EP2162557B1 - Process for hot rolling and for heat treatment of a steel strip - Google Patents

Process for hot rolling and for heat treatment of a steel strip Download PDF

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Publication number
EP2162557B1
EP2162557B1 EP08758994A EP08758994A EP2162557B1 EP 2162557 B1 EP2162557 B1 EP 2162557B1 EP 08758994 A EP08758994 A EP 08758994A EP 08758994 A EP08758994 A EP 08758994A EP 2162557 B1 EP2162557 B1 EP 2162557B1
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EP
European Patent Office
Prior art keywords
strip
cooling
heating
temperature
coil
Prior art date
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Active
Application number
EP08758994A
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German (de)
French (fr)
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EP2162557A1 (en
Inventor
Joachim Ohlert
Ingo Schuster
Peter Sudau
Jürgen Seidel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
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SMS Siemag AG
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Publication date
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Priority to SI200830299T priority Critical patent/SI2162557T1/en
Priority to PL08758994T priority patent/PL2162557T3/en
Publication of EP2162557A1 publication Critical patent/EP2162557A1/en
Application granted granted Critical
Publication of EP2162557B1 publication Critical patent/EP2162557B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0252—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with application of tension
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0452—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment with application of tension
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0463—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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

Definitions

  • the invention relates to a method for hot rolling and for heat treating a strip of steel.
  • Hardening and subsequent tempering of steel components is common practice. This ensures that a desired combination of strength and toughness of the material can be adjusted specifically.
  • This technology is also used in principle in the production of higher-strength steel sheets in sheet metal plants. It is in the EP 1 764 423 A1 described.
  • the sheet is cooled at high speed, for example to room temperature, ie it is the hardening process completed.
  • the annealing process ie the reheating of the strip to, for example, 600 ° C, followed by another cooling. In this way, sheets with different properties can be produced flexibly in small batches in a sheet metal frame.
  • JP 04 358022 A Similar methods are known from JP 04 358022 A , from the JP 04 358023 A and from the JP 58 009919 A known.
  • the present invention is therefore based on the object to provide a method by which a more economical production of high and very high-strength tapes with sufficient toughness in a belt system is possible.
  • Step e) can be immediately followed by step d).
  • the belt may be subjected to a straightening process during cooling or after cooling after step c) and / or step g). It can also be subjected to a straightening process between the uncoiling after step e) and the heating after step f). It may also be subjected to a straightening process between the heating after step f) and the removal after step h).
  • the straightening process mentioned can be done by deflecting the belt around ground, deflection, driving or other roles.
  • the straightening process is generally carried out with a roller straightening machine or employed band deflection rollers or, according to a special embodiment of the invention, on a so-called skin-pass framework.
  • the tape may also be subjected to a straightening process during the heating of the above step f).
  • the cooling of the belt after step c) may comprise laminar cooling and subsequent intensive cooling. Cooling the tape after step g) may also include laminar cooling or, alternatively or additively, air cooling.
  • At least parts of the cooling device can be designed as zone cooling, which act zone-wise over the bandwidth.
  • the cooling of the belt can also be done with a high-pressure beam, whereby a simultaneous cleaning or descaling of the belt is possible.
  • the heating of the strip according to step f) may comprise inductive heating.
  • a direct flame impingement of the strip can take place.
  • the direct application of flame to the strip takes place by means of a gas jet with at least 75% oxygen, preferably with almost pure oxygen, into which a gaseous or liquid fuel is mixed.
  • a further development provides that the inductive heating of the strip takes place under inert gas (protective gas).
  • the removal of the tape after step h) may comprise a winding of the tape.
  • the removal of the tape after step h) may also include a pushing off of plate-like cut parts of the tape.
  • the strip preferably has a temperature of at least 750 ° C. before cooling after step c).
  • It preferably has a temperature of at least 25 ° C and at most 400 ° C, preferably between 100 ° C and 300 ° C after cooling after step c) and before the coiling after step d).
  • the strip after heating after step f) has a temperature of at least 400 ° C., preferably between 400 ° C. and 700 ° C.
  • the strip may preferably have a temperature of at most 200 ° C, preferably between 25 ° C and 200 ° C.
  • the heating of the tape can be done differently over the bandwidth.
  • steps e) to g) are carried out in reversing operation, for which purpose a coiling station located behind the cooling after step g) is used.
  • planarity of the strip and / or the temperature of the strip is measured at at least two locations of the strip treatment plant for monitoring the quality of the strip.
  • the throughput speed of the belt through the belt treatment plant, in particular zone-related belt heating, the adjustment of the straightening rollers and / or the particular zone-related belt cooling can be controlled or regulated by a process model.
  • the strip when passing through the strip treatment plant, the strip can be held at least in sections by means of drivers under a defined strip tension. This is especially true in the area of the intensive cooling section.
  • a band side guide is preferably arranged in front of it.
  • a tape tension can be built up by means of a driver.
  • the band can be guided by means of a lateral guide transversely to its longitudinal axis.
  • the lateral guidance can preferably take place in the region of the cooling of the belt, in particular in the area of the laminar cooling of the belt.
  • the side guide of the tape can also be done in front of the driver and open after passing the tape head and close again at the end of the tape for the purpose of leadership task.
  • a measurement of the strip temperature can be carried out by means of a low-temperature radiation pyrometer.
  • the measurement of the strip temperature can preferably take place before, inside and / or behind temperature-variable cooling and / or heating devices.
  • the process presented can set properties for which higher alloy contents are necessary in conventional production.
  • Coils or plates may also be cut, depending on the purpose of the tape or the windability. The cutting of the plates is preferably carried out at a higher temperature, d. H. especially at tempering temperature.
  • a hot strip mill in which a band 1 first in a first process stage (indicated by l.) And then in a second process stage (indicated by II.) Is processed.
  • a slab is first rolled in a multi-stand rolling mill. Shown are from the Walzée only the last three finishing stands 7, which have rolled the band 6 with an intermediate thickness. Following this, the temperature distribution in the strip or the flatness can be measured. Subsequently, the belt 1 passes in the conveying direction F in a belt cooling 8, which is here from an intensive laminar belt cooling 9 with so-called. Edge Masking and a laminar belt cooling 10 divided. The conveying speed is for example 6 m / s.
  • the cooled strip 1 passes into an intensive cooling 11, in which according to a preferred embodiment of the invention, a straightening machine and driver are integrated (details in this Fig. 4 ). It can be provided before and behind the intensive cooling 11 drivers.
  • a measurement of the temperature distribution and the flatness of the strip can again follow.
  • a low-temperature radiation pyrometer is used at these low temperatures.
  • a temperature measurement is conceivable between two pinch rolls or driver rolls for the purpose of temperature / coolant control.
  • the coil 2 is first unwound in a unwinding station 4 and then fed to a straightening machine 14 (this can be arranged in front of and / or behind the adjoining oven). After a temperature compensation over the length and width of the tape has taken place in a zone 15, the tape 1 enters an oven 16. It is possible and advantageous to integrate into the oven 16 analogous to the cooling of a straightening machine (for details see Fig. 5 ).
  • the belt 1 can be heated in continuous or reverse operation. Preferably comes an oxyfuel furnace or an induction furnace is used, the heating time is between 10 and 600 seconds.
  • the strip 1 enters a laminar belt cooling or, alternatively, an air cooling system 19. This can be followed by a straightening machine 20.
  • Fig. 1 is then still a Plattenabschiebeech 21 and a reel 22 indicated in a Aufhaspelstation 5.
  • a skin-pass scaffold can also be arranged here.
  • Coils from other hot strip mills can also be introduced at the location of the unwinding station 4.
  • Fig. 2 the plant is not shown fully equipped.
  • the last stands of a hot strip mill (finishing line 7), the belt cooling 8 and the reels 12 and 13 of the 1st process stage are shown here.
  • the last reel 23 is provided for winding the higher strength belts. This may advantageously be a special reel for easy winding of high-strength steels.
  • the reel 23 is in this case a so-called transfer reel.
  • the coil does not need to be bound there. Pivoting pinch rollers hold the tape under tension as it is rotated to the unwind position. Immediately after winding, therefore, the further processing takes place in the starting line (2nd process stage).
  • the further transport takes place analogously as in the solution according to Fig. 1 ,
  • the band 1 before heating in the oven 16 already has a temperature above the ambient temperature T 0 .
  • a temperature profile for the belt 1 along the belt line is corresponding to Fig. 2 in Fig. 3 played.
  • the cooling to the end of the line is preferably a water or air cooling.
  • a cooling can also be done with a high pressure bar. This is carried out at the same time a cleaning or descaling of the strip surface.
  • the production amount of the rolling mill is usually higher than during the tempering process, since the rolling speed of the strip is greater than the starting speed. It is therefore also a so-called.
  • Mixed Rolling rolling operation possible to optimally utilize the rolling mill. This means that a number of ribbons are wound on reels 12 and 13 while the further processing of the higher strength ribbon occurs in the tempering line.
  • the production of the strip is thus essentially divided into two process stages, which are given below by way of example with further optional steps:
  • strip edge heaters in front of a conventional finishing line, edge masking in the first cooling line units, and a straightening machine are advantageous.
  • a fast coil transport to the subsequent 2nd process stage is advantageous to save heating energy when starting.
  • the transport of the coils can then be done under a heat-insulating hood to reduce the loss of temperature and to ensure more uniform material properties.
  • the bands can be cut into sheets in front of the oven, behind the oven and / or immediately before the sheet removal unit.
  • the cutting of panels is particularly advantageous in difficult to be wound tapes. Cutting at tempering temperature is advantageous because the strip has a lower strength there.
  • a flame cutting machine For thicker strips and / or high strength steels that can no longer be cut, a flame cutting machine, a laser cutting machine or a thermal cutting machine is provided for cutting.
  • the scaling properties are also favorable or the growth of scale is very low (operate with low air).
  • the high flow rate of the gases even has a cleaning effect on the strip surface. With regard to strip surface quality, this type of heating is particularly advantageous. With this method similar high heat densities can be achieved with good efficiency, as in inductive heating.
  • the straightening machine and the belt cooling can also be accommodated in a combined unit.
  • the straightening rollers are then used simultaneously as water squeezing rollers and thus ensure as uniform a cooling effect as possible over the width of the belt, because possible transverse strains and unevenness are eliminated directly during formation.
  • the adjustment of the straightening rollers is done individually depending on the belt temperature and the material quality with the support of a straightening machine model, so that overstretching of the belt surface can be avoided.
  • Drivers in front of and behind the cooling drafting unit ensure that the strip pulls as long as possible, even if the scaffolding or the coiler has not been erected.
  • Part of the strip cooling may be in the form of a strip zone cooling in order to be able to actively influence the temperature distribution.
  • the cooling-straightening unit is in the FIGS. 1 and 2 indicated. Details on this go out Fig. 4 out. In this figure, any possible combinations for straightening, cooling and squeezing can be seen.
  • the cooling-straightening unit is designed to be raised and swiveled, especially in thinner tape, which also in Fig. 4 is indicated (see double arrow).
  • the straightening rollers are individually adjustable.
  • a temperature scanner for the band can be provided.
  • a tape head shape detector for detecting a ski or waves
  • a tape head shape detector for detecting a ski or waves
  • the directing amount is set individually depending on the material of the tape and the temperature.
  • the straightening and cooling unit can be lifted and swiveled.
  • the straightening and heating process 14, 16 of the second process stage combined with the system shown can be driven.
  • the indicative amount can be adjusted to the existing strip temperature and the strip material.
  • the effect of the skin effect (higher surface temperature) of the induction heating (or a direct application of flame in the DFI oxyfuel process) has a positive effect.
  • the straightening rollers keep the belt in position and avoid unevenness, so that the most efficient (inductive) heating in the long filet part of the belt is possible.
  • Driver 29 in front of and behind the heating-straightening unit keep the tape under tensile stress 30.
  • the induction coils 32 and straightening and transfer rollers 31 are designed to be vertically adjustable.
  • cooling-straightening unit ( Fig. 4 ) or the heating-straightening unit ( Fig. 5 ) is not limited to a belt system, but can also be provided in a heavy plate plant.
  • a temperature scanner for the band can be provided.
  • balancing the belt temperature across the length and width of the belt may be accomplished by selective cooling (zone cooling) or heating to warm or cold belt sections. This should be provided in particular, if not completely cooled to ambient temperature coils should be treated. As a result, the passage of the coils can be shortened by the Coillager.
  • a coil tracking system (model) and the measured temperature distributions during unwinding of the coil are used to optimally control the heating or cooling units.
  • job-welded high-wear roller materials are used to ensure a long service life and good strip quality.
  • Temperature scanners and flatness measuring devices within the line indirectly monitor the quality of the strip and serve as a signal for actuators and control elements, such. For example, for the flow rate, the heating power, the straightening roller adjustment and the cooling, which are controlled by a process model.
  • Fig. 6 the first process step is shown in a somewhat modified embodiment.
  • Analogous to Fig. 1 shows Fig. 6 the rear part of the finishing train 7, laminar belt cooling units 9, 10 and an intensive cooling 11 and the Aufhaspelstationen 3.
  • the intensive cooling 11 and a band straightening unit 36.1, 36.2 are arranged at different locations. Before and behind the intensive cooling 11 drivers 34 and 35 are positioned. This makes it possible to maintain a strip tension within the intensive cooling 11 almost for the entire strip length, without the strip being clamped in the frame or coiler. This will be pulled out possibly occurring tape shafts, thus achieving the most uniform cooling effect.
  • a band side guide 33.1 is arranged in front of it in a particularly advantageous manner. After the tape head has passed the driver 33.1 and the intensive cooling 11, the side guide 33.1 is opened again, so that the water flow in the laminar belt cooling 10 is not hindered. The leadership task then takes over the leadership of the rest of the band 33.2. Analogously, the guide 33.1 is briefly made again for the end of the tape after the end has left the finishing line to counteract a running of the tape end. Therefore, in order to minimize the cooling path length, the side guide 33. 1 is preferably arranged within the laminar belt cooling unit 10.
  • the straightening rollers 36.1, 36.2 before each Aufhaspelstationen 3 are immersed in the band level after construction of the strip tension and ensure by wrapping the bottom, deflection or drive rollers for a band straightening effect.
  • a similar mode of operation is practiced if, within the intensive cooling section 11 deflection rollers 26 (s. Fig. 4 ) are arranged.

Abstract

The invention relates to a process for hot rolling and for heat treatment of a strip (1) of steel. To make it possible to produce high-strength and very high-strength strips having satisfactory toughnesses more economically in a continuous production plant, the process provides the steps: a) heating of the slab to be rolled; b) rolling of the slab to the desired strip thickness; c) cooling of the strip (1), with the strip (1) having a temperature above ambient temperature (T0) after cooling; d) rolling up of the strip (1) to produce a coil (2); e) rolling off of the strip (1) from the coil (2); f) heating of the strip (1); g) cooling of the strip (1) and h) transport of the strip (1) to a further destination, with the strip (1) having a temperature above ambient temperature (T0) before heating as per step T).

Description

Die Erfindung betrifft ein Verfahren zum Warmwalzen und zur Wärmebehandlung eines Bandes aus Stahl.The invention relates to a method for hot rolling and for heat treating a strip of steel.

Das Härten und anschließende Anlassen von Stahlbauteilen ist gängige Praxis. Damit wird erreicht, dass eine gewünschte Kombination von Festigkeit und Zähigkeit des Werkstoffs gezielt eingestellt werden kann. Diese Technologie wird prinzipiell auch bei der Herstellung höherfester Stahlbleche in Blechanlagen eingesetzt. Es ist in der EP 1 764 423 A1 beschrieben. Hier wird nach dem Erwärmen der Bramme und dem Herunterwalzen auf die Enddicke auf dem Grobblechgerüst in mehreren Reversierstichen das Blech mit hoher Geschwindigkeit beispielsweise bis auf Raumtemperatur abgekühlt, d. h. es wird der Härtevorgang vollzogen. Im Anschluss daran folgt der Anlassprozess, d. h. die Wiedererwärmung des Bandes auf beispielsweise 600 °C, woran sich ein erneutes Abkühlen anschließt. Damit können in einem Blechgerüst Bleche mit verschiedenen Eigenschaften flexibel in kleinen Losgrößen hergestellt werden.Hardening and subsequent tempering of steel components is common practice. This ensures that a desired combination of strength and toughness of the material can be adjusted specifically. This technology is also used in principle in the production of higher-strength steel sheets in sheet metal plants. It is in the EP 1 764 423 A1 described. Here, after the heating of the slab and the rolling down to the final thickness on the plate mill in several reversing passes the sheet is cooled at high speed, for example to room temperature, ie it is the hardening process completed. This is followed by the annealing process, ie the reheating of the strip to, for example, 600 ° C, followed by another cooling. In this way, sheets with different properties can be produced flexibly in small batches in a sheet metal frame.

Ähnliche Verfahren sind aus der JP 04 358022 A , aus der JP 04 358023 A und aus der JP 58 009919 A bekannt.Similar methods are known from JP 04 358022 A , from the JP 04 358023 A and from the JP 58 009919 A known.

Wie im Bereich der Blechherstellung nimmt auch bei der Bandherstellung die Nachfrage nach Stahlsorten mit sehr hoher Festigkeit ständig zu, d. h. die Nachfrage nach sog. hochfesten und höchstfesten Stählen. Anwendung finden diese Werkstoffe unter anderem bei Kraftfahrzeugen, bei Kränen, bei Behältern und bei Rohren.As in the field of sheet metal production, the demand for steel grades with very high strength is constantly increasing in strip production as well. H. the demand for so-called high-strength and ultra-high-strength steels. These materials are used, inter alia, in motor vehicles, cranes, containers and pipes.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zu schaffen, mit dem eine wirtschaftlichere Herstellung von hoch- und höchstfesten Bändern mit ausreichenden Zähigkeiten in einer Bandanlage möglich wird. Insbesondere sollen damit vorteilhaft QT-Stähle hergestellt werden können.The present invention is therefore based on the object to provide a method by which a more economical production of high and very high-strength tapes with sufficient toughness in a belt system is possible. In particular, it should therefore be possible to produce QT steels in an advantageous manner.

Die Lösung dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass das Verfahren die Schritte aufweist:

  1. a) Erwärmen der zu walzenden Bramme;
  2. b) Walzen der Bramme auf die gewünschte Banddicke;
  3. c) Kühlen des Bandes, wobei das Band nach dem Kühlen in der Regel eine über der Umgebungstemperatur liegende Temperatur aufweist;
  4. d) Aufhaspeln des Bandes zu einem Coil;
  5. e) Abhaspeln des Bandes vom Coil;
  6. f) Erhitzen des Bandes;
  7. g) Kühlen des Bandes und
  8. h) Abtransport des Bandes,
wobei das Band vor der Erwärmung gemäß Schritt f) eine über der Umgebungstemperatur liegende Temperatur aufweist und wobei das Coil bei der Durchführung des Schritts d) an einer Aufhaspelstation befindet und dass sich das Coil bei der Durchführung des Schritts e) an einer von der Aufhaspelstation räumlich entfernten Abhaspelstation befindet, wobei das Coil zwischen Schritt d) und e) wärmeisoliert von der Aufhaspelstation zur Abhaspelstation transportiert wird.The solution of this object by the invention is characterized in that the method comprises the steps of:
  1. a) heating the slab to be rolled;
  2. b) rolling the slab to the desired strip thickness;
  3. c) cooling the belt, wherein the belt after cooling generally has a temperature above the ambient temperature;
  4. d) coiling the tape into a coil;
  5. e) unwinding the tape from the coil;
  6. f) heating the tape;
  7. g) cooling the tape and
  8. h) removal of the tape,
wherein the strip has a temperature above ambient temperature prior to heating in step f), and wherein the coil is at a coiling station when step d) is performed, and that the coil spatially rests at one of the coiling station when step e) is performed distant unwinding station, wherein the coil between step d) and e) is heat-insulated transported from the coiling station to Abhaspelstation.

Der Schritt e) kann sich unverzüglich an Schritt d) anschließen.Step e) can be immediately followed by step d).

Das Band kann während des Kühlens oder nach dem Kühlen nach Schritt c) und/oder Schritt g) einem Richtprozess unterzogen werden. Es kann zwischen dem Abhaspeln nach Schritt e) und dem Erhitzen nach Schritt f) auch einem Richtprozess unterzogen werden. Es kann weiter zwischen dem Erhitzen nach Schritt f) und dem Abtransport nach Schritt h) einem Richtprozess unterzogen werden. Der genannte Richtprozess kann durch Umlenkung des Bandes um Boden-, Umlenk-, Treib- oder sonstige Rollen erfolgen.The belt may be subjected to a straightening process during cooling or after cooling after step c) and / or step g). It can also be subjected to a straightening process between the uncoiling after step e) and the heating after step f). It may also be subjected to a straightening process between the heating after step f) and the removal after step h). The straightening process mentioned can be done by deflecting the belt around ground, deflection, driving or other roles.

Der Richtprozess wird in der Regel mit einer Rollenrichtmaschine bzw. angestellten Bandumlenkrollen oder gemäß einer speziellen Ausführungsform der Erfindung auf einem sog. Skin-Pass-Gerüst durchgeführt.The straightening process is generally carried out with a roller straightening machine or employed band deflection rollers or, according to a special embodiment of the invention, on a so-called skin-pass framework.

Das Band kann auch während des Erwärmens nach obigem Schritt f) einem Richtprozess unterzogen werden.The tape may also be subjected to a straightening process during the heating of the above step f).

Das Kühlen des Bandes nach Schritt c) kann eine laminare Kühlung und nachgeschaltete Intensivkühlungen umfassen. Das Kühlen des Bandes nach Schritt g) kann auch eine laminare Kühlung oder alternativ oder additiv eine Luftkühlung umfassen.The cooling of the belt after step c) may comprise laminar cooling and subsequent intensive cooling. Cooling the tape after step g) may also include laminar cooling or, alternatively or additively, air cooling.

Zumindest Teile der Kühleinrichtung können als Zonenkühlung ausgebildet sein, die zonenweise über der Bandbreite wirken.At least parts of the cooling device can be designed as zone cooling, which act zone-wise over the bandwidth.

Das Kühlen des Bandes kann auch mit einem Hochdruckbalken erfolgen, womit eine gleichzeitige Reinigung bzw. Entzunderung des Bandes möglich wird.The cooling of the belt can also be done with a high-pressure beam, whereby a simultaneous cleaning or descaling of the belt is possible.

Das Erhitzen des Bandes gemäß Schritt f) kann eine induktive Erwärmung umfassen. Hierbei kann alternativ auch eine direkte Flammenbeaufschlagung des Bandes erfolgen. In letzterem Falle ist bevorzugt vorgesehen, dass die direkte Flammenbeaufschlagung des Bandes durch einen Gasstrahl mit mindestens 75% Sauerstoff- vorzugsweise mit fast reinem Sauerstoff- erfolgt, in den ein gasförmiger oder flüssiger Brennstoff gemischt wird.The heating of the strip according to step f) may comprise inductive heating. In this case, alternatively, a direct flame impingement of the strip can take place. In the latter case, it is preferably provided that the direct application of flame to the strip takes place by means of a gas jet with at least 75% oxygen, preferably with almost pure oxygen, into which a gaseous or liquid fuel is mixed.

Eine Weiterbildung sieht vor, dass die induktive Erwärmung des Bandes unter Inertgas (Schutzgas) erfolgt.A further development provides that the inductive heating of the strip takes place under inert gas (protective gas).

Der Abtransport des Bandes nach Schritt h) kann ein Aufhaspeln des Bandes umfassen. Der Abtransport des Bandes nach Schritt h) kann auch ein Abschieben von plattenartig geschnittenen Teilen des Bandes umfassen.The removal of the tape after step h) may comprise a winding of the tape. The removal of the tape after step h) may also include a pushing off of plate-like cut parts of the tape.

Das Band weist vorzugsweise vor dem Kühlen nach Schritt c) eine Temperatur von mindestens 750 °C auf.The strip preferably has a temperature of at least 750 ° C. before cooling after step c).

Es hat bevorzugt nach dem Kühlen nach Schritt c) und vor dem Aufhaspeln nach Schritt d) eine Temperatur von mindestens 25 °C und höchstens 400 °C, vorzugsweise zwischen 100 °C und 300°C.It preferably has a temperature of at least 25 ° C and at most 400 ° C, preferably between 100 ° C and 300 ° C after cooling after step c) and before the coiling after step d).

Weiterhin sieht eine Fortbildung vor, dass das Band nach dem Erhitzen nach Schritt f) eine Temperatur von mindestens 400 °C, vorzugsweise zwischen 400 °C und 700 °C, aufweist. Indes kann das Band vorzugsweise nach dem Kühlen nach Schritt g) und vor dem Abtransport nach Schritt h) eine Temperatur von höchstens 200 °C, vorzugsweise zwischen 25 °C und 200°C, besitzen.Furthermore, a further development provides that the strip after heating after step f) has a temperature of at least 400 ° C., preferably between 400 ° C. and 700 ° C. However, after cooling after step g) and before removal after step h), the strip may preferably have a temperature of at most 200 ° C, preferably between 25 ° C and 200 ° C.

Das Erhitzen des Bandes kann über der Bandbreite unterschiedlich stark erfolgen.The heating of the tape can be done differently over the bandwidth.

Schließlich kann vorgesehen werden, dass die Schritte e) bis g) im Reversierbetrieb vollzogen werden, wozu eine sich hinter der Kühlung nach Schritt g) befindliche Aufhaspelstation eingesetzt wird.Finally, it can be provided that the steps e) to g) are carried out in reversing operation, for which purpose a coiling station located behind the cooling after step g) is used.

Weiterhin kann vorgesehen werden, dass an mindestens zwei Orten der Bandbehandlungsanlage zur Überwachung der Qualität des Bandes die Planheit des Bandes und/oder die Temperatur des Bandes (letztere bevorzugt mittels eines Temperaturscanners) gemessen wird.Furthermore, it can be provided that the planarity of the strip and / or the temperature of the strip (the latter preferably by means of a temperature scanner) is measured at at least two locations of the strip treatment plant for monitoring the quality of the strip.

Die Durchlaufgeschwindigkeit des Bandes durch die Bandbehandlungsanlage, die insbesondere zonenbezogene Bandbeheizung, die Anstellung der Richtrollen und/oder die insbesondere zonenbezogene Bandkühlung können durch ein Prozessmodell gesteuert bzw. geregelt werden.The throughput speed of the belt through the belt treatment plant, in particular zone-related belt heating, the adjustment of the straightening rollers and / or the particular zone-related belt cooling can be controlled or regulated by a process model.

Das Band kann schließlich beim Passieren der Bandbehandlungsanlage zumindest abschnittsweise mittels Treibern unter einem definierten Bandzug gehalten werden. Dies gilt besonders im Bereich der Intensivkühlstrecke.Finally, when passing through the strip treatment plant, the strip can be held at least in sections by means of drivers under a defined strip tension. This is especially true in the area of the intensive cooling section.

Um ein zentrisches Einlaufen des Bandes in den Treiber, in die Rollenrichteinheit oder in die Intensivkühlung zu gewährleisten, ist bevorzugt eine Bandseitenführung davor angeordnet.In order to ensure a centric running in of the tape in the driver, in the roller straightening unit or in the intensive cooling, a band side guide is preferably arranged in front of it.

Eine alternative Ausführungsform des Verfahrens zum Warmwalzen und zur Wärmebehandlung eines Bandes aus Stahl weist die Schritte auf:

  1. a) Erwärmen der zu walzenden Bramme;
  2. b) Walzen der Bramme auf die gewünschte Banddicke;
  3. c) Kühlen des Bandes, wobei das Band nach dem Kühlen eine über der Umgebungstemperatur liegende Temperatur aufweist;
  4. d) Aufhaspeln des Bandes auf einem ersten Haspel;
  5. e) Reversieren des Bandes zwischen dem ersten Haspel und einem zweiten Haspel, wobei das Band zwischen den Haspeln einer Erhitzung zwecks Durchführung eines Anlassvorgangs unterzogen wird,
wobei das Band vor der Erwärmung gemäß Schritt e) eine über der Umgebungstemperatur liegende Temperatur aufweist.An alternative embodiment of the method for hot rolling and heat treating a strip of steel comprises the steps of:
  1. a) heating the slab to be rolled;
  2. b) rolling the slab to the desired strip thickness;
  3. c) cooling the tape, the tape having a temperature above ambient temperature after cooling;
  4. d) coiling the tape on a first reel;
  5. e) reversing the tape between the first reel and a second reel, the tape between the reels being subjected to heating for the purpose of performing a tempering operation,
wherein the strip has a temperature above ambient temperature prior to heating in step e).

Dieses Verfahren kann auch mit den oben genannten Ausgestaltungen kombiniert werden.This method can also be combined with the above-mentioned embodiments.

Folgende Fortbildungen haben sich weiterhin bewährt:The following training courses have continued to prove themselves:

Vor und hinter der Kühlung des Bandes kann mittels Treiber ein Bandzug aufgebaut werden.Before and behind the cooling of the tape, a tape tension can be built up by means of a driver.

Das Band kann mittels einer Seitenführung quer zu seiner Längsachse geführt werden. Die Seitenführung kann dabei bevorzugt im Bereich der Kühlung des Bandes erfolgen, insbesondere im Bereich der laminaren Kühlung des Bandes.The band can be guided by means of a lateral guide transversely to its longitudinal axis. The lateral guidance can preferably take place in the region of the cooling of the belt, in particular in the area of the laminar cooling of the belt.

Die Seitenführung des Bandes kann ferner vor dem Treiber erfolgen und nach dem Passieren des Bandkopfes öffnen sowie am Bandende zwecks Führungsaufgabe wieder schließen.The side guide of the tape can also be done in front of the driver and open after passing the tape head and close again at the end of the tape for the purpose of leadership task.

Eine Messung der Bandtemperatur kann mittels eines Niedertemperatur-Strahlungspyrometers erfolgen. Die Messung der Bandtemperatur kann vorzugsweise vor, innerhalb und/oder hinter temperatur-verändemden Kühl- und/oder Heizeinrichtungen erfolgen.A measurement of the strip temperature can be carried out by means of a low-temperature radiation pyrometer. The measurement of the strip temperature can preferably take place before, inside and / or behind temperature-variable cooling and / or heating devices.

Das Produktionsspektrum einer Warmbreitbandstraße unterscheidet sich erheblich von dem einer Grobblechstraße. So existiert eine Vielzahl während der letzten Jahrzehnte neu entwickelter hoch- und höchstfester Stahlsorten, deren Eigenschaften durch gezielte Walz- und/oder Abkühlstrategien eingestellt werden können. Ein geeignetes Verfahren dazu ist nach dem Walzen ein Abschrecken des Bandes mit hoher Abkühlgeschwindigkeit, gefolgt von einer Wiedererwärmung auf Temperaturen unterhalb der Phasenumwandlungstemperatur.The production spectrum of a hot strip mill differs considerably from that of a heavy plate mill. Thus, there is a large number of newly developed high-strength and ultra-high-strength steel grades during the last decades, whose properties can be adjusted by specific rolling and / or cooling strategies. A suitable method for this, after rolling, is to quench the strip at a high cooling rate, followed by reheating to temperatures below the phase transition temperature.

Die auf diesem Wege herstellbaren klassischen QT-Stähle (Q: quenched; T: tempered) werden bereits auf Grobblechgerüsten produziert. Sie lassen sich allerdings in Warmbreitbandstraßen wesentlich wirtschaftlicher herstellen.The classical QT steels (Q: quenched, T: tempered) that can be produced in this way are already being produced on heavy-plate stands. However, they can be produced much more economically in hot strip mills.

Weiterhin sind auf Warmbandstraßen auch dünnere höchstfeste Bänder mit geringerer Temperatur- und Dickentoleranz sowie Bandplanheit sicherer erzeugbar. Es ist daher sinnvoll und vorteilhaft, Produktionsanteile von Grobblechgerüsten auf Bandstraßen zu verlagern.Furthermore, on hot strip mills and thinner high-strength tapes with lower temperature and thickness tolerance and flat flatness can be generated safely. It is therefore useful and advantageous to shift production shares of heavy plate stands on strip lines.

Darüber hinaus existieren vielerlei neuartige Stahlsorten, die auf Grobblechgerüsten nicht hergestellt werden. Für die Gruppe der Mehrphasenstähle ist das hier vorgestellte Verfahren in besonderem Maße geeignet. Mittels eines deutlich vergrößerten Spektrums an Temperatur-Zeit-Verläufen und insbesondere mittels der Möglichkeit, die Abkühlung zu unterbrechen und die Temperatur vorübergehend wieder zu erhöhen, lassen sich Gefüge mit nahezu beliebigen Kombinationen von Phasenbestandteilen erzeugen, die derzeit nicht darstellbar sind. Außerdem besteht die Möglichkeit, Ausscheidungsvorgänge ablaufen zu lassen und so gezielt Zweitphasen einzuführen, die ein Charakteristikum moderner Stahlsorten darstellen.In addition, there are many new types of steel that are not produced on heavy plate stands. For the group of multiphase steels, the method presented here is particularly suitable. By means of a significantly enlarged spectrum of temperature-time curves and in particular by means of the possibility of interrupting the cooling and temporarily increasing the temperature again, it is possible to produce microstructures with virtually any combination of phase components which can not be produced at present. In addition, it is possible to run elimination operations and thus introduce targeted second phases, which are a characteristic of modern steel grades.

Weiterhin lassen sich durch das vorgestellte Verfahren Eigenschaften einstellen, für die bei konventioneller Fertigung höhere Legierungsgehalte notwendig sind.Furthermore, the process presented can set properties for which higher alloy contents are necessary in conventional production.

Vorteilhaft ist bei der separaten Anordnung des Walz- und Kühlprozesses einerseits und des Anlassprozesses andererseits die Flexibilität des Verfahrens (kein Mixed-Rolling notwendig), die flexible Einstellung des Temperatur-Zeit-Verlaufes des Bandes und dass eigene Coils oder Coils von anderen Anlagen verarbeitet werden können. Es können auch Coils oder Platten geschnitten werden, in Abhängigkeit vom Verwendungszweck des Bandes oder der Wickelbarkeit. Das Schneiden der Platten erfolgt dabei bevorzugt bei höherer Temperatur, d. h. namentlich bei Anlasstemperatur.It is advantageous in the separate arrangement of the rolling and cooling process on the one hand and the annealing process on the other hand, the flexibility of the process (no mixed-rolling necessary), the flexible adjustment of the temperature-time curve of the tape and that own coils or coils are processed by other facilities can. Coils or plates may also be cut, depending on the purpose of the tape or the windability. The cutting of the plates is preferably carried out at a higher temperature, d. H. especially at tempering temperature.

Vorteilhaft ist bei der gekoppelten Anordnung des Walz- und Kühlprozesses und des Anlassprozesses die besonders große Energieeinsparung, bei schwierig zu haspelnden und zu bindenden Coils der Einsatz eines Spezialhaspels mit direkter Übergabe zur Vermeidung des sog. Uhrfederproblems. Ferner ergibt sich eine schnelle Weiterverarbeitung bzw. Lieferung der Bänder bei direkter Weiterverarbeitung. Schließlich ist die größere Möglichkeit der Beeinflussung der Mikrostruktur des Bandes bei den erwähnten Anordnungen zu nennen.It is advantageous in the coupled arrangement of the rolling and cooling process and the annealing process, the particularly large energy savings, difficult to be coiled and to be bound coils, the use of a special reel with direct transfer to avoid the so-called. Clock spring problem. Furthermore, there is a fast further processing or delivery of the belts for direct further processing. Finally, the greater possibility of influencing the microstructure of the band in the mentioned arrangements should be mentioned.

In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:

Fig. 1
schematisch eine Warmbandstraße für die Herstellung eines Stahlbandes gemäß einer ersten Ausführungsform der Erfindung,
Fig. 2
eine zu Fig. 1 alternative Ausgestaltung der Warmbandstraße (nicht gemäß der Erfindung),
Fig. 3
einen exemplarischen Temperaturverlauf (nicht gemäß der Erfindung) des Bandes über der Förderrichtung der Warmbandstraße,
Fig.4
als Ausschnitt aus der Warmbandstraße gemäß Fig. 1 oder 2 den prinzipiellen Aufbau einer Richtmaschine mit integrierter Intensivkühlung,
Fig. 5
als Ausschnitt aus der Warmbandstraße gemäß Fig. 1 oder 2 den prinzipiellen Aufbau einer Richtmaschine mit integrierter Heizung und
Fig. 6
schematisch eine Warmbandstraße mit einer alternativen Ausgestaltung einer ersten Verfahrensstufe.
In the drawings, embodiments of the invention are shown. Show it:
Fig. 1
1 schematically shows a hot strip mill for the production of a steel strip according to a first embodiment of the invention,
Fig. 2
one too Fig. 1 alternative embodiment of the hot strip mill (not according to the invention),
Fig. 3
an exemplary temperature profile (not according to the invention) of the strip over the conveying direction of the hot strip mill,
Figure 4
as a section of the hot strip mill according to Fig. 1 or 2 the basic structure of a straightening machine with integrated intensive cooling,
Fig. 5
as a section of the hot strip mill according to Fig. 1 or 2 the basic structure of a straightening machine with integrated heating and
Fig. 6
schematically a hot strip mill with an alternative embodiment of a first process stage.

In Fig. 1 ist eine Warmbandstraße dargestellt, in der ein Band 1 zunächst in einer 1. Verfahrensstufe (angegeben mit l.) und anschießend in einer 2. Verfahrensstufe (angegeben mit II.) bearbeitet wird.In Fig. 1 a hot strip mill is shown, in which a band 1 first in a first process stage (indicated by l.) And then in a second process stage (indicated by II.) Is processed.

In der 1. Verfahrensstufe, d. h. in einem Walz- und Kühlprozess, wird eine Bramme zunächst in einer mehrgerüstigen Walzstraße gewalzt. Dargestellt sind von der Walzstraße nur die letzten drei Fertiggerüste 7, die das Band 6 mit einer Zwischendicke gewalzt haben. Im Anschluss hieran kann die Temperaturverteilung im Band bzw. die Planheit gemessen werden. Anschließend gelangt das Band 1 in Förderrichtung F in eine Bandkühlung 8, die sich hier aus einer intensiven laminaren Bandkühlung 9 mit sog. Edge-Masking und einer laminaren Bandkühlung 10 untergliedert. Die Fördergeschwindigkeit beträgt beispielsweise 6 m/s. Anschließend gelangt das gekühlte Band 1 in eine Intensivkühlung 11, in der gemäß einer bevorzugten Ausgestaltung der Erfindung eine Richtmaschine und Treiber integriert sind (Details hierzu in Fig. 4). Es können vor und hinter der Intensivkühlung 11 Treiber vorgesehen sein.In the first process stage, ie in a rolling and cooling process, a slab is first rolled in a multi-stand rolling mill. Shown are from the Walzstraße only the last three finishing stands 7, which have rolled the band 6 with an intermediate thickness. Following this, the temperature distribution in the strip or the flatness can be measured. Subsequently, the belt 1 passes in the conveying direction F in a belt cooling 8, which is here from an intensive laminar belt cooling 9 with so-called. Edge Masking and a laminar belt cooling 10 divided. The conveying speed is for example 6 m / s. Subsequently, the cooled strip 1 passes into an intensive cooling 11, in which according to a preferred embodiment of the invention, a straightening machine and driver are integrated (details in this Fig. 4 ). It can be provided before and behind the intensive cooling 11 drivers.

Im Anschluss an die Intensivkühlung 11 kann sich erneut eine Messung der Temperaturverteilung und der Planheit des Bandes anschließen. Bevorzugt kommt bei diesen geringen Temperaturen ein Niedertemperatur-Strahlungspyrometer zum Einsatz. Innerhalb der Intensivkühlung ist zwischen zwei Abquetsch- oder Treiberrollen auch zwecks Temperatur-Kühlmittelregelung eine Temperaturmessung denkbar.Subsequent to the intensive cooling 11, a measurement of the temperature distribution and the flatness of the strip can again follow. Preferably, a low-temperature radiation pyrometer is used at these low temperatures. Within intensive cooling, a temperature measurement is conceivable between two pinch rolls or driver rolls for the purpose of temperature / coolant control.

Dann wird das Band 1 in einer Aufhaspelstation 3 von einem Haspel 12 oder 13 aufgehaspelt.Then the tape 1 is reeled in a Aufhaspelstation 3 by a reel 12 or 13.

Dann gelangt das Coil 2 in die 2. Verfahrensstufe, d. h. in den Anlassprozess.Then the coil 2 enters the 2nd process stage, d. H. in the starting process.

Hier wird das Coil 2 zunächst in einer Abhaspelstation 4 abgehaspelt und dann einer Richtmaschine 14 zugeführt (diese kann vor und/oder hinter dem sich anschließenden Ofen angeordnet sein). Nachdem in einer Zone 15 ein Temperaturausgleich über die Länge und Breite des Bandes stattgefunden hat, gelangt das Band 1 in einen Ofen 16. Es ist möglich und vorteilhaft, in den Ofen 16 analog zur Kühlung eine Richtmaschine zu integrieren (Details hierzu in Fig. 5). Hier kann das Band 1 im Durchlauf- oder im Reversierbetrieb erhitzt werden. Bevorzugt kommt ein Oxyfuel-Ofen oder ein Induktionsofen zum Einsatz, wobei die Heizzeit zwischen 10 und 600 Sekunden beträgt.Here, the coil 2 is first unwound in a unwinding station 4 and then fed to a straightening machine 14 (this can be arranged in front of and / or behind the adjoining oven). After a temperature compensation over the length and width of the tape has taken place in a zone 15, the tape 1 enters an oven 16. It is possible and advantageous to integrate into the oven 16 analogous to the cooling of a straightening machine (for details see Fig. 5 ). Here, the belt 1 can be heated in continuous or reverse operation. Preferably comes an oxyfuel furnace or an induction furnace is used, the heating time is between 10 and 600 seconds.

Es folgen eine Besäumschere 17 und eine Schere 18. Anschließend gelangt das Band 1 in eine laminare Bandkühlung oder alternativ in eine Luftkühlung 19. Hieran kann sich eine Richtmaschine 20 anschließen. In Fig. 1 ist dann weiterhin eine Plattenabschiebeeinheit 21 bzw. ein Haspel 22 in einer Aufhaspelstation 5 angedeutet.This is followed by a trimming scissors 17 and a pair of scissors 18. Subsequently, the strip 1 enters a laminar belt cooling or, alternatively, an air cooling system 19. This can be followed by a straightening machine 20. In Fig. 1 is then still a Plattenabschiebeeinheit 21 and a reel 22 indicated in a Aufhaspelstation 5.

Statt einer Richtmaschine 14 oder 20 kann hier auch ein Skin-Pass-Gerüst angeordnet sein.Instead of a straightening machine 14 or 20, a skin-pass scaffold can also be arranged here.

An der Stelle der Abhaspelstation 4 können auch Coils aus anderen Warmbandstraßen eingeschleust werden.Coils from other hot strip mills can also be introduced at the location of the unwinding station 4.

Dem gegenüber ist eine nicht erfindungsgemäß direkte Anbindung der beiden Verfahrensstufen I. und II. in Fig. 2 zu sehen (die Anlage ist nicht voll ausgerüstet dargestellt). Analog sind hier die letzten Gerüste einer Warmbreitbandstraße (Fertigstraße 7), die Bandkühlung 8 und die Haspeln 12 und 13 der 1. Verfahrensstufe dargestellt. Der letzte Haspel 23 ist für das Wickeln der höherfesten Bänder vorgesehen. Hierbei kann es sich vorteilhafter Weise um einen Spezialhaspel zum einfachen Wickeln der hochfesten Stähle handeln. Der Haspel 23 ist in diesem Falle ein so genanter Übergabehaspel. Das Coil braucht dort nicht gebunden zu werden. Schwenkbare Klemmrollen halten das Band beim Drehen in die Abwickelposition unter Zugspannung. Unmittelbar nach dem Aufwickeln erfolgt also die Weiterverarbeitung in der Anlasslinie (2. Verfahrensstufe). Der Weitertransport erfolgt analog wie bei der Lösung gemäß Fig. 1.In contrast, a non-inventive direct connection of the two process stages I. and II. In Fig. 2 to see (the plant is not shown fully equipped). Analogously, the last stands of a hot strip mill (finishing line 7), the belt cooling 8 and the reels 12 and 13 of the 1st process stage are shown here. The last reel 23 is provided for winding the higher strength belts. This may advantageously be a special reel for easy winding of high-strength steels. The reel 23 is in this case a so-called transfer reel. The coil does not need to be bound there. Pivoting pinch rollers hold the tape under tension as it is rotated to the unwind position. Immediately after winding, therefore, the further processing takes place in the starting line (2nd process stage). The further transport takes place analogously as in the solution according to Fig. 1 ,

Besonders vorteilhaft sind auch hier die Energieeinsparung bei Bändern höherer Wickeltemperatur und der schnelle Weitertransport der Coils von der 1. zur 2. Verfahrensstufe. Es ist nämlich vorgesehen, dass das Band 1 vor der Erwärmung im Ofen 16 bereits eine über der Umgebungstemperatur T0 liegende Temperatur aufweist.Particularly advantageous here are the energy savings in bands higher winding temperature and the rapid onward transport of the coils from the 1st to the 2nd stage of the process. Namely, it is provided that the band 1 before heating in the oven 16 already has a temperature above the ambient temperature T 0 .

Zusätzlich ist auch für spezielle Bänder ein Reversieren des Bandes zwischen den beiden Haspeln 23 und 22 möglich, um gewünschte Temperaturverläufe bzw. Behandlungen des Bandes durchführen zu können.In addition, a reversal of the band between the two reels 23 and 22 is also possible for special tapes to perform desired temperature gradients or treatments of the band can.

Ein Temperaturverlauf für das Band 1 entlang der Bandstraße ist korrespondierend zur Fig. 2 in Fig. 3 wiedergegeben. Die Kühlung zum Ende der Linie ist bevorzugt eine Wasser- oder Luftkühlung.A temperature profile for the belt 1 along the belt line is corresponding to Fig. 2 in Fig. 3 played. The cooling to the end of the line is preferably a water or air cooling.

Eine Kühlung kann jedoch auch mit einem Hochdruckbalken erfolgen. Hiermit wird gleichzeitig eine Reinigung bzw. Entzunderung der Bandoberfläche durchgeführt. Die Produktionsmenge der Walzanlage ist in der Regel höher als beim Anlassprozess, da die Walzgeschwindigkeit des Bandes größer als die Anlassgeschwindigkeit ist. Es ist deshalb auch ein sog. Mixed-Rolling-Walzbetrieb möglich, um die Walzstraße optimal auszulasten. Das bedeutet, dass eine Anzahl von Bändern auf Haspel 12 und 13 gewickelt werden, während die Weiterverarbeitung des höherfesten Bandes in der Anlasslinie erfolgt.However, a cooling can also be done with a high pressure bar. This is carried out at the same time a cleaning or descaling of the strip surface. The production amount of the rolling mill is usually higher than during the tempering process, since the rolling speed of the strip is greater than the starting speed. It is therefore also a so-called. Mixed Rolling rolling operation possible to optimally utilize the rolling mill. This means that a number of ribbons are wound on reels 12 and 13 while the further processing of the higher strength ribbon occurs in the tempering line.

Die Herstellung des Bandes gliedert sich erfindungsgemäß also im wesentlichen in zwei Verfahrensstufen, die nachfolgend mit weiteren optionalen Schritten beispielhaft angegeben sind:According to the invention, the production of the strip is thus essentially divided into two process stages, which are given below by way of example with further optional steps:

1. Verfahrensstufe:1st stage of the process:

  • Erwärmen von Brammen (Dick- oder Dünnbrammen) und anschließendes Walzen in einer mehrgerüstigen Warmbreitbandstraße;Heating slabs (thick or thin slabs) and then rolling in a multistage hot strip mill;
  • Intensives Kühlen des Bandes auf dem Auslaufrollgang;Intensive cooling of the belt on the outfeed roller table;
  • Durchlauf durch eine Richtmaschine;Pass through a leveler;
  • Wickeln des Bandes zu einem Coil.Wrap the ribbon to a coil.

Um die Planheit der hochfesten Bänder zu verbessern, sind Bandkantenheizungen vor einer konventionellen Fertigstraße, Edge-Masking in den ersten Kühlstreckeneinheiten sowie eine Richtmaschine vorteilhaft.To improve the flatness of the high-strength tapes, strip edge heaters in front of a conventional finishing line, edge masking in the first cooling line units, and a straightening machine are advantageous.

Bei höheren Wickeltemperaturen ist ein schneller Coiltransport zur nachfolgenden 2. Verfahrensstufe vorteilhaft, um Heizenergie beim Anlassen einzusparen. Der Transport der Coils kann dann unter einer Wärmedämmhaube erfolgen, um den Temperaturverlust zu mindern und um gleichmäßigere Materialeigenschaften zu gewährleisten.At higher winding temperatures, a fast coil transport to the subsequent 2nd process stage is advantageous to save heating energy when starting. The transport of the coils can then be done under a heat-insulating hood to reduce the loss of temperature and to ensure more uniform material properties.

2. Verfahrensstufe:2nd stage of the process:

  • Abwickeln des Coils,Unwinding the coil,
  • Bei Unplanheiten optionales Richten des Bandes in einer Richtmaschine;In case of unevenness, optional straightening of the strip in a straightening machine;
  • Optionales Ausgleichen der Bandtemperatur durch zonales Kühlen oder Aufheizen vor der eigentlichen Anlassbehandlung zur Vergleichmäßigung der Bandtemperatur über der Bandlänge und -breite;Optionally balancing the strip temperature by zone cooling or heating prior to the actual tempering treatment to even out the strip temperature over the strip length and width;
  • Anlassen des Bandes, d. h. kontinuierliches Wiedererwärmen mit einer Induktionsheizung oder energetisch vorteilhaft in einem gasbeheizten Durchlaufofen (z. B. Oxyfuel-Ofen mit dem sog. DFI-Verfahren);Starting the tape, d. H. continuous reheating with an induction heating or energetically advantageous in a gas-heated continuous furnace (eg oxy-fuel furnace with the so-called DFI method);
  • Besäumen des Bandes;Trimming the ribbon;
  • Anschließendes Abkühlen des Bandes;Subsequent cooling of the tape;
  • Erneutes Richten des Bandes;Redirecting the tape;
  • Erneutes Aufwickeln des Bandes zu einem Coil.Rewinding the tape into a coil.

Alternativ können die Bänder vor dem Ofen, hinter dem Ofen und/oder unmittelbar vor der Plattenabschiebeeinheit zu Tafeln geschnitten werden. Das Schneiden von Tafeln ist besonders vorteilhaft bei schwierig aufzuwickelnden Bändern. Das Schneiden bei Anlasstemperatur ist vorteilhaft, da das Band dort eine niedrigere Festigkeit hat.Alternatively, the bands can be cut into sheets in front of the oven, behind the oven and / or immediately before the sheet removal unit. The cutting of panels is particularly advantageous in difficult to be wound tapes. Cutting at tempering temperature is advantageous because the strip has a lower strength there.

Bei dickeren Bändern und/oder hochfesten Stählen, die nicht mehr geschnitten werden können, ist eine Brennschneidemaschine, eine Laserschneidmaschine oder eine thermische Schneidemaschine zum Schneiden vorgesehen.For thicker strips and / or high strength steels that can no longer be cut, a flame cutting machine, a laser cutting machine or a thermal cutting machine is provided for cutting.

Bei dem genannten Oxyfuel-Ofen, in dem das so genannte DFI-Oxyfuel-Verfahren (direkte Flammenbeaufschlagung) zum Anlassen durchgeführt wird, handelt es sich um einen speziellen Ofen, bei dem (fast) reiner Sauerstoff statt Luft und gasförmiger oder flüssiger Brennstoff gemischt und die daraus entstehende Flamme direkt auf das Band gerichtet wird. Dies optimiert nicht nur den Brennvorgang, sondern reduziert auch die Stickstoffoxid-Emissionen. Die Zundereigenschaften sind ebenfalls günstig bzw. das Zunderwachstum ist dabei sehr gering (betreiben mit Luftunterschuss). Die hohe Strömungsgeschwindigkeit der Gase hat sogar eine reinigende Wirkung auf die Bandoberfläche. Bezüglich der Bandoberflächenqualität ist diese Erwärmungsart besonders vorteilhaft. Mit diesem Verfahren lassen sich ähnlich hohe Wärmedichten bei gutem Wirkungsgrad erzielen, wie bei der induktiven Heizung.This is the oxyfuel furnace in which the so-called DFI oxyfuel process (direct flame application) is carried out for tempering It is a special furnace where (almost) pure oxygen instead of air and gaseous or liquid fuel are mixed and the resulting flame is aimed directly at the belt. This not only optimizes the firing process, but also reduces nitrogen oxide emissions. The scaling properties are also favorable or the growth of scale is very low (operate with low air). The high flow rate of the gases even has a cleaning effect on the strip surface. With regard to strip surface quality, this type of heating is particularly advantageous. With this method similar high heat densities can be achieved with good efficiency, as in inductive heating.

Statt einer hintereinander angeordneten Kühlstrecke und Inline-Richtmaschine in der 1. oder 2. Verfahrensstufe kann die Richtmaschine und die Bandkühlung auch in einem Aggregat kombiniert untergebracht sein. Die Richtrollen dienen dann gleichzeitig als Wasserabquetschrollen und sorgen so für eine möglichst gleichmäßige Kühlwirkung über der Breite des Bandes, weil eventuelle Bandquerkrümmungen und Unplanheiten direkt bei der Entstehung beseitigt werden. Die Anstellung der Richtrollen erfolgt individuell abhängig von der Bandtemperatur und der Materialgüte mit Unterstützung eines Richtmaschinenmodells, so dass Überdehnungen der Bandoberfläche vermieden werden. Treiber vor und hinter der Kühlstreckeinheit sorgen möglichst lange für Bandzug, auch wenn der Gerüst- oder der Haspelzug nicht aufgebaut ist. Ein Teil der Bandkühlung kann in Form einer Bandzonenkühlung ausgeführt sein, um die Temperaturverteilung aktiv beeinflussen zu können. Die Kühl-Richt-Einheit ist in den Figuren 1 und 2 angedeutet. Details hierzu gehen aus Fig. 4 hervor. In dieser Figur sind mögliche beliebige Kombinationen für Richten, Kühlen und Abquetschen zu sehen. Für den sicheren Einfädelprozess des Bandkopfes ist besonders bei dünnerem Band die Kühl-Richt-Einheit heb- und schwenkbar ausgeführt, was auch in Fig. 4 angedeutet ist (s. Doppelpfeil). Die Richtrollen sind individuell einstellbar.Instead of a consecutively arranged cooling section and inline straightening machine in the 1st or 2nd process stage, the straightening machine and the belt cooling can also be accommodated in a combined unit. The straightening rollers are then used simultaneously as water squeezing rollers and thus ensure as uniform a cooling effect as possible over the width of the belt, because possible transverse strains and unevenness are eliminated directly during formation. The adjustment of the straightening rollers is done individually depending on the belt temperature and the material quality with the support of a straightening machine model, so that overstretching of the belt surface can be avoided. Drivers in front of and behind the cooling drafting unit ensure that the strip pulls as long as possible, even if the scaffolding or the coiler has not been erected. Part of the strip cooling may be in the form of a strip zone cooling in order to be able to actively influence the temperature distribution. The cooling-straightening unit is in the FIGS. 1 and 2 indicated. Details on this go out Fig. 4 out. In this figure, any possible combinations for straightening, cooling and squeezing can be seen. For the safe threading process of the tape head, the cooling-straightening unit is designed to be raised and swiveled, especially in thinner tape, which also in Fig. 4 is indicated (see double arrow). The straightening rollers are individually adjustable.

Vor und/oder hinter der in Fig. 4 zu sehenden gemeinsamen Anordnung von Richtmaschine und Kühlung kann ein Temperaturscanner für das Band vorgesehen werden. Vor der dargestellten Anlage kann ein Bandkopfformdetektor (zur Detektion eines Skis oder von Wellen) positioniert sein.Before and / or behind the in Fig. 4 see joint arrangement of straightener and cooling a temperature scanner for the band can be provided. In front of the illustrated system, a tape head shape detector (for detecting a ski or waves) may be positioned.

Im einzelnen zu erkennen sind in Fig. 4 Treiber 24, eine reine Kühleinheiten 25, Richtrollen 26 und kombinierte Abquetschrollen / Treiber 27. Ferner sind Düsen der Intensivkühlung 28 zu sehen.In detail to be recognized in Fig. 4 Driver 24, a pure cooling units 25, straightening rollers 26 and combined pinch rollers / drivers 27. Furthermore, nozzles of the intensive cooling 28 can be seen.

Es ist dabei eine abwechselnde Anordnung von Kühl-, Richt- und Treibrolleneinheiten möglich. Der Richtbetrag wird abhängig von dem Material des Bandes und der Temperatur individuell eingestellt. Die Richt-Kühl-Einheit ist heb- und schwenkbar.It is an alternate arrangement of cooling, straightening and driving roller units possible. The directing amount is set individually depending on the material of the tape and the temperature. The straightening and cooling unit can be lifted and swiveled.

Wie in Fig. 5 gesehen werden kann, kann auch der Richt- und Heizprozess 14, 16 der 2. Verfahrensstufe kombiniert mit der dargestellten Anlage gefahren werden. Analog kann der Richtbetrag angepasst an die vorhandene Bandtemperatur und das Bandmaterial erfolgen. Dabei wirkt sich der Skineffekt (höhere Oberflächentemperatur) der Induktionsheizung (oder eine direkte Flammenbeaufschlagung beim DFI-Oxyfuel-Verfahren) positiv aus. Gleichzeitig halten die Richtrollen das Band auf Position und vermeiden Unplanheiten, so dass eine möglichst effiziente (induktive) Aufheizung im langen Filetteil des Bandes möglich ist. Treiber 29 vor und hinter der Heiz-Richt-Einheit halten das Band unter Zugspannung 30. Für das sichere Einfädeln des Bandkopfes sind die Induktionsspulen 32 sowie Richt- und Überleitrollen 31 vertikal anstellbar ausgeführt.As in Fig. 5 can be seen, also the straightening and heating process 14, 16 of the second process stage combined with the system shown can be driven. Similarly, the indicative amount can be adjusted to the existing strip temperature and the strip material. The effect of the skin effect (higher surface temperature) of the induction heating (or a direct application of flame in the DFI oxyfuel process) has a positive effect. At the same time, the straightening rollers keep the belt in position and avoid unevenness, so that the most efficient (inductive) heating in the long filet part of the belt is possible. Driver 29 in front of and behind the heating-straightening unit keep the tape under tensile stress 30. For the safe threading of the tape head, the induction coils 32 and straightening and transfer rollers 31 are designed to be vertically adjustable.

Der Einsatz der Kühl-Richt-Einheit (Fig. 4) bzw. der Heiz-Richt-Einheit (Fig. 5) ist nicht auf eine Bandanlage beschränkt, sondern kann auch bei einer Grobblechanlage vorgesehen werden.The use of the cooling-straightening unit ( Fig. 4 ) or the heating-straightening unit ( Fig. 5 ) is not limited to a belt system, but can also be provided in a heavy plate plant.

Vor und/oder hinter der in Fig. 5 zu sehenden gemeinsamen Anordnung von Richtmaschine und Heizung kann ein Temperaturscanner für das Band vorgesehen werden.Before and / or behind the in Fig. 5 To see common arrangement of leveler and heater, a temperature scanner for the band can be provided.

Um die Temperaturverteilung über der Bandbreite in der 2. Verfahrensstufe bei der induktiven Erwärmung beeinflussen zu können, werden u. a. Querfeldinduktoren eingesetzt, die sich quer zur Bandlaufrichtung bzw. förderrichtung F verschieben lassen. Hiermit können - falls erforderlich - beispielsweise die Bandränder stärker erhitzt oder weniger intensiv erwärmt werden.In order to influence the temperature distribution over the bandwidth in the 2nd stage of the process of inductive heating, u. a. Querfeldinduktoren used, which can be moved transversely to the direction of tape travel or conveying direction F. Hereby, if necessary, for example, the band edges are heated more or heated less intense.

Optional kann vor dem Aufheizen des Bandes auf Anlasstemperatur ein Ausgleichen der Bandtemperatur über die Länge und die Breite des Bandes durch gezieltes Kühlen (Zonenkühlung) oder Erwärmen zu warmer oder zu kalter Bandabschnitte erfolgen. Dies ist insbesondere vorzusehen, wenn nicht gänzlich auf Umgebungstemperatur abgekühlte Coils behandelt werde sollen. Hierdurch kann der Durchlauf der Coils durch das Coillager verkürzt werden. Ein Coilverfolgungssystem (Modell) sowie die gemessenen Temperaturverteilungen beim Abwickeln des Coils werden zur optimalen Steuerung der Heiz- oder Kühlaggregate herangezogen.Optionally, prior to heating the belt to tempering temperature, balancing the belt temperature across the length and width of the belt may be accomplished by selective cooling (zone cooling) or heating to warm or cold belt sections. This should be provided in particular, if not completely cooled to ambient temperature coils should be treated. As a result, the passage of the coils can be shortened by the Coillager. A coil tracking system (model) and the measured temperature distributions during unwinding of the coil are used to optimally control the heating or cooling units.

Für die Richtrollen werden auftragsgeschweißte hoch-verschleißfeste Rollenmaterialien eingesetzt, um eine lange Standzeit und eine gute Bandqualität zu gewährleisten.For the straightening rollers, job-welded high-wear roller materials are used to ensure a long service life and good strip quality.

Temperaturscanner und Planheitsmessgeräte innerhalb der Linie überwachen indirekt die Qualität des Bandes und dienen als Signal für Stell- und Regelglieder, wie z. B. für die Durchlaufgeschwindigkeit, die Heizleistung, die Richtrollenanstellung und die Kühlung, die durch ein Prozessmodell gesteuert werden.Temperature scanners and flatness measuring devices within the line indirectly monitor the quality of the strip and serve as a signal for actuators and control elements, such. For example, for the flow rate, the heating power, the straightening roller adjustment and the cooling, which are controlled by a process model.

In Fig. 6 ist die erste Verfahrensstufe in einer etwas modifizierten Ausführungsform dargestellt. Analog zu Fig. 1 zeigt Fig. 6 den hinteren Teil der Fertigstraße 7, laminare Bandkühleinheiten 9, 10 sowie eine Intensivkühlung 11 und die Aufhaspelstationen 3. In dieser Ausführungsform sind die Intensivkühlung 11 und eine Bandrichteinheit 36.1, 36.2 an verschiedenen Stellen angeordnet. Vor und hinter der Intensivkühlung 11 sind Treiber 34 und 35 positioniert. Hiermit lässt sich innerhalb der Intensivkühlung 11 fast für die gesamte Bandlänge ein Bandzug aufrecht halten, ohne dass das Band im Gerüst oder Haspelanlage eingespannt ist. Damit werden eventuell auftretende Bandwellen herausgezogen und so eine möglichst gleichmäßige Kühlwirkung erzielt.In Fig. 6 the first process step is shown in a somewhat modified embodiment. Analogous to Fig. 1 shows Fig. 6 the rear part of the finishing train 7, laminar belt cooling units 9, 10 and an intensive cooling 11 and the Aufhaspelstationen 3. In this embodiment, the intensive cooling 11 and a band straightening unit 36.1, 36.2 are arranged at different locations. Before and behind the intensive cooling 11 drivers 34 and 35 are positioned. This makes it possible to maintain a strip tension within the intensive cooling 11 almost for the entire strip length, without the strip being clamped in the frame or coiler. This will be pulled out possibly occurring tape shafts, thus achieving the most uniform cooling effect.

Um ein zentrisches Einlaufen des Bandes in den Treiber 34, 35 oder/und in die Intensivkühlung 11 zu gewährleisten, ist besonders vorteilhaft eine Bandseitenführung 33.1 davor angeordnet. Nachdem der Bandkopf den Treiber 33.1 sowie die Intensivkühlung 11 passiert hat, wird die Seitenführung 33.1 wieder geöffnet, damit der Wasserabfluss in der laminaren Bandkühlung 10 nicht behindert wird. Die Führungsaufgabe übernimmt dann für den Rest des Bandes die Führung 33.2. Analog wird für das Bandende die Führung 33.1 wieder kurz angestellt, nachdem das Ende die Fertigstraße verlassen hat, um einem Verlaufen des Bandendes entgegen zu wirken. Um die Kühlstreckenlänge zu minimieren, ist die Seitenführung 33.1 deshalb bevorzugt innerhalb der laminaren Bandkühleinheit 10 angeordnet.In order to ensure a centric running in of the tape in the driver 34, 35 or / and in the intensive cooling 11, a band side guide 33.1 is arranged in front of it in a particularly advantageous manner. After the tape head has passed the driver 33.1 and the intensive cooling 11, the side guide 33.1 is opened again, so that the water flow in the laminar belt cooling 10 is not hindered. The leadership task then takes over the leadership of the rest of the band 33.2. Analogously, the guide 33.1 is briefly made again for the end of the tape after the end has left the finishing line to counteract a running of the tape end. Therefore, in order to minimize the cooling path length, the side guide 33. 1 is preferably arranged within the laminar belt cooling unit 10.

Die Richtrollen 36.1, 36.2 vor der jeweiligen Aufhaspelstationen 3 werden nach Aufbau des Bandzuges in die Bandebene hineingetaucht und sorgen durch die Umschlingung der Boden-, Umlenk- oder Treibrollen für einen Bandrichteffekt. Eine ähnliche Fahrweise wird praktiziert, wenn innerhalb der Intensivkühlstrecke 11 Umlenkrollen 26 (s. Fig. 4) angeordnet sind.The straightening rollers 36.1, 36.2 before each Aufhaspelstationen 3 are immersed in the band level after construction of the strip tension and ensure by wrapping the bottom, deflection or drive rollers for a band straightening effect. A similar mode of operation is practiced if, within the intensive cooling section 11 deflection rollers 26 (s. Fig. 4 ) are arranged.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Band (hinter der Fertigstraße mit Enddicke)Band (behind the finishing train with final thickness)
22
Coilcoil
33
Aufhaspelstationcoiling
44
Abhaspelstationuncoiling
55
Aufhaspelstationcoiling
66
Band (innerhalb der Fertigstraße mit Zwischendicke)Strip (within the finishing mill with intermediate thickness)
77
Fertigstraßefinishing line
88th
Bandkühlungstrip cooling
99
intensive laminare Bandkühlungintensive laminar band cooling
1010
laminare Bandkühlunglaminar band cooling
1111
Intensivkühlungintensive cooling
1212
Haspelreel
1313
Haspelreel
1414
Richtmaschinestraightener
1515
ZoneZone
1616
Ofenoven
1717
Besäumscheretrimming shears
1818
Scherescissors
1919
Luftkühlung oder laminare BandkühlungAir cooling or laminar belt cooling
2020
Richtmaschinestraightener
2121
Plattenabschiebeeinheitplate pushing
2222
Haspelreel
2323
Haspelreel
2424
Treiberdriver
2525
reine Kühleinheitpure cooling unit
2626
Richtrollestraightening roller
2727
Abquetschrolle / TreiberSqueezing roller / driver
2828
Düsen der IntensivkühlungNozzles of intensive cooling
2929
Treiberdriver
3030
Zugspannungtension
3131
ÜberleitrolleÜberleitrolle
3232
Induktionsspuleinduction coil
33.133.1
Seitenführung vor dem ersten Treiber / vor der IntensivkühlungSide guide before the first driver / before the intensive cooling
33.233.2
Seitenführung vor dem HaspeltreiberSide guide in front of the reel driver
3434
Treiber vor der IntensivkühlungDriver before the intensive cooling
3535
Treiber hinter der IntensivkühlungDriver behind the intensive cooling
36.136.1
Richtrolle vor der ersten AufwickelstationStraightening roller before the first winding station
36.236.2
Richtrolle vor der zweiten AufwickelstationStraightening roller in front of the second winding station
I.I.
1. Verfahrensstufe1st stage of the process
II.II.
2. Verfahrensstufe2nd stage of the process
FF
Förderrichtungconveying direction
T0 T 0
Umgebungstemperaturambient temperature

Claims (36)

  1. Method for hot rolling and for heat treatment of a strip (1) of steel, comprising the steps:
    initially performing the following steps a) to d) within the scope of a rolling and cooling process:
    a) heating the slab to be rolled;
    b) rolling the slab to the desired strip thickness;
    c) cooling the strip (1), wherein after the cooling the strip (1) has a temperature above the ambient temperature (To);
    d) coiling the strip (1) into a coil (2);
    subsequently performing the following steps e) to h) within the scope of a tempering process:
    e) uncoiling the strip from the coil (2);
    f) heating the strip (1);
    g) cooling the strip (1) and
    h) transporting the strip (1) away,
    wherein before the heating according to step f) the strip (1) has a temperature above the ambient temperature (T0) and wherein when the step d) is performed the coil (2) is located at a coiling station (3) and that when the step e) is performed the coil (2) is located at an uncoiling station (4) spatially remote from the coiling station (3), wherein the coil (2) is transported from the coiling station (3) to the uncoiling station (4) between steps d) and e) in a thermally insulated manner.
  2. Method according to claim 1, characterised in that step e) of claim 1 directly follows step d) of claim 1.
  3. Method according to claim 1 or 2, characterised in that during cooling or after cooling according to step c) and/or according to step g) of claim 1 the strip (1) is subjected to a straightening process.
  4. Method according to any one of claims 1 to 4, characterised in that between the uncoiling according to step e) of claim 1 and the heating according to step f) of claim 1 the strip (1) is subjected to a straightening process.
  5. Method according to any one of claims 1 to 4, characterised in that between the heating according to step f) of claim 1 and the transport away according to step h) of claim 1 the step (1) is subjected to a straightening process.
  6. Method according to any one of claims 3 to 5, characterised in that the straightening process is effected by deflecting the strip (1) around base, deflecting, driving or other rollers.
  7. Method according to any one of claims 4 to 6, characterised in that the straightening process is carried out by means of a skin-pass stand.
  8. Method according to any one of claims 1 to 7, characterised in that the strip (1) is subjected to a straightening process during the heating according to step f) of claim 1.
  9. Method according to any one of claims 1 to 8, characterised in that the cooling of the strip (1) according to step c) of claim 1 comprises a laminar cooling and intensive coolings.
  10. Method according to any one of claims 1 to 9, characterised in that the cooling of the strip (1) according to step g) of claim 1 comprises a laminar cooling.
  11. Method according to any one of claims 1 to 10, characterised in that the cooling of the strip (1) according to step c) and/or according to step g) of claim 1 takes place zonally over the width of the strip.
  12. Method according to any one of claims 1 to 11, characterised in that the cooling of the strip (1) according to step g) of claim 1 comprises air cooling.
  13. Method according to one of claims 1 to 12, characterised in that the cooling of the strip (1) according to step g) of claim 1 is carried by means of a high-pressure bar so that cleaning and/or descaling of the strip takes or take place at the same time.
  14. Method according to any one of claims 1 to 13, characterised in that the heating of the strip (1) according to step f) of claim 1 comprises inductive heating.
  15. Method according to claim 14, characterised in that the inductive heating of the strip (1) takes place in an inert gas atmosphere.
  16. Method according to any one of claim 1 to 13, characterised in that the heating of the strip (1) according to step f) of claim 1 is effected by direct flame action on the strip.
  17. Method according to claim 16, characterised in that the direct flame action on the strip (1) is effected by a gas jet comprising at least 75% oxygen in which a gaseous or liquid fuel is mixed.
  18. Method according to claim 17, characterised in that the direct flame action is effected by a gas jet comprising pure oxygen.
  19. Method according to any one of claims 1 to 18, characterised in that the transport away of the strip (1) according to step h) of claim 1 comprises coiling the strip (1).
  20. Method according to any one of claims 1 to 18, characterised in that the transport away of the strip (1) according to step h) of claim 1 comprises pushing off plate-like cut portions of the strip (1).
  21. Method according to any one of claims 1 to 20, characterised in that before the cooling according to step c) of claim 1 the strip (1) has a temperature of at least 750° C.
  22. Method according to any one of claims 1 to 21, characterised in that the cooling according to step c) of claim 1 and before coiling according to step d) of claim 1 the strip (1) has a temperature of at least 25° C and at most 400° C, preferably between 100° C and 300° C.
  23. Method according to any one of claims 1 to 22, characterised in that after the heating according to step f) of claim 1, the strip (1) has a temperature of at least 400° C, preferably between 400° C and 700° C.
  24. Method according to any one of claims 1 to 23, characterised in that the heating of the strip (1) according to step f) of claim 1 is carried out in such a manner that the strip has different temperatures over its width.
  25. Method according to any one of claims 1 to 24, characterised in that after the cooling according to step g) of claim 1 and before transport away according to step h) of claim 1 the strip (1) has a temperature of at most 200° C, preferably between 25° C and 200° C.
  26. Method according to any one of claims 1 to 25, characterised in that the steps e) to g) of claim 1 are carried out in reversing operation, for which purpose a coiling station (5) located behind the cooling according to step g) of claim 1 is used.
  27. Method according to any one of claims 1 to 26, characterised in that the flatness of the strip (1) and/or the temperature of the strip (1) is or are measured at at least two locations in the strip treatment plant for monitoring the quality of the strip (1).
  28. Method according to any one of claims 1 to 27, characterised in that the transit speed of the strip through the strip treatment plant, the in particular, zone-related strip heating, the adjustment of the straightening rolls and/or the, in particular, zone-related cooling are controlled or regulated by a process model.
  29. Method according to any one of claims 1 to 28, characterised in that during passage through the strip treatment plant the strip (1) is held under a defined strip tension at least in sections by means of drivers.
  30. Method according to any one of claims 1 to 29, characterised in that a strip tension is built up by means of drivers (34, 35) before and after the cooling of the strip (1).
  31. Method according to any one of claims 1 to 30, characterised in that a strip (1) is guided transversely to its longitudinal axis by means of a lateral guidance (33.1, 33.2).
  32. Method according to claim 31, characterised in that the lateral guidance (33.1, 33.2) takes place in the region of the cooling of the strip (1).
  33. Method according to claim 32, characterised in that the lateral guidance (33.1, 33.2) takes place in the region of the laminar cooling of the strip (1).
  34. Method according to claim 30 and any one of claims 31 to 33, characterised in that the lateral guidance (33.1, 33.2) of the strip (1) takes place in front of the driver (34, 35) and opens after passing the strip head and closes at the strip end.
  35. Method according to any one of claims 1 to 34, characterised in that a measurement of the strip temperature is carried out by means of a low-temperature radiation pyrometer.
  36. Method according to any one of claims 1 to 35, characterised in that a measurement of the strip temperature is carried out in front of, within and/or behind the cooling and/or heating devices.
EP08758994A 2007-06-22 2008-06-04 Process for hot rolling and for heat treatment of a steel strip Active EP2162557B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200830299T SI2162557T1 (en) 2007-06-22 2008-06-04 Process for hot rolling and for heat treatment of a steel strip
PL08758994T PL2162557T3 (en) 2007-06-22 2008-06-04 Process for hot rolling and for heat treatment of a steel strip

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007029280 2007-06-22
DE102008010062A DE102008010062A1 (en) 2007-06-22 2008-02-20 Process for hot rolling and heat treatment of a strip of steel
PCT/EP2008/004435 WO2009000387A1 (en) 2007-06-22 2008-06-04 Process for hot rolling and for heat treatment of a steel strip

Publications (2)

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EP2162557A1 EP2162557A1 (en) 2010-03-17
EP2162557B1 true EP2162557B1 (en) 2011-04-06

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EP (1) EP2162557B1 (en)
JP (1) JP5485147B2 (en)
KR (1) KR101153732B1 (en)
CN (1) CN101755058B (en)
AR (1) AR067091A1 (en)
AT (1) ATE504665T1 (en)
AU (1) AU2008267505B2 (en)
BR (1) BRPI0812324A2 (en)
CA (1) CA2686377C (en)
DE (2) DE102008010062A1 (en)
DK (1) DK2162557T3 (en)
EG (1) EG25307A (en)
ES (1) ES2362052T3 (en)
MX (1) MX2009013530A (en)
MY (1) MY148425A (en)
PL (1) PL2162557T3 (en)
RU (1) RU2429922C1 (en)
SI (1) SI2162557T1 (en)
TW (1) TWI412410B (en)
UA (1) UA98653C2 (en)
WO (1) WO2009000387A1 (en)
ZA (1) ZA200907733B (en)

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RU2010101900A (en) 2011-07-27
ES2362052T3 (en) 2011-06-27
TW200914157A (en) 2009-04-01
PL2162557T3 (en) 2011-09-30
MX2009013530A (en) 2010-01-27
UA98653C2 (en) 2012-06-11
EP2162557A1 (en) 2010-03-17
US20100175452A1 (en) 2010-07-15
ATE504665T1 (en) 2011-04-15
CA2686377A1 (en) 2008-12-31
TWI412410B (en) 2013-10-21
DE102008010062A1 (en) 2008-12-24
AR067091A1 (en) 2009-09-30
CN101755058B (en) 2011-11-09
SI2162557T1 (en) 2011-08-31
BRPI0812324A2 (en) 2014-11-25
MY148425A (en) 2013-04-30
AU2008267505A1 (en) 2008-12-31
DK2162557T3 (en) 2011-07-11
RU2429922C1 (en) 2011-09-27
AU2008267505B2 (en) 2010-11-25
EG25307A (en) 2011-12-07
DE502008003118D1 (en) 2011-05-19
JP5485147B2 (en) 2014-05-07
CA2686377C (en) 2011-09-27
KR20100007940A (en) 2010-01-22
ZA200907733B (en) 2010-06-30
JP2010530807A (en) 2010-09-16
CN101755058A (en) 2010-06-23
WO2009000387A1 (en) 2008-12-31
KR101153732B1 (en) 2012-06-14

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