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:
Aug. 26, 2008
Filed:
Sep. 19, 2002
Applicants:
Klaus Küppers, Erkrath, DE;
Meinert Meyer, Ekrath, DE;
Thomas Nerzak, Gelsenkirchen, DE;
Inventors:
Assignee:
SMS Meer GmbH, Monchengladbach, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
In order to obtain a fine-lamellar perlite structure in the edge region of the heads of rails (), especially hot-rolled rails for carriageways or railways, by specific thermal treatment during cooling from the rolling heat without the formation of bainite, precooling () occurs in order to achieve a core temperature of approximately 750-850° C., and the temperature of the more intensively cooled edge region is raised by intermediate heating () to at least said core temperature and finally cooled ().