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:
Jun. 16, 2015
Filed:
Aug. 12, 2010
Thomas Müller, Rheinberg, DE;
Nicolas Trapp, Duisburg, DE;
Norbert Arzt, Neuss, DE;
Burkhard Helten, Duisburg, DE;
Thorsten Schmitz, Krefeld, DE;
Thomas Müller, Rheinberg, DE;
Nicolas Trapp, Duisburg, DE;
Norbert Arzt, Neuss, DE;
Burkhard Helten, Duisburg, DE;
Thorsten Schmitz, Krefeld, DE;
Vallourec Deutschland GmbH, Düsseldorf, DE;
Abstract
In a method for producing hot-rolled sections of steel with a rectangular or square cross-section, a substantially round pipe blank produced seamlessly by hot rolling or cold finished and welded and having a defined nominal outside diameter is initially produced and then formed at a forming temperature into a hollow section having the required cross-section, with visible edges Cand Cof the hollow section having a value ≦1.5×t (t=wall thickness). The pipe blank has a nominal outer diameter determined from a reduction ratio of the pipe blank to be achieved and the hollow section dimensions to be achieved, wherein the reduction ration lies within a range of −2% to −13% and is determined according to the following formula:Reduction ratio[%]=[(2×())−π×]×100%/[2×()].