EP2566989B1 - Procédé de laminage à chaud de bandes d'acier et train de laminage à chaud - Google Patents

Procédé de laminage à chaud de bandes d'acier et train de laminage à chaud Download PDF

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Publication number
EP2566989B1
EP2566989B1 EP11715225.6A EP11715225A EP2566989B1 EP 2566989 B1 EP2566989 B1 EP 2566989B1 EP 11715225 A EP11715225 A EP 11715225A EP 2566989 B1 EP2566989 B1 EP 2566989B1
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EP
European Patent Office
Prior art keywords
cooling
steel strip
hot rolling
cooling section
strip
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EP11715225.6A
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German (de)
English (en)
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EP2566989A1 (fr
Inventor
Gerald Hohenbichler
Gerald Eckerstorfer
Bernd Linzer
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Primetals Technologies Austria GmbH
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SIEMENS VAI METALS TECHNOLOGIES GmbH
Siemens VAI Metals Technologies GmbH Austria
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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
    • B21B1/22—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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets

Definitions

  • the invention relates to a method for hot rolling of steel strips in a plurality of successive rolling stands, wherein the steel strips are rolled finished austenitic first and then, after an intensive interstand liquid cooling, in the ferritic state in one or more rolling stands to the final thickness, and a corresponding hot rolling mill.
  • Hot rolling is used when the rolling stock has a temperature above its recrystallization temperature during rolling. For steel, this is the range above about 780 ° 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.
  • degrees of deformation ie the ratio of initial thickness to input thickness, of up to 1: 200 are possible: for example, in a hot strip mill starting from a slab thickness of typically 240 mm, final thicknesses of 1.2 to 15 mm can be achieved.
  • rolling in the austenitic state when both the initial rolling and the final rolling temperature are in the austenitic region of the respective steel.
  • the austenite area of a steel depends on the steel composition, but is usually above 800 ° C.
  • the final thickness can not be chosen arbitrarily small because the rolling stock cools during each rolling process and finally falls out of the austenite region.
  • This can only be countered by the fact that the rolling stock already reaches the hot rolling stands with reduced thickness, ie was either reduced accordingly in a roughing mill or in a - decoupled - Dünnbandg discernstrom is produced because the capacity of a Thin strip casting plant usually is not sufficient for a coupled operation.
  • the reduction in the thickness of the rolling stock before hot rolling thus leads to significant capacity losses, the direct coupling of the hot rolling stands to a continuous casting or strip casting plant with high capacity for carrying out the so-called direct coupled or endless operation is usually not possible.
  • steel can also be hot rolled in the ferritic state.
  • the iron atoms are cubic body centered, the steel is softer than in the austenitic state and can be easily deformed.
  • the temperature of the steel in the ferritic state (ferrite region) is lower than in the austenite region, less rolling force is needed to reshape the steel. This is exploited to achieve even lower thicknesses and / or even greater widths in the finished steel strip.
  • the low reshaping resistance of the ferrite is preferably limited to a relatively narrow temperature range of 100-150 ° C below the temperature where the complete equilibrium phase transition from austenite to ferrite occurs.
  • the carbon content is plotted on the x-axis and the temperature on the y-axis, it can be seen as a line between the points G and P.
  • G-P line both austenite (so-called gamma mixed crystals) and ferrite (so-called alpha mixed crystals) are present, below the line G-P, ie below the equilibrium austenite boundary temperature, only more ferrite (alpha mixed crystals) is present.
  • the DE 196 00 990 A1 proposes for this purpose, the steel strip after the austenitic rolls to an intermediate thickness of 2-12 mm in one cool single cooling step and then in one or more steps, so in one or more rolling stands, to finish ferritically finished.
  • the inventive method is only well applicable if the final thickness is less than 3 mm, because only then in the cooling section sufficient cooling (the entire band cross-section) can take place.
  • a bandwidth of the steel strip of 1 m and a length Lc of the cooling section of 1 m are on the cooling section on each side of the tape at least 284 liters per minute of liquid, usually water, apply, preferably 568 l / min and side of the band. If the steel strip is only 0.5 m wide and the length of the cooling section remains the same, apply at least 142 l / min to the upper and lower sides of the steel strip on the cooling line, preferably 284 l / min. If, at steel strip width 1 m, the cooling section is only 0.5 m long, significantly higher amounts of water are to be applied to the shorter cooling section, namely both the top and on the bottom 760 l / min, preferably even 1520 l / min.
  • the inventive method can be used both in regulation and in the precontrol of the outlet temperature of the steel strip from the last frame before the liquid cooling. Controlling the temperature requires that an actual value be measured, which is often not the case because the temperature is calculated using models. For pre-control, the outlet temperature is determined using other known data, such as process models.
  • the feedforward control or regulation of the outlet temperature of the steel strip from the last stand before the liquid cooling on quality and / or reduction-dependent tables or on simple grading and / or reduction-dependent mathematical relationships between width-specific mass flow rate (or the belt speed and the strip thickness) and inlet temperature in the first roll stand based.
  • the amount of water according to the invention can be with appropriate control of the outlet temperature from the last stand before cooling, which is usually carried out by the so-called level 2 control of the hot rolling mill, achieve an intermediate cooling of the steel strip of more than 30 K to more than 100 K, so that full-ferrite structure of the steel strip is ensured before it enters the next mill, where then ferritic is rolled.
  • the process according to the invention can be used particularly well if the width-specific throughput through the rolling stands is less than 12 mm m / s, preferably less than 9.5 mm m / s.
  • the throughput or volume flow is often specified in the rolling technique as a volume-specific volume flow, ie as a volume flow per unit width (1 m), and can be represented as the product of thickness of a band (usually in mm) and belt speed (usually in m / s).
  • this (broad specific) throughput should not be too high, that is to say be less than 15 mm / s, more preferably less than 12 mm / s, e.g. smaller 9.5 mm m / s.
  • the rolling stock ie the steel strip
  • the cooling must therefore ensure that in the steel strip after cooling and before entering the following rolling stands for ferritic rolling almost exclusively ferritic microstructure, ie at least 90% ferritic microstructure, preferably at least 95% ferritic microstructure, is present.
  • the volume specific volume flow and the inlet temperature of the steel in the hot rolling line, which form the rolling stands for hot rolling intensive cooling between at least two rolling stands is necessary to ensure the transformation into almost exclusively ferritic microstructure in which the average cooling rate T 'of the steel strip is to be at least 40 K / s, better still more than 60 K / s, preferably 90 K / s, within the rolling stand spacing (between the last rolling stand before and the first rolling stand after cooling).
  • the required cooling rate T '[K / s] is also dependent on the outlet temperature of the steel strip after the mill before cooling, on the exit speed from this mill and on the distance between the last mill before cooling and the first mill after cooling.
  • the composition of the steel also plays a role.
  • Lc stands for the length of the cooling section within which the cooling rate T '[K / s] can be achieved.
  • the stand spacing between the last roll stand before and the first roll stand after cooling can also be used, then T 'becomes the average cooling rate between the two roll stands.
  • v m denotes the mean discharge speed from the last roll stand before cooling.
  • the temperature difference Tm-Ta (in the factor A) should not be greater than 70 K, more preferably less than 50 K, preferably less than 25 K. This can be ensured, for example, by the so-called Level 2 Automation, which controls the hot rolling mill.
  • the multiplication factor [0.5 ... 2.0] occurring at A is due to the significant scattering found in conversion and cooling tests at different cooling exposures to achieve 90 and 95% ferritization, respectively.
  • the known steel properties of the steel strips, which are rolled in the hot rolling mill, for a given length Lc of the cooling section results in an at least required cooling rate T ', from which the minimum required heat transfer coefficient can be determined and from which, in turn, the required amount of cooling liquid (cooling water) can be determined from mostly empirical or experimentally found relationships.
  • cooling only takes place between the penultimate and last roll stand of a hot rolling mill, that is, the steel strip is rolled in the austenitic state on the penultimate roll stand, then ferritization takes place by the cooling and in the last rolling stand the steel strip is rolled in the ferritic state ,
  • cooling takes place only between the third last and penultimate roll stand, so that the steel strip is rolled in the austenitic state on the third to last rolling stand, then takes place by the cooling ferritization and in the penultimate and last rolling mill, the steel strip is rolled in the ferritic state ,
  • the length Lc of the cooling section is between 5 and 30% of the distance between the preceding and the following Roll stand amounts.
  • the cooling section consists of at least two rows of spray nozzles per band side, wherein a row of nozzles results in a minimum length of the cooling section - in the sense of the present invention - of 350 mm.
  • the austenite ferrite conversion possible useful when the cooling section is located closer to the previous than the following rolling stand, in particular in connection with a relatively short cooling distance of 5 and 30% of the distance between the preceding and following mill stand.
  • the cooling section should preferably be arranged at least 20% closer to the preceding than to the following rolling stand.
  • the method according to the invention is best used in installations where the distance between successive rolling stands between which the cooling takes place is between 3.5 and 7 m. At these intervals, it is certainly possible that after cooling of the steel strip still enough time for the most complete transformation of the structure into ferrite takes place.
  • the invention is also advantageous for steel strips with a width between 800 and 2200 mm applicable.
  • the strip thickness of the steel strip before cooling is generally 1.2 to 5 mm, in particular 1.5 to 3.5 mm, preferably 1.8 to 3.5 mm.
  • the steel strip can be finish rolled from continuously cast semi-finished products in directly successive work steps.
  • a direct coupling of the hot rolling mill can be made to a continuous casting plant, so that steel strips with a strip thickness of less than 3 mm can be produced in a continuous process.
  • the steel strip could first be rough rolled in one to four steps, then heated again to at least 1100 ° C and then finish rolled in three to five steps.
  • other devices such as shears, ovens, cooling systems, Vorwalzanlagen, storage facilities, systems for descaling, etc. may be present.
  • the hot rolling mill can also consist of more than five rolling stands, so that the steel strip can be finish rolled in more than five steps.
  • the invention can also be applied to a hot rolling plant arranged downstream of a strip casting plant.
  • a use according to the invention of a multi-stand hot rolling mill has between two successive rolling stands a cooling section for pressurizing the steel strip with liquid on both sides and an associated pilot control or regulating device, which is set so that at least in the cooling section on both sides of the steel strip as a function of the length Lc of the cooling section depending on a liquid quantity Qu> 284 / (Lc 1.42 ) liters per minute and per meter of bandwidth, in particular Qu> 2 * 284 / (Lc 1.42 ) liters per minute and per meter of bandwidth applied, and provides a pilot control or Regulation before, which sets the difference between the outlet temperature of the steel strip from the last stand before the cooling section and the equilibrium Austenitgrenztemperatur by controlling the outlet temperature to not greater than 70 K, preferably not greater than 50 K, preferably less than 20 K.
  • the cooling section is the route on which leaking liquid impinges on the steel strip.
  • the cooling section can be arranged between penultimate and last rolling stand and / or third last and second last rolling stand.
  • the length Lc of the cooling section may be between 5 and 30% of the distance between the preceding and following stand, in particular they consist of only one each over the width of arranged nozzle row per strip surface (ie one row of nozzles above as well as below).
  • the cooling section can be arranged closer to the preceding than to the following rolling stand, in particular by at least 20% closer to the preceding than to the following rolling stand.
  • the distance between successive rolling stands, between which a cooling section is arranged, should be best between 3.5 and 7 m.
  • the width of the hot rolling line and the cooling section will usually be designed for a bandwidth of the steel strip between 800 and 2200 mm.
  • the hot rolling mill may be connected to a continuous casting plant in such a way that the steel strip of continuously cast semi-finished products can be finish rolled in directly successive work steps.
  • this can result in a composite rolling mill with a hot rolling mill according to the invention, wherein the composite rolling mill has a roughing mill with one to four rolling stands, a heater for heating the steel strip from the roughing mill to about 1100 ° C and a hot rolling mill with three to five rolling stands for finish rolling.
  • the hot rolling mill may include more than five scaffolding.
  • a final thickness of less than 1 mm can be achieved in one (or two) further rolling stand (s) by ferritic rolling, with the additional advantage that the last (or last two) rolling stand (s) require significantly lower rolling forces, resulting in energy savings for the hot rolling mill.
  • the entire hot rolling process is more stable than conventional methods because an undetermined partial ferritic rolling is excluded at the last or penultimate pass.
  • the invention will be explained by way of example with reference to a schematic figure.
  • the figure shows the side view of a hot rolling mill with cooling section.
  • the steel strip 3 enters at the left edge of the figure in the hot rolling mill, consisting of the rolling stands F1 to F5, with an inlet temperature of less than 1050 ° C, preferably less than 1020 ° C, such as a roughing, which is connected to a continuous casting.
  • the temperature of the steel strip 3 refers to the average value of the temperature averaged over the strip cross section.
  • the steel strip 5 is rolled in the austenitic state, it leaves the rolling stand F3 with a typical strip thickness of less than 3 mm.
  • the cooling section 1 has here on both sides of the band to a plurality of spray nozzles 2, which are arranged in at least one row of nozzles per band side, and has a length Lc of at least 350 mm.
  • the distance LF3 between the third roll stand F3 and the beginning of the cooling section 1 is here only a fraction of the distance LF4 between the fourth rolling stand F4 and the end of the cooling section 1.
  • the cooling section leads the steel strip 3 according to the invention both on the top and on the bottom of an inventive amount of water per minute and bandwidth in meters, whereby the steel strip 3 cools.
  • the steel strip 3 Until the steel strip 3 enters the fourth rolling mill F4, an almost complete transformation of the microstructure into ferrite has taken place, so that the steel strip 3 is in the ferritic state is reduced in the fourth rolling mill.
  • the steel strip 3 In the fifth rolling stand F5, the steel strip 3 is rolled in the ferritic state to its final thickness of less than 1.5 mm.
  • the amount of water applied on both sides will be between two and four times the value of 284 / (Lc 1.42 ) if the difference between the outlet temperature from the rolling stand F3 and the austenite boundary temperature is less than 50 K and the width-specific throughput is not too high is high, that is, for example, in the range of 5 to 12 mm m / s.
  • spray nozzles are used for applying the cooling water, which are arranged in rows in the width direction of the steel strip. If only one row of nozzles is used, this corresponds to a model cooling section 1 with a length of about 350 mm. This results e.g. with an oblique rotation / arrangement of the nozzles from the distance between the first and last point of impact of the water jet on the steel strip 3. From two rows of nozzles, so from a number of n nozzle rows, the length Lc of the cooling section is calculated from the distance between the first and last point of impact Water jet of a row of nozzles plus the (n-1) -fold mean distance between two rows of nozzles with each other.
  • the distance between third F3 and fourth rolling stand F4 could be smaller and the distance between fourth F4 and fifth rolling stand F5 greater.
  • austenitic rolling would take place in the first four rolling stands F1 to F4, while ferritic rolling would only take place in the fifth rolling stand F5 after the most complete conversion of the structure of the steel strip 3 into ferrite.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)

Claims (24)

  1. Procédé de laminage à chaud de bandes d'acier (3) dans plusieurs cages de laminoir successives (F1-F5), les bandes d'acier étant d'abord laminées à l'état austénitique puis, après un refroidissement intense par liquide entre deux cages, soumises à l'état ferritique à un laminage de finition jusqu'à l'épaisseur finale dans une ou plusieurs cages de laminoir, caractérisé en ce que l'épaisseur finale de la bande d'acier (3) est inférieure à 3 mm, en particulier inférieure à 2,5 mm, de préférence inférieure à 1,49 mm, en ce que la différence entre la température de la bande d'acier en sortie de la dernière cage de laminoir (F3) avant le refroidissement par liquide et la température limite austénitique d'équilibre est ajustée par une commande pilote ou une régulation de cette température de sortie pour qu'elle soit inférieure ou égale à 70 K, de préférence inférieure ou égale à 50 K, mieux encore inférieure à 25 K, et en ce que le refroidissement par liquide entre deux cages de laminoir est effectué en fonction de la longueur Lc d'une section de refroidissement (1) en appliquant dans ladite section de refroidissement, de part et d'autre de la bande d'acier (3), respectivement au moins une quantité de liquide Qu > 284/(Lc1,42) litres par minute et par mètre de largeur de bande, en particulier Qu > 2*284/(Lc1,42) litres par minute et par mètre de largeur de bande, sans toutefois dépasser Qu = 7*284/(Lc1,42) litres par minute et par mètre de largeur de bande, de préférence Qu < 4*284/(Lc1,42) litres par minute et par mètre de largeur de bande.
  2. Procédé selon la revendication 1, caractérisé en ce que le débit en largeur à travers les cages de laminoir est inférieur à 12 mm m/s, de préférence inférieur à 9,5 mm m/s.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la commande pilote ou la régulation de la température de la bande d'acier en sortie de la dernière cage de laminoir (F3) avant le refroidissement par liquide est basée sur des tableaux dépendant de la qualité et/ou du taux de réduction ou sur de simples relations mathématiques dépendant de la qualité et/ou du taux de réduction entre le débit massique en largeur et la température d'entrée dans la première cage de laminoir(F1).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'il est établi un taux de refroidissement moyen T'=A*B*vm/Lc entre la dernière cage de laminoir (F3) avant le refroidissement par liquide avec une section de refroidissement (1) de longueur Lc et la première cage de laminoir (F4) après le refroidissement par liquide,
    où A=[0,5...2]*40+(Tm-Ta), avec la température moyenne Tm de la bande d'acier (3) en sortie de la dernière cage de laminoir (F3) avant le refroidissement par liquide et la température limite austénitique d'équilibre Ta,
    où B=0,95+0,5*(100-Fe), avec la teneur en fer Fe de l'acier en % en masse,
    et où vm désigne la vitesse de bande entre lesdites deux cages de laminoir (F3, F4).
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le liquide de refroidissement est de l'eau avec une température d'application comprise entre 15°C et 60°C, de préférence entre 25°C et 40°C.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le refroidissement est effectué entre les avant-dernière (F4) et dernière (F5) cages de laminoir et/ou les troisième dernière (F3) et avant-dernière (F4) cages de laminoir.
  7. Procédé selon la revendication 6, caractérisé en ce qu'un refroidissement est effectué entre les troisième dernière (F3) et avant-dernière (F4) cages de laminoir, et on ouvre l'avant-dernière cage de laminoir (F4) en cas de refroidissement insuffisant.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la longueur Lc de la section de refroidissement (1) représente entre 5 et 30% de la distance entre la cage de laminoir précédente (F3) et la cage de laminoir suivante (F4).
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la section de refroidissement (1) est agencée plus proche de la cage de laminoir précédente (F3) que de la cage de laminoir suivante (4), en particulier au moins de 20% plus proche de la cage de laminoir précédente que de la cage de laminoir suivante.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que la distance (Lg) entre cages de laminoir successives (F3, F4) entre lesquelles le refroidissement a lieu est comprise entre 3,5 et 7 m.
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que la largeur de bande de la bande d'acier (3) est comprise entre 800 et 2200 mm.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que l'épaisseur de bande de la bande d'acier (3) avant la section de refroidissement (1) est de 1,2 à 5mm, en particulier de 1,5 à 3,5 mm, de préférence de 1,8 à 3,5 mm.
  13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que la bande d'acier (3) constituée d'un demi-produit coulé en continu est soumise à un laminage de finition au cours d'étapes se succédant directement.
  14. Procédé selon la revendication 13, caractérisé en ce que la bande d'acier (3) est d'abord dégrossie en une à quatre étapes, puis de nouveau portée à une température d'au moins 1100°C et ensuite soumise à un laminage de finition en trois à cinq étapes.
  15. Utilisation d'un train de laminage à chaud à plusieurs cages de laminoir pour la mise en oeuvre du procédé selon l'une des revendications 1 à 12, caractérisée en ce qu'il est prévu, entre deux cages de laminoir successives (F3, F4), une section de refroidissement (1) pour appliquer de liquide de part et d'autre de la bande d'acier (3), et un dispositif associé de commande pilote ou de régulation, ajusté pour appliquer dans ladite section de refroidissement (1) de part et d'autre de la bande d'acier en fonction de la longueur Lc de la section de refroidissement, respectivement au moins une quantité de liquide Qu > 284/(Lc1,42) litres par minute et par mètre de largeur de bande, en particulier Qu > 2*284/(Lc1,42) litres par minute et par mètre de largeur de bande, sans toutefois dépasser Qu = 7*284/(Lc1,42) litres par minute et par mètre de largeur de bande, de préférence Qu < 4*284/(Lc1,42) litres par minute et par mètre de largeur de bande, et en ce qu'il est prévu une commande pilote ou une régulation, qui ajuste la différence entre la température de la bande d'acier (3) en sortie de la dernière cage de laminoir (F3) avant la section de refroidissement (1) et la température limite austénitique d'équilibre par régulation de la température de sortie pour qu'elle soit inférieure ou égale à 70 K, de préférence inférieure ou égale à 50 K, mieux encore inférieure à 25 K.
  16. Utilisation du train de laminage à chaud selon la revendication 15, caractérisée en ce que la commande pilote ou la régulation de la température de la bande d'acier (3) en sortie de la dernière cage de laminoir (F3) avant la section de refroidissement (1) est basée sur des tableaux dépendant de la qualité et/ou du taux de réduction ou sur de simples relations mathématiques dépendant de la qualité et/ou du taux de réduction entre le débit massique en largeur et la température d'entrée dans la première cage de laminoir (F1) .
  17. Utilisation du train de laminage à chaud selon la revendication 15 ou 16, caractérisée en ce que la section de refroidissement (1) est placée entre les avant-dernière (F4) et dernière (F5) cages de laminoir et/ou les troisième dernière (F3) et avant-dernière (F4) cages de laminoir.
  18. Utilisation du train de laminage à chaud selon l'une des revendications 15 à 17, caractérisée en ce que la longueur Lc de la section de refroidissement (1) représente entre 5 et 30% de la distance entre la cage de laminoir précédente (F3) et la cage de laminoir suivante (F4).
  19. Utilisation du train de laminage à chaud selon l'une des revendications 15 à 18, caractérisée en ce que la section de refroidissement (1) est agencée plus proche de la cage de laminoir précédente (F3) que de la cage de laminoir suivante (4), en particulier au moins de 20% plus proche de la cage de laminoir précédente que de la cage de laminoir suivante.
  20. Utilisation du train de laminage à chaud selon l'une des revendications 15 à 19, caractérisée en ce que la distance (Lg) entre cages de laminoir successives (F3, F4) entre lesquelles une section de refroidissement (1) est agencée est comprise entre 3,5 et 7 m.
  21. Utilisation du train de laminage à chaud selon l'une des revendications 15 à 20, caractérisée en ce que la largeur du train de laminage à chaud (F1-F5) et de la section de refroidissement (1) est conçue pour une largeur de bande de la bande d'acier (3) comprise entre 800 et 2200 mm.
  22. Utilisation du train de laminage à chaud selon l'une des revendications 15 à 21, caractérisée en ce que la section de refroidissement (1) est adaptée pour pouvoir utiliser comme liquide de refroidissement de l'eau avec une température d'application comprise entre 15°C et 60°C, de préférence entre 25°C et 40°C.
  23. Utilisation du train de laminage à chaud selon l'une des revendications 15 à 22, caractérisée en ce que le train de laminage à chaud est relié à une installation de coulée continue de manière que la bande d'acier (3), constituée d'un demi-produit coulé en continu, puisse être soumise à un laminage de finition au cours d'étapes se succédant directement.
  24. Utilisation du laminoir combiné comprenant un train de laminage à chaud selon la revendication 23, caractérisée en ce que le laminoir combiné comporte un train dégrossisseur avec une à quatre cages de laminoir, un dispositif de chauffage pour porter la bande d'acier en sortie du train dégrossisseur à une température supérieure à 1100°C, ainsi qu'un train de laminage à chaud avec trois à cinq cages de laminoir (F1-F5) pour le laminage de finition.
EP11715225.6A 2010-05-04 2011-04-18 Procédé de laminage à chaud de bandes d'acier et train de laminage à chaud Revoked EP2566989B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0075410A AT509707B1 (de) 2010-05-04 2010-05-04 Verfahren zum warmwalzen von stahlbändern und warmwalzstrasse
PCT/EP2011/056086 WO2011138159A1 (fr) 2010-05-04 2011-04-18 Procédé de laminage à chaud de bandes d'acier et train de laminage à chaud

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EP2566989A1 EP2566989A1 (fr) 2013-03-13
EP2566989B1 true EP2566989B1 (fr) 2014-02-26

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EP11715225.6A Revoked EP2566989B1 (fr) 2010-05-04 2011-04-18 Procédé de laminage à chaud de bandes d'acier et train de laminage à chaud

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EP (1) EP2566989B1 (fr)
KR (1) KR101506442B1 (fr)
CN (1) CN102859009B (fr)
AT (1) AT509707B1 (fr)
RU (1) RU2526644C2 (fr)
WO (1) WO2011138159A1 (fr)

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CN108994081B (zh) * 2018-06-25 2021-01-29 中冶赛迪工程技术股份有限公司 一种在esp生产线采用铁素体轧制生产低碳钢的方法
DE102019220033A1 (de) * 2019-03-18 2020-09-24 Sms Group Gmbh Anlage und Verfahren zur Herstellung von metallischem Warmband
CN110479762B (zh) * 2019-08-15 2020-10-30 武汉钢铁有限公司 一种用于铁素体轧制的热轧带钢全连续生产装置及方法
EP3808466A1 (fr) * 2019-10-16 2021-04-21 Primetals Technologies Germany GmbH Dispositif de refroidissement à rayonnement de refroidissement pourvu de section transversale creuse
DE102020214427A1 (de) 2020-04-01 2021-10-07 Sms Group Gmbh Verfahren zum Herstellen eines Warmbandes mittels einer Gießwalzanlage
CN113617836A (zh) * 2021-06-21 2021-11-09 日照钢铁控股集团有限公司 一种低能耗无头铁素体带钢生产的轧制工艺
CN113305519B (zh) * 2021-06-23 2022-02-01 泰安泰烁岩层控制科技有限公司 一种能够提高锚固效能的锚固杆的加工工艺及使用方法
CN115228929A (zh) * 2022-07-29 2022-10-25 广西广盛新材料科技有限公司 带钢生产的温度控制方法、装置、终端设备及存储介质

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Publication number Publication date
CN102859009B (zh) 2014-08-27
RU2526644C2 (ru) 2014-08-27
KR101506442B1 (ko) 2015-03-27
WO2011138159A1 (fr) 2011-11-10
RU2012151842A (ru) 2014-06-10
EP2566989A1 (fr) 2013-03-13
AT509707A4 (de) 2011-11-15
CN102859009A (zh) 2013-01-02
AT509707B1 (de) 2011-11-15
KR20130045862A (ko) 2013-05-06

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