WO2003035306A1 - Verfahren und vorrichtung zum optimieren der kühlkapazität einer stranggiesskokille für flüssige metalle, insbesondere für flüssigen stahl - Google Patents
Verfahren und vorrichtung zum optimieren der kühlkapazität einer stranggiesskokille für flüssige metalle, insbesondere für flüssigen stahl Download PDFInfo
- Publication number
- WO2003035306A1 WO2003035306A1 PCT/EP2002/011481 EP0211481W WO03035306A1 WO 2003035306 A1 WO2003035306 A1 WO 2003035306A1 EP 0211481 W EP0211481 W EP 0211481W WO 03035306 A1 WO03035306 A1 WO 03035306A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mold
- coolant
- continuous casting
- cross
- sectional area
- Prior art date
Links
- 238000009749 continuous casting Methods 0.000 title claims abstract description 44
- 238000001816 cooling Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 11
- 239000010959 steel Substances 0.000 title claims abstract description 11
- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 title claims abstract description 9
- 239000002826 coolant Substances 0.000 claims abstract description 151
- 238000005266 casting Methods 0.000 claims description 29
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 22
- 229910052802 copper Inorganic materials 0.000 claims description 22
- 239000010949 copper Substances 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000011089 mechanical engineering Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
Definitions
- the invention relates to a method and a device for optimizing the cooling capacity of a continuous casting mold for liquid metals, in particular for liquid steel, by comparing the thermal load over the height of the continuous casting mold, in which the coolant in each case through a cross-sectional area of a large number of coolant channels or Coolant bores, which run approximately parallel to the casting strand, is guided, the coolant cross-sectional areas between the mold inlet and the mold outlet being designed differently.
- the continuous casting mold referred to at the beginning as a device is known from DE 41 27 333 C2.
- molten steel is poured into a continuous casting mold, the mold walls of which are provided with continuously cylindrical cooling bores extending from top to bottom and connected to a cooling water circuit, the flow cross-sectional areas of which are partially reduced by displacement rods.
- the cooling water is guided through the coolant holes at maximum speed in the area of the highest temperature load.
- the coolant is only directed from the bottom to the top.
- the object of the invention is to control the copper plate skin temperatures on the hot side and the cold side so that both the recrystallization temperature of the cold-rolled copper on the hot side with the greatest possible cooling intensity and with uniform cooling at the height ranges of the continuous casting mold is not exceeded and a possible evaporation of the coolant on the cold side is avoided.
- the object is achieved according to the invention in that the flow rate of the coolant, which is passed from top to bottom in the continuous casting mold, is set higher in the coolant channel or in the coolant bore in the upper region of the continuous casting mold by a smaller cross-sectional area than in the lower region of the continuous casting mold, in which the flow velocity is set lower by a larger cross-sectional area and / or in that the covering with coolant is set by a cross-sectional shape which can vary from top to bottom.
- the advantage is a greater coverage by coolant in the hot area and a lower heat dissipation below the hot area.
- the inlet cross-sectional shape of the coolant channel can be square or rectangular and the continuation in each case from an elongated rectangle up to a square, or the circular inlet cross-sectional shape can be designed analogously.
- a heat flow load of the continuous casting mold of at most 8 MW / m 2 and coolant speeds of 4 m / s to 30 m / s are maintained.
- a maximum thermal load on the mold plates on their hot side is less than 550 ° C. and that the heat transfer coefficient is set up to a maximum of 250,000 W / m 2 K.
- Another measure influencing the thermal values is that the continuous casting mold is oscillated.
- the casting strand is lubricated with casting powder slag in the continuous casting mold.
- Another measure that supports the heat transfer is that the surface of the coolant channels is provided with an increasing roughness from the mold inlet to the mold outlet.
- the object is achieved according to the invention in that the coolant channels or the coolant holes each have a relatively small coolant channel input cross-sectional area and a larger one -Exit- cross-sectional area from the mold inlet to the mold outlet are formed with the greatest coverage by the coolant at the mold entrance (here under "cover” the ratio is s Coolant channel width / coolant channel distance, ie the effective phase boundary layer copper / coolant understood).
- the casting speed can be adjusted in the continuous casting direction up to approximately 12 m / min.
- the invention is also improved in that a thermal load on the continuous casting mold of at most 8 MW / m 2 , a coolant speed of 4 to 30 m / s and a maximum local thermal load on the copper plates on the side facing the liquid metal with a heat transfer coefficient • by Max. 250,000 W / m 2 • K are provided.
- a further embodiment provides that the coolant channels with a rectangular cross section are designed to increase in their channel depth and / or channel width from the mold inlet to the mold outlet.
- An improvement also provides that the cross-sectional area of the coolant channels can be changed by means of baffles via a control or regulation. As a result, the flow of the coolant in the rigid form of the coolant channels can be supplemented by a further function.
- the roughness is formed from dimples of 0.5 to 3 mm in diameter and 0.2 to 2 mm in depth.
- the distribution or the number of dimples from the mold exit to the mold entrance is provided to increase.
- the heat transfer is intensified according to further features in that the roughness can be changed by chemical or mechanical measures.
- the roughness can be changed during the casting process.
- Fig. 1 A (each from left to right) a vertical section through the current continuous casting mold, in the upper part two horizontal partial sections for coolant channels and coolant holes in the upper mold area, in the lower area two horizontal partial sections for coolant channels and coolant holes in the lower mold area, the far right Temperature curve in the copper plates,
- Fig. 1 B analogous to Fig. 1A (each from left to right) a vertical section through the continuous casting mold, in the upper part three horizontal partial sections for coolant channels and coolant holes in the upper mold area, in the lower part three horizontal partial sections for coolant channels and coolant holes in the lower mold area , on the far right is a comparison of the previous surface temperature curve between the previous surface temperature curve and the new surface temperature curve,
- FIG. 2A shows a diagram of the heat transfer coefficient •, the maximum thermal load and the pressure loss in the coolant
- Fig. 2B is a diagram of the heat transfer coefficient •, the pressure loss • P over the coolant speed
- 2C shows a diagram for the decrease in the maximum thermal load with increasing coolant speed.
- a continuous casting mold 1 which consists of copper plates 2 each with a large number of coolant channels 3 or coolant bores 4 with or without displacement rods 4.1 through which the coolant passes 5 is directed.
- the thermal load in the mold level 8 or the maximum heat flow 10 ("J") can now be up to 8 MW / m2, especially at high casting speeds of about 12 m / min and therefore requires special cooling measures to keep the copper plate skin temperatures on the hot side 11.1 and the cold side 1 1.2 in such a way that the recrystallization temperature of the cold-rolled copper on the hot side 11.1 is not exceeded and a possible evaporation of the coolant 5 on the cold side 11.2 is avoided.
- the cooling capacity or the cooling effect is determined by mechanical engineering elements, such as the copper plate thickness 12, the coolant channels 3 or the coolant bores 4 with or without displacement rods 4.1, the distance 13 (A) of the coolant channels 3 or the coolant bores 4 from one another, the cross-sectional area 14 (F ) the coolant channels 3 or the coolant holes 4 and the length of the coolant channels 3 or the coolant bores 4, which corresponds to the mold length 15 (L).
- the cooling channel cross-sectional areas 14 between the mold inlet 6 and the mold outlet 7 can currently be regarded as constant.
- the process-related influencing variables for the cooling capacity of the continuous casting mold 1 are the coolant speed 16, which is an essential measure of the heat transfer coefficient 17 (•), measured in W / im 2 • K.
- FIGS. 2A, 2B and 2C The relationships are shown in FIGS. 2A, 2B and 2C in diagrams.
- the aim of the invention is to minimize the pressure loss 19 (P) during the control of the maximum thermal load 11 (T cu-m a x) both on the hot side 11.1 and the cold side 11.2 and to make the thermal mold load 22 and to achieve the thermal profile 23 over the mold length 15.
- P pressure loss
- T cu-m a x maximum thermal load 11
- the heat transfer coefficient 17 (•) and the maximum thermal load 11 of the copper plate 2 are dependent on the mechanical engineering and process engineering factors, such as
- the casting strand 9 is cast according to FIG. 1B at a casting speed 9.1 of approximately 12 m / min, for example in the casting format of a thin slab with a thickness between 40 mm and 100 mm.
- Casting powder 1.2 and an oscillation 1.1 can be used for casting.
- the casting process loads the continuous casting mold 1 with a maximum heat flow 10 (“J”) in the casting level 8 of 2 to 8 MW / m 2 and leads to a maximum thermal load 11 in the casting level 8 both on the hot side 11.1, which faces the molten steel , as well as on the cold side 11.2, which faces the coolant 5.
- J maximum heat flow 10
- the process leads to a thermal mold load 22 and a heat flow profile 23 over the mold length 15 (L).
- the coolant channel cross-sectional areas 14 (F) in the coolant channels 3 or coolant bores 4 with or without displacement rod 4.1 are constant in the prior art (FIG. 1A) over the mold length 15 and thus lead to a constant coolant speed 16 (V) and a defined coolant pressure drop 19 (• P), which is assumed to be "1".
- FIG. 1B shows the temperature profile of the surface temperature that has changed compared to FIG. 1A, the total amount of heat removed remaining the same.
- the roughness 21 (R) can also optionally be raised functionally from the mold outlet 7 to the mold inlet 6 over the mold length 15.
- the roughness 21 can also be produced by dimples 24 of a maximum of 1-3 mm in diameter and 1-2 mm in depth, which lead to cavitation effects of the flowing coolant 5 (for example the water) at the phase boundary copper (cold side 11.2) and coolant 5 and thus lead to an increased heat transfer coefficient 17 (•), caused by forced convection in the area of the laminar "Nusselt" boundary layer, in which the energy transport takes place via heat conduction.
- the cross-sectional area 14 of the coolant channels 3 or the coolant bores 4 can be enlarged over the mold length 15 in the case of the coolant channels 3 via the channel depth 3.1 and / or the channel width 3.2.
- the cross-sectional enlargement can be realized by increasing the diameter of the coolant bore 4 and / or reducing the diameter of the displacement rod 4.1.
- guide plates 3.3 of the coolant channels 3 are mechanically or manually, for example on a changed cross-sectional area 14 of the coolant channels 3 via the mold height 15, e.g. online, process-controlled by means of a control or regulation 3.3.1 of the position of the guide plates 3.3.
- the thermal mold load 22 can be reduced over the mold length 15 by means of a uniform thermal profile 22.1, as shown in a diagram in the right part of FIG. 1B.
- the diagram 2A shows the heat transfer coefficient 17 (•) measured in W / m 2 K, the pressure loss 19 (• P) and the local maximum thermal load 11 of the copper plate 2 in the mold level 8 as a function of the roughness 21 of the surface of the coolant channels 3 or the coolant bores 4 with a constant copper plate thickness 12, coolant speed 16 (V in m / s), heat flow 10 (J), cross-sectional area 14 of the coolant channel 3 or the coolant bore 4, the mold length 15 and a distance 13 of the coolant channels 3 or coolant bores 4 from one another.
- Diagram 2B shows the heat transfer coefficient 17 (•) and the pressure loss 19 (• P) over the coolant speed 16 (V) or the coolant quantity 20 (Q) with increasing roughness 21 with constant cross section 14 (F), mold length 15 and distance 13 (A).
- 2C shows the decrease in the maximum thermal load 11 in the casting level 8 of the copper plate 2 with increasing coolant speed 16 (V), coolant quantity 20 (Q) and roughness 21 (R) with constant heat flow 10 (“J”), in the heat flow Profile 23 over the mold length 15, the copper plate thickness 12, the coolant channel cross-sectional area 14 (F) and the distance 13 (A) of the coolant channels 3 or the coolant holes 4 are shown.
- the partial image in FIG. 2C makes it clear that the local maximum thermal load 11 in the mold level 8 decreases sharply with increasing roughness 21 (R), the coolant speed 16 (V) or the coolant quantity 20 (Q).
- the principle of the invention can also be applied to strip casting devices which are operated at a casting speed of up to 100 m / min. All the measures applied to the level of the continuous casting mold 1 are transferred to the scope of the twin rollers.
- Coolant hole 4.1 Displacement tube, rod, round body
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02801890A EP1436106A2 (de) | 2001-10-18 | 2002-10-15 | Verfahren und vorrichtung zum optimieren der kühlkapazität einer stranggiesskokille für flüssige metalle, insbesondere für flüssigen stahl |
US10/493,080 US20040256080A1 (en) | 2001-10-18 | 2002-10-15 | Method and device for optimizing the cooling capacity of a continuous casting mold for liquid metals, particularly for liquid steel |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10150919.7 | 2001-10-18 | ||
DE10150919 | 2001-10-18 | ||
DE10201502.3 | 2002-01-17 | ||
DE10201502A DE10201502C1 (de) | 2001-10-18 | 2002-01-17 | Verfahren und Vorrichtung zum Optimieren der Kühlkapazität einer Stranggießkokille für flüssige Metalle, insbesondere für flüssigen Stahl |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003035306A1 true WO2003035306A1 (de) | 2003-05-01 |
WO2003035306A8 WO2003035306A8 (de) | 2003-10-09 |
Family
ID=26010383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/011481 WO2003035306A1 (de) | 2001-10-18 | 2002-10-15 | Verfahren und vorrichtung zum optimieren der kühlkapazität einer stranggiesskokille für flüssige metalle, insbesondere für flüssigen stahl |
Country Status (3)
Country | Link |
---|---|
US (1) | US20040256080A1 (de) |
EP (1) | EP1436106A2 (de) |
WO (1) | WO2003035306A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010015399A1 (de) * | 2008-08-06 | 2010-02-11 | Sms Siemag Ag | Stranggiesskokille für flüssiges metall, insbesondere für flüssigen stahl |
WO2017186702A1 (de) * | 2016-04-27 | 2017-11-02 | Primetals Technologies Austria GmbH | Instrumentierung einer seitenwand einer stranggiesskokille mit lichtwellenleitern |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011093562A1 (ko) * | 2010-01-29 | 2011-08-04 | 주식회사 풍산 | 주조용 몰드 플레이트, 몰드 플레이트 어셈블리 및 몰드 |
IT1403036B1 (it) * | 2010-11-25 | 2013-09-27 | Danieli Off Mecc | Cristallizzatore per colata continua |
JP6274226B2 (ja) * | 2014-01-31 | 2018-02-07 | 新日鐵住金株式会社 | 連続鋳造における鋳造状態の判定方法、装置及びプログラム |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59133940A (ja) * | 1983-01-21 | 1984-08-01 | Mishima Kosan Co Ltd | 連続鋳造用鋳型 |
GB2177331A (en) * | 1985-06-24 | 1987-01-21 | Outokumpu Oy | Continuous casting mould |
JPH0342144A (ja) * | 1989-07-06 | 1991-02-22 | Kawasaki Steel Corp | 連続鋳造用鋳型の冷却方法およびその鋳型 |
FR2661120A3 (fr) * | 1990-04-20 | 1991-10-25 | Siderurgie Fse Inst Rech | Lingotiere de coulee continue de metal liquide equipee de moyens de controle de la solidification du metal liquide. |
US5117895A (en) * | 1987-12-23 | 1992-06-02 | Voest-Alpine Industrieanlagenbau Gesellschaft M.B.H. | Continuous casting mold arrangement |
DE4127333A1 (de) * | 1991-08-19 | 1993-02-25 | Schloemann Siemag Ag | Stahlstranggiesskokille |
EP0730923A1 (de) * | 1995-03-08 | 1996-09-11 | KM Europa Metal Aktiengesellschaft | Kokille zum Stranggiessen von Metallen |
EP1103323A2 (de) * | 1999-11-29 | 2001-05-30 | SMS Demag AG | Verfahren und Vorrichtung zum Stranggiessen von Stahl |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2131307A (en) * | 1935-10-25 | 1938-09-27 | Behrendt Gerhard | Chill for continuous string casting |
ATE195449T1 (de) * | 1994-06-06 | 2000-09-15 | Danieli Off Mecc | Verfahren zum kontrollieren der verformung von seitenwänden einer kokille sowie stranggiesskokille |
DE19831998A1 (de) * | 1998-07-16 | 2000-01-20 | Schloemann Siemag Ag | Stranggießkokille |
US6374903B1 (en) * | 2000-09-11 | 2002-04-23 | Ag Industries, Inc. | System and process for optimizing cooling in continuous casting mold |
-
2002
- 2002-10-15 WO PCT/EP2002/011481 patent/WO2003035306A1/de not_active Application Discontinuation
- 2002-10-15 US US10/493,080 patent/US20040256080A1/en not_active Abandoned
- 2002-10-15 EP EP02801890A patent/EP1436106A2/de not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59133940A (ja) * | 1983-01-21 | 1984-08-01 | Mishima Kosan Co Ltd | 連続鋳造用鋳型 |
GB2177331A (en) * | 1985-06-24 | 1987-01-21 | Outokumpu Oy | Continuous casting mould |
US5117895A (en) * | 1987-12-23 | 1992-06-02 | Voest-Alpine Industrieanlagenbau Gesellschaft M.B.H. | Continuous casting mold arrangement |
JPH0342144A (ja) * | 1989-07-06 | 1991-02-22 | Kawasaki Steel Corp | 連続鋳造用鋳型の冷却方法およびその鋳型 |
FR2661120A3 (fr) * | 1990-04-20 | 1991-10-25 | Siderurgie Fse Inst Rech | Lingotiere de coulee continue de metal liquide equipee de moyens de controle de la solidification du metal liquide. |
DE4127333A1 (de) * | 1991-08-19 | 1993-02-25 | Schloemann Siemag Ag | Stahlstranggiesskokille |
EP0730923A1 (de) * | 1995-03-08 | 1996-09-11 | KM Europa Metal Aktiengesellschaft | Kokille zum Stranggiessen von Metallen |
EP1103323A2 (de) * | 1999-11-29 | 2001-05-30 | SMS Demag AG | Verfahren und Vorrichtung zum Stranggiessen von Stahl |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 008, no. 262 (M - 341) 30 November 1984 (1984-11-30) * |
PATENT ABSTRACTS OF JAPAN vol. 015, no. 178 (M - 1110) 8 May 1991 (1991-05-08) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010015399A1 (de) * | 2008-08-06 | 2010-02-11 | Sms Siemag Ag | Stranggiesskokille für flüssiges metall, insbesondere für flüssigen stahl |
WO2017186702A1 (de) * | 2016-04-27 | 2017-11-02 | Primetals Technologies Austria GmbH | Instrumentierung einer seitenwand einer stranggiesskokille mit lichtwellenleitern |
Also Published As
Publication number | Publication date |
---|---|
US20040256080A1 (en) | 2004-12-23 |
WO2003035306A8 (de) | 2003-10-09 |
EP1436106A2 (de) | 2004-07-14 |
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