Abstract: A method and a device for continuous or semi-continuous casting of metal, where hot melt is supplied to a cooled continuous casting mold and the melt is cooled and formed to a at least partly solidified strand as it passes through the mold. An inductive coil is arranged at the top end of the mold to, when supplied with an alternating electric high frequency current, generate a high frequency magnetic field to act upon the melt in the mold, whereby heat is developed in the melt and compressive forces acting to separate the melt from the mold wall are generated. The coil is supplied with the high frequency current from a power supply unit with a current control to supply an alternating electric high frequency current having a base frequency of 50 Hz or more to the inductive coil. The current control has modulation means for modulating and controlling the supplied current is controlled in a pulsed, amplitude modulated manner with an amplitude modulated modulation frequency of 10 Hz.

Abstract: The present invention provides a continuous casting method in which vibration is given to molten metal by a shifting magnetic field so that the equi-axed crystal ratio can be enhanced and the equi-axed crystals can be made fine without generating surface defects caused by powder trapping. Further, the present invention provides an apparatus to which the continuous casting method is applied. Furthermore the present invention provides a cast slab produced by the above method and apparatus.

Abstract: Method and apparatus for continuous casting, especially casting of steel that can easily provide high quality steel that has no central segregation and central porosity.

Abstract: The method for controlling flow pattern of molten steel in continuous casting, comprises the steps of: (a) continuously casting a molten steel injected through an immersion nozzle; (b) measuring temperatures of a copper plate on longer side of the mold in width direction thereof at plurality of points; (c) detecting a flow pattern of the molten steel in the mold based on the time-sequential variations of temperatures of the copper plate at individual measurement points; and (d) controlling the flow pattern to establish a specified pattern on the basis of the detected result. The temperatures of mold copper plate are measured by plurality of temperature measurement elements buried in the rear face of the mold copper plate for continuous casting. The temperature measurement elements are arranged in a range of from 10 to 135 mm distant from the melt surface in the mold in the slab-drawing direction.

Abstract: An apparatus for providing a magnetic field in a casting mold to slow and redirect in a controllable fashion the flow of liquid steel exiting from a submerged entry nozzle into the casting mold uses selectable removable ferromagnetic and non-magnetic laminar elements stackable on the ends of core fingers in the vicinity of the poles of an electromagnetic yoke positioned adjacent the mold face. By selecting the type and location of the stackable elements on the ends of the fingers, one can modify the properties of the magnetic field permeating the interior of the mold. Optionally, independent field coils may be provided for energizing selected portions of the magnetic field core structure to provide further magnetic field control without having to remove and replace laminar elements.

Abstract: An apparatus for providing a magnetic field in a casting mold to slow and redirect in a controllable fashion the flow of liquid steel exiting from a submerged entry nozzle into the casting mold uses selectable removable ferromagnetic and non-magnetic laminar elements stackable on the ends of core fingers in the vicinity of the poles of an electromagnetic yoke positioned adjacent the mold face. By selecting the type and location of the stackable elements on the ends of the fingers, one can modify the properties of the magnetic field permeating the interior of the mold. Optionally, independent field coils may be provided for energizing selected portions of the magnetic field core structure to provide further magnetic field control without having to remove and replace laminar elements.

Abstract: In a magnetic brake apparatus for a continuous casting mold having a pair of first and second upper electromagnets 17A and 17B which are oppositely placed near the rear faces of the opposing side walls of the continuous casting mold 10, and a pair of first and second lower electromagnets 21A and 21B which are oppositely placed thereunder, a static magnetic field being generated between each pair of electromagnets to stem the stream of the molten steel supplied to the casting mold by the static magnetic field, the apparatus has controlling units which independently control a current supplied to magnetic coils 16A and 16B being constituents of the first and second upper electromagnets and a current supplied to magnetic coils 20A and 20B being constituents of the first and second lower electromagnets.

Abstract: A chill mold for the simultaneous casting of two parallel strands and a magnetic brake which generates at least one static or periodic low frequency magnetic field. The chill mold includes a rectangular casting mold and an inner partition which subdivides the rectangular casting mold into two sub-molds, and the magnetic field acts with essentially the same magnetic field direction across the entire width of the rectangular casting mold and has an essentially symmetrical distribution in both sub-molds. The brake includes a first magnet at a first long side of the rectangular casting mold and a second magnet of opposite polarity at the opposite second long side of the rectangular casting mold. The magnetic material in the first and second magnets is distributed such that both magnets have two magnetic sub-poles of the same polarity arranged adjacent to each other along each of the two long-sides of the rectangular casting mold.

Abstract: Continuous casting machine for the continuous casting of molten steel into a cast product, comprising a mold in which the molten steel is poured through an exit port of a nozzle, forming a bath of molten metal, and in which at least part of the metal is solidified, whereby the continuous casting machine is provided with control means for controlling the flow of molten steel and operative on the molten steel after entering the mold such that the flow pattern of the molten steel in the mold is basically symmetrical with respect to at least one plane of symmetry of the mold.

Abstract: A billet continuous casting machine comprises, and a billet continuous casting method uses, a jacket for cooling an outer wall of a quadrangular tubular mold with cooling water, electromagnetic brakes disposed outside the mold for decelerating the flow speed of poured molten metal in the mold, an X ray-based level sensor for detecting the level of molten metal in the mold, notched portions formed at the corners of a quadrangular lower part of the mold, spray nozzles for spraying a cooling liquid directly onto the notched portions, and elastically pushing means for imparting a pushing force corresponding to the static pressure of the molten metal to unnotched portions of the quadrangular lower part of the mold to push the unnotched portions inwardly of the mold, whereby molten metal is continuously poured into the cooled mold to solidify the molten metal so that a cast piece quadrangular in cross section is continuously produced.

Abstract: A continuous casting method, and a device for use in the casting method, are disclosed. The flow state of the discharged molten metal is properly controlled, and thus, the amounts of residual non-metallic inclusions and gas bubbles within the molten metal are decreased, so that continuously cast slabs of a good quality can be produced. The continuous casting device includes a mould with a submerged nozzle installed therein, the submerged nozzle having a pair of discharge holes directed toward narrow faces of the mould. Further, an electromagnetic brake ruler is included for establishing a magnetic field within the mould. The electromagnetic brake ruler includes a base frame surrounding the mould, and iron cores projecting from near the wide faces of the mould, while the iron cores are wound with induction coils.

Abstract: A device, for continuously or semicontinuously casting of metal in a casting mould, for braking and splitting up a primary flow of hot melt supplied to a casting mould, and controlling the flow of melt in the non-solidified portions of a cast strand which is formed in the casting mould. The device comprises a plurality of water box beams which support and cool the casting mould and supply a coolant to the casting mould, and a magnetic brake. The magnetic brake is adapted to generate at least one static or periodic low-frequency magnetic field to act in the path of the inflowing melt and comprises at least one magnet to generate the magnetic field, at least one core to transmit the magnetic field to the casting mould and a cast strand, and at least one magnetic return path to close the magnetic circuit. The water box beam is completely or partially arranged in a magnetically conducting material.

Abstract: A method of continuously casting molten metal has the step of feeding molten metal into a mold to produce a casting continuously while generating an electromagnetic field in the mold by applying a high frequency to the mold. The application of the high frequency is controlled in such a manner that a magnitude of an electromagnetic field which is applied to a solidification shell forming start location of the mold becomes equal to or greater than a minimum required flux density to be applied to the mold. The minimum required flux density is determined according to the following equation: 1 B min = 1130 × t n - 5 ⁢ f × ( t n - 0.

Abstract: Method and apparatus for continuous casting, especially casting of steel that can easily provide high quality steel that has no central segregation and central porosity.

Abstract: Both an apparatus and method are provided for electromagnetically braking a flow of molten metal during a continuous casting operation. The apparatus includes an electric electromagnetic inductor of the traveling-magnetic-field polyphase stator-type connected to a source of electrical power. The inductor is mounted on a casting plant opposite one face of the product being cast, and has two or three phase windings. The electrical power supply of the apparatus includes two or three elementary DC sources, each of which can be adjusted in terms of current intensity independent of one another. Each of the elementary electrical DC sources is connected to one, and only one of the phase windings of the inductor. The arrangement of the apparatus allows a flow of molten, ferromagnetic metal such as steel to be adjustably braked by merely adjusting the parameters of the source of electrical supply.

Abstract: A billet continuous casting machine comprises, a jacket for cooling an outer wall of a quadrangular tubular mold with cooling water, electromagnetic brakes disposed outside the mold and decelerating the flow of poured molten metal in the mold, an X ray-based level sensor for detecting the level of molten metal in the mold, notched portions formed at the corners of a quadrangular lower part of the mold, spray nozzles for spraying a cooling liquid directly onto the notched portions, and elastically pushing unit for imparting a pushing force corresponding to the static pressure of the molten metal to unnotched portions of the quadrangular lower part of the mold to push the unnotched portions inwardly of the mold, whereby molten metal is continuously poured into the cooled mold to solidify the molten metal so that a cast piece quadrangular in cross section is continuously produced. Delay in solidification at sites near the corners of the cast piece is eliminated, and high quality, high speed casting is realized.

Abstract: An apparatus for providing a magnetic field in a casting mold to slow and redirect in a controllable fashion the flow of liquid steel exiting a submerged entry nozzle in the casting mold using removable laminar elements arrangeable in a horizontal series of vertical stacked arrays in association with corresponding side-by-side laminar constituents of the magnetic field core, or independent field coils for energizing each laminar portion of the magnetic field core, or both. The removable elements are preferably stackable rectangular parallelepiped plates together forming selectably a portion or all of the poles of the core as they extend into proximity with the transverse mold sides at selected locations.

Abstract: Crystalliser for the continuous casting of billets, blooms, slabs and round bars, whether the crystalliser be of the plate type or substantially tubular, having cooled sidewalls (11) which include, in at least one longitudinal area, at least one perimeter area with electrical insulation elements (19) defining two electrically insulated ends, the sidewall of the crystalliser (10) included between the aforesaid two insulated ends having an electrical continuity, the ends being associated to electrical feed means (22) governed by a power supply system able to generate electromagnetic waves, defined and desired, interacting at least with the forming skin of the cast metal (12).

Abstract: Permanent-magnetic hydrodynamic methods and apparatus stabilize a moving, flexible, thin-gauge, heat-conducting, magnetically soft ferromagnetic casting belt against thermal distortion while moving along a mold cavity being heated at its front surface by heat coming from molten metal being cast while being cooled at its reverse surface by flowing pumped liquid coolant. Hydro-magnetic devices are arranged in an array wherein flows of pumped coolant pass through fixedly throttling passageways feeding pressure pockets facing the belt's reverse surface. These pockets are shown rimmed by magnetic pole faces. Coolant issues from the pressure pockets as fast-moving films radiating therefrom and travelling in gaps between the belt's reverse surface and the pole faces.

Abstract: Method and apparatus for retarding a flow of molten metal to a metal caster. The flow of molten metal is confined within a duct 11 having an elongate cross-section transverse to the flow directions to shape the flow in a sheet formation. The sheet formation flow is subjected to a magnetic field extending through the flow transversely of the sheet formation and varying sinusoidally along the flow direction whereby to induce circulating electric currents in the molten metal which interact with the magnetic field to produce forces on the molten metal which retard the flow. The magnetic field may be induced by two sets 13 of permanent magnets 14 spaced one set to either side of the duct 11, the magnets 14 of each set being spaced along the flow direction and being of successively opposite magnetic polarity.

Abstract: In producing thin slabs by continuous casting, a method is developed in which internal defects are reduced to improve a production yield. Narrow sides of cast slabs are cooled in a controlled manner to produce cast slabs having a projection in a center of each of the narrow sides to a height of 5-10 mm above the level of the edge portions, and squeeze reduction with a reduction of 10-45% is carried out while an unsolidified portion of the narrow sides of the slab is within 50-80% of the thickness of the cast slab.

Abstract: Twin roll casting of metal strip by introducing molten metal between chilled casting rolls (16) to form casting pool supported on the rolls and confined by refractory end closures (56), and rotating the rolls (16) so as to cast a solidified strip delivered downwardly from the nip between the rolls (16). Prior to casting refractory end closures (56) are preheated by positioning adjacent their inner faces a pair of metal plates (130) and exposing those plates to electromagnetic fields to cause them to rise in temperature and so heat the closures (56). Plates (130) have hooked top flanges (131) for location on the refractory end closures (56).

Abstract: To give vibration to molten metal in a melt pool to enhance solidification efficiency of the molten metal.Substantially directly above meniscus 14 between molten metal 5 in a melt pool 4 and each of rolls, an AC electromagnet 15 is arranged over the entire length of said meniscus 14 so that magnetic flux runs substantially perpendicular to a surface of the molten metal. Above the AC electromagnet 15, a DC electromagnet 16 is arranged over the entire length of the AC electromagnet 15 so that magnetic flux runs substantially perpendicular to the surface of the molten metal. Under application of DC magnetic field by means of the DC electromagnet 16, an AC magnetic field is applied near the meniscus 14 between the molten metal 5 in the melt pool 4 and each of the rolls 1 and 2. As a result, induction current is generated in the molten metal 5 and high frequency vibration is applied to the molten metal 5 by Lorentz's force due to interaction between the induction current and the DC magnetic field.

Abstract: A device for slowing down the non-solidified portions of a cast strand during continuous casting of billets or blooms. The device comprises a group of at least three separate molds (1-4) which are open in the direction of casting and which are arranged such that each one is supplied with a flow of melt. The device also comprises a number of magnetic core parts (5-8), and at least one magnetic-field generating member (9-13), adapted to generate and transfer, together with the magnetic core parts, a static magnetic field or a periodic low-frequency magnetic field to the inflowing melt in such a way that the movement of the melt is slowed down. The magnetic core parts and the magnetic-field generating members are arranged such that, together with all the molds in the group, they form a common closed magnetic circuit. All the molds included in the group are arranged in series with each other in the closed magnetic circuit.

Abstract: An object of the present invention is to provide a process for continuously casting a molten metal which process suppresses the instability of the initial solidification and stably improves the lubrication and the surface properties of the cast metal, and an apparatus therefor, in the process for continuously casting a molten metal an alternating current is applied to an electromagnetic coil which is provided so that it surrounds a continuous casting mold wall or is embedded in the side wall of the mold, whereby an electromagnetic force is exerted on the molten metal poured into the mold which either oscillates in a constant mode or does not oscillate and is starting to be solidified the process of the present invention also comprises periodically changing the amplitude or waveform of the alternating current to be applied, and the apparatus of the present invention is used for the process.

Abstract: A device for continuously manufacturing a cast strand by continuous casting of liquid metal melt wherein the flow of the liquid metal in the non-solidified portions of the strand is controlled by means of a static or periodic low-frequency magnetic field. A mould adapted to be supplied with the melt includes copper plates (2a,2b) which form a casting mould space with a rectangular cross section, water box beams (3) which are arranged outside the copper plates to support and cool them, and a member (4) holding the mould together. Magnetic field-generating devices, i.e., magnets, are provided close to the mould to generate a static or periodic low-frequency magnetic field which acts in the path of the inflowing melt and divides the primary flow as well as checks any secondary flows arising. Each magnet comprises a front core (5), a rear core and a coil (7).

Abstract: The present invention provides a method, for regulating the flow of a molten steel within a mold by taking advantage of a direct current magnetic field, comprising the step of carrying out continuous casting while regulating the flow of a molten steel, delivered through a nozzle, by applying a direct current magnetic field having a substantially uniform magnetic flux distribution over the whole width direction of the mold, characterized in that the flow velocity of a meniscus on the surface of the molten steel within the mold is regulated in a range of from 0.20 to 0.40 m/sec by regulating the molten steel delivery angle of the nozzle, the position of the magnetic field, and the magnetic flux density.

Abstract: When molten steel jetted through an immersion nozzle into a mold for continuous casting is controlled by applying static field between opposed side walls of the mold for the continuous casting, this invention provides cast slabs having good surface and internal qualities by feeding molten steel to the mold for the continuous casting at a throughput of not less than 6 t/min and simultaneously applying a static field having a magnetic flux density of at least 0.5 T to a meniscus portion in the mold for the continuous casting and a static field having a magnetic flux density of not less than 0.5 T to a lower portion of molten steel jetted out from a discharge port of the immersion nozzle.

Abstract: A continuous casting plant for casting thin slabs includes an electromagnetic decelerating unit for the molten steel which flows into the mold through a submerged casting pipe. The electromagnetic decelerating unit is composed of a coil with a ferromagnetic core arranged on each of the long sides of the mold and a yoke surrounding the mold. The cores on the long sides of the mold each are composed of a principal core and a partial core on the side of the cast strand, wherein different partial cores can be used as desired for adapting the magnetic field to changing casting conditions.

Abstract: A process for continuously casting steel slabs employing a molten steel containing an oxygen concentration of 30 ppm or less, preferably, 20 ppm or less, using a straight immersion nozzle to which an inert gas is not injected, and disposing a static magnetic field generator on the back surface of the mold for applying the strong static magnetic field to the molten steel within the mold, thereby restricting the flow of the molten steel. With this process, it is possible to prevent the nozzle blocking, and hence to obtain the steel slabs excellent in the internal and surface qualities.

Abstract: A method and a device for controlling the flow of the molten metal in non-solidified portions of a cast strand in connection with casting of metal. A mould (11) is supplied with at least one primary flow (20) of molten metal and at least one strand (1) is formed in the mould. At least one static or periodic low-frequency magnetic field (10) is applied to act with a maximum magnetic field strength in the mould exceeding 1000 Gauss in the path of the inflowing molten metal to brake and divide the primary flow (20) of molten metal flowing into the mould and to control any secondary flows (21, 22) arising.

Abstract: One or more streams of molten metal poured into a continuous casting mold are acted on magnetically by static magnetic fields, covering substantially the entire width of the casting mold, thereby reducing the speed of the molten metal streams from the immersion nozzle, unifying the flow profile of the molten metal in the mold, preventing trapping and accumulating of mold powders and inclusions into the cast products. Magnetic poles are provided which are at least as wide as or wider than the minimum width of the cast products and the iron core is arranged on the same face of the casting mold with mutually opposite polarities in the drawing direction. Even if casting conditions change from time to time, defects in final products made of the cast metal are substantially reduced.

Abstract: A process of reducing macrosegregation in the casting of a metal alloy ingot is disclosed.

Abstract: An electromagnetic braking apparatus for a continuous casting mold comprises a casting mold with a rectangular cross section including wide side walls and narrow end walls; electromagnets each of which comprises a core disposed along the side wall of the casting mold and a coil wound around the core for applying a magnetic field in the direction across the side walls of the casting mold; and a support frame for supporting a width changing device for changing the width of the casting mold and cooling boxes for cooling the casting mold, the support frame extending to surround the casting mold and the electromagnets and connected to the cores of the electromagnets to thereby form the magnetic path of the electromagnets.

Abstract: A method for continuous casting of a slab comprises feeding molten steel into a mold through exit ports of an immersion nozzle and controlling a stream of the molten steel by means of an electromagnetic stirrer having a linearly shifting magnetic field. The direction of the linearly shifting magnetic field is toward the immersion nozzle, which is positioned at the center of the mold from a pair of narrow sides of the mold. A first frequency control step controls a frequency of a wave of the shifting magnetic field to be higher than a threshold frequency, wherein the wave has a period equal to the time during which the stream of the molten steel poured from the immersion nozzle passes through an area to which the linearly shifting magnetic field is introduced, said area having an upper limit and a lower limit.

Abstract: Two kinds of molten steels are poured into a continuous casting mold. Direct current magnetic flux is applied which direct current magnetic flux extends in a direction transverse to the thickness (corresponding to the thickness of a casting slab) of the poured content at a position of a certain height of the mold. The molten steels are supplied above and below a boundary of static magnetic fields formed by the direct current magnetic flux longitudinally or in a casting direction. When a difference (.DELTA..rho.) between a density .rho..sub.1 of the molten steel for an outer layer supplied above the static magnetic fields and a density .rho..sub.2 of the molten steel for an inner layer supplied below the static magnetic fields, is expressed by .DELTA..rho.=.rho..sub.1 -.rho..sub.2 (g/cm.sup.3), a density (tesla) of the direct current magnetic flux is determined by the following formula:a) in case of .DELTA..rho.<0B.gtoreq.[2.83.times.(.DELTA..rho.).sup.2 +1.68.times..DELTA..rho.+0.30]b) in case of 0.ltoreq.

Abstract: In a continuous casting of steel slab, a molten steel is provided having an oxygen concentration of not more than 35 ppm and is supplied from a tundish into a continuous casting mold through a straight immersion nozzle having an open end at the forward end thereof, the mold consisting of a combination of a pair of narrow face mold walls and a pair of wide face mold walls. A traveling magnetic field generating device is disposed on a central area of the outer surface of the wide face mold walls. While the open forward end of the nozzle is positioned in the magnetic field region of the traveling magnetic field generating device, a traveling magnetic field which is perpendicular to the wide face mold walls and which is traveling upward is applied to a flow of the molten steel discharged from the nozzle, thereby controlling the flow. Preferably, an upper or lower static magnetic field generating device or both of them may be also used.

Abstract: A process of reducing macrosegregation in the casting of a metal alloy ingot is disclosed. The process includes introducing a molten metal alloy into a casting mold cavity, cooling the molten metal alloy to form a solid zone, a liquid-solid mushy zone overlying the solid zone, a liquid zone overlying the liquid-solid mushy zone and a melt surface on the liquid zone, employing during the cooling at least one substantially static magnetic field having at least two planes of symmetry which intersect on the longitudinal axis of the ingot, generating the magnetic field by at least one coil means having an inner region through which the metal alloy passes, energizing the coil means by a substantially static electrical current wherein the current follows a path defined by the coil means and passes around at least one of the molten metal alloy and the zones, and dampening convection flows of the molten metal alloy which cause macrosegregation by means of the magnetic field.

Abstract: An electromagnetic brake device for a continuous casting mold. The mold has a rectangular cross section having long sides and short sides. The mold also includes water boxes adjacent at least the long sides. The electromagnetic brake device includes an electromagnet including magnetic poles which are provided respectively at the long sides of the casting mold and are disposed in opposed relation to each other. The magnetic poles have a width generally equal to a width of the long sides of the casting mold. Coils are wound on outer peripheries of the magnetic poles. An iron core is provided in surrounding relation to the casting mold, a portion of the iron core opposite each of the short sides of the casting mold extends through the water boxes located adjacent the long sides of the casting mold. The water boxes include openings through a surface into which the magnetic poles are adapted to be inserted. A backup plate is provided at a side of the water boxes located adjacent the mold.

Abstract: Method and apparatus for reducing macrosegregation in the simultaneous casting of a plurality of metal alloy ingots in a continuous or semicontinuous casting operation. Several casting molds are arranged closely together in an array. An outer electromagnetic coil is arranged around the outer periphery of the array of molds and their formed ingots. Preferably, when the circular molds are employed, a solenoid is provided in the central space of the molds. Direct current in the outer coil and in the solenoid create a static magnetic field whose combined effect acts on the liquid pool of the molten metal. The outer coil has straight sides and curved corners. Passive flux return devices are located along the straight sides of the outer coil. If rectangular molds are used, then only the outer electromagnetic coil is arranged around the casting assembly.

Abstract: A method for continuous casting of steel comprises the steps of feeding molten steel to cooling device for cooling molten steel by use of feeding device for feeding molten steel; cooling fed molten steel by the cooling device; generating a high-frequency magnetic field near a zone where the feeding device, the cooling device and molten steel contact each other; and converging the high-frequency magnetic field on the zone where the feeding device, the cooling device and molten steel contact each other. Further, an apparatus for continuous casting of steel comprises feeding device for feeding molten steel; cooling device for cooling molten steel fed by the feeding device; generating device for generating a high-frequency magnetic field near a zone where the feeding device, the cooling device and molten steel contact each other; and converging device for converging the magnetic field on the zone where the feeding device, the cooling device and molten steel contact each other.

Abstract: An electromagnetic process and apparatus for continuous casting of a thin strip of electrically conductive material on a cooled roll. The free surface of the material in the liquid state in the casting feed injector is subjected to the action of an alternating magnetic field generated by a single phase electrical current. The magnetic field can be generated by means of an inductor from tubular elements within which cooling water circulates.

Abstract: A water-cooled mold for use in continuous steel casting process has at least two vertically-spaced coils arranged in the wall structure of the mold so as to surround molten steel in the mold or in a solidification shell within the mold and such that a jet of molten steel from an immersion nozzle of a tundish in the molten steel collides with the mold wall at a level between the coils. During supplying the molten steel from the tundish into the mold, the coils are supplied with DC currents of opposite directions so as to generate cusp fields in the mold, thereby suppressing the movement of the jet of the molten steel, as well as ascending and descending flows of the molten steel after collision with the mold wall.

Abstract: An electromagnetic, levitation metal pipe casting method and system which provides an improved and simplified combined heat exchanger/levitator/containment coil assembly that comprises a single, outer multi-phase traveling wave coil structure and an inner solenoid coil structure. The outer, multi-phase traveling wave coil structure is positioned radially outside and coaxial with solidifing pipe during the casting process. The inner solenoid coil is positioned coaxial with and inside the pipe being cast. The outer multi-phase traveling wave coil and the inner solenoid coil are operated at substantially different frequencies and excitation current magnitudes. The improved system and method offer several functional and physical advantages over previous known levitation pipe casting systems. The principal improved features are:1. Simplified operating and control procedures.2. Simplified inner coil fabrication.3. Simplified electrical and coolant connections to the inner coil.4.

Abstract: A continuous metal casting system in which the feed of molten metal is controlled by means of a linear induction motor capable of producing a magnetic traveling wave in a duct that connects a reservoir of molten metal to a caster. The linear induction motor produces a traveling magnetic wave in the duct in opposition to the pressure exerted by the head of molten metal in the reservoir so thatp.sub.c =p.sub.g -p.sub.mwhere p.sub.c is the desired pressure in the caster, p.sub.g is the gravitational pressure in the duct exerted by the force of the head of molten metal in the reservoir, and p.sub.m is the electromagnetic pressure exerted by the force of the magnetic field traveling wave produced by the linear induction motor. The invention also includes feedback loops to the linear induction motor to control the casting pressure in response to measured characteristics of the metal being cast.

Abstract: Molten metal passing through an outlet opening is guided in free fall by a magnetic field which rotates about the vertical axis of the opening to impress a rotation in the stream of molten metal. A further magnetic field rotating at the same rate but out of phase with the first can increase the rotation. At least one toroidal magnetic field coaxial with the rotating field can be used to shape the cross section of the pouring stream.

Abstract: Molten metal is continuously poured into the space defined by a pair of rolls (10A, 10B; 30A, 30B) positioned parallel to each other and rolling the poured molten metal while causing it solidify gradually, in which a pair of rolls are used which is constructed in a manner that a plurality of paramagnetic material zones (14, 16; 34, 36) and a plurality of ferromagnetic material zones (18, 20, 22; 38, 40) are alternately and integrally combined in the direction of axis, all of the ferromagnetic material zones of the two rolls are opposite to one another, by the action of magnets (24, 26; 50X, 50Y) positioned outside or inside the rolls.

Abstract: Dense, homogeneous tubular metal products such as pipe is cast in long lengths continuously by introducing liquid metal into the lower portion of an annular-shaped casting vessel. The liquid metal is withdrawn in the presence of an outer elongated upwardly travelling alternating electromagnetic levitation field and a second inner electromagnetic levitation field for maintaining the tubular liquid metal column in a substantially weightless and pressureless contact condition while solidifying. The resulting solidified tubular metal product is withdrawn from the upper portion of the field, cooled and further processed to result in a desired and product/and has a homogeneous, fully dense, fine grain structure due to continuous eddy current stirring by the levitating electromagnetic fields and a ripply, shiny exterior surface.

Abstract: The invention relates to a method for adjusting the level of the line of contact between the mold and the free surface of the metal in the vertical continuous casting of products of any cross-section in an ingot-mold, which includes the step of applying to the solidifying metal, by means of an electric circuit surrounding the mold, a periodic magnetic field of variable intensity having a direction substantially parallel to the axis of the mold. According to the invention, the magnetic field applied to the mold is varied over a portion of the periphery of the metal. This can be done by modifying the distance between electric circuit creating the magnetic field and the mold, by changing the vertical positioning of the circuit, or by varying the shape of the profile of the circuit.

Abstract: A method of producing a composite metal material such as clad bloom by continuous casting comprises the steps of supplying molten metals of different compositions by using two immersion nozzles into the strand pool at different positions and forming a static magnetic field zone on the boundary between the two types of metals to prevent mixing of the metals of different composition. The method enables production of a composite material exhibiting a sharp boundary between the two types of metals used and enables the thickness of the respective metal layers to be easily controlled by adjusting the location of application of the static magnetic field or the withdrawal speed of the strand of cast metal.