DE102013200742A1 - Casting strip of composite material by filling molten steel into cavity of mold such that molten bath is formed with meniscus within mold, introducing additive into bath, and cooling bath such that partially solidified strip is formed - Google Patents

Abstract

The method comprises filling a liquid, metallic base material such as molten steel into a cavity (5) of a mold such that a molten bath is formed with a meniscus within the mold, introducing a solid, wire-shaped and multilevel structured additive with a rate of introduction into the melt bath, cooling the molten bath in the mold such that a partially solidified strip is formed in the mold, extracting the partially solidified strip in as casting direction of the mold with a casting speed, and supporting, guiding and further cooling of the strip in a strip guide. The method comprises filling a liquid, metallic base material such as molten steel into a cavity (5) of a mold such that a molten bath is formed with a meniscus within the mold, introducing a solid, wire-shaped and multilevel structured additive with a rate of introduction into the melt bath, cooling the molten bath in the mold such so that a partially solidified strip is formed in the mold, extracting the partially solidified strip in as casting direction of the mold with a casting speed, and supporting, guiding and further cooling of the strip in a strip guide. A component of the insertion speed in the casting direction corresponds to the casting speed. The additive is introduced parallel to the casting direction in the molten bath. A contact area of the additive moves to the meniscus during the continuous casting. The additive is introduced into the molten bath outside an edge of the mold cavity such that the additive in the composite material is completely embedded into the base material, and comprises an outer layer and a core. The outer layer and the core have different chemical compositions. Independent claims are included for: (1) a composite material; and (2) a device for continuous casting of strip.

Description

Field of engineering

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

State of the art

In continuous casting, a liquid, metallic base material (eg a molten steel) is poured continuously in a mold into an at least partially solidified strand. In this case, the metallic melt is typically introduced through a pouring tube into the mold, whereby a molten bath is formed in the mold. The melt begins to solidify on the side walls of the cooled mold and forms in the mold a teilerstarrten strand with an initially thin strand shell. The strand is continuously drawn out of the mold and supported in the mold following the mold guide, guided and further cooled. As a result, the thickness of the strand shell increases until a completely solidified strand is present.

Due to the relatively slow cooling of the strand in the mold (called primary cooling) and in the subsequent strand guide (called secondary cooling) forms in the strand a relatively coarse-grained microstructure (the so-called. Gießgefüge). Due to this, the continuously cast strand has a relatively low strength. In order to limit the grain growth, although it is known in the strand guide to cool the strand "hard", but even then has the strand to an insufficient strength. Since the strand shell of the partially solidified strand further must have a minimum thickness when pulling out of the mold, the slow cooling in the mold also causes a relatively slow casting speed. Finally, the slow cooling of the strand but also requires a relatively large length (metallurgical length) of the continuous casting machine.

In order to increase the strength of the continuously cast strand, the strand is normally hot rolled after continuous casting. In this case, the continuously cast strand - either by taking advantage of the so-called. Gießhitze immediately after leaving the continuous casting machine, or after cooling and subsequent reheating of the strand - formed by typically several rolling passes. By 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 rolling or deformation structure) and a higher strength.

A disadvantage of this multi-stage production process continuous casting and hot rolling is that thereby the production costs are significantly increased.

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

Summary of the invention

The object of the invention is to overcome the disadvantages of the prior art and to provide a method for continuously casting 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 raw material produced by continuous casting. Another object is to provide a continuous casting machine for carrying out the method according to the invention.

• – Einfüllen eines flüssigen, metallischen Grundstoffs, vorzugsweise einer Stahlschmelze, in den Formhohlraum der Kokille, sodass sich innerhalb der Kokille ein Schmelzenbad mit einem Meniskus ausbildet;
• – Einführen eines festen, vorzugsweise drahtförmigen, Zusatzstoffes mit einer Einführgeschwindigkeit
  
  in das Schmelzenbad;
• – 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 continuously casting a strand of a continuously cast composite, comprising the following steps:

• - Introducing a liquid, metallic base material, preferably a molten steel, into the mold cavity of the mold, so that forms a melt bath with a meniscus within the mold;
• - Introducing a solid, preferably wire-shaped, additive with an insertion speed
  
  in the melt bath;
• Cooling the melt bath in the cooled mold, so that an at least partially solidified strand is formed in the mold;
• - Extracting the at least partially solidified strand in the casting direction from the mold at a casting speed
  
  the component being the casting speed
  
  in the casting direction of the insertion speed
  
  corresponds;
• - Supporting, guiding and further cooling of the drawn strand in one of the mold subsequent strand guide.

des Zusatzstoffes in der Gießrichtung der Gießgeschwindigkeit

mit der der zumindest teilerstarrte Strang des Verbundwerkstoffs aus der Kokille ausgezogen wird. Mathematisch ausgedrückt heißt dass, dass das skalare Produkt der Einführgeschwindigkeit

mit dem Einheitsvektor in Gießrichtung dem Betrag der Gießgeschwindigkeit entspricht. Der ausgezogene Strang des Verbundwerkstoffs wird in bekannter Weise in der der Kokille nachfolgenden Strangführung gestützt, geführt und weiter abgekühlt.In the process according to the invention is per se in a known manner, a liquid, metallic Base material cast in a continuous casting mold of a continuous casting machine. The base material (for example a molten steel steel) is introduced as a melt, typically from a tundish, via a pouring tube (for example a submerged entry nozzle) into the mold cavity of the cooled mold, resulting in an inside of the mold cavity Mold forms a melt bath with a meniscus. According to the invention, a solid, preferably wire-shaped and metallic, additive is additionally introduced into the melt bath at an introduction speed. As a result of the cooling of the melt bath in the cooled mold, a strand which is partially solidified or solidified subsequently forms in the casting mold (vertically in a so-called vertical installation, substantially perpendicular in a so-called sheet system with a curved mold or horizontally in a so-called. Horizontal system) is pulled out with a casting speed from the mold. By introducing the additive with the introduction speed into the melt bath, a composite material (also called composite material, ie composite material or composite material) is already formed in the mold, ie a material consisting of two or more interconnected materials. In order to ensure the influence of the additive over the longitudinal extent of the continuously cast composite, the component corresponds to the insertion speed

of the additive in the casting direction of the casting speed

with which the at least partially solidified strand of the composite material is extracted from the mold. Expressed mathematically, that means that the scalar product is the insertion speed

with the unit vector in the casting direction corresponds to the amount of casting speed. The solid strand of the composite material is supported in a known manner in the mold guide subsequent to the mold, guided and further cooled.

In a simple embodiment, the additive is introduced into the melt bath parallel to the casting direction. The insertion speed corresponds to the casting speed.

In an alternative embodiment, the additive is introduced askew to the casting direction in the melt bath, wherein the contact area of the additive with the meniscus migrates during continuous casting. This makes it possible to use the additive -. Along a continuous or variable pitch helix - in the strand so that the strand of the composite has more uniform longitudinal properties.

A particularly intimate connection between the base and the additive is achieved when the additive melts at least locally after introduction into the melt bath. It can be z. B. melt only one outer layer of the additive in the melt bath.

Alternatively, it is of course also possible to introduce an additive which does not melt after being introduced into the melt bath, wherein z. For example, the additive has a higher melting point than the base (eg, a tungsten wire-type additive introduced into a molten steel base stock). It may be immediately obvious that the use of a high-melting additive, which has a high strength, can increase the strength of the continuously cast composite material. However, even by using a similar additive (eg steel base and additive), a substantial increase in the strength of the continuously cast composite material is achieved. This is due to the fact that the composite material by the use of the cold additive in the hot melt bath at least locally - d. H. in the vicinity of the additive - has a much finer structure, whereby the strength of the composite material is increased.

Particularly well know the properties of the composite material can be adjusted if the additive is multi-layered. For example, the outer layer may be alloyed differently than the core, such that the outer layer forms an intimate solid alloy together with the base. For this purpose, it is expedient for the core to have the outer layer of the additive other chemical compositions. For example, 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 several additives either know to be similar, or - z. Depending on the expected load on the composite material - different (i.e., at least of two types - this is intended to encompass different chemical compositions, different diameters ...). As a result, the properties of the composite material can be adjusted specifically.

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

The strand-like composite material which can be produced by the process according to the invention comprises a metallic base material, preferably steel, and a, preferably metallic, additive, which is firmly bonded to the base material, wherein the additive is embedded helically in the base material, and the Additive 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 several additives are present in a normal plane to the longitudinal direction of the composite material. As a result, the composite material also has relatively uniform mechanical properties in the normal direction.

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

• – 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 weiterem 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 continuously casting a metallic melt;
• - At least one Einspuleinrichtung for winding a wire-shaped additive into the mold cavity of the mold, wherein the Einspuleinrichtung a drive for introducing the additive with an adjustable insertion speed
  
  includes;
• A strand guide subsequent to the mold for supporting, guiding, and further cooling the strand, the strand guide comprising a drawing-out device for drawing the strand out of the mold in the casting direction;
• - A measuring device for measuring the extraction speed
  
  the strand from the mold;
• - A control device, which is technically connected to the measuring device and the drive, so that the component of the insertion speed
  
  in the casting direction of the extraction speed
  
  equivalent.

For producing a composite material in which the additive is embedded in a helical manner, it is expedient for the winding device of the continuous casting machine to comprise a rotary drive for rotating the winding device about the longitudinal axis of the mold.

Brief description of the drawings

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

1A and 1B : An elevation and a sectional plan view of the Kokillenbereichs a first embodiment of a continuous casting machine for performing the method according to the invention

2 : A sectional view of the Kokillenbereichs a second embodiment of a continuous casting machine for carrying out the method according to the invention

3 : A sectional view through a strand according to the invention of the continuously cast composite material

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 sog. 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 mit einer Einführgeschwindigkeit

in das Schmelzenbad 5 eingeführt die der Gießgeschwindigkeit

(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 chem. Zusammensetzung eine wesentlich höhere Festigkeit aufweist. Die in 1A dargestellte Regeleinrichtung 18 stellt sicher, dass die Komponente der Einführgeschwindigkeit

in Gießrichtung GR der mittels der Messeinrichtung 19 gemessenen Gießgeschwindigkeit

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 continuously casting a strand 1 of a continuously cast composite material. In the continuous casting of the strand 1 becomes a basic material 2 in the form of a molten steel from a Gießverteiler, not shown, which is above a mold 4 the casting machine is arranged over a pouring tube 11 into the mold cavity 3 the mold 4 filled. In the case shown is the mold 4 formed as a water-cooled tube mold having a round mold cavity 3 having a diameter of 100 mm. By filling the molten steel into the mold 4 forms in the mold cavity 3 a melt bath 5 with a meniscus 6 out. It also has several wire winding devices 9 and deflection units with internal pulleys 10 a solid, wire-shaped additive 7 in the form of a steel wire with a diameter of 3 mm with an insertion speed

in the melt bath 5 introduced; the steel wire 7 is introduced parallel to the casting direction GR. To avoid unnecessarily complicating the presentation, only a single wire winding device has been used 9 shown; the other six wire winding devices 9 are the same design and in the radial direction while maintaining a uniform angular displacement about the longitudinal axis of the mold 4 distributed. By cooling the melt bath 5 in the cooled mold 4 forms in the mold 4 a partially solid strand 1 of the composite material, by non-illustrated driven strand guide rollers from the mold 4 is pulled out. As usual with continuous casting machines, the driven ones are Strand guide rollers (also called drive rollers) in the mold 4 subsequent strand guide. The wire-shaped additive 7 has a non-smooth surface structure - similar to that of a so-called. Reinforcing steel - whereby the surface of the additive 7 is increased at the same diameter. To ensure uniform properties of the composite material 1 in casting direction GR, the additive is introduced at an introduction speed

in the melt bath 5 introduced the casting speed

(also called extraction speed) corresponds. By using the raw material (molten steel) 2 similar additive (steel wire) 7 at least melts the surface of the steel wire 7 in the melt bath 5 on, creating an intimate connection between basic and additive 2 . 7 is ensured. Due to the locally different cooling of the hot melt 2 through the steel wire 7 , rejects the strand 1 of the composite, at least in the area of the melted steel wire 7 a much finer microstructure, so that the strand produced by the inventive method 1 compared to conventional continuously cast strands with the same chem. Composition has a much higher strength. In the 1A illustrated control device 18 Make sure the component is the insertion speed

in the casting direction GR by means of the measuring device 19 measured casting speed

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

The 1B shows a section along the section line AA of 1A , It can be seen that the additives 7 each a distance a to the edge of the mold cavity 3 the mold 4 exhibit. During continuous casting, the contact area migrates 12 between the additive 7 and the meniscus 6 Not.

The strand thus produced 1 of the composite material is after the mold 4 supported in a conventional manner in the vertical strand guide, not shown, guided and further cooled by means of cooling nozzles (see also 2 in which a part of the strand leadership 8th , the roles 16 and the cooling nozzles 17 are shown). After the solidification of the strand 1 separated and discharged from the continuous casting machine. After discharging, the strand 1 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

in Gießrichtung GR der Gießgeschwindigkeit

Zur Verdeutlichung in dessen ist links neben der Kokille 4 das Geschwindigkeitsdreieck für

und

in einer nicht maßstabsgerechten Darstellung gezeigt. Durch das Ausziehen des Strangs 1 in Gießrichtung GR mit der Gießgeschwindigkeit

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 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 2 shows a further embodiment of a section of the continuous casting machine for carrying out the method according to the invention. This is in a tube mold 4 with a round mold cavity 3 through six wire winding devices 9 one wire-shaped additive each 7 made from a tungsten alloy. In order to increase the clarity of the presentation, in turn only a wire winding device with the associated pulleys 10 shown. The insertion of the wire 7 with the insertion speed

in the melt bath 5 is skewed to Gießrichtung GR. To make sure the additive 7 over the longitudinal extent of the strand 1 always in a line 1 is present, the component corresponds to the insertion speed

in the casting direction GR of the casting speed

For clarity in the left of the mold 4 the speed triangle for

and

shown in a representation not to scale. By pulling the strand 1 in the casting direction GR with the casting speed

and the rotation of the wire winding means 9 around the longitudinal axis 15 the mold 4 , are the additives 7 in the strand 1 of the composite embedded helically. The contact areas 12 between the additives 7 and rotate the meniscus during continuous casting around the longitudinal axis 15 the mold 4 , In 2 was merely 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 2 has the strand 1 of the composite at least in the environment of the additives 7 a fine structure - and thus a high strength - on. The control device 18 , the measuring device 19 and the drive 20 out 1A are also in 2 but not shown.

The 3 shows a section through the according to 2 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 one "x" of the arrow is visible) of the strand. The round strand 1 has a diameter of 100 mm and has several, in this case 6 pieces evenly distributed around the circumference of the strand, firmly attached to the base material, additives 7 on. For the additives 7 they can be solid or hollow wires (shown are hollow wires), which are in the melt bath 5 of the 2 have been introduced and in the course of continuous casting the strand 1 form.

In the embodiments, the use of the method according to the invention were each round strands 1 produced. However, the method is by no means limited to round strands, but rather also for rectangular, square, elliptical but also for so-called. "Beam-blank" profiles, etc. applicable. Furthermore, it is of course also possible for the additive to be distributed in several layers (for example in a round strand at different radii) around the longitudinal axis of the mold cavity. As a result, the composite has more uniform (mechanical) properties.

While the invention has been further illustrated and described in detail by the preferred embodiments, 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 invention.

LIST OF REFERENCE NUMBERS

• 1 Strand of the continuously cast composite material
• 2 raw material
• 3 mold cavity
• 4 mold
• 5 melt bath
• 6 meniscus
• 7 additive
• 8th strand guide
• 9 Drahteinspuleinrichtung
• 10 idler pulley
• 11 dip tube
• 12 contact area
• 15 longitudinal direction
• 16 Strand guide roller
• 17 cooling nozzle
• 18 control device
• 19 Measuring device for the casting speed
• 20 Drive of the wire winding device
• a distance
• GR casting direction
• 
  feeding speed
• 
  casting speed

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2011/117296 A1 [0006]

Claims (15)

Method for continuously casting 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 the mold ( 4 ), so that within the mold ( 4 ) a melt bath ( 5 ) with a meniscus ( 6 ) trains; Introducing a solid, preferably wire-shaped, additive ( 7 ) with an insertion speed

into the melt bath ( 5 ); Cooling the melt bath ( 5 ) in the cooled mold ( 4 ), so that in the mold ( 4 ) an at least partially solidified strand ( 1 ) trains; - Extracting the at least partially solidified strand ( 1 ) in the casting direction (GR) from the mold ( 4 ) with a casting speed

the component being the insertion speed

in the casting direction (GR) of the casting speed

corresponds; - supporting, guiding and further cooling of the drawn strand ( 1 ) in one of the mold ( 4 ) subsequent strand guide ( 8th ) Process according to claim 1, characterized in that the additive ( 7 ) parallel to the casting direction (GR) in the melt bath ( 5 ) is introduced. Process according to claim 1, characterized in that the additive ( 7 ) skewed to the casting direction (GR) in the melt bath ( 5 ), the contact area ( 12 ) of the additive ( 7 ) with the meniscus ( 6 ) migrates during continuous casting. Method according to one of claims 1 to 3, characterized in that the additive ( 7 ) after introduction into the melt bath ( 5 ) melts at least locally. Method according to one of claims 1 to 3, characterized in that the additive ( 7 ) after introduction into the melt bath ( 5 ) does not melt. Method according to one of the preceding claims, characterized in that at the same time several additives ( 7 ) in the melt bath ( 5 ) are introduced. A method according to claim 6, characterized in that at the same time in the melt bath ( 5 ) ( 7 ) are at least of two kinds. Method according to one of the preceding claims, characterized in that the additive ( 7 ) outside the edge of the mold cavity ( 3 ) in the melt bath ( 5 ), so that the additive ( 7 ) in the composite material ( 1 ) completely in the raw material ( 2 ) is embedded. Method according to one of the preceding claims, characterized in that the additive ( 7 ) is multi-layered. Process according to claim 9, 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 material comprising - a metallic base material ( 2 ), preferably steel, and - a, preferably metallic, additive ( 7 ), with the basic substance ( 2 ), the additive ( 7 ) helically in the base material ( 2 ) and the additive extends over the entire longitudinal extent of the composite material ( 1 ). Composite material according to claim 11, characterized in that in a normal plane to a longitudinal direction ( 15 ) of the composite material ( 1 ) several additives ( 7 ) are present. Composite material according to one of claims 11 or 12, characterized in that the composite material in a normal plane to the longitudinal direction ( 15 ) of the composite material ( 1 ) has at least one through hole that through the use of a hollow additive ( 7 ) in a melt bath ( 5 ) in a mold ( 4 ) can be produced by continuous casting. Continuous casting machine for continuously casting a strand of a continuously cast composite material ( 1 ), comprising - a cooled mold ( 4 ) with a mold cavity ( 3 ) for continuously casting a metallic melt; At least one rewinding device ( 9 ) for winding a wire-shaped additive ( 7 ) in the mold cavity of the mold ( 4 ), wherein the Einspuleinrichtung ( 9 ) a drive ( 20 ) for introducing the additive with an adjustable insertion speed

includes; - one of the mold ( 4 ) subsequent strand guide ( 8th ) for supporting, guiding, and further cooling the strand, wherein the strand guide ( 8th ) an extraction device ( 16 ) for pulling the strand ( 1 ) from the mold ( 4 ) in the casting direction (GR); A measuring device ( 19 ) for measuring the extraction speed

of the strand ( 1 ) from the mold ( 4 ); - a control device ( 18 ), which is technically signaled with the measuring device ( 19 ) and the drive ( 20 ), so that the component of the insertion speed

in the casting direction of the extraction speed

equivalent. Continuous casting machine according to claim 14, characterized in that the rewinding device ( 9 ) a rotary drive for rotation of the winding device ( 9 ) about the longitudinal axis of the mold ( 4 ) having.

Images