Sms Demag Ag

Sms Siemag Aktiengesellschaft

Sms Schloemann-siemag Aktiengesellschaft

Rolf Brisberger

Holger Behrens

Michael Zielenbach

Walter Trakowski

Bernhard Tenckhoff

Bodo Falkenhahn

Klaus Adolf Frommann

Peter De Kock

Matthias Kretschmer

Andrei Evgenievich Senokosov

Evgeny Stepanovich Senokosov

Rüdiger Zerbe

Robert Jürgens

Olaf Norman Jepsen

Hans-Georg Hartung

Markus Reifferscheid

Andreas Gramer

Werner Bechem

Eckart Schunk

A method for descaling a metal strip, in which the metal strip is guided in a direction of conveyance through at least two plasma descaling units, in which it is subjected to a plasma descaling, where the plasma descaling is followed directly or indirectly by an operation in which the metal strip is coated with a coating metal by hot dip galvanizing of the metal strip. The metal strip is coated with the coating metal by a vertical passage process. The coating metal is retained as a coating bath in a coating tank by an electromagnetic seal. The metal strip preheated by the plasma descaling is guided, without exposure to air, from the plasma descaling into a protective gas atmosphere of a continuous furnace necessary for the coating.

Method and device for descaling a metal strip

An apparatus for cleaning cylinders () and/or rolls (), e.g., working rolls () in a rolling stand, which are used for producing a rolled stock () such as strips or slabs, in which a liquid is sprayed onto the cylinders () at high pressure through several nozzles D-Dn, a number of nozzles (D-Dn) are stationary arranged in and/or on a nozzle beam (), at least one on-off valve is associated with each nozzle (D-Dn), and one or several nozzle(s) (D-Dn) are sequentially switched on and off one after another starting from one end of the nozzle beam.

Apparatus for cleaning cylinders or rolls

The invention relates to a device for hot-dip coating a metal strand (), especially a steel strip, in which the metal strand () is vertically guided through a container () accommodating the molten coating metal () and through a guide channel () disposed upstream thereof. The inventive device comprises at least two inductors () disposed at both sides of the metal strand () in the area of the guide channel () that are used to generate an electromagnetic field for retaining the coating metal () in the container (), and at least one sensor (') for detecting the position (s) of the metal strand () in the area of the guide channel (). In order to simplify and render more precise the detection of the position of the metal strand in the guide channel, the sensor for detecting the position of the metal strand () consists of two coils (&#x2032;) that are disposed, when seen from the direction of conveyance (R) of the metal strand (), within the height (H) of the inductors () between the inductors () and the metal strand (). The invention further relates to a method for hot-dip coating a metal strand.

Method and device for hot-dip coating a metal strand

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.

Method and device for descaling metal strip

The invention relates to a method for hot-dip coating a metal strand (), especially a steel strip, according to which the metal strand () is vertically guided through a container () accommodating the molten coating metal () and through a guide channel () disposed upstream thereof. An electromagnetic field is generated in the area of the guide channel () by means of at least two inductors () disposed at both sides of the metal strand () to retain the coating material () in the container (). In order to stabilize the metal strand () in a center position in the guide channel (), an electromagnetic field, superimposing the electromagnetic field of the inductors (), is generated by means of at least two additional coils () disposed at both sides of the metal strand (). In order to improve efficiency of the control of the metal strand in the guide channel, the center position of the metal strand () in the guide channel () is stabilized in a closed control loop by carrying out the following steps: a) detecting the position (s, s', s&#x2033;) of the metal strand () in the guide channel (); b) measuring the induced current (I) in the inductors (); c) measuring the induced current (I) in the additional coils (); d) influencing the induced current (I) in the additional coils () depending on the parameters (s, I, I) measured in steps a) to c), in order to maintain the metal strand () in a center position in the guide channel (). The invention further relates to a device for hot-dip coating a metal strand.

The invention relates to a device for hot-dip coating a metal bar (), particularly a steel strip, in which the metal bar () is vertically directed through a container () receiving the molten coating metal () and a directing channel () that is arranged upstream thereof. Said device comprises at least two inductors () which are disposed on both sides of the metal bar () in the zone of the directing channel () and generate an electromagnetic field for retaining the coating metal () within the container (). In order to better control the coating process, the inventive device is characterized by a sealing means (') which is arranged above the directing channel () in the bottom area () of the container () and alternatively releases or interrupts the flow of molten coating metal () to the metal bar () and/or the directing channel ().

Device for hot-dip coating a metal bar

The invention relates to a device for hot dip coating a metal bar (), especially a steel strip, in which the metal bar () is directed vertically through a container () accommodating the molten coating metal () and through a guide channel () mounted upstream thereof. The inventive device comprises at least two inductors () which are arranged on both sides of the metal bar () in the area of the guide channel () and generate an electromagnetic field for retaining the coating metal () inside the container (). In order to relax the coating bath, the distance (d) between the walls () that delimit the guide channel () is not kept constant in a direction (N) extending perpendicular to the surface of the metal strip () in the zone (H) of the vertical extension of the guide channel (), which is located between the bottom side () thereof and the bottom area () of the container ().

Device for hot dip coating a metal strip

The invention relates to a device for hot dip coating metal strands (), particularly strip steel, in which the metal strand () can be vertically guided through a reservoir (), which accommodates the molten coating metal (), and though a guide channel () connected upstream therefrom. An electromagnetic inductor () is mounted in the area of the guide channel () and in order to retain the coating metal () inside the reservoir (), can induce induction currents in the coating metal () 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 () is connected to electric power supply means () 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.

Device for hot dip coating metal strands

In a process of hot dip coating of metal strips, in particular, of a hot rolled steel strip, in which the metal strip is transformed into a continuous strip in an unwinding station with an adjoining welding machine, and then the continuous strip is subjected to a downstream modifying process including primary and secondary prickling and, in the final treatment step; in the hot dip coating section, guiding the continuous strip through a melt bath, a variable coating process with reduced costs becomes possible when the continuous strip, in a first treatment step, is directly transported into a pickling installation. In a suitable installation for effecting the process, the primary pickling installation is located in the entry section which is separated from the hot dip coating section by an entry accumulator.

Method and installation for hot dip coating metal strips

A method and an apparatus for coating metal strip, particularly cold-rolled steel strip, with a coating metal which is in the molten state. The metal strip is heated and annealed in a heating furnace and subsequently the required strip temperature and surface properties are adjusted in a cooling zone. The strip is conducted through a coating container and, following the coating container in strip pulling direction, the coating metal thickness and the solidification process are controlled by a gas-operated stripping device. The operating gas for the stripping device is preheated in a partial area of the cooling zone of the heating furnace.

Method and apparatus for coating metal strip, particularly cold-rolled steel strip

A method for hot dip galvanizing of hot-rolled steel strip, wherein in a first method step, the strip ( ) is introduced into a pickling station ( ) and a layer of scale and reaction products are removed from the strip surface in the pickling station. In another method step, the strip ( ) is introduced into a rinsing station ( ) and residues of the pickle and pickling products are removed from the strip surface in the rinsing station, and subsequently the strip is introduced into a drying station and is dried. And from there, in another method step, the strip is introduced into a furnace ( ) and is adjusted to galvanizing temperature under a protective gas atmosphere. In a last method step, the strip is guided through a galvanizing bath and the surface of the ( ) is coated with a hot dip galvanizing layer in the galvanizing bath, wherein the strip temperature in the furnace ( ) is adjusted at most to 50&deg; K. above immersion temperature of the strip ( ) into the zinc bath.

Method and installation for hot dip galvanizing hot rolled steel strip

A method and an apparatus for carrying out the annealing step of a galvannealing process in which strips and sheets, particularly of steel, are subjected after galvanizing to an annealing step by heating the coated material and subsequently holding at final annealing temperature, wherein, during annealing, the heating step is interrupted by at least one additional holding step and, thus, a stepwise increase of the temperature over time is adjusted.

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Spielberg, Austria

Rolf Brisberger