EP1464422A1 - Verfahren zur Optimierung der Randbereiche von Strangoberflächen gegossener Brammen - Google Patents
Verfahren zur Optimierung der Randbereiche von Strangoberflächen gegossener Brammen Download PDFInfo
- Publication number
- EP1464422A1 EP1464422A1 EP04003456A EP04003456A EP1464422A1 EP 1464422 A1 EP1464422 A1 EP 1464422A1 EP 04003456 A EP04003456 A EP 04003456A EP 04003456 A EP04003456 A EP 04003456A EP 1464422 A1 EP1464422 A1 EP 1464422A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strand
- mold
- cast
- spray water
- spray
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims description 14
- 239000007921 spray Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000005266 casting Methods 0.000 claims description 15
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 abstract 3
- 229910001018 Cast iron Inorganic materials 0.000 abstract 2
- 238000001816 cooling Methods 0.000 description 14
- 239000000843 powder Substances 0.000 description 9
- 230000010355 oscillation Effects 0.000 description 8
- 239000002826 coolant Substances 0.000 description 5
- 239000000155 melt Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
-
- 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 invention relates to a method for optimizing edge areas of the Strand surfaces in continuous casting plants with mold cast blocks, billets Slabs or the like, in particular thin slabs.
- oscillation marks On the strand surfaces, for example, in the edge areas of the thin slabs are alternating Sections without or alternating with relatively weak to pronounced There are oscillation marks. These oscillation marks are in the Edge area of the rolled strip visible as a shadow and restrict it Use one. Such shadows usually have a width of up to 250 mm, starting from the band edge.
- the casting powder / granulate layer there is also alternating in the edge area of the Casting format no or an alternating weak to strong casting powder ejection to observe. It is believed that between the strength of the casting powder and the creation of the oscillation marks consists.
- Document WO 02/060619 A1 describes a strand guide segment for guiding and cooling the cast strand of a continuous casting installation, comprising a roller bridge formed with cross members and guide rollers between side walls and a coolant supply for the secondary cooling of the cast strand and the frame cooling, these having a coolant distribution and connectable to this Distribution pipes, spray pipes and spray nozzles at the ends are provided.
- the strand guide segment has water-conducting trusses with truss areas which are coupled by vertical chambers in such a way that for the middle area in accordance with the smallest strand width or for the first outer area in accordance with the mean strand width or for the second outer area in accordance with the maximum Strand width a coolant supply is provided.
- the coolant supply for the secondary cooling of the cast strand and the frame cooling consists of a water distribution and distributor pipes, spray pipes and spray nozzles connected to the end.
- Document DE 24 01 263 A1 discloses a cooling system for the secondary cooling section a continuous caster.
- the cooling system for the secondary cooling section in which the strand is cooled by means of spray water, is that its Edge areas are cooled less than the other areas, which achieves this that the spray width of the rays appearing on the strand surface thanks to adjustable covers between the spray nozzles and the strand is adjustable.
- the covers can be in the form of panels near the nozzle be arranged.
- JP 022 906 56 A discloses means for controlling the quantity of penetration of mold powder in the production of a cast strand and for reaching one excellent surface characteristics due to a distance between the mold and the solidified shell of the casting according to the material to be cast.
- the vertical oscillation is periodically transferred to a mold with a wide and narrow side.
- the clamping force of the upper and lower clamping means is increased or reduced in order to regulate the amount of mold powder penetrating between the mold and the solidified shell of the cast strand.
- Document JP 612 459 49 A discloses a method for eliminating the variable factors of harmful influences on the quality of a continuous cast product by maintaining the temperature of a melt in contact with the inner side walls of a mold, in particular in a meniscus position in the region of the solidification point of the melt or above it.
- the melt is fed into the mold from a funnel via an immersion tube.
- the melt is maintained at a temperature corresponding to or above the solidification point of the metal by generating heat from an inductor in the upper region of the mold, so that a completely molten metal layer is formed.
- This is then cooled for solidification by means of cooling water pipes in the subsequent area of the mold, until it is completely solidified.
- the cast strand is then cooled further in a cooling spray zone and pulled out of the mold by pinch rollers.
- the cast strand produced is free of oscillation marks and contains no non-metallic inclusions below the surface of the cast skin of the strand produced.
- Document BE 893 777 A discloses a method in which, in a continuous casting process, in particular for steel, the wall of the upper region of a mold is cooled in the area of nitration during metal solidification with a lower cooling intensity than the lower region of the mold.
- the different cooling can be achieved by two separate water cooling circuits, if necessary by supplying coolant with different thermal conductivity, by increasing the thickness of a powder coating or material covering at the corners of the mold, by heating the upper area of the mold or by using inserts with lower thermal conductivity than copper in the upper area of the mold.
- the different cooling effect reduces the tendency to form oscillation marks in the cast strand.
- the object of the invention to avoid or greatly reduce casting powder ejection in order to thus avoiding the oscillation marks that would otherwise be in the edge area of the rolled strip would be visible as shadows.
- the measure can be used, for example be preferably to switch off the spray water quantities in the spray ring or at least to reduce significantly below the current spray water quantities an increase in water vapor between the inner wall of the mold and the strand in the Avoid edge area of the casting format, leading to ejection of casting powder can lead.
- Rising water vapor between the inner wall of the mold and the strand reduces the heat transfer, at least in the edge area of the mold.
- An uneven heat flow density across the mold width has a negative impact on the surface quality.
- the amount of water spray between 0 and max. 50 l / min per meter of casting width.
- the spray water pressure is between 0 and Max. 2 bar.
- the method according to the invention is straightforward and efficient and it solves in an optimal way Way, the task of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Die Bauart ist übersichtlich, kompakt und auf jede Strangbreite optimal durch Zuund Abschalten entsprechender Druckwasserzuführungen an die jeweils aktuelle Strangbreite anpassbar.
Mit Hilfe dieser Methode wird die Entstehung eines Durchbruchs vermindert und eine Reduktion von Oszillationsmarken mit dem Ergebnis einer besseren Oberflächencharakteristik des Gussstranges erreicht.
Der erzeugte Gussstrang ist frei von Oszillationsmarken und enthält keine nichtmetallischen Einschlüsse unterhalb der Oberfläche der Gusshaut des erzeugten Stranges.
Die unterschiedliche Kühlung kann erreicht werden durch zwei separate Wasserkühlungs-Kreisläufe, ggf. durch Zufuhr von Kühlmittel mit unterschiedlicher thermaler Leitfähigkeit, durch Erhöhen der Dicke einer Gießpulverschicht oder Materialabdeckung an den Ecken der Kokille, durch Aufheizen des oberen Bereichs der Kokille oder durch Verwendung von Einlagen mit geringerer thermischer Leitfähigkeit als Kupfer im oberen Bereich der Kokille.
Die unterschiedliche Kühlwirkung reduziert die Tendenz zur Ausbildung von Oszillationsmarken bei dem Gussstrang.
dass der gegossene Strang zwischen Kokillenaustritt und dem ersten Strangführungsrollenpaar bzw. dem Führungsgitter mit einer vergleichsweise geringen Spritzwassermenge je Meter Gießbreite beaufschlagt wird.
Mit der Erfindung werden diese Nachteile signifikant vermindert.
Dabei kann beispielsweise die Spritzwassermenge zwischen 0 und max. 50 l/min je Meter Gießbreite betragen.
Claims (5)
- Verfahren zur Optimierung von Randbereichen der Strangoberflächen in Stranggießanlagen mit Kokille gegossener Blöcke, Billets, Brammen oder dergleichen, insbesondere von Dünnbrammen,
dadurch gekennzeichnet, dass der gegossene Strang zwischen Kokillenaustritt und dem ersten Strangführungsrollenpaar bzw. dem Führungsgitter mit einer vergleichsweise geringeren Spritzwassermenge (l/min je Meter Gießbreite) beaufschlagt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass die Spritzwassermenge zwischen Null und max. 50 l/min je Meter Gießbreite beträgt. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Spritzwasserdruck zwischen Null und max. 2 bar liegt. - Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, dass der gegossene Strang unterhalb des Kokillenaustritts bereichsweise trocken d.h. ohne Spritzwasser gefahren wird. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass die Spritzwassermengen im Spritzring abgeschaltet oder zumindest deutlich unterhalb der aktuellen Spritzwassermengen reduziert werden.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10310872 | 2003-03-11 | ||
DE10310872 | 2003-03-11 | ||
DE10329030 | 2003-06-27 | ||
DE10329030A DE10329030A1 (de) | 2003-03-11 | 2003-06-27 | Verfahren zur Optimierung der Randbereiche von Strangoberflächen gegossener Brammen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1464422A1 true EP1464422A1 (de) | 2004-10-06 |
Family
ID=32851858
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04003456A Ceased EP1464422A1 (de) | 2003-03-11 | 2004-02-17 | Verfahren zur Optimierung der Randbereiche von Strangoberflächen gegossener Brammen |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1464422A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109093084A (zh) * | 2018-09-29 | 2018-12-28 | 东北大学 | 一种连铸薄板坯的生产方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE893777A (fr) * | 1981-07-08 | 1983-01-06 | Centre Rech Metallurgique | Perfectionnements aux procedes de coulee continue des metaux, et lingotiere pour la mise en oeuvre de ces procedes |
JPS61245949A (ja) * | 1985-04-22 | 1986-11-01 | Sumitomo Metal Ind Ltd | 連続鋳造方法 |
JPH02290656A (ja) * | 1988-12-08 | 1990-11-30 | Kawasaki Steel Corp | 竪型連続鋳造用鋳型の振動方法 |
JPH10263778A (ja) * | 1997-03-24 | 1998-10-06 | Kawasaki Steel Corp | 連続鋳造における鋳片の二次冷却方法 |
JP2002248553A (ja) * | 2001-02-27 | 2002-09-03 | Sumitomo Metal Ind Ltd | 連続鋳造鋳片の二次冷却制御方法 |
-
2004
- 2004-02-17 EP EP04003456A patent/EP1464422A1/de not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE893777A (fr) * | 1981-07-08 | 1983-01-06 | Centre Rech Metallurgique | Perfectionnements aux procedes de coulee continue des metaux, et lingotiere pour la mise en oeuvre de ces procedes |
JPS61245949A (ja) * | 1985-04-22 | 1986-11-01 | Sumitomo Metal Ind Ltd | 連続鋳造方法 |
JPH02290656A (ja) * | 1988-12-08 | 1990-11-30 | Kawasaki Steel Corp | 竪型連続鋳造用鋳型の振動方法 |
JPH10263778A (ja) * | 1997-03-24 | 1998-10-06 | Kawasaki Steel Corp | 連続鋳造における鋳片の二次冷却方法 |
JP2002248553A (ja) * | 2001-02-27 | 2002-09-03 | Sumitomo Metal Ind Ltd | 連続鋳造鋳片の二次冷却制御方法 |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 011, no. 094 (M - 574) 25 March 1987 (1987-03-25) * |
PATENT ABSTRACTS OF JAPAN vol. 015, no. 061 (M - 1081) 13 February 1991 (1991-02-13) * |
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 01 29 January 1999 (1999-01-29) * |
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 01 14 January 2003 (2003-01-14) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109093084A (zh) * | 2018-09-29 | 2018-12-28 | 东北大学 | 一种连铸薄板坯的生产方法 |
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