Rotor for steam turbine and manufacturing method thereof

Details Rotor for steam turbine and manufacturing method thereof Rotor for steam turbine and manufacturing method thereof

1994-07-19

1998-07-14

Yee, Deborah

Metal treatment

Stock

Ferrous

148325, 148547, 148654, C21D 810, C22C 3846, C22C 3844

Patent

active

057798214

ABSTRACT:
A rotor for steam turbine rotor made of a heat resistant steel having a composition, which contains 0.05 to 0.3% by weight of C, 8.0 to 13.0% by weight of Cr, 1.0% by weight or less (excluding 0%) of Si, 1.0% by weight or less (excluding 0%) of Mn, 2.0% by weight or less (excluding 0%) of Ni, 0.10 to 0.50% by weight of V, 0.50 to 5.0% by weight of W, 0.025 to 0.10% by weight of N, 1.5% by weight or less excluding 0%) of Mo, at least one element selected from the group consisting of 0.03 to 0.25% by weight of Nb and 0.03 to 0.50% by weight of Ta, 0 to 3% of Re, 0 to 5.0% by weight of Co, 0 to 0.05% by weight of B and the balance of Fe and inevitable impurities, and having a ferrite/martensite structure.

REFERENCES:
patent: 4564392 (1986-01-01), Ohhashi et al.
patent: 4857120 (1989-08-01), Watanabe et al.
Toshio Fujita, vol. 76, pp. 1053-1059 "Development of High Chromium Ferritic Steels For Ultra Super Critical Power Plant".
PWR, vol. 21, "The Steam Turbine Generator Today" Materials, Flow Path Design, Repair and Refurbishment, C. Berger, S.M. Beech, K.H. Mayer, M. Staubli, D.V. Thornton.

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