EP0896071A1 - Materiaux pour roue de turbine a vapeur, destines a etre utilises a des temperatures elevees - Google Patents

Materiaux pour roue de turbine a vapeur, destines a etre utilises a des temperatures elevees Download PDF

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Publication number
EP0896071A1
EP0896071A1 EP97947913A EP97947913A EP0896071A1 EP 0896071 A1 EP0896071 A1 EP 0896071A1 EP 97947913 A EP97947913 A EP 97947913A EP 97947913 A EP97947913 A EP 97947913A EP 0896071 A1 EP0896071 A1 EP 0896071A1
Authority
EP
European Patent Office
Prior art keywords
materials
inventive
steam turbine
turbine rotor
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97947913A
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German (de)
English (en)
Other versions
EP0896071A4 (fr
Inventor
Masatomo Mitsubishi Heavy Industries Ltd. KAMADA
Akitsugu Mitsubishi Heavy Industries Ltd. FUJITA
Kouji Japan Casting & Forging Corp. MORINAKA
Katsuo Japan Casting & Forging Corporation KAKU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0896071A1 publication Critical patent/EP0896071A1/fr
Publication of EP0896071A4 publication Critical patent/EP0896071A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Definitions

  • This invention relates to steam turbine rotor materials for use in thermal electric power generation.
  • High-temperature rotor materials for use in steam turbine plants for thermal electric power generation include CrMoV steel and 12Cr steel. Of these, the use of CrMoV steel is restricted to plants having a steam temperature up to 566°C because of its limited high-temperature strength. On the other hand, rotor materials based on 12Cr steel have more excellent high-temperature strength than CrMoV steel and can hence be used in plants having a steam temperature up to 593°C. However, if the steam temperature exceeds 593°C, such rotor materials have insufficient high-temperature strength and cannot be easily used for steam turbine rotors.
  • the present inventors made intensive investigations in order to improve high-temperature strength by using 12Cr steel as a basic material and adding carefully selected alloying elements thereto, and have now invented new steam turbine rotor materials for high-temperature applications which have excellent high-temperature properties.
  • inventive material (3) The reasons for content restrictions in the inventive material (3) are described below. However, the same explanations as those given in connection with the inventive material (1) are omitted. Here, the reason why no Ni is added as contrasted with the inventive materials (1) and (2) is explained.
  • inventive material (4) has the same composition as the inventive material (2), except that no Ni is added similarly to the aforesaid inventive material (3).
  • inventive material (3) has already been described in connection with the inventive materials (1) and (2) and are hence omitted here.
  • test materials were prepared by melting the components in a 50 kg vacuum high-frequency furnace. These test materials were hot-forged at a heating temperature of 1,200°C and then subjected to the following heat treatment. The heat treatment was carried out by hardening the test materials under conditions which simulated the central part of an oil-quenched rotor having a drum diameter of 1,200 mm, and then tempering them at a temperature which had been determined so as to give a 0.2% yield strength of about 68-74 kgf/mm 2 .
  • inventive materials (1) and comparative materials are shown in Table 2. Although there is little difference in the results of room-temperature tension tests, the elongation and reduction in area of comparative material Nos. 10, 14 and 19 are lower than those of the inventive materials (1). With respect to impact properties, comparative material Nos. 8-11, 14-17, 19 and 20 show lower values, revealing that the toughness of these comparative materials is lower than that of the inventive materials (1). Moreover, this table shows the rupture times obtained in creep rupture tests performed at a test temperature of 650°C and a stress of 15 kgf/mm 2 . It is evident from these results that the creep rupture strength of the inventive materials (1) is much more excellent than that of all comparative materials except No. 10.
  • compositions of inventive materials used for testing purposes are summarized in Table 3.
  • the compositions of inventive materials (2) are substantially the same as those of the inventive materials (1), except that the content of Mn is reduced as compared with the inventive materials (1).
  • all test materials were prepared by melting the components in a 50 kg vacuum high-frequency furnace. These test materials were hot-forged at a heating temperature of 1,200°C and then subjected to the following heat treatment. The heat treatment was carried out by hardening the test materials under conditions which simulated the central part of an oil-quenched rotor having a drum diameter of 1,200 mm, and then tempering them at a temperature which had been determined so as to give a 0.2% yield strength of about 68-74 kgf/mm 2 .
  • compositions of materials used for testing purposes are summarized in Table 5.
  • the compositions of inventive materials (3) are substantially the same as those of the inventive materials (1), except that Ni is completely eliminated from the inventive materials (1).
  • all test materials were prepared by melting the components in a 50 kg vacuum high-frequency furnace. These test materials were hot-forged at a heating temperature of 1,200°C and then subjected to the following heat treatment. The heat treatment was carried out by hardening the test materials under conditions which simulated the central part of an oil-quenched rotor having a drum diameter of 1,200 mm, and then tempering them at a temperature which had been determined so as to give a 0.2% yield strength of about 68-74 kgf/mm 2 .
  • inventive materials (3) and the inventive materials (1) used for comparative purposes are shown in Table 6. It is evident from this table that there is little difference in the results of room-temperature tension tests. With respect to impact properties, the inventive materials (3) show somewhat lower impact values than the corresponding inventive materials (1), because they have a lower Ni content. However, similarly to the inventive materials (2) having a lower Mn content, such reductions are slight and unworthy of serious consideration. On the other hand, a comparison of the creep rupture strengths reveals that, as a result of the elimination of Ni, the inventive materials (3) show a distinct improvement in creep rupture strength over the respective inventive materials (1).
  • compositions of materials used for testing purposes are summarized in Table 7.
  • the compositions of inventive materials (4) are substantially the same as those of the inventive materials (3), except that the content of Mn is reduced as compared with the inventive materials (3).
  • all test materials were prepared by melting the components in a 50 kg vacuum high-frequency furnace. These test materials were hot-forged at a heating temperature of 1,200°C and then subjected to the following heat treatment. The heat treatment was carried out by hardening the test materials under conditions which simulated the central part of an oil-quenched rotor having a drum diameter of 1,200 mm, and then tempering them at a temperature which had been determined so as to give a 0.2% yield strength of about 68-74 kgf/mm 2 .
  • inventive materials (5) were derived from some typical inventive materials (1) to (4) by adding B thereto.
  • inventive materials (5) Nos. 51 to 58 are based on the compositions of inventive material (1) Nos. 3 and 4, inventive material (2) Nos. 21 and 22, inventive material (3) Nos. 34 and 35, and inventive material (4) Nos. 41 and 42, except that B is added to the respective base materials.
  • inventive materials (1) to (4) all test materials were prepared by melting the components in a 50 kg vacuum high-frequency furnace. These test materials were hot-forged at a heating temperature of 1,200°C and then subjected to the following heat treatment.
  • the heat treatment was carried out by hardening the test materials under conditions which simulated the central part of an oil-quenched rotor having a drum diameter of 1,200 mm, and then tempering them at a temperature which had been determined so as to give a 0.2% yield strength of about 68-74 kgf/mm 2 .
  • inventive materials (6) were derived from some typical inventive materials (1) to (5) by replacing part or all of Hf and/or part of Fe with Nd.
  • inventive materials (6) Nos. 61 to 68 are based on the compositions of inventive material (1) No. 3, inventive material (2) No. 21, inventive material (3) No. 34, inventive material (4) No. 41, and inventive material (5) Nos. 52, 54, 56 and 58, except that part or all of Hf and/or part of Fe are replaced with Nd in the respective base materials.
  • further comparative materials (sample Nos. 71 and 72) were provided by adding Nd to inventive material Nos.
  • test materials were prepared by melting the components in a 50 kg vacuum high-frequency furnace. These test materials were hot-forged at a heating temperature of 1,200°C and then subjected to the following heat treatment. The heat treatment was carried out by hardening the test materials under conditions which simulated the central part of an oil-quenched rotor having a drum diameter of 1,200 mm, and then tempering them at a temperature which had been determined so as to give a 0.2% yield strength of about 68-74 kgf/mm 2 .
  • the steam turbine rotor materials for high-temperature applications in accordance with the present invention have excellent high-temperature strength and are hence useful as high-temperature steam turbine rotor materials for use in hypercritical-pressure electric power plants having a steam temperature higher than 593°C.
  • the present invention is useful in further raising the operating temperature of the current hypercritical-pressure electric power plants to afford a saving of fossil fuels and, moreover, to reduce the amount of carbon dioxide evolved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP97947913A 1997-01-08 1997-12-12 Materiaux pour roue de turbine a vapeur, destines a etre utilises a des temperatures elevees Withdrawn EP0896071A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP136097 1997-01-08
JP1360/97 1997-01-08
JP22324397A JP3245097B2 (ja) 1997-01-08 1997-08-20 高温用蒸気タービンロータ材
JP223243/97 1997-08-20
PCT/JP1997/004580 WO1998030727A1 (fr) 1997-01-08 1997-12-12 Materiaux pour roue de turbine a vapeur, destines a etre utilises a des temperatures elevees

Publications (2)

Publication Number Publication Date
EP0896071A1 true EP0896071A1 (fr) 1999-02-10
EP0896071A4 EP0896071A4 (fr) 2001-06-20

Family

ID=26334568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97947913A Withdrawn EP0896071A4 (fr) 1997-01-08 1997-12-12 Materiaux pour roue de turbine a vapeur, destines a etre utilises a des temperatures elevees

Country Status (4)

Country Link
EP (1) EP0896071A4 (fr)
JP (1) JP3245097B2 (fr)
CZ (1) CZ284998A3 (fr)
WO (1) WO1998030727A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001045A2 (fr) * 1997-07-16 2000-05-17 Mitsubishi Heavy Industries, Ltd. Acier coulé thérmoresistant
US7445069B2 (en) 2004-09-15 2008-11-04 Yamaha Hatsudoki Kabushiki Kaisha Vehicle control unit and vehicle
EP2157202A1 (fr) * 2007-06-04 2010-02-24 Sumitomo Metal Industries, Ltd. Acier ferrite résistant à la chaleur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04371552A (ja) * 1991-06-18 1992-12-24 Nippon Steel Corp 高強度フェライト系耐熱鋼
EP0691416A1 (fr) * 1994-06-13 1996-01-10 The Japan Steel Works, Ltd. Aciers résistant aux températures élevées
US5591391A (en) * 1994-09-20 1997-01-07 Sumitomo Metal Industries, Ltd. High chromium ferritic heat-resistant steel
EP0754774A1 (fr) * 1995-07-17 1997-01-22 Mitsubishi Jukogyo Kabushiki Kaisha Matériau à applications à hautes températures pour rotor de turbine à vapeur

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06306550A (ja) * 1993-04-28 1994-11-01 Toshiba Corp 耐熱鋼及びその熱処理方法
JP3531228B2 (ja) * 1994-09-20 2004-05-24 住友金属工業株式会社 高Crフェライト系耐熱鋼
JP3418884B2 (ja) * 1994-09-20 2003-06-23 住友金属工業株式会社 高Crフェライト系耐熱鋼
JPH08120414A (ja) * 1994-10-17 1996-05-14 Hitachi Ltd 耐熱鋼

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04371552A (ja) * 1991-06-18 1992-12-24 Nippon Steel Corp 高強度フェライト系耐熱鋼
EP0691416A1 (fr) * 1994-06-13 1996-01-10 The Japan Steel Works, Ltd. Aciers résistant aux températures élevées
US5591391A (en) * 1994-09-20 1997-01-07 Sumitomo Metal Industries, Ltd. High chromium ferritic heat-resistant steel
EP0754774A1 (fr) * 1995-07-17 1997-01-22 Mitsubishi Jukogyo Kabushiki Kaisha Matériau à applications à hautes températures pour rotor de turbine à vapeur

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 247 (C-1059), 18 May 1993 (1993-05-18) -& JP 04 371552 A (NIPPON STEEL CORP), 24 December 1992 (1992-12-24) *
See also references of WO9830727A1 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001045A2 (fr) * 1997-07-16 2000-05-17 Mitsubishi Heavy Industries, Ltd. Acier coulé thérmoresistant
EP1002885A2 (fr) * 1997-07-16 2000-05-24 Mitsubishi Heavy Industries, Ltd. Acier coulé thérmoresistant
EP1002885A3 (fr) * 1997-07-16 2000-09-06 Mitsubishi Heavy Industries, Ltd. Acier coulé thérmoresistant
EP1405931A2 (fr) * 1997-07-16 2004-04-07 Mitsubishi Heavy Industries, Ltd. Acier coulé thermorésistant
EP1405931A3 (fr) * 1997-07-16 2004-04-21 Mitsubishi Heavy Industries, Ltd. Acier coulé thermorésistant
EP1001045B1 (fr) * 1997-07-16 2004-07-07 Mitsubishi Heavy Industries, Ltd. Utilisation d'un acier coulé thérmoresistant
US7445069B2 (en) 2004-09-15 2008-11-04 Yamaha Hatsudoki Kabushiki Kaisha Vehicle control unit and vehicle
EP2157202A1 (fr) * 2007-06-04 2010-02-24 Sumitomo Metal Industries, Ltd. Acier ferrite résistant à la chaleur
EP2157202A4 (fr) * 2007-06-04 2011-09-14 Sumitomo Metal Ind Acier ferrite résistant à la chaleur

Also Published As

Publication number Publication date
JPH10251811A (ja) 1998-09-22
CZ284998A3 (cs) 1999-11-17
WO1998030727A1 (fr) 1998-07-16
EP0896071A4 (fr) 2001-06-20
JP3245097B2 (ja) 2002-01-07

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