DE102013200742B4 - Continuous cast composite - Google Patents

Abstract

Method for the continuous continuous casting of a strand of a continuously cast composite material (1), comprising the following steps: - Filling a liquid, metallic base material (2), preferably a molten steel, into the mold cavity (3) of a mold (4) so that it is inside the mold (4) forms a melt bath (5) with a meniscus (6); - Introducing a solid, preferably wire-shaped, additive (7) into the melt bath (5) at an insertion speed, the additive (7) being skewed to the pouring direction (GR) in the melt bath (5) is introduced and the contact area (12) of the additive (7) with the meniscus (6) migrates during the continuous casting; - cooling of the melt bath (5) in the cooled mold (4) so that the mold ( 4) an at least partially solidified strand (1) is formed; - pulling the at least partially solidified strand (1) in the casting direction (GR) out of the mold (4) at a casting speed, the component being the insertion speed in the casting direction (GR) corresponds to the casting speed; - supporting, guiding and further cooling the drawn strand (1) in a strand guide (8) following the mold (4).

Description

Technical field

The present invention relates to a method for producing a strand of a composite material by continuous casting, the composite material, and a continuous casting machine for producing the composite material.

State of the art

In continuous casting, a liquid, metallic base material (e.g. a molten steel) is continuously cast in a mold to form an at least partially solidified strand. The metallic melt is typically introduced into the mold through a pouring tube, as a result of which a melt bath is formed in the mold. The melt begins to solidify on the side walls of the cooled mold and forms a partially solidified strand with an initially thin strand shell in the mold. The strand is continuously pulled out of the mold and supported, guided and further cooled in the strand guide following the mold. This increases the thickness of the strand shell until a completely solid strand is obtained.

Due to the relatively slow cooling of the strand in the mold (called primary cooling) and in the subsequent strand guide (called secondary cooling), a relatively coarse-grained structure (the so-called casting structure) forms in the strand. As a result, the continuously cast strand has a relatively low strength. In order to limit grain growth, it is known in the area of the strand guide to “hard” cool the strand, but even so the strand has insufficient strength. Since the strand shell of the partially solidified strand must also have a minimum thickness when it is pulled out of the mold, the slow cooling in the mold also results in a relatively slow casting speed. Finally, the slow cooling of the strand also means that the continuous casting machine has a relatively large length (metallurgical length).

To increase the strength of the continuously cast strand, the strand is usually hot rolled after the continuous casting. Here, the continuously cast strand - either using the so-called pouring heat immediately after leaving the continuous casting machine or after cooling and subsequent reheating of the strand - is formed by typically several rolling passes. As a result of the forming, the casting structure of the strand is subjected to one or more, static or dynamic, recrystallization steps, so that the rolled material has a fine-grained structure (called a rolling or deformation structure) and a higher strength.

A disadvantage of this multi-stage manufacturing process of continuous casting and hot rolling is that it significantly increases the manufacturing costs.

To reduce the overall length of a continuous casting machine, it is out of the WO 2011/117296 A1 Known to use so-called heat pipes or so-called thermosiphones in the area of the meniscus of the mold. The disadvantage of this is that another medium (eg water or hydrocarbons such as an alcohol or a so-called thermal oil) is used within the heat pipe or the thermosiphon and the contact between the metallic melt and this medium must be reliably prevented. In addition, it must always be ensured that the melt pool around the heat pipe or the thermosiphon does not freeze.

From the DE 33 46 391 A1 a continuous casting process for producing multilayer materials is known. In this method, sheets are introduced into the mold during the continuous casting of a slab format and weld with the liquid metal during continuous casting. Similar disclosures are US 3,710,844 A and the US 4,356,618 A refer to.

Summary of the invention

The object of the invention is to overcome the disadvantages of the prior art and to present a method for the continuous casting of a strand of a continuously cast composite material and the composite material produced thereby, in which the composite material has a higher strength than the base material produced by continuous casting. Another object is to provide a continuous casting machine for performing the method according to the invention.

• - Einfüllen eines flüssigen, metallischen Grundstoffs, vorzugsweise einer Stahlschmelze, in den Formhohlraum einer Kokille, sodass sich innerhalb der Kokille ein Schmelzenbad mit einem Meniskus ausbildet;
• - Einführen eines festen, vorzugsweise drahtförmigen, Zusatzstoffes mit einer Einführgeschwindigkeit in das Schmelzenbad, wobei der Zusatzstoff windschief zur Gießrichtung in das Schmelzenbad eingeführt wird und der Kontaktbereich des Zusatzstoffes mit dem Meniskus während des Stranggießens wandert;
• - Abkühlen des Schmelzenbads in der gekühlten Kokille, sodass sich in der Kokille ein zumindest teilerstarrter Strang ausbildet;
• - Ausziehen des zumindest teilerstarrten Strangs in Gießrichtung aus der Kokille mit einer Gießgeschwindigkeit, wobei die Komponente der Gießgeschwindigkeit in Gießrichtung der Einführgeschwindigkeit entspricht;
• - Stützen, Führen und weiteres Abkühlen des ausgezogenen Strangs in einer der Kokille nachfolgenden Strangführung.

This object is achieved by a method for the continuous continuous casting of a strand of a continuously cast composite material, which comprises the following steps:

• - Filling a liquid, metallic base material, preferably a molten steel, into the mold cavity of a mold, so that a melt bath with a meniscus forms within the mold;
• - Introducing a solid, preferably wire-shaped, additive into the melt bath at an insertion speed, the additive being introduced obliquely to the pouring direction into the melt bath and the contact area of the additive migrating with the meniscus during continuous casting;
• - Cooling the melt bath in the cooled mold, so that an at least partially solidified strand forms in the mold;
• Pulling the at least partially solidified strand in the casting direction out of the mold at a casting speed, the component of the casting speed in the casting direction corresponding to the insertion speed;
• - Supporting, guiding and further cooling the drawn strand in a strand guide following the mold.

In the method according to the invention, a liquid, metallic base material is poured in a known manner in a continuous casting mold of a continuous casting machine. The base material (e.g. a steel melt) is filled as a melt, typically from a tundish via a pouring tube (e.g. a submerged entry nozzle) into the mold cavity of the cooled mold, which means that a melt bath co-forms within the mold a meniscus. According to the invention, a solid, preferably wire-shaped and metallic, additive is additionally introduced into the melt bath at an insertion rate. Due to the cooling of the melt pool in the cooled mold, a strand - partially solidified or solidified - is formed in the mold, which subsequently forms in the casting direction (vertically in a so-called vertical system, essentially vertically in a so-called arc system with a curved mold, or horizontally in one so-called horizontal system) is pulled out of the mold at a casting speed. By introducing the additive into the melt bath at the rate of introduction, a composite material (also called composite material) is already formed in the mold, i.e. a material made of two or more interconnected materials. In order to ensure the influence of the additive on the longitudinal extent of the continuously extruded composite material, the component of the rate of introduction of the additive in the pouring direction corresponds to the pouring speed with which the at least partially solidified strand of the composite material is pulled out of the mold. Expressed mathematically, this means that the scalar product of the insertion speed with the unit vector in the casting direction corresponds to the amount of the casting speed. The drawn strand of the composite material is supported in a known manner in the strand guide following the mold, guided and further cooled.

This ensures that the additive - e.g. along a helix with constant or variable pitch - to be distributed in the strand so that the strand of the composite material has more uniform properties in the longitudinal direction.

A particularly intimate connection between the base and the additive is achieved if the additive melts at least locally after being introduced into the melt bath. Here, e.g. only melt an outer layer of the additive in the melt bath.

Alternatively, it is of course also possible to introduce an additive that does not melt after being introduced into the melt bath, e.g. the additive has a higher melting point than the base material (e.g. a wire-shaped additive made of tungsten, which is introduced into a steel melt as the base material). It should be immediately apparent that the strength of the continuously cast composite material can be increased by using a high-melting additive which has high strength. However, even the use of a similar additive (e.g. steel base and additive) significantly increases the strength of the continuously cast composite. This is due to the fact that the composite material, at least locally - i.e. using the cold additive in the hot melt bath - i.e. near the additive - has a much finer structure, which increases the strength of the composite.

The properties of the composite material can be adjusted particularly precisely if the additive has a multilayer structure. For example, the outer layer can be alloyed differently from the core, so that the outer layer forms an intimate, solid alloy together with the base material. For this purpose, it is expedient if the core and the outer layer of the additive have different chemical compositions. E.g. the outer layer may have a lower melting point than the core.

It is particularly advantageous if several additives are introduced into the melt bath from the meniscus at different locations at the same time. The multiple additives can either be of the same type or - e.g. depending on the expected load on the composite material - different (i.e. at least of two types - this should include different chemical compositions, different diameters ...). This enables the properties of the composite to be set in a targeted manner.

It is particularly advantageous if the additive is introduced into the melt bath outside the edge of the mold cavity, so that the additive in the composite material is completely in the base material is embedded. As a result, the circumference of the additive is always at a distance from the circumference of the composite. Due to the complete embedding, the mechanical loads in the composite material are transferred from the base to the additive and vice versa in a favorable manner.

The strand-like composite material which can be produced by the method according to the invention has a metallic base material, preferably steel, and a, preferably metallic, additive which is firmly connected to the base material, is embedded in a helical shape in the base material and extends over the entire longitudinal extent of the composite material . Due to the helical embedding of the additive in the base material, the composite material has relatively uniform mechanical properties over its longitudinal extent.

It is particularly advantageous if there are several additives in a normal plane to the longitudinal direction of the composite material. As a result, the composite material has relatively uniform mechanical properties even in the normal direction.

In order to lower the density of the composite material, the composite material can have at least one through hole in a normal plane to the longitudinal direction of the composite material, which through the use of a hollow additive in a melt bath in a mold can be produced by continuous casting.

• - eine gekühlte Kokille mit einem Formhohlraum zum Stranggießen einer metallischen Schmelze;
• - zumindest eine Einspuleinrichtung zum Einspulen eines drahtförmigen Zusatzstoffes in den Formhohlraum der Kokille, wobei die Einspuleinrichtung einen Antrieb zum Einführen des Zusatzstoffes mit einer einstellbaren Einführgeschwindigkeit umfasst;
• - eine der Kokille nachfolgende Strangführung zum Stützen, Führen und weiteren Abkühlen des Strangs, wobei die Strangführung eine Auszieheinrichtung zum Ausziehen des Strangs aus der Kokille in Gießrichtung umfasst;
• - eine Messeinrichtung zur Messung der Ausziehgeschwindigkeit des Strangs aus der Kokille;
• - eine Regeleinrichtung, die signaltechnisch mit der Messeinrichtung und dem Antrieb verbunden ist, sodass die Komponente der Einführgeschwindigkeit in Gießrichtung der Ausziehgeschwindigkeit entspricht.

A continuous casting machine for producing the composite material according to the invention comprises

• a cooled mold with a mold cavity for the continuous casting of a metallic melt;
• - At least one inductor for injecting a wire-shaped additive into the mold cavity of the mold, the inductor comprising a drive for introducing the additive at an adjustable insertion speed;
• a strand guide following the mold for supporting, guiding and further cooling the strand, the strand guide comprising a pull-out device for pulling the strand out of the mold in the casting direction;
• - A measuring device for measuring the pulling speed of the strand from the mold;
• - A control device, which is connected to the measuring device and the drive in terms of signals, so that the component of the insertion speed in the casting direction corresponds to the pull-out speed.

To produce a composite material in which the additive is embedded in a helical shape, it is expedient if the winding device of the continuous casting machine comprises a rotary drive for rotating the winding device about the longitudinal axis of the mold.

Figure list

• 1A und 1B: einen Aufriss und eine geschnittene Grundrissdarstellung des Kokillenbereichs einer ersten Ausführungsform einer Stranggießmaschine,
• 2: eine Schnittdarstellung des Kokillenbereichs einer zweiten Ausführungsform einer Stranggießmaschine zur Durchführung des erfindungsgemäßen Verfahrens und
• 3: eine Schnittdarstellung durch einen erfindungsgemäßen Strang des stranggegossenen Verbundwerkstoffs.

Further advantages and features of the present invention result from the following description of non-limiting exemplary embodiments, reference being made to the following figures, which show:

• 1A and 1B 1 shows an elevation and a sectional plan view of the mold area of a first embodiment of a continuous casting machine,
• 2nd a sectional view of the mold area of a second embodiment of a continuous casting machine for performing the method according to the invention and
• 3rd : A sectional view through a strand of the continuously cast composite material according to the invention.

Description of the embodiments

in das Schmelzenbad 5 eingeführt. Der Stahldraht 7 wird dabei parallel zur Gießrichtung GR eingeführt. Um die Darstellung nicht unnötig zu verkomplizieren, wurde lediglich eine einzige Drahteinspuleinrichtung 9 dargestellt. Die weiteren sechs Drahteinspuleinrichtungen 9 sind gleich ausgeführt und in radialer Richtung unter Einhaltung eines gleichmäßigen Winkelversatzes um die Längsachse der Kokille 4 verteilt. Durch das Abkühlen des Schmelzenbads 5 in der gekühlten Kokille 4 bildet sich in der Kokille 4 ein teilerstarrter Strang 1 des Verbundwerkstoffs aus, der durch nicht näher dargestellte angetriebene Strangführungsrollen aus der Kokille 4 ausgezogen wird. So wie bei Stranggießmaschinen üblich, befinden sich die angetriebenen Strangführungsrollen (auch Treibrollen genannt) in der der Kokille 4 nachfolgenden Strangführung. Der drahtförmige Zusatzstoff 7 weist eine nicht glatte Oberflächenstruktur - ähnlich der eines sogenannten Bewehrungsstahls - auf, wodurch die Oberfläche des Zusatzstoffes 7 bei gleichem Durchmesser vergrößert wird. Um gleichmäßige Eigenschaften des Verbundwerkstoffs 1 in Gießrichtung GR sicherzustellen, wird der Zusatzstoff 7 mit einer Einführgeschwindigkeit $\left(\overrightarrow{{\nu }_E}\right),$

in das Schmelzenbad 5 eingeführt, die der Gießgeschwindigkeit $\left(\overrightarrow{{\nu }_G}\right),$

(auch Ausziehgeschwindigkeit genannt) entspricht. Durch die Verwendung des zum Grundstoff (Stahlschmelze) 2 gleichartigen Zusatzstoffes (Stahldraht) 7 schmilzt zumindest die Oberfläche des Stahldrahts 7 im Schmelzenbad 5 auf, wodurch eine innige Verbindung zwischen Grund- und Zusatzstoff 2, 7 sichergestellt wird. Durch die lokal unterschiedliche Abkühlung der heißen Schmelze 2 durch den Stahldraht 7 weist der Strang 1 des Verbundwerkstoffs zumindest im Bereich des eingeschmolzenen Stahldrahts 7 ein wesentlich feineres Gefüge auf, sodass der durch das erfindungsgemäße Verfahren hergestellte Strang 1 verglichen mit konventionell stranggegossenen Strängen mit gleicher chemischer Zusammensetzung eine wesentlich höhere Festigkeit aufweist. Die in 1A dargestellte Regeleinrichtung 18 stellt sicher, dass die Komponente der Einführgeschwindigkeit $\left(\overrightarrow{{\nu }_E}\right),$

in Gießrichtung GR der mittels der Messeinrichtung 19 gemessenen Gießgeschwindigkeit $\left(\overrightarrow{{\nu }_G}\right),$

entspricht. Dazu wird der Antrieb 20 der Drahteinspuleinrichtung 9 entsprechend angesteuert.In the 1A is a sectional view of an elevation of the mold area of a continuous casting machine for continuous casting of a strand 1 of a continuously cast composite material. When continuously casting the strand 1 becomes a raw material 2nd in the form of a molten steel from a casting distributor, not shown, which is above a mold 4th the casting machine is arranged via a pouring tube 11 in the mold cavity 3rd the mold 4th filled. In the case shown, the mold is 4th designed as a water-cooled tubular mold, which has a round mold cavity 3rd with a diameter of 100 mm. By pouring the molten steel into the mold 4th forms in the mold cavity 3rd a melt pool 5 with a meniscus 6 out. It also has several wire feeders 9 and deflection units with internal deflection rollers 10th a solid, wire-shaped additive 7 in the form of a steel wire with a diameter of 3 mm with an insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

in the melt pool 5 introduced. The steel wire 7 becomes parallel to the casting direction GR introduced. In order not to complicate the illustration unnecessarily, only a single wire winding device was used 9 shown. The other six wire winding devices 9 are designed identically and in the radial direction while maintaining a uniform angular offset around the longitudinal axis of the mold 4th distributed. By cooling the melt pool 5 in the chilled mold 4th forms in the mold 4th a partially solidified strand 1 of the composite material, the driven strand guide rollers, not shown, from the mold 4th is pulled out. As is usual with continuous casting machines, the driven strand guide rollers (also called drive rollers) are located in the mold 4th subsequent strand guide. The wire-shaped additive 7 has a non-smooth surface structure - similar to that of a so-called reinforcing steel - which causes the surface of the additive 7 is enlarged with the same diameter. To ensure uniform properties of the composite 1 in the casting direction GR ensure the additive 7 with an insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

in the melt pool 5 introduced that of casting speed $\left(\overrightarrow{{\nu }_G}\right),$

(also called pull-out speed). By using the base material (molten steel) 2nd similar additive (steel wire) 7 at least melts the surface of the steel wire 7 in the melt pool 5 on, creating an intimate connection between base and additive 2nd , 7 is ensured. Due to the locally different cooling of the hot melt 2nd through the steel wire 7 points the strand 1 of the composite material at least in the area of the melted steel wire 7 a much finer structure, so that the strand produced by the method according to the invention 1 has a much higher strength compared to conventionally cast strands with the same chemical composition. In the 1A shown control device 18th ensures that the component of insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

in the casting direction GR that by means of the measuring device 19th measured casting speed $\left(\overrightarrow{{\nu }_G}\right),$

corresponds. This is the drive 20th the wire winding device 9 controlled accordingly.

The 1B shows a section along the cutting line AA of 1A . This shows that the additives 7 each a distance a to the edge of the mold cavity 3rd the mold 4th exhibit. The contact area migrates during continuous casting 12th between the additive 7 and the meniscus 6 Not.

The strand created in this way 1 of the composite material is after the mold 4th supported in a known manner in the vertical strand guide, not shown, guided and further cooled by means of cooling nozzles (cf. also 2nd , in which part of the strand guide 8th , the roles 16 and the cooling nozzles 17th are shown). After solidification, the strand 1 separated and conveyed out of the continuous casting machine. After the conveying, the strand can 1 either be used directly for subordinate applications or hot-rolled in a known manner.

in das Schmelzenbad 5 erfolgt windschief zur Gießrichtung GR. Um sicherzustellen, dass der Zusatzstoff 7 über die Längserstreckung des Strangs 1 stets im Strang 1 vorhanden ist, entspricht die Komponente der Einführgeschwindigkeit $\left(\overrightarrow{{\nu }_E}\right),$

in Gießrichtung GR der Gießgeschwindigkeit $\left(\overrightarrow{{\nu }_G}\right),$

Zur Verdeutlichung dessen ist links neben der Kokille 4 das Geschwindigkeitsdreieck für $\left(\overrightarrow{{\nu }_E}\right),$

und $\left(\overrightarrow{{\nu }_G}\right),$

in einer nicht maßstabsgerechten Darstellung gezeigt. Durch das Ausziehen des Strangs 1 in Gießrichtung GR mit der Gießgeschwindigkeit $\left(\overrightarrow{{\nu }_G}\right),$

und die Rotation der Drahteinspuleinrichtungen 9 um die Längsachse 15 der Kokille 4 sind die Zusatzstoffe 7 im Strang 1 des Verbundwerkstoffs schraubenlinienförmig eingebettet. Die Kontaktbereiche 12 zwischen den Zusatzstoffen 7 und dem Meniskus 6 rotieren beim Stranggießen um die Längsachse 15 der Kokille 4. In 2 wurde lediglich die schraubenlinienförmige Einbettung eines Zusatzstoffes 7 im Strang 1 schematisch dargestellt. Durch die Einbettung der kalten Zusatzstoffe 7 in die heiße Schmelze des Grundstoffs 2 weist der Strang 1 des Verbundwerkstoffs zumindest in der Umgebung der Zusatzstoffe 7 ein feines Gefüge und somit eine hohe Festigkeit auf. Die Regeleinrichtung 18, die Messeinrichtung 19 und der Antrieb 20 aus 1A sind auch in 2 vorhanden, wurden jedoch nicht dargestellt.The 2nd shows a further embodiment of a section of the continuous casting machine for performing the method according to the invention. This is done in a tube mold 4th with a round mold cavity 3rd through six wire winding devices 9 one wire-shaped additive each 7 made of a tungsten alloy. In order to increase the clarity of the illustration, only a wire winding device was again used 9 with the assigned pulleys 10th shown. The insertion of the wire 7 with the insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

in the melt pool 5 takes place skew to the pouring direction GR . To ensure that the additive 7 over the length of the strand 1 always in the strand 1 is present, the component corresponds to the insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

in the casting direction GR the casting speed $\left(\overrightarrow{{\nu }_G}\right),$

To clarify this is to the left of the mold 4th the speed triangle for $\left(\overrightarrow{{\nu }_E}\right),$

and $\left(\overrightarrow{{\nu }_G}\right),$

shown in a representation not to scale. By pulling out the strand 1 in the casting direction GR with the casting speed $\left(\overrightarrow{{\nu }_G}\right),$

and the rotation of the wire winding devices 9 around the longitudinal axis 15 the mold 4th are the additives 7 in the strand 1 of the composite material embedded helically. The contact areas 12th between the additives 7 and the meniscus 6 rotate around the longitudinal axis during continuous casting 15 the mold 4th . In 2nd was just the helical embedding of an additive 7 in the strand 1 shown schematically. By embedding the cold additives 7 into the hot melt of the raw material 2nd points the strand 1 of the composite material at least in the vicinity of the additives 7 a fine structure and thus high strength. The control device 18th , the measuring device 19th and the drive 20th out 1A are also in 2nd available, but were not shown.

The 3rd shows a section through the 2nd manufactured strand 1 of the composite material in a normal plane to the longitudinal direction 15 (shown as a top view of an arrow from behind, which is why only an “x” is visible from the arrow) of the strand 1 . The round strand 1 has a diameter of 100 mm and several, in this case 6 Additives distributed evenly around the circumference of the strand and firmly connected to the base material 7 on. With the additives 7 it can be solid or hollow wires (shown are hollow wires) that are in the melt bath 5 the 2nd have been introduced and in the course of continuous casting the strand 1 form.

In the exemplary embodiments, round strands were obtained by using the method according to the invention 1 produced. However, the process is by no means limited to round strands, but can also be used for rectangular, square, elliptical, but also for so-called “beam-blank” profiles etc. The additive can of course also be used 7 in several layers (e.g. with a round strand 1 on different radii) around the longitudinal axis of the mold cavity. As a result, the composite material has more uniform (mechanical) properties.

Although the invention has been illustrated and described in detail by the preferred exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived therefrom by the person skilled in the art without departing from the scope of protection of the invention.

Reference list

1

Strand of the continuously cast composite

2nd

Raw material

3rd

Mold cavity

4th

Mold

5

Melt pool

6

meniscus

7

Additive

8th

Strand guide

9

Wire winding device

10th

Pulley

11

Dip tube

12th

Contact area

15

Longitudinal direction

16

Strand guide roller

17th

Cooling nozzle

18th

Control device

19th

Measuring device for the casting speed

20th

Drive of the wire winding device

a

distance

GR

Pouring direction

Insertion speed

Casting speed

Claims (13)

Method for the continuous continuous casting of a strand of a continuously cast composite material (1), comprising the following steps: - Filling a liquid, metallic base material (2), preferably a molten steel, into the mold cavity (3) of a mold (4) so that it is inside the mold (4) forms a melt bath (5) with a meniscus (6); - Introducing a solid, preferably wire-shaped, additive (7) at an insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

into the melt bath (5), the additive (7) being introduced obliquely to the casting direction (GR) into the melt bath (5) and the contact area (12) of the additive (7) migrating with the meniscus (6) during the continuous casting; Cooling the melt bath (5) in the cooled mold (4), so that an at least partially solidified strand (1) forms in the mold (4); - Pulling the at least partially solidified strand (1) in the casting direction (GR) out of the mold (4) at a casting speed $\left(\overrightarrow{{\nu }_G}\right),$

being the component of insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

in the pouring direction (GR) of the pouring speed $\left(\overrightarrow{{\nu }_G}\right),$

corresponds; - Supporting, guiding and further cooling the drawn strand (1) in a strand guide (8) following the mold (4). Procedure according to Claim 1 , characterized in that the additive (7) melts at least locally after introduction into the melt bath (5). Procedure according to Claim 1 or 2nd , characterized in that the additive (7) does not melt after being introduced into the melt bath (5). Method according to one of the preceding claims, characterized in that several additives (7) are introduced into the melt bath (5) at the same time. Procedure according to Claim 4 , characterized in that the additives (7) introduced into the melt bath (5) at the same time are at least of two types. Method according to one of the preceding claims, characterized in that the additive (7) outside the edge of the Mold cavity (3) is introduced into the melt bath (5) so that the additive (7) in the composite material (1) is completely embedded in the base material (2). Method according to one of the preceding claims, characterized in that the additive (7) is constructed in several layers. Procedure according to Claim 7 , characterized in that the additive (7) comprises at least one outer layer and a core, and the outer layer (13) and the core (14) have other chemical compositions. Composite, showing - A metallic base material (2), preferably steel, and - One, preferably metallic, additive (7) which is firmly connected to the base material (2), the additive (7) being embedded in a helical shape in the base material (2) and extending over the entire longitudinal extent of the composite material (1). Composite after Claims 9 , characterized in that there are several additives (7) in a normal plane to a longitudinal direction (15) of the composite material (1). Composite after Claim 9 or 10th , characterized in that the composite material has at least one through hole in a normal plane to the longitudinal direction (15) of the composite material (1), which can be produced by the use of a hollow additive (7) in a melt bath (5) in a mold (4) by continuous casting is. Continuous casting machine for the continuous continuous casting of a strand of a continuously cast composite material (1), comprising - a cooled mold (4) with a mold cavity (3) for the continuous casting of a metallic melt; - At least one winding device (9) for winding a wire-shaped additive (7) into the mold cavity of the mold (4), the winding device (9) having a drive (20) for introducing the additive (7) at an adjustable insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

includes; - A strand guide (8) following the mold (4) for supporting, guiding and further cooling the strand (1), the strand guide (8) being a pull-out device (16) for pulling the strand (1) out of the mold (4) Pour direction (GR) includes; - A measuring device (19) for measuring the pull-out speed $\left(\overrightarrow{{\nu }_G}\right),$

the strand (1) from the mold (4); - A control device (18) which is connected in terms of signal technology to the measuring device (19) and the drive (20), so that the component of the insertion speed $\left(\overrightarrow{{\nu }_E}\right),$

in the casting direction (GR) of the pull-out speed $\left(\overrightarrow{{\nu }_G}\right),$

corresponds. Continuous casting machine after Claim 12 , characterized in that the winding device (9) has a rotary drive for rotating the winding device (9) about the longitudinal axis of the mold (4).

Images