Title:
STEAM TURBINE BLADE AND ITS MANUFACTURE, AND STEAM TURBINE POWER PLANT
Document Type and Number:
Japanese Patent JP3666256
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To manufacture a steam turbine blade having proper toughness together with strength by setting the blade part length of a blade to a plurality of specified numerical values to a plurality of specified numerical values related to the rotating speed of the blade, setting the tensile strength at room temperature of a dovetail part to a specified numerical value or more, and forming the blade of a Ti-base alloy.
SOLUTION: In a final stage steam turbine blade for steam turbine low- pressure turbine, the length of a blade part 51 is set to 43 inches or more at a blade revolution of 3600 rpm, and the steam temperature is set to 538-650°C. A dovetail 52 is formed of eight forks, and the tensile strength is set to 110 kg/mm2 or more. Further, a Ti-base alloy or Do-base alloy of stelite is brazed to an erosion shield 54. The blade is formed of a Ti-base alloy containing 4-8% al, 4-8% V and 1-4% Sn by weight. In the manufacture, solution treatment and aging treatment for hot forging a blade material and cooling it after heating within prescribed aging temperature and solution treatment temperature are performed.
Inventors:
Hiroyuki Doi
Mitsuo Kuriyama
Shigeyoshi Nakamura
Shinya Konno
Takeshi Onoda
Mitsuo Kuriyama
Shigeyoshi Nakamura
Shinya Konno
Takeshi Onoda
Application Number:
JP22403198A
Publication Date:
June 29, 2005
Filing Date:
August 07, 1998
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
C22C14/00; C22C38/44; C22C38/46; C22C38/52; C22F1/00; C22F1/18; F01D5/28; (IPC1-7): F01D5/28; C22C14/00; C22F1/18
Domestic Patent References:
| JP1202389A | ||||
| JP7150316A | ||||
| JP61284560A | ||||
| JP62180030A |
Foreign References:
| WO1997010066A1 |
Attorney, Agent or Firm:
Yasuo Sakuta