Voestalpine Stahl Gmbh

Martin Peruzzi

Siegfried Kolnberger

Werner Brandstätter

Ronald Fluch

Thomas Kurz

Josef Faderl

Bernhard Strauss

Enno Arenholz

Ludovic Samek

Franz Dorninger

Reinhold Stotz

Johann Strutzenberger

Thomas Manzenreiter

Werner Brandstaetter

Werner BRANDSTÄTTER

Bernhard Strauß

The invention relates to a method for the production and removal of a temporary protective layer for a cathodic coating, particularly for the production of a hardened steel component with an easily paintable surface, wherein a steel sheet made of a hardenable steel alloy is subjected to a preoxidation, wherein said preoxidation forms a FeO layer with a thickness of 100 nm to 1,000 nm and subsequently a melt dip coating is conducted, wherein, during the melt dip coating, a zinc layer is applied having a thickness of 5 to 20 &#x3bc;m, preferably 7 to 14 &#x3bc;m, on each side, wherein the melt dip process and the aluminum content of the zinc bath is adjusted such that, during the melt dip coating, an aluminum content for the barrier layer results of 0.15 g/mto 0.8 g/mand the steel sheet or sheet components made therefrom is subsequently heated to a temperature above the austenitizing temperature and is then cooled at a speed greater than the critical hardening speed in order to cause hardening, wherein oxygen-affine elements are contained in the zinc bath for the melt dip coating in a concentration of 0.10 wt.-% to 15 wt.-% that, during the austenitizing on the surface of the cathodic protective layer, form a thin skin comprised of the oxide of the oxygen-affine elements and said oxide layer is blasted after hardening by irradiation of the sheet component with dry ice particles.

Method for the production and removal of a temporary protective layer for a cathodic coating

The invention relates to a method for connecting sheet metal parts () to form a laminated core (), wherein sheet metal parts () are separated, in particular punched, from a sheet metal strip () that has, at least in some areas, a layer having curable polymer adhesive (), and the sheet metal parts () are preliminarily connected to form a laminated core (), the preliminary connection comprising plasticizing the adhesive () at least in some areas and joining the sheet metal parts () in order to connect the sheet metal parts by means of the plasticized adhesive () of at least one of the sheet metal parts (), and in a subsequent step the laminated core () having preliminarily connected sheet metal parts () is subjected to a curing of the adhesive (). In order to create an advantageous connection between the sheet metal parts, the plasticizing of the adhesive () comprises the introduction of a softener (), in particular HO.

Method and device for connecting sheet metal parts to form a laminated core

In a method for producing a structural part from an iron-manganese-stell sheet (), a sheet-metal workpiece () is cold-formed in a forming die (). The formed sheet-metal workpiece is heated to a temperature between 500&#xb0; C. and 700&#xb0; C. () and calibrated in a calibrating die ().

Method for producing a structural part from an iron-manganese steel sheet

The invention relates to a method for the production of a hardened component made of a hardenable steel, wherein the steel strip is exposed to a temperature increase in an oven, and is thus exposed to an oxidizing treatment such that a surface oxide layer is created, and subsequently a coating using a metal or a metal alloy is carried out. The strip is heated and at least partially austenitized for producing an at least partially hardened component, and subsequently cooled and thereby hardened. The invention also relates to a steel strip produced according to said method.

Method for producing coated and hardened components of steel and coated and hardened steel strip therefor

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Linz, Austria

Martin Peruzzi