EP2441540A1 - Verfahren und Anlage zur energieeffizienten Erzeugung von Stahlwarmband - Google Patents

Verfahren und Anlage zur energieeffizienten Erzeugung von Stahlwarmband Download PDF

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Publication number
EP2441540A1
EP2441540A1 EP10187232A EP10187232A EP2441540A1 EP 2441540 A1 EP2441540 A1 EP 2441540A1 EP 10187232 A EP10187232 A EP 10187232A EP 10187232 A EP10187232 A EP 10187232A EP 2441540 A1 EP2441540 A1 EP 2441540A1
Authority
EP
European Patent Office
Prior art keywords
strand
thickness
casting
guiding device
rolling
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.)
Withdrawn
Application number
EP10187232A
Other languages
German (de)
English (en)
French (fr)
Inventor
Gerald Hohenbichler
Josef Watzinger
Gerald Eckerstorfer
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 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 Austria filed Critical Siemens VAI Metals Technologies GmbH Austria
Priority to EP10187232A priority Critical patent/EP2441540A1/de
Priority to RU2013121553/02A priority patent/RU2579723C2/ru
Priority to CN201180049441.5A priority patent/CN103228377B/zh
Priority to US13/877,876 priority patent/US9296027B2/en
Priority to EP11771071.5A priority patent/EP2627464B1/de
Priority to KR1020137012335A priority patent/KR101809108B1/ko
Priority to PCT/EP2011/067670 priority patent/WO2012049135A1/de
Priority to BR112013008766A priority patent/BR112013008766A2/pt
Publication of EP2441540A1 publication Critical patent/EP2441540A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/043—Curved moulds
    • 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
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • 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
    • B22D11/142—Plants for continuous casting for curved casting
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the invention relates to a method for the continuous or semicontinuous production of steel hot strip, which is rolled starting from a guided through a strand guide strand in a roughing train to an intermediate belt and subsequently in a finishing train to an end belt, according to claim 1 and a corresponding plant for Implementation of this method according to claim 21.
  • the cast strands are divided after casting and fed the separated strands or slabs without intermediate storage and cooling to ambient temperature of the rolling mill.
  • the strand emerging from the mold of the casting plant first passes through a strand guiding device directly following the mold.
  • the strand guiding device also referred to as "strand guiding corset”
  • the support rollers are rotatable about an axis orthogonal to the transport direction of the strand.
  • individual guide elements may also be used as static, e.g. run skid-shaped components.
  • these are arranged on both sides of the strand broad sides, so that the strand is guided by upper and lower guide element series and conveyed to a roughing mill.
  • the strand is supported not only by the strand guiding device, but also by a lower end portion of the mold, which is why the mold could also be regarded as part of the strand guiding device.
  • the Strangerstarrung begins at the upper end of the (continuous) mold at the bathroom mirror, the so-called "meniscus", the mold is typically about 1m long (0.3 - 1.5m).
  • the strand exits vertically downward from the mold and is deflected into the horizontal.
  • Strand guiding device therefore has a substantially curved over an angular range of 90 ° course.
  • the emerging from the strand guide device strand is reduced in thickness in the roughing mill (HRM, High-Reduction Mill), the resulting intermediate band is heated by means of a heater and rolled finished in a finishing train.
  • HRM roughing mill
  • the finishing train is hot rolled, that is, the rolling stock has a temperature above its recrystallization temperature during rolling. For steel this is the range above about 750 ° C, usually is rolled at temperatures up to 1200 ° C warm.
  • the metal is usually in the austenitic state, where the iron atoms are arranged cubic face centered.
  • the austenite area of a steel depends on the steel composition, but is usually above 800 ° C.
  • the steel strips produced are processed, inter alia, for motor vehicles, household appliances and the construction industry.
  • EP 0 415 987 B1 EP 1 469 954 B1 and DE 10 2007 058 709 A1 and WO 2007/086088 A1 known.
  • a steel strip of less than 0.8 mm thickness can be produced without winding problems, whereby uniform and repeatable mechanical properties can be ensured over the entire width and length of the steel strip.
  • Arvedi comprises a continuous casting line following a continuous caster with three roughing stands, two strip cutters, an induction furnace for intermediate heating of the pre-rolled intermediate strip, followed by a finishing train with five finishing stands.
  • the end strip emerging from the roughing train is cooled in a cooling section and wound up by means of three underfloor reels to form rolls of tape with a weight of up to 32 tons.
  • the underfloor coiler is preceded by a separation device in the form of a high-speed shear.
  • the production capacity of this single-stranded production line is about 2 million tons per year.
  • Such a system allows the production of hot strips with a final thickness between 0.8 and 4 mm in continuous operation.
  • Steel strip coils can be produced in semi-continuous operation at final strip thicknesses between 4 and 12 mm, however, according to the inventors' calculations for low carbon steels in continuous operation, a minimum specific minimum throughput of about 450 mm * m / min is required to use all five finishing stands in the finishing train can.
  • end of the strand guiding device is thus understood in the present context intended for strand contacting guide surface or surface line of the last of the roughing facing guide element or the last support roller of the upper guide elements series.
  • a strand support length of 17 m has the consequence that the cross-sectional core of the strand is completely solidified even before the emergence of the strand, namely several meters before the end of the strand guiding device.
  • the known from the ISP process processing advantage of a hot steel strip core is thus not or only insufficiently given.
  • the rolling of a completely through-solidified or cooler cast strand requires a much higher energy expenditure than the rolling of a cast strand with a very hot cross-sectional core.
  • a kokillenfernere "Sumpfspitze" of the liquid sump is defined as that central cross-sectional area of the strand, in which the temperature just corresponds to the steel solidus temperature and then drops below this.
  • the temperature of the sump tip therefore corresponds to the solidus temperature of the respective steel grade (typically between 1300 ° C and 1535 ° C.
  • the sump tip d.i. the just still doughy cross-sectional core of the strand transported in the strand guiding device, is always as close as possible to the end of the strand guiding device and thus as close as possible to the entrance to the rough rolling mill.
  • the invention is therefore based on the object for a variety of steel grades, cooling parameters and strand thicknesses to find those casting and plant parameters, under which the sump tip of the strand as far as possible far away from the mold, i. can be kept as close to the end of the strand guide device.
  • the casting speed or the volume flow passing through the strand guiding device must not be too great, since in such a case the swamp tip is moved beyond the strand guiding device and thus into the air Bulging and bursting of the strand could take place.
  • a combination of these casting parameters ensures that the bottom tip of the strand always reaches almost to the end of the strand guiding device, regardless of the respective material-quality-dependent maximum casting speeds.
  • the strand has a sufficiently hot cross-sectional core during its thickness reduction at least in the first of the strand guide device downstream rolling mill, to be rolled with relatively low energy consumption and ensuring high production quality.
  • the strand support length is less than or equal to 15.5 m, preferably in a range between 13 and 15 m, in particular between 14.2 and 15 m.
  • a roughing of the strand to an intermediate band in at least four rolling passes, ie using four roughing stands, preferably in five rolling passes, ie using five roughing stands.
  • a rough rolling of the billet takes place in three rolling passes, the energy efficiency of the casting / rolling process can be further increased by carrying out according to the invention four or five rolling passes.
  • four or five rolling passes are performed in rapid succession, the casting heat still in the strand is optimally utilized.
  • a very narrow thickness range of the intermediate band (between 3 and 15 mm, preferably between 4 and 10 mm) is achieved when four or five passes are made, almost independent of the starting thickness of the casting strand, so that a heating device arranged downstream of the roughing line, for example an inductive transverse field heating furnace, can be designed exactly to a specific thickness range of the intermediate band. Energy losses due to a too large dimensioning of the recording of the heater can thus be avoided.
  • the four or five rolling passes taking place in the rough rolling mill take place within a maximum of 80 seconds, preferably within a maximum of 50 seconds.
  • the first rolling pass in the rough rolling takes place within a maximum of 5.7 minutes, preferably within not more than 5.3 minutes from the beginning of solidification of the liquid strand in the casting plant.
  • the first pass in the roughing mill takes place within a maximum of 4.8 minutes, even at casting speeds in the region of 4 m / min.
  • a reduction of the thickness of the strand by 35-60%, preferably by 40-55% takes place in the roughing mill per rolling pass.
  • an intermediate strip with a thickness of approximately 3 to 15 mm, preferably with a thickness of 4 to 10 mm leaves the rough rolling line 4.
  • the intermediate strip is rolled in a previously described ESP system according to the prior art to a thickness between 10 and 20 mm.
  • a temperature loss rate of the intermediate strip emerging from the rough rolling mill is below a maximum of 3 K / m, preferably below a maximum of 2.5 K / m. It would also be conceivable to realize a temperature loss rate ⁇ 2 K / m.
  • a heating of the emerged from the roughing intermediate belt by means of an inductive heating device, preferably in the transverse field heating method, starting at a temperature above 725 ° C, preferably above 850 ° C to a temperature of at least 1100 ° C, preferably to a temperature above 1180 ° C.
  • the heating of the intermediate band within a period of 4 to 30 seconds, preferably within a period of 5 to 15 seconds.
  • the passage of time between the first pass and the inlet into the heating device does not exceed 110 seconds for intermediate strip thicknesses of 5-10 mm, preferably not longer than 70 seconds.
  • a finish rolling of the heated intermediate strip in the finishing train in four rolling passes, i. using four finishing stands or in five rolling passes, i. using five finishing stands to an end strip with a thickness of ⁇ 1.5 mm, preferably ⁇ 1.2 mm.
  • rolling to final thicknesses of ⁇ 1 mm is also possible.
  • the rolling passes carried out within the finishing train through the five or four finishing stands take place within a maximum period of 12 seconds, preferably within a maximum period of 8 seconds.
  • the extruded from the mold and entering the strand guide device strand has a strand thickness between 95 and 110 mm, preferably a strand thickness between 102 and 108 mm.
  • liquid core reduction (LCR) thickness reduction of the strand to the contacting predetermined guide elements of the strand guiding device relative to a longitudinal axis of the strand (transversely) adjustable with an adjustment of the guide elements depending on the material of the strand and / or the casting speed is made to reduce the strand thickness by up to 30 mm.
  • the strand thickness quasi-static i. shortly after the start of pouring or the casting of a casting sequence, as soon as the "leading strand area", referred to as the "strand head”, has passed the guide elements intended for reducing the thickness, it is set once.
  • the strand thickness may be dynamically adjustable, i. is arbitrarily variable during the casting process or during the passage of the strand through the strand guiding device.
  • the dynamic setting is then preferably set by the operating team depending on the steel grade and the actual casting speed, if this changes only on a case-by-case basis.
  • the LCR thickness reduction is between 0 and 30 mm, preferably between 3 and 20 mm.
  • this function can also be taken over by an automated device, especially if very frequent changes in thickness or speed would be usual or necessary.
  • Corridor areas are specified for the speed factor K, within which a casting operation can be carried out efficiently and meaningfully.
  • a coolant preferably water
  • the application of the coolant to the strand takes place by means of an injection device, which can comprise any desired number of spray nozzles.
  • influencing factors for the speed of strand cooling are the design of the guide elements or strand support rollers of the strand guide device (internal or shell-cooled strand support rollers), the arrangement of the support rollers, in particular the ratio of the support roller diameter to the distance between adjacent support rollers, the spray character of the nozzles and the coolant or water temperature.
  • a specific speed factor K takes place in particular as a function of the steel grade or the cooling characteristic of the strand.
  • a speed factor K lying in the upper region of a corridor region proposed according to the invention can be used, while for slower steel grades a velocity factor K lying in the middle or lower region of a corridor region proposed according to the invention is used.
  • An operation according to the inventively proposed speed factors K allows optimum utilization of the casting heat contained in the strand for the subsequent rolling process and an optimization of the material throughput and thus a productivity advantage (with operational decrease of the casting speed, the strand thickness can be increased and thereby the material throughput can be increased).
  • Claim 21 is directed to a system for carrying out the method according to the invention for the continuous or semi-continuous production of steel strip, comprising a casting machine with a mold, a subordinate strand guiding device, a downstream Vorwalz Sounds, one of these downstream, inductive heating and one of these downstream finishing train, said the strand guiding device has a lower series of guide elements and a parallel or converging arranged upper series of guide elements and formed between the two guide element series for receiving the strand emerging from the casting strand receiving shaft, which by forming different distances between opposing guide elements to each other in the transport direction the strand is at least partially tapered and thus the strand is thickness reducible.
  • the clear receiving width of the receiving shaft is at its input of the casting line between 95 and 110 mm, preferably between 102 and 108 mm.
  • the strand support length is less than or equal to 15.5 m, preferably in a range between 13 and 15 m, in particular between 14.2 and 15 m.
  • the roughing mill comprises four or five roughing stands.
  • a thermal cover is provided between the end of the receiving shaft and the strand guide device and an inlet region of the roughing, at least partially surrounding a conveyor device provided for transporting the strand and thus a cooling of the strand delayed.
  • the heating device is designed as an inductive transverse field heating furnace, by means of which the strand, starting at a temperature above 725 ° C, preferably above 850 ° C to a temperature of at least 1100 ° C. , preferably to a temperature above 1180 ° C is heatable.
  • the finishing train comprises four or five finishing mills, by means of which an intermediate strip emerging from the roughing train can be reduced to an end strip with a thickness ⁇ 1.5 mm, preferably ⁇ 1.2 mm.
  • the finishing mills are arranged at intervals of ⁇ 7 m, preferably at intervals of ⁇ 5 m to each other, the distances between the working rolling axes of the finishing mills are measured.
  • certain guide elements are adjustable and thereby a light receiving width of the receiving shaft or smaller can be increased, wherein the strand thickness or the clear receiving width is adjustable depending on the material of the strand and / or the casting speed.
  • the adjustable guide elements are arranged in one of the mold half facing the front half, preferably in a mold facing the front quarter of the longitudinal extension of the strand guiding device.
  • a work roll axis of the strand guide device next adjacent first roughing stand of the roughing maximum 7 m, preferably maximum 5 m after the end of the strand guiding device is arranged.
  • a feed end of the heating device facing the rough rolling mill is arranged a maximum of 25 m, preferably a maximum of 19 m, of the work roll axis of the roughing stand closest to the heating device.
  • Fig.1 shows schematically a plant 1, by means of which a method according to the invention for the continuous or semi-continuous production of steel hot strip is feasible.
  • a vertical casting machine with a mold 2 are cast in the strands 3, which have a strand thickness d between 95 and 110 mm, preferably a strand thickness d between 102 and 108 mm at the end of the mold 2.
  • the mold 2 is preceded by a pan 39, which feeds a distributor 40 with liquid steel via a ceramic inlet nozzle.
  • the distributor 40 feeds subsequently the mold 2, which is followed by a strand guiding device 6.
  • a rough rolling 4 which may consist of a - as here - or of several scaffolds and in which the strand 3 is rolled to an intermediate thickness.
  • a rough rolling 4 which may consist of a - as here - or of several scaffolds and in which the strand 3 is rolled to an intermediate thickness.
  • the transformation of cast structure into fine-grained rolling structure takes place.
  • the plant 1 further comprises a number of components such as descaling devices 41, 42 and Fig.1 Separation devices not shown, which essentially correspond to the prior art and which is therefore not discussed in detail at this point.
  • the severing devices for example in the form of high-speed shears, can be arranged at any position of the plant 1, in particular between the rough rolling mill 4 and the finishing train 5 and / or in a downstream region of the finishing train 5.
  • the heater 7 is designed in the present embodiment as an induction furnace.
  • a transverse field heating induction furnace is used, which makes the system 1 particularly energy efficient.
  • the heater 7 could also be used as a conventional oven, e.g. be performed with flame treatment, or as a mixing furnace, consisting of HC fuel-fired and inductive segments.
  • the intermediate band 3 ' is brought relatively uniformly over the cross section to a desired inlet temperature for the inlet to the finishing train 5, the inlet temperature usually depending on Steel grade and subsequent rolling in the finishing train 5 between 1000 ° C and 1200 ° C.
  • the strand support length L is in this case between the meniscus 13 of the mold or the casting plant 2 and the axis of the last, a Vorwalz Sounds 4 facing support roller one and described in more detail below upper guide element series 10th Measured (considered in a side view of the Appendix 1 in parallel to the axes of the roles of looking according to Fig.1 ).
  • the strand support length L is measured at an outer broad side of the strand 3 or the strand guiding device 6 (and a section of the interior of the mold 2) opposite the center of the radius of curvature of the strand 3 or the strand guiding device 6.
  • Fig.2 a concentric to the strand support length L auxiliary dimension line L 'located.
  • a casting speed of the strand 3 (which is essentially also the speed of the strand 3 when passing through the strand guiding device 6, ie also the speed of the strand 3 at the end 14 of the strand guiding device) is measured during stationary continuous operation 6), in a range of 3.8-7 m / min, preferably in a range of 4.2-6.6 m / min.
  • a combination of these parameters ensures that an initially defined sump tip of the strand 3, regardless of the respective material quality-dependent maximum casting speeds, always approaches relatively close to the end of the strand guiding device and thereby the strand 3 with relatively low energy expenditure and ensuring high production quality to a desired intermediate thickness - And subsequently can also be finished.
  • the strand support length L is less than or equal to 15.5 m, preferably the strand support length L is in a range between 13 and 15 m.
  • the strand support length L is at least 12 m, preferably at least 13m.
  • the four or five rolling passes taking place in the rough rolling mill 4 take place within a maximum of 80 seconds, preferably within a maximum of 50 seconds.
  • the first rolling pass in the roughing mill 4 takes place within a maximum of 5.7 minutes, preferably within a maximum of 5.3 minutes, from the start of solidification of the liquid strand present in the casting installation 2.
  • the first pass in the pre-rolling line 4 takes place within a maximum of 4.8 minutes, even at a low continuous casting speed of 4 m / min.
  • the surface of the strand 3 has in this area on average a temperature> 1050 ° C, preferably> 1000 ° C.
  • a preferably hinged thermal cover is provided to hold the heat as possible in the strand 3.
  • the thermal cover surrounds one for transporting the strand 3 provided, usually designed as a roller conveyor conveyor at least in sections.
  • the thermal cover can surround the conveying device from above and / or from below and / or laterally.
  • a temperature loss rate of the intermediate strip 3 'emerging from the roughing train 4 is below a maximum of 3 K / m, preferably below a maximum of 2.5 K / m. It would also be conceivable to realize temperature loss rates ⁇ 2 K / m. Such a temperature loss rate is achieved by heat radiation and / or convection from the intermediate belt and can be controlled by an appropriate choice of thermal boundary conditions (covers, tunnels, cold air, humidity, ...) and transport speed or mass flow.
  • the heating of the intermediate strip 3 'takes place within a period of 4 to 30 seconds, preferably within a period of 5 to 15 seconds.
  • a strand 3 which is 80 mm thick when emerging from the strand guiding device 6 and which is reduced in the rough rolling mill 4 to an intermediate strip 3 'having a thickness of 5 mm, after 260 at the latest Seconds, preferably after at the latest 245 seconds from exiting the mold 2 is introduced into the inductive heating device 7 and that at exit from the strand guide device 6 95 mm thick strand 3, which in the roughing 4 to an intermediate band 3 'with a thickness of 5 5 mm, is introduced into the inductive heating device 7 at the latest after 390 seconds, preferably after at the latest 335 seconds from the exit from the mold 2.
  • a finish rolling of the heated intermediate strip 3 'in the finishing train 5 is preferably carried out in four rolling passes, ie using four finishing stands 5 1 , 5 2 , 5 3 , 5 4 or in five rolling passes, ie using five finishing stands 5 1 , 5 second , 5 3 , 5 4 , 5 5 to an end band 3 "having a final thickness of ⁇ 1.5 mm, preferably ⁇ 1.2 mm, and rolling to final thicknesses of ⁇ 1 mm is also possible by means of a method according to the invention.
  • the finishing mills 5 1 , 5 2 , 5 3 , 5 4 , 5 5 are each arranged at intervals of ⁇ 7 m, preferably at intervals of ⁇ 5 m to each other (measured between the working rolling axes of the finishing mills 5 1 , 5 2 , 5 3 , 5 4 , 5 5 ).
  • carried out within the finishing train 5 rolling passes within a period of a maximum of 12 seconds, preferably within a maximum of 8 seconds.
  • the end strip 3 is subsequently cooled to a reel temperature of between 500 ° C. and 750 ° C., preferably 550 ° C. and 650 ° C., and wound up into a bundle
  • the end strip 3 'or the intermediate strip is severed 3 'or of the strand 3 in a direction transverse to the direction of transport 15 and a finished reeling of the rolling-machine side loose end strip 3'
  • a deflection and stacking of the end strip 3 " would also be possible.
  • Fig.2 includes the Strand guiding device 6 more for the passage of the strand 3 predetermined guide segments 16 according to Figure 3 , each one of (in Figure 3 not shown) lower series of guide elements 9 and a parallel or converging arranged upper series of guide elements 10 are constituted.
  • Each guide element of the lower guide element series 9 is assigned to an opposite guide element of the upper guide element series 10.
  • the guide elements are thus arranged in pairs on both sides of the broad sides of the strand 3.
  • the guide elements 9, 10 are designed as rotatably mounted support rollers.
  • the upper and lower einsetti- or support roller series 9, 10 can each be in turn divided into (sub-) series specific support rollers with different diameters and / or center distances.
  • the guide elements of the upper guide elements series 10 are selectively depth-adjustable or can be approximated to the guide elements of the lower guide elements series 9.
  • An adjustment of the guide elements of the upper guide element series 10 and thus a change of the clear receiving cross section 12 of the strand guiding device 6 can e.g. done by means of a hydraulic drive.
  • a clear receiving width 12 of the receiving shaft 11 of the strand guiding device 6 corresponding to the desired strand thickness d and measured between opposing upper and lower guide elements could be e.g. be reduced from 100 mm to a range between 70 and 90 mm.
  • the thickness of the strand for example, three to eight guide elements (pairs) of one of the mold 2 facing - but not necessarily adjoining the mold 2 - first guide segment 16 'adjustable.
  • several juxtaposed guide segments 16 can be used for LCR thickness reduction, which connect directly or indirectly to the mold.
  • the strand thickness d or the light receiving width 12 can be set as a function of the material of the strand 3 and / or as a function of the casting speed.
  • the adjustment of the respective guide elements 9, 10 takes place in a direction substantially orthogonal to the transport direction of the strand extending direction, wherein both the upper guide elements 10 and the lower guide elements 9 can be adjustable.
  • upper guide elements 10 are hinged to corresponding support members 17, which are preferably hydraulically adjustable.
  • the (hydraulically) adjustable LCR guide elements 9, 10 are preferably in one of the mold 2 facing the front half, preferably in a mold 2 facing the front quarter of the longitudinal extent of Strand guiding device 6 is arranged.
  • the adjustment of the strand thickness d or the clear receiving width 12 can be quasi-static, ie once, shortly after the start of casting, as soon as one of the pre-rolling line 4 facing head portion of the cast strand 3 reaches the end of the strand guide device 6 or has passed the LCR guide elements, or dynamically, ie during the casting process or during the continuous quasi-stationary passage of the strand 3 through the strand guiding device 6.
  • this is during the passage of a strand 3 through the Strand guiding device 6 as often as desired, using a below based on Figure 7 explained relationship as a guideline, changed.
  • Figure 4 shows a diagram for systems according to the prior art, based on which maximum allowable Casting speeds for strands with different thicknesses are readable.
  • the casting speed in the unit [m / min] is plotted on the ordinate a material-specific solidification factor k, which carries the unit [mm / ⁇ min].
  • the solidification factor k is between 24-27 mm / ⁇ min, preferably between 25 and 26 mm / ⁇ min.
  • Figure 5 shows a diagram with Figure 4 Corresponding abscissa and ordinate scales, however, for strands which are cast in a strand support device 6 with proposed according to the invention, particularly advantageous metallurgical strand support length L of 15.25 m.
  • the pouring characteristics according to the invention described below are chosen purely by way of example and are not intended to be limiting. In principle, there is no fixed speed value for each strand thickness, but always a corresponding velocity range under which the casting process can be reasonably conducted. Likewise, the strand support length L is not set to a certain value such as 15.25 m Figure 4 but the calculations and considerations of the inventors have shown that strand support lengths L in the range between 12 and 16.5 m already allow significant advantages over known systems.
  • Figure 6 shows a diagram plotted on the ordinate, the maximum casting speed in the unit [m / min], while on the abscissa, the strand support length L and the "metallurgical length" with the unit [m] is plotted.
  • Three lines 29, 30, 31 are shown, with line 29 indicating a strand thickness of 70 mm, line 30 a strand thickness of 80 mm and line 31 a strand thickness of 90 mm.
  • Figure 7 illustrates the relationship of the strand thickness d with the casting speed v c , wherein a setting of (Target) casting speeds v c or (target) strand thickness d can be determined using speed factors K proposed according to the invention.
  • the following information refers to a steady-state continuous operation of the plant, which in the present context means operating phases with a duration of> 10 minutes, during which the casting speed v c (in contrast to, for example, a gating phase) remains essentially constant.
  • the choice of the speed factor K in addition to the strand support length L in particular depends on the C content of the cast steels or on their cooling characteristics.
  • Fast-setting steel grades allow the system to operate at relatively high casting speeds v c , while lower casting speeds v c are to be selected for slower-setting steel grades in order to prevent bulging and bursting of the strand in the area of the swamp tip.
  • the following tables refer to strands cast steel grades that are "hard” to cool, ie fast solidify and the "medium hard” to cool, ie solidify a little slower.
  • Corridor areas are specified for the speed factor K, within which a casting operation can be carried out efficiently and meaningfully.
  • a strand support length-specific corridor area is limited in each case by a speed factor K_upperLimit and a speed factor K_lowerLimit according to the following tables.
  • the choice of the speed factor K is dependent on the strand support length L and on the steel grade, in particular the carbon content of the cast steels whose solidification or Umwands decisionisitik whose strength or Ductility properties and others Material characteristics depends.
  • a coolant preferably water
  • the application of the coolant to the strand 3 takes place by means of an injection device, not shown, which comprises any number of spray nozzles arranged in any desired configurations (for example behind and / or next to and / or between the guide elements 9, 10).
  • essentially the same construction and boundary conditions of the sprayer and the strand guide device 6 could be about 3 to 4 liters for realizing a hard cooling, 2 to 3 liters to realize a medium-hard cooling and 1 to 2 liters of coolant per to realize a soft cooling kg of extruded steel are applied.
  • Figure 7 shows a diagram with corresponding to the above-mentioned speed factors K curves 32-37.
  • the strand thickness d (measured at the end of the strand guiding device 6 or when entering the rough rolling mill 4) is plotted in the unit [mm], the ordinate represents the casting speed in the unit [m / min].
  • the uppermost characteristic curves for a specific strand support length L correspond to the speed factors K_upperLimit listed above in tabular form.
  • characteristic 32 corresponds to a speed factor K of 35200 and curve 35 to a speed factor K of 44650.
  • the characteristic curves 32 and 35 thus correspond to rapidly solidifying steel grades, which allow a high casting speed and heat dissipation in compliance with standardized quality criteria.
  • the grades 36 and 37 corresponding steel grades are not so "hard” due to their slower solidification, i. not as quickly coolable as a grade 35 corresponding steel grade.
  • the grades 33 and 34 corresponding steel grades are not as cool as a corresponding characteristic 32 steel grade.
  • the cooling speed significantly determines the position of the sump tip within the strand 3.
  • specific curves 32-37 lying casting speed ranges are to be avoided in order to avoid bulging and bursting of the strand 3 in the area of the sump tip.
  • the strand thickness d would have to be raised to approximately 90 mm according to arrow 35 "in order to form the bottom tip of the strand 3
  • the strand thickness d is raised to continue at the end of the strand guiding device 6 and to ensure optimum utilization of the casting heat for the subsequent rolling process approximately 93 mm is displayed to keep the sump tip of the strand 3 continues at the end of the strand guiding device 6.
  • the strand thickness d must be correspondingly reduced in order to eliminate the risk of bulging of the strand 3 in the area of the sump tip.
  • a change in the strand thickness d can be effected by a previously described dynamic LCR thickness reduction by means of the LCR guide segment 16 '.
  • the operating team is notified by an output device in order to reduce the liquid core reduction (LCR) so that the strand thickness d increases, and so the context of the invention or a respective Corridor area to reach again.
  • LCR liquid core reduction
  • a corresponding target casting speed v c can be selected or, starting from a desired casting speed v c the strand thickness d be varied accordingly.
  • the strand thickness d can be increased as the casting speed v c decreases and thereby the material throughput can be increased and thus optimized.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Continuous Casting (AREA)
EP10187232A 2010-10-12 2010-10-12 Verfahren und Anlage zur energieeffizienten Erzeugung von Stahlwarmband Withdrawn EP2441540A1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP10187232A EP2441540A1 (de) 2010-10-12 2010-10-12 Verfahren und Anlage zur energieeffizienten Erzeugung von Stahlwarmband
RU2013121553/02A RU2579723C2 (ru) 2010-10-12 2011-10-11 Способ и установка для энергетически эффективного изготовления горячекатаной стальной полосы
CN201180049441.5A CN103228377B (zh) 2010-10-12 2011-10-11 用于以有能效的方式制造热轧钢带的方法和设备
US13/877,876 US9296027B2 (en) 2010-10-12 2011-10-11 Method and plant for the energy-efficient production of hot steel strip
EP11771071.5A EP2627464B1 (de) 2010-10-12 2011-10-11 Verfahren und anlage zur energieeffizienten erzeugung von stahlwarmband
KR1020137012335A KR101809108B1 (ko) 2010-10-12 2011-10-11 열간 강 스트립의 에너지 효율적인 제조를 위한 방법 및 플랜트
PCT/EP2011/067670 WO2012049135A1 (de) 2010-10-12 2011-10-11 Verfahren und anlage zur energieeffizienten erzeugung von stahlwarmband
BR112013008766A BR112013008766A2 (pt) 2010-10-12 2011-10-11 método e instalação para produção de tiras de aço a quente com eficiência de energia

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EP10187232A EP2441540A1 (de) 2010-10-12 2010-10-12 Verfahren und Anlage zur energieeffizienten Erzeugung von Stahlwarmband

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WO2015014865A1 (de) * 2013-07-30 2015-02-05 Sms Siemag Ag GIEßWALZANLAGE ZUM HERSTELLEN VON METALLBÄNDERN
EP3338914A1 (de) * 2016-12-22 2018-06-27 Primetals Technologies Austria GmbH Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage
IT201700067508A1 (it) * 2017-06-16 2018-12-16 Danieli Off Mecc Metodo di colata continua e relativo apparato
EP4122612A1 (en) * 2021-07-23 2023-01-25 Primetals Technologies Japan, Ltd. Six-high rolling mill stand and finishing mill train for hot rolling an intermediate strip into a thin strip

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EP2441539A1 (de) 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Energie- und ausbringungsoptimiertes Verfahren und Anlage zur Erzeugung von Stahlwarmband
EP2441540A1 (de) 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Verfahren und Anlage zur energieeffizienten Erzeugung von Stahlwarmband
US9725780B2 (en) 2014-06-13 2017-08-08 M3 Steel Tech Modular micro mill and method of manufacturing a steel long product
JP6263094B2 (ja) * 2014-06-30 2018-01-17 新日鉄住金エンジニアリング株式会社 連続鋳片加熱装置の芯出し用ゲージ及び芯出し方法
KR101930660B1 (ko) * 2014-12-24 2018-12-18 제이에프이 스틸 가부시키가이샤 강의 연속 주조 방법
DE102015216512A1 (de) * 2015-08-28 2017-03-02 Sms Group Gmbh Anlage nach dem CSP-Konzept sowie Verfahren zum Betreiben einer solchen Anlage
CN105665662B (zh) * 2016-03-09 2017-08-08 日照宝华新材料有限公司 基于esp线的药芯焊丝用钢制造方法
CN205659983U (zh) * 2016-06-15 2016-10-26 日照宝华新材料有限公司 一种esp生产线用长公里数轧制辊
CN107597845B (zh) * 2017-10-16 2023-08-11 北京科技大学 无头连铸连轧超深冲用超低碳钢卷铁素体轧制方法和装置
CN107597844A (zh) * 2017-10-16 2018-01-19 北京科技大学 无头连铸连轧深冲用低微碳钢卷的铁素体轧制方法和装置
CN115351082B (zh) * 2022-08-24 2024-07-09 中冶赛迪工程技术股份有限公司 一种连续热轧超薄低碳带钢的方法及生产线

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WO2015014865A1 (de) * 2013-07-30 2015-02-05 Sms Siemag Ag GIEßWALZANLAGE ZUM HERSTELLEN VON METALLBÄNDERN
CN105492132A (zh) * 2013-07-30 2016-04-13 Sms集团有限公司 用于制造金属带材的连铸连轧设备
EP3027330B1 (de) 2013-07-30 2018-09-26 SMS group GmbH Giesswalzanlage zum herstellen von metallbaendern
EP3338914A1 (de) * 2016-12-22 2018-06-27 Primetals Technologies Austria GmbH Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage
WO2018115324A1 (de) * 2016-12-22 2018-06-28 Primetals Technologies Austria GmbH Verfahren zur endlosen herstellung eines aufgewickelten warmbands in einer giess-walz-verbundanlage, verfahren zum anfahren einer giess-walz-verbundanlage und giess-walz-verbundanlage
WO2018229808A1 (en) * 2017-06-16 2018-12-20 Danieli & C. Officine Meccaniche S.P.A. Continuous casting method and corresponding apparatus
IT201700067508A1 (it) * 2017-06-16 2018-12-16 Danieli Off Mecc Metodo di colata continua e relativo apparato
EA034010B1 (ru) * 2017-06-16 2019-12-18 Даньели Энд К. Оффичине Мекканике С.П.А. Способ и устройство для непрерывного литья
EP3628415A1 (en) 2017-06-16 2020-04-01 Danieli & C. Officine Meccaniche S.p.A. Continuous casting method and corresponding apparatus
US10758972B2 (en) 2017-06-16 2020-09-01 Danieli & C. Officine Meccaniche Spa Continuous casting method and corresponding apparatus
US11130172B2 (en) 2017-06-16 2021-09-28 Danieli & C. Officine Meccaniche Spa Continuous casting method and corresponding apparatus
EP4122612A1 (en) * 2021-07-23 2023-01-25 Primetals Technologies Japan, Ltd. Six-high rolling mill stand and finishing mill train for hot rolling an intermediate strip into a thin strip
WO2023001985A1 (en) * 2021-07-23 2023-01-26 Primetals Technologies Austria GmbH Six-high rolling mill stand and finishing mill train for hot rolling an intermediate strip into a thin strip

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EP2627464A1 (de) 2013-08-21
KR20130109157A (ko) 2013-10-07
US20130192790A1 (en) 2013-08-01
RU2579723C2 (ru) 2016-04-10
BR112013008766A2 (pt) 2019-09-24
RU2013121553A (ru) 2014-11-20
KR101809108B1 (ko) 2018-01-18
EP2627464B1 (de) 2016-03-23
CN103228377A (zh) 2013-07-31
WO2012049135A1 (de) 2012-04-19
US9296027B2 (en) 2016-03-29

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