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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.:

US 10260357 B1

PDFFull Text
Date of Patent:
Apr. 16, 2019

Filed:

Dec. 16, 2015

Steam turbine rotor, steam turbine including same, and thermal power plant using same

Applicant:

Mitsubishi Hitachi Power Systems, Ltd., Nishi-ku, Yokohama, JP;

Inventors:

Shinji Oikawa, Yokohama, JP;

Shinya Imano, Yokohama, JP;

Hiroyuki Doi, Yokohama, JP;

Akira Yoshinari, Yokohama, JP;

Assignee:

Mitsubishi Hitachi Power Systems, Ltd., Yokohama, JP;

Attorney:

Crowell & Moring LLP

Primary Examiner:

Daniel J Schleis

Int. Cl.
CPC ...
F01D 5/28 (2006.01); C22C 14/00 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01); F01D 5/02 (2006.01); F01D 5/06 (2006.01); F01D 25/00 (2006.01); C22C 38/00 (2006.01);
U.S. Cl.
CPC ...
F01D 5/28 (2013.01); C22C 14/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); F01D 5/02 (2013.01); F01D 5/06 (2013.01); F01D 25/005 (2013.01); F05D 2220/31 (2013.01); F05D 2220/72 (2013.01); F05D 2240/60 (2013.01); F05D 2300/11 (2013.01); F05D 2300/121 (2013.01); F05D 2300/13 (2013.01); F05D 2300/131 (2013.01); F05D 2300/132 (2013.01); F05D 2300/171 (2013.01); F05D 2300/174 (2013.01);
Abstract

It is an objective of the invention to provide a steam turbine rotor of which a rotor shaft is made of a low-cost heat resistant ferritic steel and that can withstand high main steam temperatures of about 650° C. There is provided a steam turbine rotor comprising: a rotor shaft made of a heat resistant ferritic steel such as a 12-Cr steel; and a rotor blade made of a Ti—Al alloy, wherein the Ti—Al alloy includes: from 38 to 45 atomic % of Al; from 0.5 to 2 atomic % of V; from 2 to 6 atomic % of Cr and/or Mo; and the balance being Ti and incidental impurities.

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