Metal treatment – Stock – Age or precipitation hardened or strengthened
Reexamination Certificate
2004-06-10
2008-12-02
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Age or precipitation hardened or strengthened
C148S419000, C420S447000, C420S584100
Reexamination Certificate
active
07459035
ABSTRACT:
To provide a rotor material preferable for a steam turbine of which main steam temperature is 675° C. or more, particularly exceeding 700° C., and a steam turbine plant having a rotor formed by the material, the invention provides a steam turbine plant including a very-high-pressure turbine of which steam inlet temperature is 675 to 725° C. and steam outlet temperature is 650° C. or less, a high-pressure turbine, and a medium-low-pressure turbine, wherein a rotor of the very-high-pressure turbine is formed from a forged material of NiFe-base alloy containing: 14 to 18 weight % Cr, 15 to 45 weight % Fe, 1.0 to 2.0 weight % Al, 1.0 to 1.8 weight % Ti, C and N of which the sum is 0.05 or less weight %, and Nb in the range specified by the formula: 3.5−(Fe weight %)/20<(Nb weight %)<4.5−(Fe weight %)/20.
REFERENCES:
patent: 2570193 (1951-10-01), Walter et al.
patent: 3343950 (1967-09-01), Edward et al.
patent: 3663213 (1972-05-01), Elselstein et al.
patent: 5480283 (1996-01-01), Doi et al.
patent: 5863494 (1999-01-01), Nazmy et al.
patent: 6531002 (2003-03-01), Henry et al.
patent: 2525586 (1976-01-01), None
patent: 583162 (1946-12-01), None
patent: 583212 (1946-12-01), None
patent: 62-023949 (1987-01-01), None
patent: 10-226837 (1998-08-01), None
patent: 10 226837 (1998-08-01), None
patent: 410226837 (1998-08-01), None
patent: 2000-273597 (2000-10-01), None
patent: 2000-282808 (2000-10-01), None
patent: 2000-303802 (2000-10-01), None
patent: 2001-082109 (2001-03-01), None
patent: 2002-256814 (2002-09-01), None
patent: 2003-518220 (2003-06-01), None
“Mechanical Property and Microstructure of low Nb and High Al Ni-Fe Base Superalloy (IN706)”, CAMP-ISIJ vol. 15(2002), p. 535.
Doi Hiroyuki
Imano Shinya
Kawanaka Hirotsugu
Saitou Eiji
Dickstein & Shapiro LLP
Hitachi , Ltd.
Yee Deborah
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