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:
Nov. 09, 2010
Filed:
Mar. 05, 2004
Hans Vondracek, Brekerfeld, DE;
Hans Dziemballa, Iserlohn, DE;
Lutz Manke, Hagen, DE;
Alexander Borowikow, Sydower Fliess, DE;
Reinhard Uhrich, Berlin, DE;
Matthias Hüttner, Strassberg, DE;
Hans Vondracek, Brekerfeld, DE;
Hans DziemBalla, Iserlohn, DE;
Lutz Manke, Hagen, DE;
Alexander Borowikow, Sydower Fliess, DE;
Reinhard Uhrich, Berlin, DE;
Matthias Hüttner, Strassberg, DE;
ThyssenKrupp Automotive AG, Bochum, DE;
Abstract
The invention relates to a method for the thermomechanical treatment of steel. According to said method, the parent material is heated to a temperature in excess of the re-crystallization temperature, the structure is austenitized, held at an equalized temperature and then formed and subsequently quenched to form martensite and tempered. Round steel bars, whose re-crystallization temperature is adjusted over the bar length in a compensation furnace, constitute the parent material. The round steel bars are subsequently re-modeled by cross-rolling, remaining substantially straight and after the critical deformation degree has been exceeded are subjected to dynamic re-crystallization processes. The round steel bars are then subjected to a post-heating process above the Ac3 temperature, in order to undergo a complete static re-crystallization and finally are quenched from the austenitic state to form martensite and tempered.