The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2011
Filed:
Jun. 09, 2004
Martin Fleischanderl, Rainbach i.M., AT;
Siegfried Kolnberger, Pasching, AT;
Josef Faderl, Steyr, AT;
Gerald Landl, Linz, AT;
Anna Elisabeth Raab, Linz, AT;
Werner Brandstätter, Linz, AT;
Martin Fleischanderl, Rainbach i.M., AT;
Siegfried Kolnberger, Pasching, AT;
Josef Faderl, Steyr, AT;
Gerald Landl, Linz, AT;
Anna Elisabeth Raab, Linz, AT;
Werner Brandstätter, Linz, AT;
voestalpine Stahl GmbH, Linz, AT;
Abstract
The invention relates to a method for producing a hardened steel part having a cathodic corrosion protection, whereby a) a coating is applied to a sheet made of a hardenable steel alloy in a continuous coating process; b) the coating is essentially comprised of zinc; c) the coating additionally contains one or more oxygen-affine elements in a total amount of 0.1% by weight to 15% by weight with regard to the entire coating; d) the coated steel sheet is then, at least in partial areas and with the admission of atmospheric oxygen, brought to a temperature necessary for hardening and is heated until it undergoes a microstructural change necessary for hardening, whereby; e) a superficial skin is formed on the coating from an oxide of the oxygen-affine element(s), and; f) the sheet is shaped before or after heating, and; g) the sheet is cooled after sufficient heating, whereby the cooling rate is calculated in order to achieve a hardening of the sheet alloy. The invention also relates to a corrosion protection layer for the hardened steel part and to the steel part itself.