, if the difference between the measured and calculated water flows is greater than 10%, if the actual extraction speed is greater than the optimal speed, if the surface temperature at the righting point is too low, etc.
  • the computer can also be advantageously used to control the state of the secondary cooling device between two flows. For this, we will supply the different sections of the cooling device; after setting flow rate setpoints using the calculator, the actual flow rates and actual pressures will be measured and the measured values will be compared with the calculated values. If the device is in good condition (no wear, no fouling, no leakage), there should be no significant differences between these values; in particular for a given flow rate, the pressure measured must comply with the pressure calculated.
  • the calculated pressures are determined by the computer using the pressure-flow curves which are stored in the computer memory and which are pre-established on the basis of test and calculation results.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP81400212A 1980-03-13 1981-02-11 Procédé de contrôle du refroidissement du produit coulé dans une installation de coulée continue Expired EP0036342B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8005592A FR2477925A1 (fr) 1980-03-13 1980-03-13 Procede de controle du refroidissement du produit coule dans une installation de coulee continue
FR8005592 1980-03-13

Publications (2)

Publication Number Publication Date
EP0036342A1 EP0036342A1 (fr) 1981-09-23
EP0036342B1 true EP0036342B1 (fr) 1984-02-15

Family

ID=9239620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400212A Expired EP0036342B1 (fr) 1980-03-13 1981-02-11 Procédé de contrôle du refroidissement du produit coulé dans une installation de coulée continue

Country Status (6)

Country Link
US (1) US4463795A (enrdf_load_stackoverflow)
EP (1) EP0036342B1 (enrdf_load_stackoverflow)
JP (1) JPS56151156A (enrdf_load_stackoverflow)
AT (1) ATE6216T1 (enrdf_load_stackoverflow)
DE (1) DE3162190D1 (enrdf_load_stackoverflow)
FR (1) FR2477925A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102632213A (zh) * 2011-02-12 2012-08-15 沈阳鑫君城电子有限公司 铸坯表面温度测量和控制方法及其专用装置

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513912A2 (fr) * 1981-10-02 1983-04-08 Fives Cail Babcock Procede de controle du refroidissement du produit coule dans une installation de coulee continue
AT378707B (de) * 1983-01-11 1985-09-25 Voest Alpine Ag Verfahren zum ueberwachen einer bogenstranggiessanlage
FR2540016B1 (fr) * 1983-01-28 1985-06-07 Siderurgie Fse Inst Rech Procede de reglage du refroidissement secondaire d'une machine de coulee continue
JPS6174763A (ja) * 1984-09-17 1986-04-17 Sumitomo Heavy Ind Ltd 連続鋳造機における鋳片の表面温度制御方法
JPS6171162A (ja) * 1984-09-17 1986-04-12 Sumitomo Heavy Ind Ltd 連続鋳造機における鋳片の表面温度制御方法
JPS6171161A (ja) * 1984-09-17 1986-04-12 Sumitomo Heavy Ind Ltd 連続鋳造機における鋳片の表面温度制御方法
US5987058A (en) * 1988-11-02 1999-11-16 Axonn Corporation Wireless alarm system
FR2643580B1 (fr) * 1989-02-27 1991-05-10 Siderurgie Fse Inst Rech Procede de reglage du refroidissement secondaire d'une machine de coulee continue de produits metalliques
US5553094A (en) 1990-02-15 1996-09-03 Iris Systems, Inc. Radio communication network for remote data generating stations
DE4210495C1 (enrdf_load_stackoverflow) * 1992-03-31 1993-04-15 Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De
AT403351B (de) * 1993-05-19 1998-01-26 Voest Alpine Ind Anlagen Verfahren zum stranggiessen eines metallstranges
ES2181698T3 (es) * 1993-10-29 2003-03-01 Danieli Off Mecc Metodo para el tratamiento termico de superficie en una maquina de colada continua y dispositivo correspondiente.
US6264767B1 (en) 1995-06-07 2001-07-24 Ipsco Enterprises Inc. Method of producing martensite-or bainite-rich steel using steckel mill and controlled cooling
DE19612420C2 (de) * 1996-03-28 2000-06-29 Siemens Ag Verfahren und Einrichtung zur Steuerung der Kühlung eines Stranges in einer Stranggießanlage
US6056041A (en) * 1997-06-12 2000-05-02 Alcan International Limited Method and apparatus for controlling the temperature of an ingot during casting, particularly at start up
CA2277392C (en) 1998-07-10 2004-05-18 Ipsco Inc. Differential quench method and apparatus
US6796362B2 (en) * 2000-06-01 2004-09-28 Brunswick Corporation Apparatus for producing a metallic slurry material for use in semi-solid forming of shaped parts
US6399017B1 (en) * 2000-06-01 2002-06-04 Aemp Corporation Method and apparatus for containing and ejecting a thixotropic metal slurry
US6432160B1 (en) 2000-06-01 2002-08-13 Aemp Corporation Method and apparatus for making a thixotropic metal slurry
US7024342B1 (en) 2000-07-01 2006-04-04 Mercury Marine Thermal flow simulation for casting/molding processes
US20090084517A1 (en) * 2007-05-07 2009-04-02 Thomas Brian G Cooling control system for continuous casting of metal
DE102007058109A1 (de) * 2007-12-03 2009-06-04 Sms Demag Ag Vorrichtung zur Steuerung oder Regelung einer Temperatur
DE102008004911B4 (de) * 2008-01-18 2025-02-13 Sms Group Gmbh Verfahren zur Regelung der Sekundärkühlung von Stranggießanlagen
CN108031806A (zh) * 2017-10-17 2018-05-15 襄阳远锐资源工程技术有限公司 一种铅锭浇铸装置及浇铸方法
CN113924823A (zh) * 2019-05-28 2022-01-11 堺显示器制品株式会社 有机el器件的制造方法
CN110570760B (zh) 2019-08-13 2022-01-04 武汉华星光电半导体显示技术有限公司 一种可折叠柔性显示装置
CN113102714B (zh) * 2020-07-30 2021-12-03 北京科技大学 一种控制包晶钢板坯角部裂纹的连铸冷却方法
CN112958751A (zh) * 2021-01-27 2021-06-15 唐山不锈钢有限责任公司 一种连铸二次冷却状态的在线预测和管理方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2070724A1 (en) * 1969-12-03 1971-09-17 Schloemann Ag Cooling bar issuing from an open ended in- - got mould
FR2197676A1 (enrdf_load_stackoverflow) * 1972-09-06 1974-03-29 Concast Ag
FR2285947A1 (fr) * 1974-09-26 1976-04-23 Centre Rech Metallurgique Procede pour controler la coulee continue des metaux
FR2370540A1 (fr) * 1976-11-12 1978-06-09 Wilhelm Werner Procede et dispositif de refroidissement secondaire d'une billette de metal

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US3478808A (en) * 1964-10-08 1969-11-18 Bunker Ramo Method of continuously casting steel
BE743450A (enrdf_load_stackoverflow) * 1968-12-31 1970-06-19
DE2444794A1 (de) * 1974-09-19 1976-04-01 Demag Ag Verfahren zum kuehlen des in einer stahlstranggiessanlage erzeugten stranges
US4073332A (en) * 1974-09-26 1978-02-14 Centre De Recherches Metallurgiques Centrum Voor Research In De Metallurgie Method of controlling continuous casting of a metal
JPS5246330A (en) * 1975-10-11 1977-04-13 Nippon Steel Corp Method of controlling volume of coolin water of secondary cooling zone in continuous casting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2070724A1 (en) * 1969-12-03 1971-09-17 Schloemann Ag Cooling bar issuing from an open ended in- - got mould
FR2197676A1 (enrdf_load_stackoverflow) * 1972-09-06 1974-03-29 Concast Ag
FR2285947A1 (fr) * 1974-09-26 1976-04-23 Centre Rech Metallurgique Procede pour controler la coulee continue des metaux
FR2370540A1 (fr) * 1976-11-12 1978-06-09 Wilhelm Werner Procede et dispositif de refroidissement secondaire d'une billette de metal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102632213A (zh) * 2011-02-12 2012-08-15 沈阳鑫君城电子有限公司 铸坯表面温度测量和控制方法及其专用装置

Also Published As

Publication number Publication date
JPS6345905B2 (enrdf_load_stackoverflow) 1988-09-12
US4463795A (en) 1984-08-07
JPS56151156A (en) 1981-11-24
FR2477925A1 (fr) 1981-09-18
ATE6216T1 (de) 1984-03-15
FR2477925B1 (enrdf_load_stackoverflow) 1983-12-16
EP0036342A1 (fr) 1981-09-23
DE3162190D1 (en) 1984-03-22

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