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:
Feb. 26, 2002
Filed:
Aug. 31, 1998
Jürgen Ewald, Mülheim, DE;
Torsten-Ulf Kern, Wesel, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A turbine shaft, in particular for a steam turbine, is oriented along an axis of rotation. The turbine shaft has a first region with a maximum radius R and a second region adjoining the first region and having a maximum radius R2>R1. The first region includes a first base material for use at a temperature of over 550° C. and the second region includes a second base material for use at a temperature below 550° C. An alloy steel used for the first and the second base materials in each case has a chromium content of between 8.0% by weight and 12.5% by weight at a substantially identical austenitizing temperature. A method is provided for producing the turbine shaft.