Heat resisting steel, steam turbine rotor shaft using the...

Details Heat resisting steel, steam turbine rotor shaft using the... Heat resisting steel, steam turbine rotor shaft using the...

2005-07-05

2009-06-02

Look, Edward (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

With runner shaft of specific shape or material

C148S335000, C420S109000

Reexamination Certificate

active

07540711

ABSTRACT:
The invention provides a heat resisting steel having superior high-temperature strength and notch rupture strength, a rotor shaft using the heat resisting steel, a steam turbine using the rotor shaft, and a power plant using the steam turbine. The heat resisting steel is made of a Cr—Mo—V low-alloy steel containing 0.15-0.40% by weight of C, not more than 0.5% of Si, 0.05-0.50% of Mn, 0.5-1.5% of Ni, 0.8-1.5% of Cr, 0.8-1.8% of Mo and 0.05-0.35% of V, and having a (Ni/Mn) ratio of 3.0-10.0.

REFERENCES:
patent: 6123504 (2000-09-01), Shiga et al.
patent: 6358004 (2002-03-01), Shiga et al.
patent: 6575700 (2003-06-01), Arai et al.
patent: 9-41076 (1997-02-01), None
patent: 9-194987 (1997-07-01), None
patent: 9-268343 (1997-10-01), None
patent: 10-183294 (1998-07-01), None
patent: 11-286741 (1999-10-01), None

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