EP1112128A1 - Method and device for producing hot-rolled strips and plates - Google Patents

Method and device for producing hot-rolled strips and plates

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Publication number
EP1112128A1
EP1112128A1 EP99969051A EP99969051A EP1112128A1 EP 1112128 A1 EP1112128 A1 EP 1112128A1 EP 99969051 A EP99969051 A EP 99969051A EP 99969051 A EP99969051 A EP 99969051A EP 1112128 A1 EP1112128 A1 EP 1112128A1
Authority
EP
European Patent Office
Prior art keywords
slab
temperature
heating furnace
cooling
continuous casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99969051A
Other languages
German (de)
French (fr)
Other versions
EP1112128B1 (en
Inventor
Udo Falkenreck
Uwe Quitmann
Harald Wehage
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
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SMS Demag AG
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Publication date
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Publication of EP1112128A1 publication Critical patent/EP1112128A1/en
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Publication of EP1112128B1 publication Critical patent/EP1112128B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • 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
    • 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

Definitions

  • the invention relates to a method for producing hot strip and sheet metal on a production plant, consisting of a continuous casting plant for slabs with a thickness between 100 and 180 mm and with an exit temperature from the
  • FFM Flexible Fiat Mill
  • the temperature of the slab after leaving the continuous casting plant is usually between 1000 ° C and 1150 ° C and decreases during transport to the heating furnace on the roller table.
  • the direct hot use in the heating furnace takes place at temperatures between 750 and 950 ° C.
  • the slab is heated evenly across thickness, width and length to material-dependent temperatures between 1050 and 1280 ° C.
  • Characteristic of the hot application is the fact that before the first forming in the rolling mill there is no or only a slight austenite-ferrite / per-lit transformation in the area close to the surface over the slab thickness if the surface temperatures change the transition temperatures during transport of the __
  • the method of hot use saves heating energy and time during the heating process compared to cold use.
  • the described method of hot use has proven itself for steels with a copper content of less than 0.3%. With higher copper contents in the steel, the copper released during the scale formation in the heating furnace accumulates at the grain boundaries of the primary austenite. Depending on the copper content, the heating temperature and scaling, these copper deposits at the grain boundaries can lead to material separations in the form of network-like cracks during the forming in the rolling mill.
  • EP 0686702 A1 it is proposed to solve the problem that also occurs in thin slab casting and rolling plants that the surface of the 40 - 70 mm thick thin slabs be lowered in a cooling section downstream of the continuous casting plant to temperatures below the Ar 3 temperature in such a way that in a near-surface area of at least 2 mm depth there is at least a 70% structural transformation of the austenite into ferrite / pearlite with reorientation of the austenite limits after reheating in the roller hearth furnace.
  • An average surface temperature should not fall below the martensite threshold of the respective material quality during cooling in the cooling section.
  • AIN precipitates during hot use are given as the cause of cracks in the rolling stock when rolling aluminum-quenched steels with 0.008-0.030% N and 0.03-0.25% Pb. Rapid cooling of the near-surface boundary layer of the blooms with structural transformation in the bainite region is recommended to suppress the AIN excretions. The rapid cooling takes place between the continuous caster and the heating furnace.
  • the device for rapid cooling is located between the continuous caster and the heating furnace.
  • a material-specific control and regulation of the cooling device is provided.
  • the described prior art has in common that the actual causes, processes or mechanisms that lead to cracks and material separations when using the hot insert in the process line continuous casting plant - heating / equalizing furnace - rolling mill have not yet been clearly clarified. It is possible to combine ⁇ several named causes.
  • the prior art proposes rapid cooling of the surface layer of the continuous casting material near the surface below the transition temperature with subsequent tempering by the heat flowing from the core. The risk of the surface temperature sometimes falling below the martensite threshold is present in all the patents mentioned, as shown in FIG. 1a with the solid line representing the prior art.
  • Fig. 1a shows the course of the surface temperature over time.
  • the devices for rapid cooling are proposed in the prior art locally between the continuous casting plant and the heating furnace or compensating furnace.
  • the partial conversion of the near-surface boundary layer into ferrite / pearlite is associated with a refinement and reorientation of the austenite limits after reheating, as can also be seen in FIGS. 1b and 2 on the course of the solid line representing the prior art.
  • the object of the present invention is to ensure that steels with higher contents of Cu, Al and N can also be processed in a combined hot strip / sheet metal production plant of the generic type described. According to the invention, it is proposed that between the continuous caster and the heating furnace only the surface layer of the previously descaled slab near the surface is formed in-line, recrystallized during and after the forming and then in several stages to a temperature below the A r3 - __
  • Cooling point is cooled and temporarily held until the structural transformation of the recrystallized fine-grained austenite in the ferrite / pearlite is completed.
  • the slab is formed with a total decrease of 5-15% and with a diameter-optimized rolling gap ratio l d / h m of less than 0.8.
  • the rolling speed corresponds to the casting speed.
  • the region of the continuous casting material near the surface in the roll gap of the respective stand of the rolling unit recrystallizes partially to completely dynamically, depending on the forming conditions.
  • a partial to complete static recrystallization of the deformed surface layer of the rolling stock near the surface takes place.
  • the temperature curve of the surface layer near the surface is shown in FIG. 1a with the dashed line.
  • the dynamic and static recrystallization results in grain refinement of the surface layer near the surface (see FIG. 1b, dashed line), ie the coarse-grained primary austenite has changed into a rolled fine-grained structure.
  • the intensity of the cooling section consisting of several nozzle groups is controlled and regulated so that the surface temperature of the slab neither reaches the bainite area nor falls below the martensite threshold of the respective material quality.
  • control and regulating systems control the media pressure of the nozzle groups of the cooling section as a function of the respective slab thickness and casting speed, the average temperature of the surface layer near the surface, while observing the cooling temperature and time necessary for a 100% structural change, as well as the bainite start temperature and the martensite start temperature regulate the respective material quality.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

A method for producing hot-rolled strip and plates in a production plant having a continuous casting installation for slabs 100-180 mm thick, descaling sprays, a single- or multiple-stand rolling unit with or without edging, a cooling interval, a heating furnace, and a Steckel mill. Between the continuous casting installation and the heating furnace, only the skin layer of the previously descaled slab is deformed in-line, recrystallized during and after deformation, and then cooled in several stages to a temperature below the Ar3 transformation point and temporarily maintained there until the microstructural transformation of the recrystallized, fine-grained austenite to ferrite/pearlite has been completed.

Description

Verfahren zur Erzeugung von Warmband und BlechenProcess for the production of hot strip and sheets
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zur Erzeugung von Warmband und Blechen auf einer Produktionsanlage, bestehend aus einer Stranggießanlage für Brammen mit einer Dicke zwischen 100 und 180 mm und mit einer Austrittstemperatur aus derThe invention relates to a method for producing hot strip and sheet metal on a production plant, consisting of a continuous casting plant for slabs with a thickness between 100 and 180 mm and with an exit temperature from the
Stranggießanlage oberhalb von 1000 °C, einem Anwärmofen und einem Steckelwalzwerk.Continuous caster above 1000 ° C, a heating furnace and a Steckel mill.
In einer unter dem Namen FFM (Flexible Fiat Mill) bekanntgewordenen Produktionsanlage für die Erzeugung sowohl von Warmband als auch von Blechen wird eine 100 - 180 mm dicke Bramme von der Stranggießanlage mit Hilfe eines Rollgangs direkt zum Anwärmofen transportiert, heiß eingesetzt und angewärmt und nach Verlassen des Anwärmofens in einem ein- oder mehrgerüstigem Steckelwalzwerk zu einem Band oder zu einem oder mehreren Blechen ausgewalzt.In a production plant known as FFM (Flexible Fiat Mill) for the production of both hot strip and sheet metal, a 100 - 180 mm thick slab is transported from the continuous casting plant with the help of a roller table directly to the heating furnace, used hot and warmed and after leaving of the heating furnace is rolled into a strip or one or more sheets in a single or multi-stand Steckel mill.
Üblicherweise liegt die Temperatur der Bramme nach dem Verlassen der Stranggießanlage zwischen 1000°C und 1150 °C und verringert sich während des Transportes zum Anwärmofen auf dem Rollgang. Der direkte Heißeinsatz in den Anwärmofen erfolgt bei Temperaturen zwischen 750 und 950 °C. Im Anwärmofen wird die Bramme gleichmäßig über Dicke, Breite und Länge auf materialabhängige Temperaturen zwischen 1050 und 1280 °C angewärmt. Kennzeichnend für den Heißeinsatz ist die Tatsache, daß vor der ersten Umformung in der Walzstraße über die Brammendicke keine oder nur eine geringfügige Austenit- Ferrit/Per lit-Umwandlung im oberfiächennahen Bereich stattfindet, wenn die Oberflächentemperaturen die Umwandlungstemperaturen beim Transport der __The temperature of the slab after leaving the continuous casting plant is usually between 1000 ° C and 1150 ° C and decreases during transport to the heating furnace on the roller table. The direct hot use in the heating furnace takes place at temperatures between 750 and 950 ° C. In the heating furnace, the slab is heated evenly across thickness, width and length to material-dependent temperatures between 1050 and 1280 ° C. Characteristic of the hot application is the fact that before the first forming in the rolling mill there is no or only a slight austenite-ferrite / per-lit transformation in the area close to the surface over the slab thickness if the surface temperatures change the transition temperatures during transport of the __
Bramme von der Stranggießanlage zum Anwärmofen nicht oder nur geringfügig und kurzzeitig unterschritten hat. Der mit der Erstarrung der Bramme entstandene grobkörnige Primäraustenit bleibt bis zur Umformung in der Walzstraße überwiegend erhalten. Die Austenitkomgröße kann im Anwärmofen materialabhängig und je nach Anwärmtechnologie noch wachsen.Slab from the continuous caster to the heating furnace has fallen below or only slightly and briefly. The coarse-grained primary austenite formed when the slab solidified remains largely intact until it is formed in the rolling mill. The austenite grain size can increase in the heating furnace depending on the material and depending on the heating technology.
Das Verfahren des Heißeinsatzes führt im Vergleich zum Kalteinsatz zur Einsparung von Anwärmenergie und -zeit während des Anwärmprozesses.The method of hot use saves heating energy and time during the heating process compared to cold use.
Das beschriebene Verfahren des Heißeinsatzes hat sich bewährt für Stähle mit einem Kupfergehalt kleiner als 0,3 %. Bei höheren Kupfergehalten im Stahl lagert sich das bei der Zunderbildung im Anwärmofen frei werdende Kupfer an den Korngrenzen des Primäraustenits an. In Abhängigkeit vom Kupfergehalt, der Anwärmtemperatur und Verzunderung können diese Kupferanlagerungen an den Korngrenzen während der Umformung im Walzwerk zu Materialtrennungen in Form von netzartigen Rissen führen.The described method of hot use has proven itself for steels with a copper content of less than 0.3%. With higher copper contents in the steel, the copper released during the scale formation in the heating furnace accumulates at the grain boundaries of the primary austenite. Depending on the copper content, the heating temperature and scaling, these copper deposits at the grain boundaries can lead to material separations in the form of network-like cracks during the forming in the rolling mill.
In EP 0686702 A1 wird zur Lösung des auch in Dünnbrammen-Gießwalzanlagen auftretenden Problems vorgeschlagen, die Oberfläche der 40 - 70 mm dicken Dünnbrammen in einer der Stranggießanlage nachgeordneten Kühlstrecke auf Temperaturen unterhalb der Ar3-Temperatur derart abzusenken, daß in einem oberflächennahen Bereich von mindestens 2 mm Tiefe eine mindestens 70%ige Gefügeumwandlung des Austenits in Ferrit/ Perlit mit Neuorientierung der Austenitkomgrenzen nach Wiedererwärmung im Rollenherdofen stattfindet. Eine mittlere Oberflächentemperatur soll bei der Abkühlung in der Kühlstrecke die Martensitschwelle der jeweiligen Materialgüte nicht unterschreiten. Insgesamt ist festzustellen, daß beim Stand der Technik beim Walzen von Blöcken, Knüppeln und Brammen bestimmter chemischer Zusammensetzung Risse bzw. Materialtrennungen auftreten, wenn das Verfahren des Heißeinsatzes in den Anwärmofen als direkte Kopplung von Stranggießanlage und Walzwerk angewendet^ wird.In EP 0686702 A1 it is proposed to solve the problem that also occurs in thin slab casting and rolling plants that the surface of the 40 - 70 mm thick thin slabs be lowered in a cooling section downstream of the continuous casting plant to temperatures below the Ar 3 temperature in such a way that in a near-surface area of at least 2 mm depth there is at least a 70% structural transformation of the austenite into ferrite / pearlite with reorientation of the austenite limits after reheating in the roller hearth furnace. An average surface temperature should not fall below the martensite threshold of the respective material quality during cooling in the cooling section. Overall, it can be stated that in the prior art, when blocks, billets and slabs of certain chemical composition are rolled, cracks or material separations occur if the method of hot use in the heating furnace is used as a direct coupling of the continuous casting plant and the rolling mill.
In JP 59-189001 wird für Knüppel aus Kohlenstoffstählen mit 5 - 100 ppm Bor, 0,03 - 0,15 % Schwefel und 0,5 - 2,0 % Silizium ebenfalls eine schnelle Abkühlung der oberflächennahen Randschicht im Bereich zwischen Stranggießanlage und Anwärmofen zur Vermeidung von Rissen im Walzgut während des Walzens vorgeschlagen.In JP 59-189001 for billets made of carbon steels with 5-100 ppm boron, 0.03-0.15% sulfur and 0.5-2.0% silicon, rapid cooling of the surface layer near the surface in the area between the continuous casting plant and the heating furnace is also provided Avoidance of cracks in the rolling stock proposed during rolling.
In EP 0587150 A1 werden AIN-Ausscheidungen während des Heißeinsatzes als Ursache für Risse im Walzgut beim Walzen von aluminium-beruhigten Stählen mit 0,008 - 0,030 % N und 0,03 - 0,25 % Pb angegeben. Empfohlen wird eine Schnellabkühlung der oberflächennahen Randschicht der Vorblöcke mit Gefügeumwandlung im Bainitgebiet zur Unterdrückung der AIN-Ausscheidungen. Die Schnellabkühlung findet zwischen Stranggießanlage und Anwärmofen statt.In EP 0587150 A1, AIN precipitates during hot use are given as the cause of cracks in the rolling stock when rolling aluminum-quenched steels with 0.008-0.030% N and 0.03-0.25% Pb. Rapid cooling of the near-surface boundary layer of the blooms with structural transformation in the bainite region is recommended to suppress the AIN excretions. The rapid cooling takes place between the continuous caster and the heating furnace.
Im US - Patent 56 34 512 werden Ausscheidungen von AI, V und N während des Heißeinsatzes als Ursache für Risse in Vorblöcken, Knüppeln und Brammen infolge von Zugspannungen bei der Abkühlung an Luft benannt. Vorgeschlagen wird ebenfalls eine Schnellabkühlung einer oberflächennahen Randschicht von mindestens 10 mm auf eine Temperatur von 400 °C mit anschließendemIn the US patent 56 34 512 excretions of AI, V and N during hot use are named as the cause of cracks in blooms, billets and slabs as a result of tensile stresses during cooling in air. It is also proposed to rapidly cool a surface layer near the surface of at least 10 mm to a temperature of 400 ° C. with subsequent
Selbstanlassen auf 900 °C durch nachfließende Wärme aus dem Kernbereich. Die Einrichtung zur Schnellabkühlung befindet sich zwischen Stranggießanlage und Anwärmofen. Eine materialspezifische Steuerung und Regelung der Abkühleinrichtung ist vorgesehen. Dem geschilderten Stand der Technik ist gemeinsam, daß die eigentlichen Ursachen, Vorgänge bzw. Mechanismen, die zu Rissen und Materialtrennungen bei Nutzung des Heißeinsatzes in der Prozeßlinie Stranggießanlage - Anwärm-/ Ausgleichofen - Walzwerk führen, bisher nicht eindeutig geklärt sind. Die Möglichkeit der Kombination^ mehrerer genannter Ursachen ist gegeben. Generell wird jedoch beim Stand der Technik eine Schnellabkühlung der oberflächennahen Randschicht des Stranggußmaterials unter die Umwandlungstemperatur mit anschließendem Anlassen durch nachfließende Wärme aus dem Kern vorgeschlagen. Die Gefahr der teilweisen Unterschreitung der Oberflächentemperatur unter die Martensitschwelle ist bei allen genannten Patenten gegeben, wie in Figur 1a mit der durchgezogenen, den Stand der Technik darstellenden Linie gezeigt ist. Fig.1a zeigt den Verlauf der Oberflächentemperatur über der Zeit.Self-tempering to 900 ° C due to the flowing heat from the core area. The device for rapid cooling is located between the continuous caster and the heating furnace. A material-specific control and regulation of the cooling device is provided. The described prior art has in common that the actual causes, processes or mechanisms that lead to cracks and material separations when using the hot insert in the process line continuous casting plant - heating / equalizing furnace - rolling mill have not yet been clearly clarified. It is possible to combine ^ several named causes. In general, however, the prior art proposes rapid cooling of the surface layer of the continuous casting material near the surface below the transition temperature with subsequent tempering by the heat flowing from the core. The risk of the surface temperature sometimes falling below the martensite threshold is present in all the patents mentioned, as shown in FIG. 1a with the solid line representing the prior art. Fig. 1a shows the course of the surface temperature over time.
Die Einrichtungen zur Schnellabkühlung werden beim Stand der Technik örtlich zwischen der Stranggießanlage und dem Anwärmofen bzw. Ausgleichofen vorgeschlagen. Die partielle Umwandlung der oberflächennahen Randschicht in Fer rit/Perlit ist mit einer Komfeinung und Neuorientierung der Austenitkomgrenzen nach Wiedererwärmung verbunden, wie in Figuren 1b und 2, ebenfalls am Verlauf der durchgezogenen, den Stand der Technik darstellenden Linie zu erkennen ist.The devices for rapid cooling are proposed in the prior art locally between the continuous casting plant and the heating furnace or compensating furnace. The partial conversion of the near-surface boundary layer into ferrite / pearlite is associated with a refinement and reorientation of the austenite limits after reheating, as can also be seen in FIGS. 1b and 2 on the course of the solid line representing the prior art.
Untersuchungen haben ferner gezeigt, daß bei Stählen mit einem Kupfergehalt größer als 0,3 % und 0,02 - 0,05 % AI sowie 0,008 - 0,020 % N und einem Kupfer/Nickel-Verhältnis größer als 3 ungeachtet einer Schnellabkühlung der oberflächennahen Randschicht einer Bramme mit partieller Gefügeumwandlung nach der Stranggießanlage und vor Einsatz in den Anwärmofen Risse bzw. Materialtrennungen beim nachfolgenden Walzen der Bramme zu Bändern und Blechen auftreten.Investigations have also shown that for steels with a copper content greater than 0.3% and 0.02-0.05% Al and 0.008-0.020% N and a copper / nickel ratio greater than 3 regardless of rapid cooling of the surface layer near the surface Slab with partial structural change after the continuous caster and before use in the heating furnace cracks or material separations occur during the subsequent rolling of the slab into strips and sheets.
Aufgabe der vorliegenden Erfindung ist es sicherzustellen, daß in einer kombinierten Warmband/Blech-Produktionsanlage der beschriebenen gattungsgemäßen Art auch Stähle mit höheren Gehalten an Cu, AI und N ohne Nachteile verarbeitet werden können. Erfindungsgemäß wird vorgeschlagen, daß zwischen Stranggießanlage und Anwärmofen nur die oberflächennahe Randschicht der zuvor entzunderten Bramme in-line umgeformt wird, während und nach der Umformung rekristallisiert und anschließend mehrstufig auf eine Temperatur unterhalb des Ar3- __The object of the present invention is to ensure that steels with higher contents of Cu, Al and N can also be processed in a combined hot strip / sheet metal production plant of the generic type described. According to the invention, it is proposed that between the continuous caster and the heating furnace only the surface layer of the previously descaled slab near the surface is formed in-line, recrystallized during and after the forming and then in several stages to a temperature below the A r3 - __
Umwandlungspunktes abgekühlt und zeitweise gehalten wird, bis die Gefügeumwandlung des rekristallisierten feinkörnigen Austenits im Ferrit/ Perlit abgeschlossen ist.Cooling point is cooled and temporarily held until the structural transformation of the recrystallized fine-grained austenite in the ferrite / pearlite is completed.
Vorrichtungstechnisch bedeutet das, daß vor dem Einsatz der Bramme in den Anwärmofen eine Oberflächenverformungsgruppe bestehend aus einem Zunderwäscher, einer ein- oder mehrgerüstigen Walzeinheit mit oder ohne integrierten Staucher und einer Steuer- und regelbaren Kühlstrecke durchlaufen wird. Im Zunderwäscher wird die Oberfläche vollständig entzundert.In terms of device technology, this means that before the slab is used in the heating furnace, a surface deformation group consisting of a scale washer, a single or multi-stand rolling unit with or without an integrated edger and a controllable and controllable cooling section is run through. The surface is completely descaled in the scale washer.
In einer Weiterbildung der Erfindung ist vorgesehen, daß die Bramme mit einer Gesamtabnahme von 5 - 15 % und mit einem durchmesseroptimierten Waizspaltverhältnis ld/hm kleiner als 0,8 umgeformt wird. Die Walzgeschwindigkeit entspricht der Gießgeschwindigkeit. Durch Optimierung des bzw. der Walzendurchmesser und der Abnahme wird das vorgeschlagene Walzspaltverhältnis von gedrückter Länge zu mittlerer Walzguthöhe so eingestellt, daß nach einem anderen Merkmal der Erfindung der oberflächennaher Breich durch Wahl der Abnahme und des Waizspaltverhältnisses einer Dicke von maximal einem Viertel der Brammendicke entspricht, während der Kernbereich nahezu unverformt bleibt.In a development of the invention it is provided that the slab is formed with a total decrease of 5-15% and with a diameter-optimized rolling gap ratio l d / h m of less than 0.8. The rolling speed corresponds to the casting speed. By optimizing the roll diameter (s) and the decrease, the proposed roll gap ratio from the pressed length to the medium rolling stock height is set such that, according to another feature of the invention, the area close to the surface corresponds to a maximum thickness of a quarter of the slab thickness by choosing the decrease and the roll gap ratio. while the core area remains almost undeformed.
Durch die Verformung rekristallisiert der oberflächennahe Bereich des Stranggußmaterials im Walzspalt des jeweiligen Gerüstes der Walzeinheit in Abhängigkeit von den Umformbedingungen teilweise bis vollständig dynamisch. Nach Austritt aus dem Walzspalt des jeweiligen Gerüstes der Walzeinheit findet eine teilweise bis vollständige statische Rekristallisation der verformten oberflächennahen Randschicht des Walzgutes statt. Den Temperaturverlauf der oberflächennahen Randschicht zeigt Figur 1a mit der gestrichelten Linie. Durch die dynamische und statische Rekristallisation erfolgt eine Kornfeinung der oberflächennahen Randschicht (vgl. Figur 1b, gestrichelte Linie), d.h. der grobkörnige Primäraustenit ist in eine gewalzte feinkörnige Struktur übergegangen.As a result of the deformation, the region of the continuous casting material near the surface in the roll gap of the respective stand of the rolling unit recrystallizes partially to completely dynamically, depending on the forming conditions. After emerging from the roll gap of the respective stand of the rolling unit, a partial to complete static recrystallization of the deformed surface layer of the rolling stock near the surface takes place. The temperature curve of the surface layer near the surface is shown in FIG. 1a with the dashed line. The dynamic and static recrystallization results in grain refinement of the surface layer near the surface (see FIG. 1b, dashed line), ie the coarse-grained primary austenite has changed into a rolled fine-grained structure.
Zur Vermeidung von Kornwachstum in der oberflächennahen Randschicht aufgrund der noch hohen Temperaturen zwischen 850 und 1050 °C wird diese nach Abschluß der Rekristallisation in einer Kühlstrecke mehrstufig abgekühlt. Bei dieser Abkühlung wird gleichzeitig die Ar3-Umwandlungstemperatur unterschritten, wodurch das durch das Walzen rekristallisierte und gefeinte Korn der oberflächennahen Randschicht im Vergleich zur herkömmlichen Methode 1 bedeutend schneller und zu einem noch feinerem ferritisch/perlitischen Gefüge umwandelt (vgl. Figuren 1 und 2).In order to avoid grain growth in the surface layer near the surface due to the still high temperatures between 850 and 1050 ° C., this is cooled in several stages in a cooling section after the recrystallization has been completed. This cooling simultaneously falls below the A r3 transformation temperature, as a result of which the grain of the surface layer near the surface, which has been recrystallized and refined by rolling, converts significantly faster and to an even finer ferritic / pearlitic structure in comparison to conventional method 1 (see FIGS. 1 and 2). .
Erfindungsgemäß wird die Intensität der aus mehreren Düsengruppen bestehenden Kühlstrecke so gesteuert und geregelt wird, daß die Oberflächentemperatur der Bramme weder das Bainitgebiet erreicht noch die Martensitschwelle der jeweiligen Materialgüte unterschreitet.According to the invention, the intensity of the cooling section consisting of several nozzle groups is controlled and regulated so that the surface temperature of the slab neither reaches the bainite area nor falls below the martensite threshold of the respective material quality.
Die mehrstufige Abkühlung der oberflächennahen Randschicht erfolgt solange, bis eine 100 %ige Umwandlung des rekristallisierten und gefeinten Austenitkorns in Ferrit/Perlit erfolgt ist. Dazu ist vorgesehen, daß Steuer- und Regelsysteme den Mediendruck der Düsengruppen der Kühlstrecke in Abhängigkeit von der jeweiligen Brammendicke und Gießgeschwindigkeit, der mittleren Temperatur der oberflächennahen Randschicht unter Einhaltung der für eine 100 %ige Gefügeumwandlung notwendigen Abkühltemperatur und -zeit sowie der Bainitstarttemperatur und der Martensitstarttemperatur der jeweiligen Materialgüte regulieren.The multi-stage cooling of the surface layer near the surface continues until a 100% conversion of the recrystallized and refined austenite grain into ferrite / pearlite has taken place. For this purpose, it is provided that control and regulating systems control the media pressure of the nozzle groups of the cooling section as a function of the respective slab thickness and casting speed, the average temperature of the surface layer near the surface, while observing the cooling temperature and time necessary for a 100% structural change, as well as the bainite start temperature and the martensite start temperature regulate the respective material quality.
Durch die Kombination von Umformung der oberflächennahen Randschicht mit deren stufenweisen Kühlung unter die Ar3-Umwandlungstemperatur entsteht ein bedeutend feinkörnigeres ferritisch/perlitisches Gefüge bis zum Einsatz der Bramme in den Anwärmofen im Vergleich zu herkömmlichen Methoden (vgl. Figur 1b). Dadurch ist auch eine vollständige Neuorientierung der Austenitkorngrenzen mit einem bedeutend feineren Korn infolge Gefügeumwandlung während der Wiedererwärmung gegeben. Durch die vollständige Neuorientierung der Austenitkorngrenzen bei bedeutend feinerem Korn können Stähle mit einem Kupfergehalt größer als 0,3 % und Zusätzen von AI und N sowie einem Kupfer/Nickel-Verhältnis größer als 3 im Heißeinsatz auf der beschriebenen Produktionsanlage verarbeitet werden. The combination of reshaping the surface layer near the surface with its gradual cooling below the A r3 transformation temperature results in a significantly more fine-grained ferritic / pearlitic structure up to the use of the slab in the heating furnace compared to conventional methods (see Figure 1b). This also means that the austenite grain boundaries are completely reoriented with a significantly finer grain as a result of structural changes during reheating. Due to the complete reorientation of the austenite grain boundaries with significantly finer grain, steels with a copper content greater than 0.3% and additions of Al and N and a copper / nickel ratio greater than 3 can be processed in hot operation on the production plant described.

Claims

Patentansprüche claims
1. Verfahren für die Erzeugung von Warmband und Blechen in einer Produktionsanlage, bestehend aus einer Stranggießanlage für Brammen zwischen 100 und 180 mm Dicke, einem Zunderwäscher, einer ein- oder __ mehrgerüstigen Walzeinheit mit oder ohne integriertem Staucher, einer Kühlstrecke, einem Anwärmofen und einem Steckelwalzwerk, dadurch gekennzeichnet, daß zwischen Stranggießanlage und Anwärmofen nur die oberflächennahe Randschicht der zuvor entzunderten Bramme in-line umgeformt wird, während und nach der Umformung rekristallisiert und anschließend mehrstufig auf eine Temperatur unterhalb des Ar3-Umwandlungspunktes abgekühlt und zeitweise gehalten wird, bis die Gefügeumwandlung des rekristallisierten feinkörnigen Austenits im Ferrit/Perlit abgeschlossen ist.1.Procedure for the production of hot strip and sheets in a production plant, consisting of a continuous casting plant for slabs between 100 and 180 mm thick, a scale washer, a single or __ multi-stand rolling unit with or without an integrated edger, a cooling section, a heating furnace and one Steckel rolling mill, characterized in that between the continuous caster and the heating furnace only the surface layer of the previously descaled slab near the surface is formed in-line, recrystallized during and after the forming and then cooled in several stages to a temperature below the A r3 conversion point and temporarily held until the Structural transformation of the recrystallized fine-grained austenite in the ferrite / pearlite is completed.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Bramme mit einer Gesamtabnahme von 5 - 15 % und mit einem durchmesseroptimierten Walzspaltverhältnis ld/hm kleiner als 0,8 umgeformt wird.2. The method according to claim 1, characterized in that the slab is formed with a total decrease of 5 - 15% and with a diameter-optimized roll gap ratio l d / h m less than 0.8.
3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der umgeformte oberflächennahe Bereich durch Wahl der Abnahme und des Walzspaltverhältnisses einer Dicke von maximal einem Viertel der3. The method according to claim 1 and 2, characterized in that the reshaped area near the surface by choosing the decrease and the roll gap ratio of a thickness of a maximum of a quarter
Brammendicke entspricht.Slab thickness corresponds.
4. Verfahren nach Anspruch 1 und 3, dadurch gekennzeichnet, daß die Intensität der aus mehreren Düsengruppen bestehenden Kühlstrecke so gesteuert und geregelt wird, daß die Oberflächentemperatur der Bramme weder das Bainitgebiet erreicht noch die Martensitschwelle der jeweiligen Materialgüte unterschreitet. 4. The method according to claim 1 and 3, characterized in that the intensity of the cooling section consisting of several nozzle groups is controlled and regulated so that the surface temperature of the slab neither reaches the bainite region nor falls below the martensite threshold of the respective material quality.
5. Verfahren nach Anspruch 1 und 4, dadurch gekennzeichnet, daß Steuer- und Regelsysteme den Mediendruck der Düsengruppen der Kühlstrecke in Abhängigkeit von der jeweiligen Brammendicke und Gießgeschwindigkeit, der mittleren Temperatur der oberflächennahen Randschicht unterEinhaltung der für eine 100 %ige Gefügeumwandlung notwendigen Abkühltemperatur und -zeit sowie der Bainitstarttemperatur und der Martensitstarttemperatur der jeweiligen Materialgüte regulieren.5. The method according to claim 1 and 4, characterized in that control systems regulate the media pressure of the nozzle groups of the cooling section as a function of the respective slab thickness and casting speed, the average temperature of the near-surface surface layer while maintaining the cooling temperature and - necessary for a 100% structural transformation. regulate the time and the bainite start temperature and the martensite start temperature of the respective material quality.
Figuren 1a und b sowie 2 Figures 1a and b and 2nd
EP99969051A 1998-09-14 1999-09-08 Method and device for producing hot-rolled strips and plates Expired - Lifetime EP1112128B1 (en)

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DE19843200 1998-09-14
DE19843200A DE19843200C1 (en) 1998-09-14 1998-09-14 Method for producing hot rolled strip and sheet
PCT/DE1999/002866 WO2000015362A1 (en) 1998-09-14 1999-09-08 Method and device for producing hot-rolled strips and plates

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EP3769862A1 (en) * 2019-07-24 2021-01-27 Primetals Technologies Austria GmbH Method for producing a deep-drawable ready-made strip made of steel in a casting roller composite system
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EP1112128B1 (en) 2003-01-02
CN1142038C (en) 2004-03-17

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