EP1974068B1 - Fonte contenant du cobalt et élément constitutif - Google Patents

Fonte contenant du cobalt et élément constitutif Download PDF

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Publication number
EP1974068B1
EP1974068B1 EP07703621.8A EP07703621A EP1974068B1 EP 1974068 B1 EP1974068 B1 EP 1974068B1 EP 07703621 A EP07703621 A EP 07703621A EP 1974068 B1 EP1974068 B1 EP 1974068B1
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EP
European Patent Office
Prior art keywords
cast iron
nodular cast
cobalt
iron according
turbine
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.)
Not-in-force
Application number
EP07703621.8A
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German (de)
English (en)
Other versions
EP1974068A1 (fr
Inventor
Stefan Janssen
Shilun Sheng
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.)
Siemens AG
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Siemens AG
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Publication date
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Priority to EP07703621.8A priority Critical patent/EP1974068B1/fr
Publication of EP1974068A1 publication Critical patent/EP1974068A1/fr
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Publication of EP1974068B1 publication Critical patent/EP1974068B1/fr
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite

Definitions

  • the invention relates to a cast iron with cobalt according to claim 1 and a component according to claim 32.
  • the known and used cast iron alloys (so-called GJS ductile iron alloys) mainly use silicon and molybdenum to increase creep resistance, scale resistance and creep rupture strength.
  • GJS ductile iron alloys mainly use silicon and molybdenum to increase creep resistance, scale resistance and creep rupture strength.
  • these elements lead to a significant drop in toughness over time. .
  • Molybdenum also shows a very large tendency to segregation.
  • JP 61 041 721 discloses a spheroidal iron with 0.2-1.06.
  • the object is achieved by an alloy according to claim 1 and a component according to claim 32.
  • the invention is that cobalt can partially or completely replace the molybdenum.
  • the alloy according to the invention has high elongations for the range of application in the temperature range from 450 ° C to 550 ° C and has the following composition (in wt%): silicon 2.0% - 4.5% cobalt 0.5% - 5% carbon 2.0% - 4.5%, in particular 2.5% - 4%, molybdenum ⁇ 1.5%, in particular ⁇ 1.0%, manganese ⁇ 0.25%, nickel ⁇ 0.5%, in particular ⁇ 0.3%, Rest iron.
  • the proportion of silicon, cobalt and molybdenum is ⁇ 7.5 wt%.
  • the proportion of cobalt in the alloy is between 0.5wt% to 1.5wt% cobalt.
  • the cobalt content is 0.5wt%, 1.0wt% cobalt, 1.5wt% cobalt and 2.0wt% cobalt.
  • the alloy can have further elements.
  • the alloy consists of iron, silicon, cobalt and carbon.
  • the alloy consists of iron, silicon, cobalt, carbon and manganese. Further advantages result from an alloy consisting of iron, silicon, cobalt, carbon and optional admixtures of molybdenum, manganese and / or nickel.
  • undesirable impurities in the alloy are maximum phosphorus 0,007wt% sulfur 0,008wt% magnesium 0,049wt% available.
  • FIG. 1 shows a nearly optimal ferritic microstructure (etched) with spheroidal graphite from an alloy with about 2wt% cobalt: carbon 3,67wt% silicon 2,41wt% manganese 0,029wt% cobalt 1,94wt% iron Rest.
  • FIG. 2 shows the influence of cobalt on the mechanical properties of the alloy, which are shown in the following table (in wt%).
  • the elongation at break R p02 increases from 271N / mm 2 to 284N / mm 2
  • the tensile strength Rm increases from 403N / mm 2 to 412N / mm 2 .
  • the elongation at break A5 increases from 15.5% to 21.9%.
  • the fracture rate Z increases from 13.8% to 29.5%.
  • FIG. 3 a steam turbine 300, 303 is shown with a turbine shaft 309 extending along a rotation axis 306.
  • the steam turbine has a high-pressure turbine section 300 and a medium-pressure turbine section 303, each having an inner housing 312 and an outer housing 315 enclosing this.
  • the high-pressure turbine part 300 is designed, for example, in Topfbauart.
  • the medium-pressure turbine part 303 is designed, for example, double-flow. It is also possible for the medium-pressure turbine section 303 to be single-flow.
  • a bearing 318 is arranged between the high-pressure turbine section 300 and the medium-pressure turbine section 303, the turbine shaft 309 having a bearing region 321 in the bearing 318.
  • the turbine shaft 309 is supported on another bearing 324 adjacent to the high pressure turbine sub 300.
  • the high-pressure turbine section 300 has a shaft seal 345.
  • the turbine shaft 309 is sealed from the outer housing 315 of the medium-pressure turbine section 303 by two further shaft seals 345.
  • the turbine shaft 309 in the high-pressure turbine section 300 has the high-pressure impeller blade 357. This high-pressure blading 357, together with the associated blades, not shown, represents a first blading region 360.
  • the medium-pressure turbine part 303 has a central steam inflow region 333.
  • the turbine shaft 309 has a radially symmetric shaft shield 363, a cover plate, on the one hand for dividing the steam flow into the two flows of the medium-pressure turbine section 303 and for preventing direct contact of the hot steam with the turbine shaft 309.
  • the turbine shaft 309 has a second blading area 366 with the medium-pressure rotor blades 354 in the medium-pressure turbine section 303. The hot steam flowing through the second blading area 366 flows out of the medium-pressure turbine section 303 from a discharge connection 369 to a downstream low-pressure turbine, not shown.
  • the turbine shaft 309 is composed for example of two partial turbine shafts 309a and 309b, which are fixedly connected to one another in the region of the bearing 318.
  • Each sub-turbine shaft 309a, 309b has a cooling line 372 designed as a central bore 372a along the axis of rotation 306.
  • the cooling line 372 is connected to the vapor exit region 351 via an inflow line 375 having a radial bore 375a.
  • the coolant line 372 is connected to a cavity not shown below the shaft shield.
  • the feed lines 375 are configured as a radial bore 375a, allowing "cold" steam from the high pressure turbine section 300 to flow into the central bore 372a.
  • the vapor passes through the storage area 321 into the medium-pressure turbine section 303 and there to the mantle surface 330 of the turbine shaft 309 in the steam inflow area 333.
  • the steam flowing through the cooling line has a significantly lower temperature as the reheated steam flowing into the Dampfeinström Siemens 333, so that an effective cooling of the first blade rows 342 of the medium-pressure turbine section 303 and the mantle surface 330 is ensured in the region of these blade rows 342.
  • FIG. 4 shows by way of example a gas turbine 100 in a longitudinal partial section.
  • the gas turbine 100 has inside a rotatably mounted about a rotation axis 102 rotor 103 with a shaft 101, which is also referred to as a turbine runner.
  • a compressor 105 for example, a toroidal combustion chamber 110, in particular annular combustion chamber, with a plurality of coaxially arranged burners 107, a turbine 108 and the exhaust housing 109th
  • the annular combustion chamber 110 communicates with an annular annular hot gas channel 111, for example.
  • annular annular hot gas channel 111 for example.
  • turbine stages 112 connected in series form the turbine 108.
  • Each turbine stage 112 is formed, for example, from two blade rings. As seen in the direction of flow of a working medium 113, in the hot gas channel 111 of a row of guide vanes 115, a series 125 formed of rotor blades 120 follows.
  • the guide vanes 130 are fastened to an inner housing 138 of a stator 143, whereas the moving blades 120 of a row 125 are attached to the rotor 103 by means of a turbine disk 133, for example. Coupled to the rotor 103 is a generator or work machine (not shown).
  • air 105 is sucked in and compressed by the compressor 105 through the intake housing 104.
  • the compressed air provided at the turbine-side end of the compressor 105 is supplied to the burners 107 where it is mixed with a fuel.
  • the mixture is then burned to form the working fluid 113 in the combustion chamber 110.
  • the working medium 113 flows along the hot gas channel 111 past the guide vanes 130 and the rotor blades 120.
  • the working medium 113 expands in a pulse-transmitting manner, so that the rotor blades 120 drive the rotor 103 and drive the machine coupled to it.
  • the components exposed to the hot working medium 113 are subject to thermal loads during operation of the gas turbine 100.
  • the guide vanes 130 and rotor blades 120 of the first turbine stage 112, viewed in the flow direction of the working medium 113, are subjected to the greatest thermal stress in addition to the heat shield elements lining the annular combustion chamber 110. To withstand the prevailing temperatures, they can be cooled by means of a coolant.
  • substrates of the components can have a directional structure, ie they are monocrystalline (SX structure) or have only longitudinal grains (DS structure).
  • SX structure monocrystalline
  • DS structure longitudinal grains
  • iron-, nickel- or cobalt-based superalloys are used as the material for the components.
  • superalloys are for example from EP 1 204 776 B1 .
  • EP 1 306 454 are used as the material for the components.
  • the blades 120, 130 may be anti-corrosion coatings (MCrAlX; M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni), X is an active element and is yttrium (Y) and / or silicon , Scandium (Sc) and / or at least one element of the rare earth or hafnium).
  • M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni)
  • X is an active element and is yttrium (Y) and / or silicon , Scandium (Sc) and / or at least one element of the rare earth or hafnium).
  • Such alloys are known from the EP 0 486 489 B1 .
  • EP 0 412 397 B1 or EP 1 306 454 A1 which should be part of this disclosure in terms of chemical composition.
  • MCrAlX may still be present a thermal barrier coating, and consists for example of ZrO 2 , Y 2 O 3 -ZrO 2 , that is, it is not, partially or completely stabilized by yttria and / or calcium oxide and / or magnesium oxide.
  • Electron beam evaporation produces stalk-shaped grains in the thermal barrier coating.
  • the vane 130 has a guide vane foot (not shown here) facing the inner housing 138 of the turbine 108 and a vane head opposite the vane foot.
  • the vane head faces the rotor 103 and fixed to a mounting ring 140 of the stator 143.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (35)

  1. Fonte à graphite sphéroïdale contenant (en % en poids) : silicium 2,0 % - 4,5 % cobalt 0,5 % - 5 % carbone 2,0 % - 4,5 %, notamment 2,5 % - 4 % molybdène ≤ 1,5 %, notamment ≤ 1,0 % manganèse ≤ 0,25 % nickel ≤ 0,5 %, notamment ≤ 0,3 %
    le reste étant du fer.
  2. Fonte à graphite sphéroïdale suivant la revendication 1,
    dans laquelle la proportion de silicium, de cobalt et de molybdène est plus petite que 7,5 % en poids.
  3. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant de 0,5 % en poids à 2,0 % en poids de cobalt.
  4. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant de 0,5 % en poids à 1,5 % en poids de cobalt.
  5. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant de 0,5 % en poids à 1,0 % en poids de cobalt.
  6. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant de 1,0 % en poids à 2,0 % en poids de cobalt.
  7. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant de 1,0 % en poids à 1,5 % en poids de cobalt.
  8. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant de 1,5 % en poids à 2,0 % en poids de cobalt.
  9. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant 0, 5 % en poids de cobalt.
  10. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant 1 % en poids de cobalt.
  11. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant 1,5 % en poids de cobalt.
  12. Fonte à graphite sphéroïdale suivant l'une des revendications 1 ou 2,
    contenant 2,0 % en poids de cobalt.
  13. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient du molybdène.
  14. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes 1 à 12,
    qui ne contient pas de molybdène.
  15. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient du manganèse.
  16. Fonte à graphite sphéroïdale suivant la revendication 15,
    qui a une teneur en manganèse ≤ 0,07 % en poids.
  17. Fonte à graphite sphéroïdale suivant la revendication 15,
    qui a une teneur en manganèse ≤ 0,03 % en poids.
  18. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes 1 à 14,
    qui ne contient pas de manganèse.
  19. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient de nickel.
  20. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes 1 à 18,
    qui ne contient pas de nickel.
  21. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient de 2,0 % en poids à 3,0 % en poids de silicium.
  22. Fonte à graphite sphéroïdale suivant la revendication 21, qui contient 2,5 % en poids de silicium.
  23. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient de 3,5 % en poids à 4,0 % en poids de carbone, notamment 3,7 % en poids de carbone.
  24. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient au maximum 0,007 % en poids de phosphore.
  25. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient au maximum 0,0008 % en poids de souffre ( S ).
  26. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui contient au maximum 0,05 % en poids de magnésium.
  27. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui ne contient pas de chrome ( Cr ).
  28. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    qui ne contient pas de magnésium ( Mg ).
  29. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes,
    constituée de
    fer, silicium, cobalt et carbone.
  30. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes 1 à 28,
    constituée de
    fer, silicium, cobalt, carbone et manganèse.
  31. Fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes 1 à 28,
    constituée de
    fer, silicium, cobalt, carbone et éventuellement manganèse, molybdène et/ou nickel.
  32. Elément constitutif,
    en fonte à graphite sphéroïdale suivant l'une ou plusieurs des revendications précédentes 1 à 31.
  33. Elément constitutif suivant la revendication 32,
    qui est une partie de carter.
  34. Elément constitutif suivant l'une des revendications 32 ou 33,
    qui est un élément constitutif d'une turbine ( 300, 303 ) à vapeur ou d'une turbine ( 100 ) à gaz.
  35. Elément constitutif suivant l'une des revendications 32, 33 ou 34,
    qui a un substrat à base de fer ou d'acier.
EP07703621.8A 2006-01-16 2007-01-03 Fonte contenant du cobalt et élément constitutif Not-in-force EP1974068B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07703621.8A EP1974068B1 (fr) 2006-01-16 2007-01-03 Fonte contenant du cobalt et élément constitutif

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06000851A EP1808504A1 (fr) 2006-01-16 2006-01-16 Fonte de fer avec cobalt et son utilisation dans une turbine à vapeur
PCT/EP2007/050057 WO2007082788A1 (fr) 2006-01-16 2007-01-03 Fonte contenant du cobalt et élément constitutif
EP07703621.8A EP1974068B1 (fr) 2006-01-16 2007-01-03 Fonte contenant du cobalt et élément constitutif

Publications (2)

Publication Number Publication Date
EP1974068A1 EP1974068A1 (fr) 2008-10-01
EP1974068B1 true EP1974068B1 (fr) 2013-07-24

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP06000851A Withdrawn EP1808504A1 (fr) 2006-01-16 2006-01-16 Fonte de fer avec cobalt et son utilisation dans une turbine à vapeur
EP07703621.8A Not-in-force EP1974068B1 (fr) 2006-01-16 2007-01-03 Fonte contenant du cobalt et élément constitutif

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06000851A Withdrawn EP1808504A1 (fr) 2006-01-16 2006-01-16 Fonte de fer avec cobalt et son utilisation dans une turbine à vapeur

Country Status (4)

Country Link
US (1) US20100178192A1 (fr)
EP (2) EP1808504A1 (fr)
CN (1) CN101400812A (fr)
WO (1) WO2007082788A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008051042A1 (de) * 2008-10-09 2010-04-15 Siemens Aktiengesellschaft Gusseisen mit Kobalt und Bauteil
US20100322813A1 (en) * 2009-06-23 2010-12-23 General Electric Company SiMo DUCTILE IRON CASTINGS IN GAS TURBINE APPLICATIONS
EP2511394B1 (fr) * 2011-04-15 2015-05-27 Siemens Aktiengesellschaft Fonte dotée de niobium et composant
DE102011051446A1 (de) 2011-06-29 2013-01-03 Siempelkamp Giesserei Gmbh Gusseisen mit Kugelgraphit, insbesondere für Hochtemperaturanwendungen
CN103146990B (zh) * 2013-03-29 2016-07-06 天津新伟祥工业有限公司 汽车涡轮壳体用高硅钼铬球铁材质及其制备方法
CN105714181A (zh) * 2016-02-26 2016-06-29 铜陵安东铸钢有限责任公司 一种含钴球墨铸铁及其制备方法
WO2018093894A1 (fr) * 2016-11-18 2018-05-24 Michigan Technological University Alliages de fer ductile et matériaux comprenant une couche mince d'un alliage de fer ductile

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740212A (en) * 1971-03-31 1973-06-19 Int Nickel Co Oxidation resistant austenitic ductile nickel chromium iron
JPH0613738B2 (ja) * 1984-07-31 1994-02-23 株式会社クボタ 延性に富んだ高強度ダクタイル鋳鉄管の製造方法
FR2681878B1 (fr) * 1991-09-26 1993-12-31 Centre Tech Ind Fonderie Fonte a graphite spherouidal resistant a la chaleur.

Also Published As

Publication number Publication date
WO2007082788A1 (fr) 2007-07-26
US20100178192A1 (en) 2010-07-15
EP1974068A1 (fr) 2008-10-01
EP1808504A1 (fr) 2007-07-18
CN101400812A (zh) 2009-04-01

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