KR101514625B1 - Method for continuous austenitic rolling of a preliminary strip, which is produced in a continuous casting process, and combined casting and rolling facility for performing the method - Google Patents

Abstract

It is an object of the present invention to provide a method of forming a hot strip having a rolled thickness of 0.5 to 15 mm by performing thickness reduction steps in one or more rolling trains formed by a plurality of successive rolling stands, For subsequent continuous austenite rolling of preliminary strips produced in a continuous casting process in a continuous address facility at a casting thickness of less than 300 mm, preferably less than 150 mm, by subsequent lateral separation of the hot rolled hot strip Method. In order to reduce the investment layout while increasing the capacity, the preliminary strip 6 has the number of thickness reduction steps (n, n ₁ , n _i ) in each of the rolling trains (W, W1, W2, W3) ), And the number (n) of thickness reduction steps to be carried out is determined by the condition (I). The invention also relates to a casting and rolling facility for the method.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a continuous austenite rolling process for pre-strips produced in a continuous casting process, and a combined casting and rolling facility for carrying out such a process. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] COMBINED CASTING AND ROLLING FACILITY FOR PERFORMING THE METHOD}

The present invention relates to a continuous casting process in a continuous casting plant which comprises performing thickness reduction steps in one or more rolling trains (formed by a plurality of continuous rolling stands) By forming a hot strip and subsequently transversely separating the rolled hot strip into coil size and coil length before winding in a storage device, a casting thickness of less than 300 mm, preferably of 150 lt; RTI ID = 0.0 > mm < / RTI > to a continuous austenitic rolling process.

The present invention also has a continuous casting facility for casting steel billets having a casting thickness of less than 300 mm, preferably for casting steel billets having a thickness of less than 150 mm, Having at least one rolling train comprising a plurality of successive rolling stands to produce hot strips rolled to a rolling thickness of 0.5 to 15 mm within a temperature range and being austenitically rolled in a continuous casting and rolling process, To a combined casting and rolling facility for making hot strips.

The process according to the invention for the continuous austenite rolling of the preliminary strip produced in the continuous casting process is characterized in that the preliminary strip produced in the continuous casting plant is fed to the first rolling stand at the casting speed without a preliminary stripping step, Or into a first rolling train, wherein the feedrate means a method of considering the thickness reduction effected in each subsequent rolling train to produce a hot strip. A similarly combined casting and holding facility constitutes a structural layout such that the cast preform strip is introduced into the first rolling stand of the first rolling train at a casting speed without going through the preliminary strip separating step.

DE 38 40 812 A1 discloses a combined casting and rolling process in which the steel strip castings in a continuous casting plant are rolled in two deformation stages directly from the casting heat and at this time the casting equipment There is no separation step between downstream rolling devices. The first rolling deformation of the cast steel billet is carried out immediately after solidification in the outlet area of the continuous casting plant using a single rolling stand at a billet temperature of about 1100 ° C. The additional rolling is carried out in a multi-stand rolling train at a rolling speed depending on the casting speed of up to 5 m / min and depending on the degree of deformation achieved in the first rolling stand. In order to ensure the final rolling in the austenite range, an induction reheating of the steel strip is absolutely required between the first rolling stand and the subsequent rolling train. Intermediate heating stages are also provided between the individual rolling stands of the rolling train.

WO 92/00815 A1 discloses an additional combined casting and rolling process in which a cast steel billet produced in a continuous casting plant is subjected to two successive transformation stages in order to form a rollable product having cold- Rolled without being transversely separated in advance. The reduction of the first thickness of the cast steel billet is carried out inside the continuous casting apparatus at the time when the steel billet still has a liquid core (liquid core reduction). In addition, the second thickness reduction of the solidified steel billet is carried out in a multi-stand rolling facility at a strip temperature of about 1100 DEG C in the austenite range immediately after leaving the continuous casting apparatus. During these two straining stages, the steel strip is hot-rolled from a casting thickness of less than 100 mm to a windable hot strip of 10 to 30 mm strip thickness.

WO 97/36699 A1 discloses a process for producing hot-rolled steel strips in which cast steel billets are delivered directly to a multi-stand rolling train without a separation step and rolled to the finished product in the austenite range . Here, a specific minimum number of deformation stages is suggested to ensure austenite final rolling, when the specific volume flow rate associated with a slab width of 1.0 m is 0.487 m ² / min. As a result of such a process, the temperature of the steel strip at the end of the continuous casting installation as a result of various conditions in the casting process may no longer ensure austenite rolling at the last stand of the rolling train, It will not be corrected by homogenization before stand. Through the improvement of process technology it has been proposed to provide an additional heating or cooling unit between two or more rolling stands of the rolling train in order to set the desired temperature profile of the rolling strip. The very general content of arranging such corresponding heating and / or cooling units will not be suitable for the optimal construction of the rolling train and will not be suitable for as optimal grouping of rolling stands as possible.

EP 0 823 294 A1 discloses a process for producing rolled steel strips from low carbon and ultra low carbon steels in a continuous casting and rolling process and likewise does not carry out the separation step between the casting process and the rolling process. A cast steel strip having a solidification thickness greater than 70 mm is austenitically rolled to a strip thickness of less than 20 mm in a first transformation stage in the temperature range of 1150 ° C to 900 ° C. Accelerated cooling to a temperature range of less than 738 캜 is then carried out, followed by ferrite rolling in three or more rolling processes.

Accordingly, it is an object of the present invention to overcome the disadvantages of the known prior art and to be able to identify the maximum number of stand populations, intermediate heating elements and / or heating powers, To provide a method and apparatus for continuous austenite rolling of a preliminary strip produced in a continuous casting process with a minimum investment layout. This means, for example, the final rolling thickness and casting thickness (of the strip being wound) and the austenite limit temperature defined by the chemical analysis.

Another object of the present invention is to provide a method of producing a hot strip which is based on the expected product spectrum and in which the slab thickness should be 30 to 150 mm and the width- Is to optimize the overall equipment configuration in order to carry out the rolling process, with the condition that the temperature of the hot slab should be 4.5 t / min, preferably 3.0 to 3.6 t / min (where the typical hot slab density is 7.4 t / m ³ ).

In the method according to claim 1, this object is achieved by the fact that the thickness of the preliminary strip is reduced by the number (n _i ) of thickness reduction steps in each of the rolling trains downstream of the continuous casting installation, The number of thickness reduction steps (n _i ) to be implemented is determined by the following conditions,

Where T _{VB , i} [° C] is the average cross-sectional area at the end of the intermediate heating device installed before the i ^th rolling train (in the liquidus tip area) at the end of the casting device cross-sectionally averaged pre-strip temperature,

T _aust [° C] is the steel quality-dependent austenite formation limit temperature (austenite final rolling temperature)

h _Br [mm] is the slab / cast thickness at solidification (= liquid tip)

d _{end , i} [mm] is the strip thickness after the n _i thickness reduction steps of the i ^th rolling train,

m _vor is the number of all thickness reduction steps implemented from the slab coagulation until it is introduced into the first stand of the subsequent i ^th rolling train,

Vg [m / min] is the slab casting speed.

Using these calculation rules, in the case of a particular steel quality with input and output conditions (strip format, temperature) set, rolling in the austenite range is still possible in the last thickness reduction step or in the rolling stand of the last rolling train The number of rolling stands required or the number of required thickness reduction steps of the rolling train can be easily determined. Further, intermediate heating portions and intermediate heating powers required to achieve a certain austenitically rolled specific hot strip thickness are determined therefrom.

The term "rolling train" refers to a continuous construction of a plurality of rolling stands wherein the stand spacing of neighboring rolling stands does not exceed 5.6 m, preferably 4.9 m, and intermediate heating The stage is not disposed, or intermediate heating of the rolled strip is performed. Each rolling stand includes a pair of working rolls.

With this calculation rule it is possible to provide a means for reducing the need for rolling stands of a group of rolling stands or of a plurality of continuously aligned rolling trains when intermediate tension devices for raising the strip temperature are provided between respective rolling trains or groups of rolling stands The number of required thickness reduction steps may be additionally determined. When applying a calculation rule to a second or further rolling train downstream of a continuous casting installation, all thickness reduction steps already carried out in the first rolling train (s) are taken into account by factor _mvor , The slab thickness (h _Br ) is still considered. Even in the case of multiple rolling trains or groups of rolling stands, an appropriate maximum number of thickness reduction steps may be determined for each of these groups. In the case of the first continuous casting train immediately downstream of the continuous casting installation, m _vor = 0 because there is no step of decreasing the thickness before that.

Preferably, the number of thickness reduction steps (n) activated within the rolling train is determined by the following conditions.

.

.

This is determined by the two largest natural numbers (N) from the set of natural numbers (N) given by the mathematical condition, the number of thickness reduction steps activated within each rolling train in accordance with the product- And may be selected from these.

Accordingly, in accordance with this method rule, in existing casting and rolling facilities for continuous casting and austenite rolling of steel strips, the rolling stands to be activated in each of the rolling trains downstream of the casting equipment from the set of available rolling stands Or the optimal number of thickness reduction steps.

From the thickness reduction step to the thickness reduction step, a reduction in the pre-strip temperature averaged in cross-sectional area occurs, and such temperature should not be lower than the austenite formation limit temperature depending on the steel quality. In order to ensure that the temperature is not lowered below the austenite forming limit temperature which depends on the steel quality even in the final thickness reduction stage of the rolling train, the thickness reduction steps in one rolling train are carried out and the thickness reduction in the subsequent rolling train An intermediate heating of the rolled strip is carried out before the steps are carried out and the rolled strip temperature averaged in cross-sectional area is increased by 50 K to 450 K, preferably by 120 K to 350 K. Preferably, such intermediate heating is carried out by inductive transverse field heating. Nevertheless, depending on the intermediate strip thickness in particular, intermediate heating may also be carried out using other known methods.

Preferably, when the casting thickness (h _Br) is less than 45 mm, all the thinning steps are carried out in a single rolling train, and reduces all the required thickness in the case of more than the casting thickness (h _Br) 60 mm step Are carried out in two or more rolling trains. In the case of a casting thickness of 45 mm to 60 mm, rolling may be carried out in one rolling train or in two rolling trains, depending on various factors which may influence. For example, the rolling may be carried out preferably within one rolling train to produce a thick sheet, and may be preferably carried out in rolling trains to produce a hot strip.

In the case where the casting thickness (h _Br ) is less than 50 mm, all the thickness reducing steps are carried out in one rolling train, and if the casting thickness (h _Br ) is more than 50 mm, all necessary thickness reducing steps are carried out in two or more rolling trains Lt; / RTI >

If the casting thickness is less than 50 mm and the rolled strip thickness is more than 3.5 mm then according to the calculation rules it will generally be possible to provide one rolling train with a maximum of n rolling stands after the casting process, And subsequently cooling the strip in the cooling section, separating the strip laterally according to the specific coil weight and feeding the separated strip to the winding system. In this case, no additional significant strip heating is required.

It has been found that when setting the number of thickness reduction steps required to reach the hot strip thickness for coiling, typically two or more rolling stand groups need to be aligned if the casting thickness of the preliminary strip is 50 mm or thicker , The maximum number of rolling stands required for each group that satisfies the conditions of the calculation rule, i.e., the number of calculated reduction steps should not be exceeded, and generally should not reach that number. Intermediate heating of the preliminary strip by more than 50 K is carried out between the two groups of rolling stands, so that the preliminary strip temperature is significantly higher than the austenite formation limit temperature. In any case, in the case of an envisaged width-specific production rates of 2.5 to 4.5 t / min, preferably 3.0 to 3.6 t / min, when the final rolling thickness is less than 3.5 mm, Separation of the group will be appropriate.

The method may be advantageously used when the preliminary strip produced in the continuous casting process is produced to a casting thickness of 30 mm or more, preferably 60 mm or more. The method is particularly advantageous when it is desired to achieve a rolling thickness of 0.5 to 15 mm, preferably 0.8 to 12 mm and in particular 1.0 to 8 mm, in the case of a casting thickness of 30 to 300 mm, preferably 60 to 150 mm, It can be used to.

To implement the method, calculation rules for determining the number (n _i or n) of adjacent successive successive thickness reduction steps for each rolling train are calculated for a process computer on a process management level As a mathematical model,

Or under the following conditions:

And a corresponding activation signal for activating the individual rolling stands of one or more rolling trains is transmitted by the computer to the respective control loops of one or more rolling trains, (T _{VB , i} ), i.e. the intermediate heating end, before the rolling train, is taken into consideration together with the state information on the casting preliminary strip from the process computer of the continuous casting plant The averaged cross-sectional temperature of the preliminary strip is considered together.

The present invention also relates to a combined casting and rolling installation for the production of austenitically rolled hot strips in a continuously operated casting and rolling process wherein the combined casting and rolling installation comprises a steel billet having a casting thickness of less than 300 mm A continuous casting facility for casting steel billets, preferably with a casting thickness of less than 150 mm, to produce hot strips rolled to a rolling thickness of 0.5 to 15.0 mm within austenite temperature range, One or more rolling trains comprising rolling stands, a separating facility and a strip storage device located downstream of the last rolling stand.

The configuration of the combined casting and rolling facility would be based on a customer-tailored, intended and expected production program tailored to such hot strips for hot striping. The intent is to ensure that hot strips are continuous and rolled to have only austenite structure using a compact casting and rolling facility with wide production spectrum.

In order to achieve the object of the present invention mentioned in the introduction, each of the at least one rolling train, the population or number; wherein the rolling stands which are adjacent to a series of (number n _i), the number of such rolling stands (n _i) is The following conditions are satisfied:

Lt; / RTI >

At this time, the T _{VB, i} [℃] is averaged by the cross-sectional area at the end of the intermediate heating device in the casting device end (at the tip area of the liquid), or a previously installed i ^th second rolling train pre-strip temperature,

T _aust [° C] is the steel quality-dependent austenite formation limit temperature (austenite final rolling temperature)

h _Br [mm] is the slab / cast thickness at solidification (= liquid tip)

d _{end , i} [mm] is the strip thickness after the n _i thickness reduction step of the i ^th rolling train,

m _vor is the number of all thickness reduction steps implemented from the slab coagulation until it is introduced into the first stand of the subsequent i ^th rolling train.

Preferably, the number of thickness reduction steps (n) activated within the rolling train is determined by the following conditions:

.

This means that the number of rolling stands provided within each rolling train in accordance with the product-specific type requirements is determined by the two largest natural numbers N from the set of natural numbers N given by the mathematical conditions . By applying these conditions to the product spectrum on which the facility plan is based, the entire plant configuration can be optimized.

In order to ensure austenite rolling in each final rolling stand of each successive rolling train, in order to increase the preliminary strip temperature averaged in cross-sectional area up to a temperature (T _{VB , i} ) of a corresponding sufficient temperature level, Is provided between two successive rolling trains (W _{i -1} and W _i ). In order to achieve a maximally uniform increase of the cross-sectional averaged pre-strip temperature, an intermediate heating device is constructed as a device for induction cross field heating.

The casting installations on which the combined casting and rolling installation are based include a continuous mold or a replaceable continuous mold that can be adjusted to different casting thicknesses and a downstream billet guide having a billet segment capable of adjusting the gap. In practice, it is preferred that one rolling train with n rolling stands be activated in the case of billet guides and continuous molds with a casting thickness (h _Br ) of less than 45 mm and the casting thickness (h _Br ) It is preferred that two or more rolling trains, each comprising a certain number of rolling stands, in the case of a billet guide and a continuous mold adapted to exceed mm, are activated. When casting to a thickness of between 45 mm and 60 mm, the rolling may be carried out in one rolling train or in two rolling trains, and depending on the various influencing factors, intermediate rolling between successive rolling trains A heating device may be provided.

According to another possible configuration of the invention, in the case of a billet guide and continuous mold adapted to a casting thickness (h _Br ) of less than 50 mm, it would be desirable for only one rolling train with n rolling stands to be activated, Two or more rolling trains, each having a certain number of rolling stands, may be activated.

Depending on the desired thickness reduction in the individual rolling stands of the rolling trains and the thermal or thermodynamic state of the preliminary or intermediate strip, in order to achieve the greatest possible thickness reduction in the very high temperature of the slab or of the preliminary strip, It would be desirable for the work roll diameter of the work rolls in the first rolling train after installation to lie within a diameter range of 650 mm to 980 mm. It is preferable that the working roll diameter is in the range of 650 mm to 800 mm. The work roll diameter of the work rolls in the second rolling train after the casting plant has a range of 500 mm to 870 mm since the intermediate strip thickness has already been reduced. In this case, the preferred range of working roll diameter is between 500 mm and 720 mm. In general, the working roller diameter will also have to be reduced when the input thickness of the rolled material is reduced.

Other advantages and features of the present invention will become apparent from the following description of a non-limiting exemplary embodiment with reference to the accompanying drawings.

1 is a longitudinal cross-sectional view illustrating a combined casting and rolling facility according to the present invention in accordance with a first embodiment of the present invention.
2 is a longitudinal cross-sectional view illustrating a combined casting and rolling facility according to the present invention in accordance with a second embodiment of the present invention.
3 is a longitudinal cross-sectional view illustrating a combined casting and rolling facility according to the present invention in accordance with a third embodiment of the present invention.
4 is a diagram showing control of a casting and rolling facility combined according to the invention.

Figures 1 to 3 show several possible embodiments of a combined casting and rolling plant according to the invention, characterized in that it comprises a continuous casting plant for the continuous casting of steel billets having a thin slab or an intermediate slab cross- And a rolling train (W) for immediately austenitic rolling of the cast billet or preliminary strip, located immediately after the continuous casting installation. A prior art continuous casting installation G according to the prior art is shown as a billet guide 4 having a continuous mold 3 and a billet guide roller 5. The billet casting mold 3 with a subsequent billet guide determines the casting thickness h _Br of the preliminary strip 6 and after the transition from the essentially vertical casting direction to the horizontal conveying direction, W or alternatively to the rolling train W after first passing the homogenizer 7 and in the homogenizer 7 the operation for homogenizing the temperature distribution in the preliminary strip is carried out Lt; / RTI > The preliminary strip 6 having the casting thickness h _hBr is subjected to the preliminary strip temperature T _{VB , 1} averaged at the casting speed v _g and without cross-sectional area (without carrying out the separation step) 1 rolling stand 8a. The number of rolling stands 8a, 8b ... 8n used in the rolling train W is determined by the desired final thickness d _{end 1} and by the final rolling temperature in the rolling stand 8n , And the final rolling temperature must be higher than the austenite forming limit temperature (T _aust ) which is necessarily dependent on the steel quality. In this case, the maximum number of rolling stands (n1) that can be used for a particular steel quality with determined geometrical specification values is determined by the following general formula:

.

Here, the number of rolling stands is given as the largest natural number within the field of possible result values.

The hot-rolled strip is subsequently passed through a cooling section 9 and is laterally separated by a separating installation 10 formed by a transverse separation blade in accordance with a predetermined coil weight, 11 to form a coil.

In addition to the steel quality, the discharge billet thickness set in the continuous casting facility and the desired rolling thickness of the rolled hot strip to form the coil are required for the completion of the finished product with the requisite material and textural properties, Substantially determines the number. The preliminary strip temperature (T _{VB , 1} ) averaged in cross-sectional area at the end of the casting apparatus and before introduction into the first rolling stand will only be able to be varied within a very narrow range and depends on the operating conditions of the continuous casting apparatus something to do. The austenite formation limit temperature, which depends on the steel quality, is a material constant, which is essentially constant for each steel quality. During the rolling process, on the one hand, the deformation energy is released in the form of heat and on the other hand the heat is released to the surroundings as the preliminary strip proceeds through the rolling stand. On the whole, it is common that the preliminary strip temperature is continuously decreased, and the degree of decrease will increase proportionally as the rolling speed or the casting speed at the inlet side becomes slower. The above formula provides a thickness reduction step or an appropriate maximum number setting of the rolling stand which has to be carried out in the rolling train wherein the strip temperature is lowered below the austenite forming limit temperature in the rolling train And all the transformation steps are considered. Two or more rolling trains W1, W2, W3 need to be aligned, as in the exemplary embodiment according to FIGS. 2 and 3, in the case of rolling from a slab of thickness greater than 50 mm to a rolling thickness of less than 3.5 mm .

The combined casting and rolling facility in the embodiment according to FIG. 2 is basically consistent with the above-described embodiment according to FIG. Instead of the rolling train W according to FIG. 1, two continuous rolling trains W1 and W2 separated by an intermediate heating device 12 are provided.

The rolling train W1 includes the maximum number of rolling stands 8a, 8b, ..., 8n determined by the above-described calculation rule. Similarly, the rolling train W2 also includes the maximum number of rolling stands 13a, 13b, ..., 13m determined by the above-described calculation rule, and in this case, The number of thickness reduction steps is considered for the rolling train W2 by an exponent ( _mvor ). In the intermediate heating device 12, the preliminary strip temperature averaged in cross-sectional area is returned to a temperature level sufficiently higher than the austenite forming limit temperature of the preliminary strip having a reduced thickness in the rolling train W1, W2 may be carried out within the austenite range. The temperature increase achieved by the intermediate heating device ranges from 50 K to 450 K, preferably from 120 K to 350 K, depending on the requirements.

The combined casting and rolling installation schematically illustrated in FIG. 3 has three rolling trains W1, W2 and W3 and has a relatively thick casting thickness (for example greater than 150 mm) and a long metallurgical billet guide length, Or a very thin (e.g., less than 1.2 mm) rolled thickness austenitic rolled hot strip based on a relatively low average averaged slab temperature (T _VB ). The intermediate heating device 12 is provided between the rolling train W1 having the rolling stands 8a, 8b, ..., 8n and the rolling train W2 having the rolling stands 13a, 13b, ..., 13m And another intermediate heating device 14 is aligned between the rolling train W2 and the rolling train W3 having the rolling stands 15a, 15b, ..., 15o. The number of rolling stands required in the rolling train W3 is determined in a manner similar to the manner in which the maximum number of rolling stands in the rolling train W2 is determined. However, any variation of the stage in the rolling train (W1 and W2) will be considered in the index (m _vor) with respect to the rolling train (W ^2).

There will be a need to produce hot strips of various steel qualities and very different rolling thicknesses based on commercially available steel billets of various casting thicknesses. When the alignment of the rolling trains to the product range has already been made at the design stage for equipment production, a wide range of products can be achieved very easily on the combined casting and rolling equipment of the type according to the invention. This enables the product-specific activation of the necessary rolling stands. Typically, such a facility is designed so that the maximum slab thickness according to the developed formula, the minimum strip winding thickness, the respective intermediate strip thickness (d _{end , i} ) and the intermediate heating temperature (T _{VB , i} ) The maximum number of stands, and intermediate heating devices. Work-related temperature variations in the production of the preliminary strip in the continuous casting plant may also be achieved by corresponding control of the rolling trains, in particular by activation of an optimal rolling stand configuration. This is achieved by receiving process state information from the process computer PS of the upstream continuous casting facility and by providing a process management level to transfer the activation signal to the individual control loops PW1 and PW2 of the rolling trains W1 and W2 level; P) (see FIG. 4). In this case, special calculation rules are assigned as mathematical models to the process computer at the process operation level, where the current average or steady state width-specific mass throughput is multiplied by a factor of multiple as a multiplication factor. In this case, the number of thickness reduction steps in the individual rolling stands is set according to the following conditions,

At this time, the number of thickness reduction steps for each rolling train may be selected from the two largest natural numbers from the set of natural numbers given by the condition.

The intermediate heating device 12 is integrated into the control loop on the process operation level P. [

Claims (16)

Thinning steps in one or more rolling trains formed by a plurality of successive rolling stands to form hot strips having a rolling thickness of 0.5 to 15 mm and hot rolling to a coil size or coil length prior to winding in a storage device. A continuous austenitic rolling process for a preliminary strip produced in a continuous casting process in a continuous address facility at a casting thickness of less than 300 mm by subsequent lateral separation of the strip,
The pre-strip (6) that the thickness is reduced by a plurality of reduced thickness stage _{(n, n 1, n i} ) from the respective continuous casting plant rolling train of the downstream (W, W1, W2, W3 ), be carried out The number of thickness reduction steps (n _i )

Lt; / RTI >
In this case, T _{VB, i} [° C] is a cross-sectionalally averaged value at the end of the intermediate heating device installed in the end of the casting apparatus (in the tip region in the liquid state) or before the i ^th rolling train ) Is the preliminary strip temperature,
T _aust [° C] is the steel quality-dependent austenite formation limit temperature (austenite final rolling temperature)
h _Br [mm] is the slab / cast thickness at solidification (= liquid tip)
d _{end, i} [mm] is the strip thickness after the n _i thickness reduction steps of the i ^th rolling train,
m _vor is the number of all thickness reduction steps implemented from the slab coagulation until it is introduced into the first stand of the subsequent i ^th rolling train,
Vg [m / min] is the slab casting speed
A method for continuous austenite rolling of a preliminary strip.
The method according to claim 1,
(N) of the thickness reduction activated within the rolling train satisfy the following condition

≪ / RTI >
A method for continuous austenite rolling of a preliminary strip.
The method according to claim 1,
The intermediate heating of the rolling strip is carried out after the thickness reduction steps in the rolling train W1 or W2 are carried out and before the thickness reduction steps in the subsequent rolling train W2 or W3 are carried out, Characterized in that the temperature is increased by 50 K to 450 K
A method for continuous austenite rolling of a preliminary strip.
The method of claim 3,
Characterized in that said intermediate heating is carried out by induction cross-field heating
A method for continuous austenite rolling of a preliminary strip.
5. The method according to any one of claims 1 to 4,
In the case where the casting thickness (h _Br ) is less than 45 mm, all thickness reducing steps are carried out in one rolling train, and if the casting thickness (h _Br ) exceeds 60 mm, Characterized in that it is carried out in a rolling train
A method for continuous austenite rolling of a preliminary strip.
5. The method according to any one of claims 1 to 4,
In the case where the casting thickness (h _Br ) is less than 50 mm, all thickness reducing steps are carried out in one rolling train, and if the casting thickness (h _Br ) is more than 50 mm all necessary thickness reducing steps are carried out in two or more rolling trains Characterized in that
A method for continuous austenite rolling of a preliminary strip.
5. The method according to any one of claims 1 to 4,
Characterized in that the rolled thickness of the hot strip is 0.8 to 12 mm
A method for continuous austenite rolling of a preliminary strip.
5. The method according to any one of claims 1 to 4,
Characterized in that the preliminary strip produced in the continuous casting process is produced at a casting thickness of 30 mm or more
A method for continuous austenite rolling of a preliminary strip.
5. The method according to any one of claims 1 to 4,
The following conditions for determining the number (n _i or n) of adjacent successive successive thickness reduction steps for each rolling train,

or

Mapped in the process computer on the process operation level P and being individually mapped to the individual rolling stands 8a, 8b, ..., 8n; 13a, 13b of the one or more rolling trains W, W1, W2, (PW1, PW2, PW3) of the one or more rolling trains from the process computer on the basis of the condition, ≪ / RTI >
A method for continuous austenite rolling of a preliminary strip.
A combined casting and rolling facility for the production of austenitically rolled hot strips in a continuously operated casting and rolling process, said combined casting and rolling facility comprising a continuous casting facility for casting steel billets having a casting thickness of less than 300 mm (G), one or more rolling trains (8a, 8b, ..., 8n) comprising a plurality of continuous rolling stands (8a, 8b, ..., 8n) for producing hot strips rolled to a rolling thickness of 0.5 to 15.0 mm within austenite temperature range And a stripping device (10) and a strip storage device (11) located downstream of the last rolling stand, characterized in that:
Rolling stands (8a, 8b, _{of; (n i number) ...,} 8n; at least one rolling train (W, W1, W2, W3 ) of the plurality, each adjacent to a row 13a, 13b, ..., 13m ; 15a, 15b, .. 15o), wherein the number of rolling stands (n _i )

Specified by, for example,
Where T _{VB, i} [° C] is the preliminary strip temperature averaged in cross-sectional area at the end of the intermediate heating device installed at the end of the casting apparatus (in the tip region in the liquid state) or before the rolling train Wi,
T _aust [° C] is the steel quality-dependent austenite formation limit temperature (austenite final rolling temperature)
h _Br [mm] is the slab / cast thickness at solidification (= liquid tip)
d _{end, i} [mm] is the strip thickness after the n _i thickness reduction step of the i ^th rolling train,
m _vor is the number of all thickness reduction steps implemented from the slab coagulation until it is introduced into the first stand of the subsequent i ^th rolling train
Combined casting and rolling equipment.
11. The method of claim 10,
(N) of the rolling stands installed inside the rolling train satisfy the following conditions:

Is arranged by
Combined casting and rolling equipment.
11. The method of claim 10,
Characterized in that the intermediate heating devices (12, 14) are arranged between two successive rolling trains (W1 and W2 or W2 and W3)
Combined casting and rolling equipment.
13. The method of claim 12,
Characterized in that the intermediate heating device is configured as an apparatus for induction cross field heating
Combined casting and rolling equipment.
14. The method according to any one of claims 10 to 13,
Characterized in that the casting installation comprises a continuous mold (3) or a replaceable continuous mold (3) which can be adjusted to different casting thicknesses and a downstream casting guide with a billet segment capable of adjusting the gap, _In the case of a billet guide and continuous mold in which only one rolling train W with n rolling stands activated in the case of a continuous mold and with a casting thickness (h _Br ) of more than 60 mm is activated, Each having two or more rolling stands (8a, 8b, ..., 8n; 13a, 13b, ..., 13m; 15a, 15b, ..., 15o) Characterized in that the train is activated
Combined casting and rolling equipment.
14. The method according to any one of claims 10 to 13,
Characterized in that the casting equipment comprises a continuous mold (3) or a replaceable continuous mold (3) which can be adjusted to different casting thicknesses and a downstream billet guide with a billet segment capable of adjusting the gap, n number of rolling stands in the case of the billet guide and continuous mold fitted to _{Br) (8a, 8b, ...} , 8n) only one rolling train (W) is activated, 50 mm or more casting thickness (h _Br having a (N, m, o) rolling stands 8a, 8b, ..., 8n; 13a, 13b, ..., 13m; 15a, 15b, ..., , ≪ / RTI >< RTI ID = 0.0 > 15o, <
Combined casting and rolling equipment.
14. The method according to any one of claims 10 to 13,
The work rolls having a specific work roll diameter are assigned to the rolling stands in the rolling train and the work roll diameter of the work rolls in the first rolling train after the casting plant has a diameter range of 650 mm to 980 mm, Characterized in that the working roll diameter of the working rolls in the second rolling train of the first rolling train has a diameter range of 550 mm to 870 mm
Combined casting and rolling equipment.

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