MX2008009949A

MX2008009949A - Method and casting/rolling plant for the production of hot-rolled metallic strips, especially steel strips, having great surface quality.

Info

Publication number: MX2008009949A
Application number: MX2008009949A
Authority: MX
Inventors: Wolfgang Henning; Christian Bilgen; Tilmann Boecher; Juergen Gaydoul
Original assignee: Sms Demag Ag
Priority date: 2006-02-02
Filing date: 2006-12-22
Publication date: 2009-01-16
Also published as: KR20080106891A; EP1981660B1; JP2009525182A; CA2640751A1; EP1981660A1; RU2008135453A; TWI381894B; CN101410198B; ES2389860T3; CA2640751C; EG25282A; US20120048501A1; AU2006337463A2; AU2006337463B2; AR059290A1; ZA200805313B; BRPI0621300A2; CN101410198A; WO2007087886A1; TW200732060A

Abstract

Disclosed are a method and a casting/rolling plant for producing hot-rolled metallic, particularly steel, strips (7) having great surface quality from slabs or flat thin bars (2, 2a) that are cast in a continuous casting process, descaling being performed based on a rotary descaling process. In order to take into account parameters which are not considered in prior art in addition to rotary descaling, the hydraulically oscillated permanent mold (9) travels along several different oscillation curves (16, 17, 18) while the oscillation marks are deep-cleaned by adjusting the oscillation pattern that is determined to be optimal for each casting material.

Description

PROCEDURE AND INSTALLATION OF COLLAR LAMINATION TO MANUFACTURE A BAND OF HOT LAMINATED METAL, ESPECIALLY BAND OF STEEL MATERIAL WITH A HIGH SURFACE QUALITY FIELD OF THE INVENTION The invention relates to a method and a laminating installation for making a hot-rolled metal strip, especially a strip of steel material with a high surface quality from roughing bars or flat thin bars. castings, which peels off on its bar surface, is heated to rolling temperature and has just been rolled in a hot-strip rolling mill of several boxes with reduced web thicknesses, being freed from scale and / or laundry powder. pouring rod after leaving a bar guide, before entering a heat compensating furnace and / or after leaving a heat compensating furnace and entering the hot strip mill, on one or both surfaces of bar through several rotary nozzles, from which pressure liquid is projected with a high pressure applied repetitively in each case over a point of equal surface, and deep cleaning oscillation marks.

STATE OF THE ART A method of this type is similarly known from DE 43 28 303 0.2. However, it does not start from a cross-section of rough slabs or rough slabs, and the rotor stripping is mainly applied to rolling products and therefore does not take into account the special manufacturing process by continuous casting. In addition, the depth of decapation is not sufficient to detect, in addition to invisible scale, also every oscillation mark due to manufacturing. In addition, an undesirably high cooling of the rolling products is caused by a very high amount of water. From EP 0 586 823 Bl a peeling device for casting and rolling trains is known. In this respect, a rotating arm with nozzle is used and retention, protection and recovery plates are proposed for the removed scale and the high quantity of the projection water. From EP 0 625 383 Bl a first peeling device is known, which may be composed of a scale scrubber of the conventional construction type and a second peeling device with rotary nozzles.

EP 0 611 610 Bl discloses a rotor dehusking with a reduced consumption of water which causes a lower temperature drop of the rolling products.

OBJECT OF THE INVENTION The invention is based on the objective of including, in addition to the application of rotary peeling, parameters not considered until now that occur through continuous casting. The stated objective is solved according to the invention in combination with the generic concept mentioned at the beginning, because the continuous casting shell which is oscillated hydraulically moves in several different oscillation curves and because the deep cleaning of the oscillation marks is carried out at through the adjustment of the oscillation development determined as optimal for each casting material. The advantages are that, in addition to the peeling itself, the oscillation marks can now also be largely cleaned and thus a finishing lamination with ultra-thin finishing laminations equal to / less than 1.2 mm is favored. This means that, for example, for these measurements the finishing lamination in the austenite zone of the glass structure is possible.

In the configuration it is foreseen that the solicitation of the rotary nozzles with pressure liquid is carried out through considerably less pressure medium than what has been used up to now in the so-called shell scrubbers., with the same parameters of the casting or rolling process. In this way, pressure medium, such as for example water, can be saved with the same or better dehiding effect. According to further features it is provided that, by means of a regulated load with respect to the temperature level of the strand or rolling bar of the rotating nozzles with pressure medium, the temperature losses of the strand remain low. In this way, a reduction of the temperature losses of the slabs and thin bars takes place, to which are considerably better conditions for the hot rolling of the ultrathin finishing finishing thicknesses and an energy saving. The corresponding laminating installation, especially a compact casting laminating (CSP) installation composed of a continuous casting device for liquid metals, especially for liquid steel materials, whose continuous casting die is connected with a hydraulic oscillating drive , which are still in the bar exit direction, at least bar guide, a temperature compensation furnace, optionally an oven conveyor and a hot strip finishing mill of several boxes and coil, is thus perfected that, between the guide bar and the temperature compensation furnace or between a straightening controller and a shear and / or between the temperature compensation furnace and the hot strip finishing rolling mill, a device is arranged with rotating nozzles, from which a pressure medium is directed with a high pressure in a repetitive manner in each case to an equal surface point. In this way the described effects of the procedure can be generated. As is known in another context, several nozzles are arranged for the pressure medium in a rotor. However, it is advantageous to provide such nozzles also for other means than water of normal temperature. Another configuration provides that several rotors with nozzles arranged in the rotor circumference for the pressure medium are arranged in a row transversely to the development of the casting or rolling bar. In this way, crossbars can be replaced individually or completely. projection of the scrubbers used until now. Finally, the application of the rotor flaking in a hot strip mill with seven or more finishing rolling boxes in each case before the entry into the first finishing rolling stand is foreseen.

BRIEF DESCRIPTION OF THE FIGURES In the drawing, exemplary embodiments of the features according to the invention are represented, which will be explained in more detail below. They show: Figure 1, a compact casting installation in a perspective side view, Figure 2, a continuous casting shell which is in a compact protective housing with a hydraulic oscillating drive, Figure 3, several diagrams of different oscillation movements of the continuous casting mold and figure 4, a single rotor with nozzles arranged on the rotor circumference.

DETAILED DESCRIPTION OF THE INVENTION A casting installation 1 (Figure 1), which especially represents a CSP (Compact Steel Plant) installation, is composed of a continuous casting device 2, into which metal is cast liquid, especially liquid steel material, by means of a continuous casting 9. The continuous casting shell 9 is provided with a hydraulically oscillating drive 9a (Figure 2). A rod guide 3, a temperature compensating furnace 4, if provided, a furnace conveyor 5 and a strip finishing mill 6 in the strip exit direction 11 follow in the bar exit direction 11. hot from several boxes and, behind it, a coil 8 for winding the band 7. Between the guide bar 3 and the temperature compensation oven 4 or between the straightening controller 12 with shear 13 and / or between the oven 4 of temperature compensation and the hot strip finishing lamination train 6, a device 14 is provided with rotating nozzles 15 (FIG. 4), from which pressure means are directed (in most cases liquid, such as for example water) with a high pressure applied repetitively in each case on an equal surface point.

According to FIG. 3, the hydraulically oscillating continuous casting die 9 moves in several different oscillation curves 16, 17, 18, so that for the casting material selected in each case a development 16a, 17a, 18a occurs in each case of different oscillation. The oscillation curves 16, 17, 18 can be obtained through different races of shell, a different casting speed, different speeds of mold advance in the downward stroke (the so-called negative strip), different curve shapes (for example sinusoidal oscillations) and the like. The application of the rotary nozzles with pressure liquid 19 can be carried out with considerably less pressure medium than what has hitherto been applied in the so-called shell scrubbers, based on the identical relations, ie parameters, of the processes opposed to each other. . At the same time, the temperature losses of the casting rod 2b are kept as small as possible by a stressing of the rotating nozzles with pressure medium, with respect to the temperature level of the casting or rolling bar (2b). that must be maintained. Several nozzles 15 for the pressure medium are assembled in a rotor 20 (FIG. 4) and several rotors 20 have nozzles 15 for pressure medium fixed in the circumference 20a of the rotor and are arranged in a row 21 of nozzles transversely to the development of the casting or rolling bar 2b. Advantages are also obtained from several rows 21 of nozzles of this type, with smaller nozzle jets being possible than in the case of a single row 21 of nozzles. The rotor flaking can be applied to a hot strip milling train 6 with seven or more finishing rolling boxes 6a prior to the entry of the rolling strip into the first finishing rolling box 6a.

List of reference numbers 1 Installation CSP (Compact Steel Plant) 2 Roughing profile 2a Thin bar profile 2b Casting bar 2c Bar surface 3 Bar guide 4 Temperature compensation furnace 5 Furnace conveyor 6 Hot strip rolling mill 6a Finishing rolling box 7 Steel material strip 8 Coil 9 Continuous casting shell that is hydraulically oscillated 9a Oscillation drive 10 Oscillation curve 11 Bar exit direction 12 Straightening controller 13 Shear 14 Device with rotating nozzles 15 Rotary nozzle 16 Oscillation curve 16a Curve curve development oscillation 17 Oscillation curve 17a Development of the oscillation curve 18 Oscillation curve 18a Development of the oscillation curve 19 Pressure liquid 20 Rotor 20a Rotor circumference 21 Rotors row

Claims

CLAIMS 1. Procedure for manufacturing a strip of hot-rolled metal, especially strip (7) of steel material, with a high surface quality from roughing bars (2) or flat thin bars (2a) cast in the process continuous casting, which peels off on its bar surface (2c), is heated to rolling temperature and has just been rolled in a train (6) of hot strip lamination of several boxes with reduced band thicknesses, freeing scale and / or laundry powder the pouring bar (2a) after leaving a bar guide (3), before entering a heat compensating furnace (4) and / or after leaving an oven (4) heat compensation and entering the hot strip lamination train (6) on one or both bar surfaces (2c) through several rotating nozzles (15), from which pressure liquid (19) is projected in a manner repetitive in each case on an equal surface point with a pressure of high stress, and the oscillation marks being cleaned in a deep manner, characterized in that the hydraulically oscillating continuous casting die (9) moves in several different oscillation curves (16, 17, 18) and because the deep cleaning of the oscillation marks are made through the adjustment of the oscillation development (16a, 17a, 18a) determined as optimum for each casting material. Method according to claim 1, characterized in that the application of the rotary nozzles (15) with pressure liquid (19) is carried out by means of considerably less pressure medium than was used up to now in so-called scale scrubbers, with the same parameters of the casting or rolling process. Method according to one of claims 1 or 2, characterized in that, by means of a pressure with pressure medium of the rotating nozzles (15) regulated with respect to the temperature level of the casting or rolling bar (2b), they keep the temperature losses of the casting bar (2b) reduced. 4. Casting lamination installation (1), especially compact casting (CSP) lamination installation, composed of a continuous casting device (2) for liquid metals, especially for liquid steel materials, whose casting die (9) continuous is connected to a hydraulic oscillation drive (9a), followed by at least one bar guide (3) in the bar output direction (11), a temperature compensation furnace (4), if necessary an oven conveyor (5) and a finishing rolling mill (6) hot band of several boxes and one coil (8), characterized in that between the guide (3) of bar and the oven (4) of temperature compensation or between the controller (12) of straightening and a shear (13) and / or between the temperature compensation furnace (4) and the hot strip finishing lamination train (6), a device (14) with rotating nozzles (15) is provided, from which pressure medium is directed with a high pressure in a repetitive manner in each case on an equal surface point. Laminating laminate installation according to claim 4, characterized in that several nozzles (15) are arranged for pressure medium in a rotor (20). Casting lamination installation according to one of claims 4 or 5, characterized in that several rotors (20) are arranged with nozzles (15) for pressure medium disposed on the circumference (20a) of the rotor in a row (21) transversely with respect to the development of the casting or rolling bar (2b). Rolling mill installation according to one of Claims 4 to 6, characterized by the application of rotor flaking in a hot strip milling train (6) with seven or more finishing rolling boxes (6a) before enter the first box (6a) of finishing lamination.