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US20100175452A1 - Method for hot rolling and for heat treatment of a steel strip - Google Patents

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

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Publication number
US20100175452A1
US20100175452A1 US12/602,277 US60227708A US2010175452A1 US 20100175452 A1 US20100175452 A1 US 20100175452A1 US 60227708 A US60227708 A US 60227708A US 2010175452 A1 US2010175452 A1 US 2010175452A1
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United States
Prior art keywords
strip
cooling
heating
temperature
straightening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/602,277
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English (en)
Inventor
Joachim Ohlert
Ingo Schuster
Peter Sudau
Juergen Seidel
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SMS Siemag AG
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Individual
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Filing date
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Assigned to SMS SIEMAG AKTIENGESELLSCHAFT reassignment SMS SIEMAG AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUDAU, PETER, SCHUSTER, INGO, OHLERT, JOACHIM, SEIDEL, JUERGEN
Publication of US20100175452A1 publication Critical patent/US20100175452A1/en
Abandoned legal-status Critical Current

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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 treatment of a strip of steel.
  • the demand for types of steel having very high strength is also increasing continuously in strip production, i.e. the demand for so-called high-strength and ultrahigh strength steels.
  • These materials are used, inter alia, in motor vehicles, cranes, containers and in pipes.
  • the strip has a temperature above the ambient temperature.
  • the coil when carrying out step d) the coil is located at a coiling station wherein, when carrying out step e) the coil is preferably located at an uncoiling station spatially remote from the coiling station and wherein the coil is transported from the coiling station to the uncoiling station between steps d) and e) in a thermally insulated manner, possibly via a heat-insulating coil store.
  • Step e) can directly follow step d).
  • the strip can be subjected to a straightening process. It can also be subjected to a straightening process between the uncoiling according to step e) and the heating according to step f). It can also be subjected to a straightening process between the heating according to step f) and the removal according to step h). Said straightening process can be effected by deflecting the strip around base, deflecting, driving or other rollers.
  • the straightening process is usually carried out by means of a roller straightening machine or screwed-down strip deflecting rollers or, according to a special embodiment of the invention, on a so-called skin-pass frame.
  • the strip can also be subjected to a straightening process during the heating according to above step f).
  • the cooling of the strip according to step c) can comprise a laminar cooling and downstream intensive cooling.
  • the cooling of the strip according to step g) can also comprise a laminar cooling or alternatively or additively air cooling.
  • At least parts of the cooling device can be configured as zone cooling which acts in zones over the width of the strip.
  • the cooling of the strip can also be carried out by means of a high-pressure bar so that cleaning and/or descaling of the strip is possible at the same time.
  • the heating of the strip according to step f) can comprise inductive heating.
  • direct flame impingement of the strip can be effected.
  • the direct flame impingement of the strip is effected by a gas jet comprising at least 75% oxygen, preferably comprising almost pure oxygen, in which a gaseous or liquid fuel is mixed.
  • a further development provides that the inductive heating of the strip takes place in inert gas (protective gas).
  • the removal of the strip according to step h) can comprise coiling the strip.
  • the removal of the strip according to step h) according to claim 1 can also comprise pushing off plate-like cut portions of the strip.
  • the strip Before the cooling according to step c) the strip preferably has a temperature of at least 750° C.
  • the strip After the cooling according to step c) and before coiling according to step d), the strip preferably has a temperature of at least 25° C. and at most 400° C., preferably between 100° C. and 300° C.
  • the strip preferably has a temperature of at least 400° C., preferably between 400° C. and 700° C.
  • the strip can preferably have a temperature of at most 200° C., preferably between 25° C. and 200° C.
  • the heating of the strip can take place at different intensity over the strip width.
  • steps e) to g) are carried out in reversing mode for which a coiling station located after the cooling according to step g) is used.
  • the flatness of the strip and/or the temperature of the strip is measured at least at two locations in the strip treatment installation for monitoring the quality of the strip.
  • the running speed of the strip through the strip treatment installation, the, in particular, zone-related strip heating, the adjustment of the straightening rolls and/or the in particular zone-related cooling can be controlled or regulated by a process model.
  • the strip can be held under a defined strip tension at least in sections by means of drivers. This applies particularly in the area of the intensive cooling section.
  • a strip lateral guide is preferably located in front thereof.
  • the strip has a temperature above the ambient temperature.
  • process steps a) to d) can be used by themselves alone.
  • a strip tension can be built up by means of drivers before and after the cooling of the strip.
  • the strip can be guided transversely to its longitudinal axis by means of a lateral guidance.
  • the lateral guidance can preferably take place in the area of the cooling of the strip, in particular in the area of the laminar cooling of the strip.
  • the lateral guidance of the strip can furthermore take place before the driver and can open after passing the strip head and close again at the strip end for the purpose of guidance.
  • Measurement of the strip temperature can be made by means of a low-temperature radiation pyrometer.
  • the measurement of the strip temperature can preferably be made before, inside and/or after the cooling and/or heating devices.
  • the production spectrum of a hot wide strip mill differs appreciably from that of a heavy plate mill.
  • a plurality of high-strength and ultrahigh strength types of steel newly developed over the last few decades now exist, whose properties can be adjusted by specific rolling and/or cooling strategies.
  • a suitable method for this is quenching of the strip at a high cooling rate after rolling, followed by re-heating to temperatures above the phase-transformation temperature.
  • thinner, ultrahigh-strength strips having lower temperature and thickness tolerance as well as strip flatness can be produced more reliably on hot strip mills. It is therefore appropriate and advantageous to shift parts of production from heavy plate stands to strip mills.
  • Advantages of the separate arrangement of the rolling and cooling process on the one hand and the tempering process on the other hand are the flexibility of the method (no mixed rolling is necessary), the flexible adjustment of the temperature time profile of the strip and that one's own coils or coils from other installations can be processed. Coils or plates can also be cut depending on the intended use of the strip or the coilability. The plates are preferably cut at higher temperature, i.e. at the tempering temperature.
  • FIG. 1 shows schematically a hot strip mill for producing a steel strip according to a first embodiment of the invention
  • FIG. 2 shows an alternative embodiment of the hot strip mill to FIG. 1 ,
  • FIG. 3 shows an exemplary temperature profile of the strip over the conveying direction of the hot strip mill
  • FIG. 4 shows the fundamental structure of a straightening machine with integrated intensive cooling as a section from the hot strip mill according to FIG. 1 or 2 ,
  • FIG. 5 shows the fundamental structure of a straightening machine with integrated heating as a section from the hot strip mill according to FIG. 1 or 2 ,
  • FIG. 6 shows schematically a hot strip mill with an alternative embodiment of a first process step.
  • FIG. 1 shows a hot strip mill in which a strip 1 is initially processed in a first process stage (given by I) and then in a second process stage (given by II).
  • a slab is first rolled in a multi-stand rolling mill. Of the rolling mill, only the last three finishing stands 7 are shown in which the strip 6 having an intermediate thickness has been rolled. The temperature distribution in the strip or the flatness can then be measured.
  • the strip 1 then passes in the conveying direction F into a strip cooling system 8 which is divided here into an intensive laminar cooling system 9 with so-called edge masking and a laminar strip cooling system 10 .
  • the conveying speed is, for example, 6 m/s.
  • the cooled strip 1 then enters into an intensive cooling system 11 in which, according to a preferred embodiment of the invention, a straightening machine and driver are integrated (details in FIG. 4 ). Drivers can be provided before and after the intensive cooling system 11 .
  • the intensive cooling system 11 can be followed by another measurement of the temperature distribution and the flatness of the strip.
  • a low-temperature radiation pyrometer is preferably used at these low temperatures.
  • a temperature measurement is also feasible inside the intensive cooling system between two squeeze or driver rolls for the purpose of temperature-coolant regulation.
  • the strip 1 is then coiled in a coiling station 3 by a coiler 12 or 13 .
  • the coil 2 then enters the second process stage, i.e. the tempering process.
  • the coil 2 is initially uncoiled in an uncoiling station 4 and then fed to a straightening machine 14 (this can be located before and/or after the following furnace). After a temperature equalization has taken place over the length and width of the strip in a zone 15 , the strip 1 enters into a furnace 16 . It is possible and advantageous to integrate a straightening machine in the furnace 16 similarly to the cooling (details in FIG. 5 ).
  • the strip 1 can be heated in continuous or in reversing mode.
  • An oxyfuel furnace or an induction furnace are preferably used, the heating time being between 10 and 600 seconds.
  • the strip 1 then enters into a laminar strip cooling system or alternatively into an air cooling system 19 . This can be followed by a straightening machine 20 .
  • a plate pushing unit 21 or a coiler 22 in a coiling station 5 are then furthermore indicated in FIG. 1 .
  • a skin-pass stand can also be arranged here instead of a straightening machine 14 or 20 .
  • Coils from other hot strip mills can also be introduced instead of the uncoiling station 4 .
  • FIG. 2 a direct connection of the two process stages I and II can be seen in FIG. 2 (the installation is not shown fully fitted).
  • the last coiler 23 is provided for winding the higher-strength strips. In this case, this can advantageously comprise a special coiler for simple winding of the high-strength steels.
  • the coiler 23 is a so-called transfer coiler.
  • Pivotable pinch rolls hold the strip under tension during turning into the unwinding position. The winding is therefore directly followed by further processing in the tempering line (second process stage). The further transport takes place similarly to the solution according to FIG. 1 .
  • the strip 1 already has a temperature above the ambient temperature To before the heating in the furnace 16 .
  • direct further transport of the strip 1 from the first process stage to the second process stage is provided without intermediate coiling of the strip 1 and/or subsequent reversing from coiler 22 to coiler 23 .
  • the coiler 23 is not used but after the strip end runs out from the roll mill the tempering process is carried out directly at low or initially high and then lower speed.
  • this operating mode is applied to strip independently of the thickness and the speed. Then the coiler 23 is initially not used and the furnace is also not operating. The strip is wound on coiler 22 . The tempering process is then carried out reversingly between coiler 22 and 23 .
  • FIG. 3 A preferred temperature profile for the strip 1 along the strip mill is shown in FIG. 3 in correspondence with FIG. 2 .
  • the cooling at the end of the line is preferably water or air cooling.
  • cooling can also be effected by means of a high-pressure beam. Cleaning or descaling of the strip surface is thereby carried out at the same time.
  • the production quantity of the rolling plant is usually higher than in the tempering process since the rolling speed of the strip is greater than the tempering speed.
  • a so-called mixing rolling operation is therefore possible to optimally utilize the rolling mill. This means that a number of strips is wound on coilers 12 and 13 whilst the further processing of the higher-strength strip takes place in the tempering line.
  • the production of the strip is therefore divided according to the invention substantially into two process stages which will be specified subsequently as an example with further optional steps.
  • edge masking in the first cooling section units and a straightening machine are advantageous.
  • fast coil transport to the subsequent second process stage is advantageous to save heating energy during tempering.
  • the coil can then be transported under a heat insulating hood to reduce the temperature loss and ensure more uniform material properties.
  • the strips can be cut into plates before the furnace, after the furnace and/or directly before the plate pushing unit.
  • the cutting of plates is particularly advantageous in the case of strip which is difficult to wind. Cutting at the tempering temperature is advantageous since the strip has a lower strength there.
  • a flame cutting machine In the case of thicker strip and/or high-strength steels which can no longer be cut, a flame cutting machine, a laser cutting machine or a thermal cutting machine can be provided for cutting.
  • the said oxyfuel furnace in which the so-called DFI oxyfuel method (direct flame impingement) is carried out for tempering comprises a special furnace in which (almost) pure oxygen instead of air and gaseous or liquid fuel are mixed and the resulting flame is directed directly onto the strip.
  • This not only optimizes the combustion process but also reduces the nitrogen oxide emissions.
  • the scale properties are also favorable or the scale growth is very small (operated with air undershooting).
  • the high flow rate of the gases even has a cleaning effect on the strip surface.
  • This type of heating is particularly advantageous with regard to strip surface quality. High heat densities with as good efficiency as in inductive heating can be achieved with this method.
  • the straightening machine and the strip cooling can also be accommodated combined in one unit.
  • the straightening rollers are then at the same time used as water squeeze rollers and thus ensure a cooling effect which is as uniform as possible over the width of the strip since any strip transverse curvature and lack of flatness is eliminated directly it forms.
  • the straightening rollers are adjusted individually depending on the strip temperature and the material quality with the assistance of a straightening machine model so that overstretching of the strip surface is avoided.
  • Drivers before and after the cooling section unit ensure strip tension for as long as possible even when the stand or the coiler tension is not built up.
  • Part of the strip cooling can be carried is out in the form of strip zone cooling in order to be able to actively influence the temperature distribution.
  • the cooling-straightening unit is indicated in FIGS. 1 and 2 . Details on this are deduced from FIG. 4 . Possible arbitrary combinations for straightening, cooling and squeezing can be seen in this figure.
  • the cooling-straightening unit is executed as raisable and pivotable as indicated in FIG. 4 (see double arrow).
  • the straightening rolls are individually adjustable.
  • a temperature scanner for the strip can be provided before and/or after the joint arrangement of straightening machine and cooling which can be seen in FIG. 4 .
  • a strip head form detector (for detecting a ski or waves) can be positioned in front of the installation shown.
  • Drivers 24 , a pure cooler unit 25 , straightening rolls 26 and combined squeeze rolls/drivers 27 can be identified in detail in FIG. 4 . Furthermore, nozzles of intensive cooling system can be seen.
  • the straightening and heating process 14 , 16 of the second process stage can also be combined with the installation shown.
  • the amount of straightening can be adapted to the present strip temperature and the strip material.
  • the skin effect (higher surface temperature) of the induction heating (or a direct flame impingement in the DFI oxyfuel method) has a positive effect.
  • the straightening rolls hold the strip in position and avoid lack of flatness so that (inductive) heating which is as efficient as possible is possible in the long fillet portion of the strip.
  • Drivers 29 before and after the heating-straightening unit hold the strip under tensile stress 30 .
  • the induction coils 32 as well as the straightening and transfer rollers 31 are designed as vertically adjustable.
  • cooling-straightening unit FIG. 4
  • heating-straightening unit FIG. 5
  • a temperature scanner for the strip can be provided before and/or after the joint arrangement of straightening machine and heating which can be seen in FIG. 5 .
  • transverse field inductors are used, inter alia, which can be displaced transversely to the strip running direction or conveying direction F.
  • the strip edges for example can be heated more strongly or heated less intensively.
  • Equalization of the strip temperature over the length and the width of the strip by specific cooling (zone cooling) or heating at warm or cold strip sections can optionally take place before heating the strip to the tempering temperature. This should be provided in particular when coils not completely cooled to ambient temperature are to be handled. By this means the passage of the coil through the coil store can be shortened.
  • a coil tracking system (model) as well as the measured temperature distributions during unwinding of the coil are used for optimum control of the heating or cooling systems.
  • Welded-to-order, high wear-resistant roller materials are used for the straightening rolls in order to ensure a long life and good strip quality.
  • Temperature scanners and flatness meters within the line indirectly monitor the quality of the strip and serve as a signal for adjusting and regulating members such as, for example, for the throughput speed, the heating power, the adjustment of the straightening rolls and the cooling which are controlled by a process model.
  • FIG. 6 shows the first process stage in a somewhat modified embodiment.
  • FIG. 6 shows the rear part of the finishing train 7 , laminar strip cooling units 9 , 10 as well as an intensive cooling system 11 and the coiling stations 3 .
  • the intensive cooling system 11 and a strip straightening unit 36 . 1 , 36 . 2 are located at various positions.
  • Drivers 34 and 35 are located before and after the intensive cooling system 11 .
  • a strip tension can hereby be maintained within the intensive cooling system 11 for almost the entire strip length without the strip being clamped in the stand or coiler system.
  • any strip waves which may occur are pulled out and a cooling effect which is as uniform as possible is achieved.
  • a strip lateral guide 33 . 1 is particularly advantageously located in front thereof.
  • the lateral guide 33 . 1 is opened again so that the water flow in the laminar strip cooling system 10 is not hindered.
  • the guide 33 . 2 then takes over the guiding task for the remainder of the strip.
  • the guide 33 . 1 is briefly adjusted again after the end has left the finishing train to counteract any straying of the strip end.
  • the lateral guide 33 . 1 is therefore preferably located inside the strip cooling unit 10 .
  • the straightening rolls 36 . 1 , 36 . 2 before the respective coiling stations 3 are dipped into the strip plane after building up the strip tension and provide a strip straightening effect by looping around the base, deflecting or drive rollers.
  • deflecting rollers 26 see FIG. 4
  • a similar operating mode is practiced when deflecting rollers 26 (see FIG. 4 ) are located inside the intensive cooling section 11 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
US12/602,277 2007-06-22 2008-06-04 Method for hot rolling and for heat treatment of a steel strip Abandoned US20100175452A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102007029280 2007-06-22
DE102007029280.7 2007-06-22
DE102008010062A DE102008010062A1 (de) 2007-06-22 2008-02-20 Verfahren zum Warmwalzen und zur Wärmebehandlung eines Bandes aus Stahl
DE102008010062.5 2008-02-20
PCT/EP2008/004435 WO2009000387A1 (de) 2007-06-22 2008-06-04 Verfahren zum warmwalzen und zur wärmebehandlung eines bandes aus stahl

Publications (1)

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US20100175452A1 true US20100175452A1 (en) 2010-07-15

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US12/602,277 Abandoned US20100175452A1 (en) 2007-06-22 2008-06-04 Method for hot rolling and for heat treatment of a steel strip

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US (1) US20100175452A1 (es)
EP (1) EP2162557B1 (es)
JP (1) JP5485147B2 (es)
KR (1) KR101153732B1 (es)
CN (1) CN101755058B (es)
AR (1) AR067091A1 (es)
AT (1) ATE504665T1 (es)
AU (1) AU2008267505B2 (es)
BR (1) BRPI0812324A2 (es)
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CN103495850A (zh) * 2013-07-24 2014-01-08 李庆中 一种低残余应力钢带开平工艺
US20140350746A1 (en) * 2011-12-15 2014-11-27 Posco Method and Apparatus for Controlling the Strip Temperature of the Rapid Cooling Section of a Continuous Annealing Line
EP2722112B1 (de) 2012-10-19 2015-06-24 BWG Bergwerk- Und Walzwerk-Maschinenbau GmbH Vorrichtung und Verfahren zur kontinuierlichen Behandlung eines Metallbandes
US20150275326A1 (en) * 2012-10-05 2015-10-01 Linde Aktiengesellschaft Preheating and annealing of cold rolled metal strip
EP2937156A4 (en) * 2012-12-21 2016-05-04 Posco FORM CORRECTION AND ROLLING PROCESS AND FORM CORRECTION DEVICE FOR HIGH-TIGHT STEEL
CN105934288A (zh) * 2014-12-09 2016-09-07 Posco公司 Ahss热轧卷板的热处理方法、利用其的冷轧方法及热处理装置
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US20170298463A1 (en) * 2014-09-30 2017-10-19 Voestalpine Stahl Gmbh Method for producing metal band material with different mechanical properties across the width of the band
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WO2020058244A1 (de) * 2018-09-18 2020-03-26 Voestalpine Stahl Gmbh Verfahren zur herstellung ultrahochfester stahlbleche und stahlblech hierfür
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US20140350746A1 (en) * 2011-12-15 2014-11-27 Posco Method and Apparatus for Controlling the Strip Temperature of the Rapid Cooling Section of a Continuous Annealing Line
US9783867B2 (en) * 2011-12-15 2017-10-10 Posco Method and apparatus for controlling the strip temperature of the rapid cooling section of a continuous annealing line
US20150275326A1 (en) * 2012-10-05 2015-10-01 Linde Aktiengesellschaft Preheating and annealing of cold rolled metal strip
EP2722112B1 (de) 2012-10-19 2015-06-24 BWG Bergwerk- Und Walzwerk-Maschinenbau GmbH Vorrichtung und Verfahren zur kontinuierlichen Behandlung eines Metallbandes
US10415113B2 (en) 2012-10-19 2019-09-17 Bwg Bergwerk-Und Walzwerk-Maschinenbau Gmbh Method and apparatus for continuously treating metal strip
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US10086418B2 (en) 2012-12-21 2018-10-02 Posco Shape-correcting and rolling method and shape-correcting device for high-strength steel
CN103495850A (zh) * 2013-07-24 2014-01-08 李庆中 一种低残余应力钢带开平工艺
US10434552B2 (en) 2013-07-26 2019-10-08 Sms Group Gmbh Method and device for producing a metallic strip in a continuous casting and rolling process
US10710134B2 (en) 2013-11-29 2020-07-14 Sms Group Gmbh Device for increasing the temperature of elongate metallic rolled stock and finishing train for producing and/or working elongate metallic rolled stock
US9725780B2 (en) 2014-06-13 2017-08-08 M3 Steel Tech Modular micro mill and method of manufacturing a steel long product
US10697034B2 (en) 2014-07-22 2020-06-30 Roll Forming Corporation System and method for producing a hardened and tempered structural member
US9850553B2 (en) 2014-07-22 2017-12-26 Roll Forming Corporation System and method for producing a hardened and tempered structural member
US10870139B2 (en) * 2014-08-06 2020-12-22 Primetals Technologies Austria GmbH Adjusting a targeted temperature profile at the strip head and strip base prior to cross-cutting a metal strip
US20170209907A1 (en) * 2014-08-06 2017-07-27 Primetals Technologies Austria GmbH Adjusting a targeted temperature profile at the strip head and strip base prior to cross-cutting a metal strip
US20170298463A1 (en) * 2014-09-30 2017-10-19 Voestalpine Stahl Gmbh Method for producing metal band material with different mechanical properties across the width of the band
EP3231523A4 (en) * 2014-12-09 2018-05-09 Posco Heat treatment method for ahss hot rolled coils, and cold rolling method using same and heat treatment apparatus
CN105934288A (zh) * 2014-12-09 2016-09-07 Posco公司 Ahss热轧卷板的热处理方法、利用其的冷轧方法及热处理装置
US20170247774A1 (en) * 2016-02-26 2017-08-31 GM Global Technology Operations LLC Continuous tailor heat-treated blanks
US11097323B2 (en) * 2017-03-15 2021-08-24 Danieli & C. Officine Meccaniche S.P.A. Combined continuous casting and metal strip hot-rolling plant
WO2020058244A1 (de) * 2018-09-18 2020-03-26 Voestalpine Stahl Gmbh Verfahren zur herstellung ultrahochfester stahlbleche und stahlblech hierfür
US11970753B2 (en) 2018-09-18 2024-04-30 Voestalpine Stahl Gmbh Method of producing ultrahigh-strength steel sheets and steel sheets therefor
CN111254265A (zh) * 2019-12-31 2020-06-09 中冶南方工程技术有限公司 一种改善带钢内应力分布的方法及装置
US20240001418A1 (en) * 2022-07-02 2024-01-04 Shandong Steel Group Rizhao Co., Ltd. Method and device for producing medium-thickness plates with high thickness precision through cvc steckel mill

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