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. 03, 2004
Filed:
Feb. 15, 2002
Applicant:
Inventors:
Assignee:
voestalpine Schienen GmbH, Donawitz, AT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/04 ;
U.S. Cl.
CPC ...
C21D 9/04 ;
Abstract
A process for the manufacture of a railroad rail of a steel alloy having a pearlitic microstructure. The rail is is shaped at a reduction rate of 1.8 to 8% and aligned straight in its longitudinal direction at a temperature between 770° C. and 1050° C., whereafter it is mounted with the head down and is allowed to cool slowly in still air to a temperature of 5 to 120° C. above the Ar temperature, and upon reaching this temperature at least the rail head is dipped into a cooling liquid and is cooled to the temperature of conversion of an austenitic grain microstructure into a fine pearlitic grain microstructure.