Title:
STEAM TURBINE ROTOR MATERIAL FOR HIGH TEMPERATURE USE
Document Type and Number:
Japanese Patent JP3310825
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a steam turbine rotor material for high temp. use, applicable to high temp. steam conditions, by forming a Cr steel having a composition in which respective contents of C, Si, Mn, Cr, V, Nb, Ta, N, Mo, W, and Co are specified
SOLUTION: This steam turbine rotor material for high temp. use has a composition consisting of, by weight ratio, 0.05-0.13% C, 0.005-0.10% Si, 0.01-0.5% Mn, 9-12% Cr, 0.1-0.3% V, 0.01-0.15%, in total, of Nb and Ta, 0.01-0.1% N, 0.05-0.5% Mo, 1.5-3% W, 1-4% Co, and the balance Fe with inevitable impurities. If necessary, a part of Fe is substituted by B and B is incorporated by 0.001-0.03%. B has a function of increasing grain boundary strength and contributes to the improvement of creep rupture strength.
Inventors:
Masatomo Kamada
Akiji Fujita
Ikujiro Kitagawa
Katsuo Kaku
Akiji Fujita
Ikujiro Kitagawa
Katsuo Kaku
Application Number:
JP17976995A
Publication Date:
August 05, 2002
Filing Date:
July 17, 1995
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
Nippon Casting Steel Co., Ltd
Nippon Casting Steel Co., Ltd
International Classes:
F01D5/02; C22C38/00; C22C38/22; C22C38/30; C22C38/32; F01D25/00; (IPC1-7): C22C38/00; C22C38/30; C22C38/32; F01D5/02; F01D25/00
Domestic Patent References:
| JP5311344A | ||||
| JP4371552A | ||||
| JP3274223A | ||||
| JP2197550A | ||||
| JP2290950A |
Attorney, Agent or Firm:
Ryoichi Hagiwara (1 person outside)
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