Thyssenkrupp Steel Europe Ag

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Outokumpu Nirosta Gmbh

Rudolf Schoenenberg

Marc Blumenau

Fred Jindra

Christopher Gusek

Frank Eisner

Jens Wemhoener

Michael Peters

Sabine Zeizinger

Hans-Joachim Krautschick

Martin Norden

Bert-Reiner Willeke

Tobias Denner

Christian Klatt

Thomas Heller

Jens-Ulrik Becker

Richard Georg Thiessen

Karsten Machalitza

Hans-Joachim Heiler

Jian Bian

Joerg Adler

Dirk Czupryna

Gerd Jendrischik

Alfred Peitz

Heike Heymer

Joachim Huelstrung

Bert-Heiner Willeke

Joerg Schulte

Markus Kovac

Thomas Rieger

Oliver Bulters

Oliver Brehm

Andreas Westerfeld

The invention relates to a device and a method for hot-dip coating a metal strip with a metal covering, wherein the metal strip is directed continuously through a melt bath, wherein the thickness of the metal covering present on the metal strip when it leaves the melt bath is adjusted by means of a scraping device, and wherein slag which is present on the melt bath is driven away from the metal strip leaving the melt bath by means of a gas flow. To prevent slag from coming into contact with the metal strip leaving the melt bath, the invention drives away the slag from the metal strip by means of at least one nozzle which is arranged in close proximity to the metal strip, that a gas flow which extends over the width of the metal strip is directed onto the surface of the melt bath.

Method and device for hot-dip coating a metal strip with a metal covering

A method which allows process-stable hot-dip coating of Ni-alloy steel flat products in a cost- and resource-effective manner, including the following steps: a) provision of a steel flat product obtained by cold- or hot-rolling; b) within 1-30 s, heating the steel flat product to a holding temperature between 700 and 1100&#xb0; C., under a heating atmosphere of N2; c) holding the steel flat product at the holding temperature for a holding duration of 10-120 s under a holding atmosphere of N2; d) cooling the steel flat product from the holding temperature to a strip inlet temperature of 430-800&#xb0; C.; and e) passing the steel flat product through an inlet zone, in which an inert or reducing inlet atmosphere predominates, and passing the steel flat product through a melt bath, wherein TP&#x3e;TP&#x3e;TP

Method for hot-dip coating of a steel flat product

The invention relates to a device for strip guidance in a hot medium, comprising a deflection roller () which has two roller pins () and is mounted to supporting arms () by means of ceramic journal bearings (), wherein the journal bearings () are in each case arranged in a bearing receptacle () of the associated supporting arm (). The invention is characterized in that at least one of the journal bearings () in its associated supporting arm () is fixed in the bearing receptacle () by means of a force-fit that engages on the outer edge of the journal bearing () and balances the different heat expansion coefficients of the journal bearings () and the bearing receptacle ().

Device for strip guidance in a hot medium (II)

The invention relates to the field of materials science and to a device for reducing pressure in cavities in media at higher temperatures, such as those devices which can be used for devices for hot-dip coating metal materials in the metal processing industry for example. The aim of the invention is to provide a device by means of which pressure can be reduced in the cavity of the hollow bodies in a reliable and controlled manner and simultaneously the penetration of the media can be delayed or completely prevented at the higher temperatures. This is achieved by a device for reducing pressure in hollow bodies in media at higher temperatures, wherein at least one opening to the cavity of the hollow body is provided in hollow body regions which are not used for the intended application, said opening being closed from the medium surrounding the hollow body by at least one component made of a gas-permeable metal or ceramic material.

Device for reducing pressure in hollow bodies in media at higher temperatures

A flat steel product having a tensile strength of at least 1200 MPa and consists of steel containing (wt %) C: 0.10-0.50%, Si: 0.1-2.5%, Mn: 1.0-3.5%, Al: up to 2.5%, P: up to 0.020%, S: up to 0.003%, N: up to 0.02%, and optionally one or more of the elements 'Cr, Mo, V, Ti, Nb, B and Ca' in the quantities: Cr: 0.1-0.5%, Mo: 0.1-0.3%, V: 0.01-0.1%, Ti: 0.001-0.15%, Nb: 0.02-0.05%, wherein &#x3a3;(V, Ti, Nb)&#x2266;0.2% for the sum of the quantities of V, Ti and Nb, B: 0.0005-0.005%, and Ca: up to 0.01% in addition to Fe and unavoidable impurities. The flat steel product has a microstructure with (in surface percent) less than 5% ferrite, less than 10% bainite, 5-70% untempered martensite, 5-30% residual austenite, and 25-80% tempered martensite, at least 99% of the iron carbide contained in the tempered martensite having a size of less than 500 nm.

High-strength flat steel product and method for producing same

The invention relates to a device for strip guidance in a hot medium, comprising a deflection roller () mounted on supporting arms () and a carrier device holding the supporting arms (). The device is characterized in that one of the supporting arms () is mounted on the carrier device by means of a floating bearing (), wherein the floating bearing () allows the mounted supporting arm on the carrier device to move parallel to the longitudinal direction of the deflection roller (), and in that an elastic counter element (), which acts parallel to the longitudinal direction of the deflection roller () upon the supporting arm () mounted on the floating bearing (), is present and counteracts an increasing distance between the supporting arms (). In this way, the technical problems of offsetting a temperature-induced length change of the deflection roller and avoiding an uncontrolled movement of the system are solved.

Device for strip guidance in a hot medium (I)

An apparatus and a method for the treatment of a flat steel product, taking place in throughput. The apparatus includes an indirectly heated annealing furnace chamber, a conveyor device for continuously conveying the flat steel product over a conveyor path leading from an entry to an exit of the annealing furnace chamber, and nozzle arrangements for feeding atmosphere gas, which is reactive in relation to the flat steel product, into the annealing furnace chamber. A controlled treatment of the flat steel product includes a first nozzle arrangement, from which a gas jet induces a first gas flow towards the entry of the annealing furnace chamber and sweeping over the surface of flat steel product to be treated. A second nozzle arrangement includes a gas jet which induces a second gas flow directed towards the exit of the annealing furnace chamber and sweeping over the surface of flat steel product.

Apparatus and method for the treatment of a flat steel product, taking place in throughput

A method for hot dip coating a flat stainless steel product with more than 5 wt. % Cr with a protective metallic coating by: heating the flat steel product under an oxygen-free heating atmosphere to 100&#xb0; C.-600&#xb0; C. within 1-30 seconds; continuing heating to a holding temperature of 750&#xb0; C.-950&#xb0; C., by heating to 550&#xb0; C.-800&#xb0; C. under an inert or reducing atmosphere, holding within this temperature window for 1 to 15 seconds under an oxidizing atmosphere, and continuing heating under an inert or reducing atmosphere, until the holding temperature is reached; holding at the holding temperature for 10-120 seconds under a reducing atmosphere; and passing the flat steel product through a nozzle area under an inert or reducing atmosphere at 430&#xb0;-780&#xb0; C. and into a molten bath in which the flat steel product is coated with the metallic coating.

Method for hot dip coating a flat steel product

Optimal wetting and adhesion of the hot-dip coating by way of pre-oxidation in a DFF pre-heating furnace and humidification of the annealing atmosphere in a holding zone is achieved in a hot dip galvanised flat steel product.

Method for producing a flat steel product provided with a metal protective layer by way of hot dip coating

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Daphne, AL, United States of America

Rudolf Schoenenberg