EP1047510B1 - Method and installation for the continuous production of hot-rolled, thin flat products - Google Patents
Method and installation for the continuous production of hot-rolled, thin flat products Download PDFInfo
- Publication number
- EP1047510B1 EP1047510B1 EP98962221A EP98962221A EP1047510B1 EP 1047510 B1 EP1047510 B1 EP 1047510B1 EP 98962221 A EP98962221 A EP 98962221A EP 98962221 A EP98962221 A EP 98962221A EP 1047510 B1 EP1047510 B1 EP 1047510B1
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- European Patent Office
- Prior art keywords
- stand
- strip
- train
- hot strip
- rolled
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009434 installation Methods 0.000 title claims abstract 6
- 238000010924 continuous production Methods 0.000 title claims description 6
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 claims abstract description 43
- 238000005266 casting Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims description 73
- 239000000463 material Substances 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 13
- 229910001566 austenite Inorganic materials 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 230000001419 dependent effect Effects 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 238000005461 lubrication Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims 6
- 238000007688 edging Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 239000011261 inert gas Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 description 24
- 239000007858 starting material Substances 0.000 description 8
- 230000009466 transformation Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/02—Austenitic rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/04—Ferritic rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/16—Two-phase or mixed-phase rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/06—Threading
- B21B2273/08—Threading-in or before threading-in
Definitions
- the invention relates to a production method and a system for endless Production of hot rolled thin flat products from thin cast Band, consisting of a single-skid road, a multi-skid Finishing line, an outfeed roller table with facilities for cooling the hot strip and the cooling devices upstream and downstream winding machines for Winding up the hot strip.
- slabs are used as the starting material a thickness greater than 120 mm or thin slabs with thicknesses between 40 and 120 mm used.
- the rolling mills generally consist of a single or multi-stand rough street in which the slabs in several Rolling passes are reduced in reverse operation, as well as a multi-stand Prefabricated street or a Steckel scaffold.
- the hot strip length is either between a preliminary and a Finishing line, by speed-up in the finishing line or by coiler in front and reached behind the Steckel scaffold. In these cases it is a discontinuous process, i.e. Rough and finishing lines generally work decouples and roll the individual slabs.
- the former consist of a multi-stand finishing train with an outfeed roller table Devices for cooling the hot strip to winding temperature and Winding machines for winding up the hot strip.
- the plants for thin slabs> 65 mm exist due to the same final thickness necessary larger deformation work from a single or multi-stand Vorstrasse with more than one roll pass and a multi-stand finishing train as well as an outfeed roller table with facilities for cooling the hot strip Winding temperature and winding machines for winding the hot strip. Between There are facilities for heating and / or winding in the front and finishing lines of the preliminary strip, which is the necessary entry temperature of the hot strip into the Ensure the finishing train over the length of the hot strip.
- the rolling mills are generally designed and operated so that the Forming in the individual stitches fully austenitic or mixed austenitic-ferritic.
- the rolling temperature is above that in all passes GOS line of the iron-carbon diagram, with the finish rolling temperature in the last scaffolding of the finishing train to achieve a fine-grained structure should be above the GOS line.
- the rolling temperature is in the last Scaffolding of the finishing train below the GOS line in the range from approx. 810 to 890 ° C.
- This can be achieved with the same final thickness by lowering the Furnace outlet temperature of the slabs can be reached, which increases the proportion of in Solution micro-alloy elements is reduced and the quality of the Hot strip lowers.
- There is also a reduction in the rolling speed without a lowering of the furnace outlet temperature of the slabs is possible, whereby a the rolling stock is cooled more intensely. But that leads to the disadvantage of one reduced production. It is also possible to combine both measures with the disadvantages already mentioned.
- the final rolling temperature is reduced to a minimum 720 ° C through those already mentioned for mixed austenitic-ferritic rolling Measures including their disadvantages.
- the ferritic area is only in the Last two to three passes were achieved, causing the decrease in this area is low.
- the conversion point lies (in the middle) within the finishing street and shifts as a result of temperature influences between the scaffolds Rolling force drops due to the lower deformation resistance of the material in the leads ferritic temperature range. This is disadvantageous for the roll bending and Roller adjustment systems to ensure thickness, profile and contour as well Flatness of the hot strip, as these systems measure the rolling force as Use output signal.
- EP 0 761 325 A1 is behind a multi-stand rolling mill Outfeed roller table, facilities for cooling the hot strip and downstream Winding machines for winding up the austenitic rolled hot strip second downstream single or multi-stand rolling mill for ferritic rolling proposed by hot strip. That in the first multi-stand rolling mill The hot strip is initially austentitically deformed with the help of the between the two Mills arranged devices for cooling in the ferritic Cooled temperature range.
- the downstream single or multi-stand rolling mill is used exclusively for ferritic rolling, which practically means two rolling trains are required, which represents a high investment in plant technology.
- EP 0 761 326 A1 proposes a production plant consisting of a multi-stand rolling mill, an outfeed roller table with facilities for cooling of the hot strip and downstream winding machines, in which at least that the first scaffold is designed as a reversing scaffold with at least one coiler are upstream and downstream, between the upstream reel furnace and the following reversing frame a controllable cooling device is provided. After this Rolling the hot strip in the austenitic temperature range becomes the hot strip cooled in the ferritic temperature region by means of the controllable cooling device and wound up in the reel furnace. The structural transformation takes place in the reel furnace. Then it is reversed by the one downstream of the coiler Rolled mill in the ferritic temperature range. Austenitic rolling is not cooled. The hot strip can be between the Rolling mills are heated. Different arrangements of scaffolding and Coiler furnaces are proposed. The characteristic is in any case Reverse operation, making the proposed production facility not endless can roll continuously. Increase the additional reel furnace (s) required the plant engineering effort.
- Production plants for rolling hot strip are also known Thin slabs in which a single or multi-stand rough road facilities for cooling and heating are subordinate. These facilities are one Multi-stand finishing train with an outfeed roller table, facilities for cooling and winding machines for winding the hot strip downstream.
- At least two roll passes are made in austenitic in the Vorstrasse Temperature range, either in multiple stands in continuous operation or in a single stand in reverse operation.
- the hot strip is used in the facilities Cooling between the roughing and finishing lines to the temperature of the respective one Temperature range cooled and then ferritic or in the finishing train mixed austenitic-ferritic finish-rolled.
- All known or proposed production systems is the run of the Starting material through a furnace or an inductive heating system for Purpose of heating or temperature compensation across thickness and width or the homogenization of the starting material before rolling together.
- the known production plants need facilities for descaling the Starting material before the first stitch and before the finishing train.
- the need the descaling of the starting material before the first stitch results from the scaling of the surface of the starting material during this Pass through a heating, equalizing or homogenizing furnace or one inductive heating system.
- the need for descaling before The finishing mill results from the secondary scaling of the hot strip in the Area of the Vorstrasse and between the Vorstrasse and Fertigstrasse.
- the production process in the known or proposed production facilities is discontinuous or in the case of welding hot strip after Vorides only continuously in the finishing train.
- Roll gap lubrication can be carried out in the scaffolding of the roughing and finishing train known production plants only after tapping the raw material or of the hot strip in the respective scaffolding, otherwise the Gripping condition is not guaranteed.
- the associated with the roll gap lubrication Reduction The friction between the rolling stock and the roll leads to a reduction in the Resistance to deformation and thereby the rolling force, the rolling moment and the required drive power.
- the surface quality of the hot strip is elevated.
- these advantages do not arise for the tapping piece of the Hot strip, which after rolling out a considerable part of the length of the Makes up hot strip.
- the production facilities for the Load condition can be designed without roll gap lubrication.
- the object of the invention is to: Production plant for the austenitic, the mixed austenitic-ferritic and the ferritic rolling of thin hot strip in an endlessly fully continuous To create a process that eliminates the aforementioned drawbacks and problems and on which all three previously mentioned technologies can be realized
- the task is solved with a production plant of the type mentioned at the beginning Art according to the invention in that the cast in a thickness of 5 - 18 mm Belt before reaching the single-deck forecourt under a protective gas atmosphere controlled cooled and the pre-rolled hot strip in one of the rough streets downstream device either controlled cooled, heated or on Temperature is maintained and the edges of the hot strip are reheated.
- the production process is specially designed for rolling thin cast strip all three possible technologies, i.e. the austenitic, the austenitic-ferritic and the ferritic rolling.
- the austenitic the austenitic-ferritic and the ferritic rolling.
- the rolling temperature in the austenite region is in the single-stand forecourt by variably controlled cooling of the casting belt in front of the Vorstrasse set.
- the thickness is 5 to 18 mm under an adjustable protective gas atmosphere required parameters temperature, austenite starting grain size, the degree of Scale and chemical composition of the scale before the first Roll stitch set.
- carbon steels, low-alloy steels are low Carbonized steels and microalloyed steels through a material-dependent acceptance from 45 to 70% in the single-armed Vorstrasse in connection with the in austenitic range of variably adjustable rolling temperature and which adapts to the Forming subsequent cooling, heating or maintaining the temperature until Recrystallize entry into the multi-stand finishing train and the initial grain size of the casting belt with one stitch greatly reduced, but at least halved becomes.
- the Rolling temperature before the multi-stand finishing train through the behind the roughing train arranged device for controllable cooling, heating or holding the Hot strip temperature optionally in the austenite or ferrite area or in the Transition range from austenite to ferrite is selectively adjustable.
- the rolling temperature in the hot strip becomes a fine-grained structure grain size classes 6 - 10 according to DIN 50601.
- the material-dependent high decrease of 45 - 70% in the one-stand forelevel and the variably controllable cooling, heating or maintaining the temperature of the Hot strip is the recrystallized hot strip before it enters the finishing train and greatly reduced the starting grain size of the casting belt.
- ferritic is endless and the mixed austenitic-ferritic endless continuously rolled hot strip immediately after the exit from the last scaffolding of the multi-stand finishing train in heat-insulated Winding machines wound into a bundle and one homogeneous across the bundle width is subjected to slow cooling.
- the thin casting belt is provided with a starting piece, suggested that the approach piece be the open scaffolding of the Vorstrasse and the Multi-stand finishing train passes undeformed in the rolling direction and with scissors is separated from the rest of the casting line.
- the rollers already during the closing of the open scaffolding of the single scaffold road and the multi-stand finishing train to the final thickness required for rolling to lubricate the intended nip.
- the roll gap lubrication during the entire rolling time takes place, the wear on the work rolls decreases, which means that the thickness and profile of the total hot strip length can be improved and the service life of the rollers is increased.
- the single-arm Vorstrasse and the multi-stand finishing train on the for rolling the required final thickness values provided and after chopping the while of the rolling process rolled hot strip by means of scissors the stationary Condition of fully continuous endless rolling of thin casting belt has been reached and the austenitic, mixed austenitic-ferritic or ferritically rolled Hot strip can be cut into bundle lengths using scissors.
- the invention provides that the degree of scaling on the Surface of the raw material and the chemical composition of the Tinder by controllable cooling of the casting belt under a protective gas atmosphere is specifically set until the first roll pass.
- the invention results in an overall system concept with which in an optimal manner a fully continuous endless rolling process can be realized, all three possible rolling technologies for the production of hot strip, i.e. the austenitic, which allows mixed austenitic-ferritic and ferritic rolling.
- a production system with which continuous and continuous casting of thin casting tape Strip material with small thicknesses both austenitic and ferritic as well as mixed austenitic-ferritic with a total decrease of at least 65% based on the entire system can be manufactured is in the single drawing figure shown and will be described below.
- It consists of one Thin slab caster 12, a first device 2 for cooling the casting belt under protective gas, a single-stand Vorstrasse 3, a multi-stand finishing train 5, a second device 4 for optionally cooling, heating or holding the Temperature of the hot strip between roughing and finishing mill, a pair of scissors 6 for Cutting the hot strip from bundle to bundle, using a run-out roller table Means 8 for cooling the rolled hot strip and one of the finishing train 5 downstream winding machines 10 for winding the finished tape
- the rolling process begins with the targeted cooling of the solidified Casting belt with a thickness of 5 to 18 mm under an adjustable protective gas atmosphere, whereby the technologically required parameters temperature, austenite starting grain size Degree of scaling and the chemical composition of the scale before first roll pass can be set
- the approach piece of the thin casting belt passes through the open undeformed Scaffolding of the single-stand Vorstrasse 3 and the multi-stand finishing street 5 in Rolling direction 11 and with the scissors 6 downstream of the finishing train remaining casting belt separated with one or more cuts.
- a roller gap lubrication can be applied to the stands while the stands are still being closed Roll gaps provided for rolling the required final thickness as the gripping condition is due to the continuous up to the nip position increasing decrease is guaranteed.
- the source material is endless in the single-storey Vorstrasse 3 with a material-dependent decrease of 45 to 70% for carbon steels, low alloy Steels, low-carbon and micro-alloyed steels in a horizontal stitch in austenitic temperature range rolled.
- edges of the casting belt are in front of the horizontal stitch in a single-stand Vor No 3 flanged vertical frame using special compression calibers slightly deformed, which means that the casting belt is simultaneously centered in the single-arm Vorstrasse arrives.
- the hot strip passes through a device 4 for controllable Cooling, heating or maintaining the temperature, thereby reducing the temperature of the Hot strip before entering the multi-stand finishing train 5 targeted in the austenite or is adjustable in the ferrite area or in the transition area from austenite to ferrite
- the material-dependent high decrease of 45 - 70% in the single-storey Vorstrasse 3 and the means 4 for controllable cooling, heating or holding the Temperature adjustable temperature of the hot strip is the hot strip before its entry into the finishing train recrystallized and the starting grain size of the Casting belt greatly reduced.
- the hot strip is processed with a total material-dependent decrease of more than 50% to thin hot strip rolled, which in connection with the specifically adjustable rolling temperature fine-grained structure after rolling.
- the ferritic and the mixed austenitic-ferritic endless fully continuous Rolled hot strip is insulated immediately after the finishing train Winding machines 7 wound into a bundle.
- the austenitic, endless, fully continuously rolled hot strip runs through Leaving the finishing train 5, a cooling section 8 with forced cooling of and then a device for cooling the hot strip Winding temperature with targeted structural transformation.
- the production system is adjusted once after starting up, after which one constant high quality of the hot strip over its length in the endless fully continuous process is achieved.
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Abstract
Description
Die Erfindung betrifft ein Produktionsverfahren und eine -anlage zur endlosen Erzeugung von warmgewalzten dünnen Flachprodukten aus dünnem gegossenem Band, bestehend aus einer eingerüstigen Vorstrasse, einer mehrgerüstigen Fertigstrasse, einem Auslaufrollgang mit Einrichtungen zum Kühlen des Warmbandes sowie den Kühleinrichtungen vor- und nachgeordneten Wickelmaschinen zum Aufwickeln des Warmbandes.The invention relates to a production method and a system for endless Production of hot rolled thin flat products from thin cast Band, consisting of a single-skid road, a multi-skid Finishing line, an outfeed roller table with facilities for cooling the hot strip and the cooling devices upstream and downstream winding machines for Winding up the hot strip.
Zur Erzeugung warmgewalzter Bänder werden als Ausgangsmaterial Brammen mit einer Dicke größer 120 mm oder Dünnbrammen mit Dicken zwischen 40 und 120 mm verwendet. Im Fall einzelner Brammen bestehen die Walzanlagen im allgemeinen aus einer ein- oder mehrgerüstigen Vorstrasse in der die Brammen in mehreren Walzstichen im Reversierbetrieb reduziert werden, sowie einer mehrgerüstigen Fertigstrasse oder einem Steckelgerüst. Die annähernd gleichmäßige Temperatur über die Warmbandlänge wird entweder mittels einer Coilbox zwischen Vor- und Fertigstrasse, durch Speed-up in der Fertigstrasse oder durch Haspelöfen vor und hinter dem Steckelgerüst erreicht. In diesen Fällen handelt es sich um einen diskontinuierlichen Prozeß, d.h. Vor- und Fertigstrasse arbeiten im allgemeinen entkoppelt und walzen die einzelnen Brammen.To produce hot-rolled strips, slabs are used as the starting material a thickness greater than 120 mm or thin slabs with thicknesses between 40 and 120 mm used. In the case of individual slabs, the rolling mills generally consist of a single or multi-stand rough street in which the slabs in several Rolling passes are reduced in reverse operation, as well as a multi-stand Prefabricated street or a Steckel scaffold. The almost uniform temperature The hot strip length is either between a preliminary and a Finishing line, by speed-up in the finishing line or by coiler in front and reached behind the Steckel scaffold. In these cases it is a discontinuous process, i.e. Rough and finishing lines generally work decouples and roll the individual slabs.
Bei einer aus der EP 753 359 A1 bekannten Anlage werden die in der Vorstrasse gewalzten Vorbänder zweier Brammen zwischen Vor- und Fertigstrasse an Kopf und Fuß mit Hilfe einer Erwärmungs- und Anpressvorrichtung verschweißt. Die Naht zwischen den beiden Vorbändern wird anschließend mechanisch bearbeitet, bevor das Vorband in die Fertigstrasse einläuft. In der Fertigstrasse wird dann endlos gewalzt, während die Vorstrasse diskontinuierlich arbeitet. Nachteilig sind die mit einer Naht verbundenen Probleme der Prozeßstabilität und der Warmbandqualität im Bereich des ausgewalzten Stückes der Naht. Ein ferritisches oder gemischt austenitisch-ferritisches Walzen ist nur mit der Gefügeumwandlung in der Fertigstrasse mit den bereits genannten Nachteilen möglich.In a system known from EP 753 359 A1, the system in the Vorstrasse rolled slabs of two slabs between the roughing and finishing lines at the head and The foot is welded using a heating and pressing device. The seam between the two pre-strips is then mechanically processed before the opening strip runs into the finishing train. Then it becomes endless in the finishing train rolled, while the rough road works discontinuously. Disadvantages are those with one Problems related to process stability and hot strip quality in the seam Area of the rolled piece of the seam. A ferritic or mixed Austenitic-ferritic rolling is only possible with the structural transformation in the Finished line possible with the disadvantages already mentioned.
Bei Dünnbrammen muß zwischen Walzanlagen unterschieden werden, die Dünnbrammen mit einer Dicke von 40 bis 65 mm oder größer als 65 mm als Ausgangsmaterial verwenden.In the case of thin slabs, a distinction must be made between rolling mills Thin slabs with a thickness of 40 to 65 mm or greater than 65 mm as Use raw material.
Erstere bestehen aus einer mehrgerüstigen Fertigstrasse, einem Auslaufrollgang mit Einrichtungen zum Kühlen des Warmbandes auf Wickeltemperatur und Wickelmaschinen zum Aufwickeln des Warmbandes.The former consist of a multi-stand finishing train with an outfeed roller table Devices for cooling the hot strip to winding temperature and Winding machines for winding up the hot strip.
Die Anlagen für Dünnbrammen > 65 mm bestehen aufgrund der bei gleicher Enddicke notwendigen größeren Verformungsarbeit aus einer ein- oder mehrgerüstigen Vorstrasse mit mehr als einem Walzstich und einer mehrgerüstigen Fertigstrasse sowie einem Auslaufrollgang mit Einrichtungen zum Kühlen des Warmbandes auf Wickeltemperatur und Wickelmaschinen zum Aufwickeln des Warmbandes. Zwischen Vor- und Fertigstrasse befinden sich Einrichtungen zum Erwärmen und/oder Wickeln des Vorbandes, die die notwendige Eintrittstemperatur des Warmbandes in die Fertigstrasse über die Warmbandlänge gewährleisten.The plants for thin slabs> 65 mm exist due to the same final thickness necessary larger deformation work from a single or multi-stand Vorstrasse with more than one roll pass and a multi-stand finishing train as well as an outfeed roller table with facilities for cooling the hot strip Winding temperature and winding machines for winding the hot strip. Between There are facilities for heating and / or winding in the front and finishing lines of the preliminary strip, which is the necessary entry temperature of the hot strip into the Ensure the finishing train over the length of the hot strip.
Die Walzanlagen werden im allgemeinen so ausgelegt und betrieben, daß die Umformung in den einzelnen Stichen voll austenitisch oder auch gemischt austenitisch-ferritisch erfolgt.The rolling mills are generally designed and operated so that the Forming in the individual stitches fully austenitic or mixed austenitic-ferritic.
Beim austenitischen Walzen liegt die Walztemperatur in allen Stichen oberhalb der GOS-Linie des Eisen-Kohlenstoff-Diagramms, wobei die Endwalztemperatur in den letzten Gerüsten der Fertigstrasse zur Erzielung eines feinkörnigen Gefüges nahe oberhalb der GOS-Linie liegen sollte.In austenitic rolling, the rolling temperature is above that in all passes GOS line of the iron-carbon diagram, with the finish rolling temperature in the last scaffolding of the finishing train to achieve a fine-grained structure should be above the GOS line.
Beim gemischt austenitisch-ferritischen Walzen von Stählen mit einem Kohlenstoffgehalt größer als 0,015 % liegt die Walztemperatur in den letzten Gerüsten der Fertigstrasse unterhalb der GOS-Linie im Bereich von ca. 810 bis 890 °C. Dies kann bei gleicher Enddicke erreicht werden durch Absenken der Ofenaustrittstemperatur der Brammen erreicht werden, wodurch sich der Anteil der in Lösung befindlichen Mikrolegierungselemente verringert und die Qualität des Warmbandes herabsetzt. Es ist auch ein Absenken der Walzgeschwindigkeit ohne ein Absenken der Ofenaustrittstemperatur der Brammen möglich, wodurch eine stärkere Abkühlung des Walzgutes erfolgt. Das führt aber zum Nachteil einer verringerten Produktion. Möglich ist auch die Kombination beider Maßnahmen mit den bereits genannten Nachteilen.When mixed austenitic-ferritic rolling of steels with one Carbon content greater than 0.015%, the rolling temperature is in the last Scaffolding of the finishing train below the GOS line in the range from approx. 810 to 890 ° C. This can be achieved with the same final thickness by lowering the Furnace outlet temperature of the slabs can be reached, which increases the proportion of in Solution micro-alloy elements is reduced and the quality of the Hot strip lowers. There is also a reduction in the rolling speed without a lowering of the furnace outlet temperature of the slabs is possible, whereby a the rolling stock is cooled more intensely. But that leads to the disadvantage of one reduced production. It is also possible to combine both measures with the disadvantages already mentioned.
Beim ferritischen Walzen erfolgt das Absenken der Endwalztemperatur auf minimal 720 °C durch die bereits beim gemischt austenitisch-ferritischen Walzen genannten Maßnahmen einschließlich ihrer Nachteile. Das ferritische Gebiet wird erst in den letzten zwei bis drei Walzstichen erreicht, wodurch die Abnahme in diesem Gebiet gering ist. Der Umwandlungspunkt liegt (mitten) innerhalb der Fertigstrasse und verschiebt sich durch Temperatureinflüsse zwischen den Gerüsten, was zu Walzkrafteinbrüchen infolge des niedrigeren Umformwiderstandes des Material im ferritischen Temperaturbereich führt. Dies ist von Nachteil für die Walzenbiege- und Walzenanstellsysteme zur Gewährleistung von Dicke, Profil und Kontur sowie Planheit des Warmbandes, da diese Systeme die gemessene Walzkraft als Ausgangssignal verwenden.With ferritic rolling, the final rolling temperature is reduced to a minimum 720 ° C through those already mentioned for mixed austenitic-ferritic rolling Measures including their disadvantages. The ferritic area is only in the Last two to three passes were achieved, causing the decrease in this area is low. The conversion point lies (in the middle) within the finishing street and shifts as a result of temperature influences between the scaffolds Rolling force drops due to the lower deformation resistance of the material in the leads ferritic temperature range. This is disadvantageous for the roll bending and Roller adjustment systems to ensure thickness, profile and contour as well Flatness of the hot strip, as these systems measure the rolling force as Use output signal.
In DE 196 00 990 A1 wird vorgeschlagen, das Warmband zwischen den Gerüsten der Fertigstrasse mit einer Abkühlgeschwindigkeit von mehr als 30 °K/s zur Ferritumwandlung zu kühlen. Da die Gefügeumwandlung und der Temperaturausgleich zwischen Kern- und Oberfläche Zeit benötigen, ist eine Ausgleichsstrecke von einigen Metern nach der Kühlstrecke bis zum nächsten Gerust erforderlich. Das ist jedoch nachteilig für das austenitische Walzen mit einer Endwalztemperatur größer als 890 °C; denn eine Vergrößerung der Gerüstabstände erhöht die Temperaturverluste des Warmbandes.DE 196 00 990 A1 proposes the hot strip between the stands of the Finishing line with a cooling rate of more than 30 ° K / s to Cool ferrite transformation. Since the structural transformation and the Temperature equilibrium between the core and surface takes time Compensating section from a few meters after the cooling section to the next scaffold required. However, this is disadvantageous for austenitic rolling with a Finish rolling temperature greater than 890 ° C; because an increase in the spacing between the scaffolding increases the temperature losses of the hot strip.
In der EP 0 761 325 A1 wird hinter einer mehrgerüstigen Walzstrasse mit Auslaufrollgang, Einrichtungen zum Kühlen des Warmbandes und nachgeordneten Wickelmaschinen zum Aufwickeln des austenitisch gewalzten Warmbandes eine zweite nachgeordnete ein- oder mehrgerüstige Walzstrasse für das ferritische Walzen von Warmband vorgeschlagen. Das in der ersten mehrgerüstigen Walzstrasse zunächst austentitisch verformte Warmband wird mit Hilfe der zwischen den beiden Walzstrassen angeordneten Einrichtungen zum Kühlen in den ferritischen Temperaturbereich gekühlt. Die nachgeordnete ein- oder mehrgerüstige Walzstrasse dient ausschließlich zum ferritischen Walzen, wodurch praktisch zwei Walzstrassen erforderlich sind, was einen hohen anlagentechnischen Aufwand darstellt.In EP 0 761 325 A1 is behind a multi-stand rolling mill Outfeed roller table, facilities for cooling the hot strip and downstream Winding machines for winding up the austenitic rolled hot strip second downstream single or multi-stand rolling mill for ferritic rolling proposed by hot strip. That in the first multi-stand rolling mill The hot strip is initially austentitically deformed with the help of the between the two Mills arranged devices for cooling in the ferritic Cooled temperature range. The downstream single or multi-stand rolling mill is used exclusively for ferritic rolling, which practically means two rolling trains are required, which represents a high investment in plant technology.
In EP 0 761 326 A1 wird eine Produktionsanlage vorgeschlagen, bestehend aus einer mehrgerüstigen Walzstrasse, einem Auslaufrollgang mit Einrichtungen zum Kühlen des Warmbandes und nachgeordneten Wickelmaschinen, bei der mindestens das erste Gerüst als Reversiergerüst ausgebildet ist, dem mindestens je ein Haspelofen vor- und nachgeordnet sind, wobei zwischen dem vorgesetzten Haspelofen und dem folgenden Reversiergerüst eine steuerbare Kühleinrichtung vorgesehen ist. Nach dem Walzen des Warmbandes im austenitischen Temperaturgebiet wird das Warmband mittels der steuerbaren Kühleinrichtung in das ferritische Temperaturgebiet gekühlt und im Haspelofen aufgewickelt. Die Gefügeumwandlung findet im Haspelofen statt. Anschließend wird reversierend durch die dem Haspelofen nachgeordnete Walzstrasse im ferritischen Temperaturgebiet gewalzt. Beim austenitischen Walzen wird nicht gekühlt. Das Warmband kann mittels einer Heizvorrichtung zwischen den Walzstrassen erwärmt werden. Verschiedene Anordnungen von Gerüsten und Haspelöfen werden vorgeschlagen. Kennzeichnend ist in jedem Fall der Reversierbetrieb, wodurch die vorgeschlagene Produktionsanlage nicht endlos kontinuierlich walzen kann. Der oder die zusätzlich notwendigen Haspelöfen erhöhen den anlagentechnischen Aufwand.EP 0 761 326 A1 proposes a production plant consisting of a multi-stand rolling mill, an outfeed roller table with facilities for cooling of the hot strip and downstream winding machines, in which at least that the first scaffold is designed as a reversing scaffold with at least one coiler are upstream and downstream, between the upstream reel furnace and the following reversing frame a controllable cooling device is provided. After this Rolling the hot strip in the austenitic temperature range becomes the hot strip cooled in the ferritic temperature region by means of the controllable cooling device and wound up in the reel furnace. The structural transformation takes place in the reel furnace. Then it is reversed by the one downstream of the coiler Rolled mill in the ferritic temperature range. Austenitic rolling is not cooled. The hot strip can be between the Rolling mills are heated. Different arrangements of scaffolding and Coiler furnaces are proposed. The characteristic is in any case Reverse operation, making the proposed production facility not endless can roll continuously. Increase the additional reel furnace (s) required the plant engineering effort.
Bekannt sind auch Produktionsanlagen für das Walzen von Warmband aus Dünnbrammen, bei denen einer ein- oder mehrgerüstigen Vorstrasse Einrichtungen zum Kühlen und Heizen nachgeordnet sind. Diesen Einrichtungen sind eine mehrgerüstige Fertigstrasse mit einem Auslaufrollgang, Einrichtungen zum Kühlen und Wickelmaschinen zum Aufwickeln des Warmbandes nachgeordnet. Generell erfolgen in der Vorstrasse mindestens zwei Walzstiche im austenitischen Temperaturbereich, entweder in mehreren Gerüsten im kontinuierlichen Betrieb oder in einem einzelnen Gerüst im Reversierbetrieb. Beim ferritischen oder gemischt austenitisch-ferritischen Walzen wird das Warmband in den Einrichtungen zum Kühlen zwischen Vor- und Fertigstrasse auf die Temperatur des jeweiligen Temperaturgebietes gekühlt und anschließend in der Fertigstrasse ferritisch oder gemischt austenitisch-ferritisch fertiggewalzt. Beim austenitischen Walzen wird das Warmband in Einrichtungen zum Heizen zwischen Vor- und Fertigstrasse zwischengewärmt oder auf gleicher Temperatur gehalten, um auch austenitisch in der Fertigstrasse fertiggewalzt werden zu können. Gewalzt werden einzelne Dünnbrammen oder eine zu einer langen Dünnbramme abgegossenen Schmelze, wobei das Gewicht der langen Dünnbramme ein Vielfaches einer einzelnen Dünnbramme entspricht, d.h. in beiden Fällen kommt es zu einer Unterbrechung des Walzprozesses.Production plants for rolling hot strip are also known Thin slabs in which a single or multi-stand rough road facilities for cooling and heating are subordinate. These facilities are one Multi-stand finishing train with an outfeed roller table, facilities for cooling and winding machines for winding the hot strip downstream. As a general rule At least two roll passes are made in austenitic in the Vorstrasse Temperature range, either in multiple stands in continuous operation or in a single stand in reverse operation. For ferritic or mixed austenitic-ferritic rolls, the hot strip is used in the facilities Cooling between the roughing and finishing lines to the temperature of the respective one Temperature range cooled and then ferritic or in the finishing train mixed austenitic-ferritic finish-rolled. In the case of austenitic rolling, this becomes Hot strip in heating facilities between roughing and finishing lines reheated or kept at the same temperature in order to also be austenitic in the Finished mill can be finished rolled. Individuals are rolled Thin slabs or a melt cast into a long thin slab, where the weight of the long thin slab is a multiple of a single Corresponds to thin slab, i.e. in both cases the Rolling process.
Allen bekannten oder vorgeschlagenen Produktionsanlagen ist der Durchlauf des Ausgangsmaterials durch einen Ofen oder eine induktive Erwärmungsanlage zum Zweck der Erwärmung oder des Temperaturausgleiches über Dicke und Breite oder der Homogenisierung des Ausgangsmaterials vor dem Walzen gemeinsam.All known or proposed production systems is the run of the Starting material through a furnace or an inductive heating system for Purpose of heating or temperature compensation across thickness and width or the homogenization of the starting material before rolling together.
Die bekannten Produktionsanlagen benötigen Einrichtungen zum Entzundern des Ausgangsmaterials vor dem ersten Stich und vor der Fertigstrasse. Die Notwendigkeit des Entzunderns des Ausgangsmaterials vor dem ersten Stich ergibt sich aufgrund der Verzunderung der Oberfläche des Ausgangsmaterials während dessen Durchlaufs durch einen Anwärm-, Ausgleich- oder Homogenisierungsofen oder einer induktiven Erwärmungsanlage. Die Notwendigkeit des Entzunderns vor der Fertigstrasse ergibt sich aufgrund der Sekundärverzunderung des Warmbandes im Bereich der Vorstrasse und zwischen Vor- und Fertigstrasse.The known production plants need facilities for descaling the Starting material before the first stitch and before the finishing train. The need the descaling of the starting material before the first stitch results from the scaling of the surface of the starting material during this Pass through a heating, equalizing or homogenizing furnace or one inductive heating system. The need for descaling before The finishing mill results from the secondary scaling of the hot strip in the Area of the Vorstrasse and between the Vorstrasse and Fertigstrasse.
Der Produktionsprozeß bei den bekannten oder vorgeschlagenen Produktionsanlagen ist diskontinuierlich bzw. im Falles des Verschweißens von Warmband nach der Vorstraße nur in der Fertigstraße endlos kontinuierlich.The production process in the known or proposed production facilities is discontinuous or in the case of welding hot strip after Vorstraße only continuously in the finishing train.
Allen bekannten oder vorgeschlagenen Produktionsanlagen sind aufgrund der Diskontinuität des Prozesses nachteilige Belastungsstöße während der Anstiche des Ausgangsmaterials in die Gerüste der Vor- bzw. Fertigstraße und während des Anstiches des in der Vorstraße gewalzten Warmbandes in die Fertigstraße sowie während des Einlaufs des fertig gewalzten Warmbandes in die Wickelmaschinen gemeinsam, wodurch der Verschleiß der Anlagenteile erhöht und deren Lebensdauer herabgesetzt wird.All known or proposed production facilities are due to the Discontinuity in the process of adverse load shocks during the piercing of the Starting material in the scaffolding of the roughing or finishing train and during the Tapping the hot strip rolled in the roughing mill into the finishing mill as well while the finished hot strip is being fed into the winding machine together, which increases the wear of the system parts and their service life is reduced.
Eine Walzspaltschmierung kann in den Gerüsten der Vor- und Fertigstrasse bekannter Produktionsanlagen erst nach dem Anstich des Ausgangsmaterials bzw. des Warmbandes im jeweiligen Gerüst eingesetzt werden, da sonst die Greifbedingung nicht gewährleistet ist. Die mit der Walzspaltschmierung verbundene Reduzierung.der Reibung zwischen Walzgut und Walze führt zu einer Senkung des Umformwiderstandes und dadurch der Walzkraft, des Walzmomentes sowie der erforderlichen Antriebsleistung. Die Oberflächenqualität des Warmbandes wird erhöht. Diese Vorteile ergeben sich jedoch nicht für das Anstichstück des Warmbandes, das nach dem Auswalzen einen beträchtlichen Teil der Länge des Warmbandes ausmacht. Zudem müssen die Produktionanlagen für den Belastungszustand ohne Walzspaltschmierung ausgelegt werden.Roll gap lubrication can be carried out in the scaffolding of the roughing and finishing train known production plants only after tapping the raw material or of the hot strip in the respective scaffolding, otherwise the Gripping condition is not guaranteed. The associated with the roll gap lubrication Reduction. The friction between the rolling stock and the roll leads to a reduction in the Resistance to deformation and thereby the rolling force, the rolling moment and the required drive power. The surface quality of the hot strip is elevated. However, these advantages do not arise for the tapping piece of the Hot strip, which after rolling out a considerable part of the length of the Makes up hot strip. In addition, the production facilities for the Load condition can be designed without roll gap lubrication.
Schließlich sind allen bekannten oder vorgeschlagenen Produktionsanlagen aufgrund der Diskontinuität des Prozesses nachteilige Qualitätseinschränkungen über die Länge des gewalzten Warmbandes gemeinsam, da die Produktionsanlagen nach jedem Anstich einer Bramme, Dünnbramme oder des Warmbandes neu ausgeregelt werden müssen.Finally, all known or proposed production facilities are due the discontinuity of the process adversely affects the quality Length of the rolled hot strip common, since the production facilities according to adjusted every time a slab, thin slab or hot strip is tapped Need to become.
Bei diesem Stand der Technik besteht die Aufgabe der Erfindungen darin, eine Produktionsanlage für das austenitische, das gemischt austenitisch-ferritische und das ferritische Walzen von dünnem Warmband in einem endlos vollkontinuierlichem Prozeß zu schaffen, mit der die zuvor genannten Nachteile und Probleme beseitigt werden und auf der alle drei zuvor genannten Technologien realisiert werden könnenIn this prior art, the object of the invention is to: Production plant for the austenitic, the mixed austenitic-ferritic and the ferritic rolling of thin hot strip in an endlessly fully continuous To create a process that eliminates the aforementioned drawbacks and problems and on which all three previously mentioned technologies can be realized
Die Lösung der Aufgabe gelingt mit einer Produktionsanlage der eingangs genannten Art erfindungsgemäß dadurch, dass das in einer Dicke von 5 - 18 mm gegossene Band vor Erreichen der eingerüstigen Vorstrasse unter Schutzgasatmosphäre gesteuert gekühlt und das vorgewalzte Warmband in einer der Vorstrasse nachgeordneten Einrichtung wahlweise gesteuert gekühlt, erwärmt oder auf Temperatur gehalten wird sowie die Kanten des Warmbandes nachgewärmt werden. The task is solved with a production plant of the type mentioned at the beginning Art according to the invention in that the cast in a thickness of 5 - 18 mm Belt before reaching the single-deck forecourt under a protective gas atmosphere controlled cooled and the pre-rolled hot strip in one of the rough streets downstream device either controlled cooled, heated or on Temperature is maintained and the edges of the hot strip are reheated.
Das Produktionsverfahren ist speziell für das Walzen von dünnem Giessband nach allen drei möglichen Technologien, d.h. dem austenitischen, dem austenitisch-ferritischen und dem ferritischen Walzen gestaltet. Aus dem dünnem Giessband kann endlos und vollkontinuierlich Bandmaterial mit kleinen Dicken sowohl austenitisch und ferritisch als auch gemischt austenitisch-ferritisch mit einer Gesamtabnahme von mindestens 65% bezogen auf die Gesamtanlage hergestellt werden.The production process is specially designed for rolling thin cast strip all three possible technologies, i.e. the austenitic, the austenitic-ferritic and the ferritic rolling. Can from the thin casting belt endless and fully continuous strip material with small thicknesses both austenitic and ferritic as well as mixed austenitic-ferritic with a total decrease of at least 65% based on the overall system.
Erforderlich sind lediglich je nach dem Duo-, Quarto- oder Sextogerüste mit Arbeitswalzendurchmessern von 300 bis 900 mm sowie die bei Warm- und Kaltwalzprozessen üblichen Stellglieder und Regelkreise zur gezielten Temperaturführung und zur Gewährleistung der geforderten Fertigprodukttoleranzen für Dicke, Profil, Planheit und werkstofftechnische sowie mechanische Eigenschaften.All that is required is depending on the duo, quarto or sex scaffolding Work roll diameters from 300 to 900 mm as well as those for hot and Cold rolling processes usual actuators and control loops for targeted Temperature control and to ensure the required finished product tolerances for thickness, profile, flatness and material and mechanical properties.
Erfindungsgemäß wird die im Austenitgebiet liegende Walztemperatur in der eingerüstigen Vorstrasse durch variabel gesteuertes Kühlen des Giessbandes vor der Vorstraße eingestellt. Mit der gezielten Kühlung des durcherstarrten Gießbandes der Dicke 5 bis 18 mm unter regelbarer Schutzgasatmosphäre werden die technologisch erforderlichen Kenngrößen Temperatur, Austenitstartkorngröße, der Grad der Verzunderung und die chemische Zusammensetzung des Zunders vor dem ersten Walzstich eingestellt.According to the invention, the rolling temperature in the austenite region is in the single-stand forecourt by variably controlled cooling of the casting belt in front of the Vorstrasse set. With the targeted cooling of the solidified casting belt of the The thickness is 5 to 18 mm under an adjustable protective gas atmosphere required parameters temperature, austenite starting grain size, the degree of Scale and chemical composition of the scale before the first Roll stitch set.
Vorzugsweise ist vorgesehen, daß Kohlenstoffstähle, niedrig legierte Stähle, niedrig gekohlte Stähle und mikrolegierte Stähle durch eine werkstoffabhängige Abnahme von 45 bis 70 % in der eingerüstigen Vorstrasse im Zusammenhang mit der im austenitischen Bereich variabel einstellbaren Walztemperatur und dem sich an die Umformung anschließenden Kühlen, Heizen oder Halten der Temperatur bis zum Eintritt in die mehrgerüstige Fertigstrasse rekristallisieren und die Ausgangskorngroße des Giessbandes mit nur einem Stich stark verkleinert, mindestens jedoch halbiert wird.It is preferably provided that carbon steels, low-alloy steels, are low Carbonized steels and microalloyed steels through a material-dependent acceptance from 45 to 70% in the single-armed Vorstrasse in connection with the in austenitic range of variably adjustable rolling temperature and which adapts to the Forming subsequent cooling, heating or maintaining the temperature until Recrystallize entry into the multi-stand finishing train and the initial grain size of the casting belt with one stitch greatly reduced, but at least halved becomes.
In einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß die Walztemperatur vor der mehrgerüstigen Fertigstrasse durch die hinter der Vorstrasse angeordnete Einrichtung zum steuerbaren Kühlen, Heizen oder Halten der Temperatur des Warmbandes wahlweise im Austenit- oder im Ferritbereich oder im Übergangsbereich von Austenit zu Ferrit gezielt einstellbar ist.In a further embodiment of the invention it is provided that the Rolling temperature before the multi-stand finishing train through the behind the roughing train arranged device for controllable cooling, heating or holding the Hot strip temperature optionally in the austenite or ferrite area or in the Transition range from austenite to ferrite is selectively adjustable.
Durch eine werkstoffabhängige Gesamtabnahme von größer 50 % in der mehrgerüstigen Fertigstrasse im Zusammenhang mit der gezielt einstellbaren Walztemperatur in dem Warmband wird erfindungsgemäß ein feinkörniges Gefüge der Korngrößenklassen 6 - 10 gemäß DIN 50601 erzeugt.Through a material-dependent total decrease of more than 50% in the Multi-stand finishing train in connection with the selectively adjustable According to the invention, the rolling temperature in the hot strip becomes a fine-grained structure grain size classes 6 - 10 according to DIN 50601.
Durch die mittels Kühlung variabel einstellbare Walztemperatur, die werkstoffabhängige hohe Abnahme von 45 - 70% in der eingerüstigen Vorstrasse und das variabel steuerbare Kühlen, Heizen oder Halten der Temperatur des Warmbandes ist das Warmband vor dessen Eintritt in die Fertigstrasse rekristallisiert und die Ausgangskorngröße des Gießbandes stark reduziert.Due to the rolling temperature, which is variably adjustable by means of cooling, the material-dependent high decrease of 45 - 70% in the one-stand forelevel and the variably controllable cooling, heating or maintaining the temperature of the Hot strip is the recrystallized hot strip before it enters the finishing train and greatly reduced the starting grain size of the casting belt.
Des weiteren ist vorgesehen, daß das ferritisch endlos und das gemischt austenitisch-ferritisch endlos vollkontinuierlich gewalzte Warmband unmittelbar nach dem Austritt aus dem letzten Gerüst der mehrgerüstigen Fertigstrasse in wärmeisolierten Wickelmaschinen zum Bund aufgewickelt und einer über die Bundbreite homogenen langsamen Abkühlung unterworfen wird.It is also provided that the ferritic is endless and the mixed austenitic-ferritic endless continuously rolled hot strip immediately after the exit from the last scaffolding of the multi-stand finishing train in heat-insulated Winding machines wound into a bundle and one homogeneous across the bundle width is subjected to slow cooling.
Es hat sich als günstig herausgestellt, das austenitisch endlos vollkontinuierlich gewalzte Warmband nach Austritt aus dem letzten Gerüst der mehrgerüstigen Fertigstrasse zunächst von oben zwangszukühlen und das Warmband danach bei gezielter Gefügeumwandlung auf Wickeltemperatur zu kühlen.It turned out to be cheap, the austenitic endless fully continuous rolled hot strip after emerging from the last stand of the multi-stand First, force-cool the finishing train from above and then add the hot strip targeted structural transformation to cool to winding temperature.
Da erfindungsgemäß das dünne Giessband mit einem Anfahrstück versehen ist, wird vorgeschlagen, dass das Anfahrstück die geöffneten Gerüste der Vorstrasse und der mehrgerüstigen Fertigstrasse unverformt in Walzrichtung passiert und mit der Schere vom übrigen Giessband getrennt wird.Since, according to the invention, the thin casting belt is provided with a starting piece, suggested that the approach piece be the open scaffolding of the Vorstrasse and the Multi-stand finishing train passes undeformed in the rolling direction and with scissors is separated from the rest of the casting line.
Günstig ist es, wenn die geöffneten Gerüste der Vorstrasse und der mehrgerustigen Fertigstrasse nach dem Trennen des Anfahrstückes des dünnen Giessbandes mittels der Schere auf die für das Walzen der erforderlichen Enddicke vorgesehenen Walzspalte zugefahren werden, und das während des Zufahrvorganges gewalzte Stück des Warmbandes entweder mit Hilfe einer Schere gehäckselt oder mittels Wickelmaschinen aufgewickelt wird.It is beneficial if the open scaffolding of the forecourt and the multi-scaffold Finishing line after separating the approach piece of the thin casting belt by means of the shears to those intended for rolling the required final thickness Roll nips are closed, and that rolled during the closing process Piece of the hot strip either chopped with scissors or by means of Winding machines is wound up.
Zur Herabsetzung der Reibung zwischen Walzgut und Walze und dadurch zur Verminderung der Walzkräfte, Walzmomente und Antriebsleistung und zur Erhöhung der Oberflächenqualität über die gesamte Länge des gewalzten Warmbandes wird nach einem anderen Merkmal der Erfindung vorgeschlagen, die Walzen bereits während des Zufahrens der geöffneten Gerüste der eingerüstigen Vorstrasse und der mehrgerüstigen Fertigstrasse auf die für das Walzen der erforderlichen Enddicke vorgesehenen Walzspalte zu schmieren.To reduce the friction between the rolling stock and the roll and thereby Reduction of the rolling forces, rolling moments and drive power and to increase the surface quality over the entire length of the rolled hot strip proposed according to another feature of the invention, the rollers already during the closing of the open scaffolding of the single scaffold road and the multi-stand finishing train to the final thickness required for rolling to lubricate the intended nip.
Wenn erfindungsgemäß die Walzspaltschmierung während der gesamten Walzzeit erfolgt, sinkt der Verschleiß der Arbeitswalzen, wodurch Dicke und Profil über die gesamte Warmbandlänge verbessert werden und die Lebensdauer der Walzen erhöht wird.If according to the invention the roll gap lubrication during the entire rolling time takes place, the wear on the work rolls decreases, which means that the thickness and profile of the total hot strip length can be improved and the service life of the rollers is increased.
Erfindungsgemäß soll nach dem Zufahren der Walzspalte der eingerüstigen Vorstrasse und der mehrgerüstigen Fertigstrasse auf die für das Walzen der erforderlichen Enddicke vorgesehenen Werte und nach dem Häckseln des während des Zufahrvorganges gewalzten Warmbandstückes mittels der Schere der stationäre Zustand des vollkontinuierlichen Endloswalzens von dünnem Giessband erreicht sein und das austenitisch, gemischt austenitisch-ferritisch oder ferritisch gewalzte Warmband mittels der Schere in Bundlängen getrennt werden.According to the invention, after the roll gap has been closed, the single-arm Vorstrasse and the multi-stand finishing train on the for rolling the required final thickness values provided and after chopping the while of the rolling process rolled hot strip by means of scissors the stationary Condition of fully continuous endless rolling of thin casting belt has been reached and the austenitic, mixed austenitic-ferritic or ferritically rolled Hot strip can be cut into bundle lengths using scissors.
Günstig ist es, wenn zur Erhöhung der Kantenqualität und der Profilgenauigkeit des Warmbandes die Kanten des dünnen Giessbandes in einem der eingerüstigen Vorstrasse angeflanschtem Vertikalgerüst mit Spezialstauchkaliber mit geringer Abnahme vor dem Horizontalstich verformt werden und gleichzeitig das dünne Giessband mittig in die eingerüstige Vorstrasse einläuft.It is favorable if to increase the edge quality and the profile accuracy of the Hot strip the edges of the thin casting belt in one of the single-skinned A vertical scaffold with a special compression caliber with a low flange Decrease before the horizontal stitch and deform the thin The casting belt runs into the center of the single-row forecourt.
Dadurch, dass das Ausgangsmaterials bzw. das Warmbandes aufgrund des endlos vollkontinuierlichen Produktionsprozesses nichtreversierend gewalzt wird, entfallen wiederholte Anstiche und die damit verbundenen Belastungsstöße. The fact that the starting material or the hot strip due to the endless fully continuous production process is rolled non-reversing repeated punctures and the associated shock loads.
Weil die Produktionsanlage aufgrund des endlos. vollkontinuierlichen Produktionsprozesses nach dem Anfahren einmalig ausgeregelt wird, kann eine konstant hohe Qualität des Warmbandes über dessen Länge erreicht werden.Because the production line due to the endless. fully continuous Production process is regulated once after starting up, one constant high quality of the hot strip can be achieved over its length.
Schließlich sieht die Erfindung vor, daß der Grad der Verzunderung auf der Oberfläche des Ausgangsmaterials und die chemische Zusammensetzung des Zunders durch das regelbare Kühlen des Gießbandes unter Schutzgasatmosphäre gezielt bis zum ersten Walzstich eingestellt wird.Finally, the invention provides that the degree of scaling on the Surface of the raw material and the chemical composition of the Tinder by controllable cooling of the casting belt under a protective gas atmosphere is specifically set until the first roll pass.
Mit der Erfindung ergibt sich ein Gesamtanlagenkonzept, mit dem in optimaler Weise ein vollkontinuierlicher Endloswalzprozeß realisiert werden kann, der alle drei möglichen Walztechnologien für die Herstellung von Warmband, d.h. das austenitische, das gemischt austenitisch-ferritische und das ferritische Walzen zuläßt.The invention results in an overall system concept with which in an optimal manner a fully continuous endless rolling process can be realized, all three possible rolling technologies for the production of hot strip, i.e. the austenitic, which allows mixed austenitic-ferritic and ferritic rolling.
Eine Produktionsanlage, mit der aus dünnem Giessband endlos und vollkontinuierlich
Bandmaterial mit kleinen Dicken sowohl austenitisch und ferritisch als auch gemischt
austenitisch-ferritisch mit einer Gesamtabnahme von mindestens 65% bezogen auf
die Gesamtanlage hergestellt werden kann, ist in der einzigen Zeichnungsfigur
dargestellt und wird nachfolgend beschrieben. Sie besteht aus einer
Dünnbrammengießanlage 12, einer ersten Einrichtung 2 zum Kühlen des Gießbandes
unter Schutzgas, einer eingerüstigen Vorstrasse 3, einer mehrgerüstigen Fertigstraße
5, einer zweiten Einrichtung 4 zum wahlweise Kühlen, Heizen oder Halten der
Temperatur des Warmbandes zwischen Vor- und Fertigstrasse, einer Schere 6 zum
Trennen des Warmbandes von Bund zu Bund, einem Auslaufrollgang mit
Einrichtungen 8 zum Kühlen des gewalzten Warmbandes und einer der Fertigstrasse
5 nachgeordneten Wickelmaschinen 10 zum Aufwickeln des FertigbandesA production system with which continuous and continuous casting of thin casting tape
Strip material with small thicknesses both austenitic and ferritic as well as mixed
austenitic-ferritic with a total decrease of at least 65% based on
the entire system can be manufactured is in the single drawing figure
shown and will be described below. It consists of one
Der Ablauf des Walzprozesses beginnt mit der gezielten Kühlung des durcherstarrten Gießbandes der Dicke 5 bis 18 mm unter regelbarer Schutzgasatmosphäre, wodurch die technologisch erforderlichen Kenngrößen Temperatur, Austenitstartkorngröße der Grad der Verzunderung und die chemische Zusammensetzung des Zunders vor dem ersten Walzstich eingestellt werden können The rolling process begins with the targeted cooling of the solidified Casting belt with a thickness of 5 to 18 mm under an adjustable protective gas atmosphere, whereby the technologically required parameters temperature, austenite starting grain size Degree of scaling and the chemical composition of the scale before first roll pass can be set
Das Anfahrstück des dünnen Gießbandes durchläuft unverformt die geöffneten
Gerüste der eingerüstigen Vorstrasse 3 und der mehrgerüstigen Fertigstrasse 5 in
Walzrichtung 11 und wird mit der der Fertigstrasse nachgeordneten Schere 6 vom
übrigen Gießband mit einem oder mehreren Schnitten getrennt. Danach werden die
geöffneten Gerüste der eingerüstigen Vorstrasse 3 und der mehrgerüstigen
Fertigstrasse 5 auf die für das Walzen der erforderlichen Enddicke vorgesehenen
Walzspalte zugefahren und das während des Zufahrvorganges gewalzte Stück des
Warmbandes mit Hilfe der Schere 6 gehäckselt oder mittels Wickelmaschinen 7 oder
10 mit aufgewickelt.The approach piece of the thin casting belt passes through the open undeformed
Scaffolding of the single-
Eine Walzspaltschmierung kann bereits während des Zufahrens der Gerüste auf die für das Walzen der erforderlichen Enddicke vorgesehenen Walzspalte eingesetzt werden, da die Greifbedingung infolge der stetig bis zur Walzspaltendstellung ansteigenden Abnahme gewährleistet ist.A roller gap lubrication can be applied to the stands while the stands are still being closed Roll gaps provided for rolling the required final thickness as the gripping condition is due to the continuous up to the nip position increasing decrease is guaranteed.
Das Ausgangsmaterial wird endlos in der eingerüstigen Vorstrasse 3 mit einer
werkstoffabhängigen Abnahme von 45 bis 70% für Kohlenstoffstähle, niedrig legierte
Stähle, niedrig gekohlte und mikrolegierte Stähle in einem Horizontalstich im
austenitischen Temperaturgebiet gewalzt.The source material is endless in the single-
Die Kanten des Gießbandes werden vor dem Horizontalstich in einem vor der
eingerüstigen Vorstraße 3 angeflanschtem Vertikalgerüst mittels Spezialstauchkaliber
gering verformt, wodurch das Gießband gleichzeitig mittig in die eingerüstige
Vorstrasse einläuft.The edges of the casting belt are in front of the horizontal stitch in a
single-
Nach der Vorstrasse durchläuft das Warmband eine Einrichtung 4 zum steuerbaren
Kühlen, Heizen oder Halten der Temperatur, wodurch die Temperatur des
Warmbandes vor Eintritt in die mehrgerüstige Fertigstrasse 5 gezielt im Austenit- oder
im Ferritbereich oder im Übergangsbereich vom Austenit zu Ferrit einstellbar istAfter the Vorstrasse the hot strip passes through a
Durch die mittels Kühleinrichtung 2 variabel einstellbare Walztemperatur, die
werkstoffabhängige hohe Abnahme von 45 - 70% in der eingerüstigen Vorstrasse 3
und die mittels Einrichtung 4 zum steuerbaren Kühlen, Heizen oder Halten der
Temperatur variabel einstellbare Temperatur des Warmbandes ist das Warmband vor
dessen Eintritt in die Fertigstrasse rekristallisiert und die Ausgangskorngröße des
Gießbandes stark reduziert.Due to the variably adjustable rolling temperature by means of the
In der mehrgerüstigen Fertigstrasse wird das Warmband mit einer werkstoffabhängigen Gesamtabnahme von größer 50% zu dünnem Warmband gewalzt, wodurch im Zusammenhang mit der gezielt einstellbaren Walztemperatur ein feinkörniges Gefüge nach dem Walzen vorliegt.In the multi-stand finishing train, the hot strip is processed with a total material-dependent decrease of more than 50% to thin hot strip rolled, which in connection with the specifically adjustable rolling temperature fine-grained structure after rolling.
Das ferritisch und das gemischt austenitisch-ferritisch endlos vollkontinuierlich
gewalzte Warmband wird unmittelbar nach der Fertigstrasse in wärmeisolierten
Wickelmaschinen 7 zum Bund aufgewickelt.The ferritic and the mixed austenitic-ferritic endless fully continuous
Rolled hot strip is insulated immediately after the finishing
Das austenitisch, endlos vollkontinuierlich gewalzte Warmband durchläuft nach
Austritt aus der Fertigstrasse 5 zunächst eine Kühlstrecke 8 mit Zwangskühlung von
oben und danach eine Einrichtung zum Kühlen des Warmbandes auf
Wickeltemperatur mit gezielter Gefügeumwandlung.The austenitic, endless, fully continuously rolled hot strip runs through
Leaving the finishing
Die Produktionsanlage wird nach dem Anfahren einmalig ausgeregelt, wonach eine konstant hohe Qualität des Warmbandes über dessen Länge im endlos vollkontinuierlichen Prozeß erzielt wird. The production system is adjusted once after starting up, after which one constant high quality of the hot strip over its length in the endless fully continuous process is achieved.
- 11
- Produktionsanlage zum Walzen von dünnem GiessbandProduction line for rolling thin casting strip
- 22
- Einrichtung zum Kühlen des GiessbandesDevice for cooling the casting belt
- 33
- eingerüstige Vorstrasse mit angeflanschtem Vertikalgerüstsingle-scored forecourt with flanged vertical scaffold
- 44
- Einrichtung zum Kühlen, Heizen oder Halten der Temperatur des WarmbandesDevice for cooling, heating or maintaining the temperature of the hot strip
- 55
- mehrgerüstige Fertigstrassemulti-stand finishing train
- 66
- Scherescissors
- 77
- wärmeisolierte Wickelmaschinethermally insulated winding machine
- 88th
- ZwangskühlstreckeForced cooling section
- 99
- Einrichtung zum Kühlen des WarmbandesDevice for cooling the hot strip
- 1010
- Wickelmaschinewinder
- 1111
- Walzrichtungrolling direction
- 1212
- Dünnbandgiessanlagethin strip casting
Claims (17)
- Production method for the continuous production of hot-rolled flat products made from thinly cast strip on an installation comprising a single-stand blooming train (3), a multi-stand finishing train (5), a run-out roller table with devices (8, 9) for cooling the hot strip and pre- and post-arranged coiling machines (7, 10) for coiling up the hot strip,
characterised in that
the strip which is cast in a thickness of 5 - 18 mm is cooled in a controlled manner in a protective gas atmosphere prior to reaching the single-stand blooming train (3) and the rough-rolled hot strip is cooled, heated or maintained at temperature as desired in a controlled manner in a device (4) which is arranged after the blooming train (3) and the edges of the hot strip are reheated. - Production method according to claim 1,
characterised in that
the roller temperature which lies in the austenitic region is adjusted in the single-stand blooming train (3) by means of variably controlled cooling of the cast strip prior to the blooming train (3). - Production method according to claim 1 and claim 2,
characterised in that
carbon steels, low alloy steels, low carbon steels and micro-alloyed steels re-crystallise by means of a material-dependent decrease of 45 to 70% in the single-stand blooming train (3) in conjunction with the roller temperature, which is variably adjustable in the austenitic range, and with the cooling, heating or maintaining of the temperature (4) subsequent to conversion up to entry into the multi-stand finishing train (5) and the initial grain size of the cast strip is severely reduced, in only one roll pass, but at least halved. - Production method according to claim 1 and claim 2,
characterised in that
the roller temperature is adjustable in a specific manner prior to the multi-stand finishing train (5) by means of the device (4), which is disposed behind the blooming train (3), for controllable cooling, heating or maintaining of the temperature of the hot strip as desired in the austenite or in the ferrite range or in the transition range from austenite to ferrite. - Production method according to claim 1 to 4,
characterised in that
a fine-grained texture of the grain size classes 6 - 10 according to DIN 50601 is produced in the hot strip by means of a material-dependent total decrease of greater than 50% in the multi-stand finishing train (5) in conjunction with the roller temperature which is adjustable in a specific manner. - Production method according to claim 1 to 5,
characterised in that
the ferritically endlessly and the mixed austenitically-ferritically endlessly, fully continuously rolled hot strip is coiled up into a coil in heat-insulated coiling machines (7) immediately after exiting from the last stand of the multi-stand finishing train (5) and is subject to a homogenously slow cooling over the coil width. - Production method according to claim 1 to 5,
characterised in that
the austenitically endlessly fully continuously rolled hot strip is first forcibly cooled (8) from above after exiting from the last stand of the multi-stand finishing train (5) and the hot strip is thereafter cooled (9) to coiling temperature with a specific texture conversion. - Production method according to claim 1 to 5,
characterised in that
the thin cast strip is provided with a dummy bar, which passes unworked in the roller direction through the opened stands of the single-stand blooming train (3) and of the multi-stand finishing train (5) and is separated from the remaining cast strip by the shearing machine (6). - Production method according to claim 1 to 5 and 8,
characterised in that
the opened stands of the single-stand blooming train (3) and of the multi-stand finishing train (5) are closed after the separation of the dummy bar of the thin cast strip by means of the shearing machine (6) to the roller gap which is provided for rolling of the required end thickness and the piece of the hot strip, which is rolled during the closing process, is either chopped off by means of a shearing machine (6) or coiled up by means of coiling machines (7, 10). - Production method according to clam 1 to 9,
characterised in that,
in order to decrease the friction between rolled product and roller and consequently to reduce the roller powers, roller torques and to increase the surface quality over the entire length of the rolled hot strip, the rollers are already lubricated during closing of the opened stands of the single-stand blooming train (3) and of the multi-stand finishing train (5) to the roller gap which is provided for rolling of the required end thickness. - Production method according to claim 10,
characterised in that
the roller gap lubrication is effected during the entire rolling time. - Production method according to claim 1 to 5 and 8 to 11,
characterised in that,
after closing the roller gap of the single-stand blooming train (3) and of the multi-stand finishing train (5) to the values which are provided for rolling of the required end thickness and after chopping off the hot strip piece, which is rolled during the closing process, by the shearing machine (6), the steady-state condition of the fully continuous, endless rolling of thin strip is achieved and the austenitically, mixed austenitically-ferritically or ferritically rolled hot strip is separated by means of the shearing machine (6) into coil lengths. - Production method according to claim 1 to 3,
characterised in that,
in order to increase the edge quality and the profile accuracy of the hot strip, the edges of the thin cast strip are deformed before the horizontal roll pass with less reduction in a vertical stand with special edging pass, which vertical stand is flanged onto the single-stand blooming train (3), and at the same time the thin cast strip feeds centrally into the single-stand blooming train (3). - Production method according to claim 1 to 3,
characterised in that
the initial material or the hot strip is non-reversibly rolled as a result of the endlessly fully continuous production process. - Production method according to claim 1 to 14,
characterised in that
the production installation is stabilised on a once-through basis after start-up as a result of the endlessly fully continuous, production process, as a result of which a constant high quality of the hot strip over its length is achieved. - Production method according to claim 1 to 15,
characterised in that
the degree of the scaling on the surface of the initial material and the chemical composition of the scale is adjusted specifically by means of the controllable cooling of the cast strip in a protective gas atmosphere up to the first roll pass. - Production installation for implementation of the method according to the invention according to one or more of the claims 1 to 16, comprising a casting machine (12) for producing the cast strip with a thickness of 5 - 18 mm, a device for cooling the cast strip in protective gas (2), a single-stand blooming train (3), a multi-stand finishing train (5), a device (4) for cooling, heating or maintaining of the temperature of the cast strip as desired between the blooming and the finishing train (3, 5), a shearing machine (6) for separating the hot strip from coil to coil, a run-out roller table with devices for cooling (8, 9) the rolled hot strip and with coiling machines (7, 10) for coiling up the finished strip which are arranged after the finishing train.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19758108A DE19758108C1 (en) | 1997-12-17 | 1997-12-17 | Method and installation for continuous production of hot rolled thin flat products |
DE19758108 | 1997-12-17 | ||
PCT/DE1998/003259 WO1999030847A1 (en) | 1997-12-17 | 1998-11-03 | Method and installation for the continuous production of hot-rolled, thin flat products |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1047510A1 EP1047510A1 (en) | 2000-11-02 |
EP1047510B1 true EP1047510B1 (en) | 2002-04-24 |
Family
ID=7853523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98962221A Expired - Lifetime EP1047510B1 (en) | 1997-12-17 | 1998-11-03 | Method and installation for the continuous production of hot-rolled, thin flat products |
Country Status (9)
Country | Link |
---|---|
US (1) | US6527882B1 (en) |
EP (1) | EP1047510B1 (en) |
JP (1) | JP4677097B2 (en) |
AT (1) | ATE216639T1 (en) |
AU (1) | AU745206B2 (en) |
CA (1) | CA2314171C (en) |
DE (2) | DE19758108C1 (en) |
ES (1) | ES2172948T3 (en) |
WO (1) | WO1999030847A1 (en) |
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DE102009032358A1 (en) | 2008-12-09 | 2010-06-10 | Sms Siemag Ag | Method for continuous or discontinuous production of hot rolled strips from steel, comprises subjecting a cast strip as pre-band to a heat treatment process and subsequently rolling up or stacking as hot-rolled strip |
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-
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- 1997-12-17 DE DE19758108A patent/DE19758108C1/en not_active Expired - Fee Related
-
1998
- 1998-11-03 EP EP98962221A patent/EP1047510B1/en not_active Expired - Lifetime
- 1998-11-03 US US09/581,864 patent/US6527882B1/en not_active Expired - Lifetime
- 1998-11-03 ES ES98962221T patent/ES2172948T3/en not_active Expired - Lifetime
- 1998-11-03 AT AT98962221T patent/ATE216639T1/en active
- 1998-11-03 JP JP2000538815A patent/JP4677097B2/en not_active Expired - Lifetime
- 1998-11-03 DE DE59803943T patent/DE59803943D1/en not_active Expired - Lifetime
- 1998-11-03 WO PCT/DE1998/003259 patent/WO1999030847A1/en active IP Right Grant
- 1998-11-03 CA CA002314171A patent/CA2314171C/en not_active Expired - Lifetime
- 1998-11-03 AU AU17493/99A patent/AU745206B2/en not_active Expired
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DE102008061206A1 (en) | 2008-01-15 | 2009-07-16 | Sms Demag Ag | Method for continuous or discontinuous production of hot-rolled strips made of steel, comprises subjecting a cast strip as a pre-strip to a first thermal treatment process, and subsequently winding and stacking as a hot strip |
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WO2010066412A1 (en) | 2008-12-09 | 2010-06-17 | Sms Siemag Ag | Method for producing strips of metal, and production line for performing the method |
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TWI421138B (en) * | 2008-12-09 | 2014-01-01 | Sms Siemag Ag | Process to produce metallic bands and production device to perform the process |
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Also Published As
Publication number | Publication date |
---|---|
AU745206B2 (en) | 2002-03-14 |
ATE216639T1 (en) | 2002-05-15 |
DE59803943D1 (en) | 2002-05-29 |
ES2172948T3 (en) | 2002-10-01 |
EP1047510A1 (en) | 2000-11-02 |
CA2314171A1 (en) | 1999-06-24 |
JP4677097B2 (en) | 2011-04-27 |
US6527882B1 (en) | 2003-03-04 |
JP2002508253A (en) | 2002-03-19 |
WO1999030847A1 (en) | 1999-06-24 |
AU1749399A (en) | 1999-07-05 |
DE19758108C1 (en) | 1999-01-14 |
CA2314171C (en) | 2007-04-24 |
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