EP0264459A1 - Production of hot-rolled steel strip from continuously cast slabs - Google Patents

Production of hot-rolled steel strip from continuously cast slabs Download PDF

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Publication number
EP0264459A1
EP0264459A1 EP86114160A EP86114160A EP0264459A1 EP 0264459 A1 EP0264459 A1 EP 0264459A1 EP 86114160 A EP86114160 A EP 86114160A EP 86114160 A EP86114160 A EP 86114160A EP 0264459 A1 EP0264459 A1 EP 0264459A1
Authority
EP
European Patent Office
Prior art keywords
cast strand
rolling
furnace
storage
minutes
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
EP86114160A
Other languages
German (de)
French (fr)
Other versions
EP0264459B1 (en
Inventor
Wolfgang Dr. Rohde
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
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag AG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8195492&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0264459(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to ES86114160T priority Critical patent/ES2010653B3/en
Priority to DE8686114160T priority patent/DE3665680D1/en
Priority to EP86114160A priority patent/EP0264459B1/en
Priority to AT86114160T priority patent/ATE46463T1/en
Priority to IN693/MAS/87A priority patent/IN170196B/en
Priority to SU874203392A priority patent/RU1801056C/en
Priority to ZA877351A priority patent/ZA877351B/en
Priority to US07/103,529 priority patent/US4829656A/en
Priority to DD87307512A priority patent/DD262375A5/en
Priority to CA000549432A priority patent/CA1318578C/en
Priority to MX008737A priority patent/MX169996B/en
Priority to BR8705427A priority patent/BR8705427A/en
Priority to JP62257045A priority patent/JP2664379B2/en
Priority to KR1019870011252A priority patent/KR940007167B1/en
Priority to CN87106902A priority patent/CN1023451C/en
Publication of EP0264459A1 publication Critical patent/EP0264459A1/en
Publication of EP0264459B1 publication Critical patent/EP0264459B1/en
Application granted granted Critical
Priority to GR89400225T priority patent/GR3000205T3/en
Priority to LV930744A priority patent/LV5599A3/en
Priority to LTRP1015A priority patent/LT2522B/xx
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • B21B1/466—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 non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B2001/028—Slabs
    • 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
    • B21B45/004—Heating the product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • the invention relates to a method for producing hot-rolled steel strip from pre-material that has already been strip-shaped, in which parts of the same length are first separated from the cast strand that has solidified after casting, in which these parts are then passed one after the other into a furnace and stored therein and brought to the rolling temperature and held, and in which finally the cast strand sections are successively introduced at a rolling temperature for rolling into a rolling mill.
  • the invention also relates to a device for carrying out this method, which consists of a continuous casting system for the continuous casting of a strip-shaped cast strand, of a cross-section device for dividing the solidified cast strand into cast strand sections and a temperature compensation and storage furnace for the cast strand sections and a downstream one Rolling mills exist, the storage furnace containing a plurality of storage locations for cast strand sections that can be operated by a transverse transport.
  • the plant for carrying out the method comprises a continuous casting plant for casting the band-shaped cast strand, one of these downstream winding device forming the band-shaped casting strand into a bundle, a cross-cutting device provided between the continuous caster and the winding device, an unwinding device downstream of the winding device for unwinding the cast strand to form a flat band, and in line with this unwinding device the rolling mill for rolling out the unwound cast strand to the hot strip.
  • the aim is to create favorable conditions for an energy-saving production of steel strip from continuous cast material by saving the facilities necessary for reheating slabs in the usual hot rolling of steel strip and also avoiding expensive intermediate transport devices and intermediate storage spaces. This is also intended to avoid the high deformation effort required for rolling out conventional slabs and the high deformation energy required for this.
  • the cast strand sections In the rolling process following the unwinding of the cast strand sections from the collar, the cast strand sections inevitably have a different temperature profile in their longitudinal direction, by means of which the quality of the steel strip produced by the subsequent rolling process can be permanently impaired. Because that is because of the unwinding of the cast strand sections from the federal government closing rolling cycle runs relatively briefly, temperature compensation in the longitudinal direction of the previously processed cast strand section can practically no longer be achieved.
  • the invention aims to provide a method for the production of hot-rolled steel strip of the known type described above and an installation for carrying out this method, with or by which the rolling out of the steel strip can take place using cast strand sections which can be carried out via their have a constant temperature profile over the entire length, resulting in a high-quality end product.
  • this object is achieved according to the invention in that, according to the characterizing part of claim 1 the cast strand sections with elongated length are introduced into the furnace and stored therein until they are rolled, that a large number of cast strand sections are pre-produced and stored until the start of rolling, and that the continuous casting is continued continuously during the rolling operation, and the cast strand sections formed thereby are introduced into the furnace and stored in turn until they are rolled.
  • the process steps indicated advantageously ensure that each cast strand section remains in the furnace for a relatively long period between the end of the casting process and the start of the rolling cycle and, as a result, practically without additional energy being supplied from the solidification temperature of the cast strand to the required one within this period Brought rolling temperature of the cast strand sections and is also held on this. Since between the storage and the beginning of rolling always a larger number of cast strand sections with stretched Length remains in the furnace, a temperature profile that is practically uniform over the entire length is obtained, especially since cast strand sections can still get into the furnace from the continuous casting installation during the rolling operation.
  • the cast strand sections in the furnace are brought from their outlet temperature from the casting machine (about 1150 ° C) to the rolling temperature (about 1050 ° C) and their residence time in the furnace to an integral multiple of the casting time is set for a cast strand section.
  • the rolling cycle for such a casting section should also last for a period of 2.5 minutes.
  • the pure rolling time can then run for about 2.5 minutes, while the subsequent pause time then comprises about 10 minutes.
  • assembly times on the rolling mill are placed in the pause times of the rolling cycles and, where appropriate, the pause times of two rolling cycles are placed directly one behind the other and that cast strand sections formed in the meantime are additionally placed in the furnace introduced and stored in it.
  • Break times of approximately 10 minutes between successive rolling cycles are usually sufficient to carry out the assembly work (roll change) required on the rolling mill. If, however, it turns out that an available pause time is not completely sufficient for the completion of the assembly work, then according to the invention two pause times can advantageously be directly strung together, to which two rolling times can then also be strung together in order to subsequently achieve the normal course of further rolling cycles.
  • a system for carrying out the method explained in detail above is particularly characterized by the features of claim 5, according to which the storage furnace with its transverse transport is set up for receiving cast strand sections in an elongated length.
  • the storage furnace contains a larger number of storage locations for cast strand sections which can be loaded one after the other, which is matched to the difference between their required residence time in the furnace and the casting time for a single cast strand section.
  • the storage furnace has - according to the teaching of claim 8 - at least the ratio 4: 1 four storage locations for cast strand sections.
  • the storage furnace contains buffer storage locations for continuous casting sections in addition to the storage locations, which during continuous operation of the continuous casting system during extended downtimes of the rolling mill between the Rolling times of two successive rolling cycles can additionally be fed with cast strand sections in an extended length.
  • the storage locations are essentially horizontally next to one another in the storage oven, while the buffer storage locations are arranged one above the other in the vertical direction and are positioned laterally of the storage locations.
  • the buffer storage spaces within the storage furnace can be set individually one after the other on the transport level of the cast strand sections and the storage spaces.
  • the cast strand sections produced during the necessary, extended downtimes of the rolling mill with continuous operation of the continuous casting installation can be done with relatively little additional effort and space without impairment of the storage spaces in the storage furnace are recorded and can be rolled out to the steel strip without any problems after the rolling mill has come to a standstill by appropriately increasing the number of successive rolling cycles, in that the successive rolling cycles are then shortened by a corresponding reduction in their break times, with the rolling remaining constant.
  • the number of buffer storage locations is provided at least equal to the number of storage storage locations in the storage furnace.
  • a transfer device for individual cast strand sections is provided between the longitudinal transport for the individual cast strand sections, the transverse transport of the storage storage spaces and the buffer storage spaces, which then comes into operation if cast strand sections have to be taken over from the longitudinal transport into the buffer storage locations or are to be transferred from these to the transverse transport for the storage storage locations.
  • the rolling mill downstream of the storage furnace is designed as a continuous finishing train.
  • This continuous finishing train can be equipped with normal finishing stands as well as with compact finishing stands.
  • the rolling mill downstream of the storage furnace is designed as a reversing stand, in particular as a Steckel rolling mill, with coil reel or reel furnaces on the outlet and inlet side.
  • the system for producing hot-rolled steel strip has a continuous casting machine 1, at the output of which a roller table 2 connects, to which a flame cutting machine 3 is assigned as a cross-cutting device for dividing the casting strand 4.
  • the liquefied material for forming the cast strand 4 is cooled in the sheet guide of the continuous casting machine.
  • the outlet temperature of the cast rod 4 at the end of the sheet guide is still above 1150 ° C.
  • the solidified cast strand 4 runs from the roller table 2 into a storage oven 5 at a temperature of approximately 1150 ° C. and is initially taken up by a roller conveyor adjacent to the roller table 2.
  • the cast strand 4 is divided by the flame cutting machine 3 into cast strand sections 4a of a predetermined length, for example of 50 meters.
  • the cast strand sections 4 retracted into the storage furnace 5 are then moved step by step by means of a transverse transport 6 within the storage furnace 5 and transversely to their longitudinal direction, the transverse transport 6 having a plurality, for example four, of storage spaces adjacent to one another at a distance.
  • the first of these storage locations is located in the storage oven 5 in the axial alignment with the roller table 2, while the last storage location in the axial alignment is provided with a roller table 7 downstream of the storage oven 5.
  • the roller conveyor 7 is assigned a roller conveyor, with the help of which the cast strand section 4a brought to the last storage location by the transverse transport 6 can be brought from the storage oven 5 onto the roller conveyor 7.
  • the continuous casting machine 1 requires a casting time of l2.5 minutes for the formation of a casting strand 4 with a length dimension of 50 meters corresponding to a casting strand section 4a, then it follows that the transverse transport 6 within the storage furnace 5 in each case Intervals of l2.5 minutes have to carry out a transport step and accordingly the passage time of each cast strand section 4a through the storage furnace 5 is approximately 50 minutes before it is transferred to the roller table 7. Shorter throughput times can also be set using idle cycles.
  • the individual cast strand sections 4a are brought to an outlet temperature of approximately 1050.degree. The temperature reduction by approximately 100 ° C. can take place within the storage furnace 5 practically without any external energy supply, the temperature profile in the longitudinal direction of the individual cast strand sections being very uniform.
  • the individual cast strand sections 4a are first passed through a descaling station 8 and then reach a continuous finishing train 9, which comprises, for example, six four-high finishing stands.
  • a cooling section 10 adjoins the continuous finishing train 9 and is effective in the area of a transport roller table 11. From the transport roller table 11, the finished rolled steel strip l2 is fed to a take-up reel l4 via a driving device l3 and is wound by the latter into a coil.
  • the roller conveyor assigned to the last storage location of the transverse transport 6 in the storage oven 5 can be designed as a pendulum roller table, with the help of which this can be done in each case located cast strand section 4a to a limited extent can move back and forth within the storage furnace 5 if necessary.
  • each cast strand section 4a arrives from the storage furnace 5 on the roller table 7 and thus into the continuous finishing train 9 only at intervals of approximately l2.5 minutes, a time of approximately l2.5 minutes is also available for each rolling cycle.
  • the actual rolling time for each cast strand section 4a within the continuous finish however, street 9 is much shorter than the available cycle time.
  • each individual rolling cycle has a pause time of approximately 10 minutes, during which the continuous finishing train 9 and consequently also all of the parts of the plant downstream of it can go out of operation.
  • all normally required assembly and conversion work on the continuous finishing train 9, in particular the roll changes on the individual four-high finishing stands can be carried out within this break time, because these break times correspond to an integral multiple, e.g. four times the required rolling time.
  • the normal pause time between two successive rolling cycles is not sufficient to completely end the assembly and conversion work to be carried out in the area of the plant adjacent to the storage furnace 5, namely in particular on the continuous finishing train 9.
  • the continuous operation of the continuous casting machine 1 must also be interrupted. That is, the cast strand sections 4a produced by the continuous casting machine 1 during the extended downtime of the system parts arranged downstream of the storage furnace 5 must additionally be accommodated in the storage furnace 5 without the operation of the transverse transport 6 having or forming the storage locations being impaired in any way becomes.
  • the storage furnace 5 is also equipped with buffer storage locations l5 for a larger number of cast strand sections 4b which are located in a region of the storage furnace 5, which lies to the side of the area containing the transverse transport 6.
  • the buffer storage locations l5 are each arranged one above the other in the vertical direction, in such a way that they can be adjusted individually and in succession to the transport level of the roller table 2 for the cast strand sections 4a and 4b by means of a lifting device l6.
  • a special transfer device is provided between the runway arranged in the region of the transverse transport 6 and in extension to the roller table 2 and the buffer storage locations l5 within the storage oven 5.
  • This for example, like the transverse transport 6, can be designed as a walking beam transport device.
  • the walking beam transport device of the transverse transport 6 only needs to be designed in such a way that it effects transport steps in only one transport direction, in the case of the transfer device assigned to the buffer storage locations l5, it is necessary to provide a design with which two transport directions that are opposite to one another are optionally available can be mastered.
  • the number of buffer storage locations l5 in the storage furnace 5 is made at least equal to the number of them select available storage locations.
  • the number of buffer storage locations l5 is selected to be even larger than that of the storage storage locations. This is because there are five buffer storage locations l5 in the case of four storage locations.
  • two cast strand sections 4a and 4b can be made if the pause times are shortened to 3.75 minutes roll out and take over from the buffer storage locations l5 to the storage locations of the transverse transport 6 in the storage furnace 5.
  • FIGS. 4 to 6 differs from that according to FIGS. 1 to 3 basically only in that the storage furnace 5 is assigned a four-high rolling mill l7 operating with a reversing operation instead of a continuously working finishing train 9 with four-high mill stands which works as a Steckel rolling mill with a coil reel or reel furnace l8 on the outlet side and a coil reel or reel furnace l9 on the inlet side.
  • Continuous casting machine 1 and storage furnace 5 are completely identical in construction and mode of operation with the system according to FIGS. 1 to 3.

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

1. Method for the production of hot-rolled steel strip from starting material continuously cast already in strip shape, in which method partial pieces (4a or 4b) of equal length are initially severed from the cast strand (4) rigidified after the casting, these partial pieces (4a, 4b) are then transferred one after the other with stretched length into a furnace (5) and stored in this as well as brought to and maintained at rolling temperature, in which method a greater number of cast strand partial pieces (4a and 4b) is preliminarily produced and stored until the beginning of rolling and individual cast strand partial pieces (4a and 4b) are introduced one after the other at rolling temperature into a rolling mill for rolling-down and in which method the continuous casting (1) is continuously continued also during the rolling operation as well as the cast strand partial pieces (4a and 4b) then formed introduced into the furnace for storage until rolling, characterised thereby, that the cast strand partial pieces (4a and 4b) severed from the cast strand (4) are exclusively introduced directly into the furnace (5) and stored therein subject to transverse transport (6), that the furnace (5) is in that case operated substantially without additional energy supply and the cast strand partial pieces (4a and 4b) are stored therein over a period which corresponds to a multiple of, for example four times their casting time, that the rolling of each individual cast strand partial piece (4a and 4b) is however carried out in a time unit which corresponds to only a fraction, for example one fifth of its casting time and that the rolling is carried out discontinuously and the rolling operation is in that case each time interrupted by an interval time over a period which corresponds to the difference between a casting time and a rolling time.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen vom warmgewalztem Stahlband aus bereits bandförmig stranggegossenem Vormaterial, bei welchem von dem nach dem Gießen erstarrten Gußstrang zunächst Teilstücke gleicher Länge abgetrennt werden, bei welchem dann diese Teilstücke nacheinander in einen Ofen geführt und in diesem gespeichert sowie auf Walztemperatur gebracht und gehalten werden, und bei welchem schließlich die Gußstrang-Teilstücke nacheinander mit Walztemperatur zum Auswalzen in ein Walzwerk eingeführt werden.The invention relates to a method for producing hot-rolled steel strip from pre-material that has already been strip-shaped, in which parts of the same length are first separated from the cast strand that has solidified after casting, in which these parts are then passed one after the other into a furnace and stored therein and brought to the rolling temperature and held, and in which finally the cast strand sections are successively introduced at a rolling temperature for rolling into a rolling mill.

Die Erfindung betrifft aber auch eine Vorrichtung zur Durchführung dieses Verfahrens, welche aus einer Stranggießanlage zum kontinuierlichen Gießen eines bandförmigen Gußstranges, aus einer Querteilvorrichtung zum Unterteilen des erstarrten Gußstranges in Gußstrang-Teilstücken und einem Temperaturausgleichs- und Speicherofen für die Gußstrang-Teilstücke sowie einem diesem nachgeordneten Walzwerke besteht, wobei der Speicherofen eine Mehrzahl von durch einen Quertransport bedienbaren Speicherplätzen für Gußstrang-Teilstücke enthält.However, the invention also relates to a device for carrying out this method, which consists of a continuous casting system for the continuous casting of a strip-shaped cast strand, of a cross-section device for dividing the solidified cast strand into cast strand sections and a temperature compensation and storage furnace for the cast strand sections and a downstream one Rolling mills exist, the storage furnace containing a plurality of storage locations for cast strand sections that can be operated by a transverse transport.

Durch die DE-PS 32 4l 745 ist es bereits bekannt, aus einem strangegossenen Vormaterial warmgewalztes Stahlband in unmittelbar aufeinanderfolgenden Arbeitssschritten dadurch herzustellen,
daß nach dem Gießen des bandförmigen Gußstrangesund nach dessen vollständiger Erstarrung dessen Aufwickeln mit Gießgeschwindigkeit zu einem Bund erfolgt und dabei das Abtrennen des Gußstranges nach Erreichen des zulässigen bzw. gewünschten Bundgewichtes stattfindet,
daß dann das Bund nach Zwischenspeicherung in einem Ofen an eine Abwickelvorrichtung übergeben wird,
daß dort das Abwickeln des Gußstranges vom Bund erfolgt und dieser dann in das Walzwerk eingeführt zum Stahlband ausgewalzt wird.From DE-PS 32 4l 745 it is already known to produce hot-rolled steel strip from a continuously cast starting material in immediately successive steps,
that after the casting of the band-shaped cast strand and after its complete solidification, it is wound up at a casting speed to form a bundle and the cast strand is separated after the permissible or desired bundle weight has been reached,
that the bundle is then transferred to an unwinder after being temporarily stored in an oven,
that there the unwinding of the cast strand from the bundle takes place and this is then rolled into the rolling mill to form the steel strip.

Die Anlage zur Durchführung des Verfahrens umfaßt eine Stranggießanlage zum Gießen des bandförmigen Gußstranges,
eine dieser nachgeordnete, den bandförmigen Gießstrang zu einem Bund formende Aufwickelvorrichtung,
eine zwischen der Stranggießanlage und der Aufwickelvorrichtung vorgesehene Querteileinrichtung,
eine der Aufwickelvorrichtung nachgeordnete Abwickelvorrichtung zum Abwickeln des Gußstranges zum einem flachen Band,
und in Linie mit dieser Abwickelvorrichtung das Walzwerk zum Auswalzen des abgewickelten Gußstranges zum Warmband.The plant for carrying out the method comprises a continuous casting plant for casting the band-shaped cast strand,
one of these downstream winding device forming the band-shaped casting strand into a bundle,
a cross-cutting device provided between the continuous caster and the winding device,
an unwinding device downstream of the winding device for unwinding the cast strand to form a flat band,
and in line with this unwinding device the rolling mill for rolling out the unwound cast strand to the hot strip.

Nach der DE-PS 32 4l 745 wird dabei angestrebt, günstige Voraussetzungen für eine energiesparende Herstellung von Stahlband aus strangegossenem Vormaterial zu schaffen, indem die bei der üblichen Warmwalzung von Stahlband notwendigen Einrichtungen zum Wiedererwärmen von Brammen eingespart sowie auch aufwendige Zwischentransporteinrichtungen und Zwischenlagerplätze vermieden werden. Auch soll hierdurch der für das Auswalzen herkömmlicher Brammen notwendige hohe Verformungsaufwand und die hierzu notwendige hohe Verformungsenergie vermieden werden.According to DE-PS 32 4l 745, the aim is to create favorable conditions for an energy-saving production of steel strip from continuous cast material by saving the facilities necessary for reheating slabs in the usual hot rolling of steel strip and also avoiding expensive intermediate transport devices and intermediate storage spaces. This is also intended to avoid the high deformation effort required for rolling out conventional slabs and the high deformation energy required for this.

Nach der DE-PS 32 4l 745 werden auch die sich aus den unterschiedlichen Geschwindigkeiten beim Gießen des Vormaterials und beim anschließenden Auswalzen desselben ergebenden Probleme ausgeräumt, weil die nach dem Stranggießen zu Bunden aufwickelten Gußstrang-Teilstücke gewissermaßen eine Pufferzone zwischen der Stranggießanlage und dem Walzwerk schaffen, welche eine unmittelbare Abhängigkeit zwischen Gießgeschwindigkeit und Walzgeschwindigkeit vermeidet.According to DE-PS 32 4l 745, the problems resulting from the different speeds during the casting of the primary material and during the subsequent rolling out of the same are eliminated, because the cast strand sections wound up into coils after the continuous casting to a certain extent create a buffer zone between the continuous casting plant and the rolling mill , which avoids a direct dependency between casting speed and rolling speed.

Beträchtliche Unzulänglichkeiten beim Verfahren und bei der Anlage nach dem Stand der Technik erwachsen jedoch daraus, daß nicht jedes bandförmig strangegossene Vormaterial nach seiner Erstarrung ohne weiteres zu Bunden gewickelt werden kann. Dehalb muß regelmäßig zwischen der Stranggießanlage und der Aufwickelvorrichtung noch ein Reduziergerüst vorgesehen werden, mit dem der Gußstrang in einem Temperaturbereich, der zwischen der Erstarrungstempe ratur und der üblichen Walztemperatur liegt, auf einen sich zum Aufwickeln und zum anschließenden Abwickeln bei Walztemperatur eignenden Querschnitt vermindert wird.Considerable shortcomings in the method and in the system according to the prior art, however, arise from the fact that not every strip-shaped, continuously cast starting material can be wound into bundles after it has solidified. Dehalb must be regularly provided between the continuous caster and the winding device, a reduction stand with which the cast strand is reduced in a temperature range between the solidification temperature and the usual rolling temperature, to a cross-section suitable for winding and subsequent unwinding at the rolling temperature.

Nachteilig ist es nach dem Stand der Technik aber auch, daß das Abkühlen der zu einem Bund aufgewickelten Gußstrang-Teilstücke im Ofen von der Erstarrungstemperatur auf die Walztemperatur nicht gleichmäßig stattfindet, sondern in den äußeren Wickellagen des Bandbundes schneller abläuft als im Bereich der inneren Wickellagen des Bundes.It is also disadvantageous according to the prior art that the cooling of the cast strand sections wound into a bundle in the furnace does not take place uniformly from the solidification temperature to the rolling temperature, but rather takes place faster in the outer winding layers of the coil than in the area of the inner winding layers of the Federal.

Bei dem sich an das Abwickeln der Gußstrang-Teilstücke vom Bund anschließenden Walzvorgang weisen daher die Gußstrang-Teilstücke in ihrer Längsrichtung zwangsläufig ein unterschiedliches Temperaturprofil auf, durch welches die Qualität des durch den anschließenden Walzprozeß hergestellten Stahlbandes nachhaltig beeinträchtigt werden kann. Da nämlich der sich an das Abwickeln der Gußstrang-Teilstücke vom Bund an schließende Walzzyklus relativ kurzzeitig abläuft, kann ein Temperaturausgleich in Längsrichtung des zuvor abgewickelten Gußstrang-Teilstücks praktisch nicht mehr zustande kommen.In the rolling process following the unwinding of the cast strand sections from the collar, the cast strand sections inevitably have a different temperature profile in their longitudinal direction, by means of which the quality of the steel strip produced by the subsequent rolling process can be permanently impaired. Because that is because of the unwinding of the cast strand sections from the federal government closing rolling cycle runs relatively briefly, temperature compensation in the longitudinal direction of the previously processed cast strand section can practically no longer be achieved.

Die Erfindung zielt darauf ab, ein Verfahren zum Herstellen von warmgewalztem Stahlband der eingangs beschriebenen, bekannten Art sowie eine Anlage zur Durchführung dieses Verfahrens anzugeben, mit dem bzw. durch die das Auswalzen des Stahlbandes unter Benutzung von Gußstrang-Teilstücken stattfinden kann, die über ihre ganze Länge ein gleichbleibendes Temperaturprofil aufweisen und dadurch ein qualitativ hochwertiges Endprodukt ergeben.The invention aims to provide a method for the production of hot-rolled steel strip of the known type described above and an installation for carrying out this method, with or by which the rolling out of the steel strip can take place using cast strand sections which can be carried out via their have a constant temperature profile over the entire length, resulting in a high-quality end product.

Gelöst wird diese Aufgabe in verfahrenstechnischer Hinsicht erfindungsgemäß dadurch, daß nach dem Kennzeichen des Anspruchs l
die Gußstrang-Teilstücke mit gestreckter Länge in den Ofen eingeführt und bis zur Walzung darin gespeichert werden,
daß dabei bis zum Walzbeginn eine größere Anzahl von Gußstrang-Teilstücken vorproduziert und gespeichert wird,
und daß das Stranggießen auch während des Walzbetriebes kontinuierlich fortgesetzt wird sowie die dabei gebildeten Gußstrang-Teilstücke in den Ofen eingeführt und darin wiederum bis zu Walzung gespeichert werden.In technical terms, this object is achieved according to the invention in that, according to the characterizing part of claim 1
the cast strand sections with elongated length are introduced into the furnace and stored therein until they are rolled,
that a large number of cast strand sections are pre-produced and stored until the start of rolling,
and that the continuous casting is continued continuously during the rolling operation, and the cast strand sections formed thereby are introduced into the furnace and stored in turn until they are rolled.

Durch die angegebenen Verfahrensschritte wird in vorteilhafter Weise erreicht, daß jedes Gußstrang-Teilstück zwischen der Beendigung des Gießvorgangs und dem Beginn des Walzzyklus über einen relativ langen Zeitraum im Ofen verbleibt und dadurch innerhalb dieses Zeitraumes praktisch ohne zusätzliche Energiezufuhr von der Erstarrungstemperatur des Gußstranges auf die erforderliche Walztemperatur der Gußstrang-Teilstücke gebracht und auch auf dieser gehalten wird. Da zwischen der Einspeicherung und dem Walzbeginn immer eine größere Anzahl von Gußstrang-Teilstücken mit gestreckter Länge im Ofen verweilt, stellt sich an diesen ein praktisch über die ganze Länge gleichmäßiges Temperaturprofil ein, zumal auch während des Walzbetriebes noch Gußstrang-Teilstücke von der Stranggießanlage her in den Ofen gelangen können.The process steps indicated advantageously ensure that each cast strand section remains in the furnace for a relatively long period between the end of the casting process and the start of the rolling cycle and, as a result, practically without additional energy being supplied from the solidification temperature of the cast strand to the required one within this period Brought rolling temperature of the cast strand sections and is also held on this. Since between the storage and the beginning of rolling always a larger number of cast strand sections with stretched Length remains in the furnace, a temperature profile that is practically uniform over the entire length is obtained, especially since cast strand sections can still get into the furnace from the continuous casting installation during the rolling operation.

Gemäß der Erfindung ist nach Anspruch 2 vorgesehen, daß die Gußstrang-Teilstücke im Ofen von ihrer Auslauftemperatur aus der Gießmaschine (etwa ll50°C) auf Walztemperatur (etwa l050°C) gebracht werden und dazu ihre Verweilzeit im Ofen auf ein ganzzahliges Vielfaches der Gießzeit für ein Gußstrang-Teilstück eingestellt wird.According to the invention it is provided according to claim 2 that the cast strand sections in the furnace are brought from their outlet temperature from the casting machine (about 1150 ° C) to the rolling temperature (about 1050 ° C) and their residence time in the furnace to an integral multiple of the casting time is set for a cast strand section.

Beträgt bspw. die Gießzeit für ein Gußstrang-Teilstück mit einem Querschnitt von 50 × l600mm bei 50 Metern Länge l2,5 Minuten, dann sollte die Verweilzeit für jedes einzelne Gußstrang-Teilstück im Ofen, bspw. 4 × l2,5 = 50 Minuten betragen, damit die Walztemperatur sich möglichst gleichmäßig über die ganze Länge der Gußstrang-Teilstücke einstellt.For example, if the casting time for a casting section with a cross section of 50 × l600mm at 50 meters length is l2.5 minutes, then the dwell time for each individual casting section in the furnace should be, for example, 4 × l2.5 = 50 minutes , so that the rolling temperature is as uniform as possible over the entire length of the cast strand sections.

Ein optimales Arbeitsergebnis läßt sich erfindungsgemäß dann erreichen, wenn gemäß Anspruch 3 der Walzzyklus für ein einzelnes Gußstrang-Teilstück zeitlich auf den Gießzyklus für ein solches Gußstrang-Teilstück abgestimmt und dabei jeder Walzzyklus von einer relativ kurzen Walzzeit und einer relativ langen Pausenzeit bestimmt w ird.An optimal work result can be achieved according to the invention if, according to claim 3, the rolling cycle for a single casting section is timed to the casting cycle for such a casting section and each rolling cycle is determined by a relatively short rolling time and a relatively long pause time.

Wenn also z.B. der Gießzyklus für ein einzelnes Gußstrang-Teilstück von 50 Metern Länge l2,5 Minuten beträgt, sollte auch der Walzzyklus für ein solches Gußstrang-Teilstück einen Zeitraum von l2,5 Minuten umfassen. Dabei kann die reine Walzzeit etwa innerhalb 2,5 Minuten ablaufen, während die nachfolgende Pausenzeit dann etwa l0 Minuten umfaßt.If, for example, the casting cycle for a single casting section of 50 meters in length is 2.5 minutes, the rolling cycle for such a casting section should also last for a period of 2.5 minutes. The pure rolling time can then run for about 2.5 minutes, while the subsequent pause time then comprises about 10 minutes.

Besonders vorteilhaft wirkt es sich nach der Erfindung in verfahrenstechnischer Hinsicht aus, daß gemäß Anspruch 4 Montagezeiten am Walzwerk (Walzenwechsel) in die Pausenzeiten der Walzzyklen gelegt und dabei gegebenenfalls die Pausenzeiten zweier Walzzyklen unmittelbar hintereinandergesetzt werden und daß währenddessen gebildete Gußstrang-Teilstücke zusätzlich in den Ofen eingeführt und darin gespeichert werden.It is particularly advantageous in terms of process technology according to the invention that, according to claim 4, assembly times on the rolling mill (roll change) are placed in the pause times of the rolling cycles and, where appropriate, the pause times of two rolling cycles are placed directly one behind the other and that cast strand sections formed in the meantime are additionally placed in the furnace introduced and stored in it.

Regelmäßig reichen Pausenzeiten von etwa l0 Minuten zwischen aufeinanderfolgenden Walzzyklen aus, um die am Walzwerk notwendigen Montagearbeiten (Walzenwechsel) durchzuführen. Ergibt sich jedoch, daß eine verfügbare Pausenzeit für die Beendigung der Montagearbeiten nicht völlig ausreicht, dann lassen sich erfindungsgemäß in vorteilhafter Weise zwei Pausenzeiten unmittelbar aneinanderreihen, an die sich dann zur nachfolgenden Erzielung des normalen Ablaufs weiterer Walzzyklen auch zwei Walzzeiten unmittelbar aneinanderreihen können.Break times of approximately 10 minutes between successive rolling cycles are usually sufficient to carry out the assembly work (roll change) required on the rolling mill. If, however, it turns out that an available pause time is not completely sufficient for the completion of the assembly work, then according to the invention two pause times can advantageously be directly strung together, to which two rolling times can then also be strung together in order to subsequently achieve the normal course of further rolling cycles.

Eine Anlage zur Durchführung des vorstehend im einzelnen erläuterten Verfahrens ist besonders gekennzeichnet durch die Merkmale des Anspruchs 5, wonach der Speicherofen mit seinem Quertransport für die Aufnahme von Gußstrang-Teilstücken in gestreckter Länge eingerichtet ist.A system for carrying out the method explained in detail above is particularly characterized by the features of claim 5, according to which the storage furnace with its transverse transport is set up for receiving cast strand sections in an elongated length.

Gemäß Anspruch 6 ist es dabei von Vorteil, wenn der Speicherofen eine größere Anzahl von jeweils nacheinander beschickbaren Speicherplätzen für Gußstrang-Teilstücke enthält, welche auf die Differenz ihrer notwendigen Verweilzeit im Ofen zur Gießzeit für ein einzelnes Gußstrang-Teilstück abgestimmt ist.According to claim 6, it is advantageous if the storage furnace contains a larger number of storage locations for cast strand sections which can be loaded one after the other, which is matched to the difference between their required residence time in the furnace and the casting time for a single cast strand section.

Beträgt daher die Gießzeit für ein einzelnes Gußstrang-Teilstück etwa l2,5 Minuten und muß die Verweilzeit für die Gußstrang-Teilstücke im Speicherofen etwa 50 Minuten betragen, dann weist - entsprechend der Lehre des Anspruchs 8 - der Speicherofen entsprechend dem Verhältnis 4:l mindestens vier Vorrats-Speicherplätze für Gußstrang-Teilstücke auf.Therefore, if the casting time for a single cast strand section is approximately l2.5 minutes and the dwell time for the cast section sections in the storage furnace is approximately 50 minutes, then the storage furnace has - according to the teaching of claim 8 - at least the ratio 4: 1 four storage locations for cast strand sections.

Ein besonders wichtiges Ausbildungsmerkmal der erfindungsgemäßen Anlage zum Herstellen von warmgewalztem Stahlband besteht jedoch nach Anspruch 7 darin, daß der Speicherofen außer den Vorrats-Speicherplätzen noch Puffer-Speicherplätze für Strangguß-Teilstücke enthält, die bei kontinuierlichem Betrieb der Stranggießanlage während verlängerter Stillstandszeiten des Walzwerks zwischen den Walzzeiten zweier aufeinanderfolgender Walzzyklen zusätzlich mit Gußstrang-Teilstücken in gestreckter Länge beschickbar sind.A particularly important training feature of the system according to the invention for the production of hot-rolled steel strip is, however, according to claim 7, that the storage furnace contains buffer storage locations for continuous casting sections in addition to the storage locations, which during continuous operation of the continuous casting system during extended downtimes of the rolling mill between the Rolling times of two successive rolling cycles can additionally be fed with cast strand sections in an extended length.

Nach der Erfindung bewährt es sich dabei besonders, wenn gemäß Anspruch 8 im Speicherofen die Vorrats-Speicherplätze im wesentlichen horizontal nebeneinander liegen, während die Puffer-Speicherplätze in Höhenrichtung übereinander angeordnet sowie seitlich von den Vorrats-Speicherplätzen positioniert sind.According to the invention, it proves particularly useful if, according to claim 8, the storage locations are essentially horizontally next to one another in the storage oven, while the buffer storage locations are arranged one above the other in the vertical direction and are positioned laterally of the storage locations.

Während üblicherweise die Vorrats-Speicherplätze ständig etwa auf gleicher Höhe nebeneinander liegen, ist erfindungsgemäß nach Anspruch 9 in Vorschlag gebracht, daß die Puffer-Speicherplätze innerhalb des Speicherofens einzeln nacheinander auf die Transportebene der Gußstrang-Teilstücke und der Vorrats-Speicherplätze einstellbar sind.While usually the storage spaces are always next to each other at approximately the same height, it is proposed according to the invention that the buffer storage spaces within the storage furnace can be set individually one after the other on the transport level of the cast strand sections and the storage spaces.

Die während notwendiger, verlängerter Stillstandzeiten des Walzwerkes bei kontinuierlichem Betrieb der Stranggießanlage gefertigten Gußstrang-Teilstücke können mit relativ geringem zusätzlichem Aufwand und Platzbedarf ohne Beeinträchtigung der Vorrats-Speicherplätze im Speicherofen aufgenommen werden und lassen sich nach Beendigung der Stillstandzeit des Walzwerkes durch entsprechende Vermehrung aufeinanderfolgender Walzzyklen völlig problemlos zum Stahlband auswalzen, indem dann nämlich - bei gleichbleibender Walzz eit - die aufeinanderfolgenden Walzzyklen durch entsprechende Verminderung ihrer Pausenzeiten verkürzt werden.The cast strand sections produced during the necessary, extended downtimes of the rolling mill with continuous operation of the continuous casting installation can be done with relatively little additional effort and space without impairment of the storage spaces in the storage furnace are recorded and can be rolled out to the steel strip without any problems after the rolling mill has come to a standstill by appropriately increasing the number of successive rolling cycles, in that the successive rolling cycles are then shortened by a corresponding reduction in their break times, with the rolling remaining constant.

Geht man davon aus, daß die effektive Walzzeit für ein einzelnes Gußstrang-Teilstück 2,5 Minuten beträgt und bei einem normalen Walzzyklus die Pausenzeit etwa l0 Minuten ausmacht, dann können innerhalb dieser normalerweise üblichen Pausenzeit problemlos noch zwei auf den Puffer-Seicherplätzen befindliche Strangguß-Teilstücke zusätzlich ausgewalzt werden, wenn die wirkliche Pausenzeit zwischen zwei Walzzeiten jeweils auf etwa l,7 Minuten reduziert wird. Während zweier normaler Walzzyklen könnten daher ohne weiteres bis zu vier in den Puffer-Speicherplätzen aufgenommene Gußstrang- Teilstücke zusätzlich ausgewalzt werden, um anschließend wieder den Normalbetrieb der Anlage zu ermöglichen.If one assumes that the effective rolling time for a single cast strand section is 2.5 minutes and that the break time in a normal rolling cycle is about 10 minutes, then two continuous castings located on the buffer storage locations can easily be found within this normally usual break time. Parts are additionally rolled out if the actual pause time between two rolling times is reduced to approximately 1.7 minutes. During two normal rolling cycles, up to four cast strand sections accommodated in the buffer storage locations could therefore additionally be rolled out in order to then enable normal operation of the system again.

Nach Anspruch l0 ist es im Hinblick auf die oben gemachten Ausführungen besonders empfehlenswert, daß im Speicherofen die Anzahl der Puffer-Speicherplätze mindestens gleich der Anzahl der Vorrats-Speicherplätze vorgesehen ist.According to claim l0, it is particularly recommended with regard to the statements made above that the number of buffer storage locations is provided at least equal to the number of storage storage locations in the storage furnace.

Für einen ordnungsgemäße Betrieb der Anlage ist desweiteren wichtig, daß nach Anspruch ll zwischen dem Längstransport für die einzelnen Gußstrang-Teilstücke, dem Quertransport der Vorrats-Speicherplätze und den Puffer-Speicherplätzen eine Übergabevorrichtung für einzelne Gußstrang-Teilstücke vorgesehen ist, die dann in Tätigkeit tritt, wenn Gußstrang-Teilstücke vom Längstransport in die Puffer-Speicherplätze übernommen werden müssen oder aber von diesen an den Quertransport für die Vorrats-Speicherplätze übergeben werden sollen.For proper operation of the system it is also important that a transfer device for individual cast strand sections is provided between the longitudinal transport for the individual cast strand sections, the transverse transport of the storage storage spaces and the buffer storage spaces, which then comes into operation if cast strand sections have to be taken over from the longitudinal transport into the buffer storage locations or are to be transferred from these to the transverse transport for the storage storage locations.

Nach Anspruch l2 liegt es dabei im Rahmen der Erfindung, daß das dem Speicherofen nachgeordnete Walzwerk als kontinuierliche Fertigstraße ausgelegt ist. Diese kontinuierliche Fertigstraße kann dabei sowohl mit normalen Fertigwalzgerüsten als auch mit Kompakt-Fertigwalzgerüsten ausgestattet werden.According to claim l2, it is within the scope of the invention that the rolling mill downstream of the storage furnace is designed as a continuous finishing train. This continuous finishing train can be equipped with normal finishing stands as well as with compact finishing stands.

Nach Anspruch l3 ist es schließlich aber auch möglich, daß das dem Speicherofen nachgeordnete Walzwerk als Reversiergerüst, insbesondere als Steckel-Walzwerk, mit auslauf- und einlaufseitigen Bundhaspel bzw. -haspelöfen ausgelegt ist.According to claim l3, it is finally also possible that the rolling mill downstream of the storage furnace is designed as a reversing stand, in particular as a Steckel rolling mill, with coil reel or reel furnaces on the outlet and inlet side.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt. Es zeigen

  • Figur l in prinzipieller Seitenansicht eine Anlage zum Herstellen von warmgewalztem Stahlband aus bandförmig stranggegossenem Vormaterial,
  • Figur 2 die Anlage nach Fig. l in der Draufsicht,
  • Figur 3 einen Schnitt entlang der Linie III-III in Fig. 2,
  • Figur 4 eine abgewandelte Bauart einer Anlage zum Herstellen von warmgewalztem Stahlband aus bandförmig stranggegossenem Vormaterial,
  • Figur 5 eine Draufsicht auf die Anlage nach Fig. 4 und
  • Figur 6 einen Schnitt entlang der Linie VI-VI in Fig. 5.
Embodiments of the invention are shown in the drawing. Show it
  • FIG. 1 shows a basic side view of a plant for producing hot-rolled steel strip from strip-shaped continuous material,
  • FIG. 2 shows the plant according to FIG. 1 in a top view,
  • FIG. 3 shows a section along the line III-III in FIG. 2,
  • FIG. 4 shows a modified design of a plant for producing hot-rolled steel strip from strip-shaped continuous material,
  • Figure 5 is a plan view of the system of Fig. 4 and
  • FIG. 6 shows a section along the line VI-VI in FIG. 5.

Nach den Fig. l und 2 sowie 4 und 5 der Zeichnung weist die Anlage zum Herstellen von warmgewalztem Stahlband eine Stranggießmaschine l auf, an deren Ausgang ein Rollgang 2 anschließt, dem als Querteilvorrichtung eine Brennschneidmaschine 3 zum Unterteilen des Gußstrangs 4 zugeordnet ist.According to FIGS. 1 and 2 and 4 and 5 of the drawing, the system for producing hot-rolled steel strip has a continuous casting machine 1, at the output of which a roller table 2 connects, to which a flame cutting machine 3 is assigned as a cross-cutting device for dividing the casting strand 4.

Das verflüssigte Material zur Bildung des Gußstrangs 4 wird in der Bogenführung der Stranggießmaschine abgekühlt. Die Austrittstemperatur des Gußstanges 4 am Ende der Bogenführung liegt noch oberhalb von ll50°C.The liquefied material for forming the cast strand 4 is cooled in the sheet guide of the continuous casting machine. The outlet temperature of the cast rod 4 at the end of the sheet guide is still above 1150 ° C.

Vom Rollgang 2 läuft der erstarrte Gußstrang 4 etwa mit einer Temperatur von ll50°C in einen Speicherofen 5 ein und wird in diesem zunächst von einer sich an den Rollgang 2 anschließenden Rollbahn aufgenommen. Dabei wird der Gußstrang 4 von der Brennschneidmaschine 3 in Gußstrang-Teilstücke 4a vorgegebener Länge, bspw. von 50 Metern, unterteilt.The solidified cast strand 4 runs from the roller table 2 into a storage oven 5 at a temperature of approximately 1150 ° C. and is initially taken up by a roller conveyor adjacent to the roller table 2. Here, the cast strand 4 is divided by the flame cutting machine 3 into cast strand sections 4a of a predetermined length, for example of 50 meters.

Die in den Speicherofen 5 eingefahrenen Gußstrang-Teilstücke 4 werden sodann durch einen Quertransport 6 innerhalb des Speicherofens 5 und quer zu ihrer Längsrichtung schrittweise bewegt, wobei der Quertransport 6 mehrere, bspw. vier, mit Abstand nebeneinanderliegende Vorrats-Speicherplätze aufweist. De r erste dieser Vorrats-Speicherplätze befindet sich dabei im Speicherofen 5 in Achsfluchtlage mit dem Rollgang 2, während der letzte Speicherplatz in Achsfluchtlage mit einem dem Speicherofen 5 nachgeordneten Ablaufrollgang 7 vorgesehen ist.The cast strand sections 4 retracted into the storage furnace 5 are then moved step by step by means of a transverse transport 6 within the storage furnace 5 and transversely to their longitudinal direction, the transverse transport 6 having a plurality, for example four, of storage spaces adjacent to one another at a distance. The first of these storage locations is located in the storage oven 5 in the axial alignment with the roller table 2, while the last storage location in the axial alignment is provided with a roller table 7 downstream of the storage oven 5.

Innerhalb des Speicherofens 5 ist dem Ablaufrollgang 7 eine Rollenbahn zugeordnet, mit deren Hilfe das durch den Quertransport 6 auf den letzten Speicherplatz gebrachte Gußstrang-Teilstück 4a aus dem Speicherofen 5 auf den Ablaufrollgang 7 gebracht werden kann.Within the storage furnace 5, the roller conveyor 7 is assigned a roller conveyor, with the help of which the cast strand section 4a brought to the last storage location by the transverse transport 6 can be brought from the storage oven 5 onto the roller conveyor 7.

Wenn unterstellt wird, daß die Stranggießmaschine l für die Bildung eines Gußstranges 4 mit einer einem Gußstrang-Teilstück 4a entsprechenden Längenabmessung von 50 Metern eine Gießzeit von l2,5 Minuten benötigt, dann ergibt sich hieraus, daß der Quertransport 6 innerhalb des Speicherofens 5 jeweils in Zeitabständen von l2,5 Minuten einen Transportschritt auszuführen hat und daß demnach die Durchlaufzeit jedes Gußstrang-Teilstücks 4a durch den Speicherofen 5 etwa 50 Minuten beträgt, bevor es an den Ablaufrollgang 7 übergeben wird. Durch Leertakte können auch kürzere Durchlaufzeiten eingestellt werden. Innerhalb des Speicherofens 5 werden die einzelnen Gußstrang-Teilstücke 4a unter Beibehaltung ihrer gestreckten Länge gegenüber der bei ll50°C liegenden Einlauftemperatur auf eine Auslauftemperatur von etwa l050°C - die Walztemperatur -gebracht. Die Temperaturverminderung um etwa l00°C kann innerhalb des Speicherofens 5 praktisch ohne jegliche äußere Engergiezufuhr stattfinden, wobei das Temperaturprofil in Längsrichtung der einzelnen Gußstrang-Teilstücke sehr gleichmäßig ausfällt.If it is assumed that the continuous casting machine 1 requires a casting time of l2.5 minutes for the formation of a casting strand 4 with a length dimension of 50 meters corresponding to a casting strand section 4a, then it follows that the transverse transport 6 within the storage furnace 5 in each case Intervals of l2.5 minutes have to carry out a transport step and accordingly the passage time of each cast strand section 4a through the storage furnace 5 is approximately 50 minutes before it is transferred to the roller table 7. Shorter throughput times can also be set using idle cycles. Within the storage furnace 5, the individual cast strand sections 4a are brought to an outlet temperature of approximately 1050.degree. The temperature reduction by approximately 100 ° C. can take place within the storage furnace 5 practically without any external energy supply, the temperature profile in the longitudinal direction of the individual cast strand sections being very uniform.

Vom Ablaufrollgang 7 werden die einzelnen Gußstrang-Teilstücke 4a zunächst durch eine Entzunderungsstation 8 geführt und gelangen dann in eine kontinuierliche Fertigstraße 9, die bspw. sechs Quarto-Fertiggerüste umfaßt. An die kontinuierliche Fertigstraße 9 schließt sich eine Kühlstrecke l0 an, die im Bereich eines Transportrollgangs ll wirksam ist. Vom Transportrollgang ll wird das fertiggewalzte Stahlband l2 über einen Treibapparat l3 einem Aufwickelhaspel l4 zugeführt und von diesem zu einem Bandbund gewickelt.From the roller table 7, the individual cast strand sections 4a are first passed through a descaling station 8 and then reach a continuous finishing train 9, which comprises, for example, six four-high finishing stands. A cooling section 10 adjoins the continuous finishing train 9 and is effective in the area of a transport roller table 11. From the transport roller table 11, the finished rolled steel strip l2 is fed to a take-up reel l4 via a driving device l3 and is wound by the latter into a coil.

Die dem letzten Speicherplatz des Quertransportes 6 zugeordnete Rollenbahn im Speicherofen 5 kann als Pendelrollgang ausgelegt werden, mit dessen Hilfe sich das jeweils daruf befindliche Gußstrang-Teilstück 4a in begrenztem Maße innerhalb des Speicherofens 5 bedarfsweise in Längsrichtung hin und her bewegen läßt.The roller conveyor assigned to the last storage location of the transverse transport 6 in the storage oven 5 can be designed as a pendulum roller table, with the help of which this can be done in each case located cast strand section 4a to a limited extent can move back and forth within the storage furnace 5 if necessary.

Es ist erkennbar, daß in der aus den Fig. l und 2 ersichtlichen Anlage vom Beginn des Stranggießprozesses bis zum Walzbeginn eine größere Anzahl, nämlich vier, Gußstrang-Teilstücke 4a vorproduziert und in gestreckter Länge gespeichert werden. Hierdurch wird bezweckt, daß die einzelnen Strangguß-Teilstücke innerhalb des Speicherofens 5 ohne jegliche, zumindest aber ohne wesentliche zusätzliche Einwirkung von der Erstarrungstemperatur des Gußstranges 4 auf die Walztemperatur von etwa l050°C gebracht werden. Dies wird einfach dadurch erreicht, daß die für die Fertigstellung eines Gußstrang-Teilstücks 4a notwendige Gießzeit der Stranggießmaschine durch die Speicherplätze auf dem Quertransport 6 im Speicherofen 5 entsprechend vervielfacht, bspw. vervierfacht wird, bevor der Walzzyklus für das betreffende Gußstrang-Teilstück 4a beginnt.It can be seen that in the plant shown in FIGS. 1 and 2, from the start of the continuous casting process to the start of rolling, a larger number, namely four, cast strand sections 4a are pre-produced and stored in stretched length. The purpose of this is that the individual continuous casting sections within the storage furnace 5 are brought from the solidification temperature of the casting strand 4 to the rolling temperature of approximately 1050 ° C. without any, or at least without any significant additional action. This is achieved simply by multiplying, for example, quadrupling the casting time of the continuous casting machine required for the completion of a cast strand section 4a by the storage locations on the transverse transport 6 in the storage furnace 5 before the rolling cycle for the relevant cast strand section 4a begins.

Bei einer Gießzeit von l2,5 Minuten steht also innerhalb des Speicherofens 5 zur Erreichung der Walztemperatur von l050°C eine Verweilszeit von 50 Minuten zur Verfügung, die allerdings im Bedarfsfall durch Leertakte reduziert werden kann.With a casting time of l2.5 minutes, there is a dwell time of 50 minutes within the storage furnace 5 to reach the rolling temperature of l050 ° C, which, however, can be reduced by empty cycles if necessary.

Während der Verweilzeit der einzelnen Gußstrang-Teilstücke 4a im Speicherofen 5 wird natürlich die kontinuierliche Gießarbeit der Stranggießmaschine l fortgesetzt.During the dwell time of the individual cast strand sections 4a in the storage furnace 5, the continuous casting work of the continuous casting machine 1 is naturally continued.

Da nur in Zeitabständen von etwa l2,5 Minuten ein Gußstrang-Teilstück 4a aus dem Speicherofen 5 auf den Ablaufrollgang 7 und damit in die kontinuierliche Fertigstraße 9 gelangt, steht auch für jeden Walzzyklus eine Zeit von etwa l2,5 Minuten zur Verfügung. Die eigentliche Wa lzzeit für jedes Gußstrang-Teilstück 4a innerhalb der kontinuierlichen Fertig straße 9 fällt aber wesentlich kürzer aus, als die verfügbare Zykluszeit. Sie beträgt bspw. bei einem Gußstrang-Teilstück 4a mit einer Querschnittsabmessung von 50 × l600mm bei 50 Meter Ausgangslänge nur etwa 2,5 Minuten. Demnach umfaßt jeder einzelne Walzzyklus eine Pausenzeit von etwa l0 Minuten, während der die kontinuierliche Fertigstraße 9 und folglich auch alle ihr nachgeordneten Anlagenteile außer Betrieb gehen können. Innerhalb dieser Pausenzeit lassen sich folglich alle normalerweise notwendigen Montage- und Umbauarbeiten an der kontinuierlichen Fertigstraße 9, insbesondere die Walzenwechsel an den einzelnen Quarto-Fertiggerüsten durchführen, weil diese Pausenzeiten einem ganzzahligen Vielfachen, bspw. dem Vierfachen der notwendigen Walzzeit entsprechen.Since a cast strand section 4a arrives from the storage furnace 5 on the roller table 7 and thus into the continuous finishing train 9 only at intervals of approximately l2.5 minutes, a time of approximately l2.5 minutes is also available for each rolling cycle. The actual rolling time for each cast strand section 4a within the continuous finish however, street 9 is much shorter than the available cycle time. For example, in the case of a cast strand section 4a with a cross-sectional dimension of 50 × 1600 mm at an initial length of 50 meters, it is only about 2.5 minutes. Accordingly, each individual rolling cycle has a pause time of approximately 10 minutes, during which the continuous finishing train 9 and consequently also all of the parts of the plant downstream of it can go out of operation. As a result, all normally required assembly and conversion work on the continuous finishing train 9, in particular the roll changes on the individual four-high finishing stands, can be carried out within this break time, because these break times correspond to an integral multiple, e.g. four times the required rolling time.

In manchen Fällen kann es jedoch durchaus vorkommen, daß die normale Pausenzeit zwischen zwei aufeinanderfolgenden Walzzyklen nicht ausreicht, um die durchzuführenden Montage-und Umbauarbeiten in dem an den Speicherofen 5 anschließenden Anlagenbereich, nämlich insbesondere an der kontinuierlichen Fertigstraße 9 vollständig zu beenden.In some cases, however, it may well happen that the normal pause time between two successive rolling cycles is not sufficient to completely end the assembly and conversion work to be carried out in the area of the plant adjacent to the storage furnace 5, namely in particular on the continuous finishing train 9.

Es ist dann natürlich unumgänglich, die Stillstandszeit der dem Speicherofen 5 nachgeordneten Anlageteile entsprechend zu verlängern.It is then inevitable, of course, to extend the downtime of the system parts downstream of the storage furnace 5 accordingly.

Zugleich soll aber ausgeschlossen werden, daß auch der kontinuierliche Betrieb der Stranggießmaschine l unterbrochen werden muß. D.h., die während der verlängerten Stillstandszeit der dem Speicherofen 5 nachgeordneten Anlagenteile von der Stranggießmaschine l produzierten Gußstrang-Teilstücke 4a müssen zusätzlich im Speicherofen 5 aufgenommen werden, ohne daß darin der Betrieb des die Vorrats-Speicherplätze aufweisenden bzw. bildenden Quertransportes 6 in irgendeiner Weise beeinträchtigt wird.At the same time, however, it should be excluded that the continuous operation of the continuous casting machine 1 must also be interrupted. That is, the cast strand sections 4a produced by the continuous casting machine 1 during the extended downtime of the system parts arranged downstream of the storage furnace 5 must additionally be accommodated in the storage furnace 5 without the operation of the transverse transport 6 having or forming the storage locations being impaired in any way becomes.

Um das zu ermöglichen, ist der Speicherofen 5 zusätzlich zu den Vorrats-Speicherplätzen auf dem im wesentlichen horizontal orientierten Quertransports 6 noch mit Puffer-Speicherplätzen l5 für eine größere Anzahl von Gußstrang-Teilstücken 4b ausgerüstet, die sich in einem Bereich des Speicherofens 5 befinden, welcher seitlich neben dem den Quertransport 6 enthaltenden Bereich liegt. Hierin sind die Puffer-Speicherplätze l5 jeweils in Höhenrichtung mit Abstand übereinander angeordnet, und zwar so, daß sie mittels einer Hubvorrichtung l6 einzeln und nacheinander auf die Transportebene des Rollgangs 2 für die Gußstrang-Teilstücke 4a und 4b eingestellt werden können.To make this possible, in addition to the storage locations on the essentially horizontally oriented transverse transport 6, the storage furnace 5 is also equipped with buffer storage locations l5 for a larger number of cast strand sections 4b which are located in a region of the storage furnace 5, which lies to the side of the area containing the transverse transport 6. Here, the buffer storage locations l5 are each arranged one above the other in the vertical direction, in such a way that they can be adjusted individually and in succession to the transport level of the roller table 2 for the cast strand sections 4a and 4b by means of a lifting device l6.

Damit die einzelnen Puffer-Speicherplätze l5 sich mit den Gußstrang-Teilstücken 4b beschicken lassen, ist zwischen der im Bereich des Quertransportes 6 und in Verlängerung zum Rollgang 2 angeordneten Rollbahn und dem Puffer-Speicherplätzen l5 innerhalb des Speicherofens 5 eine besondere Übergabevorrichtung vorgesehen. Diese kann bspw., ebenso wie der Quertransport 6, als Hubbalken-Transportvorrichtung ausgeführt werden. Während jedoch die Hubbalken-Transportvorrichtung des Quertransportes 6 lediglich so ausgelegt zu werden braucht, daß sie Transportschritte nur in einer Transportrichtung bewirkt, ist es im Falle der den Puffer-Speicherplätzen l5 zugeordneten Übergabevorrichtung notwendig, eine Auslegung vorzusehen, mit der wahlweise zwei zueinander entgegengesetzte Transportrichtungen bewältigt werden können. Während es nämlich für die Beschickung der Puffer-Speicherplätze l5 mit Gußstrang-Teilstücken 4b notwendig ist, jeweils Transportschritte vom Quertransport 6 weg zu den Puffer-Speicherplätzen l5 hin zu vollführen, muß die Übergabevorrichtung zum späteren Leerräumen der Puffer-Speicherplätze l5 Transportbewegungen zum Quertransport 6 hin ausführen.So that the individual buffer storage locations l5 can be loaded with the cast strand sections 4b, a special transfer device is provided between the runway arranged in the region of the transverse transport 6 and in extension to the roller table 2 and the buffer storage locations l5 within the storage oven 5. This, for example, like the transverse transport 6, can be designed as a walking beam transport device. However, while the walking beam transport device of the transverse transport 6 only needs to be designed in such a way that it effects transport steps in only one transport direction, in the case of the transfer device assigned to the buffer storage locations l5, it is necessary to provide a design with which two transport directions that are opposite to one another are optionally available can be mastered. While it is necessary for the buffer storage locations l5 to be supplied with cast strand sections 4b, transport steps from the transverse transport 6 to the buffer storage locations l5 have to be carried out, the transfer device for later emptying of the buffer storage locations l5 must carry out transport movements for the transverse transport 6 run out.

Für einen optimalen Betrieb des Speicherofens 5 während der die üblichen Pausenzeiten zwischen zwei Walzzyklen überschreitenden Stillstandszeiten der nachgeordneten Anlagenteile, und zwar insbesondere der kontinuierlichen Fertigstraße 9, ist es zweckmäßig, die Anzahl der Puffer-Speicherplätze l5 im Spe icherofen 5 mindestens gleich der Anzahl der darin befindlichen Vorrats-Speicherplätze zu wählen. Im gezeigten Beispiel ist, wie aus Fig. 3 hervorgeht, die Anzahl der Puffer-Speicherplätze l5 sogar größer gewählt als diejenige der Vorrats-Speicherplätze. Es sind nämlich dort bei vier Vorrats-Speicherplätzen fünf Puffer-Speicherplätze l5 vorhanden.For optimal operation of the storage furnace 5 during the downtimes of the downstream system parts which exceed the usual break times between two rolling cycles, and in particular the continuous finishing train 9, it is advisable to make the number of buffer storage locations l5 in the storage furnace 5 at least equal to the number of them select available storage locations. In the example shown, as can be seen from FIG. 3, the number of buffer storage locations l5 is selected to be even larger than that of the storage storage locations. This is because there are five buffer storage locations l5 in the case of four storage locations.

Wenn zwischen zwei aufeinanderfolgenden Walzzyklen aus Umbau-, Wartungs- und/oder Montagegründen längere Stillstandszeiten der dem Speicherofen 5 nachgeordneten Anlagenteile in Kauf genommen werden müssen, dann besteht die Möglichkeit, gegebenenfalls die Pausenzeiten zweier Walzzyklen unmittelbar hintereinanderzusetzen, weil die währenddessen gebildeten Gußstrang-Teilstücke 4b problemlos von den Puffer-Speicherplätzen l5 des Speicherofens 5 aufgenommen werden können. Wenn dann die dem Speicherofen 5 nachgeordneten Anlagenteile wieder in Betrieb gehen, besteht ohne weiteres die Möglichkeit, auch die Walzzeiten zweier aufeinanderfolgender Walzzyklen unmittelbar hintereinander zu legen und damit kurzzeitig aufeinanderfolgend auch zwei Gußstrang-Teilstücke 4a aus dem Speicherofen 5 abzuziehen. Von den hierdurch freigewordenen beiden Vorrats-Speicherplätzen auf den Quertransport 6 kann bspw. einer unmittelbar über den Rollgang 2 von der Stranggießmaschine l aus mit einem Gußstrang-Teilstück 4a beschickt werden, während sich auf den zweiten Speicherplatz ein Gußstrang-Teilstück 4b von einem der Puffer-Speicherplätze l5 übernehmen läßt.If longer downtimes of the system components downstream of the storage furnace 5 have to be accepted between two successive rolling cycles for conversion, maintenance and / or assembly reasons, then there is the possibility of possibly placing the break times of two rolling cycles directly one after the other because the cast strand sections 4b formed in the meantime can be easily accommodated by the buffer storage locations l5 of the storage furnace 5. Then, when the parts of the plant downstream of the storage furnace 5 go back into operation, there is also the possibility of also immediately arranging the rolling times of two successive rolling cycles in succession and thus also briefly pulling off two cast strand sections 4a from the storage furnace 5. Of the two storage spaces thus freed up on the transverse transport 6, for example, one can be fed with a cast strand section 4a directly via the roller table 2 from the continuous casting machine 1, while a cast strand section 4b from one of the buffers is located in the second storage location - Storage locations l5 can be taken over.

Falls während der Stillstandszeit der dem Speicherofen 5 nachgeordneten Anlagenteile mehr als ein Gußstrang-Teilstück 4b von den Puffer-Speicherplätzen l5 übernommen worden ist, ist es ohne weiteres auch möglich, mehr als zwei Walzzyklen unter Verkürzung ihrer Pausenzeiten kurz hintereinanderzuschalten, um dadurch innerhalb des Speicherofens 5 die Puffer-Speicherplätze l5 vorsorglich wieder freizumachen.If more than one cast strand section 4b has been taken over from the buffer storage locations l5 during the downtime of the system parts downstream of the storage furnace 5, it is also easily possible to connect more than two rolling cycles in succession, shortening their pause times, in order to thereby within the storage furnace 5 as a precautionary measure to clear the buffer storage locations l5.

Werden bspw. die Pausenzeiten zweier aufeinanderfolgender Walzzyklen, welche normalerweise l0 Minten betragen, jeweils durch Einschaltung einer weiteren Walzzeit von 2,5 Minuten unterbrochen, dann lassen sich bei Einhaltung von auf 3,75 Minuten verkürzten Pausenzeiten zusätzlich zwei Gußstrang-Teilstücke 4a bzw. 4b auswalzen und damit von den Puffer-Speicherplätzen l5 auf die Vorrats-Speicherplätze des Quertransportes 6 im Speicherofen 5 übernehmen.If, for example, the pause times of two successive rolling cycles, which are normally 10 minutes, are each interrupted by switching on a further rolling time of 2.5 minutes, then two cast strand sections 4a and 4b can be made if the pause times are shortened to 3.75 minutes roll out and take over from the buffer storage locations l5 to the storage locations of the transverse transport 6 in the storage furnace 5.

Es liegt auf der Hand, daß die vorstehend beschriebene Anlage zum Herstellen von warmgewalztem Stahlband l2 aus bandförmig stranggegossenem Vormaterial 4 eine optimale Anpassung des Walzwerks-Anlagenteils 9 an die Produktion der kontinuierlich arbeitenden Stranggießmaschine l gewährleistet und dabei zugleich auch die Fertigung eines qualitativ hochwertigen Endproduktes sicherstellt. Die in den Fig.4 bis 6 dargestellt Anlage unterscheidet sich von derjenigen nach den Fig. l bis 3 im Grunde genommen nur dadurch, daß dem Speicherofen 5 anstelle einer kontinuierlich arbeitenden Fertigstraße 9 mit Quarto-Walzgerüsten ein mit Reversierbetrieb arbeitendes Quarto-Walzgerüst l7 zugeordnet ist, das als Steckel-Walzwerk mit einem auslaufseitigen Bundhaspel bzw. Haspelofen l8 und einem einlaufseitigen Bundhaspel bzw. Haspelofen l9 zusammenarbeitet.It is obvious that the system described above for the production of hot-rolled steel strip l2 from strip-shaped continuous material 4 ensures an optimal adaptation of the rolling mill system part 9 to the production of the continuously operating continuous casting machine 1 and at the same time ensures the production of a high-quality end product . The system shown in FIGS. 4 to 6 differs from that according to FIGS. 1 to 3 basically only in that the storage furnace 5 is assigned a four-high rolling mill l7 operating with a reversing operation instead of a continuously working finishing train 9 with four-high mill stands which works as a Steckel rolling mill with a coil reel or reel furnace l8 on the outlet side and a coil reel or reel furnace l9 on the inlet side.

Stranggießmaschine l und Speicherofen 5 stimmen jedoch in Aufbau und Arbeitsweise mit der Anlage nach den Fig. l bis 3 völlig überein. Continuous casting machine 1 and storage furnace 5, however, are completely identical in construction and mode of operation with the system according to FIGS. 1 to 3.

Claims (13)

1. Verfahren zum Herstellen von warmgewalztem Stahlband aus bereits bandförmig stranggegossenem Vormaterial, bei welchem von dem nach dem Gießen erstarrten Gußstrang zunächst Teilstücke gleicher Länge abgetrennt werden, dann diese Teilstücke nacheinander in einen Ofen geführt und in diesem gespeichert sowie auf Walztemperatur gebracht und gehalten werden, und bei welchem schließlich die Gußstrang-Teilstücke nacheinander mit Walztemperatur zum Auswalzen in ein Walzwerk eingeführt werden,
dadurch gekennzeichnet,
daß die Gußstrang-Teilstücke (4a, 4b) mit gestreckter Länge in den Ofen (5) eingeführt und bis zur Walzung darin gespeichert werden (6 bzw. l5),
daß dabei bis zum Walzbeginn eine größere Anzahl von Gußstrang-Teilstücken (4a) vorproduziert und gespeichert wird (6),
und daß das Stranggießen (l) auch während des Walzbetriebes (9) kontinuierlich fortgesetzt wird sowie die dabei gebildeten Gußstrang-Teilstücke (4a) in den Ofen (5) eingeführt und darin wiederum bis zur Walzung (9) gespeichert werden.1. A process for the production of hot-rolled steel strip from an already strip-shaped primary material, in which sections of the same length are first separated from the cast strand that has solidified after casting, then these sections are successively passed into an oven and stored therein, and brought to the rolling temperature and kept, and in which finally the cast strand sections are successively introduced at a rolling temperature into a rolling mill for rolling,
characterized by
that the cast strand sections (4a, 4b) are inserted into the furnace (5) with an elongated length and stored therein until they are rolled (6 or 15),
that a large number of cast strand sections (4a) are pre-produced and stored (6) until the start of rolling,
and that the continuous casting (l) is continued continuously even during the rolling operation (9) and the cast strand sections (4a) formed in this way are introduced into the furnace (5) and stored in turn until they are rolled (9). 2. Verfahren nach Anspruch l,
dadurch gekennzeichnet,
daß die Gußstrang-Teilstücke (4a, 4b) von ihrer Auslauftemperatur aus der Gießmaschine (etwa ll50°C) auf Walztemperatur (etwa l050°C) gebracht werden und dazu ihre Verweilzeit im Ofen (5) auf ein ganzzahliges Vielfaches (50 Minuten) der Gießzeit (l2,5 Minuten) für ein Gußstrang-Teilstück (4a, 4b) eingestellt wird.2. The method according to claim 1,
characterized by
that the cast strand sections (4a, 4b) are brought from their outlet temperature from the casting machine (about 1150 ° C) to the rolling temperature (about 1050 ° C) and their residence time in the furnace (5) to an integer multiple (50 minutes) Casting time (l2.5 minutes) for a cast strand section (4a, 4b) is set. 3. Verfahren nach einem der Ansprüche l und 2,
dadurch gekennzeichnet,
daß der Walzzyklus (l2,5 Minuten) für ein einzelnes Gußstrang-Teilstück (4a, 4b) zeitlich auf den Gießzyklus (l2,5 Minuten) für ein solches Gußstrang-Teilstück (4a, 4b) abgestimmt und dabei jeder Walzzyklus von einer relativ kurzen Walzzeit (2,5 Minuten) und einer relativ langen Pausenzeit (l0 Minuten) bestimmt wird.3. The method according to any one of claims l and 2,
characterized by
that the rolling cycle (l2.5 minutes) for a single cast strand section (4a, 4b) is timed to the casting cycle (l2.5 minutes) for such a cast strand section (4a, 4b) and each rolling cycle is of a relatively short length Rolling time (2.5 minutes) and a relatively long pause time (l0 minutes) is determined. 4. Verfahren nach einem der Ansprüche l bis 3,
dadurch gekennzeichnet,
daß Montagezeiten am Walzwerk (9 bzw. l7), bspw. Walzenwechsel, in Pausenzeiten (l0 Minuten) der Walzzyklen (l2,5 Minuten) gelegt und dabei gegebenenfalls die Pausenzeiten (je l0 Minuten) zweier Walzzyklen (je l2,5 Minuten) unmittelbar hintereinandergesetzt werden,
und daß währenddessen gebildete Gußstrang-Teilstücke (4b) zusätzlich in den Ofen (5) eingeführt und darin gespeichert werden (l5).4. The method according to any one of claims 1 to 3,
characterized by
that assembly times on the rolling mill (9 or l7), e.g. roll change, are placed in pause times (l0 minutes) of the rolling cycles (l2.5 minutes) and, if necessary, the pause times (l0 minutes each) of two rolling cycles (l2.5 minutes each) are placed one behind the other,
and that cast strand sections (4b) formed in the meantime are additionally introduced into the furnace (5) and stored therein (l5). 5. Anlage zur Durchführung des Verfahrens nach einem der Ansprüche l bis 4, bestehend aus einer Strannggießanlage zum kontinuierlichen Gießen eines bandförmigen Gußstranges, aus einer Querteilvorrichtung zum Unterteilen des erstarrten Gußstranges in Gußstrang-Teilstücke und einem Temperaturausgleichs- und Speicherofen für die Gußstrang-Teilstücke sowie einem diesem nachgeordneten Walzwerk, wobei der Speicherofen eine Mehrzahl von durch einen Quertransport bedienbare Speicherplätze für Gußstrang-Teilstücke enthält,
dadurch gekennzeichnet,
daß der Speicherofen (5) mit seinem Quertransport (6) für die Aufnahme von GußStrang-Teilstücken (4a, 4b) in gestreckter Länge eingerichtet ist.5. Plant for performing the method according to one of claims 1 to 4, consisting of a continuous casting system for the continuous casting of a strip-shaped cast strand, from a cross-dividing device for dividing the solidified cast strand into cast strand sections and a temperature compensation and storage furnace for the cast strand sections as well a rolling mill arranged downstream of this, the storage furnace containing a plurality of storage locations for cast strand sections that can be operated by a transverse transport,
characterized by
that the storage furnace (5) with its transverse transport (6) for receiving cast strand sections (4a, 4b) is arranged in an elongated length. 6. Vorrichtung nach Anspruch 5,
dadurch gekennzeichnet,
daß der Speicherofen (5) eine größere Anzahl von jeweils nacheinander beschickbaren Vorrats-Speicherplätzen (6) für Gußstrang-Teilstücke (4a) enthält, welche auf die Differenz ihrer notwendigen Verweilzeit (50 Minuten) im Ofen (5) zur Gießzeit (l2,5 Minuten) für ein einzelenes Gußstrang-Teilstück (4a) abgestimmt ist.6. The device according to claim 5,
characterized by
that the storage furnace (5) contains a larger number of storage spaces (6) for cast strand sections (4a) which can be loaded one after the other and which, based on the difference between their required dwell time (50 minutes) in the furnace (5) and the casting time (l2.5 Minutes) for a single cast strand section (4a). 7. Vorrichtung nach Anspruch 5 oder 6,
dadurch gekennzeichnet,
daß der Speicherofen (5) außer den Vorrats-Speicherplätzen (6) für Strangguß-Teilstücke (4a) noch Puffer-Speicherplätze (l5) für Strangguß-Teilstücke (4b) enthält (Fig. 3 und 6).7. The device according to claim 5 or 6,
characterized by
that the storage furnace (5) contains, in addition to the storage locations (6) for continuous cast sections (4a), buffer storage locations (l5) for continuous cast sections (4b) (FIGS. 3 and 6). 8. Vorrichtung nach einem der Ansprüche 5 bis 7,
dadurch gekennzeichnet,
daß im Speicherofen (5) die Vorrats-Speicherplätze (6) im wesentlichen horizontal nebeneinander liegen, während die Puffer-Speicherplätze (l5) in Höhenrichtung übereinander angeordnet sowie seitlich von den Vorrats-Speicherplätzen (6) positioniert sind (Fig. 3 und 6).8. Device according to one of claims 5 to 7,
characterized by
that in the storage furnace (5) the storage locations (6) are essentially horizontally next to each other, while the buffer storage locations (l5) are arranged one above the other in the vertical direction and are positioned laterally from the storage locations (6) (FIGS. 3 and 6) . 9. Vorrichtung nach einem der Ansprüche 5 bis 8,
dadurch gekennzeichnet,
daß die Puffer-Speicherplätze (l5) innerhalb des Speicherofens (5) einzelen nacheinander auf die Transportebene (2) der Gußstrang-Teilstücke (4a und 4b) sowie der Vorrats-Speicherplätze (6) einstellbar sind (l6; Fig. 3 und 6).9. Device according to one of claims 5 to 8,
characterized by
that the buffer storage locations (l5) within the storage furnace (5) can be set individually one after the other on the transport level (2) of the cast strand sections (4a and 4b) and the storage storage locations (6) (l6; FIGS. 3 and 6) . l0. Vorrichtung nach einem der Ansprüche 5 bis 9,
dadurch gekennzeichnet,
daß im Speicherofen (5) die Anzahl der Puffer-Speicherplätze (l5) mindestens gleich der Anzahl der Vorrats-Speicherplätze (6) vorgesehen ist (Fig. 3 und 6).l0. Device according to one of claims 5 to 9,
characterized by
that the number of buffer storage locations (l5) in the storage oven (5) is at least equal to the number of storage locations (6) (FIGS. 3 and 6). 11. Vorrichtung nach einem der Ansprüche 5 bis l0,
dadurch gekennzeichnet,
daß zwischen dem Längstransport für die einzelnen Gußstrang-Teilstücke (4a und 4b) sowie dem Quertransport der Vorrats-Speicherplätze (6) und den Puffer-Speicherplätzen (l5) eine Übergabevorrichtung für einzelne Gußstrang-Teilstücke (4b) vorgesehen ist.11. The device according to one of claims 5 to 10,
characterized,
that a transfer device for individual cast strand sections (4b) is provided between the longitudinal transport for the individual cast strand sections (4a and 4b) and the transverse transport of the storage locations (6) and the buffer storage locations (l5). 12. Vorrichtung nach einem der Ansprüche 5 bis ll,
dadurch gekennzeichnet,
daß das dem Speicherofen (5) nachgeordnete Walzwerk eine kontinuierliche Fertigstraße (9) ist (Fig. l und 2).12. The device according to one of claims 5 to 11,
characterized,
that the rolling mill downstream of the storage furnace (5) is a continuous finishing train (9) (FIGS. 1 and 2). 13. Vorrichtung nach einem der Ansprüche 5 bis ll,
dadurch gekennzeichnet,
daß das dem Speicherofen (5) nachgeordnete Walzwerk als Reversiergerüst (l7), insbesondere als Steckel-Walzwerk mit auslaufseitigen und einlaufseitigen Bundhaspeln (l8 und l9) bzw. Haspelöfen ausgelegt ist (Fig. 4 und 5).13. The device according to one of claims 5 to 11,
characterized by
that the rolling mill downstream of the storage furnace (5) is designed as a reversing stand (l7), in particular as a Steckel rolling mill with coil reels on the outlet and inlet sides (l8 and l9) or reel furnaces (FIGS. 4 and 5).
EP86114160A 1986-09-29 1986-10-13 Production of hot-rolled steel strip from continuously cast slabs Expired EP0264459B1 (en)

Priority Applications (18)

Application Number Priority Date Filing Date Title
ES86114160T ES2010653B3 (en) 1986-10-13 1986-10-13 MANUFACTURE OF A CAST GRINDING STEEL BELT
DE8686114160T DE3665680D1 (en) 1986-10-13 1986-10-13 Production of hot-rolled steel strip from continuously cast slabs
EP86114160A EP0264459B1 (en) 1986-10-13 1986-10-13 Production of hot-rolled steel strip from continuously cast slabs
AT86114160T ATE46463T1 (en) 1986-10-13 1986-10-13 PRODUCTION OF HOT ROLLED STEEL STRIP FROM CONTINUOUS CASTING SLABS.
IN693/MAS/87A IN170196B (en) 1986-10-13 1987-09-23
SU874203392A RU1801056C (en) 1986-10-13 1987-09-28 Method and equipment for making hot-rolled steel strip
ZA877351A ZA877351B (en) 1986-09-29 1987-09-29 Method and arrangement for producing hot rolled stgroup transfer polymerization catalyzed by mercury compounds eel band
US07/103,529 US4829656A (en) 1986-10-13 1987-09-30 Process for making hot-rolled steel strip
DD87307512A DD262375A5 (en) 1986-10-13 1987-10-01 METHOD AND DEVICE FOR PRODUCING HOT-ROLLED STEEL STRIP
CA000549432A CA1318578C (en) 1986-10-13 1987-10-05 Process and apparatus for making hot-rolled steel strip
MX008737A MX169996B (en) 1986-10-13 1987-10-07 PROCEDURE AND DEVICE FOR THE MANUFACTURE OF HOT ROLLED STEEL TAPE
BR8705427A BR8705427A (en) 1986-10-13 1987-10-09 PROCESS FOR THE MANUFACTURE OF HOT-LAMINATED STEEL BELT AND EQUIPMENT FOR CARRYING OUT THE PROCESS
JP62257045A JP2664379B2 (en) 1986-10-13 1987-10-12 Method and apparatus for producing hot-rolled steel strip
KR1019870011252A KR940007167B1 (en) 1986-10-13 1987-10-12 Process for making hot-rolled steel strip and apparatus therefor
CN87106902A CN1023451C (en) 1986-10-13 1987-10-13 Method and apparatus for manufacturing hot-rolled steel band
GR89400225T GR3000205T3 (en) 1986-10-13 1989-11-02 Production of hot-rolled steel strip from continuously cast slabs
LV930744A LV5599A3 (en) 1986-10-13 1993-06-29 Hot-rolled steel strip manufacturing method and its fitting device
LTRP1015A LT2522B (en) 1986-10-13 1993-09-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86114160A EP0264459B1 (en) 1986-10-13 1986-10-13 Production of hot-rolled steel strip from continuously cast slabs

Publications (2)

Publication Number Publication Date
EP0264459A1 true EP0264459A1 (en) 1988-04-27
EP0264459B1 EP0264459B1 (en) 1989-09-20

Family

ID=8195492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114160A Expired EP0264459B1 (en) 1986-09-29 1986-10-13 Production of hot-rolled steel strip from continuously cast slabs

Country Status (15)

Country Link
US (1) US4829656A (en)
EP (1) EP0264459B1 (en)
JP (1) JP2664379B2 (en)
KR (1) KR940007167B1 (en)
CN (1) CN1023451C (en)
AT (1) ATE46463T1 (en)
BR (1) BR8705427A (en)
CA (1) CA1318578C (en)
DD (1) DD262375A5 (en)
DE (1) DE3665680D1 (en)
ES (1) ES2010653B3 (en)
GR (1) GR3000205T3 (en)
IN (1) IN170196B (en)
MX (1) MX169996B (en)
RU (1) RU1801056C (en)

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DE3830027A1 (en) * 1988-09-03 1990-03-15 Didier Eng OVEN PLANT FOR WARMING OR REHEATING OF TAPE-WARM PRODUCTS
EP0359977A2 (en) * 1988-09-21 1990-03-28 DIDIER ENGINEERING GmbH Heat treating furnace for a bloom casting installation
EP0493360A1 (en) * 1990-12-20 1992-07-01 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. A continuous slab caster arrangement followed by a rolling mill
EP0499851A1 (en) * 1991-02-19 1992-08-26 DANIELI & C. OFFICINE MECCANICHE S.p.A. Tunnel system for a hot strip rolling mill linked to the continuous casting of thin slabs
DE4203985A1 (en) * 1992-02-12 1993-08-19 Eko Stahl Ag Improving surface quality of hot rolled steel strip - by removing slag, scale and copper@ from surface of cast thin slab, which is then hot rolled to strip
EP0610028A2 (en) * 1993-01-29 1994-08-10 Hitachi, Ltd. Method and apparatus for continuous casting and hot-rolling
EP0682770A1 (en) * 1993-02-03 1995-11-22 Bricmont, Inc. Heating furnace system and method for producing hot rolled workpieces
EP0726101A1 (en) * 1995-01-11 1996-08-14 Tippins Incorporated Intermediate thickness and multiple furnace process line with slab storage and slab sequencing
EP0853987A2 (en) * 1993-02-16 1998-07-22 VOEST-ALPINE Industrieanlagenbau GmbH Plant for the production of a strip, a pre-strip or a stab
AT404803B (en) * 1993-10-20 1999-03-25 Andritz Patentverwaltung METHOD FOR PROCESSING MOLDED METAL PRODUCTS
WO2007090455A1 (en) * 2006-02-08 2007-08-16 Sms Demag Ag Roller hearth furnace for heating and/or temperature equalisation of steel or steel alloy continuous cast products and arrangement thereof before a hot strip final rolling mill

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DE3837642A1 (en) * 1988-11-05 1990-05-17 Schloemann Siemag Ag METHOD AND DEVICE FOR PRODUCING HOT-ROLLED STEEL TAPES
FR2654653B1 (en) * 1989-11-22 1994-09-16 Stein Heurtey STORAGE ENCLOSURE FOR METALLURGICAL PRODUCTS.
FR2655894B1 (en) * 1989-12-19 1994-05-27 Stein Heurtey DEVICE FOR STORING METALLURGICAL PRODUCTS, SUCH AS THIN SLABS.
FR2656680A1 (en) * 1989-12-28 1991-07-05 Stein Heurtey Device for storing and transferring metallurgical products
DE4017928A1 (en) * 1990-06-05 1991-12-12 Schloemann Siemag Ag METHOD AND SYSTEM FOR THE PRODUCTION OF HOT-ROLLED TAPES OR PROFILES FROM CONTINUOUSLY PRE-MATERIAL
JP3152241B2 (en) * 1990-06-12 2001-04-03 株式会社日立製作所 Hot thin plate manufacturing equipment and manufacturing method
EP0540755A4 (en) * 1991-04-17 1994-07-13 Magnitogorski Metall Kom Im V Method and installation for production of hot-rolled strip
JPH0818045B2 (en) * 1991-08-19 1996-02-28 新日本製鐵株式会社 Hot rolling method of grain-oriented electrical steel slab
US5276952A (en) * 1992-05-12 1994-01-11 Tippins Incorporated Method and apparatus for intermediate thickness slab caster and inline hot strip and plate line
US5579569A (en) * 1992-05-12 1996-12-03 Tippins Incorporated Slab container
US5430930A (en) * 1993-10-12 1995-07-11 Italimpianti Of America, Inc. Method of manufacturing hot strip
JP3063518B2 (en) * 1993-12-27 2000-07-12 株式会社日立製作所 Continuous casting device and continuous casting system
US5467519A (en) * 1994-01-10 1995-11-21 Tippins Incorporated Intermediate thickness twin slab caster and inline hot strip and plate line
US5396695A (en) * 1994-03-22 1995-03-14 Danieli & C. Officine Meccaniche Spa Method of controlling a time period between continuously cast slabs entering a rolling stand
IT1267916B1 (en) * 1994-03-31 1997-02-18 Danieli Off Mecc PROCEDURE FOR THE PRODUCTION OF BELT STARTING FROM THIN SLABS AND RELATIVE PLANT
IT1288863B1 (en) * 1996-03-15 1998-09-25 Danieli Off Mecc CONTINUOUS LAMINATION PROCESS FOR SHEETS AND / OR TAPES AND RELATED CONTINUOUS ROLLING LINE
GB2327375A (en) * 1997-07-21 1999-01-27 Kvaerner Metals Cont Casting Continuous metal manufacturing method and apparatus therefore
ES2196240T3 (en) * 1997-11-21 2003-12-16 Sms Demag Ag RE-EQUIPMENT OF HOT LAMINATING TRAINS TO LAMINATE SLIM BANDS.
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Cited By (21)

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Publication number Priority date Publication date Assignee Title
EP0309656A1 (en) * 1987-08-05 1989-04-05 DANIELI & C. OFFICINE MECCANICHE S.p.A. Roller hearth reheating furnace for continuously cast slabs
DE3830027A1 (en) * 1988-09-03 1990-03-15 Didier Eng OVEN PLANT FOR WARMING OR REHEATING OF TAPE-WARM PRODUCTS
EP0361058A1 (en) * 1988-09-03 1990-04-04 Didier Ofu Engineering Gmbh Furnace plant to heat and reheat strip
EP0359977A2 (en) * 1988-09-21 1990-03-28 DIDIER ENGINEERING GmbH Heat treating furnace for a bloom casting installation
EP0359977A3 (en) * 1988-09-21 1991-07-31 DIDIER ENGINEERING GmbH Heat treating furnace for a bloom casting installation
AT396559B (en) * 1990-12-20 1993-10-25 Voest Alpine Ind Anlagen SLAM CONTINUOUS CASTING MILL WITH SUBordinate ROLLING MILL
US5205342A (en) * 1990-12-20 1993-04-27 Voest-Alpine Industrieanlagenbau G.M.B.H. Continuous slab caster arrangement followed by a rolling mill
EP0493360A1 (en) * 1990-12-20 1992-07-01 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. A continuous slab caster arrangement followed by a rolling mill
EP0499851A1 (en) * 1991-02-19 1992-08-26 DANIELI & C. OFFICINE MECCANICHE S.p.A. Tunnel system for a hot strip rolling mill linked to the continuous casting of thin slabs
US5212856A (en) * 1991-02-19 1993-05-25 Danieli & C. Officine Meccaniche Spa Tunnel system for a hot strip rolling mill linked to the continuous casting of thin slabs
DE4203985A1 (en) * 1992-02-12 1993-08-19 Eko Stahl Ag Improving surface quality of hot rolled steel strip - by removing slag, scale and copper@ from surface of cast thin slab, which is then hot rolled to strip
EP0610028A3 (en) * 1993-01-29 1995-01-18 Hitachi Ltd Method and apparatus for continuous casting and hot-rolling.
EP0610028A2 (en) * 1993-01-29 1994-08-10 Hitachi, Ltd. Method and apparatus for continuous casting and hot-rolling
EP0682770A1 (en) * 1993-02-03 1995-11-22 Bricmont, Inc. Heating furnace system and method for producing hot rolled workpieces
EP0682770A4 (en) * 1993-02-03 1996-01-17 Bricmanage Inc Heating furnace system and method for producing hot rolled workpieces.
EP0853987A2 (en) * 1993-02-16 1998-07-22 VOEST-ALPINE Industrieanlagenbau GmbH Plant for the production of a strip, a pre-strip or a stab
EP0853987A3 (en) * 1993-02-16 1998-08-19 VOEST-ALPINE Industrieanlagenbau GmbH Plant for the production of a strip, a pre-strip or a stab
AT404803B (en) * 1993-10-20 1999-03-25 Andritz Patentverwaltung METHOD FOR PROCESSING MOLDED METAL PRODUCTS
EP0726101A1 (en) * 1995-01-11 1996-08-14 Tippins Incorporated Intermediate thickness and multiple furnace process line with slab storage and slab sequencing
WO2007090455A1 (en) * 2006-02-08 2007-08-16 Sms Demag Ag Roller hearth furnace for heating and/or temperature equalisation of steel or steel alloy continuous cast products and arrangement thereof before a hot strip final rolling mill
KR101146931B1 (en) * 2006-02-08 2012-05-22 에스엠에스 지마크 악티엔게젤샤프트 Roller hearth furnace for heating and/or temperature equalization of steel or steel alloy continuous cast products and method for using a roller hearth furnace

Also Published As

Publication number Publication date
KR880004866A (en) 1988-06-27
CN1023451C (en) 1994-01-12
DD262375A5 (en) 1988-11-30
GR3000205T3 (en) 1990-12-31
MX169996B (en) 1993-08-04
JPS63101001A (en) 1988-05-06
DE3665680D1 (en) 1989-10-26
ES2010653B3 (en) 1989-12-01
ATE46463T1 (en) 1989-10-15
CN87106902A (en) 1988-04-20
RU1801056C (en) 1993-03-07
IN170196B (en) 1992-02-22
CA1318578C (en) 1993-06-01
BR8705427A (en) 1988-05-24
KR940007167B1 (en) 1994-08-08
JP2664379B2 (en) 1997-10-15
US4829656A (en) 1989-05-16
EP0264459B1 (en) 1989-09-20

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