EP0080433B1 - Method of cooling a cast strand during continuous casting - Google Patents
Method of cooling a cast strand during continuous casting Download PDFInfo
- Publication number
- EP0080433B1 EP0080433B1 EP82810487A EP82810487A EP0080433B1 EP 0080433 B1 EP0080433 B1 EP 0080433B1 EP 82810487 A EP82810487 A EP 82810487A EP 82810487 A EP82810487 A EP 82810487A EP 0080433 B1 EP0080433 B1 EP 0080433B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coolant
- ingot
- strand
- cooling
- polyacrylamides
- 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
Links
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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
Definitions
- the invention relates to a method for cooling a casting strand emerging from a continuous casting mold during the continuous casting by applying water directly to the surface of the strand, the water being admixed with an additive which reduces the cooling effect, at least during the start-up process.
- the inventor has set itself the goal of creating a method of the type mentioned at the outset with which the cooling intensity can be reduced in a simple manner and without the disadvantages mentioned above.
- the solution to this problem is that partially hydrolyzed anionic polyacrylamides with a molecular weight of 106 to 5 ⁇ 10 7 are added to the cooling water at least during the start-up process.
- the polyacrylamides can be fed in a previously prepared concentrated form - for example as an aqueous solution with 10 to 50 g polyacrylamides / liter solution - from a storage container via a metering pump into a coolant supply line.
- the polyacrylamides preferably have a degree of hydrolysis of 10 to 20% and a molecular weight of approximately 1.5 ⁇ 10 7 .
- the method according to the invention can be implemented both with conventional and with electromagnetic continuous casting molds and is particularly suitable for casting light metals, in particular aluminum and aluminum alloys.
- the proportion of the additive in the coolant depends on the desired reduction in the cooling intensity and is usually in the order of 1 to 100 mg / liter of water.
- the supply of the polyacrylamides to the coolant can be interrupted.
- the concentration of the polyacrylamides in the coolant is continuously reduced during the start-up process. In certain cases, however, it may prove expedient to maintain the method according to the invention during the entire casting process.
- an alloy 3004 was cast under normal conditions into bars of the format 500 mm x 1600 mm.
- the cooling water supply was kept constant at 600 liters / minute during the entire casting process.
- Anionic, 15% hydrolyzed polyacrylamides with a molecular weight of 1.5 ⁇ 10 7 were added to the cooling water up to a strand length of 100 mm.
- an aqueous solution containing 10 to 50 g of polyacrylamides per liter of solution was fed directly into the main cooling water pipe from a storage tank.
- the concentration of polyacrylamides in the coolant was 5 - 25 mg per liter of water.
- the supply of the polyacrylamides was interrupted after the start-up during the further casting process.
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Kühlen eines aus einer Stranggießkokille während des Stranggießens austretenden Gießstranges durch Aufbringen von Wasser unmittelbar auf die Strangoberfläche, wobei dem Wasser zumindest während des Anfahrvorganges ein die Kühlwirkung herabsetzender Zusatz beigemischt wird.The invention relates to a method for cooling a casting strand emerging from a continuous casting mold during the continuous casting by applying water directly to the surface of the strand, the water being admixed with an additive which reduces the cooling effect, at least during the start-up process.
Beim Stranggießen mit direkter Kühlung wird dem aus der Kokille austretenden Gießstrang durch Beaufschlagen der Strangoberfläche mit Kühlmittel unmittelbar unterhalb der Kokille Wärme entzogen. Während des Anfahrvorganges berührt das Kühlmittel zunächst nur den Anfahrboden. Der hierbei eintretende indirekte Wärmeentzug führt zu einer milden Erstarrung des flüßigen Metalls und zu einer ebenen Ausbildung des Strangfußes. Mit fortschreitendem Absenken des Anfahrbodens trifft das Kühlmittel direkt auf die Oberfläche des Stranges auf, was mit einer sprunghaften Erhöhung der Wärmeabfuhr aus dem Gießstrang verbunden ist. Die als Folge dieses Temperaturschocks auftretenden Wärmespannungen sind größer als die Dehnungsfestigkeit des Gießstranges und führen zu einer bleibenden Verformung in Form einer konvexen Wölbung des Strangfußes und bei . Überschreiten der Zerreissfestigkeit überdies zu Rissen im Strang. Um einen Gießstrang mit ebenem Fuß zu erhalten, darf der Strang demzufolge während des Anfahrvorganges nicht zu stark gekühlt werden.In continuous casting with direct cooling, heat is removed from the casting strand emerging from the mold by applying coolant to the surface of the strand directly below the mold. During the start-up process, the coolant initially only touches the start-up floor. The indirect heat removal that occurs here leads to a mild solidification of the liquid metal and to a flat formation of the strand foot. With the progressive lowering of the start-up floor, the coolant hits the surface of the strand, which is associated with a sudden increase in heat dissipation from the casting strand. The thermal stresses that occur as a result of this temperature shock are greater than the tensile strength of the cast strand and lead to permanent deformation in the form of a convex curvature of the strand base and. Exceeding the tensile strength also leads to cracks in the strand. In order to obtain a cast strand with a flat foot, the strand must not be cooled too much during the start-up process.
Aus der DE-A-29 09 990 ist ein Verfahren bekannt, bei dem das Kühlmittel zumindest während des Anfahrvorganges ein unter Druck eingebrachtes Gas enthält. Das gelöste Gas bildet beim Auftreffen des Kühlmittels auf der Strangoberfläche einen den Wärmeabfluß vermindernden Isolierfilm, welcher eine Herabsetzung der Kühlintensität zur Folge hat. Die Notwendigkeit, das Kühlmittel unter Druck zu halten erschwert jedoch die Anwendung dieses Verfahrens.From DE-A-29 09 990 a method is known in which the coolant contains a gas introduced under pressure at least during the starting process. When the coolant strikes the surface of the strand, the dissolved gas forms an insulating film which reduces the heat flow, which results in a reduction in the cooling intensity. However, the need to keep the coolant under pressure complicates the use of this method.
Aus dem Abstract Nr. 153 963 im Band 93 der "Chemical Abstracts" ist bekannt, zur Beeinflussung der Abschreckwirkung beim Stahl-Härten dem Wasser Polyäthylenoxid beizumischen.From abstract No. 153 963 in volume 93 of the "Chemical Abstracts" it is known to add polyethylene oxide to the water in order to influence the quenching effect during steel hardening.
Angesichts dieser Gegebenheiten hat sich der Erfinder das Ziel gesetzt, ein Verfahren der eingangs erwähnten Art zu schaffen, mit welchem die Kühlintensität auf einfache Weise und ohne die vorstehnd genannten Nachteile vermindert werden kann.In view of these circumstances, the inventor has set itself the goal of creating a method of the type mentioned at the outset with which the cooling intensity can be reduced in a simple manner and without the disadvantages mentioned above.
Zur Lösung dieser Aufgabe führt, daß dem Kühlwasser zumindest während des Anfahrvorganges partiell hydrolysierte anionische Polyacrylamide mit einem Molekulargewicht von 106 bis 5 x 107 beigemischt werden.The solution to this problem is that partially hydrolyzed anionic polyacrylamides with a molecular weight of 106 to 5 × 10 7 are added to the cooling water at least during the start-up process.
Durch diesen Zusatz zum Kühlwasser wird die Kinetik der Bildung und Ablösung von
- Dampfblasen beim Auftreffen des Kühlmittels auf der heißen Strangoberfläche als Folge der starken Verminderung der Oberflächenspannung des Kühlmittels derart drastisch verändert, daß sich auf der Strangoberfläche ein den Wärmeabfluß hemmender lsolierfilm aus Wasserdampf aufbaut.
- Vapor bubbles when the coolant strikes the hot strand surface as a result of the strong reduction in the surface tension of the coolant changes so drastically that an insulating heat film which inhibits the outflow of heat builds up on the strand surface.
Die Polyacrylamide können in vorgängig präparierter konzentrierter Form - beispielsweise als wässrige Lösung mit 10 bis 50 g Polyacrylamiden/Liter Lösung - von einem Vorratsbehälter über eine Dosierpumpe in eine Kühlmittelzufuhrleitung eingespiesen werden.The polyacrylamides can be fed in a previously prepared concentrated form - for example as an aqueous solution with 10 to 50 g polyacrylamides / liter solution - from a storage container via a metering pump into a coolant supply line.
Die Polyacrylamide weisen bevorzugt einen Hydrolysierungsgrad von 10 bis 20 % und ein Molekulargewicht von etwa 1,5 x 107 auf.The polyacrylamides preferably have a degree of hydrolysis of 10 to 20% and a molecular weight of approximately 1.5 × 10 7 .
Das erfindungsgemässe Verfahren läßt sich sowohl mit konventionellen als auch mit elektromagnetischen Stranggießkokillen realisieren und ist besonders geeignet zum Gießen von Leichtmetallen, insbesondere von Aluminium und Aluminiumlegierungen. Der Anteil des Zusatzes im Kühlmittel richtet sich nach der jeweils gewünschten Verminderung der Kühlintensität und liegt üblicherweise in der Größenordnung von 1 bis 100 mg/Liter Wasser.The method according to the invention can be implemented both with conventional and with electromagnetic continuous casting molds and is particularly suitable for casting light metals, in particular aluminum and aluminum alloys. The proportion of the additive in the coolant depends on the desired reduction in the cooling intensity and is usually in the order of 1 to 100 mg / liter of water.
Nach beendetem Anfahrvorgang kann die Zufuhr der Polyacrylamide zum Kühlmittel unterbrochen werden. Bei einer anderen Durchführungsart des Verfahrens wird die Konzentration der Polyacrylamide im Kühlmittel während des Anfahrvorganges kontinuierlich vermindert. In gewissen Fällen kann es sich jedoch als zweckmässig erweisen, das erfindungsgemässe Verfahren während des gesamten Gießvorganges beizubehalten.After the start-up process, the supply of the polyacrylamides to the coolant can be interrupted. In another way of carrying out the method, the concentration of the polyacrylamides in the coolant is continuously reduced during the start-up process. In certain cases, however, it may prove expedient to maintain the method according to the invention during the entire casting process.
Weitere Vorteile, Merkmale und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele.Further advantages, features and details emerge from the following description of preferred exemplary embodiments.
Auf einer Vertikalstranggießanlage mit elektromagnetischer Kokille wurde eine Legierung 3004 unter praxisüblichen Bedingungen zu Barren vom Format 500 mm x 1600 mm vergoßen. Die Kühlwasserzufuhr wurde während des gesamten Gießvorganges auf 600 Liter/Minute konstant gehalten. Bis zu einer erzeugten Stranglänge von 100 mm wurden anionische, 15 % hydrolysierte Polyacrylamide mit einem Molekulargewickt von 1,5 x 107 dem Kühlwasser beigemischt. Hierzu wurde aus einem Vorratstank eine wässrige Lösung mit 10 bis 50 g Polyacrylamiden pro Liter Lösung über eine Dosierpumpe direkt in die Hauptkühlwasserleitung eingespiesen. Die im Kühlmittel eingestellte Konzentration der Polyacrylamide betrug 5 - 25 mg pro Liter Wasser. Die Zufuhr der Polyacrylamide wurde nach dem Anfahren während des weiteren Gießvorganges unterbrochen.On a vertical continuous caster with an electromagnetic mold, an alloy 3004 was cast under normal conditions into bars of the format 500 mm x 1600 mm. The cooling water supply was kept constant at 600 liters / minute during the entire casting process. Anionic, 15% hydrolyzed polyacrylamides with a molecular weight of 1.5 × 10 7 were added to the cooling water up to a strand length of 100 mm. For this purpose, an aqueous solution containing 10 to 50 g of polyacrylamides per liter of solution was fed directly into the main cooling water pipe from a storage tank. The concentration of polyacrylamides in the coolant was 5 - 25 mg per liter of water. The supply of the polyacrylamides was interrupted after the start-up during the further casting process.
Bei Einhaltung dieser Konzentrationen des Zusatzes im Kühlwasser während des Anfahrvorganges bildete sich als Folge der verminderten Kühlwirkung ein praktisch wölbungs- und rißfreier Strangguß aus.If these concentrations of the additive in the cooling water were adhered to during the start-up process, as a result of the reduced cooling effect, a continuous curvature and crack-free continuous cast formed.
Claims (4)
characterized in that
as the additive partially hydrolyzed anionic polyacrylamides are used, having a molecular weight of from 106 to 5 x 107.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82810487T ATE17451T1 (en) | 1981-11-20 | 1982-11-12 | METHOD OF COOLING A CASTING STRAND DURING CONTINUOUS CASTING. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH7449/81 | 1981-11-20 | ||
CH744981 | 1981-11-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0080433A1 EP0080433A1 (en) | 1983-06-01 |
EP0080433B1 true EP0080433B1 (en) | 1986-01-15 |
Family
ID=4325298
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82810487A Expired EP0080433B1 (en) | 1981-11-20 | 1982-11-12 | Method of cooling a cast strand during continuous casting |
Country Status (10)
Country | Link |
---|---|
US (1) | US4473106A (en) |
EP (1) | EP0080433B1 (en) |
JP (1) | JPS5893548A (en) |
AT (1) | ATE17451T1 (en) |
AU (1) | AU555976B2 (en) |
CA (1) | CA1201273A (en) |
DE (1) | DE3268600D1 (en) |
IS (1) | IS1379B6 (en) |
NO (1) | NO157888C (en) |
ZA (1) | ZA828266B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4610295A (en) * | 1983-11-10 | 1986-09-09 | Aluminum Company Of America | Direct chill casting of aluminum-lithium alloys |
US4593745A (en) * | 1983-11-10 | 1986-06-10 | Aluminum Company Of America | Fire retardant continuous casting process |
US4582118A (en) * | 1983-11-10 | 1986-04-15 | Aluminum Company Of America | Direct chill casting under protective atmosphere |
JPH06297404A (en) * | 1993-04-13 | 1994-10-25 | Miyanaga:Kk | Guide plate for chain saw |
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 |
CA2332933C (en) | 1998-07-10 | 2007-11-06 | Ipsco Inc. | Method and apparatus for producing martensite- or bainite-rich steel using steckel mill and controlled cooling |
FI20001945A (en) * | 2000-09-05 | 2002-03-06 | Outokumpu Oy | Method and apparatus for cooling in upward continuous continuous casting of metals |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3397734A (en) * | 1966-05-31 | 1968-08-20 | Standard Oil Co | Polybutene continuous metal casting lubrication process |
US4166495A (en) * | 1978-03-13 | 1979-09-04 | Aluminum Company Of America | Ingot casting method |
-
1982
- 1982-10-25 US US06/436,569 patent/US4473106A/en not_active Expired - Fee Related
- 1982-10-27 IS IS2762A patent/IS1379B6/en unknown
- 1982-11-11 AU AU90383/82A patent/AU555976B2/en not_active Ceased
- 1982-11-11 ZA ZA828266A patent/ZA828266B/en unknown
- 1982-11-12 AT AT82810487T patent/ATE17451T1/en not_active IP Right Cessation
- 1982-11-12 DE DE8282810487T patent/DE3268600D1/en not_active Expired
- 1982-11-12 EP EP82810487A patent/EP0080433B1/en not_active Expired
- 1982-11-18 NO NO823860A patent/NO157888C/en unknown
- 1982-11-19 JP JP57203517A patent/JPS5893548A/en active Granted
- 1982-11-19 CA CA000415970A patent/CA1201273A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
AU9038382A (en) | 1983-05-26 |
NO823860L (en) | 1983-05-24 |
IS1379B6 (en) | 1989-08-28 |
AU555976B2 (en) | 1986-10-16 |
ZA828266B (en) | 1983-09-28 |
JPS5893548A (en) | 1983-06-03 |
ATE17451T1 (en) | 1986-02-15 |
NO157888B (en) | 1988-02-29 |
JPH0215302B2 (en) | 1990-04-11 |
IS2762A7 (en) | 1983-05-21 |
EP0080433A1 (en) | 1983-06-01 |
DE3268600D1 (en) | 1986-02-27 |
US4473106A (en) | 1984-09-25 |
CA1201273A (en) | 1986-03-04 |
NO157888C (en) | 1988-06-08 |
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