WO2018172358A1 - Installation and method for the semi-continuous casting of slabs - Google Patents

Abstract

The present invention relates to an installation and a method for the semi-continuous casting of slabs (B1, B2) in an installation. The problem addressed by the invention consists in increasing the safety of installations of the type in question and simplifying the core solidification and ejection of slabs (B1, B2) from the installation. This problem is solved by an installation according to claim 1 and a method according to claim 9.

Description

description

Plant and process for semi-continuous continuous casting of block strands

Field of engineering

The present invention relates on the one hand to a plant for semi-continuous continuous casting of block strands with a single or multi-strand first casting plant for

 Continuously casting at least one first block strand and a single or multi-strand second casting plant for continuous casting of at least one second block strand. On the other hand, the invention relates to a method for semi-continuous continuous casting of block strands in a plant, comprising a single- or multi-stranded first

Casting plant for continuous casting of at least one first

Block strand and a single or multi-stranded second

Casting plant for continuous casting of at least one second

Blockstrangs.

Prior art From the publication

 A. G. Zajber "Discontinuous Continuous Casting as an Alternative to Special Steels", Stahl und Eisen 136 (2016), No. 10, pages 62-65

is a plant for semi-continuous continuous casting of block strands known. According to FIG. 4, solidified block strands can not be extended by means of weighing from the casting plant into a strand solidification position and removed therefrom after solidification. The disadvantage of this is that the method of not

solidified block strands due to the liquid

Block beach end very carefully and carefully carried out and the tertiary cooling zone for final solidification movable must be trained. To ensure the safety of the operating team, therefore, the system must be relatively complex.

Summary of the invention

The object of the present invention is to increase the safety of plants for semi-continuous continuous casting of block strands and in particular the

Solidification and subsequent discharge of the

Simplify block strands. Nevertheless, the system should have a high productivity.

This object is achieved by a system for semi ^¬ continuous continuous casting of block strands with a single or multi-strand first casting plant for continuously casting at least a first block strand and a single- or multi-strand second casting plant for continuously casting at least one second block strand according to claim 1, wherein each strand of first and the second caster in

Casting comprises the following modules:

 - A mold with an oscillator for oscillating the mold, wherein in the mold a teilerstarrter

Forming block strand;

 a first segment for supporting and guiding the

partially solidified block strand;

 - A swivel strand guide with a

Strand management framework and at least one

Strand guide section, wherein the strand guiding section has at least one strand guiding device, preferably three strand guiding rollers, for supporting and guiding the block strand, and the pivotable strand guide for conveying the block strand is pivotable about an axis of rotation;

 - Insulating flaps for adjustable heat insulation of the block strand, wherein the insulating flaps either on the swivel strand guide or a stationary

Plant dredger are arranged; and - A cold draw system for extracting a

Kaltstrangs and the subsequent block strand from the

Mold and for supporting the block strand.

The inventive system comprises at least one single- or multi-strand casting plant to the first semi-continuous continuous casting of at least one first block and a single-strand or multi-strand casting plant to the second semi ^¬ continuous continuous casting of at least one second

Blockstrangs on. In other words, the first casting plant is an n-stranded plant and the second casting plant is a m-length plant, with n £ 1,2,3 ... and m E 1,2,3 .... For example, the first casting plant may be a two-strand plant and the second casting plant a single-strand plant.

If the first and second casting plants are single-stranded plants, then the molds of these are

Casting plants supplied with a molten ladle or a movable tundish with molten steel. However, if one of the casting plants is multi-stranded, it is preferred that the casting plants are supplied with molten steel by a movable distributor trough. In this case, the

Casting speed of each casting plant separately, e.g. be controlled by a slide closure or plug. Accordingly, it is possible that on the first strand of the first casting a round block strand with a first diameter, on the second strand of the first

Casting a round block strand with a second

Diameter and on the single strand of the second

Casting a rectangular block strand is poured.

Each strand of the two casting plants has at least one mold with an oscillator, a first segment, a pivotable strand guide, insulating flaps and a

Cold extruder pull system. In the mold, typically a cooled plate or tube mold made of copper material, forms a teilerstarrter from the molten steel

Block strand out. The adhesion of the strand shell of the Block strand to the mold is prevented by an oscillator. The mold follows in the casting direction a first segment for supporting and guiding the partially solidified

Blockstrangs after. In doing so, the block strand having a thin strand shell is supported and guided by strand guiding means (e.g., strand guiding rolls) and further cooled, preferably by secondary cooling spray nozzles. Instead of or in addition to the spray nozzles, a free area between the first segment and the pivotable strand guide may be provided, so that the

 Block strand further cooled by radiation or convection. Due to the swiveling strand guide, the block strand can be supported and guided and discharged from the casting plant. For this purpose, the pivotable strand guide a strand guide frame and one or more preferably

 Strand guiding sections, wherein a strand guiding section has at least one strand guiding device for supporting and guiding the partially solidified or solidified block strand and the pivotable strand guide for discharging the

Block strand from the casting plant is pivotable about an axis of rotation. Especially with round or polygonal strands with rounded edges, it is possible to pivot

Strand guide only to promote the "self-sustaining"

Retracting block strand into the casting plant. During continuous casting and thermal insulation, the block strand is supported on the cold strand or on the cold strand extraction system. By insulating flaps mounted either on the hinged strand guide, e.g. the strand guide frame, or the stationary plant equipment (usually technological

Steel scaffold or short STAKO called), the cooling of the block strand can be controlled or regulated. The cold draw pulley system serves to pull the cold strand and the subsequent hot strand from the mold and to support the block strand.

In the plant according to the invention, the strand is supported until the complete solidification through the cold strand or the cold strangaus zugsystem and only then discharged. As a result, the system can be operated much safer. Due to the flexible configuration of the n-strand first casting plant and the m-stranded second casting plant, the production output can be easily increased if necessary, for example by increasing the strand number in the first or second casting plant.

In a preferred embodiment, the pivotable strand guide has a horizontal axis of rotation for tilting and discharging the block strand substantially transverse to

Casting direction. As a result, the block strand can be conveyed, for example, by 90 ° through frontal or lateral tilting of the strand guide.

Alternatively, the pivotable strand guide can have a vertical axis of rotation for swiveling out and discharging the block strand in the casting direction.

Particularly in the case of large-sized block strands with a cross-sectional dimension of> 500 mm, it is advantageous if the pivotable strand guide only has loose sides, so that the center of the block strand remains constant during a format change. This has u.a. the advantage that different sized block strands are always centered on the cold strand.

Highly variable block strands can be kept particularly safe, if a strand guide roller by linear process and two other strand guide rollers through

Pivoting of two guide levers on the block strand are adjustable.

Moreover, it is advantageous if a drive the

Insulating flaps can pivot about a vertical axis of rotation and the insulating flaps in the closed position, the block strand, preferably completely or substantially completely, enclose. Furthermore, it is advantageous if the movement of two radially opposite insulating flaps by a

Synchronization means, e.g. a gear, is synchronized.

The object of the invention is also by a

Method for semi-continuous continuous casting of

Block strands in a plant comprising a single- or multi-strand first casting plant for continuously casting at least one first block strand and a single- or multi-strand second casting plant for continuously casting at least one second block strand according to claim 9, comprising the steps:

 - Closing a mold of the first casting, so that a cold strand closes the mold fluid-tight;

 - pouring molten steel from a distributor trough or a ladle into the mold, whereby in the mold a teilerstarrter first block strand is formed;

 - Extracting the first block strand from the mold by means of a cold draw system, the first

Block strand is supported and guided at least in a first segment of the first casting plant;

 Stopping the pouring of molten steel into the

Mold, whereby a block strand end is formed;

 - Stop the extraction at the earliest after that

Block strand end an upper end of a hinged

 Strand management of the first casting plant has reached;

 - heat insulation until complete solidification of the first block strand by Isolierklappen;

 - Outfeeding the solidified first block strand from the first casting by the pivotable strand guide;

 - Closing a mold of the second casting, so that a cold strand closes the mold fluid-tight;

 - Method of distribution trough or ladle to the second casting plant;

 - Pouring molten steel into the mold of the second

Casting plant, which forms a partially solidified second block strand in the mold; - Extracting the second block strand from the mold of the second casting by means of a cold strand extraction system, wherein the second block strand at least in a first

Segment of the second casting plant is supported and guided;

 Stopping the pouring of molten steel into the

 Mold of the second casting plant, thereby forming a

Block strand end trains;

 - Stop the extraction at the earliest after that

Block strand end an upper end of a hinged

Strand management of the second casting plant has reached, wherein at least one step, preferably two or more than two steps, particularly preferably all steps, from the group

- method of distribution trough or ladle,

Pouring molten steel into the mold of the second casting plant,

 - Extract the second block strand,

 - stopping the pouring, and

 - stopping the extraction,

performed during the thermal insulation of the first block strand in the first casting plant,

 Heat insulation until complete solidification of the second block strand by insulating flaps,

 - Promoting the solidified second block strand from the second casting by the pivotable

Strand guide.

It is essential that the pouring of molten steel into the mold is carried out by a movable distributor trough or pouring ladle. Thus, e.g. the movable one

Distributor trough sequentially the first and the second

Supply the casting plant with molten steel. This feature dramatically lowers costs as the cost of delivering the single distributor is significantly lower. A second feature is also particularly important, namely that at least one step, preferably two or more than two steps, particularly preferably all steps, from the group - method of distribution trough or ladle,

Pouring molten steel into the mold of the second casting plant,

 - Extract the second block strand,

 - stopping the pouring and

 - stopping the extraction of the second block strand while, i. parallel in time, be carried out for heat insulation of the first block strand to solidification of the block strand in the first casting. As a result, despite the relatively long time for the thermal insulation of the

Block strands production performance are kept high.

Since only solidified block strands are always discharged in the process according to the invention, the system can be operated very safely.

It is advantageous if the discharge is carried out by tilting the pivotable strand guide about a horizontal axis of rotation and then the block strand is substantially conveyed transversely to the casting direction, or if the Ausfördern carried out by pivoting the pivotable strand guide about a vertical axis of rotation and then the block strand in Casting is carried out. For the internal quality of the block strands, it is advantageous if a block strand in the mold and / or during the thermal insulation of the block strand is electromagnetically stirred. In order to keep the distance between the strand agitator and the block strand low, it is favorable when the insulating flaps are opened, a strand agitator in the region of

retracted insulating flaps is retracted and then the strand agitator stirs the block strand electromagnetically.

Furthermore, it is advantageous if, after the electromagnetic stirring of the block strand, the strand agitator is extended out of the region of the opened insulating flaps and subsequently the insulating flaps closed again or at least

partially closed again.

By both measures, the distance between the stirrer and the block strand is kept short, so that the efficiency of the electromagnetic stirring is high.

To keep a block strand end of a block strand liquid longer, it is advantageous if the block strand end

at least partially during the thermal insulation of the

Block strand is heated by a so-called "hot topping" treatment whereby a powder (eg an exothermic powder) is applied to the block strand end and has the effect that inclusions and impurities accumulate at the block strand end and the remainder of the block strand has a higher purity. The block strand end is thermally insulated by the powder and optionally by a cap enclosing the strand head After the block strand has solidified, the cap can be removed again and reused if necessary The block strand end can also be removed, if necessary, eg outside the plant.

Brief description of the drawings

Further advantages and features of the present invention will become apparent from the description of non-limiting embodiments. The following schematic

Figures shown show:

Figure 1 is an elevation and a side elevation of a plant for semi-continuous continuous casting of block strands with a single-strand first casting plant for continuously casting at least a first block strand and a single-stranded second casting plant for continuously casting at least one second block strand

Figure 2 shows the section AA of Figure 1 with a strand guide and Isolierklappen for frontal removal by tilting 3 shows a plan view of a strand guide for two

Block strands with insulating flaps for lateral removal by tilting

4 shows a plan view of a strand guide for two

Block strands with insulating flaps for frontal removal by tilting

5 shows an elevation and a side elevation of a single-stranded system for the removal by pivoting the strand guide and two sectional views of the strand guide

6 shows a plan view of a strand guide for a

Block strand with Isolierklappen and a sectional view

7 and 8 process steps in carrying out the method according to the invention

9 shows a side view of a system according to the invention with a laterally tiltable strand guide

Description of the embodiments

1 shows the simplest form of a system according to the invention for semi-continuous continuous casting of

Block strands Bl, B2 with a single-stranded first

Casting plant GAl for continuously casting at least one first block strand Bl and a single-stranded second casting plant GA2 for continuously casting at least one second block strand B2. The molds 3 of both casting plants are about a ladle 1 and a movable distributor trough 2 with

Supplied molten steel. The strands of both casting plants GA1, GA2 are constructed essentially identical. In the mold 3, a partially solidified block strand Bl, B2 forms with a thin strand shell. The adhesion of the strand shell of the respective block strand Bl, B2 to the copper plates of the mold 3 is prevented by an oscillator 4. Of the teilerstarrte block strand Bl, B2 is pulled through the cold strangaus zugsystem with the cold strand traverse 20, the drive 21 and the sprocket 22. ^{Of course} , the block ^strand could also be pulled out by a hydraulic cylinder carrying the cold strand 19. Below the mold 3, a first segment 5 with

Strand guide rollers 9 (see Figure 2) for supporting and guiding the respective block strand Bl, B2 arranged. 2 shows the section A-A of the frontally tiltable strand guide 6 (the tilting direction is shown by an arrow). The block strand B2 is in a

Strand guide section 8 supported by three strand guide rollers 9. The middle strand guide roller 9 is made by a hydraulic cylinder 13; the two outer ones

Strand guide rollers 9 are each from a

Hydraulic cylinder 13 employed via guide lever 12.

But instead of hydraulic cylinders 13 could also

Spindle drives or similar be used. The adjustable heat insulation of the block strand B2 in one

 Strand guiding section 8 is effected by two insulating flaps 11, which can be opened and closed by a drive. The insulating flaps 11 are not swiveled during the discharge of the block strand B2 and remain on

Plant equipment 10.

FIG. 1 also shows the pivotable strand guide 6 with the strand guiding frame 7 and several strand guiding sections 8. The pivotable strand guide 6 has a horizontal axis of rotation DA and can through the

Hydraulic cylinder 13 can be tilted by 90 °. The conveying out of the block strand then takes place transversely to the casting direction (see FIG. 1, side elevation). The process sequence according to the invention is illustrated in FIGS. 7 and 8 on the basis of a single-strand first casting installation GA1 and a single-stranded second casting installation GA2. In the leftmost step a, the molds 3 of the two were Casting plants GAl, GA2 already sealed by a cold strand 19, eg in the casting direction by "top feeding" or counter to the casting by "bottom feeding", and the tundish 2 and the ladle 1 is located above the first casting plant GAl. After pouring

 Steel melt was started in the mold 3 of the first casting plant GAl (step b), for example. By raising a plug in the distributor trough 2, forms in the mold a pouring mirror. As a result of the solidification of the molten steel on the mold 3, a solidified block strand beginning and a partially solidified first block strand Bl are formed. The first block strand Bl is then inserted through

Cold strangaus zugsystem 20, 21, 22 from the mold. 3

pulled out and then supported and guided in a first segment 5 by strand guide rollers 9 and

Spray nozzles 24 further cooled (step c). In step d, the block strand Bl has reached its target length and target weight, and the pouring of molten steel has been stopped. The block strand Bl is still pulled out of the mold 3, at least until the upper end of the

 Block strand Bl (also called block strand end) has reached an upper end of the pivotable strand guide 6 (step e). The partially solidified block strand Bl is subsequently controlled or cooled in a controlled manner until completely solidified by insulating flaps 11 and then discharged by means of the pivotable strand guide 6. The block strand Bl is supported on the cold strand 19. The discharge of the solidified first block strand Bl from the first casting installation GA1 - step f - is not explicitly shown in FIGS. 7 and 8; to the position shown in phantom with the pivotable

Strand guide 6 and the strand guide frame 7, and to the Figures 2, 3 (each arrow) and Fig 5 referenced. It should be noted, however, that not necessarily the first block strand Bl from the first

Casting GAl is discharged before the casting operation of the second casting plant GA2 is started. In the second

Caster GA2 is found in Fig 7 still no casting operation. In FIG. 8, the ladle 1 or the distributor trough 2 has been moved to the second casting installation GA2 in the direction of the arrow and is located above the mold 3 of the second casting installation GA2 (step g)

Cold strand 19 sealed. It is immaterial when the mold 3 was actually sealed. It is only important that the mold is closed, as soon as with the

Pouring molten steel is started. In step h, analogously to step b, molten steel is poured into the mold 3 of the second casting plant, and the second one is connected

Block strand B2 pulled out of the mold 3 of the second casting plant GA2, supported in the first segment 5 and guided and possibly further cooled, the pouring of molten steel stopped (step i), the extraction of the second block strand B2 stopped (step k) and connect the second Block strand B2 thermally insulated until completely solidified by Isolierklappen 11. The conveying out of the second block strand is again effected by means of the pivotable strand guide 6.

In the method according to the invention, it does not matter whether the first casting machine GA1 is single-stranded or, for example, as shown in FIGS. is two-stranded. In a two-strand first casting plant GAl would two molds by a longer

Distributor trough 2 supplied with melt, so that e.g.

parallel two first block strands form Bl.

3 shows the pivotable strand guide 6 of a two-strand caster with insulating flaps 11. The first and the second block strand Bl, B2 can each be swung laterally, the arrows indicate the Ausschwenkrichtung. Due to the specified arrangement of the strand guides 6 for the two block strands Bl and B2, the system can be built very compact and in particular a short

Strand spacing 14 are maintained.

4 shows an alternative to Figure 3 arrangement of the strand guides 6, wherein the strand spacing 14 between the first and second block strand Bl, B2 is substantially larger than in FIG. 3. In this case, the cold strand spars 20 of the first and second casting plants GA1, GA2 are arranged collinear, so that I give a greater strand spacing 14. The block strands Bl, B2 are each forward

swung; the insulating flaps 11 are each connected to the pivotable strand guide 6 of the first and the second caster GAl, GA2.

6, the strand guide 6 is shown with further details. The one in the left view with two

Circular shown in different diameters

Block strand Bl is supported on the circumference by three strand guide rollers 9, wherein a strand guide rollers 9 of a linearly movable hydraulic cylinder 13 and two further strand guide rollers 9 each of a pivotable

Guide lever 12 is held. The Isolierklappen 11 are switched on and swung by a drive 23.

5 shows the discharge of a block strand Bl from the first casting plant GAl by means of a pivotable

Strand guide 6. Concretely, the strand guide frame 7 of the pivotable strand guide 6 has a vertical axis of rotation DA, so that the block strand Bl with him holding

Strand guide rollers 9 can be swung out. After swinging the block strand Bl can be taken either directly from a crane from the pivoting strand guide 6, the strand guide rollers 9 solved and the block strand Bl

be removed, or the block strand Bl is lowered by another manipulator 18 and then discharged.

FIG. 9 shows a side elevation of a system according to the invention. In contrast to FIG. 1, the drive of the cold strand 19 and the cold strand traverse 20 takes place via two

Drives 21 and associated spindles. The distributor trough 2 with two plugs can supply a double-stranded first casting installation GA1 and a single-stranded second casting installation GA2. The pivotable strand guide 6 with the strand guide frame 7 is pivoted via a hydraulic cylinder 13 (see arrow for the pivoting direction); In addition, the strand guide frame 7 can be moved linearly in the swung-out state, so that the block strand Bl can be easily removed.

Although the invention in detail by the preferred

While embodiments have been further illustrated and described, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the present invention

To leave invention.

LIST OF REFERENCE NUMBERS

1 ladle

 2 distributor trough

3 mold

 4 oscillators

 5 first segment

 6 strand guide

 7 strand guide frame 8 strand guide section

9 strand guide roller

10 plant equipment

11 insulating flaps

 12 guide lever

13 hydraulic cylinders

14 strand spacing

 18 manipulator

 19 cold strand

 20 cold strand traverse 21 drive

 22 sprocket

 23 drive

 24 spray nozzles Bl first block strand

B2 second block strand

DA axis of rotation

 GAl first casting plant

GA2 second casting plant

Claims

claims 1. plant for semi-continuous continuous casting of Block strands (Bl, B2) with a single or multi-strand first casting plant (GAl) for continuously casting at least one first block strand (Bl) and a single- or multi-strand second casting plant (GA2) for continuously casting at least one second block strand (B2), each strand the first and the second casting plant (GA1, GA2) comprises the following assemblies:  - A mold (3) with an oscillator (4) for Oscillating the mold (3), wherein in the mold (3) a teilerstarrter block strand (Bl, B2) is formed;  - A first segment (5) for supporting and guiding the partially solidified block strand (Bl, B2);  - A swivel strand guide (6) with a Strand guide frame (7) and at least one Strand guiding section (8), wherein the strand guiding section (8) at least one strand guiding device, preferably three strand guiding rollers (9) for supporting and guiding the Block strand (Bl, B2) and the pivotable Strand guide (6) for conveying out the block strand (Bl, B2) about an axis of rotation (DA) is pivotable;  - Isolierklappen (11) for adjustable heat insulation of the block strand (Bl, B2), wherein the Isolierklappen are arranged either on the pivotable strand guide (6) or a stationary plant driveline (10);  - A cold strangaus zugsystem (20, 21, 22) for taking out a cold strand (19) from the mold (3) and for supporting the block strand (Bl, B2). 2. Plant according to claim 1, characterized in that the pivotable strand guide (6) has a horizontal axis of rotation (DA) for tilting and discharging the block strand (Bl, B2) in Has substantially transverse to the casting direction. 3. Plant according to claim 1, characterized in that the pivotable strand guide (6) has a vertical axis of rotation (DA) for swiveling out and conveying out the block strand (Bl, B2) in the casting direction. 4. Installation according to one of the preceding claims, characterized in that the pivotable strand guide (6) only Losseiten has, so that the center of the block strand (Bl, B2) remains constant during a format change. 5. Plant according to claim 4, characterized in that a strand guide roller (9) by linear method and two further strand guide rollers (9) by pivoting two guide levers (12) to the block strand (Bl, B2) are adjustable. 6. Installation according to one of the preceding claims, characterized in that a drive, the insulating flaps (11) can pivot about a vertical axis of rotation and the Isolierklappen (11) in the closed position the Enclose block strand (Bl, B2). Installation according to claim 6, characterized in that the movement of two radially opposed insulating flaps (11) is provided by a synchronizing means, e.g. a gear, is synchronized. 8. Installation according to one of the preceding claims, characterized in that a free area is arranged in the casting direction between the end of the first segment (5) and the pivotable strand guide (6). 9. A method for semi-continuous continuous casting of block strands (Bl, B2) in a plant, preferably according to one of the preceding claims, comprising a single- or multi-strand first casting plant (GAl) for continuously casting at least a first block strand (Bl) and a or multi-stranded second casting installation (GA2) for continuous casting of at least one second block strand (B2), comprising the steps: - Closing a mold (3) of the first casting plant (GAl), so that a cold strand (19) closes the mold (3) fluid-tight;  - Pouring molten steel from a distributor trough (2) or a ladle (1) in the mold (3), whereby in the mold (3) a teilerstarrter first block strand (Bl) is formed;  - Extracting the first block strand (Bl) from the mold (3) by means of a cold extrusion system (20, 21, 22), wherein the first block strand (Bl) at least in a first segment (5) of the first casting plant (GAl) is supported and guided ;  Stopping the pouring of molten steel into the Mold (3), whereby a block strand end is formed;  - Stop the extraction at the earliest after that Block strand end an upper end of a hinged  Strand guide (6) of the first casting plant (GAl) has reached;  - Heat insulation until complete solidification of the first block strand (Bl) by Isolierklappen (11);  - Promoting the solidified first block strand (Bl) from the first casting plant (GAl) by the pivotable Strand guide (6);  - Closing a mold (3) of the second casting plant (GA2), so that a cold strand (19) closes the mold (3) fluid-tight;  - Method of the distributor trough (2) or the ladle (1) to the second casting plant (GA2);  Pouring molten steel into the mold (3) of the second casting installation (GA2), whereby a partially solidified second block strand (B2) is formed in the mold (3);  - Extracting the second block strand (B2) from the  Mold (3) of the second casting plant (GA2) by means of a Cold train pull system (20, 21, 22), wherein the second Block strand (B2) is supported and guided at least in a first segment (5) of the second casting plant (GA2);  Stopping the pouring of molten steel into the Mold (3) of the second casting plant (GA2), whereby a block strand end is formed; - Stop the extraction at the earliest after that Block strand end an upper end of a hinged Strand guide (6) of the second casting plant (GA2) has reached, wherein at least one step, preferably two or more than two steps, particularly preferably all steps, from the group  - Method of the distributor trough (2) or the ladle (1) ,  Pouring molten steel into the mold (3) of the second casting plant (GA2),  - Extracting the second block strand (B2),  - stopping the pouring and  - stopping the extraction, during the thermal insulation of the first block strand (B1) in the first casting plant (GAl),  Heat insulation until complete solidification of the second block strand (B2) by insulating flaps (11), - Outfeeding the solidified second block strand (B2) from the second casting plant (GA2) by the pivotable strand guide (6). 10. The method according to claim 9, characterized in that the outfeed by tilting the pivotable Strand guide (6) about a horizontal axis of rotation (DA) takes place and then the block strand (Bl, B2) is conveyed substantially transversely to the casting direction. 11. The method according to claim 9, characterized in that the Ausfördern by the pivoting of the pivotable strand guide (6) about a vertical axis of rotation (DA) and then the block strand (Bl, B2) is discharged in the casting direction. 12. The method according to any one of claims 9 to 11, characterized in that the block strand (Bl, B2) is stirred electromagnetically in the mold (3). 13. The method according to any one of claims 9 to 12, characterized in that the block strand (Bl, B2) is stirred electromagnetically during the thermal insulation. 14. The method according to any one of claims 9 to 13, characterized in that the Isolierklappen (11) are opened, a strand agitator in the region of the opened Isolierklappen (11) is retracted and then the strand agitator the block strand (Bl, B2) is electromagnetically stirred. 15. The method according to claim 14, characterized in that after the electromagnetic stirring of the block strand (Bl, B2) of the strand agitator from the region of the open Isolierklappen (11) is extended and then the Isolierklappen (11) are at least partially closed. 16. The method according to any one of claims 9 to 15, characterized in that the block strand end of at least one block strand (Bl, B2) at least partially during the Heat insulation of the block strand (Bl, B2) is heated by a "hot topping" treatment.