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:
Jan. 02, 2018
Filed:
Oct. 27, 2009
Masayuki Yamada, Yokohama, JP;
Takao Inukai, Kawasaki, JP;
Kiyoshi Imai, Taito-Ku, JP;
Shigekazu Miyashita, Yokohama, JP;
Kuniyoshi Nemoto, Yokohama, JP;
Reki Takaku, Yokohama, JP;
Masayuki Yamada, Yokohama, JP;
Takao Inukai, Kawasaki, JP;
Kiyoshi Imai, Taito-Ku, JP;
Shigekazu Miyashita, Yokohama, JP;
Kuniyoshi Nemoto, Yokohama, JP;
Reki Takaku, Yokohama, JP;
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
Abstract
A method of manufacturing a steam turbine rotor which includes an ultra-high temperature side portion in which ultra-high temperature steam flows and a high temperature side portion in which high temperature steam flows, the manufacturing method including the steps of: preparing a first electrode having a chemical composition corresponding to a chemical composition of a heat resistant alloy making up the ultra-high temperature side portion and a second electrode having a chemical composition corresponding to a chemical composition of the high temperature side portion; tentatively joining together joints of the electrodes, with the joints of the electrodes made smaller in cross sectional area than other electrode portions; subjecting the tentatively joined first and second electrodes to an ESR process to obtain an ESR ingot and forging the ingot into a shape of a rotor to obtain a rotor forging; and heat-treating the rotor forging to obtain a rotor blank and manufacturing the steam turbine rotor from the rotor blank.