Steam turbine rotor shaft thereof and heat resisting steel

Details Steam turbine rotor shaft thereof and heat resisting steel Steam turbine rotor shaft thereof and heat resisting steel

1995-06-05

1996-10-29

Yee, Deborah

Metal treatment

Stock

Ferrous

148547, 148649, 420109, C21D 900, C22C 3844, C22C 3846

Patent

active

055693385

ABSTRACT:
The present invention relates to a steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530.degree. C., a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

REFERENCES:
patent: 3642380 (1972-02-01), Saunders et al.
patent: 5007240 (1991-04-01), Ishida et al.
patent: 5108699 (1992-04-01), Bodnar et al.

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