Title:
ROTOR FOR LOW-PRESSURE TURBINE
Document Type and Number:
WIPO Patent Application WO/2010/018773
Kind Code:
A1
Abstract:
Provided is a rotor for a low-pressure turbine wherein the mechanical strength characteristics can be maintained even if the temperature of steam introduced into the low-pressure turbine becomes high, and no quality problem is posed without an increase in the manufacturing costs or days. The rotor for a low-pressure turbine which is used in a steam turbine facility equipped with a high-pressure turbine, an intermediate-pressure turbine and a low-pressure turbine is constituted such that a member formed of 1CrMoV steel, 2.25CrMoV steel or 10CrMoV steel and arranged on the steam inlet side and a member formed of 3.5Ni steel and arranged on the steam outlet side are joined by welding. Alternatively, a member formed of 3.5Ni steel and arranged on the steam inlet side and a member formed of 3.5Ni steel and arranged on the steam outlet side are joined by welding, wherein the member arranged on the steam inlet side is formed of low-impurity 3.5Ni steel containing Si:0.1% or less by wt%, Mn: 0.1% or less by wt%, and inevitable impurities of P:0.02% or less, S: 0.02% or less, Sn: 0.02% or less, As: 0.02% or less, Sb:0.02% or less, Al:0.02% or less, and Cu:0.1% or less by wt%.
Inventors:
NISHIMOTO SHIN (JP)
TANAKA YOSHINORI (JP)
YAMAMOTO RYUICHI (JP)
KAWASAKI KENJI (JP)
SHIGE TAKASHI (JP)
TANAKA YOSHINORI (JP)
YAMAMOTO RYUICHI (JP)
KAWASAKI KENJI (JP)
SHIGE TAKASHI (JP)
Application Number:
PCT/JP2009/063896
Publication Date:
February 18, 2010
Filing Date:
July 30, 2009
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
NISHIMOTO SHIN (JP)
TANAKA YOSHINORI (JP)
YAMAMOTO RYUICHI (JP)
KAWASAKI KENJI (JP)
SHIGE TAKASHI (JP)
NISHIMOTO SHIN (JP)
TANAKA YOSHINORI (JP)
YAMAMOTO RYUICHI (JP)
KAWASAKI KENJI (JP)
SHIGE TAKASHI (JP)
International Classes:
F01D25/00; F01D1/04; F01D5/02; F01D5/06
Foreign References:
| JP2003145271A | 2003-05-20 | |||
| JP2007278064A | 2007-10-25 | |||
| JP2006170006A | 2006-06-29 | |||
| JP2007321630A | 2007-12-13 | |||
| JP2000064805A | 2000-02-29 | |||
| JP2008093668A | 2008-04-24 | |||
| JPS57176305A | 1982-10-29 |
Other References:
See also references of EP 2312127A4
Attorney, Agent or Firm:
TAKAHASHI, MATSUMOTO & PARTNERS INTELLECTUAL PROPERTY CORP. et al. (Ambassador Roppongi Buildings,16-13, Roppongi 3-chome, Minato-k, Tokyo 32, JP)
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