EP1633894A2 - Method and installation for the production of hot-rolled strip having a dual-phase structure - Google Patents

Method and installation for the production of hot-rolled strip having a dual-phase structure

Info

Publication number
EP1633894A2
EP1633894A2 EP04739698A EP04739698A EP1633894A2 EP 1633894 A2 EP1633894 A2 EP 1633894A2 EP 04739698 A EP04739698 A EP 04739698A EP 04739698 A EP04739698 A EP 04739698A EP 1633894 A2 EP1633894 A2 EP 1633894A2
Authority
EP
European Patent Office
Prior art keywords
cooling
strip
temperature
ferrite
hot
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
EP04739698A
Other languages
German (de)
French (fr)
Other versions
EP1633894B1 (en
Inventor
Karl-Ernst Hensger
Wolfgang Hennig
Tillmann BÖCHER
Christian Bilgen
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 Group GmbH
ArcelorMittal Sestao SL
Original Assignee
SMS Demag AG
Aceria Compacta de Bizkaia SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=33546580&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1633894(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SMS Demag AG, Aceria Compacta de Bizkaia SA filed Critical SMS Demag AG
Publication of EP1633894A2 publication Critical patent/EP1633894A2/en
Application granted granted Critical
Publication of EP1633894B1 publication Critical patent/EP1633894B1/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the invention relates to a method for producing hot strip with a dual-phase structure made of ferrite and martensite, wherein at least 70% of the austenite is converted into ferrite from the hot-rolled state by controlled two-stage cooling after the finish rolling to a strip temperature below the martensite start temperature in one Cooling section from water cooling groups arranged one behind the other.
  • the targeted structural transformation by means of a controlled cooling of the steels is known, and for the production of dual-phase steels this controlled cooling is carried out after the hot strip has been formed.
  • the setting of the achievable dual-phase structure essentially depends on the cooling speeds that are technically possible in the system and the chemical composition of the steel. In any case, it is important to have sufficient ferrite formation of at least 70% in the first cooling stage. During this first cooling stage, conversion of the austenite in the pearlite stage should be avoided.
  • the cooling capacity of the second cooling stage following the first cooling stage must be large enough that reel temperatures below the martensite start temperature are reached. Only then is the formation of a dual phase structure with ferritic and martensitic components ensured.
  • EP 0 747 495 B1 describes a process for producing high-strength steel sheet with a structure of at least 75% ferrite, at least 10% martensite and optionally bainite and residual austenite. It is therefore not a structure of pure dual-phase steels.
  • a steel micro-alloyed with niobium is used as the alloy.
  • the hot-rolled steel sheet is specifically cooled, with slow cooling being followed by rapid cooling, or alternatively, the slow cooling is first preceded by rapid cooling.
  • Specified point and 730 0 C - for the first cooling stage a cooling 2-15 ° C / s within a period of 8 to 40 seconds cooling time to a final temperature between the An is.
  • the second cooling stage is conducted at a cooling rate of 20 to 150 0 CVs up to a temperature of 300 0 C.
  • the rapid cooling which alternatively precedes the slow cooling, is carried out at a cooling rate of 20 to 150 ° C./s below the Ar 3 point.
  • EP 1 108 072 B1 describes a process for the production of dual-phase steels, in which after the finish rolling with a two-stage cooling - first slowly, then quickly - a two-phase structure made of 70 to 90% ferrite and 30 to 10% martensite is achieved.
  • the first (slow) cooling is carried out in a cooling section in which the hot strip is cooled in a defined manner by water cooling zones arranged one behind the other at a cooling rate of 20 - 30 K / s.
  • the cooling is set so that the cooling curve enters the ferrite area at such a high temperature that the ferrite can form quickly.
  • This first cooling is continued until at least 70% of the austenite has been converted into ferrite before the further (rapid) cooling follows immediately and without a holding time.
  • the object of the invention to provide a method and a system with or in which the production of hot strip with dual-phase structures in a conventional casting and rolling plant with the local conditions given there and thus time restrictions can also be implemented.
  • the cooling section of such a system is characterized in that the total length generally does not exceed 50 m and no compact cooling is provided.
  • the cooling strategy provides for two-stage cooling with optionally different cooling speeds, which is interrupted by an isothermal holding time of a maximum of 5 seconds.
  • the start of the holding time which corresponds to the end of the first cooling stage, is determined by the entry of the cooling curve into the ferrite area or the start of the austenite transformation into ferrite.
  • the short isothermal cooling pause of a maximum of 5 seconds during which the conversion heat released according to the invention is used to keep the temperature at a constant value and an inevitable cooling of the air is compensated for, the total targeted conversion of the austenite to at least 70% ferrite takes place.
  • the second cooling stage is followed in this holding period immediately by a cooling of the hot strip to a temperature below 300 0 C. Since this temperature is below the martensite start temperature is then held at this cooling with martensite, the second structure component at the desired height.
  • the cooling strategy is determined by a precisely defined, predetermined cooling rate for both cooling stages.
  • these cooling speeds it should be noted that a cooling speed of less than 30 K / s is not possible because of the short time available in the conventional cooling section of a casting and rolling mill, while cooling speeds greater than 150 K / s cannot be achieved in such cooling sections either.
  • the method according to the invention is distinguished not only by a different is sponding chemical composition of the base steel is characterized in that a) the final rolling temperature is well below the A 3 temperature, b) in the second cooling stage to a temperature below 300 0 C cooled, c) the cooling rate below 150 K / s and are above 30 K / s, d) between the two cooling stages there is a very short holding time with a maximum of 5 seconds during which no cooling takes place, e) the conversion to ferrite is isothermal.
  • a plant for carrying out the method of the invention is characterized by a conventional cooling section of a casting and rolling plant, which is arranged behind the last finishing roll stand and has a plurality of controllable water cooling groups with water cooling bars arranged at a distance from one another.
  • the cooling beams in each cooling group are arranged in such a way that a certain amount of water is applied uniformly to the top and bottom of the hot strip.
  • the total amount of water can be regulated by switching individual cooling beams on or off during the rolling process.
  • the number and arrangement of the connected water cooling beams can be variably set in advance in order to optimally adapt the entire cooling section to the cooling conditions to be set
  • FIG. 1 is a time-temperature cooling curve of a hot strip
  • 2 shows a layout of a cooling section in a casting and rolling plant with a 6-stand finishing train
  • FIG. 3 shows a layout of a cooling section in a casting and rolling plant with a 7-stand finishing train.
  • FIG. 1 shows an example of a cooling curve with the time-temperature profile of a hot strip which was cooled in a cooling section 1 on the outlet roller table by the method according to the invention.
  • the hot-rolled strip having the composition: 0.06% C, 0.1% Si, 1, 2% Mn, 0.015% P, 0.06% S, 00.036% Al, 0.15% Cu, 0.054% Ni 1 0, 71% Cr 1 rest Fe and usual accompanying elements were cooled from a set final rolling temperature T fl ni s h of 800 0 C in a first cooling stage with a cooling rate Vi of 54 K / s to a temperature of the hot strip of 670 0 C, at which the Cooling curve entered the ferrite area.
  • FIG. 2 shows an example of the layout of a cooling section 1 of a conventional casting and rolling system designed according to the invention.
  • the cooling section 1 traversed by the hot strip 10 in the transport direction 8 is located between the last finishing stand 2 and the reel 5. Between the last finishing stand 2 and the first water cooling group 3i there is a temperature measuring point 6 for checking the temperature of the hot strip 10 entering the cooling section 1.
  • 2 consists of a total of eight cooling groups 3-
  • FIG. 2 is the typical layout of a cooling section for a 6-stand casting and rolling system, which can be seen from the gap between the cooling groups 3 7 and 4.
  • the subsequent expansion to a 7-stand finishing train often means that, for example, the first cooling group (cooling zone) 3i has to be moved backwards into the structural gap between cooling groups 3 7 and 4.
  • a layout of a cooling section 1 'according to FIG. 3 which differs from the layout of the cooling section 1 of FIG. 2 only in that this structural gap between the cooling groups 3 7 and 4 is eliminated. 3 therefore correspond to the corresponding reference numerals in FIG. 2.
  • An exception is the first cooling group 3i ', whose upper cooling bar, in contrast to the cooling bar of cooling group 3i in FIG. 2, has the usual length of cooling groups 3 2 to 3 7 is formed.
  • each cooling group has four chilled beams on both the top and bottom.
  • Each chilled beam in turn consists of two rows of water tubes for cooling the upper side 10 'and the lower side 10 "of the belt.
  • the cooling group 3i shown in FIG. 2 is shortened by one chilled beam on the upper side for reasons of space.
  • the trimming zone 4 has two valves 7 for each beam. This means that each row of cooling tubes can be controlled individually in the trim zone and the water volume can thus be regulated more precisely.
  • the speed of the strip running out of the finishing train changes and the driving style of the cooling section must be adjusted accordingly in order to adjust the strip properties to be able to set the required time-temperature control.
  • the first necessary cooling stage is achieved with the cooling groups 3i and 3 2
  • the second cooling stage is realized with the groups 3s, 3 6 , 3 7 and 4.
  • the cooling groups 36, 3 7 and 4 are used for the second cooling stage due to the changed boundary conditions.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The aim of the invention is to be able to produce dual-phase steels under local conditions even in the existing cooling section of a continuous casting and rolling plant by means of controlled cooling of the hot-rolled strip in two cooling stages following the forming process. Said aim is achieved by respecting the chemical composition of the initial steel within precisely defined limits and cooling in two stages from a finished rolled strip temperature Tfinish of A3 -100K < Tfinish < A3 -50K to a coiling strip temperature Tcoiling of < 300 °C (< initial martensite temperature), the cooling speed V1,2 in both cooling stages ranging between 30 and 150 K/s, preferably between 50 and 90 K/s. The first cooling stage is carried out until the cooling curve enters the ferrite range, whereupon the heat released by the transformation of the austenite into ferrite is used for isothermally holding the obtained strip temperature Tconst during a holding time of = 5 s until the beginning of the second cooling stage.

Description

Verfahren und Anlage zur Herstellung von Warmband mit DualphasengefügeProcess and plant for the production of hot strip with dual-phase structure
Die Erfindung betrifft ein Verfahren zur Herstellung von Warmband mit einem Dualphasengefüge aus Ferrit und Martensit, wobei mindestens 70 % des Austenits in Ferrit umgewandelt sind, aus dem warmgewalzten Zustand durch eine kontrollierte zweistufige Abkühlung nach dem Fertigwalzen auf eine Bandtemperatur unterhalb der Martensit-Starttemperatur in einer Kühlstrecke aus mit Abstand hintereinander angeordneten Wasserkühlgruppen.The invention relates to a method for producing hot strip with a dual-phase structure made of ferrite and martensite, wherein at least 70% of the austenite is converted into ferrite from the hot-rolled state by controlled two-stage cooling after the finish rolling to a strip temperature below the martensite start temperature in one Cooling section from water cooling groups arranged one behind the other.
Die gezielte Gefügeumwandlung durch eine gesteuerte Abkühlung der Stähle ist bekannt, wobei zur Herstellung von Dualphasenstählen diese gesteuerte Abkühlung zeitlich nach der erfolgten Umformung des Warmbandes durchgeführt wird. Die Einstellung des erreichbaren Dualphasengefüges hängt dabei wesentlich von den anlagentechnisch möglichen Abkühlgeschwindigkeiten und der chemischen Zusammensetzung des Stahles ab. Wichtig ist dabei in jedem Fall eine ausreichende Ferritbildung von mindestens 70 % in der ersten Kühlstufe. Während dieser ersten Kühlstufe sollte dabei eine Umwandlung des Austenits in der Perlitstufe vermieden werden.The targeted structural transformation by means of a controlled cooling of the steels is known, and for the production of dual-phase steels this controlled cooling is carried out after the hot strip has been formed. The setting of the achievable dual-phase structure essentially depends on the cooling speeds that are technically possible in the system and the chemical composition of the steel. In any case, it is important to have sufficient ferrite formation of at least 70% in the first cooling stage. During this first cooling stage, conversion of the austenite in the pearlite stage should be avoided.
Die Kühlkapazität der an die erste Kühlstufe anschließenden zweiten Kühlstufe muss so groß sein, dass Haspeltemperaturen unterhalb der Martensit- Starttemperatur erreicht werden. Nur dann ist die Bildung eines Dualphasengefüges mit ferritischen und martensitischen Bestandteilen sichergestellt.The cooling capacity of the second cooling stage following the first cooling stage must be large enough that reel temperatures below the martensite start temperature are reached. Only then is the formation of a dual phase structure with ferritic and martensitic components ensured.
Die bekannte Herstellung von Dualphasenstählen ist unproblematisch bei kleinen Bandgeschwindigkeiten bzw. bei ausreichend langen Kühlstrecken. Bei sehr hohen Bandgeschwindigkeiten kann allerdings der Beginn der zweiten Kühlstufe so weit in der vorhandenen Kühlstrecke verschoben sein, dass die anschließende Martensitbildung nur noch unvollkommen erfolgt oder gänzlich ausbleibt. Es entsteht dann ein Mischgefüge aus Ferrit, Bainit und Anteilen anThe known production of dual-phase steels is unproblematic at low strip speeds or with sufficiently long cooling sections. At very high belt speeds, however, the start of the second cooling stage can be shifted so far in the existing cooling section that the subsequent formation of martensite takes place only incompletely or does not occur at all. A mixed structure of ferrite, bainite and proportions is then formed
BESTATIGUNGSKOPIE Martensit, das die angestrebten mechanischen Eigenschaften reiner Dualpha- sengefüge nicht erreicht.BESTATIGUNGSKOPIE Martensite that does not achieve the desired mechanical properties of pure dual-phase structure.
In der EP O 747 495 B1 wird ein Verfahren zur Herstellung von Stahlblech hoher Festigkeit beschrieben mit einer Struktur von wenigstens 75 % Ferrit, wenigstens 10 % Martensit und gegebenenfalls Bainit und Restaustenit. Es handelt sich demnach nicht um ein Gefüge reiner Dualphasenstähle. Als Legierung wird ein mit Niob mikrolegierter Stahl verwendet. Zu seiner Herstellung wird das warmgewalzte Stahlblech gezielt gekühlt, wobei einer langsamen Abkühlung eine schnelle Abkühlung folgt oder alternativ der langsamen Abkühlung zunächst eine schnelle Abkühlung vorangestellt wird. Für die erste Kühlstufe wird eine Abkühlgeschwindigkeit von 2 bis 15 °C/s innerhalb einer Zeitspanne von 8 bis 40 Sekunden Abkühldauer bis zu einer Endtemperatur zwischen dem An - Punkt und 730 0C angegeben. Die zweite Kühlstufe wird mit einer Abkühlgeschwindigkeit von 20 bis 150 0CVs bis zu einer Temperatur von 300 0C geführt. Die alternativ der langsamen Abkühlung vorangestellte schnelle Abkühlung wird mit einer Abkühlgeschwindigkeit von 20 bis 150 °C/s bis unterhalb des Ar3 - Punktes geführt.EP 0 747 495 B1 describes a process for producing high-strength steel sheet with a structure of at least 75% ferrite, at least 10% martensite and optionally bainite and residual austenite. It is therefore not a structure of pure dual-phase steels. A steel micro-alloyed with niobium is used as the alloy. For its manufacture, the hot-rolled steel sheet is specifically cooled, with slow cooling being followed by rapid cooling, or alternatively, the slow cooling is first preceded by rapid cooling. Specified point and 730 0 C - for the first cooling stage a cooling 2-15 ° C / s within a period of 8 to 40 seconds cooling time to a final temperature between the An is. The second cooling stage is conducted at a cooling rate of 20 to 150 0 CVs up to a temperature of 300 0 C. The rapid cooling, which alternatively precedes the slow cooling, is carried out at a cooling rate of 20 to 150 ° C./s below the Ar 3 point.
In der EP 1 108 072 B1 wird ein Verfahren zur Herstellung von Dualphasen- Stählen beschrieben, bei dem nach dem Fertigwalzen mit einer zweistufigen Abkühlung - zunächst langsam, dann schnell -, ein zweiphasiges Gefüge aus 70 bis 90 % Ferrit und 30 bis 10 % Martensit erreicht wird. Die erste (langsame) Kühlung wird in einer Kühlstrecke durchgeführt, in der das Warmband durch mit Abstand hintereinander angeordneten Wasserkühlzonen mit einer Abkühlgeschwindigkeit von 20 - 30 K/s definiert gekühlt wird. Die Abkühlung ist dabei so eingestellt, dass die Abkühlkurve mit einer noch so hohen Temperatur in das Ferritgebiet einläuft, dass die Ferritbildung schnell erfolgen kann. Diese erste Kühlung wird so lange fortgesetzt, bis mindestens 70 % des Austenits in Ferrit umgewandelt sind, bevor die weitere (schnelle) Abkühlung unmittelbar und ohne Haltezeit anschließt. Ausgehend von diesem geschilderten Stand der Technik mit den aufgezeigten verschiedenen Möglichkeiten der Herstellung von Dualphasengefüge ist es Aufgabe der Erfindung, ein Verfahren und eine Anlage anzugeben, mit der bzw. in der die Herstellung von Warmband mit Dualphasengefüge in einer konventionellen Gießwalzanlage mit den dort gegebenen örtlichen und damit auch zeitlichen Beschränkungen durchführbar ist. Die Kühlstrecke einer solchen Anlage ist dadurch gekennzeichnet, dass die Gesamtlänge in aller Regel 50 m nicht überschreitet und keine Kompaktkühlung vorgesehen ist.EP 1 108 072 B1 describes a process for the production of dual-phase steels, in which after the finish rolling with a two-stage cooling - first slowly, then quickly - a two-phase structure made of 70 to 90% ferrite and 30 to 10% martensite is achieved. The first (slow) cooling is carried out in a cooling section in which the hot strip is cooled in a defined manner by water cooling zones arranged one behind the other at a cooling rate of 20 - 30 K / s. The cooling is set so that the cooling curve enters the ferrite area at such a high temperature that the ferrite can form quickly. This first cooling is continued until at least 70% of the austenite has been converted into ferrite before the further (rapid) cooling follows immediately and without a holding time. Starting from this described prior art with the various possibilities of producing dual-phase structures shown, it is the object of the invention to provide a method and a system with or in which the production of hot strip with dual-phase structures in a conventional casting and rolling plant with the local conditions given there and thus time restrictions can also be implemented. The cooling section of such a system is characterized in that the total length generally does not exceed 50 m and no compact cooling is provided.
Diese Aufgabe wird verfahrensmäßig mit den kennzeichnenden Merkmalen des Anspruchs 1 dadurch gelöst, dass ausgehend von einem Stahl mit der chemischen Zusammensetzung: 0,01 - 0,08% C, 0,9 % Si, 0,5 - 1 ,6 % Mn, 1 ,2 % AI, 0,3 - 1 ,2 % Cr, Rest Fe sowie übliche Begleitelemente, zur Erzielung eines Warmbandes mit einem zweiphasigen Gefüge aus 70 bis 95 % Ferrit und 30 bis 5 % Martensit mit hoher mechanischer Festigkeit und hohem Umformvermögen (Zugfestigkeit größer 600 MPa, Bruchdehnung mindestens 25 %) in der Kühlstrecke einer Gießwalzanlage die zweistufige kontrollierte Kühlung von einer Endwalz-Bandtemperatur TfjnjSh mit A3- 100 K < TfjnjSh < A3- 50 K auf eine Haspel-Bandtemperatur TCOiiing < 300 0C (< Martensit-Starttemperatur) durchgeführt wird, wobei die Abkühlgeschwindigkeit Vi,2 in beiden Kühlstufen zwischen V = 30 - 150 K/s, vorzugsweise zwischen V = 50 - 90 K/s liegt, die erste Kühlstufe bis zum Eintritt der Kühlkurve in das Ferritgebiet durchgeführt wird und dann die durch Umwandlung des Austenits in Ferrit freigesetzte Umwandlungswärme zum isothermen Halten der erreichten Bandtemperatur mit einer Haltezeit 5 s bis zum Beginn der zweiten Kühlstufe genutzt wird.This object is achieved with the characterizing features of claim 1 in that, starting from a steel with the chemical composition: 0.01-0.08% C, 0.9% Si, 0.5-1.6% Mn, 1, 2% AI, 0.3 - 1, 2% Cr, rest Fe as well as usual accompanying elements, to achieve a hot strip with a two-phase structure made of 70 to 95% ferrite and 30 to 5% martensite with high mechanical strength and high formability ( Tensile strength greater than 600 MPa, elongation at break at least 25%) in the cooling section of a casting and rolling mill the two-stage controlled cooling from a final rolling strip temperature Tfj n j S h with A 3 - 100 K <Tfj n j S h <A 3 - 50 K on one reel -Band temperature T CO iiing <300 0 C (<martensite start temperature) is carried out, the cooling rate Vi, 2 in both cooling stages between V = 30 - 150 K / s, preferably between V = 50 - 90 K / s, first cooling stage until the cooling curve enters the ferrite area is then used and the conversion heat released by converting the austenite into ferrite isothermally used to maintain the strip temperature reached with a holding time of 5 s until the start of the second cooling stage.
Auf Grund der geringen Länge konventioneller Kühlstrecken in vorhandenen Gießwalzanlagen ist die Herstellung von Warmband mit Dualphasengefüge nur mit einer speziellen Kühlstrategie möglich. Damit eine derartige Kühlstrategie auch durchführbar ist, ist die Einhaltung von bestimmten Grenzwerten der chemischen Zusammensetzung, wie im Anspruch 1 aufgelistet, zwingend erforder- lieh, um innerhalb der zur Verfügung stehenden kurzen Kühlgesamtzeit den gewünschten Umwandlungsgrad zu erreichen.Due to the short length of conventional cooling sections in existing casting and rolling plants, the production of hot strip with dual-phase structure is only possible with a special cooling strategy. So that such a cooling strategy can also be carried out, compliance with certain limit values of the chemical composition, as listed in claim 1, is imperative. lent to achieve the desired degree of conversion within the short total cooling time available.
Die Kühlstrategie sieht dabei eine zweistufige Kühlung mit wahlweise unterschiedlichen Abkühlgeschwindigkeiten vor, die durch eine isothermische Haltezeit von maximal 5 Sekunden unterbrochen wird. Der Beginn der Haltezeit, dies entspricht dem Ende der ersten Kühlstufe, wird bestimmt durch den Eintritt der Kühlkurve in das Ferritgebiet bzw. dem Beginn der Austenitumwandlung in Ferrit. In der kurzen isothermischen Kühlpause von maximal 5 Sekunden, während der erfindungsgemäß die freigesetzte Umwandlungswärme zum Halten der Temperatur auf einen konstanten Wert genutzt und dabei eine unvermeidliche Luftabkühlung kompensiert wird, erfolgt der gesamte angestrebte Umsatz des Austenits zu mindestens 70 % Ferrit. Anschließend an diese Haltezeit folgt dann unmittelbar die zweite Kühlstufe mit einer Abkühlung des Warmbandes auf eine Temperatur unterhalb von 300 0C. Da diese Temperatur unterhalb der Martensit-Starttemperatur liegt, wird bei dieser Kühlung dann mit Martensit der zweite Gefügebestandteil in gewünschter Höhe erhalten.The cooling strategy provides for two-stage cooling with optionally different cooling speeds, which is interrupted by an isothermal holding time of a maximum of 5 seconds. The start of the holding time, which corresponds to the end of the first cooling stage, is determined by the entry of the cooling curve into the ferrite area or the start of the austenite transformation into ferrite. In the short isothermal cooling pause of a maximum of 5 seconds, during which the conversion heat released according to the invention is used to keep the temperature at a constant value and an inevitable cooling of the air is compensated for, the total targeted conversion of the austenite to at least 70% ferrite takes place. Subsequently, the second cooling stage is followed in this holding period immediately by a cooling of the hot strip to a temperature below 300 0 C. Since this temperature is below the martensite start temperature is then held at this cooling with martensite, the second structure component at the desired height.
Neben der Durchführung einer kurzen Haltezeit wird die Kühlstrategie durch eine genau definierte vorgegebene Abkühlgeschwindigkeit für beide Abkühlstufen bestimmt. Diese Abkühlgeschwindigkeit liegt zwischen V = 30 - 150 K/s, vorzugsweise zwischen V = 50 - 90 K/s, abhängig von der Warmbandgeometrie sowie der chemischen Zusammensetzung der eingesetzten Stahlsorte. Zu diesen Abkühlgeschwindigkeiten ist zu bemerken, dass eine Abkühlgeschwindigkeit kleiner 30 K/s wegen der geringen zur Verfügung stehenden Zeit in der konventionellen Kühlstrecke einer Gießwalzanlage nicht möglich ist, während Abkühlgeschwindigkeiten größer 150 K/s in derartigen Kühlstrecken ebenfalls nicht zu erreichen sind.In addition to carrying out a short holding time, the cooling strategy is determined by a precisely defined, predetermined cooling rate for both cooling stages. This cooling rate is between V = 30 - 150 K / s, preferably between V = 50 - 90 K / s, depending on the hot strip geometry and the chemical composition of the type of steel used. Regarding these cooling speeds, it should be noted that a cooling speed of less than 30 K / s is not possible because of the short time available in the conventional cooling section of a casting and rolling mill, while cooling speeds greater than 150 K / s cannot be achieved in such cooling sections either.
Im Vergleich zur Herstellung von Dualphasen-Warmband nach dem Stand der Technik zeichnet sich das erfindungsgemäße Verfahren neben einer abwei- chenden chemischen Zusammensetzung des Ausgangsstahls dadurch aus, dass a) die Endwalztemperatur deutlich unterhalb der A3 -Temperatur liegt, b) in der zweiten Kühlstufe bis zu einer Temperatur unterhalb von 300 0C gekühlt wird, c) die Abkühlgeschwindigkeiten unterhalb von 150 K/s und oberhalb von 30 K/s liegen, d) zwischen den beiden Kühlstufen eine mit maximal 5 Sekunden sehr kurze Haltezeit liegt, in der keine Kühlung erfolgt, e) die Umwandlung zu Ferrit isotherm erfolgt.In comparison to the production of dual-phase hot strip according to the prior art, the method according to the invention is distinguished not only by a different is sponding chemical composition of the base steel is characterized in that a) the final rolling temperature is well below the A 3 temperature, b) in the second cooling stage to a temperature below 300 0 C cooled, c) the cooling rate below 150 K / s and are above 30 K / s, d) between the two cooling stages there is a very short holding time with a maximum of 5 seconds during which no cooling takes place, e) the conversion to ferrite is isothermal.
Eine Anlage zur Durchführung des Verfahrens der Erfindung ist gekennzeichnet durch eine hinter dem letzten Fertigwalzgerüst angeordnete konventionelle Kühlstrecke einer Gießwalzanlage, die mehrere mit Abstand hintereinander angeordnete regelbare Wasserkühlgruppen mit Wasserkühlbalken aufweist. Die in jeder Kühlgruppe vorhandenen Kühlbalken sind so angeordnet, dass die Bandoberseite und die Bandunterseite des Warmbandes gleichmäßig mit einer bestimmten Wassermenge beaufschlagt werden. Die Gesamtwassermenge ist regelbar, indem einzelne Kühlbalken während des Walzens zu- oder abgeschaltet werden. Die Anzahl und Anordnung der zugeschalteten Wasserkühlbalken kann variabel vorab eingestellt werden, um die gesamte Kühlstrecke optimal an die einzustellenden Abkühlbedingungen anzupassenA plant for carrying out the method of the invention is characterized by a conventional cooling section of a casting and rolling plant, which is arranged behind the last finishing roll stand and has a plurality of controllable water cooling groups with water cooling bars arranged at a distance from one another. The cooling beams in each cooling group are arranged in such a way that a certain amount of water is applied uniformly to the top and bottom of the hot strip. The total amount of water can be regulated by switching individual cooling beams on or off during the rolling process. The number and arrangement of the connected water cooling beams can be variably set in advance in order to optimally adapt the entire cooling section to the cooling conditions to be set
Weitere Einzelheiten, Merkmale und Eigenschaften der Erfindung werden nachfolgend an einem in schematischen Zeichnungsfiguren dargestellten Ausführungsbeispiel näher erläutert.Further details, features and properties of the invention are explained in more detail below using an exemplary embodiment shown in schematic drawing figures.
Es zeigen:Show it:
Fig. 1 eine Zeit-Temperatur-Abkühlkurve eines Warmbandes, Fig. 2 ein Layout einer Kühlstrecke in einer Gießwalzanlage mit 6- gerüstiger Fertigstraße, Fig. 3 ein Layout einer Kühlstrecke in einer Gießwalzanlage mit 7- gerüstiger Fertigstraße.1 is a time-temperature cooling curve of a hot strip, 2 shows a layout of a cooling section in a casting and rolling plant with a 6-stand finishing train, FIG. 3 shows a layout of a cooling section in a casting and rolling plant with a 7-stand finishing train.
In Figur 1 ist eine Abkühlkurve mit dem Zeit-Temperaturverlauf eines Warmbandes beispielhaft dargestellt, das nach dem erfindungsgemäßen Verfahren auf dem Auslaufrollgang in einer Kühlstrecke 1 gekühlt wurde. Das Warmband mit der Zusammensetzung: 0,06 % C, 0,1 % Si, 1 ,2 % Mn, 0,015 % P, 0,06 % S, 00,036 % AI, 0,15 % Cu, 0,054 % Ni1 0,71 % Cr1 Rest Fe sowie übliche Begleitelemente wurde von einer eingestellten Endwalztemperatur Tflnish von 800 0C in einer ersten Kühlstufe mit einer Abkühlgeschwindigkeit Vi von 54 K/s auf eine Temperatur des Warmbandes von 670 0C abgekühlt, bei der die Kühlkurve in das Ferritgebiet eintrat. Während einer Haltezeit von etwa 4 Sekunden blieb die Warmbandtemperatur bei dieser Haltetemperatur Tconst., bevor in einer zweiten Kühlstufe mit einer Abkühlgeschwindigkeit V2 von 84 K/s auf eine Bandtemperatur unterhalb von 300 0C (ca. 250 0C Haspeltemperatur) fertig gekühlt wurde. An dem nach diesem Verfahren hergestellten Warmband mit einem Dualphasengefüge im angestrebten Bereich von mindestens 70 % Ferrit und weniger als 20 % Martensit wurde in Versuchen eine Zugfestigkeit von 620 MPa in Kombination mit einem Streckgrenzenverhältnis von 0,52 ermittelt.FIG. 1 shows an example of a cooling curve with the time-temperature profile of a hot strip which was cooled in a cooling section 1 on the outlet roller table by the method according to the invention. The hot-rolled strip having the composition: 0.06% C, 0.1% Si, 1, 2% Mn, 0.015% P, 0.06% S, 00.036% Al, 0.15% Cu, 0.054% Ni 1 0, 71% Cr 1 rest Fe and usual accompanying elements were cooled from a set final rolling temperature T fl ni s h of 800 0 C in a first cooling stage with a cooling rate Vi of 54 K / s to a temperature of the hot strip of 670 0 C, at which the Cooling curve entered the ferrite area. While a hold time of about 4 seconds, the hot strip temperature in this holding temperature T con remained st., Before finishing set in a second cooling stage at a cooling rate V 2 of 84 K / to a strip temperature below 300 0 C (250 0 C coiling temperature) was cooled. A tensile strength of 620 MPa in combination with a yield point ratio of 0.52 was determined in experiments on the hot strip produced by this process with a dual-phase structure in the desired range of at least 70% ferrite and less than 20% martensite.
In Figur 2 ist beispielhaft das Layout einer erfindungsgemäß ausgebildeten Kühlstrecke 1 einer konventionellen Gießwalzanlage dargestellt. Die vom Warmband 10 in Transportrichtung 8 durchlaufene Kühlstrecke 1 befindet sich zwischen dem letzten Fertiggerüst 2 und dem Haspel 5. Zwischen dem letzten Fertiggerüst 2 und der ersten Wasserkühlgruppe 3i befindet sich eine Temperaturmessstelle 6 zur Kontrolle der Temperatur des in die Kühlstrecke 1 einlaufenden Warmbandes 10. Die Kühlstrecke 1 besteht gemäß Fig. 2 aus insgesamt acht Kühlgruppen 3-|.7 und 4, wobei die letzte häufig als Trimmzone 4 ausgeführt ist. Allgemeiner - abhängig von der jeweiligen Gießwalzanlage - gehö- ren zwischen sechs und neun Kühlgruppen zu einer konventionellen Kühlstrek- ke.FIG. 2 shows an example of the layout of a cooling section 1 of a conventional casting and rolling system designed according to the invention. The cooling section 1 traversed by the hot strip 10 in the transport direction 8 is located between the last finishing stand 2 and the reel 5. Between the last finishing stand 2 and the first water cooling group 3i there is a temperature measuring point 6 for checking the temperature of the hot strip 10 entering the cooling section 1. 2 consists of a total of eight cooling groups 3- |. 7 and 4, the last being often designed as trim zone 4. More generally - depending on the respective casting and rolling system - between six and nine cooling groups to form a conventional cooling section.
Im dargestellten Beispiel der Fig. 2 handelt es sich um das typische Layout einer Kühlstrecke für eine 6-gerüstige Gießwalzanlage, was an der Lücke zwischen den Kühlgruppen 37 und 4 zu erkennen ist. Der spätere Ausbau auf eine 7-gerüstige Fertigstraße bedingt häufig, dass beispielsweise die erste Kühlgruppe (Kühlzone) 3i nach hinten in die bauliche Lücke zwischen den Kühlgruppen 37 und 4 versetzt werden muss. In diesem Fall ergibt sich ein Layout einer Kühlstrecke 1' gemäß Figur 3, die sich lediglich durch den Wegfall dieser baulichen Lücke zwischen den Kühlgruppen 37 und 4 vom Layout der Kühlstrecke 1 der Fig. 2 unterscheidet. Die Bezugszeichen der einzelnen Konstruktionsteile und Baugruppen der Fig. 3 entsprechen deshalb den entsprechenden Bezugszeichen der Fig. 2. Eine Ausnahme bildet die erste Kühlgruppe 3i', deren oberer Kühlbalken im Gegensatz zum Kühlbalken der Kühlgruppe 3i der Fig. 2 in üblicher Länge der Kühlgruppen 32 bis 37 ausgebildet ist.The example shown in FIG. 2 is the typical layout of a cooling section for a 6-stand casting and rolling system, which can be seen from the gap between the cooling groups 3 7 and 4. The subsequent expansion to a 7-stand finishing train often means that, for example, the first cooling group (cooling zone) 3i has to be moved backwards into the structural gap between cooling groups 3 7 and 4. In this case, there is a layout of a cooling section 1 'according to FIG. 3, which differs from the layout of the cooling section 1 of FIG. 2 only in that this structural gap between the cooling groups 3 7 and 4 is eliminated. 3 therefore correspond to the corresponding reference numerals in FIG. 2. An exception is the first cooling group 3i ', whose upper cooling bar, in contrast to the cooling bar of cooling group 3i in FIG. 2, has the usual length of cooling groups 3 2 to 3 7 is formed.
In aller Regel weist jede Kühlgruppe jeweils vier Kühlbalken sowohl auf der Ober- als auch auf der Unterseite auf. Jeder Kühlbalken wiederum besteht aus zwei Reihen an Wasserröhrchen zur Kühlung von Bandoberseite 10' und Bandunterseite 10". Als Besonderheit ist die in Figur 2 dargestellte Kühlgruppe 3i aus Platzgründen auf der Oberseite um einen Kühlbalken gekürzt.As a rule, each cooling group has four chilled beams on both the top and bottom. Each chilled beam in turn consists of two rows of water tubes for cooling the upper side 10 'and the lower side 10 "of the belt. As a special feature, the cooling group 3i shown in FIG. 2 is shortened by one chilled beam on the upper side for reasons of space.
Im Unterschied zu den vorderen Kühlgruppen 3i-7, welche pro Kühlbalken ein schaltbares Ventil 7 besitzen, weist die Trimmzone 4 für jeden Balken zwei Ventile 7 auf. Dies bedeutet, dass in der Trimmzone jede Reihe an Kühlröhr- chen einzeln angesteuert werden kann und sich somit die Wassermenge feiner regeln lässt.In contrast to the front cooling groups 3 - 7 , which have a switchable valve 7 for each cooling beam, the trimming zone 4 has two valves 7 for each beam. This means that each row of cooling tubes can be controlled individually in the trim zone and the water volume can thus be regulated more precisely.
Je nach gewalzter Fertigbanddicke ändert sich die Auslaufgeschwindigkeit des Bandes aus der Fertigstraße und dementsprechend muss die Fahrweise der Kühlstrecke angepasst werden, um die zur Einstellung der Bandeigenschaften erforderliche Zeit-Temperaturführung einstellen zu können. Für eine Banddicke von beispielsweise 3 mm wird die erste notwendige Kühlstufe mit den Kühlgruppen 3i und 32 erreicht, während die zweite Kühlstufe mit den Gruppen 3s, 36, 37 und 4 realisiert wird. Bei einem 2.0 mm Fertigband werden aufgrund der geänderten Randbedingungen nur noch die Kühlgruppen 36, 37 und 4 für die zweite Kühlstufe eingesetzt. Depending on the thickness of the finished strip rolled, the speed of the strip running out of the finishing train changes and the driving style of the cooling section must be adjusted accordingly in order to adjust the strip properties to be able to set the required time-temperature control. For a strip thickness of 3 mm, for example, the first necessary cooling stage is achieved with the cooling groups 3i and 3 2 , while the second cooling stage is realized with the groups 3s, 3 6 , 3 7 and 4. In the case of a 2.0 mm finished strip, only the cooling groups 36, 3 7 and 4 are used for the second cooling stage due to the changed boundary conditions.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Kühlstrecke1 cooling section
2 letztes Fertiggerüst2 last finishing stand
3i-7 Wasserkühlgruppen3i-7 water cooling groups
4 Wasserkühlgruppe (Trimmzone)4 water cooling group (trim zone)
5 Haspel5 reels
6 Temperaturmessstelle6 temperature measuring point
7 schaltbares Ventil7 switchable valve
8 Transportrichtung8 Transport direction
10 Warmband10 hot strip
10' Bandoberseite10 'band top
10" Bandunterseite10 "tape underside
Vi Abkühlgeschwindigkeit der ersten KühlstufeVi cooling rate of the first cooling stage
V2 Abkühlgeschwindigkeit der zweiten KühlstufeV 2 cooling rate of the second cooling stage
I finish Bandtemperatur nach dem letzten FertiggerüstI finish belt temperature after the last finishing stand
I const. Bandtemperatur nach der HaltezeitI const. Belt temperature after the holding time
' coiling Bandtemperatur nach Ende der Kühlung (Coiltemperatur) '' coil temperature after cooling (coil temperature)

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von Warmband (10) mit einem Dualphasengefüge aus Ferrit und Martensit, wobei mindestens 70 % des Austenits in Ferrit umgewandelt sind, aus dem warmgewalzten Zustand durch eine kontrollierte zweistufige Abkühlung nach dem Fertigwalzen auf eine Bandtemperatur unterhalb der Martensit-Starttemperatur in einer Kühlstrecke (1 , 1') aus mit Abstand hintereinander angeordneten Wasserkühlgruppen (3i-7, 4), dadurch gekennzeichnet, dass ausgehend von einem Stahl mit der chemischen Zusammensetzung: 0,01 - 0,08% C, 0,9 % Si, 0,5 - 1 ,6 % Mn, 1 ,2 % AI, 0,3 - 1 ,2 % Cr, Rest Fe sowie übliche Begleitelemente, zur Erzielung eines Warmbandes (10) mit einem zweiphasigen Gefüges aus 70 bis 95 % Ferrit und 30 bis 5 % Martensit mit hoher mechanischer Festigkeit und hohem Umformvermögen (Zugfestigkeit größer 600 MPa, Bruchdehnung mindestens 25 %) in der Kühlstrecke einer Gießwalzanlage: a) die zweistufige kontrollierte Kühlung von einer Endwalz-Bandtemperatur Tfinish mit A3- 100 K < TfjnjSh < A3 - 50 K auf eine Haspel-Bandtemperatur Tcoiiing < 300 0C (< Martensit-Starttemperatur) durchgeführt wird, wobei die Abkühlgeschwindigkeit Vi,2 in beiden Kühlstufen zwischen V = 30 - 150 K/s, vorzugsweise zwischen V = 50 - 90 K/s liegt, b) die erste Kühlstufe bis zum Eintritt der Kühlkurve in das Ferritgebiet durchgeführt wird und dann die durch Umwandlung des Austenits in Ferrit freigesetzte Umwandlungswärme zum isothermen Halten der erreichten Bandtemperatur TCOnst. mit einer Haltezeit 5 s bis zum Beginn der zweiten Kühlstufe genutzt wird.1. A method for producing hot strip (10) with a dual-phase structure of ferrite and martensite, wherein at least 70% of the austenite is converted into ferrite, from the hot-rolled state by controlled two-stage cooling after the finish rolling to a strip temperature below the martensite start temperature in a cooling section (1, 1 ') of water cooling groups (3i-7, 4) arranged at a distance from one another, characterized in that, starting from a steel with the chemical composition: 0.01-0.08% C, 0.9% Si , 0.5 - 1, 6% Mn, 1, 2% Al, 0.3 - 1, 2% Cr, rest Fe as well as usual accompanying elements, to achieve a hot strip (10) with a two-phase structure made of 70 to 95% ferrite and 30 to 5% martensite with high mechanical strength and high formability (tensile strength greater than 600 MPa, elongation at break at least 25%) in the cooling section of a casting and rolling plant: a) the two-stage controlled cooling from a final rolling strip temperature T f ini sh with A 3 - 100 K <T f j n j Sh <A 3 - 50 K to a coiler strip temperature T c oiiing <300 0 C (<martensite start temperature), the cooling rate Vi, 2 in both cooling stages between V = 30 - 150 K / s, preferably between V = 50 - 90 K / s, b) the first cooling stage is carried out until the cooling curve enters the ferrite region and then the conversion heat released by converting the austenite into ferrite to the isothermal Maintaining the reached strip temperature T CO nst. with a holding time of 5 s until the start of the second cooling stage.
2. Gießwalzanlage zur Herstellung von Warmband (10) mit Dualphasengefüge aus dem warmgewalzten Zustand mit einer hinter dem letzten Fertigwalzge- rüst (2) angeordneten Kühlstrecke (1 , 1') mit mehreren mit Abstand hintereinander angeordneten Wasserkühlgruppen (3i-7, 4), zur Durchführung des Verfahrens nach Anspruch 1 , dadurch gekennzeichnet, dass die Kühlstrecke (1 , 1') eine für konventionelle Gießwalzanlagen übliche Länge (< 50 m) aufweist, innerhalb der eine entsprechende Anzahl von regelbaren Wasserkühlgruppen (3i-7, 4) so angeordnet sind, dass durch eine angepasste Fahrweise der gesamten Kühlstrecke in Abhängigkeit von der Banddicke und der Bandgeschwindigkeit die benötigte Abkühlgeschwindigkeit (Vi ,2) jeder Kühlstufe eingestellt sowie die benötigte Haltezeit bei der Bandtemperatur TCOnst zwischen den beiden Kühlstufen realisiert werden kann.2. Casting-rolling plant for the production of hot strip (10) with dual-phase structure from the hot-rolled state with one behind the last finish-rolling Equipped (2) arranged cooling section (1, 1 ') with a plurality of water cooling groups (3i- 7 , 4) arranged one behind the other for carrying out the method according to claim 1, characterized in that the cooling section (1, 1') one for conventional Casting-rolling systems have the usual length (<50 m), within which a corresponding number of controllable water cooling groups (3 - 7 , 4) are arranged so that the required cooling speed (Vi , 2 ) each cooling level can be set and the required holding time at the strip temperature T CO n st can be realized between the two cooling levels.
3. Gießwalzanlage nach Anspruch 2, dadurch gekennzeichnet, dass jede Wasserkühlgruppe (3i_7, 4) mehrere über schaltbare Ventile (7) regelbare Kühlbalken enthält, die so angeordnet sind, dass die Bandoberseite (10') und die Bandunterseite (10") des durchlaufenden Warmbandes (10) gleichmäßig mit einer bestimmten Wassermenge beaufschlagt werden, wobei die Wassermengen für die Bandoberseite (10') und die Bandunterseite (10") auch gegeneinander vertrimmbar sind.3. casting and rolling plant according to claim 2, characterized in that each water cooling group (3i_ 7 , 4) contains a plurality of switchable valves (7) controllable chilled beams, which are arranged so that the strip top (10 ') and the strip underside (10 ") of continuous hot strip (10) are uniformly acted upon with a certain amount of water, the amounts of water for the upper side of the strip (10 ') and the lower side (10 ") of the strip also being mutually trimmable.
4. Gießwalzanlage nach Anspruch 3, dadurch gekennzeichnet, dass die letzte Wasserkühlgruppe (4) zur Kühlung der Bandoberseite (10') und der Bandunterseite (10") jeweils acht schaltbare Ventile (7) für vier Kühlbalken oben und unten zur genaueren Einstellung der Wassermenge aufweist. 4. casting and rolling plant according to claim 3, characterized in that the last water cooling group (4) for cooling the strip top (10 ') and the strip underside (10 ") each have eight switchable valves (7) for four chilled beams above and below for more precise adjustment of the amount of water having.
EP04739698.1A 2003-06-18 2004-06-08 Method and installation for the production of hot-rolled strip having a dual-phase structure Revoked EP1633894B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10327383A DE10327383C5 (en) 2003-06-18 2003-06-18 Plant for the production of hot strip with dual phase structure
PCT/EP2004/006170 WO2004111279A2 (en) 2003-06-18 2004-06-08 Method and installation for the production of hot-rolled strip having a dual-phase structure

Publications (2)

Publication Number Publication Date
EP1633894A2 true EP1633894A2 (en) 2006-03-15
EP1633894B1 EP1633894B1 (en) 2017-04-26

Family

ID=33546580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04739698.1A Revoked EP1633894B1 (en) 2003-06-18 2004-06-08 Method and installation for the production of hot-rolled strip having a dual-phase structure

Country Status (14)

Country Link
US (1) US20070175548A1 (en)
EP (1) EP1633894B1 (en)
JP (1) JP5186636B2 (en)
KR (1) KR20060057538A (en)
CN (1) CN100381588C (en)
CA (1) CA2529837C (en)
DE (1) DE10327383C5 (en)
EG (1) EG23893A (en)
MY (1) MY136875A (en)
RU (1) RU2346061C2 (en)
TW (1) TWI300443B (en)
UA (1) UA81329C2 (en)
WO (1) WO2004111279A2 (en)
ZA (1) ZA200509876B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100447260C (en) * 2006-06-23 2008-12-31 宝山钢铁股份有限公司 Quick cooling test plant for disk type band steel, and method of use
EP2361699A1 (en) * 2010-02-26 2011-08-31 Siemens Aktiengesellschaft Method for cooling sheet metal with a cooling section, cooling section and control and/or regulating device for a cooling section
DE102011000089A1 (en) * 2011-01-11 2012-07-12 Thyssenkrupp Steel Europe Ag Method for producing a hot rolled flat steel product
CN103215420B (en) * 2012-12-31 2015-02-04 西安石油大学 Obtaining method of large deformation pipe line steel double phase structure
CN104043660B (en) * 2013-09-26 2015-09-30 北大方正集团有限公司 A kind of production technology of non-hardened and tempered steel
DE102017206540A1 (en) 2017-04-18 2018-10-18 Sms Group Gmbh Apparatus and method for cooling metal strips or sheets
DE102017127470A1 (en) * 2017-11-21 2019-05-23 Sms Group Gmbh Chilled beams and cooling process with variable cooling rate for steel sheets
DE102017220891A1 (en) * 2017-11-22 2019-05-23 Sms Group Gmbh Method for cooling a metallic material and cooling beam
CN109576581A (en) 2018-11-30 2019-04-05 宝山钢铁股份有限公司 A kind of great surface quality, low yield strength ratio hot-rolled high-strength steel plate and manufacturing method
CN110724801B (en) * 2019-10-28 2021-02-12 重庆科技学院 Method for improving strength and toughness of Cr-Mo ultrahigh-strength steel by direct cryogenic treatment after austenite and ferrite two-phase region isothermal heat treatment
RU2724217C1 (en) * 2020-02-04 2020-06-22 Антон Владимирович Шмаков Method of producing rolled steel

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533261A (en) * 1967-06-15 1970-10-13 Frans Hollander Method and a device for cooling hot-rolled metal strip on a run-out table after being rolled
FR223577A (en) * 1973-12-11
US4159218A (en) * 1978-08-07 1979-06-26 National Steel Corporation Method for producing a dual-phase ferrite-martensite steel strip
SE430902B (en) * 1979-05-09 1983-12-19 Svenskt Stal Ab SET TO HEAT TREAT A STALBAND WITH 0.05 - 0.20% CARBON CONTENT AND LOW CONTENTS
JPS57137426A (en) * 1981-02-20 1982-08-25 Kawasaki Steel Corp Production of low yield ratio, high tensile hot rolled steel plate by mixed structure
JPS57137452A (en) * 1981-02-20 1982-08-25 Kawasaki Steel Corp Hot rolled high tensile steel plate having composite structure and its manufacture
DE3440752A1 (en) * 1984-11-08 1986-05-22 Thyssen Stahl AG, 4100 Duisburg METHOD FOR PRODUCING HOT TAPE WITH A TWO-PHASE TEXTURE
JPS63207410A (en) 1987-02-24 1988-08-26 Kawasaki Steel Corp Method for preventing variation of sheet width of hot rolled steel strip
JPH0763749B2 (en) 1988-11-15 1995-07-12 日本鋼管株式会社 Cooling method after hot rolling
JPH0390206A (en) * 1989-08-31 1991-04-16 Kobe Steel Ltd Control method for cooling of hot rolled steel plate
JPH04167916A (en) 1990-10-30 1992-06-16 Sumitomo Metal Ind Ltd Device for controlling pressure of feeding water for spraying
JPH06190419A (en) 1992-12-24 1994-07-12 Kawasaki Steel Corp Method for cooling strip
JPH06238312A (en) * 1993-02-18 1994-08-30 Sumitomo Metal Ind Ltd Method for controlling cooling of hot rolled steel sheet
DE19513999C2 (en) 1995-04-13 1999-07-29 Sundwig Gmbh Production line and its use for the production of steel strip
FR2735148B1 (en) * 1995-06-08 1997-07-11 Lorraine Laminage HIGH-STRENGTH, HIGH-STRENGTH HOT-ROLLED STEEL SHEET CONTAINING NIOBIUM, AND METHODS OF MAKING SAME.
EP0750049A1 (en) * 1995-06-16 1996-12-27 Thyssen Stahl Aktiengesellschaft Ferritic steel and its manufacture and use
CN1161378A (en) * 1996-01-16 1997-10-08 艾利格汉尼·勒德鲁姆公司 Process for producing dual phase ferritic stainless steel strip
EP0969112B2 (en) * 1997-03-17 2017-03-08 Nippon Steel & Sumitomo Metal Corporation A method of producing dual-phase high-strength steel sheets having high impact energy absorption properties
DE19833321A1 (en) * 1998-07-24 2000-01-27 Schloemann Siemag Ag Method and installation to produce dual phase steels out of hot-rolled strip, with cooling rate at first cooling stage set sufficiently low to obtain temperature which is sufficiently high for rapid transformation of austenite into ferrite
DE19963186B4 (en) 1999-12-27 2005-04-14 Siemens Ag Method for controlling and / or regulating the cooling section of a hot strip mill for rolling metal strip and associated device
DE10129565C5 (en) 2001-06-20 2007-12-27 Siemens Ag Cooling method for a hot-rolled rolling stock and corresponding cooling line model
US20080178972A1 (en) 2006-10-18 2008-07-31 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd) High strength steel sheet and method for producing the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004111279A2 *

Also Published As

Publication number Publication date
CN100381588C (en) 2008-04-16
MY136875A (en) 2008-11-28
KR20060057538A (en) 2006-05-26
CA2529837C (en) 2012-08-21
EP1633894B1 (en) 2017-04-26
WO2004111279A3 (en) 2005-05-06
CA2529837A1 (en) 2004-12-23
JP5186636B2 (en) 2013-04-17
ZA200509876B (en) 2006-11-29
CN1820086A (en) 2006-08-16
EG23893A (en) 2007-12-13
RU2006101338A (en) 2006-06-10
DE10327383B4 (en) 2010-10-14
UA81329C2 (en) 2007-12-25
TWI300443B (en) 2008-09-01
WO2004111279A2 (en) 2004-12-23
DE10327383C5 (en) 2013-10-17
DE10327383A1 (en) 2005-02-10
RU2346061C2 (en) 2009-02-10
TW200502405A (en) 2005-01-16
US20070175548A1 (en) 2007-08-02
JP2006527790A (en) 2006-12-07

Similar Documents

Publication Publication Date Title
EP0885974B1 (en) Process for rolling wide hot strip in a compact strip production line
DE19911287C1 (en) Process for producing a hot strip
EP1305122B1 (en) Production method and installation for producing thin flat products
DE102005051052A1 (en) Process for the production of hot strip with multiphase structure
AT504782A4 (en) METHOD FOR PRODUCING A HOT-ROLLED STEEL STRIP AND COMBINED CASTING AND ROLLING MACHINE TO PERFORM THE METHOD
EP2507399B1 (en) Hot rolling mill and method for hot rolling a metal strip or sheet
WO2000021695A1 (en) Method and device for producing a metal strip for tailored blanks to be cut to length
EP1633894B1 (en) Method and installation for the production of hot-rolled strip having a dual-phase structure
DE19600990C2 (en) Process for hot rolling steel strips
EP1319725B1 (en) Hot strip manufacturing process
DE10315419B3 (en) Production of screw springs or stabilizers made from steel comprises comparing the heating temperature over the rod lengths and maintaining between the rollers
DE2900271A1 (en) WELDABLE CONCRETE STEEL AND METHOD FOR THE PRODUCTION THEREOF
WO2008006346A2 (en) Method for production of a sheet metal semi-finished product suitable for press hardening
DE3033501A1 (en) METHOD FOR THE DIRECT HEAT TREATMENT OF RODWIRE FROM AUSTENITIC, STAINLESS STEEL
EP1038978B1 (en) Process for manufacturing hot strip
AT525283B1 (en) Method for producing a dual-phase steel strip in a combined casting and rolling plant, a dual-phase steel strip produced using the method and a combined casting and rolling facility
WO2023016965A1 (en) Method and device for producing high-strength and very high-strength multiphase steel
EP0185341B1 (en) Method of increasing the strength of reinforcing steels
WO2000036162A1 (en) Method for producing thin hot-rolled steel strips with improved deep-drawing qualities

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20051124

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
RIN1 Information on inventor provided before grant (corrected)

Inventor name: HENNIG, WOLFGANG

Inventor name: BOECHER, TILLMANN

Inventor name: HENSGER, KARL-ERNST

Inventor name: BILGEN, CHRISTIAN

17Q First examination report despatched

Effective date: 20070425

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ACERIA COMPACTA DE BIZKAIA S.A.

Owner name: SMS SIEMAG AG

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SMS GROUP GMBH

Owner name: ACERIA COMPACTA DE BIZKAIA S.A.

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 11/00 20060101ALI20160830BHEP

Ipc: C21D 1/19 20060101ALI20160830BHEP

Ipc: C21D 8/02 20060101AFI20160830BHEP

Ipc: C21D 1/02 20060101ALI20160830BHEP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 502004015516

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: C21D0008020000

Ipc: B22D0011000000

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 8/02 20060101ALI20161102BHEP

Ipc: C21D 11/00 20060101ALI20161102BHEP

Ipc: C22C 38/02 20060101ALI20161102BHEP

Ipc: C21D 1/19 20060101ALI20161102BHEP

Ipc: B22D 11/12 20060101ALI20161102BHEP

Ipc: C22C 38/18 20060101ALI20161102BHEP

Ipc: C21D 1/02 20060101ALI20161102BHEP

Ipc: C22C 38/42 20060101ALI20161102BHEP

Ipc: C22C 38/06 20060101ALI20161102BHEP

Ipc: B21B 1/46 20060101AFI20161102BHEP

Ipc: C22C 38/04 20060101ALI20161102BHEP

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 1/19 20060101ALI20161116BHEP

Ipc: C22C 38/42 20060101ALI20161116BHEP

Ipc: C21D 1/02 20060101ALI20161116BHEP

Ipc: B22D 11/12 20060101ALI20161116BHEP

Ipc: C21D 8/02 20060101ALI20161116BHEP

Ipc: B21B 1/46 20060101ALI20161116BHEP

Ipc: C22C 38/02 20060101ALI20161116BHEP

Ipc: C22C 38/06 20060101ALI20161116BHEP

Ipc: C22C 38/04 20060101ALI20161116BHEP

Ipc: C21D 11/00 20060101AFI20161116BHEP

RIC1 Information provided on ipc code assigned before grant

Ipc: B22D 11/00 20060101AFI20161118BHEP

INTG Intention to grant announced

Effective date: 20161205

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 887426

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170515

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502004015516

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170727

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

REG Reference to a national code

Ref country code: DE

Ref legal event code: R026

Ref document number: 502004015516

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLAX Notice of opposition and request to file observation + time limit sent

Free format text: ORIGINAL CODE: EPIDOSNOBS2

26 Opposition filed

Opponent name: PRIMETALS TECHNOLOGIES AUSTRIA GMBH/PRIMETALS TECH

Effective date: 20180125

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170630

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170608

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170630

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170608

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170630

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20170630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20040608

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170426

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

APBM Appeal reference recorded

Free format text: ORIGINAL CODE: EPIDOSNREFNO

APBP Date of receipt of notice of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA2O

APBQ Date of receipt of statement of grounds of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA3O

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170426

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20200618

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20200625

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20200619

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20200625

Year of fee payment: 17

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502004015516

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 887426

Country of ref document: AT

Kind code of ref document: T

Effective date: 20210608

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20210608

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210608

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220101

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210608

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210608

APBU Appeal procedure closed

Free format text: ORIGINAL CODE: EPIDOSNNOA9O

RDAF Communication despatched that patent is revoked

Free format text: ORIGINAL CODE: EPIDOSNREV1

REG Reference to a national code

Ref country code: DE

Ref legal event code: R103

Ref document number: 502004015516

Country of ref document: DE

Ref country code: DE

Ref legal event code: R064

Ref document number: 502004015516

Country of ref document: DE

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 20231104

REG Reference to a national code

Ref country code: AT

Ref legal event code: MA03

Ref document number: 887426

Country of ref document: AT

Kind code of ref document: T

Effective date: 20231104