EP1812185B1 - Verfahren zum herstellen eines gegossenen stahlbandes - Google Patents

Verfahren zum herstellen eines gegossenen stahlbandes Download PDF

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Publication number
EP1812185B1
EP1812185B1 EP05787257A EP05787257A EP1812185B1 EP 1812185 B1 EP1812185 B1 EP 1812185B1 EP 05787257 A EP05787257 A EP 05787257A EP 05787257 A EP05787257 A EP 05787257A EP 1812185 B1 EP1812185 B1 EP 1812185B1
Authority
EP
European Patent Office
Prior art keywords
strip
casting
transport
steel strip
cast steel
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.)
Not-in-force
Application number
EP05787257A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1812185A1 (de
Inventor
Gerald Hohenbichler
Gerald Eckerstorfer
Michael Zahedi
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.)
Primetals Technologies Austria GmbH
Original Assignee
Siemens VAI Metals Technologies GmbH and Co
Siemens VAI Metals Technologies GmbH Austria
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens VAI Metals Technologies GmbH and Co, Siemens VAI Metals Technologies GmbH Austria filed Critical Siemens VAI Metals Technologies GmbH and Co
Publication of EP1812185A1 publication Critical patent/EP1812185A1/de
Application granted granted Critical
Publication of EP1812185B1 publication Critical patent/EP1812185B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0677—Accessories therefor for guiding, supporting or tensioning the casting belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting

Definitions

  • the invention relates to a method for producing a cast steel strip of a preferably H exertrisshaveen or hot brittle steel quality with a strip casting, and a strip casting plant for performing this method.
  • the strip caster is preferably a two-roll caster with two casting rolls arranged with their axes of rotation in a horizontal plane.
  • the cast strip is pressed against one of the roll surfaces by means of gas jet pressure.
  • the casting roll leading the cast strip is always associated with a pressure roll or a driving roll with which the strip is pressed against the casting roll and moved in close contact with the casting roll by applying a strip tension. If necessary, the strip tension also acts here as far back as the banding cross section and also promotes hot cracking.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to propose a method for producing a cast steel strip of a preferably H exertrissaten steel quality and a strip casting plant for implementing this method, wherein the cast steel strip from Band Ésquerrough down to the substantially horizontal transport device largely free from acting on the steel strip Bandanpress- or strip deformation forces (eg by thickness reductions, driver) is performed.
  • This object is achieved by a method of the type described above in that the cast steel strip is guided during its transport movement along the lateral surface of one of the two casting rolls without local application of contact forces or the band thickness influencing deformation forces in a transport channel and in this transport channel a strip cooling in a range of 15 K / s to 200 K / s, and that a strip tension in the region of the lower vertex of the casting roll is set to a value at which the steel strip on the casting roll abuts substantially slip-free over substantially the entire quarter circle arc.
  • the most favorable belt cooling speed is in a range of 15 K / s to 100 K / s.
  • a particularly gentle tape guide is achieved when the cast steel strip is guided in contact with the contact surface of one of the two casting rolls from a vertical casting direction in a substantially horizontal transport direction.
  • the cast steel strip be moved along one of the shell surfaces of the casting rolls in an atmosphere opposite to air during its transport movement reduced oxygen content or in a largely oxygen-free inert gas atmosphere is performed.
  • the oxygen content of the atmosphere is adjusted to less than 8% oxygen, preferably to less than 1% oxygen.
  • the cast steel strip after passing through the transport channel and the translational Wegbelie from the lateral surface of the casting roll over a distance of at least 1 m, preferably more than 2 m, is guided substantially horizontally on a transport device.
  • band tensile forces from the weight forces of a downstream sling, a belt driver or reaction forces from a rolling stand against the belt transport direction are steadily reduced, so that the steel belt leaves the transport channel in the region of the lower vertex of the casting roll largely free of unwanted extraneous stresses.
  • the cast steel strip after a substantially horizontal transport movement forms a belt loop and from this belt loop, a retro-acting strip tension is introduced into the cast steel strip.
  • a stable tape guide from the band forming cross section to the belt loop and on the other hand a decoupling of the casting process of treatment steps in downstream belt treatment facilities is achieved.
  • a strip tension in the cast steel strip preferably in a region of the lower vertex of the casting roll, controlled or regulated by the weight of the belt loop.
  • the dead weight of the belt loop is determined by a position measurement of the belt loop and used as a control variable.
  • the strip tension in the cast steel strip preferably in a region of the lower apex of the casting roll, can be selectively influenced by influencing the friction and velocity relationships between the steel strip and the transport device.
  • this can be achieved by introducing on the cast steel strip during a substantially horizontal transport movement on a belt transport means by applying a clamping force to the casting roll back-acting tape tension or tape compressive stresses in the steel strip and this clamping force along a path portion lying in the transport direction of the steel strip end the transport is applied.
  • the strip tension in the cast steel strip is adjusted by applying the Kemmkraft and used as a control variable. An interaction of several control variables is possible.
  • Particularly stable conditions in the tape guide can be achieved if the strip tension is set in the region of the lower vertex of the casting roll to a value at which the steel strip rests on the casting roll substantially slip-free over substantially the entire quarter circle.
  • the strip tension in the lower vertex should in this case be kept so low that only a band flutter is prevented in the transport channel, but beyond no significant additional Bandzug technique should work back into the Band Struktursquerites.
  • the average band cross-section temperature at the end of a first substantially horizontal transport movement of the metal strip is 60 ° C to 250 ° C lower than in Banding cross section, that is, the range of hot brittleness is at this point already substantially exceeded or overcome.
  • this substantially horizontal transport movement of the steel strip may include deviations of +/- 15 ° to the horizontal.
  • the cast steel strip is subjected before winding in the band reel an at least one-stage reduction in strip thickness in an in-line rolling process.
  • a cold strip preferably in opposite direction to the tape transport direction of the cast strip, introduced into the strip casting, which closes the Band Struktursquerrough between the casting rolls and which in the tape transport direction up to a tape transporting means on a substantially horizontal aligned transport device or extends over the loop pit where it is separated from the cast steel strip, preferably with a dividing shear.
  • a strip casting plant for producing a cast steel strip of predetermined strip thickness of a preferably hot crack-sensitive or hot-brittle steel grade.
  • This strip casting plant consists of two rotationally driven casting rolls with internally cooled lateral surfaces and two side plates which can be pressed and set against the casting roll faces and together form a melting space for receiving molten steel and a strip forming cross section for the steel strip to be cast, a substantially horizontally oriented conveying device for the one in one Transport channel along one of the lateral surfaces of the vertical casting direction in a substantially horizontal transport direction deflected steel strip and a downstream Bandhaspel shark, wherein one of the two casting rolls is associated with a tape guide means which forms a transport channel for the cast steel strip with the lateral surface of this casting roll and the two cooperating casting rolls are equipped with independently controllable internal cooling devices.
  • the strip casting is characterized by the characterizing features of claim 14.
  • the tape guide device is assigned to one of the two casting rolls between the strip forming section and the transport device and support elements of the strip guiding device are arranged correspondingly and depending on the strip thickness at substantially equidistant distance from the lateral surface of the casting roll and form a transport channel for the casting surface with the lateral surface of a casting roll cast steel band.
  • the tape guide device with its associated support elements together with the lateral surface of the casting roll a transport channel for the cast, still hot steel strip and is designed so that the steel strip is not hindered on its way through the transport channel, ie not by any contact with elements of the tape guide device is braked and no relevant, acting loads, such as pressure forces of leadership or even driver roles or friction forces of braking components, is exposed.
  • the steel strip can make a light, close contact with the surface of the casting roll, so that a sufficient cooling of the steel strip is achieved by contact heat transfer.
  • the clear width of the transport channel is thus slightly larger than the thickness of the cast steel strip. Due to the different thermal load of the two cooperating casting rolls they are equipped with separate controlled coolant circuits. Thus, substantially the same thermal conditions for the formation of equally thick strand shells are achieved at both G confusewalzenmänteln.
  • the transport channel for the cast steel strip is disposed within an isolation chamber to maintain a predetermined atmosphere.
  • the transport channel for the cast steel strip is disposed within an isolation chamber to maintain a predetermined atmosphere.
  • a structurally simple solution is obtained if the transport channel for the cast steel strip forms a wall element of the insulating chamber at least in a partial area or the strip guiding device forms a structural unit with wall elements of the insulating chamber in a partial area.
  • the transport channel for the cast steel strip essentially comprises a quarter circle arc along the lateral surface of the casting roll.
  • the cast steel strip can be derived directly to a horizontal transport device.
  • the clear width of the transport channel is equal to or greater than the thickness of the cast steel strip.
  • the clearance width of the transport channel is largely matched to the thickness of the metal strip, it is necessary to form the support elements by non-driven support rollers, which are preferably resiliently supported in the strip guide device in order to introduce no reaction forces into the metal strip.
  • the strip guiding device has vertically below the strip formation cross section formed by the casting rolls or below the casting roll forming the transport channel a passage opening closable with a closure device for an initial piece of the cast steel strip.
  • This closure device preferably consists of a flap pivotable about a horizontal axis.
  • the thermally highly loaded components of the tape guide device are equipped with internal cooling devices.
  • the substantially horizontally oriented transport device adjoining the transport channel at the lower vertex of the casting roll has a longitudinal extent of at least 1 m, but preferably at least 2 m, but should not exceed 6 m, so that thicker strips are produced at lower casting and transport speeds Too much cooling of the steel strip is avoided.
  • the transport device can be inclined up to +/- 15 ° to the horizontal.
  • the transport device comprises driven rollers or roller pairs.
  • the metal strip has already cooled down to such an extent that the metal strip can be exposed to a sufficient contact pressure without the risk of tearing or an increased risk of cracking on the strip surface.
  • the substantially horizontally oriented transport device includes a preferably formed as a loop pit band memory.
  • the lead-in area in the strip store and the exit area from the strip store are designed in such a way that an asymmetrical loop of the strip is produced in the strip store. This is accomplished by having the tape store include an entry area into the tape store and a run-out area from the tape store, and the exit area from the tape store is lowered from the run-in area to the tape store.
  • a swing-in and swing-bridging chute is arranged, which ensures that when casting without cold strip, the leading edge of the cast steel strip safely overcomes the loop pit by means of gravity support on the swung-over bridging chute.
  • a belt steering device assigned. If required, a temperature compensation device is additionally arranged upstream of the first rolling stand.
  • a continuous or segmented insulating chamber enclosing the transport path of the steel strip is arranged between the casting rolls and the first rolling mill stand.
  • these the transport path of the steel strip enclosing isolation chamber may end earlier and extend, for example, only along the transport path between the casting rolls and the exit region of the tape storage.
  • a segmentation of the insulating chamber is useful if additional units, such as drivers, cooling sections or profile measuring devices are arranged in the extension region of the insulating chamber.
  • the strip caster comprises a two-roll caster 1 with two driven and oppositely rotating casting rolls 2, 3, which together with two front side of the casting rolls adjacent to these side plates 4, one of which is shown with dashed lines, a melting chamber 5 for receiving molten steel and in the narrowest Cross-section between the lateral surfaces 6, 7 form the Band Struktursquerites 8.
  • a melting chamber 5 for receiving molten steel and in the narrowest Cross-section between the lateral surfaces 6, 7 form the Band Struktursquerites 8.
  • the out of the band forming cross-section 8 by the rotational movement of the casting rolls discharged steel strip 12 with a defined width and thickness is fed in a transport channel 13 over a quarter circle of the casting roll 3 a transport device 14, which connects directly to the transport channel 13.
  • the transport channel 13 extends along the lateral surface 7 of the casting roll 3 substantially from the band forming cross-section 8 to the lower vertex 15 of the casting roll 3.
  • the transport channel is bounded by the rotating jacket surface 7 of the casting roll 3 and by support elements 16 of a belt guiding device 17.
  • the support members 16 are in this case of non-driven, internally cooled support rollers 18, of which only one is shown, or formed by movable skids 19.
  • the individual components of the equipped with cooling devices tape guide device 17 are connected together with not shown wall elements of the transport channel 13 by a frame structure also not shown in detail to form a functional assembly.
  • the tape guide device 17 and thus the transport channel 13 are surrounded by an insulating chamber 21 and integrated into it structurally.
  • the insulating chamber rests against the casting rolls with sealing elements, not shown, and forms with the casting rolls 2, 3 a space defined by the ambient atmosphere in which a protective gas atmosphere can be set and maintained.
  • the insulating chamber 21 is connected to a protective gas supply line 22.
  • the protective gases used are largely oxygen-free gases.
  • a temperature control in the steel strip adapted to the respective steel quality of the steel strip to be cast takes place predominantly by heat removal via the roller shell of the casting roll 3, which is controlled by an internal cooling device 23 in the casting roll 3. It is therefore expedient if the steel strip rests against the roller casing 7 of the casting roll 3, but without being pressed against these or being stretched by applying a high strip tension over the quarter circle arc.
  • the internal cooling means of the two casting rolls 2, 3 must meet different requirements. Both casting rolls have the task of forming strand shells with the same growth development on their lateral surface. For this purpose, as identical cooling conditions as possible are to be set over the casting period in the contact regions of the molten steel with the casting-roll shell surface. In addition, additional heat removal from the steel strip through the lateral surface of the casting roll must be made possible on one of the casting rolls 3 along the quarter circle arc between the strip formation cross section and the lower vertex of the casting roll. Accordingly, the cooling capacity of the casting roll 3 is interpreted.
  • To the transport channel 13 includes in the region of the lower vertex of the casting roll 3 directly to a transport device 14, which extends horizontally and is designed as a roller table of conventional design with a roller conveyor. In the transition region from the transport channel 13 to the transport device 14, the steel strip is straightened and leaves the light contact with the casting roll.
  • Three rollers are designed as driven rollers 26a, 26b, 26c and ensure the continuous transport of the steel strip with casting speed.
  • a speed control of the driven rollers 26a to 26c of the strip tension is set in the lower vertex 15 of the casting roll 3 to a value that ensures a slight concern of the metal strip to the lateral surface 7 of the casting roll 3, but hardly any repercussions in the sense of Bandzugêten in the steel strip in the area of the quarter circle arc between the Band Struktursquerrough 8 and the lower vertex 15 causes.
  • a driven roller 26b with an engageable roller 26b ' may form a pair of rollers 27 and ensure a slip-free, controlled belt transport.
  • To the transport device 14 includes in the belt running direction designed as a loop pit band memory 30, with a decoupling of the casting process of downstream belt treatment steps, such as a reduction in thickness in a roll stand 31, takes place.
  • the tape storage is dimensioned so that differences between casting speed and rolling speed can be easily compensated.
  • the horizontal loop pit outlet region 32 is lowered relative to the horizontal loop pit inlet region 33 by the distance A, whereby a asymmetric loop forms. Between the loop pit inlet region 33 and the loop pit outlet region 32, a bridging chute 37 bridging the loop pit 30 is arranged, which is designed to be pivotable.
  • the bridging chute is coupled to a pivot drive, not shown, and can be pivoted from a position B bridging the loop pit to a position C opening the loop pit and back.
  • a pivot drive not shown
  • the leading edge of the steel strip produced is transported by gravity, via the bridging chute inclined downwards in the direction of the belt transport.
  • a large driven roller 26d is disposed, which may be associated with an upper roller, in contrast to a sole construction of tape tension in the steel strip as a consequence of a loop of tape in the loop pit in addition to the influence of the belt loop or instead tensile tensile stresses or belt compressive stresses can be introduced into the steel strip, which at least partially reach back to the casting roll.
  • a single-stand rolling stand 31 which is preceded by a strip deflecting device 35 and a temperature compensation device 36, the cast steel strip is reduced to hot strip final thickness and adjusted in the steel strip a rolling structure. Subsequently, the steel strip is wound in a tape reeling device 34 into bundles with a predetermined target weight.
  • the band reeling device is preceded by a dividing shear.
  • a CCD camera 38 is positioned in the initial region of the horizontal transport device 14.
  • the lateral surfaces of the two casting rollers dive with a surface temperature of about 60 - 100 ° C and at a rotational speed corresponding to a casting speed of about 90 m / min, in the molten steel, where The internally cooled lateral surfaces strand shells are formed, which are moved with the lateral surfaces and in reaching the band formation cross-section in total have grown to about the band thickness and connect there to a largely solidified band.
  • the steel strip enters the transport channel and is within the formed by a quarter arc transport channel with a cooling rate of about 45 ° K / s on a Temperature of about 1365 ° C ⁇ 20 K cooled in the lower vertex of the casting roll.
  • This forms a microstructure, which is characterized by ferritic grains.
  • the steel strip passes through a protective gas atmosphere, wherein this is predominantly formed by nitrogen, with small amounts of 02, H2, Ar and other natural noble gases are present.
  • the steel strip is further cooled by radiation and tape contact with the transport rollers and a strip tension is applied to the steel strip, with a concern of the steel strip is ensured to the lateral surface of the casting roll in the transport channel, without a substantial strip tension in this area effectively becomes.
  • the strip cooling in the area of the transport device can be assisted by additional gas cooling.
  • the steel strip After passing through the strip accumulator, the steel strip is reduced in thickness by 15-50% in a roll stand at a strip inlet temperature of 900 ° -1050 ° C. and then wound into coils at 500 ° -850 ° C. in a ribbon reeling device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Braking Arrangements (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Clamps And Clips (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP05787257A 2004-10-29 2005-09-20 Verfahren zum herstellen eines gegossenen stahlbandes Not-in-force EP1812185B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0182304A AT501044B8 (de) 2004-10-29 2004-10-29 Verfahren zum herstellen eines gegossenen stahlbandes
PCT/EP2005/010130 WO2006048078A1 (de) 2004-10-29 2005-09-20 Verfahren zum herstellen eines gegossenen stahlbandes

Publications (2)

Publication Number Publication Date
EP1812185A1 EP1812185A1 (de) 2007-08-01
EP1812185B1 true EP1812185B1 (de) 2008-07-30

Family

ID=35344687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05787257A Not-in-force EP1812185B1 (de) 2004-10-29 2005-09-20 Verfahren zum herstellen eines gegossenen stahlbandes

Country Status (10)

Country Link
US (2) US20080105399A1 (es)
EP (1) EP1812185B1 (es)
KR (1) KR101247251B1 (es)
CN (1) CN100484660C (es)
AT (2) AT501044B8 (es)
AU (1) AU2005300847B2 (es)
DE (1) DE502005004910D1 (es)
DK (1) DK1812185T3 (es)
MX (1) MX2007004981A (es)
WO (1) WO2006048078A1 (es)

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Publication number Publication date
AT501044B8 (de) 2007-02-15
CN101048246A (zh) 2007-10-03
ATE402771T1 (de) 2008-08-15
AU2005300847A1 (en) 2006-05-11
DK1812185T3 (da) 2008-12-01
US20080105399A1 (en) 2008-05-08
WO2006048078A1 (de) 2006-05-11
DE502005004910D1 (de) 2008-09-11
US8127826B2 (en) 2012-03-06
KR101247251B1 (ko) 2013-03-25
EP1812185A1 (de) 2007-08-01
CN100484660C (zh) 2009-05-06
KR20070073951A (ko) 2007-07-10
AU2005300847B2 (en) 2010-08-19
AT501044A4 (de) 2006-06-15
AT501044B1 (de) 2006-06-15
US20100078146A1 (en) 2010-04-01
MX2007004981A (es) 2007-10-10

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