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EP2441538A1 - Dispositif de coulée continue doté d'une réduction de barre dynamique - Google Patents

Dispositif de coulée continue doté d'une réduction de barre dynamique Download PDF

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Publication number
EP2441538A1
EP2441538A1 EP10187201A EP10187201A EP2441538A1 EP 2441538 A1 EP2441538 A1 EP 2441538A1 EP 10187201 A EP10187201 A EP 10187201A EP 10187201 A EP10187201 A EP 10187201A EP 2441538 A1 EP2441538 A1 EP 2441538A1
Authority
EP
European Patent Office
Prior art keywords
strand
thickness
guiding device
mold
casting
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Withdrawn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
EP10187201A
Other languages
German (de)
English (en)
Inventor
Gerald Hohenbichler
Josef Watzinger
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 EP10187201A priority Critical patent/EP2441538A1/fr
Priority to PCT/EP2011/067621 priority patent/WO2012049105A1/fr
Priority to RU2013120989/02U priority patent/RU137488U1/ru
Priority to CN201190000793.7U priority patent/CN203470858U/zh
Publication of EP2441538A1 publication Critical patent/EP2441538A1/fr
Withdrawn legal-status Critical Current

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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
    • B22D11/16—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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method for the continuous casting of steel in a casting plant, wherein a emerging from a mold strand in the liquid core reduction (LCR) method is reduced in thickness by means of a subsequent strand guiding device at liquid cross-sectional core of the strand, wherein the strand one between the meniscus , ie The bath level of the mold and an end of the strand guiding device facing away from the mold, system-specific strand support length with a casting speed passes, according to claim 1 and a corresponding system for performing this method according to claim 13.
  • LCR liquid core reduction
  • a liquid steel strand emerging from a mold of a casting plant is passed through a strand guiding device directly adjoining the mold.
  • the strand guiding device also referred to as "strand guiding corset”
  • the strand guiding device comprises a plurality (usually three to fifteen) guiding segments, each guiding segment comprising one or more (usually three to ten) pairs of guiding elements, preferably designed as strand supporting rollers.
  • the support rollers are rotatable about an axis orthogonal to the transport direction of the strand.
  • these are arranged on both sides of the strand broad sides, so that the strand is guided by upper and lower guide element series.
  • the strand is supported not only by the strand guiding device, but also by a lower end portion of the mold, which is why you have to view the mold as part of the entire strand guiding device.
  • the Strangerstarrung begins at the upper end of the (run) kokille at the bath level, the so-called "meniscus", the mold is typically about 1m long (0.3 - 1.5m).
  • the strand emerges substantially vertically downwards from the mold and is deflected into the horizontal.
  • the strand guiding device therefore has a course substantially curved over an angular range of 90 °.
  • Each casting installation has a structurally determined strand support length L passed through by the strand at a casting speed v c , which is measured between the meniscus and an end of the strand guiding device facing away from the mold.
  • Known CSP® plants for steel hot strip production have approximately strand support lengths L of 9-13 m.
  • the strand support length L is a static, plant-specific size and can not be modified by short-term change measures.
  • the expansion and use of a kokillenfernen last strand guide segment by a simple roller table (not yet realized) would normally take several days.
  • the strand emerging from the strand guiding device can subsequently be reduced in thickness or finish rolled in any number of rolling stands.
  • the present invention for optimized continuous casting can be used in known cast-rolled composite plants.
  • the emerging from the strand guide strand is first separated by means of a separation device into individual slabs or rolled without separation in a subsequent roughing train to an intermediate strip and subsequently rolled after reheating or keeping warm in a heating device in a finishing train to a final strip.
  • the strand is reduced in thickness, the resulting intermediate strip is heated by means of a heater before it enters the finishing train.
  • 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.
  • Decisive parameters in the production process of steel hot-rolled strip-casting systems are the casting speed with which the strand leaves the mold (and passes through the strand guide device) and the width-specific mass flow rate, which is given as the product of the casting speed with the thickness of the strand and usually the unit [mm * m / min] carries.
  • the steel strips produced are processed, inter alia, for motor vehicles, household appliances and the construction industry.
  • the present invention relates to the casting of strands or slabs of all thicknesses and is therefore applicable to the production of both thin slabs ( ⁇ 80 mm), medium and thick slabs (> 150 mm).
  • the present invention is further applicable to both continuous and semi-continuous production of steel hot strip.
  • continuous rolling when a casting plant is connected to a rolling mill, that cast in the mold of the casting line directly - without separation from the straight cast strand part and without intermediate storage - led into the rolling mill and there on one each desired final thickness is rolled.
  • the beginning of the strand can already be finished rolled to a steel strip to the final thickness, while the casting plant continues to pour on the same strand, so there is no end of the strand (except on the meniscus in the mold) exists.
  • 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.
  • AT 401 744 discloses a continuous casting apparatus with liquid core reduction.
  • the strand guiding device forms between the guide elements or the strand support rollers a partially curved receiving shaft for receiving the freshly cast (still having a liquid core) strand.
  • 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 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 (in the geometric strand cross-section center) therefore corresponds to the solidus temperature of the respective steel grade (typically between 1300 ° C and 1535 ° C).
  • Soft-reduction devices are used only in a region of the strand in which the strand cross-section is consistently doughy or solid, i. practically has no pronounced liquid central area more.
  • a pronounced liquid central region is absolutely necessary.
  • the sump tip d.i. the just doughy-liquid cross-sectional core of the strand conveyed in the strand guiding device is always as far away as possible from the mold and as close to the end of the strand guiding device and thus - in the case of a casting-rolling composite - as close as possible to the entrance to the roughing mill.
  • the casting speed or the Strand guiding device passing, wide-specific volume flow may not be too large, since in such a case could shift out of the sump tip beyond the strand guide device and thus bulging and possibly even bursting of the strand could take place.
  • Claim 1 is directed to a process for the continuous casting of steel in a casting plant, wherein a strand emerging from a mold in the liquid core reduction (LCR) process by means of a subsequent strand guiding device at liquid cross-sectional core of the strand is reduced in thickness, wherein the strand one between the meniscus, ie the bath level of the mold and an end of the strand guiding device facing away from the mold, system-specific strand support length L passes through with a casting speed v c .
  • LCR liquid core reduction
  • the strand thickness d is adjusted dynamically by means of adjustable guide elements of the strand guiding device, ie several times and as often as desired during the casting process or during the passage of the strand through the strand guiding device (eg at least 2 times per casting sequence or at least 1 additional time via initial Strangdicken-Einstellvorêt addition during the Ang manphase, with the starting phase is usually understood as the first 5-15 minutes of a casting sequence or the time to fill the strand support length 0.8 to 2 times with hot steel strand) is varied so that between the measured at the end facing away from the mold end of the strand guide device strand thickness d and the (also measured at the end of the strand guiding device) casting speed v c depending on the system-specific Strand support length L for more than 75%, preferably for more than 90% of the operating time of the casting plant (operating time refers to a casting sequence, eg during a shift or daytime operation at regular plant utilization) following by operating coefficients a, in particular by a minimum operating
  • the minimum operating coefficient is a min 2050, preferably 2400 and the maximum operating coefficient a max 2850, preferably 2800.
  • the strand support length L is in the unit [m], the strand thickness d in the unit [mm] and the casting speed v c in the unit [m / min] indicated.
  • the indication of the above mentioned units refers to a hypothetical indication, not to actual measurement results or to quantities necessarily handled in specific casting plants. It goes without saying that the parametric variables of the inequality conditions according to the invention: a min * (L / d 2 ) ⁇ v c ⁇ a max * (L / d 2 ) can be determined in arbitrary alternative units, in particular can be measured on the system. However, to uniquely define operating coefficients of the invention, reference to reference units is essential.
  • the unit [mm] for the strand thickness d and the unit [m / min] for the casting speed v c is followed by a reduction of the factors of the unit [mm 2 / min] for the operating coefficients a.
  • the operating coefficients a min and a max when specifying or measuring strand support length, strand thickness and casting speed in units other than [m], [mm] and [m / min] in an alternative unit or as of the Nominally deviating values can be specified according to the values indicated according to the invention.
  • the strand thickness (up to approximately the thickness of the mold outlet) can henceforth be increased, except during the gating phase, during operational or quality-related lowering of the casting speed, without interrupting the casting process.
  • the dynamic strand thickness reduction according to the invention while maintaining the conditions defined by the above inequalities, on the one hand ensures high manufacturing quality by always reaching the bottom tip of the strand close to the end of the strand guiding device, despite the maximum material casting-dependent maximum casting speeds. On the other hand, the throughput of the plant can be maximized.
  • the casting heat can be optimally utilized to increase the efficiency of subsequent rolling processes of a casting-rolling composite.
  • a strand emerging from the strand guiding device according to the invention has a sufficiently hot cross-sectional core during its further reduction in thickness in a rough rolling mill downstream of the strand guiding device to be rolled with relatively little energy expenditure, in particular if the rolling process is not later than four minutes later, preferably not later than two minutes after strand solidification begins.
  • the sump tip of the strand lies in the last third of the suture, preferably in the last quarter, preferably in the last fifth of the strand guiding device or strand support length L.
  • the preservation of the highest possible strand energy content proves to be a significant advantage, especially in continuous composite processes, which allows a throughput improvement of up to 35% in phases of reduced casting speed (eg if the strand thickness is increased dynamically from about 65-70 mm to 95 mm; in that the strand at the mold outlet is ⁇ 95 mm thick).
  • the following also applies:
  • the (reference) time period for a lowering of the casting speed v c regarded as necessary for operation is thus determined as the quotient of a division in which the strand support length L forms the dividends and the casting speed v c forms the divisor, L being in the unit [m] and v c in the unit [m / min] can be used.
  • the strand support length L in a range of 9 to 30 m, preferably in a range of 11 to 23 m.
  • the casting speed v c is in a range of 3.8 to 7.2 m / min.
  • the strand is reduced in thickness by 5 to 40%, preferably by 5 to 30%, particularly preferably by 5 to 25%.
  • the strand is reduced in thickness by 5 to 40 mm, preferably by 5 to 30 mm, particularly preferably by 10 to 25 mm.
  • the strand can be reduced to a strand thickness between 45 and 140 mm, preferably to a strand thickness between 75 and 115 mm.
  • the strand has a casting thickness of between 180 and 450 mm, preferably between 200 and 280 mm, at the die exit.
  • the dynamic adjustment of the strand thickness by means of the guide elements of the strand guiding device in a manual manner, i. by direct or indirect action by operating personnel assigned to the device control (typically from a control station).
  • the dynamic adjustment the strand thickness is carried out by means of the guide elements of the strand guiding device in an automated manner.
  • the strand which has emerged from the strand guiding device i.e., led beyond the end of the strand guiding device) in the continuous process, i. without separation into slab pieces, in at least one roll pass by at least 30% per roll pass, preferably by at least 50% per roll pass reduced in thickness.
  • more than one rolling pass preferably at least three rolling passes are provided.
  • Claim 13 is directed to a system corresponding to the method according to the invention, comprising a mold, a subordinate strand guiding device, which has a series of lower guide elements and an oppositely arranged series of upper guide elements and between the two guide elements series for receiving a from the Comprising a strand having a casting speed v c , between the meniscus, di the bath level of the mold and a remote from the mold end of the strand guide device, plant-specific strand support length L has the strand guide device formed.
  • the minimum operating coefficient a min is 2050, preferably 2400, and the maximum operating coefficient a max is 2850, preferably 2800.
  • the strand support length (L) is in turn here in the unit [m], the strand thickness (d) in the unit [mm] and the casting speed (v c ) in the unit [m / min] given (it applies the remark to claim 1 ).
  • the strand support length L is in a range of 9 to 30 m, preferably in a range of 11 to 23 m.
  • the clear thickness of a mold outlet facing the mold guide device is between 180 and 400 mm, preferably between 200 and 280 mm.
  • the strand can be transported through the strand guiding device at a casting speed v c of 3.8 to 7.2 m / min.
  • the strand by changing the clear receiving width of the strand guiding device by 5 to 40 mm, preferably by 5 to 30 mm, more preferably by 10 to 25 mm thickness reducible.
  • the strand is preferably reduced to a strand thickness between 45 and 140 mm, more preferably to a strand thickness between 75 and 115 mm.
  • the guide elements of the strand guiding device are manually adjustable.
  • the guide elements of the strand guiding device are adjustable by an automation device according to the inequality conditions according to the invention mentioned above.
  • the strand guiding device is arranged downstream of a rough rolling mill with at least one roughing stand, in which the strand led beyond the end of the strand guiding device is processed in a continuous process, i. without separation into slab pieces, is reduced in thickness by at least 30%, preferably by at least 50%, per roughing mill, wherein the roughing mill preferably comprises at least three, particularly preferably exactly four, rough rolling stands.
  • the roughing mill is followed by a finishing train comprising four finishing mills or five finishing mills, by means of which an intermediate strip emerging from the roughing mill to an end band with a thickness of ⁇ 1.5 mm, preferably ⁇ 1 , 2 mm, more preferably ⁇ 1.0 mm can be reduced.
  • the adjustable guide elements are arranged in a front half facing the mold, preferably in a front third of the longitudinal extension facing the mold (the strand support length L) of the strand guiding device.
  • Fig.2 shows in purely exemplary manner a plant 1, by means of which a method according to the invention can be carried out.
  • the inventive method is used in plants for the continuous production of steel strands, but it can also be used in systems for the continuous or semi-continuous production of steel hot strip.
  • the mold 2 is preceded by a pan 21, which feeds a distributor 22 with liquid steel via a ceramic inlet nozzle.
  • the distributor 22 subsequently charges the mold 2, to which an in Fig.1 in detail apparent strand guide device 6 connects.
  • Fig.2 In Fig.2 can be seen how to the strand guiding device 6 from Fig.1 two rolling mills, namely a roughing 4 and a finishing train 5 can connect to the continuous production of steel hot strip.
  • the strand 3 is rolled to an intermediate thickness. During roughing, the transformation of cast structure into fine-grained rolling structure takes place.
  • the plant 1 further comprises descaling devices 23, 24 and in Fig.2 Separation devices not shown, which essentially correspond to the prior art and which is therefore not discussed in detail at this point.
  • the removal devices for example, designed in the form of high-speed shears can be used at any position of the system 1, in particular between the roughing train 4 and the Finish rolling line 5 and / or be arranged in a downstream of the finishing train 5 area.
  • a separating device preferably a pendulum scissors
  • the separating device and the inlet (the axis) of the first roughing stand is much shorter than a strand or slab length corresponding to an entire steel collar.
  • 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 executed with flame exposure.
  • plant-specific strand support length L may be in a range of 9-30 m, preferably in a range of 11-23 m.
  • the strand support length L is in this case between the meniscus 13 of the mold 2 and the axis of the last, a Vorwalz No 4 facing roller one and described in more detail below upper guide elements series 10 (viewed in a side view of Appendix 1 in parallel to the axes of the rollers Viewing direction according to Fig.2 ).
  • 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.1 a concentric to the strand support length L auxiliary dimension line L 'located.
  • a preliminary rolling of the strand 3 to an intermediate strip 3 'in at least three rolling passes, ie using three roughing stands 4 1 , 4 2 , 4 3 , preferably in four rolling passes, ie using four roughing stands 4 1 , 4th 2 , 4 3 and 4 4 .
  • the surface of the strand 3 has in this area on average a temperature> 1050 ° C, preferably> 1000 ° C on.
  • thermal cover is provided between the end 14 of the strand guide device 6 and the first roughing stand 4 1 to hold the heat as possible in the strand 3.
  • the thermal cover surrounds a conveying device provided for transporting the strand 3, usually designed as a roller table, at least in sections.
  • a conveying device provided for transporting the strand 3, usually designed as a roller table, at least in sections.
  • the end band 3 "is clamped between drive rollers 25, which also guide the end band 3" and hold it under belt tension.
  • the strand guiding device 6 comprises a plurality of predetermined for the passage of the strand 3 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.
  • a receiving shaft 11 provided for receiving a strand 2 emerging from the casting installation 2 is formed, which is tapered at least in sections in the transport direction of the strand 3 by forming different distances between opposing guide elements 9, 10 and thereby the strand 3 can be reduced in thickness.
  • the guide elements 9, 10 are designed as rotatably mounted rollers.
  • the upper and lower guide element or roller series 9, 10 can each be in turn subdivided into (sub-) series of specific rollers with different diameters and / or axial 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 140 mm to 110 mm.
  • the strand 3 e.g. 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 clear receiving width 12 is arbitrarily adjustable.
  • the setting of the strand thickness d or the clear receiving width 12 is carried out according to the invention dynamically, i. During the casting process or during the continuous quasi-stationary passage of the strand 3 by the strand guiding device 6. In the dynamic adjustment of the strand thickness d this is changed several times and as often as possible during the passage of a strand 3 through the strand guiding device 6.
  • the minimum operating coefficient is a min 2050, preferably 2400 and the maximum operating coefficient a max 2850, preferably 2800.
  • the strand support length L is given here in the unit [m], the strand thickness d in the unit [mm] and the casting speed v c in the unit [m / min]. From this follows the unit [mm 2 / min] (serving as a working hypothesis) for the operating coefficients a.
  • the strand thickness d (up to approximately the thickness of the mold outlet) can be increased without interrupting the casting process.
  • the adjustable guide elements 9, 10 are preferably arranged in one of the mold 2 facing the front half, preferably in one of the mold 2 facing the front third of the longitudinal extension of the strand guiding device 6.
  • Figure 4 For this purpose, a cross-section of a strand 3 currently located in a solidification process is shown in a schematic manner, wherein a central region 26 of the strand cross-section is still liquid and a peripheral region 28 of the strand cross-section already hatched is already solidified. Between the liquid region 26 and the solidified region 28 there is an intermediate region 27, in which the strand 3 of doughy consistency, ie neither completely liquid nor completely solid.
  • the (reference) period is thus as a quotient of a division, in which the strand support length L dividends and the casting speed v c forms the divisor, where L in the unit [m] and v c in the unit [m / min] can be used - minutes continuous lowering of the casting speed v c by more than 5%, preferably by more than 10%, within not more than 100 minutes, preferably within not more than 60 or at most 30 minutes, more preferably already after at most (2 * L / v c ) minutes after the pouring speed v c has been lowered, a casting thickness of the strand 3 measured at the end of the mold guide 6 facing away from the mold 2 is increased so that the inequality conditions a min * (L / d 2 ) ⁇ v c ⁇ a max * (L / d 2 )
  • empirical values optionally stored in an automation or regulation device 20 or by calculation models verify the expectation whether the lowering of the casting speed v c will last for a period of time defined as relevant, eg for at least 10, 15 or 30 minutes, to ensure a stable operation of the system.
  • the dynamic adjustment of the strand thickness d by means of the guide elements 9, 10 of the strand guiding device 6 can be done manually.
  • the dynamic setting is then preferably set by the operating team depending on the current casting speed, if this changes only on a case-by-case basis. If the casting speed v c falls downwards from the relationships defined in accordance with the invention or if this lower limit approaches rapidly / objectively, the operating team is informed by an output device in order to reduce the liquid core reduction (LCR) so that the strand thickness d increases and
  • LCR liquid core reduction
  • this function can also by a in Fig.1 schematically drawn automation device 20 are taken over, especially if relatively frequent changes in thickness or speed would be common or required.
  • the guide elements 9, 10 of the strand guiding device 6 by the automation device 20 according to the above-mentioned inequation conditions according to the invention adjustable.
  • the automation device 20 is a processor-controlled control device.
  • the automation device 20 is able to drive any number of guide elements 9, 10 and guide segments 16 selectively or in combination.
  • Control and regulation activities of the automation device 20 can be carried out both on the basis of process-related sensors that are in data communication with one another as well as through calculations and simulations.
  • An intelligent operation of the automation device 20 can be made possible, in particular, by program logics based on plant-specific empirical values stored in a memory device and on principles of "fuzzy logic".
  • the casting speed v c of the plant is preferably in a range of 3.8 to 7.2 m / min.
  • the strand 3 is reduced in thickness by 5 to 40%, preferably by 5 to 30%, particularly preferably by 5 to 25%.
  • the strand 3 is 5 to 40 mm, preferably 5 to 30 mm, most preferably reduced by 10 to 25 mm thickness.
  • the strand thickness d measured at the end 14 of the strand guiding device 6 is thus 15 to 30 mm lower than at a mold outlet facing the strand guiding device 6.
  • the strand 3 can in this case be reduced to a strand thickness d between 45 and 140 mm, preferably to a strand thickness d between 75 and 115 mm.
  • the strand 3 has a casting thickness between 180 and 450 mm, preferably between 200 and 280 mm, at the mold outlet.
  • Strand guide device 6 has emerged (i.e., led beyond the end 14 of the strand guide device) in the continuous process, i. without separation into slab pieces, in at least one roll pass by at least 30% per roll pass, preferably by at least 50% per roll pass reduced in thickness.
  • At least three rolling passes are provided.
  • the roughing train 4 comprises at least three, particularly preferably exactly four rough rolling stands 4 1 , 4 2 , 4 3 , 4 4 .
  • the Vorwalz Node 4 downstream of an already mentioned finishing train 5, which four finishing mills 5 1 , 5 2 , 5 3 , 5 4 or five finishing mills 5 1 , 5 2 , 5 3 , 5 4 , 5 5 comprises, by means of which one the pre-rolling 4 emerging intermediate band 3 'to an end band 3 "with a thickness ⁇ 1.5 mm, preferably ⁇ 1.2 mm, more preferably ⁇ 1.0 mm is reducible.
  • lines 29 and 30 correspond to operations in accordance with those in the inequality a min * L / d 2 ⁇ v c ⁇ a Max * L / d 2 mentioned (preferred) minimum operation coefficients a min, while the lines 31 and 32 operating in accordance with the maximum guides (preferred) Operating coefficients a max correspond.
  • the present diagrams can also be used to determine the strand thickness d, with which it is possible at a given strand support length L and casting speed v c operation of the system in the range of throughput optimum.
  • the system can also be throttled Casting speed v c are operated in the range of their throughput optimum:
  • Line 36 illustrates multipoint control which results in a zigzag line.
  • Line 37 illustrates a rectilinear regulation in a casting speed range between 7 and 4.2 m / min or in a strand thickness range between 94.5 and 120 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
EP10187201A 2010-10-12 2010-10-12 Dispositif de coulée continue doté d'une réduction de barre dynamique Withdrawn EP2441538A1 (fr)

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EP10187201A EP2441538A1 (fr) 2010-10-12 2010-10-12 Dispositif de coulée continue doté d'une réduction de barre dynamique
PCT/EP2011/067621 WO2012049105A1 (fr) 2010-10-12 2011-10-10 Dispositif de coulée continue à réduction dynamique de l'épaisseur de la barre
RU2013120989/02U RU137488U1 (ru) 2010-10-12 2011-10-10 Устройство для непрерывного литья с динамическим сокращением толщины сляба
CN201190000793.7U CN203470858U (zh) 2010-10-12 2011-10-10 用于在浇铸设备中对钢进行连铸的设备

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AT512399B1 (de) * 2012-09-10 2013-08-15 Siemens Vai Metals Tech Gmbh Verfahren zum Herstellen eines mikrolegierten Röhrenstahls in einer Gieß-Walz-Verbundanlage und mikrolegierter Röhrenstahl
WO2015000968A1 (fr) * 2013-07-03 2015-01-08 Sms Siemag Ag Installation de laminage de coulée continue et procédé de fabrication de produit laminé métallique
WO2016128149A1 (fr) * 2015-02-13 2016-08-18 Sms Group Gmbh Installation de coulage
CN108435793A (zh) * 2018-04-09 2018-08-24 钢铁研究总院华东分院 一种耐磨球用钢的带液芯轧制生产工艺
WO2019086192A1 (fr) * 2017-10-30 2019-05-09 Sms Group Gmbh Installation de coulée continue à réglage de cylindres individuels
IT202200006581A1 (it) * 2022-04-04 2023-10-04 Danieli Off Mecc Segmento di un dispositivo di soft reduction per eseguire una soft reduction di bramme

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BR112015008906B1 (pt) 2014-12-24 2021-06-22 Jfe Steel Corporation Método de lingotamento contínuo de aço
TWI580496B (zh) * 2014-12-25 2017-05-01 Jfe Steel Corp Continuous Casting of Steel
AT519277A1 (de) * 2016-11-03 2018-05-15 Primetals Technologies Austria GmbH Gieß-Walz-Verbundanlage
CN110548847B (zh) * 2019-09-20 2021-07-09 本钢板材股份有限公司 一种连铸机在中包快换期间扇形段自动躲接痕板坯的方法
CN114160767B (zh) * 2021-11-19 2023-08-22 上海二十冶建设有限公司 一种采用遍历法确认连铸设备的安装基准线的布置方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512399B1 (de) * 2012-09-10 2013-08-15 Siemens Vai Metals Tech Gmbh Verfahren zum Herstellen eines mikrolegierten Röhrenstahls in einer Gieß-Walz-Verbundanlage und mikrolegierter Röhrenstahl
AT512399A4 (de) * 2012-09-10 2013-08-15 Siemens Vai Metals Tech Gmbh Verfahren zum Herstellen eines mikrolegierten Röhrenstahls in einer Gieß-Walz-Verbundanlage und mikrolegierter Röhrenstahl
US9144839B2 (en) 2012-09-10 2015-09-29 Primetals Technologies Austria GmbH Method for producing microalloyed tubular steel in combined casting-rolling installation and microalloyed tubular steel
WO2015000968A1 (fr) * 2013-07-03 2015-01-08 Sms Siemag Ag Installation de laminage de coulée continue et procédé de fabrication de produit laminé métallique
CN105492140A (zh) * 2013-07-03 2016-04-13 Sms集团有限公司 铸造轧制设备和用于制造金属轧件的方法
WO2016128149A1 (fr) * 2015-02-13 2016-08-18 Sms Group Gmbh Installation de coulage
WO2019086192A1 (fr) * 2017-10-30 2019-05-09 Sms Group Gmbh Installation de coulée continue à réglage de cylindres individuels
CN108435793A (zh) * 2018-04-09 2018-08-24 钢铁研究总院华东分院 一种耐磨球用钢的带液芯轧制生产工艺
IT202200006581A1 (it) * 2022-04-04 2023-10-04 Danieli Off Mecc Segmento di un dispositivo di soft reduction per eseguire una soft reduction di bramme
WO2023194868A1 (fr) * 2022-04-04 2023-10-12 Danieli & C. Officine Meccaniche S.P.A. Segment d'un dispositif de réduction douce pour réaliser une réduction douce de dalles

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