• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for operating a cast-rolled composite plant and a cast-rolling composite plant. The invention is intended to reduce the adhesion of scale to the strand (30), so that the strand (30) can either be finish rolled completely without descaling or at least the number of descaling steps or the intensity of the descaling can be reduced. This object is achieved in that the two broad sides of the strand (30) either in the continuous casting machine (1) or after leaving the continuous casting machine (1) are coated with a coating material, wherein the strand (30) in the coating a surface temperature TSurf of 1150 ° C.> Turf> 900 ° C. and the coating material hinders the diffusion of oxygen (O 2) into the strand (30) or reduces the reactivity of the hot broad sides, and wherein the coated strand (30) is uncentered into the roughing train (6) entry.
    公开号:AT520084A4
    申请号:T50843/2017
    申请日:2017-10-03
    公开日:2019-01-15
    发明作者:Bernd Linzer Dr；Thomas Pfatschbacher Dr；Winkler Roman
    申请人:Primetals Technologies Austria GmbH；
    IPC主号:
    专利说明:

    description
    Method for operating a cast-rolled composite plant and cast-rolled composite plant
    Field of engineering
    The present invention relates to the technical field of cast-rolling composite plants and the production of flat, metallic steel products on a casting roll
    Combined plant.
    Specifically, the invention relates to a method for operating a cast-rolling composite plant, wherein in one
    Continuous casting machine molten steel to an endless strand with slab cross-section, preferably thin slab cross section, is cast, the strand in a roughing mill to a pre-strip pre-rolled, the pre-strip in one
    Finishing mill is finished rolled into a finished strip, and the finished strip is discharged after cooling as a plate or reel.
    Moreover, the invention relates to a cast-rolling composite plant for carrying out the method according to the invention, comprising - a continuous casting machine for casting molten steel to an endless strand with slab cross section, preferably thin slab cross-section, - a roughing mill for Vorwalzen the strand to a pre-strip, - a finishing train for finish rolling the pre-strip into a finished strip, - a cooling section for cooling the finished strip, and - a discharge device for conveying out the cooled finished strip as a plate or reel.
    State of the art
    Cast-rolling compound plants, such as an Arvedi-ESP plant, a CSP plant or a QSP-DUE plant, have become established in the market for the production of flat steel products.
    Due to the typically relatively high surface temperatures of the cast strand when leaving the
    Continuous casting machine or by the use of a tunnel kiln after the continuous casting machine scaling the strand within a short time relatively strong. Although the use of inert furnaces from the literature is known, their high
    Operating costs currently not yet economical. By the
    Descaling of the scaled surfaces is also the
    Temperature of the strand or Vorstreifens set strongly down, whereby an energy-intensive heating of the
    Vorstrreifens before the finish rolling is necessary. As a result, the energy efficiency of the cast-rolling composite system drops and the operating costs increase.
    From EP 916 414 the application of a so-called
    Reactant on a pre-strip in a cast rolling mill
    Composite system known. As examples of the reactant, metal powder, carbon but also metal oxides are mentioned.
    From the publication M. Sartor et al. "Reduce material loss due to scales during reheating with coatings", Stahl und Eisen, 136, No. 2, 2016 shows the use of an inorganic compound
    Silicon base known as a coating material. By the
    Coating should reduce the scale-related loss of material.
    Summary of the invention
    The invention is based on the object, not the
    To prevent formation of scale, but to reduce the adhesion of the scale to the strand or the thin slab, so that the scale either finished without descaling or at least the number of descaling and / or the
    Intensity of descaling can be reduced.
    In particular, the use of energy in the operation of
    Descaling devices over the prior art can be significantly reduced, without this having a negative effect on the quality of the finish strip.
    This object is solved by the subject matter of claim 1. Advantageous embodiments are the subject of the dependent claims.
    Specifically, the solution is carried out by a generic
    Method, wherein the two broad sides of the strand or the slab either already in the continuous casting or after leaving the continuous casting machine with a
    Coating material to be coated. However, the coating takes place before any possible
    Intermediate heating of the strand or the slab and before one
    Rough rolling. The strand or the slab points at the
    Coating a surface temperature TSurf of 1150 ° C> TSurf> 900 ° C on. The applied coating material obstructs the diffusion of oxygen O 2 into the strand or reduces the reactivity of the hot broadsides. Subsequently, the coated strand or the slab enters the roughing train without being descaled. Thus, the invention is suitable both for continuous cast-rolled
    Compound systems as well as for the batch or semi-endless
    Operation suitable.
    By impregnating the hot broad sides of the strand in the continuous casting or preferably after leaving the continuous casting machine with a coating material is an intimate connection between the strand and the
    Coating material achieved. By the coating material, e.g. a powdery borate, the diffusion of oxygen into the strand is hindered or reduced the reactivity of hot broadsides. By the direct
    Rough rolling of the coated strand in the roughing mill, i. without being descaled beforehand, the energy efficiency of the cast-rolling process is significantly increased.
    The coating material may be either in solid form, e.g. as a powder, in liquid form, or as an emulsion, e.g. as a powder dissolved in a carrier (e.g., water).
    In particular, the coating material can be sprayed onto the broad sides together with a liquid or gaseous carrier, in particular water or air, or the coating material can be rolled or brushed.
    A particularly low adhesion of the scale is achieved if the coating material is a borate, in particular a salt of boric acid, more preferably a sodium salt of boric acid, most preferably borax with or without
    Water of crystallization, such as Anhydrous borax (Na2B4O7), Borax pentahydrate (Na2B4O7 · 5Η2Ο) or Borax decahydrate (Na2B4O7 ^ 10H2O), or the coating material includes at least one of these compounds.
    To homogenize the temperature profile in the strand or to compensate for a drop in temperature, it is advantageous if the coated strand is heated in a tunnel furnace before entering the roughing train, whereby the temperature of the strand or the slab either homogenized over the thickness and / or a Temperature drop is compensated. Of the
    Tunnel kiln may, for example, also be operated with an oxidizing or reducing atmosphere.
    Especially with thin finished strip thicknesses, it is advantageous if the strand, the pre-strip and the finished strip, the continuous casting machine, the roughing mill and the
    Finishing mill passes through uncut.
    To the rolling in of the scale in the forward or
    Prefabricated rolling mill, it is expedient if the scale has a high ductility. This is achieved if, for example, the scale consists of the phase fractions 4-6% FeO, 30-40% Fe3O4 and 55-65% Fe2O3.
    Depending on the steel quality or surface requirements, it may be appropriate to the broad sides of the pre-rolled
    Vorstreifens before, preferably immediately before, to desalt the entry into the finishing train.
    In most cases, however, it will be sufficient for the pre-strip to enter the finishing train without being descaled and for the finished strip to be pickled after leaving the cast-rolled composite plant.
    The object of the invention is also achieved by a cast-rolling composite system according to claim 15, wherein in the strand guide of the continuous casting machine or after the
    Continuous casting machine and in front of the Vorwalzstraße one
    Coating machine for coating the two broad sides of the strand is arranged with a coating material, and that the coated strand enters the pre-rolling without descaling.
    Preferably, the coating machine has a mixer for intimately mixing the solid or liquid coating material with a liquid or gaseous
    Carrier, wherein the coating material by
    Spray nozzles is sprayed onto the broad sides of the strand.
    Alternatively, the coating machine may comprise a roller for rolling the coating material or brushes for brushing the coating material onto the broad sides of the strand.
    In order to protect people from contact with the coating material, it is advantageous if the coating is carried out under a negative pressure, wherein the not adhering to the broad sides of the coating material is sucked through a suction device.
    As already stated above, it may be expedient if a tunnel oven is arranged in the transport direction after the coating machine and before the roughing train.
    Brief description of the drawings
    Further advantages and features of the present invention will become apparent from the description of non-limiting
    Embodiments. The following schematically illustrated figures show:
    1 shows a cast-rolling composite plant according to the prior art
    2 shows a cast-rolled composite plant according to the invention
    3 shows a first variant with a casting according to the invention
    Roll composite system to Fig 2
    4 is an illustration of a water cycle for a
    coater
    5 shows an illustration of a coating device with
    suction
    6 shows a second variant with a cast-rolling composite system according to the invention to FIG
    Description of the embodiments
    FIG. 1 shows a cast-rolled composite plant with a casting-rolling system
    Continuous casting machine 1, a tunnel kiln 4, a roughing mill 6, a finishing train 8, a cooling section 9 and at least one coiler unit 10 according to the prior art.
    In the mold 2 of the continuous casting machine 1, a teilerstarrter strand 30 forms with the cross section of a thin slab 16. Optionally, the endless strand 30 can be cut by scissors 3 into slabs. The strand 30 or the thin slab 16 is then heated in the tunnel kiln 4, whereby the temperature profile is equalized or
    Temperature losses are compensated. Before the rough rolling in the roughing mill 6 of the strand 30 and the thin slab 16 is descaled by a descaling 5, whereby the upper surface temperature drops by about 50 to 100 ° C. After this
    Vorwalzen is the so-called. Vorband heated by an induction furnace 7 to rolling temperature. In order to prevent the rolling of scale in the finishing train 8, the pre-strip is descaled by a further descaler 5, whereby the surface temperature in turn drops by about 50 to 100 ° C. After finish rolling, the finished strip in the cooling section 9 is cooled to reel temperature and wound up by a coiler 10. Optionally, the finished strip is cut by a pair of scissors 3 on bundle length.
    The dual descaling process reduces the energy efficiency of the cast-rolled composite plant. Since the finish rolling must typically take place at a predetermined temperature or austenitic grades in the so-called austenitic temperature range, temperature drops through the induction furnace 7 must be compensated.
    2 shows a first cast rolling mill according to the invention.
    Combined plant. In contrast to FIG. 1, the broad sides of the strand 30 are either already coated in the continuous casting machine 1 or after the continuous casting machine 1 by a coating machine 11 with a coating material. In this case, the strand 30 with thin slab cross section or the thin slab 16 has a surface temperature between 900 and 1150 ° C. As the coating material, e.g. Borax with or without water of crystallization, such as Anhydrous borax (Na2B4O7), Borax pentahydrate (Na2B4O7 · 5Η2Ο) or Borax decahydrate (Na2B4O7 ^ 10H2O) can be used. The powdery
    Coating material is used in the coating machine 11 either together with a carrier, e.g. Water or air sprayed or brushed on the broadsides.
    Due to the high surface temperature that sticks
    Coating material on the broad sides and ensures that the diffusion of oxygen into the strand or the thin slab hindered or the reactivity of hot broadsides is reduced. After coating, the undentescended strand 30 is pre-rolled in the roughing train 6. Subsequently, the pre-strip is heated by the induction furnace 7 to rolling temperature. Depending on the quality requirements of the finished strip, the heated pre-strip is descaled by the descaling 5 or not. Since the Entzunderer 5 is optional, it was shown by dashed lines. After finish rolling in the finishing train 8, the finished strip is cooled and rewound as in the prior art.
    For medium demands on the surface quality of the finished strip has been found that the descaling before finish rolling can often be dispensed with, especially if the finished strip is pickled after being coiled. Especially in this case, but also in the case of one-time descaling before finish rolling is the
    Energy efficiency of the casting-rolling process significantly increased.
    FIG. 3 shows a second cast rolling mill according to the invention.
    Composite system shown. In contrast to FIG. 2, the strand 30 or the thin slab 16 is heated after being coated in a tunnel kiln 4. By heating, the temperature of the strand 30 or the thin slab 16 is increased, the temperature profile is uniformed and a temperature drop compensated. Despite the coating, a scale layer is formed, in particular in the tunnel kiln 4. On the coated strand or the coated thin slab, an extremely ductile primary scale with the phase proportions 4-6% FeO, 30-40% Fe3O4 and 55-65% Fe2O3 forms, whereby the rolling of the primary scale in the pre-6 and
    Prefabricated rolling line 8 is prevented. The intermediate heating, cooling and coiling takes place analogously to FIG. 2.
    Finally, FIG. 6 shows a very advantageous
    Embodiment of the casting rolling mill according to the invention
    Composite plant, the rolling not only completely without
    Descaling takes place but can be dispensed with the division of the rolling stands between roughing and finish rolling. In contrast to FIG. 3, the coated, preferably endless, strand 30, after being preheated in the tunnel kiln 4, descents into the seven-stand rolling mill 8a and is finish-rolled there to form a finished strip. Cooling and coiling takes place analogously to FIG. 2. This mode of operation is very advantageous in continuous operation if the continuous casting machine 1 is operated at high casting speeds vC, e.g. vc> 6 m / min, can be operated. In batch or semiendless operation, the strand 30 is cut by the scissors 3 in thin slabs 16 and then without
    Intermediate heating or descaling finish rolled. Preferably, the thin slabs 16 are accelerated on the roller table between the shears 3 and the rolling train 8a, so that the time that the thin slab is exposed to the oxygen in the air, is reduced. By coating the strand with a coating material, the diffusion of oxygen into the strand or the thin slab is hindered or the reactivity of the hot broadsides is reduced. The described measures not only improve the energy efficiency of the casting-rolling process but also drastically reduce the complexity of the cast-rolling composite plant. Both measures allow a cost-effective production of high quality finished strip.
    4 shows a cross section through a coating machine 11 for spraying a coating material with a liquid carrier. For this purpose, a pump 14 sucks a carrier material from a tank 19, in this case water. To prevent damage to the pump 14, the water is filtered before pumping. The coating material 12, here powdered borax (would also be possible an emulsion of water and borax) is sucked by a Venturi mixer 13 from the container 12 and mixed with the pressurized water and then by spray nozzles 17 on the broad sides of the thin slab strand 30 and Thin slab 16 sprayed on.
    The superfluous emulsion of water and borax is fed back to the tank 19 at the lowest point of the coating machine 11 via a return line 18.
    In contrast to Figure 4, Figure 5 shows a cross section through a coating machine 11 for spraying a
    Coating material with a gaseous carrier. For this purpose, a compressor sucks 20 air. The
    Coating material 12, here again powdered borax, is sucked out of the container 12 by a Venturi mixer 13, mixed with the compressed air and then sprayed by spray nozzles 17 onto the broad sides of the thin slab strand or the thin slab 16. In order to prevent borax vapors, the interior of the coating machine 11 is held by the fan 21 under a negative pressure, so that there can be no contact between the operator on the cast-rolling composite plant and the borax.
    Although the invention in detail by the preferred
    While embodiments have been further illustrated and described, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.
    LIST OF REFERENCES 1 continuous casting machine 2 mold 3 scissors 4 tunnel kiln 5 descaler 6 roughing line 7 induction furnace 8 finish rolling line 8a rolling line 9 cooling section 10 coiler 11 coating machine 12 tank for coating material 13 venturi mixer 14 pump 15 filter 16 slab or thin slab 17 spray nozzles 18 return line 19 tank 20 compressor 21 Fan 30 strand
    权利要求:
    Claims (18)
    [1]
    claims
    1. A method for operating a cast-rolled composite plant, wherein in a continuous casting machine (1) molten steel to an endless strand (30) with slab cross section, preferably thin slab cross section, the strand (30) in a roughing mill (6) pre-rolled to a pre-strip, the pre-strip finish-rolled in a finishing train (8) to a finished strip, and the finished strip is discharged after cooling as a plate or reel, characterized in that the two broad sides of the strand (30) either in the continuous casting or after Leaving the continuous casting machine (1) are coated with a coating material, wherein the strand in the coating has a surface temperature TSurf of 1150 ° C> Turf> 900 ° C and the coating material obstructs the diffusion of oxygen (O2) in the strand or the reactivity of the reduced hot broadsides, and wherein the coated strand (30) uncentered in the Vorwalzstra ße (6) enters.
    [2]
    2. The method according to claim 1, characterized in that the coating material is solid or liquid.
    [3]
    3. The method according to claim 2, characterized in that the coating material and by a liquid or gaseous carrier, in particular water or air, is sprayed onto the broadsides, or the coating material is rolled or brushed.
    [4]
    4. The method according to claim 3, characterized in that the coating material is a borate, in particular a salt of boric acid, more preferably a sodium salt of boric acid, most preferably borax with or without water of crystallization, such as anhydrous borax (Na2B4O7), borax pentahydrate (Na2B4O7 · 5Η2Ο) or borax decahydrate (Na2B4O7 ^ 10H2O), or the coating material contains at least one of these compounds.
    [5]
    5. The method according to any one of the preceding claims, characterized in that the coated strand (30) before entering the Vorwalzstraße (6) is heated in a tunnel furnace (4), whereby the temperature of the strand (30) is homogenized either over the thickness and / or a temperature drop is compensated.
    [6]
    6. The method according to claim 5, characterized in that the tunnel furnace (4) has an oxidizing atmosphere.
    [7]
    7. The method according to claim 5, characterized in that the tunnel furnace (4) has a reducing atmosphere.
    [8]
    8. The method according to any one of the preceding claims, characterized in that the strand (30), the pre-strip and the finished strip uncut the continuous casting machine (1), the roughing train (6) and the finishing train (8) passes through.
    [9]
    9. The method according to any one of the preceding claims, characterized in that the scale when entering the strand (30) in the roughing train (6) has a high ductility, so that the scale in the roughing train (6) is not rolled.
    [10]
    10. The method according to claim 9, characterized in that the scale of the phase portions 4 - 6% FeO, 30 - 40% Fe3O4 and 55 - makes up 65% Fe2O3.
    [11]
    11. The method according to any one of the preceding claims, characterized in that the broad sides of the pre-strip are descaled before, preferably immediately before, the entry into the finishing train.
    [12]
    12. The method according to any one of claims 1 to 10, characterized in that the scale when entering the Vorstreifens in the finishing train (8) has a high ductility, so that the scale in the finishing train (8) is not rolled.
    [13]
    13. The method according to claim 12, characterized in that the scale of the phase portions 4 - 6% FeO, 30 - 40% Fe3O4 and 55 - makes up 65% Fe2O3.
    [14]
    14. The method according to claim 12 or 13, characterized in that the pre-strip enters the finishing train (8) without descaling and the finished strip is pickled after leaving the casting-rolling compound.
    [15]
    15. Cast-rolling composite plant for carrying out the method according to one of the preceding claims, comprising - a continuous casting machine (1) for casting molten steel to an endless strand (30) with slab cross section, preferably thin slab cross section; - A pre-rolling line (6) for pre-rolling of the strand (30) to a pre-strip; - A finishing train (8) for finish rolling the Vorstreifens to a finished strip; - A cooling line (9) for cooling the finished strip; and - a discharge device (10) for discharging the cooled finished strip as a plate or reel; characterized in that in the strand guide of the continuous casting machine (1) or after the continuous casting machine (1) and before the rough rolling mill (6) a coating machine (11) for coating the two broad sides of the strand (30) is arranged with a coating material, and that coated strand (30) enters the pre-rolling line (6) without descaling.
    [16]
    16. Cast-rolling composite plant according to claim 15, characterized in that the coating machine (11) comprises a mixer (13) for intimately mixing the solid or liquid coating material with a liquid or gaseous carrier, and the coating material by spray nozzles (17) the broad sides of the strand (30) is sprayed.
    [17]
    17. Cast-rolling composite plant according to claim 15, characterized in that the coating machine has a roller for rolling the coating material or brushes for brushing the coating material on the broad sides of the strand.
    [18]
    18 cast rolling compound system according to claim 16 or 17, characterized in that the coating is carried out under a negative pressure, wherein the non-adhering to the broad sides of the coating material is sucked through a suction device (21).
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    同族专利:
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50843/2017A|AT520084B1|2017-10-03|2017-10-03|Method for operating a cast-rolled composite plant and cast-rolled composite plant|ATA50843/2017A| AT520084B1|2017-10-03|2017-10-03|Method for operating a cast-rolled composite plant and cast-rolled composite plant|
    EP18788997.7A| EP3691804A1|2017-10-03|2018-09-13|Method for operating an integrated casting roll facility, and integrated casting roll facility|
    PCT/EP2018/074781| WO2019068444A1|2017-10-03|2018-09-13|Method for operating an integrated casting roll facility, and integrated casting roll facility|
    CN201880065012.9A| CN111148581A|2017-10-03|2018-09-13|Method for operating a combined casting and rolling installation and combined casting and rolling installation|
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