Abstract: A method of annealing and descaling hot-rolled austenitic stainless steel strip wherein. The steel strip is descaled in a connected plasma descaling installation after annealing and subsequent cooling. The plasma descaling is carried out under vacuum in a plurality of stages, and the steel strip is subjected to a controlled cooling between these stages and after the final stage by means of cooling rolls so that the steel strip has a temperature below 100° C. when exiting the plasma descaling installation. An apparatus to practice the method is also disclosed.

Abstract: A method and a device for descaling a metal strip, in which the metal strip is guided in a direction of conveyance through at least one plasma descaling unit in which it is subjected to a plasma descaling. The metal strip is subjected to an automatically controlled cooling process in a cooling unit following the plasma descaling in the one or more plasma descaling units in such a way that it has a well-defined temperature downstream of the cooling unit.

Abstract: A method and a device for descaling a metal strip, in which the metal strip is guided in a direction of conveyance through at least one plasma descaling unit in which it is subjected to a plasma descaling. The metal strip is subjected to an automatically controlled cooling process in a cooling unit following the plasma descaling in the one or more plasma descaling units in such a way that it has a well-defined temperature downstream of the cooling unit.

Abstract: A method and a device for descaling a metal strip, in which the metal strip is guided in a direction of conveyance through at least one plasma descaling unit in which it is subjected to a plasma descaling. The metal strip is subjected to an automatically controlled cooling process in a cooling unit following the plasma descaling in the one or more plasma descaling units in such a way that it has a well-defined temperature downstream of the cooling unit.

Abstract: The invention concerns a method and a device for descaling a metal strip (1), especially a hot-rolled strip of normal steel or a hot-rolled or cold-rolled strip of austenitic or ferritic stainless steel, in which the metal strip (1) is guided in a direction of conveyance (R) through at least one plasma descaling unit (2, 3) in which it is subjected to a plasma descaling. The objective of the invention is to improve the production of this type of metal strip. To this end, the metal strip (1) is subjected to an automatically controlled cooling process in a cooling unit (4, 5) following the plasma descaling in the one or more plasma descaling units (2, 3) in such a way that it has a well-defined temperature downstream of the cooling unit (4, 5). The invention also concerns a method in which the strip is coated with a coating metal after the plasma descaling operation and in which the heating of the strip caused by the plasma descaling operation is utilized in the coating operation.

Abstract: The invention relates to a device for hot dip coating metal strands (1), particularly strip steel, in which the metal strand (1) can be vertically guided through a reservoir (3), which accommodates the molten coating metal (2), and though a guide channel (4) connected upstream therefrom. An electromagnetic inductor (5) is mounted in the area of the guide channel (4) and in order to retain the coating metal (2) inside the reservoir (3), can induce induction currents in the coating metal (2) by means of an electromagnetic blocking field. While interacting with the electromagnetic blocking field, said induction currents exert an electromagnetic force. In order to prevent an intense heating of the metal strand caused by the electromagnetic inductor, the invention provides that the inductor (5, 5a, 5b) is connected to electric power supply means (6) that supply the inductor with an alternating current whose frequency (f) is less than 500 Hz. In particular, a mains frequency of 50 Hz is intended.

Abstract: The invention relates to a device for hot dip coating a metal bar (1), especially a steel strip, wherein the metal bar (1) is vertically guided through a container (3) receiving the molten coating metal (2) and through a guide channel (4) which is arranged upstream therefrom. A magnet, especially an electromagnetic inductor (5), is arranged in the region of the guide channel, said magnet generating a magnetic field in order to retain the coating metal (2) in the container (3). The container (3) is provided with molten coating metal (2) by a premelt container (6). The invention also relates to a method for hot dip coating wherein said type of device is used. According to the invention, the premelt container (6) is arranged below the guide channel (4) in order to technically adapt the existing system in a simple, efficient manner.

Abstract: The invention relates to a method and device for descaling and/or cleaning a metal casting (1), particularly a hot-rolls trip made of normal steel or of stainless steel. According to the inventive method, the metal casting (1) is guided in a direction of conveyance (R) through a device (2), inside of which it is subjected to a plasma descaling and/or a plasma cleaning. In order to improve the result of the descaling or of the cleaning of the metal casting, the invention provides that before the device (2) for plasma descaling and/or plasma cleaning, in the direction of conveyance (R), the metal casting (1) is subjected to a process that imparts a high degree of flatness to the metal casting (1).

Abstract: The invention relates to a device for hot dip coating metal strands (1), particularly strip steel, in which the metal strand (1) can be vertically guided through a reservoir (3), which accommodates the molten coating metal (2), and though a guide channel (4) connected upstream therefrom. An electromagnetic inductor (5) is mounted in the area of the guide channel (4) and in order to retain the coating metal (2) inside the reservoir (3), can induce induction currents in the coating metal (2) by means of an electromagnetic blocking field. While interacting with the electromagnetic blocking field, said induction currents exert an electromagnetic force. In order to prevent an intense heating of the metal strand caused by the electromagnetic inductor, the invention provides that the inductor (5, 5a, 5b) is connected to electric power supply means (6) that supply the inductor with an alternating current whose frequency (f) is less than 500 Hz. In particular, a mains frequency of 50 Hz is intended.

Abstract: The invention relates to an apparatus for coating a metal strip passed through a container which holds the melted coating material. A channel is connected to the container which encloses the material in the form of a strip beneath the melt bath level. Channel currents are induced in the coating material by means of inductors and cause an electromagnetic force in order to hold the coating material back. The channel is attached to the base of the container such that it is easily detachable and comprises a plurality of parts which can be separated in the strip running direction, are sealed with respect to one another and can individually be moved away from the strip, transversely with respect to the strip running direction, to replace the channel with the strip located in it, after releasing the separation connection.

Abstract: The invention is directed to a process and apparatus for coating the surf of elongated materials, in particular steel strips, with a metallic coating. The material is guided in one direction through a tank holding the molten coating material. The tank has a through-duct surrounded by an electric field below the surface of the molten bath. An electromagnetic force is generated in the region where the through-duct opens into the melt, which electromagnetic force is equal to or greater than the metallostatic pressure, directed oppositely thereto vectorially and quantitatively proportional to the product of the cross-sectional area of the inlet opening and the metallostatic pressure, and in which the dwell of the strip in the melt can be controlled independently of the rate of feed of the strip.

Abstract: A process and a device for coating the surface of strip material, especially non-ferrous metal and steel strip, with a metal coating, wherein the material is conducted without reversal of direction through a container holding the molten coating material. The container has a passage duct below the level of the melting bath, in which induction currents are induced by an electromagnetic travelling field and produce, in interaction with the electromagnetic travelling field, an electromagnetic force for restraining the coating material. In order to stabilize the melt in the passage duct as well as in the container, and in order to attain, to a large extent, a counterbalance between hydrostatic and electromagnetic forces, a constant direct or alternating current field is directed opposite to the travelling field in the area near the container, damping the movement in the coating material.

Abstract: In an installation for the manufacture of hot-rolled steel strip from continuously cast stock, a caster for the continuous casting of the stock into steel strip, a furnace positioned for receiving the strip after it leaves the caster and containing at least two winding/unwinding mandrels each placed in first and second proximate locations, respectively, the first mandrel is placed in the first location adapted to receive and wind the strip into a coil, transport devices are provided for transporting the coil and first mandrel from the first location to a second location and the second mandrel from the second location to the first location; the strip is unwound from the first mandrel in said second location and then fed to a mill. Alternative embodiments include vertical or horizontal movement of the mandrels, more than two mandrels, devices for driving the mandrels at different speeds, cutting means, clamping devices, furnace heating devices, dividing shears and descaling.

Abstract: The invention relates to an installation for zinc coating one or both sides of continuous steel strip. In order to retain short change-over times when changing from one process to the other, the invention proposes to flange-mount in readily releasably manner a housing (2a, 2b), with guide rolls (3a, 3b) mounted therein, on the duct (5) leading from the furnace to the zinc bath and to design this housing so that it can be interchanged with a support for the guide roll (10) during two-sided zinc coating, making use of the mounting at the duct (5).

Abstract: Cold rolled steel strip is uncoiled, cleaned, and passed into an annealing furnace, wherein the strip is heated to and held at a relatively hot temperature, subsequently quenched, and coiled; after a period of storage the strip passes through the same equipment but now including additional pickling for removing an oxide layer, and the strip passes through the annealing furnace a second time, while operating said annealing furnace for heating to and holding at a lower temperature to obtain aging; thereafter the strip is coiled again.

Abstract: Continuously cast thin slab ingots are coiled, cut, uncoiled and rolled down to thin strip material. For a single casting line a single back and forth rolling stand is used; multiple continuous casting lines can service a single unidirectional rolling mill. The rolling temperature is attained by heat retention in the coils.

Abstract: In connection with a coating method and apparatus for one-sided coating of a continuous metal strip, a method and apparatus are provided for the mechanical removal of the oxide layer which forms on the uncoated side of said metal strip after said metal strip leaves the protective environment within which the coating occurs.