RU137488U1 - Continuous casting device with dynamic reduction of slab thickness - Google Patents

Continuous casting device with dynamic reduction of slab thickness Download PDF

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Publication number
RU137488U1
RU137488U1 RU2013120989/02U RU2013120989U RU137488U1 RU 137488 U1 RU137488 U1 RU 137488U1 RU 2013120989/02 U RU2013120989/02 U RU 2013120989/02U RU 2013120989 U RU2013120989 U RU 2013120989U RU 137488 U1 RU137488 U1 RU 137488U1
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RU
Russia
Prior art keywords
slab
guide
thickness
casting
installation
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RU2013120989/02U
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Russian (ru)
Inventor
Геральд ХОЕНБИХЛЕР
Йозеф ВАТЦИНГЕР
Original Assignee
Сименс Фаи Металз Текнолоджиз Гмбх
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Priority to EP10187201.8 priority Critical
Priority to EP10187201A priority patent/EP2441538A1/en
Application filed by Сименс Фаи Металз Текнолоджиз Гмбх filed Critical Сименс Фаи Металз Текнолоджиз Гмбх
Priority to PCT/EP2011/067621 priority patent/WO2012049105A1/en
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Publication of RU137488U1 publication Critical patent/RU137488U1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • B22D11/22Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/043Curved moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/124Accessories for subsequent treating or working cast stock in situ for cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/128Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282Vertical casting and curving the cast stock to the horizontal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14Plants for continuous casting
    • B22D11/142Plants for continuous casting for curved casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/46Metal-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
    • B21B1/463Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling

Abstract

1. Installation for continuous casting of a slab of steel in a casting installation, comprising a mold (2), a slab guide device (6) located after it for implementing the liquid core crimping method (LCR), comprising a series of lower guide elements (9) and placed opposite a series of upper guide elements (10), and between both series of guide elements (9, 10) a receiving stream (11) for picking up a slab (3) emerging from the mold (2), and the slab guide device (6) has a specific installation The length (L) of the slab support portion traversed by the slab (3) with the casting speed (v) and measured between the meniscus (13) of the mold bath (2) and the end (14) of the slab opposite to the mold (2) guide device (6), characterized in that the guide elements (9, 10) are made with the possibility of adjustment to reduce the thickness of the slab (3), and thereby to reduce or increase the width (12) capture in the light of the receiving stream (11), and the installation is equipped with an adjusting device (20) with a processor made with the ability to adjust the thickness (d) of the slab and, accordingly, the width (12) of light capture during the casting process and, accordingly, during the passage of the slab (3) through the slab guide device (6) to variable values, moreover, the adjusting device (20) made with the possibility of ensuring: - compliance with the following inequality conditions determined by the minimum operational coefficient (a) and maximum operational coefficient (a) between the thickness (d) of the slab, measured on the opposite to the mold (2) hundred

Description

2420-194569RU / 022
CONTINUOUS CASTING DEVICE WITH DYNAMIC REDUCTION OF SLAB THICKNESS
The technical field to which the utility model relates.
The invention relates to a method for continuously casting a steel slab in a casting installation, the thickness of the slab leaving the mold being reduced by the liquid core compression (LCR) method using a subsequent slab guiding device with the liquid slab core, the slab passing the length of the slab supporting section specific to the installation measured between the meniscus, that is, the surface of the mold bath, and the end of the slab guide device facing the opposite side of the mold wa at the casting speed according to Clause 1, the claims, as well as to a corresponding apparatus for the execution of the method according to item 13 of the claims.
Corresponding to this type of continuous casting methods for slabs and, accordingly, continuous casting plants are already known. The liquid steel slab emerging from the mold of the casting installation is guided through a slab guiding device connected directly to the mold. A slab guiding device, also called a “slab guiding corset,” includes multiple (usually three to fifteen) guiding segments, each guiding segment having one or more (usually three to ten) pairs of guiding elements, preferably in the form of support rollers for slab. The support rollers can rotate around an axis extending perpendicular to the direction of transport of the slab.
Instead of support rollers for the slab, separate guide elements made in the form of fixed parts, for example, in the form of runners, would also be possible.
Regardless of the specific embodiment of the guide elements, they are placed on both sides of the slab relative to the surfaces along its width so that the slab passes through the upper and lower series of guide elements.
More precisely, the slab is supported not only by the slab guiding device, but also by the lower end portion of the mold, as a result of which the mold should also be considered as part of the entire slab guiding device.
Solidification of the slab begins at the upper end of the (flowing) mold at the surface of the bath, on the so-called “meniscus,” the mold typically having a length of about 1 m (0.3-1.5 m).
The slab leaves the crystallizer vertically down and changes direction to horizontal. Therefore, the slab guide device has an arcuate profile with a rotation angle of substantially 90 degrees.
Each foundry has a structurally determined length L of the slab support portion, which the slab passes with casting speed v c , and which is measured between the meniscus and the end of the slab guiding device facing the opposite side from the mold.
Known CSP® plants (for the compact strip manufacturing process) for the manufacture of hot-rolled steel strip have lengths L of the slab support portion of about 9-13 m.
The length L of the slab support portion is a constant, unit-specific value, and cannot be changed by short-term modifying actions. Dismantling and replacing the last slab guide segments distant from the mold with a simple roller table (still not implemented) would normally have lasted many days.
The slab leaving the slab guiding device can subsequently be processed in any number of rolling stands to reduce the thickness and, accordingly, finish rolling.
The present utility model can find application for optimized continuous casting of slabs in well-known integrated casting and rolling plants.
In this case, the slab leaving the slab guiding device is first separated by means of a separating device into separate flat billets, or it is rolled without separation in a subsequent crimping rough rolling mill to an intermediate strip, and then, after re-heating or maintaining it hot in the heating device finally rolled in a finishing mill to a finished strip.
In a compression rolling mill (HRM, rolling mill with a high degree of reduction) of the rough rolling, the thickness of the slab is reduced, the intermediate strip formed by this is heated by the heating device before it enters the finishing rolling mill. In the finishing mill, hot rolling occurs, that is, the rolling strip during rolling has a temperature above the temperature of its recrystallization. For steel, it is a value in the range above about 750 ° C; usually, hot rolling is performed at temperatures up to 1200 ° C.
During hot rolling of steel, the metal is mainly in the austenitic state, in which iron atoms are placed in a cubic face-centered lattice. They say about rolling in the austenitic state when the temperature of both the beginning and the end of the rolling is in the austenitic region of this particular steel. The austenitic region of steel depends on the composition of the steel, but, as a rule, is above 800ºС.
The decisive parameters in the process of manufacturing a hot-rolled steel strip from combined casting and rolling plants are the casting speed at which the slab leaves the mold (and passes through the slab guiding device), as well as the mass flow rate associated with the width, or, respectively, the volumetric flow rate, which is set as the product of casting speed and the thickness of the slab, and is usually expressed in unit [mm × m / min].
The resulting steel strips, among other things, are subsequently recycled for automobiles, household items and construction.
This utility model relates to the casting of slabs and, accordingly, flat blanks of all thicknesses, and thus is applicable for the manufacture of both thin flat blanks (<80 mm), flat blanks of medium thickness, and thick flat blanks (> 150 mm).
In addition, the present utility model is applicable to both continuous and semi-continuous manufacturing of hot rolled steel strip.
Continuous manufacturing, or “endless rolling”, is said to be when the casting plant is connected to the rolling plant in such a way that the slab cast in the mold of the casting plant is sent directly to the rolling plant without separation of the finished cast part of the slab and without intermediate storage, and it is rolled there to the desired final thickness in each case. Thus, the beginning of the slab can already be rolled to a steel strip with a finished final thickness, while the foundry continues to cast the same slab, that is, even without the end of the slab (except for the meniscus in the mold). They also talk about directly related work, or the endless work of foundry and rolling plants.
In semi-continuous manufacturing, or, accordingly, "semi-endless rolling", the molded slab after casting is separated, and the separated slabs or, respectively, flat billets, without intermediate storage and cooling to ambient temperature, are sent to the rolling unit.
State of the art
Patent Document AT 401 744 discloses a device for continuous casting of a slab using compression with a liquid core.
In addition, the corresponding method and, accordingly, the installation are known, for example, from patent documents EP 0 415 987 B1, EP 1 469 954 B1, DE 10 2007 058 709 A1 and WO 2007/086088 A1. The installation of this type is the Arvedi ESP casting and rolling plant in Cremona, which is also described approximately in the following publications: authors Hohenbichler et al., “Arvedi ESP - technology and plant design” (“Arvedi ESP - technology and plant design”), Millenium Steel 2010, March 1, 2010, pages 82-88, London, and Siegl et al., “Arvedi ESP - First Tin Slab Endless Casting and Rolling Results” (“Arvedi ESP Technology — First Results of Continuous Casting and Rolling of a Thin Slab "), 5th European Rolling Conference (" 5th European Rolling Conference "), London, June 23, 2009.
As already described at first, the slab guiding device between the guiding elements and, accordingly, the slab support rollers, forms a partially curved receiving stream for picking up a freshly cast (still containing a liquid core) slab.
Thus, in this situation, by the end of the slab guiding device is meant the actively guiding surface provided for contacting the slab or, accordingly, forming the last guiding element facing the crimping mill for rough rolling, or, accordingly, the last supporting roller of the upper series of guiding elements.
As you move away from the meniscus, the slab or, accordingly, the steel strip in its original form, transported in the slab guiding device, more and more cools. That inner region of the slab, which is still liquid or, accordingly, has a pasty semi-liquid consistency, will hereinafter be referred to as a liquid sump. The “sump top” farthest from the crystallizer of the liquid sump is defined as the region of the slab located in the center of the cross section in which the temperature still largely corresponds to the solidus temperature of the steel, and then falls below this value. Therefore, the temperature of the sump top (in the geometric middle of the cross section of the slab) corresponds to the solidus temperature of this steel grade (usually between 1300 ° C and 1535 ° C).
Rolling and, consequently, even simple deformation of the diameter of a fully solidified through and correspondingly cooler cast slab requires much greater labor costs and, accordingly, energy consumption, than rolling a cast slab with a hot core core.
Already there are installations with the so-called “soft crimping”, in which hydraulically adjustable guiding elements are provided near the end of the slab guiding device, by means of which the slab shortly before it leaves the slab guiding device, in the slab section, where the cross-section of the slab in each case contains less 5% of liquid steel, or, preferably, in the center of the slab is exclusively a test-like biphasic material, in order to improve the quality of steel it is slightly compressed (maximum 5 mm, g avnym manner no more than 3 mm).
This practice has a disadvantage in that, at a predetermined slab width, the material consumption due to a reduction in thickness decreases linearly, and with a decrease in casting speed, the sump top recedes backward against the direction of movement of the slab. Both of these circumstances are accompanied by a decrease in the supply of internal energy across the slab at the end of the slab guiding device and, accordingly, at the end of the length L of the slab supporting portion.
Soft crimping devices are used only in the slab area, in which the cross section of the slab is completely pasty or solid, that is, it has practically no distinct liquid middle area. In contrast, with guide LCR segments, and also according to the present utility model, a clearly defined fluid middle region is certainly necessary.
Industrial and technical reasons that make it necessary to limit the casting speed can be, for example, problems detected by sensors in the area of the mold or slab guiding device, or in valves located in front of the mold or plugs, in particular, problems on the surface of the bath in the mold or deviations from predetermined amounts of cooling water, or deviations of the slab temperature from predefined values. Significant changes in the composition of molten steel, the consumption of casting powder or the temperature of the walls of the mold can also contribute to a decrease in casting speed.
Therefore, traditional foundry plants operate within the nominal production capacity, which is not advisable either from the production and economic point of view, or in terms of energy efficiency in the subsequent rolling process with direct feed or hot loading, or with completely continuous endless operation of the casting and rolling complex .
Utility Model Essence
In the context of increasingly stringent requirements for profitability and production, it becomes relevant to maximize the throughput of the installation and increase the heat content in the slab leaving the slab and introduced into the next rolling stands and, accordingly, in the hot-rolled steel strip.
In general terms, the production of flat steel billets and, accordingly, hot-rolled steel strip for numerous grades of steel and cooling parameters should be optimized, and the possibility of more economical production should be provided.
In order to optimally use the heat of the casting stage during the production of hot rolled strip steel, it must be ensured that the top of the sump, that is, the doughy semi-fluid core of the diameter of the slab transported in the slab guiding device, is constantly located as far from the mold as possible and as close as possible to the end of the slab guiding device, and thereby - in the case of a complex casting and rolling installation - as close as possible to the entrance to the roughing mill of the roughing mill Attack.
With such a statement of the problem, it is necessary to take into account that, depending on the material-specific solidification coefficient, chemical properties, solidification temperature, cooling parameters and the slab thickness provided in each case, the casting speed and, accordingly, the specific width of the slab guiding device the volumetric flow rate also cannot be too high, since in this case there could be a shift of the sump top outwards beyond the slab ulation device, thereby swelling and sometimes cracking of the slab.
These problems are solved using the method with the features according to Clause 1 of the patent claims, and the installation with the signs according to Clause 13 of the patent claims.
Claim 1 is directed to a method for continuously casting a slab of steel in a casting installation, the thickness of the slab leaving the mold being reduced by the liquid core (LCR) reduction method using a subsequent slab guiding device with the liquid core of the cross section of the slab, and the slab passes the installation specific the length L of the slab support portion, measured between the meniscus, that is, the surface of the mold bath, and the end of the slice facing the opposite side of the mold apple guiding device with casting speed v c .
According to a utility model, it is provided that the thickness d of the slab is dynamically controlled by means of adjustable guide elements of the slab guide device, i.e., varies during the casting process and, accordingly, during the passage of the slab through the slab guide device, repeatedly and arbitrarily often (for example, at least 2 times per cast tape casting or, respectively, at least 1 additional time during the initial process of adjusting the thickness of the slab during the casting phase, and under the phase p as a rule, understand the first 5-15 minutes of casting a tape casting, and, accordingly, the length of time so that the length of the slab support section is 0.8-2 times filled with a hot steel slab), so that between the measured on the opposite from the mold side end of the guiding device slab thickness d of the slab and the casting rate v c (as measured at the end of the slab guiding device), depending on the specific installation for the slab length L of the support portion for bole 75%, preferably for more than 90% of the operating time of the foundry installation (the duration refers to the casting of a tape casting, for example, during a shift or during the day, with a uniform load of the installation), the following, determined by the operating coefficients "a", were observed, in particular minimum operating coefficient a min and maximum operational coefficient a max , inequality conditions:
a min × (L / d 2 ) <v c <a max × (L / d 2 ).
In this case, the minimum operational coefficient a min is 2050, preferably 2400, and the maximum operational coefficient a max is 2850, preferably 2800, and they strive to maintain the operating mode closer to the maximum operational coefficient (a max ) 2850. The length L of the slab support section is set in units of [ m], slab thickness d in units [mm], and casting speed v c in units [m / min].
The values of the above units relate to a hypothetical characteristic, not to actual measurement results or to values set as necessary in specific foundry plants. It is understood that the parametric values of the inequality conditions corresponding to the utility model: a min × (L / d 2 ) <v c <a max × (L / d 2 ) can be given in any alternative units, in particular, they are actually measured on the installation values. However, in order to unambiguously determine the operational coefficients corresponding to the utility model, the involvement of basic units is inevitable.
In any case, in order to achieve technological conditions corresponding to a useful model when converting possible alternative units to units [m] for the length L of the slab support section, units [mm] for the thickness d of the slab, and units [m / min] for the casting speed v c , the above inequality conditions and, accordingly, operational coefficients are obtained.
When taking (basic) units [m] for the length L of the slab support section, units [mm] for the thickness d of the slab, and units [m / min] for the casting speed v c , after reducing the factors for operational factors “a”, unit [mm 2 / min].
Similar to the above statements, it turns out that the operational coefficients a min and a max when setting or measuring the length of the slab support section, the thickness of the slab and the casting speed in other units than [m], [mm] and [m / min], can be are given in alternative units, respectively, in the form of values nominally deviating from the values indicated according to the utility model. When converted to the proposed base units [m], [mm] and [m / min] for the length of the slab support section, the thickness of the slab and the casting speed, in any case, the operational coefficients a min = 2050 and, accordingly, 2400 , and a max = 2850 and, accordingly, 2800.
When using the inequality conditions corresponding to the utility model, in the case of technologically or qualitatively caused decreases in the casting speed, henceforth, except during the casting phase, the slab thickness can be increased without interrupting the casting process.
The dynamic reduction of the slab thickness corresponding to the utility model while maintaining the conditions corresponding to the utility model defined by the above inequalities, on the one hand, ensures high workmanship by the fact that the sump top in the slab, regardless of the maximum casting speeds, which are determined in each case by material grade, always reaches places near the end of the slab guide device, on the other hand, the throughput of the installation can be maximized.
Due to the fact that the top of the sump in the slab - with the exception of the casting phase - is always kept near the end of the slab guiding device, the heat of the casting stage is optimally used to increase the efficiency of the subsequent rolling process in a complex casting and rolling plant.
The slab emerging from the corresponding utility model of the slab guide device, namely, during a subsequent reduction in its thickness in the crimping rough rolling mill after the slab guide device, has a sufficiently hot cross-section core to be subjected to rolling with a relatively low energy consumption, in particular when the rolling process begins no later than four minutes, preferably no later than two minutes, after the solidification of the slab.
When the inequality conditions corresponding to the utility model are maintained, the sump top in the slab is in each case located in the last third farthest from the mold, preferably in the last quarter, preferably in the last fifth of the slab guiding device and, accordingly, the length L of the slab supporting portion.
Maintaining the highest possible energy content of the slab, in particular with an endless complex technological regime, is a significant advantage, which in phases of a reduced casting speed can improve throughput by up to 35% (for example, when the thickness of the slab dynamically increases from about 65-70 mm to 95 mm; the premise of which would be that the slab at the exit from the mold has a thickness of ≥95 mm).
With an endless complex technological mode, the advantage is also that the lower boundary limits of the thickness of the hot-rolled strip are not realized even at reduced casting speeds. If, in this case, the thickness of the slab did not increase, then there would be a danger that not all available rolling stands located after the device for casting the slab could be involved, which would lead to an increased final thickness of the hot-rolled strip.
Due to the variable increased thicknesses of the slab and the LCR section between 0 and maximum 40 mm, high throughput levels can also be achieved at casting speeds of 3.8-4.5 m / min, so that it is also difficult to cast steel grades (e.g. stainless steels , textured steels and steels for the hot-rolled strip used in the outer lining of automobiles) in such a casting installation for casting thin flat billets, which is designed for a casting speed> 6 m / min, can be rolled to thickness m in case of endless production less than 1.5 mm, even less than 1.2 mm, preferably up to a thickness of less than 1 mm.
For infinitely operating complex casting and rolling plants, the following is true: when using the appropriate utility model of the method, the inverse temperature profile that is optimal in energy and productivity can also be applied in a freshly hardened slab, that is, with a very hot core of the slab (over 1300 ° C) while simultaneously clearly colder outer surface (with temperature below 1150ºС, mainly below 1100ºС), optimal in energy and productivity for rolling in the first crimping mill howling rolling. This leads to reduced levels of energy consumption for rolling in the first rolling stands, as well as improved quality of the Central part, as well as the geometric shape of the manufactured steel tape product.
The advantages achievable by using the corresponding utility model of the method can be effectively used for numerous grades of steel with different target casting speeds on the same installation, and hourly or daily changes in the lengths or positions of the installation and, accordingly, the slab bearing section or, accordingly, can be avoided. components.
This significantly reduces energy consumption during the rolling of a hot-rolled steel strip, and increases the productivity of the installation of this type.
In order to further optimize the method corresponding to the utility model, special technological parameters were determined using calculations and experimental installations and simulations, which, when manufacturing a hot-rolled steel strip, allow significant progress in terms of manufacturing quality and energy efficiency (energy consumption per ton of hot-rolled strip made).
According to one preferred embodiment of the utility model, it is provided that during continuous casting of the slab, if necessary for industrial reasons, lasting for a period of time above L / v c (the base units given in Clause are valid for substituting into the expression L / v c 1 of the claims) minutes reduction rate v c casting of more than 5%, preferably more than 10% (and optionally using automated or stored in, respectively, the control device experienced yes expert assessments, or by means of model calculations, the forecast is checked whether the decrease in the casting speed will last for a certain period of time determined in each case, for example, for at least 10, 15 or 30 minutes), at the latest (2 L / v c ) minutes after a decrease in casting speed v c , measured at the end of the slab guiding device facing the opposite side of the mold, the thickness during casting increases so that (again) the inequality conditions a min (L / d 2 ) <v c <a max (L / d 2 ), namely, the technological mode with an operating coefficient of 2800.
Thus, the (control) period of time for the casting speed v c considered as a production necessity is defined as the quotient of the division, in which the length L of the slab support portion is divisible and the casting speed vc forms a divider, where L is substituted in units [m] , and v c in units of [m / min].
The above parameters for the implementation of the appropriate control actions and, accordingly, the regulation of reducing the thickness of the slab are used to ensure the most stable operation of the installation. In particular, too frequent, due to insignificant fluctuations in the technological mode, a change in the thickness of the slab and thereby “overshoot” of the installation should be prevented.
According to one additional preferred embodiment of the utility model, it is provided that the length L of the slab support portion is in the range of 9 to 30 m, preferably in the range of 11 to 23 m.
According to one additional preferred embodiment of the utility model, it is provided that the casting speed v c ranges from 3.8 to 7.2 m / min.
According to one preferred embodiment of the utility model, it is provided that the reduction in slab thickness is from 5 to 40%, preferably from 5 to 30%, particularly preferably from 5 to 25%.
In one particularly preferred embodiment of the utility model, the reduction in slab thickness is from 5 to 40 mm, preferably from 5 to 30 mm, particularly preferably from 10 to 25 mm.
According to one additional preferred embodiment of the utility model, the slab can be compressed to a slab thickness between 45 and 140 mm, preferably to a slab thickness between 75 and 115 mm.
In one preferred method of manufacturing thick flat billets, it is provided that the slab at the exit of the mold has a thickness between 180 and 450 mm, preferably between 200 and 280 mm.
According to one additional preferred embodiment of the utility model, it is provided that the dynamic adjustment of the slab thickness using the guiding elements of the slab guide device is carried out in manual mode, that is, by direct or indirect order of the production personnel authorized to control the device (usually from the control panel).
According to one additional preferred embodiment of the utility model, it is provided that the dynamic regulation of the thickness of the slab is carried out using the guiding elements of the slab guide device in automatic mode.
According to one additional preferred embodiment of the utility model, it is provided that the slab leaving the slab guiding device (i.e., discharged through the end of the slab guiding device) in a continuous production method, that is, without dividing into pieces of flat billets, is reduced in thickness by at least at least 30% per rolling pass per pass, preferably at least 50% per rolling pass.
According to one additional preferred embodiment of the utility model, it is envisaged that more than one rolling pass is planned, preferably at least three rolling passes.
According to one additional preferred embodiment of the utility model, it is provided that the light thickness of the mold channel exit channel facing the slab guide device is between 180 and 400 mm, preferably between 200 and 280 mm.
According to one additional preferred embodiment of the utility model, it is provided that the slab can be transported through the slab guiding device at a casting speed v c from 3.8 to 7.2 m / min.
According to one additional preferred embodiment of the utility model, it is provided that the thickness of the slab as a result of the change in the light grip of the slab guide device can be reduced by 5 to 40 mm, preferably 5 to 30 mm, particularly preferably 10 to 25 mm. In this case, the slab can be compressed to a slab thickness of preferably between 45 and 140 mm, particularly preferably to a slab thickness of between 75 and 115 mm.
According to one additional preferred embodiment of the utility model, it is provided that the guide elements of the slab guide device can be adjusted in manual control mode.
According to one additional preferred embodiment of the utility model, it is provided that the guiding elements of the slab guide device can be adjusted by the automated device according to the inequality conditions corresponding to the utility model above.
According to one additional preferred embodiment of the utility model, it is provided that, after the slab guide device, a rough rolling mill is arranged with at least one rough rolling mill stand, in which the slab discharged through the end of the slab guide device is in continuous production mode, that is, without dividing into pieces of flat billets, is subjected to a reduction in thickness of at least 30%, preferably at least 50%, of the rolling mill for rough rolling and, wherein the roughing mill roughing rolling preferably comprises at least three, particularly preferably exactly four rough rolling mill stand.
guide elements 9 and parallel to it or converging to it the upper series of guide elements 10.
Each guide element 9 of the lower series of guide elements is placed opposite the opposite guide element 10 of the upper series of guide elements. The guiding elements are thereby arranged in pairs on both sides of the relatively wide side of the slab 3.
Between both series of guide elements 9, 10, a receiving stream 11 is formed for catching the slab 3 leaving the mold 2, which, as a result of different distances between the opposing guide elements 9, 10, narrows at least in separate sections in the direction of transport of the slab , and thereby the thickness of the slab 3 can be reduced. The guide elements 9, 10 are made in the form of support rollers rotating on bearings.
As seen in FIG. 1, the upper and lower series of guide elements, or support rollers, 9, 10 in each case, can, in turn, be divided into (sub) series of specific support rollers with different diameters and / or center distances.
The guide elements of the upper series of guide elements 10 can be selectively adjusted in depth, or, respectively, can be approximated to the guide elements of the lower series of guide elements 9. Regulation of the guide elements of the upper series of guide elements 10 and thereby changing the capture cross section 12 in the light of the slab guide device 6 can be performed, for example, using a hydraulic actuator. One of the slab thicknesses corresponding to the desired thickness d and measured between the upper and lower guiding elements opposite to each other of the width 12 of the light catching stream 11 of the slab guiding device 6 could be reduced, for example, from 140 mm to 110 mm.
To reduce the thickness of the slab 3 can be adjusted, for example, from three to eight (pairs) of guide elements facing the mold 2 - but not necessarily adjacent to the mold 2 - the first guide segment 16 '. Alternatively, numerous consecutive guide segments 16 may also be used to reduce thickness in LCR mode, which are directly or indirectly associated with the mold.
The thickness d of the slab and, accordingly, the width 12 of the capture in the light, can be adjusted arbitrarily.
The adjustment of these guide elements 9, 10 is carried out in a direction extending substantially perpendicular to the direction of transport of the slab, both the upper guide elements 10 and the lower guide elements 9 being adjustable. As can be seen in FIG. 3, the upper guide members 10 are pivotally attached to respective support members 17, which are preferably hydraulically adjusted.
According to the utility model, the thickness d of the slab and, accordingly, the width 12 of the light are controlled dynamically, that is, during the casting process, and, accordingly, during the continuous-quasi-stationary passage of the slab 3 through the slab guide device 6. When dynamically controlling the thickness d slab it can change during the passage of the slab 3 through the slab guiding device 6 repeatedly and arbitrarily often.
The thickness d of the slab varies at least 2 times per cast tape casting or, accordingly, at least 1 additional time during the initial process of adjusting the thickness of the slab during the casting phase (= first 5-15 minutes of casting the tape casting), so that between the slab thickness d measured on the opposite end from the mold side 14 of the slab guide device 6 and the slab thickness d equally measured on the end 14 of the slab guide device 6, casting speed v c , depending on the specific To set the length L of the slab support section for more than 75% of the duration of the casting installation (the duration refers to casting a tape casting, for example, during daytime work with a uniform load of the installation), preferably for more than 90% of the duration of the operation, the following are observed: determined by the operational coefficients "a", in particular, the minimum operational coefficient a min and the maximum operational coefficient a max , inequality conditions:
a min (L / d 2 ) <v c <a max (L / d 2 ).
The minimum service factor a min is 2050, preferably 2400, and the maximum operating rate a max of 2850, preferably 2800.
In order for these inequality conditions to be valid, it is necessary to use basic units: in this case, the length L of the slab support section is specified in units [m], the thickness d of the slab in units [mm], and the casting speed v c in units [m / min]. It follows (serving as a working hypothesis) unit [mm 2 / min] for operational factors "a".
It should be pointed out that the values of the above units are related to a hypothetical characteristic, and in practice, specific units can be obtained, lengths or language, otherwise units selected or, respectively, determined by measurements or used in the calculation process.
In any case, in order to achieve technological conditions corresponding to a useful model when converting possible alternative units to units [m] for the length L of the slab support section, to units [mm] for the thickness d of the slab, and to units [m / min] for the speed v c casting, we obtain the conditions of inequality given according to the utility model and, accordingly, operational coefficients.
The above inequalities and, accordingly, the conditions according to the utility model are observed for more than 60%, preferably for more than 90% of the cast steel groups and cooling conditions.
Similarly, with technologically driven decreases in casting speed v c, the thickness d of the slab can be increased (up to a value close to the thickness at the exit of the mold) without interrupting the casting process.
The adjustable guide elements 9, 10 are preferably located in the front half facing the mold 2, preferably in the front third of the longitudinal length of the slab guide device 6 facing the mold 2.
In each case, a dynamic reduction of the slab thickness corresponding to the utility model is performed on the slab section 3, in which more than 20%, preferably more than 50% of the cross section of the slab 3 are still liquid - and this, in particular, is characteristic of LCR compression. In FIG. 4, a cross-sectional view of a slab 3 which is actually in the process of hardening is shown schematically, the central slab cross-section region 26 being still liquid, and the shaded outer cross-sectional region 28 of the slab already solidified. Between the liquid region 26 and the hardened region 28, there is an intermediate region 27 in which the slab 3 has a pasty texture, that is, it is no longer completely liquid, but also not yet completely solid.
It should be noted that with the already mentioned method of soft crimping according to the prototype, in which, near the end of the slab guiding device 6 remote from the mold, the slab 3 is slightly compressed, this compression is carried out exclusively on one section of the slab 3, in which the cross section of the slab is completely pasty or solid, that is, also no longer has a liquid region in the middle of the slab.
According to one preferred embodiment of the utility model, it is provided that during casting of the slab in case of production reasons necessary, which lasts for a period of time above (L / v c ) - that is, the (control) period of time is defined as the quotient of the division, in wherein the length L of the slab support portion is divisible and the casting speed v c forms a divider, wherein L is substituted in units [m] and v c in units [m / min] - minutes of a decrease in casting speed v c by more than 5%, preferably more than by 10%, within no more than 100 minutes, preferably within no more than 60 minutes or no more than 30 minutes, particularly preferably at the latest (2 L / v c ) minutes after a decrease in casting speed v c , as measured by the side of the end of the slab guiding device opposite from the mold, the thickness of the slab 3 during casting increases so that (again) the inequality conditions a min (L / d 2 ) <v c <a max (L / d 2 ) are met.
In practice, using the experimental data optionally stored in an automated or, respectively, control device 20, or by means of model calculations, the prediction is checked whether the decrease in the casting speed v c will continue for a substantial period of time determined in each case, for example, for at least 10, 15 or 30 minutes to ensure the most stable installation.
Dynamic adjustment of the thickness d of the slab using the guide elements 9, 10 of the slab guide device 6 can be performed manually. Then the dynamic control is preferably controlled by production personnel depending on the actual casting speed, since it changes only in individual cases. If, however, the casting speed v c is reduced or is approaching quickly / dangerously close to this lower limit according to the utility model, the production staff is notified via the output device so as to reduce the compression with the liquid core (LCR) so that the thickness d of the slab increases, and so that thereby again achieve the appropriate utility model of state or, correspondingly, the above inequality conditions, definitely or with a good approximation to the boundary conditions specified by the operational coefficients and a min and a max .
In one preferred embodiment of the dynamic reduction of the slab thickness, this function can also be transferred to the circuit indicated in FIG. 1 to an automated device 20, in particular when relatively frequent changes in thickness or speed would have occurred as usual or as needed. For this purpose, the guiding elements 9, 10 of the slab guiding device 6 are controlled by an automated device 20 corresponding to the inequality conditions corresponding to the above utility model. In relation to the automated device 20, we are talking about an adjustment device under the control of the processor. Automated device 20 is able to adjust any number of guide elements 9, 10 and guide segments 16, individually or in combination. The actions of the automated device 20 with respect to control and regulation can be performed both on the basis of the signals of technological sensors associated with it via data transmission channels, and as a result of calculations and simulations. The intellectual operation of the automated device 20, in particular, can be made possible using program logic circuits based on the experimental data specific to the installation and on the principles of “fuzzy logic”.
The casting speed v c in the installation preferably ranges from 3.8 to 7.2 m / min.
In order to use the production capacity of the installation, it would theoretically also be possible to increase or decrease the width of the slab measured across the slab thickness d using side slab guides. But since the production program, as a rule, is based on orders with strictly defined product widths, and logistic problems would arise in the manufacture of slab batches with different widths, in particular, the ownerless costs of storage, the slab width actuator is most likely unsuitable for achieving optimal throughput.
The slab 3 undergoes reduction with a reduction in thickness by 5 to 40%, preferably from 5 to 30%, particularly preferably from 5 to 25%.
According to one preferred embodiment of the utility model, the slab 3 undergoes reduction with a reduction in thickness by 5 to 40 mm, preferably from 5 to 30 mm, particularly preferably from 10 to 25 mm. Thus, in the case of reducing the thickness of the slab 3 by an amount from 15 to 30 mm, the thickness d of the slab measured at the end 14 of the slab guiding device 6 is 15 to 30 mm less than the exit of the mold facing the slab guiding device 6.
In this case, the slab 3 can be crimped to a slab thickness d of between 45 and 140 mm, preferably to a slab thickness d of between 75 and 115 mm.
In one preferred method of manufacturing thick flat billets, it is provided that the slab 3, upon exiting the mold, has a cast thickness between 180 and 450 mm, preferably between 200 and 280 mm.
According to one additional preferred embodiment of the utility model, it is provided that the slab 3 emerging from the slab guiding device 6 (i.e., discharged through the end 14 of the slab guiding device) in a continuous production mode, that is, without dividing into pieces of flat blanks, undergoes reduction in at least one rolling pass with a reduction in thickness of at least 30% per pass, preferably at least 50% per rolling pass.
However, at least three rolling passes are preferably provided.
For this purpose, the roughing mill 4 includes at least three, particularly preferably exactly four rolling stands for rough rolling 4 1 , 4 2 , 4 3 , 4 4 .
As can also be seen in FIG. 2, after the crimping mill 4 of the rough rolling, the already mentioned finishing mill 5 is placed, which includes four rolling stands 5 1 , 5 2 , 5 3 , 5 4 finishing rolling or five rolling stands 5 1 , 5 2 , 5 3 , 5 4 , 5 5 finishing rolling, by means of which the intermediate strip 3 'emerging from the rough rolling mill 4 is crimped to a finished strip 3 ”with a thickness of <1.5 mm, preferably <1.2 mm, particularly preferably <1.0 mm.
FIG. 5-9 show technological schedules, with the help of which the molding processes are clearly explained while maintaining the inequality conditions proposed according to the utility model.
The ordinates of these graphs show the casting speed v c in units [m / min], while the abscissa shows the thickness d of the slab in units [mm].
FIG. 5 describes an installation with a length of a slab support portion L = 13 m. FIG. 6 installation with the length of the slab supporting section L = 17.5 m. FIG. 7 installation with the length of the slab support section L = 21.5 m. FIG. 8 an installation with a length of a slab support portion L = 23 m, and FIG. 9 installation with the length of the slab supporting section L = 27 m
In each graph according to FIG. 5-9, four essentially hyperbolic lines 29, 30, 31 and 32 are visible, where line 29 corresponds to the operating coefficient a = 2050 used in the corresponding inequality, line 30 to the operating coefficient a = 2400, line 31 to the operating coefficient a = 2800, and line 32 operating factor a = 2850.
Thus, lines 29 and 30 correspond to technological modes according to the inequality
a min (L / d 2 ) <v c <a max (L / d 2 ).
(preferred) minimum operating factors a min whereas lines 31 and 32 correspond to technological conditions according to the (preferred) maximum operational factors a max .
For a better graphical generalization, the area located between both (first preferred) operational factors “a” 2050 (line 29) and 2850 (line 32) was provided with simple hatching at an angle of 45, while lying between both (second preferred) operational factors “a” 2400 (line 30) and 2800 (line 31) the area was equipped with additional hatching that runs across and, respectively, perpendicular to the first hatching. Thus, the region between the (second preferred) operational factors “a” 2400 (line 30) and 2800 (line 31) is represented as a checkered one and is located inside the belt bounded by lines 29 and 32.
Based on the problems already stated with respect to the position of the sump top in slab 3, it is assumed that the casting process should select the lower casting speed v c , the shorter the length L of the slab support section of this particular installation (sump top extending outward beyond the end of the 14 slab guide device 6 in the direction of transportation, would lead to expansion and, accordingly, even cracking of the slab 3).
From the graphs of FIG. 5-9 can determine the extent to which may increase the thickness d of the slab in case of the speed limit due to production needs v c casting.
In general terms, these graphs can also be used to determine the thickness d of the slab with which, for a given length L of the slab support section and casting speed v c , the installation can be operated in the range of optimal throughput.
In the context of economical operation of the installation for all lengths of the slab support section and, accordingly, in all technological schedules, one should strive for technological conditions near line 32, i.e., the topmost line in all Figs. 5-9.
It should be noted that with a choice of slab thicknesses d depending on the casting speed in the region of the uppermost line 32 (corresponding to the maximum operational coefficient a max 2850), at least for special grades of steel, the critical area for casting technology already becomes relevant. Thus, in order to guarantee that the top of the sump is not moved outside the end 14 of the slab guiding device 6 and thereby swell the slab 3, it is recommended to choose a technological mode that is slightly lower than the position shown by line 32 and, accordingly, the maximum operating coefficient a max 2850. On this basis, it is preferable technological mode near the line 31, which corresponds to the maximum operational coefficient a max 2800, and is preferably implemented also with automated control. Automated process control is performed in the best way so that no excessive deviations occur, for example, by means of one of the PI controllers (proportional-integral), which are sufficiently known to the control personnel, with a small proportional (P) component.
Purely, as an example, the use of the corresponding utility chart model according to FIG. 5-9 with reference to FIG. 5: for the situation that the installation is operated with a casting speed v c = 5 m / min, the intersection point of the horizontal line 33 corresponding to this casting speed with the corresponding preferred maximum operating coefficient a max 2800 line 31 shows that it is possible to produce slabs when reaching the optimum throughput 3 with a slab thickness of about 86 mm.
If now the need for the casting speed v c to be reduced by 1 m / min (according to Fig. 5 along the vertical line 34) to 4 m / min follows from the above industrial and technical problems, then the intersection point of the corresponding casting speed v c = 4 m / min of an additional horizontal line 35 with the corresponding preferred maximum operating coefficient a max 2800 of line 31 shows that it is possible to manufacture slabs 3 with a slab thickness of about 96 mm. Thus, due to the fact that the width 12 of the light trap 11 of the slab guide device 6 is increased by 10 mm by appropriate hydraulic adjustment of the guide elements, the installation can also be operated at a limited casting speed v c in the range of its optimal throughput: necessary for industrial reasons, limiting the casting speed v c from 5 to 4 m / min thereby leads to a width-specific volume flow rate from 5 [m / min] × 86 [mm] = 430 [mm × m / min] to 4 [ m / min] × 96 [ m] = 384 [mm × m / min]. But this is still 44 [mm × m / min], therefore, 13% more than the value 4 [m / min] × 86 [mm] = 344 [mm × m / min], which remains feasible without increasing the thickness of the slab.
In principle, according to the graphing method according to FIG. 5-9, for each casting speed v c , a non-fixed slab thickness d is obtained, but there is always an appropriate range of slab thicknesses (and vice versa) in which the casting process can be carried out expediently and accordingly by a utility model.
In FIG. 10, only by way of example, using lines 36 and 37 depicts technological modes that can be implemented using an automated device 20.
Line 36 explains the multi-position control that leads to the zigzag line.
Line 37 explains straightforward regulation in the range of casting speeds between 7 and 4.2 m / min, and, accordingly, in the range of slab thicknesses between 94.5 and 120 mm.
It should be noted that in the context of high stability of operation, the above-described changes in the thickness d of the slab are carried out only with corresponding changes in the casting speed v c (for example, when the changes in v c are more than 0.25 m / min), and not with every slight deviation of the speed v c casting from the desired casting speed in each case.

Claims (10)

1. Installation for continuous casting of a slab of steel in a casting installation, comprising a mold (2), a slab guide device (6) located after it for implementing the liquid core crimping method (LCR), comprising a series of lower guide elements (9) and placed opposite a series of upper guide elements (10), and between both series of guide elements (9, 10) a receiving stream (11) for picking up a slab (3) emerging from the mold (2), and the slab guide device (6) has a specific installation The length (L) of the slab support portion, passed by the slab (3) with the casting speed (v c ), and measured between the meniscus (13), the mold bath (2), and the end (14) facing the opposite side of the mold (2), slab guiding device (6), characterized in that the guiding elements (9, 10) are made with the possibility of adjustment to reduce the thickness of the slab (3), and thereby to reduce or increase the width (12) capture in the light of the receiving stream (11), moreover, the installation is equipped with an adjusting device (20) with a processor made with the possibility of adjusting the thickness (d) of the slab and, accordingly, the width (12) of light capture during the casting process and, accordingly, during the passage of the slab (3) through the slab guide device (6) to variable values, moreover, the adjusting device (20 ) is configured to provide:
- compliance with the following inequality conditions, determined by the minimum operating coefficient (a min ) and maximum operating coefficient (a max ), between the thickness (d) of the slab, measured on the opposite end from the mold (2) of the end (14) of the slab guiding device (6 ), and casting speed (v c ), depending on the length (L) of the slab support section, for more than 75%, preferably for more than 90% of the operation time of the casting plant:
a min (L / d 2 ) <v c <a max (L / d 2 ),
where a min is the minimum operating coefficient of 2050, preferably 2400;
a max is the maximum operational coefficient of 2850, preferably 2800;
L is the length of the slab supporting section, m;
d is the thickness of the slab, mm, and
v c - casting speed, m / min, namely, the technological mode with an operating coefficient of 2800; and
- an increase in the thickness of the slab (3) during casting, measured at the end (14) of the slab guiding device (6) facing the opposite side of the mold (2), during continuous casting of the slab in the case of a production reason that lasts for more than ( L / v c ) minutes of a decrease in casting speed (v c ) of more than 5%, preferably more than 10%, within the latest (2 L / v c ) minutes after a decrease in casting speed (v c ), subject to inequality conditions a min (L / d 2 ) <v c <a max (L / d 2 ), namely, the technological which mode with an operational coefficient of 2800.
2. Installation according to claim 1, characterized in that the length (L) of the slab support portion varies in the range from 9 to 30 m, preferably in the range from 11 to 23 m.
3. Installation according to claim 1, characterized in that the light thickness of the exit channel of the mold facing the slab guide device (6) is between 180 and 400 mm, preferably between 200 and 280 mm.
4. Installation according to claim 1, characterized in that the slab (3) is made with the possibility of transportation through the slab guide device (6) with a casting speed (v c ) from 3.8 to 7.2 m / min.
5. Installation according to claim 1, characterized in that the slab (3) is made with the possibility of reducing the thickness by changing the width (12) of capture in the light of the slab guide device (6) by a value of from 5 to 40 mm, preferably from 5 to 30 mm , particularly preferably 10 to 25 mm, the slab (3) being able to be crimped, preferably to a slab thickness (d) between 45 and 140 mm, particularly preferably to a slab thickness (d) between 75 and 115 mm.
6. Installation according to claim 1, characterized in that the guide elements (9, 10) of the slab guide device (6) are made with the possibility of manual adjustment.
7. Installation according to claim 1, characterized in that the guide elements (9, 10) of the slab guide device (6) are made with the possibility of adjustment by an automated device (20).
8. Installation according to claim 1, characterized in that after the slab guide device (6) a rough rolling mill (4) is placed with at least one rough rolling mill (4 1 ), in which the slab (3) discharged through the end ( 14) the slab guide device (6) in a continuous production mode, that is, without separation into flat billets, is configured to reduce the thickness by at least 30%, preferably at least 50%, of the rolling mill stand (4 1 ) of rough rolling moreover, the rough rolling mill (4) is made with the possibility of main scheniya preferably at least three, more preferably four roughing rolling stands (4 1, 4 2, 4 3, 4 4).
9. Installation according to claim 8, characterized in that after the rough rolling mill (4) a rolling mill (5) for finishing rolling is placed, containing four rolling stands (5 1 , 5 2 , 5 3 , 5 4 ) for finishing rolling or five rolling finishing stands (5 1 , 5 2 , 5 3 , 5 4 , 5 5 ), adapted to crimp the intermediate strip (3 ') emerging from the rough rolling mill (4) to the finished strip (3'') with a thickness <1.5 mm, preferably <1.2 mm, particularly preferably <1.0 mm.
10. Installation according to one of claims 1 to 9, characterized in that the adjustable guide elements (9, 10) are located in the front half facing the mold (2), preferably in the front third of the longitudinal length of the slab guide device facing the mold (2) (6).
Figure 00000001
RU2013120989/02U 2010-10-12 2011-10-10 Continuous casting device with dynamic reduction of slab thickness RU137488U1 (en)

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