EP1113888B1 - Procede et installation de production d'une bande d'acier laminee a chaud a partir d'une masse d'acier en fusion - Google Patents

Procede et installation de production d'une bande d'acier laminee a chaud a partir d'une masse d'acier en fusion Download PDF

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Publication number
EP1113888B1
EP1113888B1 EP99927572A EP99927572A EP1113888B1 EP 1113888 B1 EP1113888 B1 EP 1113888B1 EP 99927572 A EP99927572 A EP 99927572A EP 99927572 A EP99927572 A EP 99927572A EP 1113888 B1 EP1113888 B1 EP 1113888B1
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EP
European Patent Office
Prior art keywords
rolling
strip
continuous casting
roll
melt
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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.)
Expired - Lifetime
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EP99927572A
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German (de)
English (en)
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EP1113888A1 (fr
Inventor
Andreas Flick
Clifford Job
Gernot Lettmayr
Olaf Silbermann
Josef Watzinger
Josef LANSCHÜTZER
Franz Wimmer
Josef Maierl
Gerlinde Djumlija
Heinrich THÖNE
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Primetals Technologies Austria GmbH
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Voest Alpine Industrienlagenbau GmbH
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Publication of EP1113888A1 publication Critical patent/EP1113888A1/fr
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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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands

Definitions

  • the invention relates to a method and a plant for the production of hot-rolled Steel strip from a molten steel using a single or multi-stand Continuous caster and its downstream rolling devices.
  • Direct composite systems made up of a casting plant and a rolling plant for Direct rolling of thin slabs enables the production costs to be reduced Utilization of the casting heat and thus the minimization of the re-heating amounts of energy to be applied. Furthermore, the production capacity of the rolling mill fully used by maximizing the continuous casting capacity by z. B. Two-strand casting plants be used. The economic limit of such systems is today already with production quantities of more than 2 million t / year and a corresponding investment is increasingly unrealistic due to the lack of sales markets.
  • the one with the development of Direct composite systems started the trend towards the production of tapes close to final dimensions continues with the aim of thin hot strips in one thickness range and with one To produce a quality standard that can be used as a cold strip substitute on the markets. With a final hot strip thickness of 0.6 to 12.0 mm and correspondingly cheaper Plant design becomes possible in this way, small production quantities from 0.8 to 1.2 Million tons / year to produce economically.
  • DE 195 20 832 Al already discloses a method and an apparatus for the production of steel strip with cold rolling properties known, one from the continuous casting mold Cast strand with an outlet thickness of 30-100 mm and in three subsequent conveyed Deformation steps, namely a deformation with the core still liquid by at least 10%, a subsequent rolling with a thickness reduction of at least 50% in one three-stand rolling mill and a final isothermal rolling in one as well at least three-stand finishing train, to a finishing strip of maximum 2 mm thickness is rolled out.
  • a major disadvantage of this known solution is the large number of deformation frameworks for forming the cast strand while the core is still liquid and the subsequent large number of roll stands in order to reach the desired strip target thickness come.
  • EP 0 541 574 B1 is a method and a plant for producing a finished strip with cold rolling properties, this strip being produced directly in a hot rolling mill from a starting material produced by continuous casting.
  • the cast thin slab strand leaves the continuous casting mold with a maximum thickness of 100 mm. No information is given on the minimum possible casting thickness.
  • This process has the defect that many roll stands and roll passes are necessary in order to achieve the desired strip target thickness and thus a complex temperature control is also necessary.
  • the object of the invention is therefore to avoid these disadvantages and a method and Plant for the production of hot-rolled steel strip from a molten steel to propose, with which it is possible with a minimum of rolling passes and Roll stands, as well as a minimal effort in temperature control measures a hot strip with a low strip target thickness.
  • Another object of the invention is that the installation costs of such a system by reducing the Number of units, especially the roll stands and the associated ones Auxiliary units can be drastically reduced.
  • Another object of the invention is quality of the product produced, in particular the development of surface defects on the To avoid cast strand.
  • an at least partially solidified cast strand with a strand thickness of 15 to 50 mm to convey whose thin strand shell during their education phase in the Continuous casting mold not forced by the shape of the mold inner walls is subject to harmful deformations, as is the case with continuous casting molds is when for the immersion pouring tube protruding into the continuous casting mold on the input side funnel-shaped expansion space is provided and this expansion is still within the continuous casting mold or in the continuous casting mold and the subsequent strand guide the warm thickness dimension of the cast strand, which is outside the expansion area is set, is returned.
  • the free jet casting process is a way of introducing melt into the mold cavity of a continuous casting mold, in which the from an outlet opening
  • the pouring jet emerging from the melt container is protected against oxidizing influences of the surrounding atmosphere through an isolation chamber with a protective gas atmosphere and without Guided tour through a dip tube in free fall into the contained in the continuous casting mold immersed in a mold forming the mold.
  • This dip molding process is for example from US-A 3,833,050, US-A 3,840,062 and JP-A 48-9251 known and described in detail there.
  • these use cases are limited on the casting of strands with square, rectangular, polygonal or round Billet cross sections.
  • the cooling section offers the possibility depending on the strip thickness and steel quality specifically Drive cooling programs to the desired structure and material properties adjust.
  • a particularly favorable application in terms of investment costs and strip quality results when the at least partially solidified cast strand with a strand thickness of 20 to 40 mm is promoted.
  • the cast strand is rolled into a steel strip in at least one Rolling stage.
  • the rolling sequence is the immediately successive sequence of several Understand rolling passes.
  • An advantageous embodiment of this roll forming in two rolling stages is distinguished characterized in that a first roll forming of the cast strand into a pre-strip in a first rolling stage with a degree of deformation of 10 to 75% and that a further, second roll forming into a steel strip in a second rolling stage immediately in Connection to a case-by-case heating of the pre-strip to the rolling temperature.
  • Free jet casting achieves a low casting thickness which enables rapid solidification of the cast strand and thus a high casting speed.
  • the pre-strip is heated immediately before the second roll forming does not rule out that between these two Treatment steps a descaling of the pre-strip takes place, like this for Avoiding scaling is common.
  • the pre-strip formed by the first roll forming of the cast strand before the second Roll forming, if necessary before heating up to the rolling temperature predetermined coil weights is cut to length.
  • heating of the pre-strip in the Intermediate storage station is characterized in that the pre-cut to length wound up into a bundle in an intermediate storage station, possibly stored, heated to rolling temperature, unwound and fed to the second roll forming.
  • the investment costs are minimized if the second roll is formed by Reversing rolls are done.
  • the steel strip produced by roll forming is cooled down cut to length in the cooling section (23) according to predetermined coil weights.
  • Optimal conditions for rolling deformation arise when the casting speed is set to values from 3 to 12 m / min.
  • the high values of the casting speed are due to the rapid solidification of the cast strand with a low casting thickness enabled and improved by an oil lubrication in the continuous casting mold.
  • the Steel melt in the form of a pouring stream under a protective gas atmosphere in the Continuous casting mold enters.
  • the protective gas atmosphere is created by at least one inert gas or forming gas is formed.
  • the continuous shell forming the continuous shell has none or none within the continuous casting mold exposed to harmful deformations.
  • the choice of cross-sectional shape itself is one of them untouched and can be chosen arbitrarily, so that it is quite possible, for example To produce cast strands in which the strand thickness decreases towards the edges.
  • Essential is only that either the selected cross-sectional format or the selected total scope of the Cast strand within the continuous casting mold from the location of the strand shell to Exit from the continuous casting mold is maintained unchanged, so that no harmful Deformations and the resulting deformation forces from the mold walls to the Strand shell are exercised.
  • An essential influencing variable is a constant one Casting level in the continuous casting mold.
  • An advantageous embodiment consists in the fact that the molten steel is one before being introduced into the continuous casting mold Inflow chamber and an outflow chamber connected to it by channels Flows through the melt container and that of the molten steel in the two chambers formed melt level at least in one of the two chambers by adjusting the Chamber pressure is regulated in height.
  • a preferred embodiment results if the Melt level in the outflow chamber via the melt flow in the channels is regulated in height and the level of the melt level in the inflow chamber is constant is held.
  • a possible advantageous embodiment is that the rolling device from one multi-skeleton finished series is formed.
  • the continuous caster is at least two Downstream of rolling devices, wherein a first rolling device of at least one Roll stand is formed for forming a cast strand into a pre-strip and this a second rolling device for forming the pre-strip into a hot-rolled Steel strip is arranged downstream, this second rolling device optionally provided heating stage for the pre-strip is immediately upstream.
  • a first rolling device of at least one Roll stand is formed for forming a cast strand into a pre-strip and this a second rolling device for forming the pre-strip into a hot-rolled Steel strip is arranged downstream, this second rolling device optionally provided heating stage for the pre-strip is immediately upstream.
  • Those are preferred Roll stands of the first rolling device formed by duo stands.
  • the rolling stands of the first rolling device are formed by four-high stands.
  • the first rolling device is still to be assigned to the continuous casting installation, since it is operated at a rolling speed which corresponds to the casting speed of the cast strand and accordingly has measuring and control devices which enable the casting and rolling speed to be synchronized.
  • the roll stands of the first rolling device are advantageously formed by duo stands. When using a roll stand, which is preferably designed as a duo stand, degrees of deformation of up to 50% are achieved. In the case of two rolling stands, which are preferably formed by two duo stands, degrees of deformation of up to 75% are to be applied to the cast strand.
  • the first rolling device To cut the pre-strip according to the specified coil weights, the first rolling device, a separating device for the pre-strip, preferably scissors, downstream.
  • the blades of these scissors are with mechanical or hydraulic drives connected.
  • the upper knife is roof-shaped to reduce the cutting forces, whereby the cutting forces occurring at cutting temperatures of approx. 1200 ° C be kept correspondingly low.
  • a buffer station for the pre-strip arranged, which is provided with a winding and an unwinding station.
  • a possible Embodiment of such a coiler is in detail in AT-B 403 169 described.
  • the two are essentially arranged one above the other Reel mandrels alternately used as winding and unwinding stations. additionally there is the possibility of the winding and unwinding station, if necessary also the Train reel mandrels to be heatable.
  • Transverse transport system for example a coil transport trolley for inserting bundles provided from the second casting line into the rolling line.
  • the second rolling device is one Multi-stand finishing train with a descaling device upstream educated.
  • the strip target thickness can be achieved if the first rolling device is formed by a rolling stand, preferably a duo stand, and it the strip target thickness can be achieved with the use of two or three roll stands, if two roll stands, preferably duo stands, are used as the first rolling device become.
  • the second rolling device of a reversing roll stand with at least one each of these reversing roll stands subordinate reel furnace formed.
  • the number of reversing stitches depends on the Number of reversing stands and the target strip thickness.
  • An improvement in the rolled product is further achieved in that a Descaling device upstream of the first rolling device.
  • An improvement of the Rolled product also occurs when the first rolling device has a heating stage is upstream.
  • the heating stage for the pre-strip is integrated. This can be done by a heating device arranged in the reel space and optionally in addition to it a heated reel mandrel. But it is also possible that the Strip exit opening of the reel furnace forming hot strip guide with a To equip the heating device as already described in AT-B 403 169.
  • An improvement in quality on the hot-rolled steel strip occurs when the (the) for Generation of a steel strip provided rolling device (s) another at least downstream of a finishing stand formed as a skin pass rolling device is.
  • a particularly simple embodiment of the continuous casting mold in terms of production technology results itself when the mold cavity of the continuous casting mold is made up of two broad side walls and two Narrow side walls is formed, the mold cross-section has a rectangular shape and the the two broad side walls are 15 to 50 mm apart, preferably 20 to 40 mm apart are arranged.
  • the mold cavity is the Continuous casting mold made up of two broad side walls and two narrow side walls, the Mold cavity cross section has a concave at least in its central region Extension to and the two broad side walls are in the area of the mold outlet 15 to 50 mm apart, preferably 20 to 40 mm apart.
  • the melt container contains a sealed inflow chamber and a sealed outflow chamber
  • the inflow chamber and the outflow chamber are through at least one positioned below the melt level in the two chambers Channel connected and the inflow chamber and the outflow chamber are with facilities equipped to regulate the casting level in the continuous casting mold.
  • the inflow chamber and the outflow chamber Pressure control devices connected.
  • melt container To keep the temperature of the molten steel in the melt container constant and The melt container enables the casting operation in the area close to the liquidus Heaters assigned.
  • Fig. 1 shows a first embodiment of an inventive Compound system with continuous belt run using a multi-stand Finishing mill in direct assembly
  • Fig. 2 shows a second embodiment of an inventive Compound system using an intermediate storage station in front of a multi-stand Finishing mill
  • Fig. 3 shows a third embodiment of a composite system according to the invention using a one or two stand reversing rolling mill.
  • Figure 4 illustrates the devices according to the invention for introducing the melt into the continuous casting mold according to the free jet casting process.
  • Fig. 1 of a composite system with continuous Belt pass is for the production of a steel strip with a final strip thickness of 0.6 to 12.0 mm in usual bandwidths, for example 600 to 2000 mm, with a casting thickness from 15 to 50 mm, preferably 20 to 40 mm, and in this system design suitable for continuous rolling starting from a single-strand casting machine.
  • the molten steel is fed into the actual continuous casting installation 1 via a trough-like distributor 2 with a capacity of approx. 18 t, the weir and Dam internals contains the corresponding residence times of the molten steel, as well as that Separation of non-metallic inclusions in the floating on the molten steel Ensure distribution slag.
  • a plug control 3 The steel melt exits through a pouring tube 5 into a closed pure steel vessel trained melt container 4, which is shown in detail in Fig. 4.
  • This Pure steel vessel is through an intermediate wall 6 in an inflow chamber 7 and in a Outflow chamber 8 divided, the introduced into the inflow chamber 7 Steel melt through the intermediate wall 6 in the near-penetrating channels 9 in the Outflow chamber 8 is transferred.
  • the molten steel passes through several of floor nozzles formed melt outlet openings 10, which are both round, oval and rectangular Can have cross-section from the pure steel vessel.
  • Heaters 41 am Pure steel vessels ensure casting in the liquidus-near temperature range for the positive Influencing the strand center. Inert gas or forming gas overpressure in the clean steel vessel prevents the suction of atmospheric oxygen. Through these measures, the purity of the steel to be cast, as well as the internal quality of the cast strand is positively influenced.
  • the molten steel enters the mold cavity 12 in the form of a pouring jet 11 Continuous casting mold 13 and immersed in the casting level of those already accumulated there Molten steel.
  • the pouring jet is through a bellows forming a sealing shield 14, which the Connects pure steel vessel with the continuous casting mold, protects against reoxidation, this sealed space 15 is kept under inert gas or forming gas pressure and is connected to a protective gas line, not shown, which opens into it.
  • the Bellows are opened for the period of the start-up process, then automatically closed and remains closed during normal operation.
  • the mold cavity of the continuous casting mold is straight, plane-parallel or curved Broad side walls and conical or multi-conical employees Narrow side walls formed, the narrow side taper during the casting operation are adjustable according to different strand shrinkages.
  • the continuous casting mold is designed as a quick-change cassette. Temperature monitoring, e.g. for early breakthrough detection is about Temperature sensors in the copper plates ensured.
  • a hydraulic one The mold oscillation device enables the stroke to be adjusted during operation, Frequency and shape to achieve different oscillation modalities and good ones Strand surfaces.
  • the cast strand G passes through a Strand guide 16 in which it from the vertical discharge direction from the continuous casting mold in the horizontal is deflected and the rolling treatment is stirred.
  • the strand guide can both as a bending-arch straightening unit or, as shown, also as a vertical bending-arch straightening unit be executed. It usually consists of two segments.
  • the System radius R is usually in the range of 1000 to 3000 mm.
  • the cast strand G enters the first, Rolling device 17 shown in dashed lines, which is formed by two duo stands 18 and there is a first roll deformation to a pre-strip V with a Subject to a total degree of deformation of 10 to 75%, with a strip thickness of approx. 6 to 30 mm is reached.
  • the first rolling device 17 also works as a pull-out device for the cast strand and as a roughing device, with a structural separation into two Single units is also within the scope of the present invention.
  • edge preheating before the first rolling device is necessary to ensure even To guarantee a rolling temperature of approx. 1200 ° C also at the strip edges.
  • the downstream second rolling device is followed by a pair of scissors trained separating device 19.
  • the pre-strip is passed through a heating stage 20, in which it reaches a rolling temperature is heated from approx. 1000 to 1250 ° C.
  • a second rolling device 21 formed by a multi-stand finishing train F1, F2, ... with an upstream highly efficient descaling device 22 introduced.
  • the Descaling device 22 is preferably a rotor descaling that has a high Impact pressure allows with small amounts of water.
  • the cooling section 23 is in a main cooling section and in a precision cooling section (not shown) subdivided and offers the possibility of required different mechanical - technological target values for different types of steel.
  • the Acquisition of the current temperatures with appropriate measuring systems and the integration thermo-mathematical cooling models enable optimal temperature control.
  • FIG. 1 shows two possible embodiments of the composite system according to the invention: in the first embodiment, the first rolling device 17 is omitted; the remaining second rolling device 21, now the only rolling device, consists of up to five-stand finishing series F1, F2, F3, ...
  • the second embodiment consists of a one- or two-stand first rolling device 17 and a multi-stand second rolling device 21.
  • 2 shows an embodiment of a composite system according to the invention, which has the following differences in the system configuration compared to the embodiment known from FIG.
  • each casting strand is assigned a winding station 27 and a removal station 28, as well as a coil carriage (not shown) for introducing the bundles into the rolling line 29.
  • a temperature homogenization takes place in the intermediate storage station 26, which may be amplified by a heating device.
  • the casting and the rolling process are decoupled, as a result of which the feed speed of the pre-strip to the second rolling device 21 can be selected independently of the casting speed and thus faster.
  • FIG. 3rd Another embodiment of the composite system according to the invention, in which the second Rolling plant 21 from a reversing roll stand 30 or optionally from two in the manner of one Tandem mill interacting reversing roll stands 30, 31 is formed from Fig. 3rd can be seen in a schematic representation. 3 also shows several variants of one Compound system, its core facilities of a casting plant and a Reversing roll stand are formed.
  • the reversing roll stands 30, 31 each have a coiler 32, 33 upstream and downstream.
  • a casting installation, as already described in the description of FIG. 1 is described in detail, with case-by-case duo-roll stands 18 being the first Rolling device 17 connected. In front of the first rolling device 17 is a highly efficient one Descaling 34 positioned.
  • a heating level 35 e.g. a short heating distance or an edge heating device using gas burners is only in exceptional cases Faults or special steel qualities or small hot strip end thicknesses, necessary.
  • the pre-strip is cut with scissors 19 in one Intermediate storage station 26 wound into a bundle.
  • the staging station consists of a reel furnace with two stacked or Unwinding stations 38.
  • the rolled pre-strip is now removed from the active mandrel Haspelofens 38 unwound, passes through the reversing stand 21 and is in opposite reel furnace 33 wound up again.
  • the end of the strand is cut with scissors 39 separated to create an ideal tapping cross-section for the next roll pass.
  • the second roll pass and end cut is then carried out with the scissors 39a in the return.
  • the hot-rolled steel strip runs through if necessary up to two finishing stands 40 working as skin pass stands before it goes into the downstream Cooling section 23 occurs and is then wound up in the coiler 24.

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  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Claims (38)

  1. Procédé pour la fabrication d'une bande d'acier laminée à chaud à partir d'un acier en fusion, se composant des étapes suivantes se succédant dans le temps:
    introduction continue d'un acier en fusion dans une lingotière de coulée continue (13) oscillante refroidie suivant le procédé de coulée à jet libre, dans lequel jet de coulée est protégé contre les influences atmosphériques,
    extraction d'une barre coulée au moins en partie solidifiée (G) hors de la lingotière de coulée continue (13), avec une épaisseur de barre de 15 à 50 mm,
    éventuellement, réchauffage de la barre de coulée à la température de laminage dans un étage de réchauffage (20) immédiatement avant une déformation par laminage de la barre coulée,
    déformation par laminage de la barre coulée en une bande d'acier laminée à chaud avec une épaisseur finale de bande de 0,6 à 12,0 mm, en plusieurs passes de laminage,
    refroidissement de la bande d'acier (S) dans une section de refroidissement (23) installée à la suite et enroulement de la bande dans une installation de bobinage (24).
  2. Procédé suivant la revendication 1, caractérisé en ce que la barre coulée au moins en partie solidifiée est extraite hors de la lingotière de coulée continue avec une épaisseur de barre de 20 à 40 mm.
  3. Procédé suivant l'une ou l'autre des revendications 1 ou 2, caractérisé en ce que la déformation par laminage de la barre coulée en une bande d'acier se déroule en au moins une étape de laminage.
  4. Procédé suivant la revendication 3, caractérisé en ce qu'une première déformation par laminage de la barre coulée en une ébauche de bande (V) se déroule dans une première étape de laminage avec un taux de déformation de 10 à 75 % et en ce qu'une seconde déformation par laminage additionnelle de l'ébauche de bande en une bande d'acier (S) se déroule dans une seconde étape de laminage immédiatement à la suite d'un éventuel réchauffage de l'ébauche de bande à la température de laminage.
  5. Procédé suivant la revendication 4, caractérisé en ce que l'ébauche de bande formée par la première déformation par laminage de la barre coulée est mise à longueur avant la seconde déformation par laminage, le cas échéant avant le réchauffage à la température de laminage, suivant des poids de bobines prédéterminés.
  6. Procédé suivant l'une ou l'autre des revendications 4 ou 5, caractérisé en ce que l'ébauche de bande mise à longueur est enroulée en une bobine dans une station d'accumulation intermédiaire (26), le cas échéant stockée et ensuite à nouveau déroulée, réchauffée à la température de laminage et envoyée à la seconde déformation par laminage.
  7. Procédé suivant l'une ou l'autre des revendications 4 ou 5, caractérisé en ce que l'ébauche de bande mise à longueur est enroulée en une bobine dans une station d'accumulation intermédiaire (26), le cas échéant stockée, réchauffée à la température de laminage, déroulée et envoyée à la seconde déformation par laminage.
  8. Procédé suivant l'une quelconque des revendications 4 à 7, caractérisé en ce que la seconde déformation par laminage est effectuée par laminage réversible.
  9. Procédé suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que la bande d'acier produite par déformation par laminage est mise à longueur après le refroidissement dans la section de refroidissement (23), suivant des poids de bobines prédéterminés.
  10. Procédé suivant l'une quelconque des revendications 1 à 9, caractérisé en ce que la vitesse de coulée est réglée à des valeurs de 3 à 12 m/min.
  11. Procédé suivant l'une quelconque des revendications 1 à 10, caractérisé en ce que l'acier en fusion pénètre dans la lingotière de coulée continue (13) sous la forme d'un jet de coulée libre (11) sous une atmosphère de gaz protecteur.
  12. Procédé suivant l'une quelconque des revendications 1 à 11, caractérisé en ce que l'atmosphère de gaz protecteur est formée d'au moins un gaz inerte ou d'un forming gaz.
  13. Procédé suivant l'une quelconque des revendications 1 à 12, caractérisé en ce que la peau de la barre qui se forme sur les parois intérieures de la lingotière de coulée continue (13) n'est soumise à aucune déformation néfaste à l'intérieur de la lingotière de coulée continue.
  14. Procédé suivant l'une quelconque des revendications 1 à 13, caractérisé en ce que l'acier en fusion traverse un bassin de coulée (4) à régulation de débit avant son introduction dans la lingotière de coulée continue (13) et en ce que l'ajustement du ménisque de coulée dans la lingotière de coulée continue (13) est effectué par une régulation de l'extraction.
  15. Procédé suivant la revendication 14, caractérisé en ce que l'acier en fusion traverse une chambre d'entrée (7) et une chambre de sortie (8) reliée à celle-ci par des canaux (9), d'un bassin de coulée (4), avant son introduction dans la lingotière de coulée continue (13), et en ce que le ménisque formé par l'acier en fusion dans les deux chambres est réglé en hauteur, dans au moins une des deux chambres, par réglage de la pression dans la chambre.
  16. Procédé suivant la revendication 15, caractérisé en ce que le niveau de l'acier en fusion dans la chambre de sortie (8) est régulé en hauteur par le débit de l'acier en fusion dans les canaux (9) et le niveau du ménisque dans la chambre d'entrée (7) est maintenu constant.
  17. Installation pour la fabrication d'une bande d'acier laminée à chaud à partir d'un acier en fusion, se composant d'une installation de coulée continue (1) et d'au moins un dispositif de laminage (21) disposé à la suite en une installation combinée, caractérisée en ce que:
    l'installation de coulée continue (1) présente une lingotière de coulée continue (13) oscillante refroidie avec une cavité ayant, transversalement à la direction d'extraction de la barre, une section transversale de forme sensiblement constante sur sa longueur et un bassin de coulée (4) est disposé au-dessus de cette lingotière de coulée continue, dont au moins un orifice de sortie (10) de l'acier en fusion est positionné au centre au-dessus du ménisque du bain, de préférence au-dessus de la section transversale d'entrée de la lingotière et une gaine protégeant de façon étanche le jet de coulée par rapport à l'atmosphère relie le bassin de coulée (4) à la lingotière de coulée continue (13),
    l'installation de coulée continue est suivie d'au moins un dispositif de laminage (21), se composant d'au moins une cage de laminoir, pour la déformation de la barre coulée (G) en une bande d'acier (S),
    ledit au moins un dispositif de laminage (21) est le cas échéant immédiatement précédé d'un étage de réchauffage (20) pour la barre coulée, et
    une section de refroidissement (23) et une installation de bobinage (24) sont disposées à la suite du dispositif de laminage (21).
  18. Installation suivant la revendication 17, caractérisée en ce que le dispositif de laminage (21) est formé d'un train finisseur à plusieurs cages (F1, F2, F3, ...).
  19. Installation suivant la revendication 17, caractérisée en ce que l'installation de coulée continue est suivie d'au moins deux dispositifs de laminage (17, 21), dans lesquels un premier dispositif de laminage (17) est constitué d'au moins une cage de laminoir pour la déformation d'une barre coulée (G) en une ébauche de bande (V) et un deuxième dispositif de laminage (21) est disposé à la suite de celui-ci pour la déformation de l'ébauche de bande (V) en une bande d'acier laminée à chaud (S), ce deuxième dispositif de laminage (21) étant immédiatement précédé par un éventuel étage de réchauffage (20) pour l'ébauche de bande.
  20. Installation suivant la revendication 19, caractérisée en ce que les cages de laminoir du premier dispositif de laminage (17) sont formées par des cages duo (18).
  21. Installation suivant la revendication 19, caractérisée en ce que les cages de laminoir du premier dispositif de laminage (17) sont formées par des cages quarto.
  22. Installation suivant l'une quelconque des revendications 19 à 21, caractérisée en ce que le premier dispositif de laminage (17) est suivi d'un dispositif de coupe (19) pour l'ébauche de bande, de préférence d'une cisaille.
  23. Installation suivant l'une quelconque des revendications 19 à 22, caractérisée en ce qu'une station d'accumulation intermédiaire (26) pour l'ébauche de bande, qui est pourvue d'une station d'enroulement et d'une station de déroulement (27, 28; 37, 38), est disposée entre le premier dispositif de laminage (17) et l'étage de réchauffage (20).
  24. Installation suivant l'une quelconque des revendications 19 à 23, caractérisée en ce que le deuxième dispositif de laminage (21) est formé d'un train finisseur à plusieurs cages (F1, F2, F3, ...) avec un dispositif de décalaminage préalable (22) du côté de l'entrée.
  25. Installation suivant l'une quelconque des revendications 19 à 23, caractérisée en ce que le deuxième dispositif de laminage (21) est formé d'une cage de laminoir réversible (30) avec chaque fois au moins un four d'enroulement (32, 33, 37, 38) disposé avant et après cette cage de laminoir réversible.
  26. Installation suivant l'une quelconque des revendications 19 à 23, caractérisée en ce que le deuxième dispositif de laminage (21) est formé d'au moins deux cages de laminoir réversibles (30, 31) opérant en tandem avec chaque fois au moins un four d'enroulement (32, 33) disposé avant et après ces cages de laminoir réversibles.
  27. Installation suivant l'une ou l'autre des revendications 25 ou 26, caractérisée en ce que des cisailles (39, 39a) sont disposées entre les cages de laminoir réversibles (30, 31) et les fours d'enroulement associés (32, 33).
  28. Installation suivant l'une ou l'autre des revendications 25 ou 26, caractérisée en ce qu'un dispositif de décalaminage (34) est disposé avant le premier dispositif de laminage (17).
  29. Installation suivant l'une ou l'autre des revendications 25 ou 26, caractérisée en ce qu'un étage de réchauffage (35) est disposé avant le premier dispositif de laminage (17).
  30. Installation suivant l'une quelconque des revendications 23 à 29, caractérisée en ce que l'étage de réchauffage (20) pour l'ébauche de bande est intégré dans la station d'accumulation intermédiaire (26).
  31. Installation suivant l'une quelconque des revendications 17 à 30, caractérisée en ce que le/les dispositif(s) de laminage (17, 21) prévu(s) pour la production d'une bande d'acier est/sont suivi(s) d'un dispositif de laminage additionnel formé d'au moins une cage finisseuse et opérant en guise de cage d'écrouissage (40).
  32. Installation suivant l'une quelconque des revendications 17 à 21 et 24, caractérisée en ce qu'une cisaille (19) est disposée après la section de refroidissement (23).
  33. Installation suivant l'une quelconque des revendications 17 à 32, caractérisée en ce que l'espace (15) destiné au passage du jet de coulée, formé par la gaine de protection (14), le bassin de coulée (4) et la lingotière de coulée continue (13), est raccordé à une conduite d'arrivée de gaz protecteur.
  34. Installation suivant l'une quelconque des revendications 17 à 33, caractérisée en ce que la cavité de la lingotière de coulée continue (13) est formée de deux faces latérales larges et de deux faces latérales étroites, en ce que la section transversale de la cavité présente une forme rectangulaire et en ce que les deux faces latérales larges sont disposées à une distance de 15 à 50 mm, de préférence de 20 à 40 mm l'une de l'autre.
  35. Installation suivant l'une quelconque des revendications 17 à 34, caractérisée en ce que la cavité de la lingotière de coulée continue (13) est formée de deux faces latérales larges et de deux faces latérales étroites, en ce que la section transversale de la cavité présente dans sa région centrale un élargissement concave, et en ce que les deux faces latérales larges sont, dans la région de la sortie de la lingotière, disposées à une distance de 15 à 50 mm, de préférence de 20 à 40 mm l'une de l'autre.
  36. Installation suivant l'une quelconque des revendications 17 à 35, caractérisée en ce que le bassin de coulée (4) comporte une chambre d'entrée étanche (7) et une chambre de sortie étanche (8), la chambre d'entrée (7) et la chambre de sortie (8) sont reliées par au moins un canal (9) disposé en dessous du ménisque de l'acier en fusion dans les deux chambres et la chambre d'entrée (7) et la chambre de sortie (8) sont équipées de dispositifs pour la régulation du ménisque de coulée dans la lingotière de coulée continue.
  37. Installation suivant la revendication 36, caractérisée en ce que la chambre d'entrée (7) et la chambre de sortie (8) sont reliées à des dispositifs de régulation de la pression.
  38. Installation suivant l'une quelconque des revendications 1 à 37, caractérisée en ce que des dispositifs de chauffage sont associés au bassin de coulée (4).
EP99927572A 1998-08-17 1999-06-21 Procede et installation de production d'une bande d'acier laminee a chaud a partir d'une masse d'acier en fusion Expired - Lifetime EP1113888B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT140198 1998-08-17
AT140198A AT409227B (de) 1998-08-17 1998-08-17 Verfahren und anlage zur herstellung von warmgewalztem stahlband aus einer stahlschmelze
PCT/AT1999/000161 WO2000010741A1 (fr) 1998-08-17 1999-06-21 Procede et installation de production d'une bande d'acier laminee a chaud a partir d'une masse d'acier en fusion

Publications (2)

Publication Number Publication Date
EP1113888A1 EP1113888A1 (fr) 2001-07-11
EP1113888B1 true EP1113888B1 (fr) 2002-08-07

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EP (1) EP1113888B1 (fr)
AT (1) AT409227B (fr)
DE (1) DE59902292D1 (fr)
WO (1) WO2000010741A1 (fr)

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CN100396391C (zh) * 2005-09-01 2008-06-25 中冶东方工程技术有限公司 薄带钢铸轧生产工艺
AT504782B1 (de) * 2005-11-09 2008-08-15 Siemens Vai Metals Tech Gmbh Verfahren zur herstellung eines warmgewalzten stahlbandes und kombinierte giess- und walzanlage zur durchführung des verfahrens
DE102006004688A1 (de) 2006-02-02 2007-08-16 Sms Demag Ag Verfahren und Giess-Walz-Anlage zum Herstellen von warmgewalztem Metall - insbesondere Stahlwerkstoff-Band mit hoher Oberflächengüte
DE102008020412A1 (de) 2007-08-24 2009-02-26 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Gießwalzen
AT508790B1 (de) 2009-09-23 2013-11-15 Siemens Vai Metals Tech Gmbh Verfahren und vorrichtung zum vergiessen von metallischer schmelze zu stranggegossenen vorprodukten in einer stranggiessmaschine
IT1404286B1 (it) * 2011-01-24 2013-11-15 Danieli Off Mecc Procedimento di laminazione per nastri e relativa linea di laminazione
IT1403833B1 (it) * 2011-02-03 2013-10-31 Danieli Off Mecc Procedimento di laminazione per nastri e relativa linea di laminazione
CN102699030B (zh) * 2012-05-30 2014-05-14 东北大学 一种薄板坯连铸连轧易酸洗热轧带钢的制备方法
CN104138899A (zh) * 2014-06-23 2014-11-12 梧州恒声电子科技有限公司 一种热轧钢板的控制工艺
JP6684968B2 (ja) 2016-11-10 2020-04-22 エス・エム・エス・グループ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング 連続鋳造圧延設備内において、金属的なストリップを製造するための方法
IT201700028732A1 (it) * 2017-03-15 2018-09-15 Danieli Off Mecc Impianto combinato di colata continua e laminazione di nastri metallici a caldo
IT201700028768A1 (it) * 2017-03-15 2018-09-15 Danieli Off Mecc Impianto combinato di colata continua e laminazione di nastri metallici a caldo
CN110340143A (zh) * 2019-07-30 2019-10-18 周志光 一种铝带浇注轧机装置
CN112743456B (zh) * 2020-11-27 2022-04-08 北京电子科技职业学院 一种带钢无酸除鳞装置

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DE4404858A1 (de) * 1994-02-16 1995-08-17 Karl Hein Verfahren und Vorrichtung zum Gießen von Blechen und Bändern
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ATA140198A (de) 2001-11-15
DE59902292D1 (de) 2002-09-12
EP1113888A1 (fr) 2001-07-11
WO2000010741A1 (fr) 2000-03-02
AT409227B (de) 2002-06-25

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