EP2312127A1 - Rotor for low-pressure turbine - Google Patents
Rotor for low-pressure turbine Download PDFInfo
- Publication number
- EP2312127A1 EP2312127A1 EP09806066A EP09806066A EP2312127A1 EP 2312127 A1 EP2312127 A1 EP 2312127A1 EP 09806066 A EP09806066 A EP 09806066A EP 09806066 A EP09806066 A EP 09806066A EP 2312127 A1 EP2312127 A1 EP 2312127A1
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- EP
- European Patent Office
- Prior art keywords
- pressure turbine
- steel
- steam
- low
- less
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
- F01D1/02—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
- F01D1/04—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines traversed by the working-fluid substantially axially
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D3/00—Machines or engines with axial-thrust balancing effected by working-fluid
- F01D3/02—Machines or engines with axial-thrust balancing effected by working-fluid characterised by having one fluid flow in one axial direction and another fluid flow in the opposite direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
- F01D5/063—Welded rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/13—Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
- F05D2300/132—Chromium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/177—Ni - Si alloys
Definitions
- the present invention relates to a low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, and particularly, to a low-pressure turbine rotor suitably used in a steam turbine facility in which the steam inlet temperature attains a high-temperature of 380°C or higher.
- thermal power generation is safe and its utility value is high as a power generation method with a high capacity to respond to load change, it is expected that thermal power generation will also continue to play an important role in the power generation field in the future.
- a steam turbine facility used for coal-fired thermal power generation including a steam turbine generally has a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, and steam in the range of 600°C is used for the steam turbine facility.
- steam in the 600°C range supplied from a boiler is introduced into the high-pressure turbine in a high-pressure blade stage composed of blades and a vanes to rotate the high-pressure turbine to perform expansion work.
- the steam is exhausted from the high-pressure turbine and is introduced into the intermediate-pressure turbine to rotate the intermediate-pressure turbine to perform expansion work, similarly to the high-pressure turbine.
- the steam is introduced into the low-pressure turbine to perform expansion work and is exhausted and condensed to a condenser.
- the low-pressure turbine rotor in such a steam turbine facility is formed from 3.5Ni steel (for example, 3.5NiCrMoV steel, etc.), and the inlet steam temperature of the low-pressure turbine was set to 380°C or lower that is a temperature such that 3.5Ni steel is able to maintain mechanical strength characteristics and toughness.
- second-stage reheating pressure becomes low.
- the inlet steam temperature of the low pressure turbine of the double-stage reheating rises higher than single-stage reheating, and design conditions become strict.
- Patent Document 1 disclosed a low-pressure turbine rotor capable of reducing the content of impurities contained in 3.5Ni steel which constitutes the low-pressure turbine rotor, and limiting the content to a minute amount, thereby suppressing changes in the structure of the metal which induces embrittlement over time, such as grain boundary segregation of impurity elements caused by heating, and stably performing operations even if steam of 380°C or higher is introduced.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2006-170006
- the invention was made in view of the problems of the conventional technique, and the object thereof is to provide a low-pressure turbine rotor capable of maintaining mechanical strength characteristics, and without problems in terms of quality without increasing manufacturing costs and manufacturing days, even if high temperature steam is introduced into the low-pressure turbine.
- the present invention provides a low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine.
- the turbine rotor includes a member formed from 1CrMoV steel (hereinafter referred to as 1Cr steel), 2.25CrMoV steel (hereinafter referred to as 2.25Cr steel), or 10CrMoV steel (hereinafter referred to as 10Cr steel) arranged on a steam inlet side, and a member formed from 3.5Ni steel arranged on a steam outlet side, which are joined together by welding.
- 1Cr steel, 2.25Cr steel, and 10Cr steel are materials which have conventionally been used for high-pressure turbine rotors or intermediate-pressure turbine rotors, the material management methods are established, and also easily available. Moreover, the above materials have a more excellent high-temperature resistance than 3.5Ni steel.
- 3.5Ni steel has stress corrosion cracking (SCC) susceptibility lower than 1Cr steel and 2.25Cr steel. Additionally, 10Cr steel is more expensive than 3.5Ni steel.
- steam inlet side into which high-temperature steam is introduced includes a member formed from 1Cr steel, 2.25Cr steel, or 10Cr steel
- steam outlet side in which a flow passage (blade length) increases and higher strength is required includes a member formed from 3.5Ni steel, whereby it is possible to form a low-pressure turbine rotor which is excellent against high-temperature and stress corrosion cracking, and even if high-temperature steam is introduced, it is possible to maintain its mechanical strength characteristics and toughness.
- the embrittlement susceptibility of the whole low-pressure turbine rotor is almost the same as the conventional low-pressure turbine rotor the entirety of which is made of 3.5Ni steel.
- the embrittlement susceptibility of the whole low-pressure turbine rotor is superior to the conventional low-pressure turbine rotor the entirety of which is made of 3.5Ni steel. Therefore, the member on the steel inlet side is more preferably formed from 2.25Cr steel or 10Cr steel.
- a low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine.
- the turbine rotor includes a member arranged on a steam inlet side and a member arranged on a steam outlet side, which are joined together by welding, both the members are formed from 3.5Ni steel, and the member arranged on the steam inlet side is formed from low-impurity 3.5Ni steel.
- the low-impurity 3.5Ni steel arranged on the steam inlet side contains, by weight %, Si: 0.1% or less, Mn: 0.1% or less, and inevitable impurities, by weight %, containing 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.
- the member made of 3.5Ni steel the impurity content of which is reduced and limited to a minute amount for the steam inlet side into which high-temperature steam is introduced, it is possible to suppress changes in the metal structure which induce embrittlement over time, such as grain boundary segregation of impurity elements caused by heating, and even if steam of 380°C or higher is introduced, it is possible to stably perform operation.
- the low-pressure turbine rotor is used in a steam turbine facility where the inlet steam temperature of the low-pressure turbine is 380°C or higher, a region where the temperature of the steam passing through the low-pressure turbine becomes 380°C or higher includes the member arranged on the steam inlet side, and a region where the temperature of the steam passing through the low-pressure turbine is less than 380°C includes the member arranged on the steam outlet side.
- the normal 3.5Ni steel has a high possibility of inducing embrittlement over time, such as grain boundary segregation of impurity elements, if steam temperature becomes 380°C or higher.
- a region where steam temperature becomes 380°C or higher includes the member arranged on the steam inlet side, and a region where steam temperature is less than 380°C includes the member arranged on the steam outlet side, whereby the normal 3.5Ni steel does not contact steam of 380°C or higher, and it is possible to suppress embrittlement of a member formed from the 3.5Ni steel arranged on the steam outlet side.
- the low-pressure turbine rotor is used in a steam turbine facility where the inlet steam temperature of at least one of the high-pressure turbine and the intermediate-pressure turbine is 630°C or higher.
- the high-pressure turbine and the intermediate-pressure turbine are not enlarged, it is possible to reduce emissions of CO 2 from the steam turbine facility, and it is possible to improve the thermal efficiency of the steam turbine facility.
- FIG. 1 is a view illustrating the configuration of a steam turbine power generation facility in Embodiment 1.
- FIG. 1 a power generation facility composed of a steam turbine facility using a low-pressure turbine rotor of the invention will be described.
- FIG. 1 is an example of single-stage reheating, and the invention is also applied to implementation of double-stage reheating and a high temperature rise (630°C or higher) only by reheating, and is not particularly limited.
- the steam turbine power generation facility 10 illustrated in FIG. 1 mainly includes a high-pressure turbine 14, an intermediate-pressure turbine 12, a low-pressure turbine 16, a power generator 18, a condenser 20, and a boiler 24.
- the steam passes through in order of a boiler 24, a main steam pipe 26, the high-pressure turbine 14, a low-temperature reheat pipe 28, the boiler 24, the high-temperature reheat pipe 30, the intermediate-pressure turbine 12, a crossover pipe 32, the low-pressure turbine 16, the condenser 20, a water feed pump 22, and the boiler 24.
- the steam overheated to 630°C or higher in the boiler 24 is introduced into the high-pressure turbine 14 through the main steam pipe 26.
- the steam introduced into the high-pressure turbine 14 is exhausted and is returned to the boiler 24 through the low-temperature reheat pipe 28 after having performed expansion work.
- the steam returned to the boiler 24 is reheated in the boiler 24 and turned into steam of 630°C or higher, and is sent to the intermediate-pressure turbine 12 through the high-temperature reheat pipe 30.
- the steam introduced into the intermediate-pressure turbine 12 is exhausted, is turned into steam of about 400 to 430°C, and is sent to the low-pressure turbine 16 through the crossover pipe 32 after having performed expansion work.
- the steam introduced into the low-pressure turbine 16 is exhausted and is sent to the condenser 20 after having performed expansion work.
- the steam sent to the condenser 20 is condensed in the condenser 20, is increased in pressure in the water feed pump 22, and is returned to the boiler 24.
- the power generator 18 is rotationally driven by the expansion work
- FIG. 2 is a plan view schematically illustrating the configuration of the rotor used for the low-pressure turbine 16 in Embodiment 1.
- the low-pressure turbine rotor used for the steam turbine power generation facility as mentioned above will be described with reference to FIG. 2 .
- the low-pressure turbine rotor 16A includes one member (hereinafter referred to as chrome steel portion) 16a made of 1Cr steel, 2.25Cr steel, or 10Cr steel, and two members (hereinafter referred to as normal 3.5Ni steel portions) 16b and 16c made of 3.5Ni steel.
- the chrome steel portion 16a is joined to the normal 3.5Ni steel portions 16b and 16c, respectively, by welding at both ends thereof, thereby forming the low-pressure turbine rotor 16A integrated in order of the normal 3.5Ni steel portion 16b, the chrome steel portion 16a, and the normal 3.5Ni steel portion 16c from one end.
- chrome steel portion 16a is arranged at a position exposed to steam of 380°C or higher, and the normal 3.5Ni steel portions 16b and 16c are arranged at positions exposed to steam of less than 380°C.
- the chrome steel portion is formed from 1Cr steel, 2.25Cr, or 10Cr steel which has excellent in high-temperature resistance, and is easily available.
- the 1Cr steel may include, for example, a material having composition containing, by weight %, C: 0.2 to 0.4%, Si: 0.35% or less, Mn: 1.5% or less, Ni: 2.0% or less, Cr: 0.5 to 1.5%, Mo: 0.5 to 1.5%, V: 0.2 to 0.3%, and the balance: Fe with inevitable impurities.
- the 2.25Cr Steel may include, for example, a material having composition containing, by weight %, C: 0.2 to 0.35%, Si: 0.35% or less, Mn: 1.5% or less, Ni: 0.2 to 2.0%, Cr: 1.5 to 3.0%, Mo: 0.9 to 1.5%, V: 0.2 to 0.3%, and the balance: Fe with inevitable impurities.
- the 10Cr steel may include, for example, a material having composition containing, by weight %, C: 0.05 to 0.4%, Si: 0.35% or less, Mn: 2.0% or less, Ni: 3.0% or less, Cr: 7 to 13%, Mo: 0.1 to 3.0%, V: 0.01 to 0.5%, N: 0.01 to 0.1%, Nb: 0.01 to 0.2%, and the balance: Fe with inevitable impurities.
- the 10Cr steel of another example may include, for example, a material having composition containing, by weight %, C: 0.05 to 0.4%, Si: 0.35% or less, Mn: 2.0% or less, Ni: 7.0% or less, Cr: 8 to 15%, Mo: 0.1 to 3.0%, V: 0.01 to 0.5%, N: 0.01 to 0.1%, Nb: 0.2% or less, and the balance: Fe with inevitable impurities.
- FIG. 4 is a graph illustrating the embrittlement factor of 1Cr steel, 2.25Cr steel, 10Cr steel, and 3.5Ni steel.
- the ordinate axis represents embrittlement factors ( ⁇ FATT), and values used as the index of the easiness of embrittlement. As the numeric value of this factor is higher, susceptibility to embrittlement is higher and embrittlement is easier.
- the abscissa axis represents J-Factors and values used as the index of the concentration of impurities. As is clear from FIG. 4 , materials easily embrittle as the impurity concentration increases. Moreover, 1Cr steel and 3.5Ni steel have almost the same embrittlement factors, the embrittlement factor of 2.25Cr steel is lower than that, and the embrittlement factor of 10Cr steel is lower still.
- the chrome steel portion 16a is more preferably formed from 2.25Cr steel or 10Cr steel.
- the 3.5Ni steel may include, for example, a material having composition containing, by weight %, C:0.4% or less, Si: 0.35% or less, Mn: 1.0% or less, Cr: 1.0 to 2.5%, V: 0.01 to 0.3%, Mo: 0.1 to 1.5%, Ni: 3.0 to 4.5%, and the balance: Fe with inevitable impurities.
- Joining is made by welded portions between the chrome steel portion 16a and the normal 3.5Ni steel portions 16b and 16c by welding.
- the method of the welding is not particularly limited if the welded portions are able to withstand the operational conditions of the low-pressure turbine, it is possible to include a general welding method of supplying a weld wire to an arc generated by a welding torch as an example as a filler.
- a narrow groove welding joint, etc. is adopted as the shape of the welded portions.
- a filler supplied as a weld wire by melting caused by an arc is laminated for every single pass, and the filler is filled into the narrow groove welding joint, thereby joining together the chrome steel portion 16a and the normal 3.5Ni steel portions 16b and 16c.
- the 3.5Ni steel that is the same material as the normal 3.5Ni steel portion is used as the filler.
- 1Cr steel, 2.25Cr steel, and 10Cr steel are materials which have conventionally been used for high-pressure turbine rotors or intermediate-pressure turbine rotors, the materials management methods are established, and also easily available. Moreover, the above materials have more excellent high-temperature resistance than 3.SNi steel. Additionally, 3.5Ni steel has stress corrosion cracking (SCC) susceptibility lower than 1Cr steel, 2.25Cr steel, and 10Cr steel.
- SCC stress corrosion cracking
- steam inlet side into which high-temperature steam is introduced includes a member formed from 1Cr steel, 2.25Cr steel, or 10Cr steel
- steam outlet side in which a flow passage diameter (blade diameter) increases and higher strength is required includes a member formed from 3.5Ni steel, whereby it is possible to form a low-pressure turbine rotor which is excellent against high-temperature and stress corrosion cracking, and even if high-temperature steam is introduced, it is possible to maintain its mechanical strength characteristics.
- the normal 3.5Ni steel has a high possibility of inducing embrittlement over time, such as grain boundary segregation of impurity elements, if the steam temperature becomes 380°C or higher.
- a region where the steam temperature becomes 380°C or higher includes a member arranged on the steam inlet side, and a region where steam temperature is less than 380°C includes a member arranged on the steam outlet side, whereby the normal 3.5Ni: steel does not contact the steam of 380°C or higher, and it is possible to suppress embrittlement of a member formed from the 3.5Ni steel arranged on the steam outlet side.
- Embodiment 2 a low-pressure turbine rotor 16B of another form will be described.
- the low-pressure turbine rotor 16B includes one member (referred to as a low-impurity 3.5Ni steel portion) 16d made of low-impurity 3.5Ni steel with little impurity content, and the normal 3.5Ni steel portions 16b and 16c.
- Embodiment 2 is a form in which the low-impurity 3.5Ni steel portion 16d is adopted instead of the chrome steel portion 16a of the low-pressure turbine rotor with the form of Embodiment 1 illustrated in FIG. 2 .
- the description thereof is omitted.
- the low-impurity 3.5Ni steel portion 16d is arranged at a position exposed to steam of 380°C or higher, and the normal 3.5Ni steel portions 16b and 16c are arranged at positions exposed to steam of less than 380°C.
- the low-impurity 3.5Ni steel portion 16d is formed from a 3.5Ni steel portion with little impurity content.
- the low-impurity 3.5Ni steel portion 16d may include, for example, a material having composition containing, by weight %, C: 0.4% or less, Si: 0.1% or less, Mn: 0.1% or less, Cr : 1.0 to 2.5%, V: 0.01 to 0.3%, Mo: 0.1 to 1.5%, Ni: 3.0 to 4.5%, and the balance: Fe with inevitable impurities, and the inevitable impurities contain, by weight %, 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.
- Joining is made by welded portions between the low-impurity 3.5Ni steel portion 16d and the normal 3.5Ni steel portions 16b and 16c by welding.
- the member 16d made of low-impurity 3.5Ni steel the impurity content of which is reduced and limited to a minute amount for the steam inlet side into which high-temperature steam is introduced, it is possible to suppress changes in metal structure which induces embrittlement over time, such as grain boundary segregation of impurity elements caused by heating, and even if the steam of 380°C or higher is introduced, it is possible to stably perform operation.
- the normal 3.5Ni steel has a high possibility of inducing embrittlement over time, such as grain boundary segregation of impurity elements, if steam temperature becomes 380°C or higher.
- a region where steam temperature becomes 380°C or higher includes the member arranged on the steam inlet side, and a region where steam temperature is less than 380°C includes the member arranged on the steam outlet side, whereby the normal 3.5Ni steel does not contact the steam of 380°C or higher, and it is possible to suppress embrittlement of a member formed from the 3.5Ni steel arranged on the steam outlet side.
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Abstract
Description
- The present invention relates to a low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, and particularly, to a low-pressure turbine rotor suitably used in a steam turbine facility in which the steam inlet temperature attains a high-temperature of 380°C or higher.
- Three methods of atomic power, thermal power, and hydraulic power generation, are now used as main power generation methods, and from a viewpoint of resource quantity and energy density, the three power generation methods are also expected to be used as main power generation methods in the future. Especially, since thermal power generation is safe and its utility value is high as a power generation method with a high capacity to respond to load change, it is expected that thermal power generation will also continue to play an important role in the power generation field in the future.
- A steam turbine facility used for coal-fired thermal power generation including a steam turbine, generally has a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, and steam in the range of 600°C is used for the steam turbine facility. In such a steam turbine facility, steam in the 600°C range supplied from a boiler is introduced into the high-pressure turbine in a high-pressure blade stage composed of blades and a vanes to rotate the high-pressure turbine to perform expansion work. Thereafter, the steam is exhausted from the high-pressure turbine and is introduced into the intermediate-pressure turbine to rotate the intermediate-pressure turbine to perform expansion work, similarly to the high-pressure turbine. Further, the steam is introduced into the low-pressure turbine to perform expansion work and is exhausted and condensed to a condenser.
- Generally the low-pressure turbine rotor in such a steam turbine facility is formed from 3.5Ni steel (for example, 3.5NiCrMoV steel, etc.), and the inlet steam temperature of the low-pressure turbine was set to 380°C or lower that is a temperature such that 3.5Ni steel is able to maintain mechanical strength characteristics and toughness.
- In the above steam turbine facility, a technique adopting a steam condition of 630°C or higher is recently required in order to reduce emissions of CO2 and further improve thermal efficiency.
- If steam of 630°C or higher is introduced into the high-pressure turbine, and the same high-pressure turbine and intermediate-pressure turbine as a conventional case using steam in the 600°C range are used, there is a possibility that the inlet steam temperature of the low-pressure turbine may rise as high as about 400 to 430°C, greater than conventional, and the rotor of the low-pressure turbine is not able to maintain its mechanical strength characteristics and toughness due to the rise in temperature.
- Especially, in the case of double-stage reheating, second-stage reheating pressure becomes low. Thus, the inlet steam temperature of the low pressure turbine of the double-stage reheating rises higher than single-stage reheating, and design conditions become strict.
- In order to maintain the mechanical strength characteristics and toughness of the low-pressure turbine rotor using steam of 630°C or higher and formed from 3.5Ni steel, it is considered that the expansion work amounts in the high-pressure turbine and the intermediate-pressure turbine are increased higher than ever before to reduce the steam temperature at the inlet of the low-pressure turbine to 380°C or lower. However, for that purpose it is necessary to increase the number of blade stages of the high-pressure turbine and the intermediate-pressure turbine, and there is a problem that the whole turbine becomes enlarged.
- Thus,
Patent Document 1 disclosed a low-pressure turbine rotor capable of reducing the content of impurities contained in 3.5Ni steel which constitutes the low-pressure turbine rotor, and limiting the content to a minute amount, thereby suppressing changes in the structure of the metal which induces embrittlement over time, such as grain boundary segregation of impurity elements caused by heating, and stably performing operations even if steam of 380°C or higher is introduced. - Stricter impurity management than ever before is required in the technique disclosed in
Patent Document 1. However, especially, the low-pressure turbine rotor is large-sized. Therefore, when an integral low-pressure turbine rotor is used in the technique disclosed inPatent Document 1, a problem occurs in that reliability in terms of quality of a turbine rotor to be manufactured remains unstable such that cost increases, manufacturing days increase and delivery dates become delayed, and the content of impurities exceeds a criteria, for example, due to dispersion. - [Patent Document 1] Japanese Patent Application Laid-Open No.
2006-170006 - Accordingly, the invention was made in view of the problems of the conventional technique, and the object thereof is to provide a low-pressure turbine rotor capable of maintaining mechanical strength characteristics, and without problems in terms of quality without increasing manufacturing costs and manufacturing days, even if high temperature steam is introduced into the low-pressure turbine.
- In order to solve the above problem, the present invention provides a low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine. The turbine rotor includes a member formed from 1CrMoV steel (hereinafter referred to as 1Cr steel), 2.25CrMoV steel (hereinafter referred to as 2.25Cr steel), or 10CrMoV steel (hereinafter referred to as 10Cr steel) arranged on a steam inlet side, and a member formed from 3.5Ni steel arranged on a steam outlet side, which are joined together by welding.
- Since 1Cr steel, 2.25Cr steel, and 10Cr steel are materials which have conventionally been used for high-pressure turbine rotors or intermediate-pressure turbine rotors, the material management methods are established, and also easily available. Moreover, the above materials have a more excellent high-temperature resistance than 3.5Ni steel.
- Additionally, 3.5Ni steel has stress corrosion cracking (SCC) susceptibility lower than 1Cr steel and 2.25Cr steel. Additionally, 10Cr steel is more expensive than 3.5Ni steel.
- Thus, steam inlet side into which high-temperature steam is introduced includes a member formed from 1Cr steel, 2.25Cr steel, or 10Cr steel, and steam outlet side in which a flow passage (blade length) increases and higher strength is required includes a member formed from 3.5Ni steel, whereby it is possible to form a low-pressure turbine rotor which is excellent against high-temperature and stress corrosion cracking, and even if high-temperature steam is introduced, it is possible to maintain its mechanical strength characteristics and toughness.
- Moreover, although 3.5Ni steel and 1Cr steel are almost the same from the viewpoint of embrittlement, 2.25Cr steel and 10Cr steel are superior to 3.5Ni steel. Accordingly, if a member made of 1Cr steel is used for the steam inlet side, the embrittlement susceptibility of the whole low-pressure turbine rotor is almost the same as the conventional low-pressure turbine rotor the entirety of which is made of 3.5Ni steel. However, if a member made of 2.25Cr steel or 10Cr steel is used for the steam inlet side, the embrittlement susceptibility of the whole low-pressure turbine rotor is superior to the conventional low-pressure turbine rotor the entirety of which is made of 3.5Ni steel. Therefore, the member on the steel inlet side is more preferably formed from 2.25Cr steel or 10Cr steel.
- Additionally, there is provided a low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine. The turbine rotor includes a member arranged on a steam inlet side and a member arranged on a steam outlet side, which are joined together by welding, both the members are formed from 3.5Ni steel, and the member arranged on the steam inlet side is formed from low-impurity 3.5Ni steel.
- Additionally, the low-impurity 3.5Ni steel arranged on the steam inlet side contains, by weight %, Si: 0.1% or less, Mn: 0.1% or less, and inevitable impurities, by weight %, containing 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 using the member made of 3.5Ni steel the impurity content of which is reduced and limited to a minute amount for the steam inlet side into which high-temperature steam is introduced, it is possible to suppress changes in the metal structure which induce embrittlement over time, such as grain boundary segregation of impurity elements caused by heating, and even if steam of 380°C or higher is introduced, it is possible to stably perform operation.
- Moreover, by using a member made of 3.5Ni steel the impurity content of which is reduced not for the whole rotor but for the steam inlet side into which high-temperature steam is introduced, it is possible to fabricate a low-pressure turbine rotor in which an increase in manufacturing costs and manufacturing days is suppressed, and the uncertainness in reliability in terms of quality is also small.
- Additionally, the low-pressure turbine rotor is used in a steam turbine facility where the inlet steam temperature of the low-pressure turbine is 380°C or higher,
a region where the temperature of the steam passing through the low-pressure turbine becomes 380°C or higher includes the member arranged on the steam inlet side, and a region where the temperature of the steam passing through the low-pressure turbine is less than 380°C includes the member arranged on the steam outlet side. - The normal 3.5Ni steel has a high possibility of inducing embrittlement over time, such as grain boundary segregation of impurity elements, if steam temperature becomes 380°C or higher. Thus, a region where steam temperature becomes 380°C or higher includes the member arranged on the steam inlet side, and a region where steam temperature is less than 380°C includes the member arranged on the steam outlet side, whereby the normal 3.5Ni steel does not contact steam of 380°C or higher, and it is possible to suppress embrittlement of a member formed from the 3.5Ni steel arranged on the steam outlet side.
- The low-pressure turbine rotor is used in a steam turbine facility where the inlet steam temperature of at least one of the high-pressure turbine and the intermediate-pressure turbine is 630°C or higher.
- Thereby, the high-pressure turbine and the intermediate-pressure turbine are not enlarged, it is possible to reduce emissions of CO2 from the steam turbine facility, and it is possible to improve the thermal efficiency of the steam turbine facility.
- As described above, according to the invention, it is possible to provide a low-pressure turbine rotor capable of maintaining mechanical strength characteristics, and without problems in terms of quality without increasing manufacturing costs and manufacturing days, even if high temperature steam is introduced into the low-pressure turbine.
-
- [
FIG. 1] FIG. 1 is a view illustrating the configuration of a steam turbine power generation facility in Embodiment 1. - [
FIG. 2] FIG. 2 is a plan view schematically illustrating the configuration of a low-pressure turbine rotor inEmbodiment 1. - [
FIG. 3] FIG. 3 is a plan view schematically illustrating the configuration of a low-pressure turbine rotor in Embodiment 2. - [
FIG. 4] FIG. 4 is a graph illustrating the embrittlement factors of 1Cr steel, 2.25Cr steel, 10Cr steel, and 3.5Ni steel. - Preferred examples of the invention will be illustratively described below in detail with reference to the drawings. Here, the dimensions, materials, shapes, relative arrangements, etc. of component parts described in this example are not meant to limit the scope of the invention, but are merely simple explanatory examples, as long as there is no specific description of limitations.
-
FIG. 1 is a view illustrating the configuration of a steam turbine power generation facility in Embodiment 1. - With reference to
FIG. 1 , a power generation facility composed of a steam turbine facility using a low-pressure turbine rotor of the invention will be described. In addition,FIG. 1 is an example of single-stage reheating, and the invention is also applied to implementation of double-stage reheating and a high temperature rise (630°C or higher) only by reheating, and is not particularly limited. - The steam turbine
power generation facility 10 illustrated inFIG. 1 mainly includes a high-pressure turbine 14, an intermediate-pressure turbine 12, a low-pressure turbine 16, apower generator 18, acondenser 20, and aboiler 24. The steam passes through in order of aboiler 24, amain steam pipe 26, the high-pressure turbine 14, a low-temperature reheat pipe 28, theboiler 24, the high-temperature reheat pipe 30, the intermediate-pressure turbine 12, acrossover pipe 32, the low-pressure turbine 16, thecondenser 20, awater feed pump 22, and theboiler 24. - The steam overheated to 630°C or higher in the
boiler 24 is introduced into the high-pressure turbine 14 through themain steam pipe 26. The steam introduced into the high-pressure turbine 14 is exhausted and is returned to theboiler 24 through the low-temperature reheat pipe 28 after having performed expansion work. The steam returned to theboiler 24 is reheated in theboiler 24 and turned into steam of 630°C or higher, and is sent to the intermediate-pressure turbine 12 through the high-temperature reheat pipe 30. The steam introduced into the intermediate-pressure turbine 12 is exhausted, is turned into steam of about 400 to 430°C, and is sent to the low-pressure turbine 16 through thecrossover pipe 32 after having performed expansion work. The steam introduced into the low-pressure turbine 16 is exhausted and is sent to thecondenser 20 after having performed expansion work. The steam sent to thecondenser 20 is condensed in thecondenser 20, is increased in pressure in thewater feed pump 22, and is returned to theboiler 24. Thepower generator 18 is rotationally driven by the expansion work of each turbine to generate power. -
FIG. 2 is a plan view schematically illustrating the configuration of the rotor used for the low-pressure turbine 16 inEmbodiment 1. - The low-pressure turbine rotor used for the steam turbine power generation facility as mentioned above will be described with reference to
FIG. 2 . - First, the configuration of the rotor according to this example used for the low-
pressure turbine 16 into which steam of about 400 to 430°C is introduced will be described with reference toFIG. 2 . - As illustrated in
FIG. 2 , the low-pressure turbine rotor 16A includes one member (hereinafter referred to as chrome steel portion) 16a made of 1Cr steel, 2.25Cr steel, or 10Cr steel, and two members (hereinafter referred to as normal 3.5Ni steel portions) 16b and 16c made of 3.5Ni steel. - The
chrome steel portion 16a is joined to the normal 3.5Ni steel portions pressure turbine rotor 16A integrated in order of the normal 3.5Ni steel portion 16b, thechrome steel portion 16a, and the normal 3.5Ni steel portion 16c from one end. - Additionally, the
chrome steel portion 16a is arranged at a position exposed to steam of 380°C or higher, and the normal 3.5Ni steel portions - Next, the materials of the
chrome steel portion 16a and the 3.5Ni steel portions pressure turbine rotor 16A, will be described. - The chrome steel portion is formed from 1Cr steel, 2.25Cr, or 10Cr steel which has excellent in high-temperature resistance, and is easily available.
- The 1Cr steel may include, for example, a material having composition containing, by weight %, C: 0.2 to 0.4%, Si: 0.35% or less, Mn: 1.5% or less, Ni: 2.0% or less, Cr: 0.5 to 1.5%, Mo: 0.5 to 1.5%, V: 0.2 to 0.3%, and the balance: Fe with inevitable impurities.
- The 2.25Cr Steel may include, for example, a material having composition containing, by weight %, C: 0.2 to 0.35%, Si: 0.35% or less, Mn: 1.5% or less, Ni: 0.2 to 2.0%, Cr: 1.5 to 3.0%, Mo: 0.9 to 1.5%, V: 0.2 to 0.3%, and the balance: Fe with inevitable impurities.
- The 10Cr steel may include, for example, a material having composition containing, by weight %, C: 0.05 to 0.4%, Si: 0.35% or less, Mn: 2.0% or less, Ni: 3.0% or less, Cr: 7 to 13%, Mo: 0.1 to 3.0%, V: 0.01 to 0.5%, N: 0.01 to 0.1%, Nb: 0.01 to 0.2%, and the balance: Fe with inevitable impurities.
- The 10Cr steel of another example may include, for example, a material having composition containing, by weight %, C: 0.05 to 0.4%, Si: 0.35% or less, Mn: 2.0% or less, Ni: 7.0% or less, Cr: 8 to 15%, Mo: 0.1 to 3.0%, V: 0.01 to 0.5%, N: 0.01 to 0.1%, Nb: 0.2% or less, and the balance: Fe with inevitable impurities.
-
FIG. 4 is a graph illustrating the embrittlement factor of 1Cr steel, 2.25Cr steel, 10Cr steel, and 3.5Ni steel. The ordinate axis represents embrittlement factors (ΔFATT), and values used as the index of the easiness of embrittlement. As the numeric value of this factor is higher, susceptibility to embrittlement is higher and embrittlement is easier. The abscissa axis represents J-Factors and values used as the index of the concentration of impurities. As is clear fromFIG. 4 , materials easily embrittle as the impurity concentration increases. Moreover, 1Cr steel and 3.5Ni steel have almost the same embrittlement factors, the embrittlement factor of 2.25Cr steel is lower than that, and the embrittlement factor of 10Cr steel is lower still. - Accordingly, if a member made of 1Cr steel is used for the
chrome steel portion 16a, it can be said that the embrittlement susceptibility of the whole low-pressure turbine rotor is almost the same as the conventional low-pressure turbine rotor in which the whole rotor is made of 3.5Ni steel. However, if members made of 2.25Cr steel or 10Cr steel are used for thechrome steel portions chrome steel portion 16a is more preferably formed from 2.25Cr steel or 10Cr steel. - The 3.5Ni steel may include, for example, a material having composition containing, by weight %, C:0.4% or less, Si: 0.35% or less, Mn: 1.0% or less, Cr: 1.0 to 2.5%, V: 0.01 to 0.3%, Mo: 0.1 to 1.5%, Ni: 3.0 to 4.5%, and the balance: Fe with inevitable impurities.
- Joining is made by welded portions between the
chrome steel portion 16a and the normal 3.5Ni steel portions - Although the method of the welding is not particularly limited if the welded portions are able to withstand the operational conditions of the low-pressure turbine, it is possible to include a general welding method of supplying a weld wire to an arc generated by a welding torch as an example as a filler.
- For example, a narrow groove welding joint, etc. is adopted as the shape of the welded portions. In welding, a filler supplied as a weld wire by melting caused by an arc is laminated for every single pass, and the filler is filled into the narrow groove welding joint, thereby joining together the
chrome steel portion 16a and the normal 3.5Ni steel portions - The following effects are obtained by using the low-pressure turbine rotor described above.
- Since 1Cr steel, 2.25Cr steel, and 10Cr steel are materials which have conventionally been used for high-pressure turbine rotors or intermediate-pressure turbine rotors, the materials management methods are established, and also easily available. Moreover, the above materials have more excellent high-temperature resistance than 3.SNi steel. Additionally, 3.5Ni steel has stress corrosion cracking (SCC) susceptibility lower than 1Cr steel, 2.25Cr steel, and 10Cr steel. Thus, steam inlet side into which high-temperature steam is introduced includes a member formed from 1Cr steel, 2.25Cr steel, or 10Cr steel, and steam outlet side in which a flow passage diameter (blade diameter) increases and higher strength is required includes a member formed from 3.5Ni steel, whereby it is possible to form a low-pressure turbine rotor which is excellent against high-temperature and stress corrosion cracking, and even if high-temperature steam is introduced, it is possible to maintain its mechanical strength characteristics.
- Additionally, the normal 3.5Ni steel has a high possibility of inducing embrittlement over time, such as grain boundary segregation of impurity elements, if the steam temperature becomes 380°C or higher. Thus, a region where the steam temperature becomes 380°C or higher includes a member arranged on the steam inlet side, and a region where steam temperature is less than 380°C includes a member arranged on the steam outlet side, whereby the normal 3.5Ni: steel does not contact the steam of 380°C or higher, and it is possible to suppress embrittlement of a member formed from the 3.5Ni steel arranged on the steam outlet side.
- Moreover, since it is possible to maintain the mechanical strength characteristics of the low-pressure turbine rotor even if the inlet steam temperature of the low-pressure turbine is made higher than ever before, it is possible to use steam of 630°C or higher without enlarging the high-pressure turbine and the intermediate-pressure turbine, it is possible to reduce emissions of CO2 from the steam turbine facility, and it is possible to improve the thermal efficiency of the steam turbine facility.
- In Embodiment 2, a low-
pressure turbine rotor 16B of another form will be described. - In Embodiment 2, as illustrated in
FIG. 3 , the low-pressure turbine rotor 16B includes one member (referred to as a low-impurity 3.5Ni steel portion) 16d made of low-impurity 3.5Ni steel with little impurity content, and the normal 3.5Ni steel portions - That is, Embodiment 2 is a form in which the low-impurity 3.5
Ni steel portion 16d is adopted instead of thechrome steel portion 16a of the low-pressure turbine rotor with the form ofEmbodiment 1 illustrated inFIG. 2 . Hereinafter, since configurations other than the low-impurity 3.5Ni steel portion 16d are the same as those ofEmbodiment 1, the description thereof is omitted. - Additionally, the low-impurity 3.5
Ni steel portion 16d is arranged at a position exposed to steam of 380°C or higher, and the normal 3.5Ni steel portions - The materials of the low-impurity 3.5
Ni steel portion 16d will be described. - The low-impurity 3.5
Ni steel portion 16d is formed from a 3.5Ni steel portion with little impurity content. The low-impurity 3.5Ni steel portion 16d may include, for example, a material having composition containing, by weight %, C: 0.4% or less, Si: 0.1% or less, Mn: 0.1% or less, Cr : 1.0 to 2.5%, V: 0.01 to 0.3%, Mo: 0.1 to 1.5%, Ni: 3.0 to 4.5%, and the balance: Fe with inevitable impurities, and the inevitable impurities contain, by weight %, 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. - Joining is made by welded portions between the low-impurity 3.5
Ni steel portion 16d and the normal 3.5Ni steel portions - As illustrated in
FIG. 4 , as the 3.5Ni steel has lower impurity concentration, embrittlement susceptibility is lower and embrittlement hardly occurs. - Accordingly, by using the
member 16d made of low-impurity 3.5Ni steel the impurity content of which is reduced and limited to a minute amount for the steam inlet side into which high-temperature steam is introduced, it is possible to suppress changes in metal structure which induces embrittlement over time, such as grain boundary segregation of impurity elements caused by heating, and even if the steam of 380°C or higher is introduced, it is possible to stably perform operation. - Moreover, by using a member made of 3.5Ni steel the impurity content of which is reduced not for the whole rotor but for the steam inlet side into which high-temperature steam is introduced, it is possible to fabricate a low-pressure turbine rotor in which an increase in manufacturing costs and manufacturing days is suppressed, and the instability of reliability in terms of quality is also small.
- Additionally, the normal 3.5Ni steel has a high possibility of inducing embrittlement over time, such as grain boundary segregation of impurity elements, if steam temperature becomes 380°C or higher. Thus, a region where steam temperature becomes 380°C or higher includes the member arranged on the steam inlet side, and a region where steam temperature is less than 380°C includes the member arranged on the steam outlet side, whereby the normal 3.5Ni steel does not contact the steam of 380°C or higher, and it is possible to suppress embrittlement of a member formed from the 3.5Ni steel arranged on the steam outlet side.
- Moreover, since it is possible to maintain the mechanical strength characteristics of the low-pressure turbine rotor even if the inlet steam temperature of the low-pressure turbine is made higher than ever before, it is possible to use the steam of 630°C or higher without enlarging the high-pressure turbine and the intermediate-pressure turbine, it is possible to reduce emissions of CO2 from the steam turbine facility, and it is possible to improve the thermal efficiency of the steam turbine facility.
- It is possible to utilize the invention as a low-pressure turbine rotor capable of maintaining its mechanical strength characteristics, and without problems in terms of quality, without increasing manufacturing costs and manufacturing days, even if high temperature steam is introduced into the low-pressure turbine.
Claims (5)
- A low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine,
the turbine rotor comprising a member formed from 1CrMoV steel, 2.25CrMoV steel, or 10CrMoV steel arranged on a steam inlet side, and a member formed from 3.5Ni steel arranged on a steam outlet side, which are joined together by welding. - A low-pressure turbine rotor used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine,
the turbine rotor comprising a member arranged on a steam inlet side and a member arranged on a steam outlet side, which are joined together by welding, both the members being formed from 3.5Ni steel, and the member arranged on the steam inlet side being formed from low-impurity 3.5Ni steel. - The low-pressure turbine rotor according to Claim 2,
wherein the low-impurity 3.5Ni steel arranged on the steam inlet side contains, by weight %, Si: 0.1% or less, Mn: 0.1% or less, and inevitable impurities, by weight %, containing 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. - The low-pressure turbine rotor according to Claim 1 or 2,
wherein the low-pressure turbine rotor is used in a steam turbine facility where the inlet steam temperature of the low-pressure turbine is 380°C or higher,
a region where the temperature of the steam passing through the low-pressure turbine attains temperatures of 380°C or higher includes the member arranged on the steam inlet side, and
a region where the temperature of the steam passing through the low-pressure turbine is less than 380°C includes the member arranged on the steam outlet side. - The low-pressure turbine rotor according to any one of Claims 1 to 4,
wherein the low-pressure turbine rotor is used in a steam turbine facility where the inlet steam temperature of at least one of the high-pressure turbine and the intermediate-pressure turbine is 630°C or higher.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2008207421 | 2008-08-11 | ||
PCT/JP2009/063896 WO2010018773A1 (en) | 2008-08-11 | 2009-07-30 | Rotor for low-pressure turbine |
Publications (2)
Publication Number | Publication Date |
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EP2312127A1 true EP2312127A1 (en) | 2011-04-20 |
EP2312127A4 EP2312127A4 (en) | 2015-01-07 |
Family
ID=41668918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP09806066.8A Withdrawn EP2312127A4 (en) | 2008-08-11 | 2009-07-30 | Rotor for low-pressure turbine |
Country Status (6)
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US (1) | US20100202891A1 (en) |
EP (1) | EP2312127A4 (en) |
JP (1) | JP4995317B2 (en) |
KR (2) | KR20130051014A (en) |
CN (1) | CN101772622A (en) |
WO (1) | WO2010018773A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012207594A (en) * | 2011-03-30 | 2012-10-25 | Mitsubishi Heavy Ind Ltd | Rotor of rotary machine, and rotary machine |
US20130323075A1 (en) * | 2012-06-04 | 2013-12-05 | General Electric Company | Nickel-chromium-molybdenum-vanadium alloy and turbine component |
EP3269924A1 (en) * | 2016-07-14 | 2018-01-17 | Siemens Aktiengesellschaft | Rotating shaft and method for producing a rotating shaft |
Citations (5)
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US4962586A (en) * | 1989-11-29 | 1990-10-16 | Westinghouse Electric Corp. | Method of making a high temperature - low temperature rotor for turbines |
EP0964135A2 (en) * | 1998-06-09 | 1999-12-15 | Mitsubishi Heavy Industries, Ltd. | Steam turbine rotor welded together from different materials |
WO2007073976A1 (en) * | 2005-12-22 | 2007-07-05 | Alstom Technology Ltd | Method of producing a welded rotor of a low-pressure steam turbine by means of build-up welding and stress-free annealing |
EP1860279A1 (en) * | 2006-05-26 | 2007-11-28 | Siemens Aktiengesellschaft | Welded LP-turbine shaft |
EP1911932A2 (en) * | 2006-10-04 | 2008-04-16 | Kabushiki Kaisha Toshiba | Turbine rotor and steam turbine |
Family Cites Families (10)
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JPS57126958A (en) * | 1981-01-28 | 1982-08-06 | Toshiba Corp | Low alloy steel for rotor |
JPS57176305A (en) * | 1981-04-24 | 1982-10-29 | Hitachi Ltd | Steam turbine rotor |
JP3315800B2 (en) * | 1994-02-22 | 2002-08-19 | 株式会社日立製作所 | Steam turbine power plant and steam turbine |
JP3905739B2 (en) * | 2001-10-25 | 2007-04-18 | 三菱重工業株式会社 | 12Cr alloy steel for turbine rotor, method for producing the same, and turbine rotor |
JP2003145271A (en) * | 2001-11-13 | 2003-05-20 | Mitsubishi Heavy Ind Ltd | Method for welding different kinds of steel grades |
JP2006170006A (en) * | 2004-12-14 | 2006-06-29 | Toshiba Corp | Steam turbine power generation system and low pressure turbine rotor |
JP4783053B2 (en) * | 2005-04-28 | 2011-09-28 | 株式会社東芝 | Steam turbine power generation equipment |
JP2007278064A (en) * | 2006-04-03 | 2007-10-25 | Hitachi Ltd | Steam turbine welded rotor and method of manufacturing it, and steam turbine and power generating plant using it |
JP4805728B2 (en) * | 2006-05-31 | 2011-11-02 | 株式会社東芝 | Steam turbine rotor and steam turbine |
JP5011931B2 (en) * | 2006-10-06 | 2012-08-29 | 株式会社日立製作所 | Steam turbine welding rotor |
-
2009
- 2009-07-30 KR KR1020137009982A patent/KR20130051014A/en active Search and Examination
- 2009-07-30 EP EP09806066.8A patent/EP2312127A4/en not_active Withdrawn
- 2009-07-30 KR KR1020107002529A patent/KR20100033421A/en active Application Filing
- 2009-07-30 WO PCT/JP2009/063896 patent/WO2010018773A1/en active Application Filing
- 2009-07-30 US US12/674,022 patent/US20100202891A1/en not_active Abandoned
- 2009-07-30 JP JP2010502367A patent/JP4995317B2/en not_active Expired - Fee Related
- 2009-07-30 CN CN200980100092A patent/CN101772622A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4962586A (en) * | 1989-11-29 | 1990-10-16 | Westinghouse Electric Corp. | Method of making a high temperature - low temperature rotor for turbines |
EP0964135A2 (en) * | 1998-06-09 | 1999-12-15 | Mitsubishi Heavy Industries, Ltd. | Steam turbine rotor welded together from different materials |
WO2007073976A1 (en) * | 2005-12-22 | 2007-07-05 | Alstom Technology Ltd | Method of producing a welded rotor of a low-pressure steam turbine by means of build-up welding and stress-free annealing |
EP1860279A1 (en) * | 2006-05-26 | 2007-11-28 | Siemens Aktiengesellschaft | Welded LP-turbine shaft |
EP1911932A2 (en) * | 2006-10-04 | 2008-04-16 | Kabushiki Kaisha Toshiba | Turbine rotor and steam turbine |
Non-Patent Citations (1)
Title |
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See also references of WO2010018773A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101772622A (en) | 2010-07-07 |
KR20100033421A (en) | 2010-03-29 |
JPWO2010018773A1 (en) | 2012-01-26 |
JP4995317B2 (en) | 2012-08-08 |
WO2010018773A1 (en) | 2010-02-18 |
KR20130051014A (en) | 2013-05-16 |
US20100202891A1 (en) | 2010-08-12 |
EP2312127A4 (en) | 2015-01-07 |
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