Oblon, McClelland, Maier & Neustadt, L.L.P.
Steam turbine and steam turbine blade
A steam turbine 3 includes: a turbine rotor 4; a rotor blade 5 implanted to the turbine rotor 4; a stator blade 6 provided at an upstream side of the rotor blade 5; and a turbine casing 13 supporting the stator blade 6 and including the turbine rotor 4, the rotor blade 5 and the stator blade 6, and have a constitution in which a stage 7 is formed by a pair of the rotor blade 5 and the stator blade 6, and a steam passage 8 is formed by arranging plural stages 7 in an axial direction of the turbine rotor 4. A surface treatment to suppress an increase of a surface roughness caused by oxidation is performed for at least a part of a surface of the stator blade 6 and a surface of the rotor blade 5. 
KABUSHIKI KAISHA TOSHIBA
F F F C F
F05D F05D F01D C23C F05D
additional additional inventional inventional additional
Kenji Masahiro Masashi Tadashi Akio Kazuyoshi Satoru
Kamimura Saito Takahashi Tanuma Sayano Nakajima Asai