US20070051152A1 - Device for heating a metal strip, and apparatuses equipped with a device of this type, for producing hot-rolled metal strip - Google Patents
Device for heating a metal strip, and apparatuses equipped with a device of this type, for producing hot-rolled metal strip Download PDFInfo
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- US20070051152A1 US20070051152A1 US10/556,743 US55674304A US2007051152A1 US 20070051152 A1 US20070051152 A1 US 20070051152A1 US 55674304 A US55674304 A US 55674304A US 2007051152 A1 US2007051152 A1 US 2007051152A1
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- Prior art keywords
- metal strip
- strip
- hot
- heating
- rolling
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Classifications
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- 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
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- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
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- 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
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- 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
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the invention relates to a device for heating a metal strip and to apparatuses, equipped with a device of this type, for producing hot-rolled metal strip.
- a particularly critical drop in temperature occurs during what is known as Steckel rolling, as during reversing the respective strip end is not jointly heated in the coilbox.
- the procedural flexibility is crucially dependent on the possibility of a purposeful adjustability of the strip temperature in order to produce a required product mix, including different process parameters (casting rate, degree of deformation, etc), resulting from the need for different steel qualities or strip thicknesses.
- a further problem in the production of hot-rolled metal strips consists in the fact that a non-uniform temperature distribution occurs over the cross section of the stock to be hot-rolled. This inhomogeneity may lead, on the one hand, to unflat or askew strips, owing to locally varying flow properties, and, on the other hand, to a non-uniform structure formation. In principle, a non-ideal initial thickness profile (inconstancies) may also cause the above-mentioned unflat or askew strips during hot-rolling, despite the uniform temperature distribution over the strip cross section.
- the advantage of using an induction furnace for heating or warming the stock to be rolled consists in the fact that the rolling stock may be heated to a relatively precisely predeterminable temperature in a short application time.
- induction furnaces that had, in the past, been provided for this purpose did not yield results that satisfied the increasingly stringent requirements.
- the space available in the entry region of the hot-rolling stand was frequently insufficient for fitting a conventional furnace.
- the overall size of conventional continuous furnaces means that there has to be a considerable distance between the outlet of the furnace and the entry region of the hot-rolling stand, so the strip leaving the furnace is again exposed to cooling on its path to the rolling stand.
- Step rolling stands such as are disclosed, for example, in DE 195 81 737 T1
- the strip which is hot-rolled to a specific thickness, is reeled between each rolling step in a furnace, in which it is then maintained at a high temperature, which is optimal for carrying out the following rolling pass.
- the object of the invention was to provide a device for heating a metal strip, which device allows the metal strip to be heated precisely and rapidly to a predetermined temperature, while taking up little space.
- Apparatuses of the above-described type that are intended for producing hot-rolled metal strip, with which apparatuses, despite the small overall space available, optimal heating, in terms of the hot-rolling process, of the rolling stock may be carried out, were also to be specified. This includes the compensation of problems during hot-rolling resulting from the thickness profile, which problems may result in unflat or askew strips.
- a device of this type is equipped, according to the invention, with an inductively operating heating devices, each of which comprises an inductor inducing an electromagnetic field, which inductor extends over the conveying path of the metal strip to be heated and the position of which is adjustable transversely to the conveying path depending on of the width of the metal strip.
- the invention provides at least one heating device, which carries an inductor.
- This inductor extends, in each case, in the transverse direction over the transportation path, through which the rolling stock to be heated passes. During its transportation, the rolling stock therefore passes through the electromagnetic field generated by the inductor, which field causes a concentrated heating of the rolling stock.
- the inductor of the heating device is adjustable transversely to the conveying direction of the metal strip to be heated. This transverse adjustability allows the position of the inductor to be optimally adapted, in each case, to the course and the width of the metal strip.
- the invention therefore provides a transverse field heating device that allows concentrated heating of a metal strip to a desired temperature within very short application times, while taking up as little space as is conceivable.
- the device according to the invention is particularly suitable for heating steel strips that are hot-rolled immediately after the reheating process.
- a device according to the invention may therefore be arranged in immediate proximity to a rolling stand, so the temperature losses between the heating process and the hot-rolling process are reduced to a minimum.
- a particular advantage of the invention consists in the fact that the precise adjustability of the temperature characteristic allows, as a result of the adjustment of a specific temperature profile over the width of the strip to the rolled, equally specific deformation properties to be adjusted during the rolling process.
- the predetermined temperature characteristic thus allows unflat strips, directional stability and other geometrical defects of the strip to be minimised, without requiring expensive additional measures or devices.
- a configuration of the invention that has in practice proven particularly advantageous is characterised in that it is equipped with at least two inductively operating heating devices arranged in pairs.
- the heating devices each carry an inductor.
- a paired arrangement of this type allows increased quantities of heat to be introduced into the rolling stock.
- the transverse field generated by said inductors may be configured in such a way that it always reliably encompasses the entire width of the strip to be heated.
- the inductors carry metal sheets, which influence the orientation and extent of the electromagnetic field generated by the inductors.
- the transverse field may, for example, if required be configured in such a way that a desired overheating occurs in the region of the strip edges.
- the metal sheets may also be oriented in such a way that a higher temperature is generated in the region of the strip centre than in the edge regions. It is not necessary to change the metal sheets for each application; rather, the intensity with which the field, which is influenced by the metal sheets, acts on the stock to be heated may in turn be varied by means of a transverse adjustment of the inductors.
- a particularly practical configuration of the invention is characterised in that it comprises at least four heating devices. These four heating devices may be arranged in pairs opposing one another in such a way that the heating devices are arranged in alternation laterally of one side and of the other side of the conveying path in the conveying direction of the metal strip. In the case of this arrangement of the heating devices, a particularly uniform effect of the transverse fields induced by the inductors on the stock to be heated is achieved.
- a first heating device is positioned laterally of one side, two heating devices are positioned laterally of the other side, and the fourth heating device is positioned laterally of the side of the transportation path with which the first heating device is associated.
- Heating devices comprise a respective converter and in that the converters of all of the heating devices are in forced synchronisation.
- the surface of rolls on which the metal strip passes, for example, on its route through the device according to the invention may in this way be protected from damage. This protection may be additionally improved by means of suitable insulation measures, as a result of which an undesired current flow is prevented.
- a further fundamental point for the effect of the device according to the invention is the configuration of the respectively used inductors or the heat conductors thereof. It has thus proven beneficial in practical tests if, in a plan view of the conveying path, the inductors exhibit an elongate, rectangular shape.
- the heat conductors thereof may be arranged in such a way that they cover a large surface extending parallel to the transportation path of the metal strip.
- the inductors of the heating devices used according to the invention comprise a respective heat conductor, which comprises a first longitudinal portion, which, starting from a connection portion, extends along the outside of one longitudinal side of the respective inductor, a second longitudinal portion, which extends along the outside of the other longitudinal side, a third longitudinal portion, which extends along the inside of the first longitudinal portion, a fourth longitudinal portion, which extends along the inside of the second longitudinal portion and is connected to a second connection portion, a first short portion, which externally connects the end of the first longitudinal portion that is remote from the connection portion to the end of the second longitudinal portion that opposes this end, a second short portion, which connects the other end of the second longitudinal portion to the end of the third longitudinal portion that opposes it, and a third short portion, which internally connects the other end of the third longitudinal portion to the end of the fourth longitudinal portion that opposes it.
- connection portions and the second short portion should preferably be arranged parallel to one another. It has also proven beneficial if the first and the third short portions are curved in their configuration, so an optimal effect of the electromagnetic field generated is also achieved in the region of the free end of the heat conductor formed by the relevant portions.
- the device according to the invention is particularly suitable for heating cast strip, which, after the casting process, is hot-rolled to its final thickness in a hot-rolling stand.
- the abovementioned object is therefore achieved in that it comprises a device for casting a molten metal to form a cast metal strip, a device for hot-rolling the cast metal strip and a device, which is arranged between the device for casting and the device for hot-rolling and is configured according to the invention, for reheating the cast strip prior to the hot-rolling process.
- the device according to the invention may also be used in an apparatus for hot-rolling, carried out in a reversing manner, of a metal strip, which apparatus is equipped with a reversing rolling stand and with at least one device configured according to the invention, which device is arranged on one of the entry/exit sides of the reversing rolling stand and by which the stock to be hot-rolled is reheated prior to a rolling pass.
- FIG. 1 is a schematic side view of an apparatus for producing hot-rolled steel strip from cast strip
- FIG. 2 is a schematic plan view of a device, used in the apparatus shown in FIG. 1 , for heating the cast strip;
- FIG. 3 is a schematic plan view of an alternative configuration of the device, used in the apparatus shown in FIG. 1 , for heating the cast strip;
- FIG. 4 is a diagram showing, for various operating tests, the temperature profile determined, in each case, in the cast strip prior to entry into the hot-rolling stand of the apparatus.
- the apparatus 1 for producing hot-rolled steel strip 2 from cast strip 3 comprises, in succession in the conveying direction F of the cast strip 3 , a casting device 4 for casting a molten metal 5 to form the cast strip 3 , a rolling unit 6 for guiding the cast strip 3 , a device 7 for reheating the cast strip 3 , a rolling stand 8 for hot-rolling the cast strip 3 to form the steel strip 2 , and a roller table 9 , via which the steel strip 2 passes to a reeling device (not shown).
- the casting device 4 is constructed in the manner of a conventional double roller known from the prior art.
- the rolling unit 6 and the rolling stand 8 are also configured in a manner known per se.
- the device 7 for heating the cast strip 3 which is conveyed to the rolling stand 8 , is equipped with four heating devices 10 , 11 , 12 , 13 of substantially identical construction.
- Each of the heating devices 10 , 11 , 12 , 13 comprises an inductor 14 , 15 , 16 , 17 , which has a rectangular, elongate basic shape and extends, in its longitudinal orientation, transversely above the upper side of the conveying path 18 via which the strip 3 is conveyed.
- a corresponding inductor 14 a , 15 a , 16 a , 17 a extends, in each case, in an identical manner transversely to the lower side of the conveying path 18 , so the strip 2 passes, in each case, through a coupling gap K formed between the inductors 14 , 14 a , 15 , 15 a , 16 , 16 a , 17 , 17 a.
- the inductors 14 to 17 a are each equipped with a heat conductor 19 , the course and arrangement of which are selected in such a way that an electromagnetic transverse field, which is optimised with respect to its effect on the strip 3 to be heated passing under the inductors 14 to 17 a , is generated.
- the heat conductors 19 each have a first longitudinal portion 19 b , which, starting from a connection portion 19 a , extends along the outside of one longitudinal side L 1 of the respective inductor 14 to 17 a , a second longitudinal portion 19 c , which extends along the outside of the other longitudinal side L 2 of the inductor 14 to 17 a , a third longitudinal portion 19 d , which extends along the inside of the first longitudinal portion 19 b , and a fourth longitudinal portion 19 f , which extends along the inside of the second longitudinal portion 19 c and is connected to a second connection portion 19 e .
- the end of the first longitudinal portion 19 b that is remote from the connection portion 19 a is connected to the end of the second longitudinal portion 19 c that opposes this end by means of a first short portion 19 g , which is externally arranged and outwardly curved, while the other end of the second longitudinal portion 19 c is connected to the end of the third longitudinal portion 19 d that opposes it by means of a second, straight short portion 19 h .
- the other end of the third longitudinal portion 19 d is internally connected to the end of the fourth longitudinal portion 19 f that opposes it by means of a third short portion 19 i , which is guided in a curved manner in a curvature extending parallel to the curvature of the first short portion 19 g .
- the connection portions 19 a , 19 e and the second short portion 19 h are arranged parallel to one another.
- the individual portions of the respective heat conductors 19 are jointly arranged in a plane extending parallel to the conveying path 18 .
- the coil end of the inductors 14 to 17 a which is arranged in the region of the housing of the respective heating device 10 to 13 , comprises metal sheets (not shown), by means of which the field generated by the inductors 14 to 17 a is controlled in such a way that optimal heating, in terms of the particular features of the respectively treated steel material, of the edges 3 a , 3 b of the cast strip 3 is achieved.
- the inductors 14 , 14 a , 15 , 15 a , 16 , 16 a , 17 , 17 a of each heating device 10 to 13 are carried, in each case, by the piston of an actuating cylinder 20 , which, as illustrated for the heating device 10 by means of broken lines, is arranged in the housing of the heating devices 10 , 11 , 12 , 13 .
- the actuating cylinders 20 perform, in each case, independently of one another a linear actuating movement, directed transversely to the conveying path 18 , by means of which movement the position of the inductor pairs 14 , 14 a , 15 , 15 a , 16 , 16 a and 17 , 17 a , respectively associated with said cylinders, of the heating devices 10 to 13 is adjusted above the conveying path 18 .
- the conveying path 18 is formed by rolls 21 , which are electrically insulated with respect to their environment or are made of a non-conductive material, in order to prevent undesirable current flows resulting from the electromagnetic fields generated by the inductors 14 to 17 a.
- the inductors 14 to 17 a are supplied with electricity in a manner known per se by means of medium voltage generators, transformers and medium frequency converters (not shown), which are accommodated, in each case, in the housings of the heating devices 10 to 13 , which housings are oriented, with respect to the longitudinal orientation of said inductors, transversely to the conveying path 18 .
- the converters are in forced synchronisation, so the occurrence of fields of travelling waves and excessively elevated field strengths is prevented.
- the heating devices 10 , 11 , 12 , 13 of the device 7 are arranged in alternation laterally of one side 18 a and the other side 18 b of the conveying path 18 in the conveying direction F, so a symmetrical configuration and effect, with respect to the strip 3 to be heated, of the individual fields generated by the inductors 14 to 17 a are achieved.
- the first heating device 10 is arranged laterally of one side 18 a
- the second and the third heating devices 11 and 12 are arranged, in each case, laterally of the other side 18 b
- the fourth heating device 13 is, in turn, arranged laterally of the side 18 a , laterally of which the first heating device 10 is also positioned.
- Tests have revealed that as a result of this asymmetrical distribution, with respect to the conveying path 18 , of the heating devices 10 to 13 , a homogeneous temperature distribution in the respective strip 3 to be heated may be achieved in cases in which the configuration of the heating devices 10 to 13 shown in FIGS. 1 and 2 does not yield satisfactory results.
- the position of the inductors 14 to 17 a is adapted to the width B of the respective strip 3 to be heated. It is thus ensured that as the strip 3 passes through the device 7 , the strip 3 is heated to the optimal temperature for the hot-rolling process that is subsequently carried out in the rolling stand 8 , a temperature distribution that is as uniform as possible thus being achieved.
- the inductors 14 to 17 a are accordingly oriented in such a way that their coil ends protrude beyond the strip edge 3 a or 3 b respectively associated with said inductors. If, on the other hand, a lower temperature is purposefully to be achieved in the region of the strip edges 3 a , 3 b than in the region of the strip centre, the inductors 14 to 17 a are oriented in such a way that their coil ends are set back with respect to the respective strip edge 3 a or 3 b.
- the cast strip 3 which is produced in the casting device 4 , issues in the vertical direction from the casting gap in the casting device 5 and is then diverted in a horizontal direction in an arc, is guided onto the conveying path 18 by the rolling unit and then passes through the device 7 , in which it is reheated to the required hot-rolling starting temperature.
- the strip 3 enters the rolling stand 8 , in which it is hot-rolled to the final thickness of the obtained steel strip 2 , at this temperature.
- the strip temperature transverse profile in the entry and exit regions of the device 7 By combining an on-line measurement value logging of the strip thickness profile in the entry region of the device 7 , the strip temperature transverse profile in the entry and exit regions of the device 7 , the strip flatness in the exit region of the rolling stand 8 , and the strip position in the entry region of the device 7 , it is possible from the outset to prevent unflat or askew strips, and this is of fundamental importance specifically in the case of the direct strip casting method.
- the corresponding control variable alterations are undertaken in a process-dependent manner by means of a corresponding automation apparatus, by modifying and adapting the parameters within the strip delivery line steering driver, device, hot-rolling stand 8 .
- FIG. 4 shows the characteristic of the absolute temperature t A in ° C. over the width b, specified in “mm”, of the strip 3 .
- the coil ends of the inductor pair 15 , 15 a were arranged at a distance of 100 mm, 80 mm, 70 mm, 60 mm, 50 mm or 30 mm (“ ⁇ ”) from the respectively associated edge of the strip 3 .
- the temperature characteristic in the strip 3 may be adjusted in such a way that starting from a high temperature in the strip centre, for example, a significant drop in temperature in the direction of the relevant strip edge occurs.
- Different rolling forces are accordingly exerted over the width of the strip during the hot-rolling process, allowing irregularities in the shape of the strip that exist before said strip enters the rolling stand 8 to be compensated during the hot-rolling process.
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Abstract
Description
- The invention relates to a device for heating a metal strip and to apparatuses, equipped with a device of this type, for producing hot-rolled metal strip.
- In the production of hot-rolled metal strips, there is frequently the problem that the temperature of the stock to be hot-rolled decreases so markedly, prior to the respective hot-rolling passes to be carried out, that the hot-rolling may no longer take place. This problem occurs, in particular, during the treatment of steel, which, below a specific minimum temperature, may not be hot-rolled at all, or may not be hot-rolled with the desired degree of success.
- A particularly critical drop in temperature occurs during what is known as Steckel rolling, as during reversing the respective strip end is not jointly heated in the coilbox. But also in the case of direct strip casting with subsequent hot-rolling, the procedural flexibility (scope of application) is crucially dependent on the possibility of a purposeful adjustability of the strip temperature in order to produce a required product mix, including different process parameters (casting rate, degree of deformation, etc), resulting from the need for different steel qualities or strip thicknesses.
- A further problem in the production of hot-rolled metal strips consists in the fact that a non-uniform temperature distribution occurs over the cross section of the stock to be hot-rolled. This inhomogeneity may lead, on the one hand, to unflat or askew strips, owing to locally varying flow properties, and, on the other hand, to a non-uniform structure formation. In principle, a non-ideal initial thickness profile (inconstancies) may also cause the above-mentioned unflat or askew strips during hot-rolling, despite the uniform temperature distribution over the strip cross section. This problem is particularly significant if the hot-rolling process is carried out on an initial strip having a thickness of <10 mm, and spreading of the stock is accordingly no longer possible, or is possible only to an insufficient degree. During hot-rolling of directly cast strip, in particular, where irregularities in the thermal camber of the casting roll and intermittent infiltrations in the lateral seals cannot be ruled out, a temperature level differing locally from the remaining temperature profile should therefore be adjustable “on-line”, in order to assist process stability (flat or straight strips).
- The article “Bandgieβtechnik—eine Revolution in der Stahlindustrie?” by Claus Hendricks, Stahl und Eisen 115 (1995), No. 3, pages 75 to 81, contains an overview of the above-mentioned rolling processes and the equipment used in the carrying-out of said processes. In the conventional production of hot strip from slabs, the rolling stock accordingly passes prior to the hot-rolling process through a furnace, in which it is brought to the necessary hot-rolling starting temperature. In the production of hot strip from thin slabs, which are supplied to the hot-rolling in a continuous production sequence following the casting of the melt, the thin slabs, before entering the rolling train, pass through a compensation furnace in order to render the temperature distribution over the slab cross section as uniform as possible. Finally, it is known from the field of the in-line production of hot strip from cast strip to guide the cast strip through a conventionally configured induction furnace, before it is rolled to its final thickness in a hot-rolling stand.
- The advantage of using an induction furnace for heating or warming the stock to be rolled consists in the fact that the rolling stock may be heated to a relatively precisely predeterminable temperature in a short application time. However, in practical implementation, it was found that even induction furnaces that had, in the past, been provided for this purpose did not yield results that satisfied the increasingly stringent requirements. In the case of the known induction furnaces, it was thus not easily possible to control the temperature distribution in the strip in such a way that the respectively desired temperature profile was reliably achieved. It was also found that the space available in the entry region of the hot-rolling stand was frequently insufficient for fitting a conventional furnace. Moreover, the overall size of conventional continuous furnaces means that there has to be a considerable distance between the outlet of the furnace and the entry region of the hot-rolling stand, so the strip leaving the furnace is again exposed to cooling on its path to the rolling stand.
- What are known as “Steckel rolling stands”, such as are disclosed, for example, in DE 195 81 737 T1, are another application in which the overall size of the furnaces used for reheating a rolled product has proven problematic. In the case of rolling stands of this type, which operate in reversing mode, the strip, which is hot-rolled to a specific thickness, is reeled between each rolling step in a furnace, in which it is then maintained at a high temperature, which is optimal for carrying out the following rolling pass.
- Starting from the above-described prior art, the object of the invention was to provide a device for heating a metal strip, which device allows the metal strip to be heated precisely and rapidly to a predetermined temperature, while taking up little space. Apparatuses of the above-described type that are intended for producing hot-rolled metal strip, with which apparatuses, despite the small overall space available, optimal heating, in terms of the hot-rolling process, of the rolling stock may be carried out, were also to be specified. This includes the compensation of problems during hot-rolling resulting from the thickness profile, which problems may result in unflat or askew strips.
- With respect to the device for heating a metal strip, this object is achieved in that a device of this type is equipped, according to the invention, with an inductively operating heating devices, each of which comprises an inductor inducing an electromagnetic field, which inductor extends over the conveying path of the metal strip to be heated and the position of which is adjustable transversely to the conveying path depending on of the width of the metal strip.
- The invention provides at least one heating device, which carries an inductor. This inductor extends, in each case, in the transverse direction over the transportation path, through which the rolling stock to be heated passes. During its transportation, the rolling stock therefore passes through the electromagnetic field generated by the inductor, which field causes a concentrated heating of the rolling stock. At the same time, in the case of a device according to the invention, the inductor of the heating device is adjustable transversely to the conveying direction of the metal strip to be heated. This transverse adjustability allows the position of the inductor to be optimally adapted, in each case, to the course and the width of the metal strip. The invention therefore provides a transverse field heating device that allows concentrated heating of a metal strip to a desired temperature within very short application times, while taking up as little space as is conceivable.
- As a result of the small dimensions required for its assembly and its operation, the device according to the invention is particularly suitable for heating steel strips that are hot-rolled immediately after the reheating process. A device according to the invention may therefore be arranged in immediate proximity to a rolling stand, so the temperature losses between the heating process and the hot-rolling process are reduced to a minimum.
- A particular advantage of the invention consists in the fact that the precise adjustability of the temperature characteristic allows, as a result of the adjustment of a specific temperature profile over the width of the strip to the rolled, equally specific deformation properties to be adjusted during the rolling process. The predetermined temperature characteristic thus allows unflat strips, directional stability and other geometrical defects of the strip to be minimised, without requiring expensive additional measures or devices.
- A configuration of the invention that has in practice proven particularly advantageous is characterised in that it is equipped with at least two inductively operating heating devices arranged in pairs. The heating devices each carry an inductor. On the one hand, a paired arrangement of this type allows increased quantities of heat to be introduced into the rolling stock. At the same time, as a result of a corresponding adjustment of the inductors, the transverse field generated by said inductors may be configured in such a way that it always reliably encompasses the entire width of the strip to be heated.
- This may be brought about particularly effectively in that one heating device is arranged laterally of one side of the conveying path and the other heating device is arranged laterally of the other side of the conveying path. This arrangement ensures, even in the case of particularly wide metal sheets, that the inductors cover the total width of the strip, so homogeneous warming of the metal strip may easily be ensured. Practical tests have thus revealed that as a result of the transverse adjustability according to the invention of the inductors, a temperature profile, which exhibits a uniform characteristic over the total width and thickness, including the strip edge regions, may be produced in the respectively heated metal strip.
- In addition to the orientation of the inductors, a further possibility for adjusting the temperature profile produced in the heated strip consists in the fact that the inductors carry metal sheets, which influence the orientation and extent of the electromagnetic field generated by the inductors. As a result of a corresponding arrangement of the metal sheets, the transverse field may, for example, if required be configured in such a way that a desired overheating occurs in the region of the strip edges. The metal sheets may also be oriented in such a way that a higher temperature is generated in the region of the strip centre than in the edge regions. It is not necessary to change the metal sheets for each application; rather, the intensity with which the field, which is influenced by the metal sheets, acts on the stock to be heated may in turn be varied by means of a transverse adjustment of the inductors.
- A particularly practical configuration of the invention is characterised in that it comprises at least four heating devices. These four heating devices may be arranged in pairs opposing one another in such a way that the heating devices are arranged in alternation laterally of one side and of the other side of the conveying path in the conveying direction of the metal strip. In the case of this arrangement of the heating devices, a particularly uniform effect of the transverse fields induced by the inductors on the stock to be heated is achieved. If, however, it should emerge that uniform heating of the metal strip may not be achieved, this problem may be solved, according to an alternative configuration, in that, in succession in the conveying direction of the metal strip, a first heating device is positioned laterally of one side, two heating devices are positioned laterally of the other side, and the fourth heating device is positioned laterally of the side of the transportation path with which the first heating device is associated.
- Current markings on the surface of apparatus components that are exposed to the electromagnetic transverse field generated by the heating devices may be prevented in that the heating devices comprise a respective converter and in that the converters of all of the heating devices are in forced synchronisation. The surface of rolls on which the metal strip passes, for example, on its route through the device according to the invention may in this way be protected from damage. This protection may be additionally improved by means of suitable insulation measures, as a result of which an undesired current flow is prevented.
- A further fundamental point for the effect of the device according to the invention is the configuration of the respectively used inductors or the heat conductors thereof. It has thus proven beneficial in practical tests if, in a plan view of the conveying path, the inductors exhibit an elongate, rectangular shape. In the case of this configuration of the inductors, the heat conductors thereof may be arranged in such a way that they cover a large surface extending parallel to the transportation path of the metal strip. Theoretical calculations and practical tests have also revealed, in this connection, that particularly good results may be achieved if the inductors of the heating devices used according to the invention comprise a respective heat conductor, which comprises a first longitudinal portion, which, starting from a connection portion, extends along the outside of one longitudinal side of the respective inductor, a second longitudinal portion, which extends along the outside of the other longitudinal side, a third longitudinal portion, which extends along the inside of the first longitudinal portion, a fourth longitudinal portion, which extends along the inside of the second longitudinal portion and is connected to a second connection portion, a first short portion, which externally connects the end of the first longitudinal portion that is remote from the connection portion to the end of the second longitudinal portion that opposes this end, a second short portion, which connects the other end of the second longitudinal portion to the end of the third longitudinal portion that opposes it, and a third short portion, which internally connects the other end of the third longitudinal portion to the end of the fourth longitudinal portion that opposes it. In order to complete the planar arrangement of the heat conductors, the connection portions and the second short portion should preferably be arranged parallel to one another. It has also proven beneficial if the first and the third short portions are curved in their configuration, so an optimal effect of the electromagnetic field generated is also achieved in the region of the free end of the heat conductor formed by the relevant portions.
- As a result of its capacity to generate a precisely predeterminable temperature distribution in the strip and owing to its compactness, the device according to the invention is particularly suitable for heating cast strip, which, after the casting process, is hot-rolled to its final thickness in a hot-rolling stand. With respect to an apparatus for producing hot-rolled metal strip, the abovementioned object is therefore achieved in that it comprises a device for casting a molten metal to form a cast metal strip, a device for hot-rolling the cast metal strip and a device, which is arranged between the device for casting and the device for hot-rolling and is configured according to the invention, for reheating the cast strip prior to the hot-rolling process.
- Alternatively, the device according to the invention may also be used in an apparatus for hot-rolling, carried out in a reversing manner, of a metal strip, which apparatus is equipped with a reversing rolling stand and with at least one device configured according to the invention, which device is arranged on one of the entry/exit sides of the reversing rolling stand and by which the stock to be hot-rolled is reheated prior to a rolling pass.
- In addition to the heat deformation properties themselves, adherence to a defined temperature is at the same time also of fundamental importance to the configuration of the structure, and therefore the material properties of the hot strip as a finished product or input stock for further processing. It may therefore be beneficial, in the case of narrowly predetermined tolerance limits for the coil temperature, to undertake in the manner according to the invention an additional inductive heating process between the rolling stand and coiler.
- The invention will be described below in greater detail with reference a drawing illustrating embodiments. In the drawing:
-
FIG. 1 is a schematic side view of an apparatus for producing hot-rolled steel strip from cast strip; -
FIG. 2 is a schematic plan view of a device, used in the apparatus shown inFIG. 1 , for heating the cast strip; -
FIG. 3 is a schematic plan view of an alternative configuration of the device, used in the apparatus shown inFIG. 1 , for heating the cast strip; and -
FIG. 4 is a diagram showing, for various operating tests, the temperature profile determined, in each case, in the cast strip prior to entry into the hot-rolling stand of the apparatus. - The
apparatus 1 for producing hot-rolledsteel strip 2 fromcast strip 3 comprises, in succession in the conveying direction F of thecast strip 3, acasting device 4 for casting amolten metal 5 to form thecast strip 3, a rollingunit 6 for guiding thecast strip 3, adevice 7 for reheating thecast strip 3, a rollingstand 8 for hot-rolling thecast strip 3 to form thesteel strip 2, and a roller table 9, via which thesteel strip 2 passes to a reeling device (not shown). Thecasting device 4 is constructed in the manner of a conventional double roller known from the prior art. The rollingunit 6 and the rollingstand 8 are also configured in a manner known per se. - The
device 7 for heating thecast strip 3, which is conveyed to the rollingstand 8, is equipped with fourheating devices heating devices inductor path 18 via which thestrip 3 is conveyed. A correspondinginductor path 18, so thestrip 2 passes, in each case, through a coupling gap K formed between theinductors - The
inductors 14 to 17 a are each equipped with aheat conductor 19, the course and arrangement of which are selected in such a way that an electromagnetic transverse field, which is optimised with respect to its effect on thestrip 3 to be heated passing under theinductors 14 to 17 a, is generated. For this purpose, theheat conductors 19 each have a firstlongitudinal portion 19 b, which, starting from aconnection portion 19 a, extends along the outside of one longitudinal side L1 of therespective inductor 14 to 17 a, a secondlongitudinal portion 19 c, which extends along the outside of the other longitudinal side L2 of theinductor 14 to 17 a, a thirdlongitudinal portion 19 d, which extends along the inside of the firstlongitudinal portion 19 b, and a fourthlongitudinal portion 19 f, which extends along the inside of the secondlongitudinal portion 19 c and is connected to asecond connection portion 19 e. The end of the firstlongitudinal portion 19 b that is remote from theconnection portion 19 a is connected to the end of the secondlongitudinal portion 19 c that opposes this end by means of a first short portion 19 g, which is externally arranged and outwardly curved, while the other end of the secondlongitudinal portion 19 c is connected to the end of the thirdlongitudinal portion 19 d that opposes it by means of a second, straightshort portion 19 h. Finally, the other end of the thirdlongitudinal portion 19 d is internally connected to the end of the fourthlongitudinal portion 19 f that opposes it by means of a thirdshort portion 19 i, which is guided in a curved manner in a curvature extending parallel to the curvature of the first short portion 19 g. Theconnection portions short portion 19 h are arranged parallel to one another. The individual portions of therespective heat conductors 19 are jointly arranged in a plane extending parallel to the conveyingpath 18. - The coil end of the
inductors 14 to 17 a, which is arranged in the region of the housing of therespective heating device 10 to 13, comprises metal sheets (not shown), by means of which the field generated by theinductors 14 to 17 a is controlled in such a way that optimal heating, in terms of the particular features of the respectively treated steel material, of theedges cast strip 3 is achieved. - The
inductors heating device 10 to 13 are carried, in each case, by the piston of anactuating cylinder 20, which, as illustrated for theheating device 10 by means of broken lines, is arranged in the housing of theheating devices cylinders 20 perform, in each case, independently of one another a linear actuating movement, directed transversely to the conveyingpath 18, by means of which movement the position of the inductor pairs 14, 14 a, 15, 15 a, 16, 16 a and 17, 17 a, respectively associated with said cylinders, of theheating devices 10 to 13 is adjusted above the conveyingpath 18. - The conveying
path 18 is formed byrolls 21, which are electrically insulated with respect to their environment or are made of a non-conductive material, in order to prevent undesirable current flows resulting from the electromagnetic fields generated by theinductors 14 to 17 a. - The
inductors 14 to 17 a are supplied with electricity in a manner known per se by means of medium voltage generators, transformers and medium frequency converters (not shown), which are accommodated, in each case, in the housings of theheating devices 10 to 13, which housings are oriented, with respect to the longitudinal orientation of said inductors, transversely to the conveyingpath 18. In order to prevent current markings from occurring on therolls 21 of the conveyingpath 18, the converters are in forced synchronisation, so the occurrence of fields of travelling waves and excessively elevated field strengths is prevented. - In the case of the embodiment illustrated in
FIGS. 1 and 2 , theheating devices device 7 are arranged in alternation laterally of oneside 18 a and theother side 18 b of the conveyingpath 18 in the conveying direction F, so a symmetrical configuration and effect, with respect to thestrip 3 to be heated, of the individual fields generated by theinductors 14 to 17 a are achieved. - In the case of the alternative configuration, illustrated in
FIG. 3 , of thedevice 7, in succession in the conveying direction F, thefirst heating device 10 is arranged laterally of oneside 18 a, the second and thethird heating devices other side 18 b, and thefourth heating device 13 is, in turn, arranged laterally of theside 18 a, laterally of which thefirst heating device 10 is also positioned. Tests have revealed that as a result of this asymmetrical distribution, with respect to the conveyingpath 18, of theheating devices 10 to 13, a homogeneous temperature distribution in therespective strip 3 to be heated may be achieved in cases in which the configuration of theheating devices 10 to 13 shown inFIGS. 1 and 2 does not yield satisfactory results. - As a result of a corresponding transverse adjustment of the inductor pairs 14, 14 a, 15, 15 a, 16, 16 a, 17, 17 a, the position of the
inductors 14 to 17 a is adapted to the width B of therespective strip 3 to be heated. It is thus ensured that as thestrip 3 passes through thedevice 7, thestrip 3 is heated to the optimal temperature for the hot-rolling process that is subsequently carried out in the rollingstand 8, a temperature distribution that is as uniform as possible thus being achieved. If the strip edges 3 a, 3 b are to be overheated during this heating process, theinductors 14 to 17 a are accordingly oriented in such a way that their coil ends protrude beyond thestrip edge inductors 14 to 17 a are oriented in such a way that their coil ends are set back with respect to therespective strip edge - The
cast strip 3, which is produced in thecasting device 4, issues in the vertical direction from the casting gap in thecasting device 5 and is then diverted in a horizontal direction in an arc, is guided onto the conveyingpath 18 by the rolling unit and then passes through thedevice 7, in which it is reheated to the required hot-rolling starting temperature. Thestrip 3 enters the rollingstand 8, in which it is hot-rolled to the final thickness of the obtainedsteel strip 2, at this temperature. - As a result of the adjustability according to the invention of the
inductors 14 to 17 a transversely to the conveyingpath 18 of thestrip 3, it is possible in this operation to reheatcast strips 3, the width of which may vary in a wide range. Moreover, as a result of the transverse adjustment of theinductors 14 to 17 a, any desired temperature profiles may be produced in thestrip 3. It is thus ensured that optimal results are achieved during the hot-rolling process carried out after the reheating process. All of the actuating processes of thedevice 8 may be automated. Devices according to the invention are therefore particularly suitable for carrying out an operation that proceeds automatically. - By combining an on-line measurement value logging of the strip thickness profile in the entry region of the
device 7, the strip temperature transverse profile in the entry and exit regions of thedevice 7, the strip flatness in the exit region of the rollingstand 8, and the strip position in the entry region of thedevice 7, it is possible from the outset to prevent unflat or askew strips, and this is of fundamental importance specifically in the case of the direct strip casting method. The corresponding control variable alterations are undertaken in a process-dependent manner by means of a corresponding automation apparatus, by modifying and adapting the parameters within the strip delivery line steering driver, device, hot-rollingstand 8. - It was demonstrated on the basis of various operating tests that a temperature characteristic that results in an optimal form of the hot strip obtained after the hot-rolling process may be adjusted in the
cast strip 3 before said strip enters the rollingstand 8, by adjusting theinductors 14 to 17 a over the width of thestrip 3.FIG. 4 shows the characteristic of the absolute temperature tA in ° C. over the width b, specified in “mm”, of thestrip 3. In the tests, the coil ends of theinductor pair strip 3. It was found that by varying the distance between the coil end and the associated edge of thestrip 3, the temperature characteristic in thestrip 3 may be adjusted in such a way that starting from a high temperature in the strip centre, for example, a significant drop in temperature in the direction of the relevant strip edge occurs. Different rolling forces are accordingly exerted over the width of the strip during the hot-rolling process, allowing irregularities in the shape of the strip that exist before said strip enters the rollingstand 8 to be compensated during the hot-rolling process. -
- 1 Apparatus for producing hot-rolled
steel strip 2 - 2 Obtained hot-rolled steel strip
- 3 Cast strip
- 3 a, 3 b Edges of the
cast strip 3 - 4 Casting device
- 5 Molten metal
- 6 Rolling unit
- 7 Device for reheating the
cast strip 3 - 8 Rolling stand for hot-rolling the
cast strip 3 - 9 Roller table
- 10, 11, 12, 13 Heating devices
- 14, 15, 16, 17 Inductors extending above the conveying path
- 18
- 14 a, 15 a, 16 a, 17 a Inductors extending below the conveying path
- 18
- 18 Conveying path
- 18 a, 18 b Sides of the conveying
path 18 - 19 Heat conductor
- 19 a, 19 e Connection portions of the
heat conductor 19 - 19 b, 19 c, 19 d, 19 f Longitudinal portions of the
heat conductors 13 - 19
- 19 g, 19 h, 19 i Short portions of the
heat conductors 19 - 20 Actuating cylinder
- 21 Rolls
- B Width of the
cast strip 3 - F Conveying direction
- K Coupling gap between the inductor pairs 14, 14 a, 15,
- 15 a, 16, 16 a, 17, 17 a
- L1 L2 Longitudinal sides of the
inductors 14 to 17 a
Claims (15)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10323796A DE10323796B3 (en) | 2003-05-23 | 2003-05-23 | Apparatus for heating a metal strip and equipment equipped with such a device for producing hot-rolled metal strip |
DE10323796.8 | 2003-05-23 | ||
PCT/EP2004/005569 WO2004103595A1 (en) | 2003-05-23 | 2004-05-24 | Device for warming a metal strip and systems for producing hot-rolled metal strips, fitted with said type of device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070051152A1 true US20070051152A1 (en) | 2007-03-08 |
Family
ID=33461879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/556,743 Abandoned US20070051152A1 (en) | 2003-05-23 | 2004-05-24 | Device for heating a metal strip, and apparatuses equipped with a device of this type, for producing hot-rolled metal strip |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070051152A1 (en) |
EP (1) | EP1648628A1 (en) |
DE (1) | DE10323796B3 (en) |
WO (1) | WO2004103595A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090139681A1 (en) * | 2006-05-26 | 2009-06-04 | Jurgen Seidel | Device and Method for Producing a Metal Strip by Continuous Casting |
US20140007992A1 (en) * | 2011-01-11 | 2014-01-09 | Thyssenkrupp Steel Europe Ag | Method for Producing a Hot-Rolled Flat Steel Product |
TWI758114B (en) * | 2021-02-26 | 2022-03-11 | 中國鋼鐵股份有限公司 | System and method for heating electrical steel laminations |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011006357A1 (en) * | 2010-10-08 | 2012-04-12 | Sms Siemag Ag | Rolling mill for producing a metal strip and method for producing a rolling mill |
EP3025799B2 (en) | 2014-11-28 | 2020-04-15 | SMS group GmbH | Rolling mill |
EP3284546A1 (en) * | 2016-08-19 | 2018-02-21 | SMS Group GmbH | Method for rolling a rolling product in a rolling line and rolling line |
CN113260722A (en) | 2019-01-14 | 2021-08-13 | 首要金属科技奥地利有限责任公司 | Device for inductively heating workpieces in a rolling mill |
DE102019008622A1 (en) * | 2019-12-13 | 2021-06-17 | ABP lnduction Systems GmbH | Cross-field induction heater |
EP3941157A1 (en) | 2020-07-15 | 2022-01-19 | ABP Induction Systems GmbH | Method and system for inductively heating flat articles |
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GB1546367A (en) * | 1975-03-10 | 1979-05-23 | Electricity Council | Induction heating of strip and other elongate metal workpieces |
SE393819B (en) * | 1975-04-03 | 1977-05-23 | Uddeholms Ab | HEATING SYSTEM FOR METAL BAND |
DD119820A1 (en) * | 1975-06-04 | 1976-05-12 | ||
JPS60244418A (en) * | 1984-05-19 | 1985-12-04 | Meidensha Electric Mfg Co Ltd | Re-heating of plate-like material |
GB9503390D0 (en) * | 1995-02-21 | 1995-04-12 | Davy Mckee Poole | "Variable-width induction heater |
DE10206269A1 (en) * | 2001-07-25 | 2003-02-20 | I A S Induktions Anlagen & Ser | Device and method for inductive block heating with a block heating coil |
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2003
- 2003-05-23 DE DE10323796A patent/DE10323796B3/en not_active Expired - Fee Related
-
2004
- 2004-05-24 WO PCT/EP2004/005569 patent/WO2004103595A1/en active Application Filing
- 2004-05-24 EP EP04739323A patent/EP1648628A1/en not_active Withdrawn
- 2004-05-24 US US10/556,743 patent/US20070051152A1/en not_active Abandoned
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US4751360A (en) * | 1987-06-26 | 1988-06-14 | Ross Nicholas V | Apparatus for the continuous induction heating of metallic strip |
US5368088A (en) * | 1989-07-20 | 1994-11-29 | Nippon Steel Corporation | Apparatus of continuously casting a metal sheet |
US5308946A (en) * | 1992-02-06 | 1994-05-03 | Mohr Glenn R | Induction heating apparatus and method for heating metal strips and slabs |
US5403994A (en) * | 1994-02-14 | 1995-04-04 | Ajax Magnethermic Corporation | Selectively adjustable transverse flux heating apparatus |
US6189358B1 (en) * | 1997-05-16 | 2001-02-20 | Danieli & C. Officine Meccaniche Spa | Two stand tandem for rolling line |
US6608290B1 (en) * | 1999-03-01 | 2003-08-19 | Avesta Sheffield Aktiebolag | Method of heating metal strip and apparatus thereof |
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US20090139681A1 (en) * | 2006-05-26 | 2009-06-04 | Jurgen Seidel | Device and Method for Producing a Metal Strip by Continuous Casting |
US20140007992A1 (en) * | 2011-01-11 | 2014-01-09 | Thyssenkrupp Steel Europe Ag | Method for Producing a Hot-Rolled Flat Steel Product |
TWI758114B (en) * | 2021-02-26 | 2022-03-11 | 中國鋼鐵股份有限公司 | System and method for heating electrical steel laminations |
Also Published As
Publication number | Publication date |
---|---|
WO2004103595A1 (en) | 2004-12-02 |
EP1648628A1 (en) | 2006-04-26 |
DE10323796B3 (en) | 2005-02-10 |
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Legal Events
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Owner name: THYSSENKRUPP STEEL AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DEGENHARDT, ROLF;FIGGE, HANS JURGEN;LINDENBERG, HANS-ULRICH;AND OTHERS;REEL/FRAME:018225/0763;SIGNING DATES FROM 20060620 TO 20060701 Owner name: THYSSENKRUPP NIROSTA GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DEGENHARDT, ROLF;FIGGE, HANS JURGEN;LINDENBERG, HANS-ULRICH;AND OTHERS;REEL/FRAME:018225/0763;SIGNING DATES FROM 20060620 TO 20060701 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |