US20140030133A1 - Cast iron containing niobium and component - Google Patents

Cast iron containing niobium and component Download PDF

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Publication number
US20140030133A1
US20140030133A1 US14/110,498 US201214110498A US2014030133A1 US 20140030133 A1 US20140030133 A1 US 20140030133A1 US 201214110498 A US201214110498 A US 201214110498A US 2014030133 A1 US2014030133 A1 US 2014030133A1
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US
United States
Prior art keywords
alloy
weight
cobalt
turbine
niobium
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.)
Abandoned
Application number
US14/110,498
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English (en)
Inventor
Lutz Dekker
Guido Günther
Stefan Janssen
Susanne Lange
Alfred Scholz
Shilun Sheng
Babette Tonn
Mark Vierbaum
Stefan Wanjura
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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Individual
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.)
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Publication date
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Assigned to FRIEDRICH WILHELMS-HUETTE EISENGUSS GMBH reassignment FRIEDRICH WILHELMS-HUETTE EISENGUSS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GUENTHER, GUIDO, Vierbaum, Mark
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FRIEDRICH WILHELMS-HUETTE EISENGUSS GMBH
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TECHNISCHE UNIVERSITAET DARMSTADT
Assigned to TECHNISCHE UNIVERSITAET CLAUSTHAL reassignment TECHNISCHE UNIVERSITAET CLAUSTHAL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TONN, BABETTE, Dekker, Lutz
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TECHNISCHE UNIVERSITAET CLAUSTHAL
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JANSSEN, STEFAN, Wanjura, Stefan, SHENG, SHILUN
Publication of US20140030133A1 publication Critical patent/US20140030133A1/en
Abandoned legal-status Critical Current

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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
    • C22C37/06—Cast-iron alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • 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
    • 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
    • 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
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • 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
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion

Definitions

  • the invention relates to a cast iron containing niobium as claimed in the claims and to a component as claimed in the claims.
  • GJS alloys nodular cast iron
  • Molybdenum furthermore exhibits a very high susceptibility to segregation.
  • the invention consists in the fact that cobalt and/or niobium can partially replace molybdenum.
  • the working limitations presented by the previous GJS alloy can therefore be overcome.
  • the iron-based alloy according to the invention has high elongations for the application field in the temperature range of 450° C.-550° C., and has the following composition (in % by weight):
  • the proportion of silicon, cobalt, niobium and molybdenum is ⁇ 7.5% by weight, in particular ⁇ 6.5% by weight.
  • Niobium improves the endurance strength with a constantly high LCF strength and good toughness.
  • niobium brings about a higher high-temperature strength, as a result of which the working limitations are shifted to high temperatures.
  • Cobalt brings about a solid solution solidification, which has a positive effect on the properties of the alloy at high temperatures and given low stresses.
  • molybdenum added to the alloy (preferably 0.4%-1.0%) has a positive influence on the high-temperature strength (Rp0.2 and Rm in the elevated temperature range) and the endurance behavior (creep strength).
  • the proportion of cobalt in the alloy lies between 0.5% by weight and 1.5% by weight.
  • Magnesium obtains the nodular formation of the graphite and magnesium is preferably present in an amount of at least 0.03% by weight, at most 0.07% by weight.
  • chromium (Cr) is preferably present in an amount of at least 0.01% by weight, but at most 0.05% by weight, and this increases the oxidation resistance.
  • the alloy may comprise further elements.
  • the alloy optionally contains small minimum admixtures of
  • FIG. 1 shows a steam turbine
  • FIG. 2 shows a gas turbine
  • the component with the alloy has an optimal ferritic microstructure with nodular graphite.
  • the table shows exemplary alloys according to the invention which have improved mechanical properties.
  • the alloy preferably contains no vanadium (V) and/or titanium (Ti) and/or tantalum (Ta) and/or copper (Cu).
  • the ratio of C and Si should give an almost-eutectic composition, i.e. should correspond to a carbon equivalent CE of between 4.1% and 4.4%,
  • FIG. 1 shows a steam turbine 300 , 303 having a turbine shaft 309 extending along an axis of rotation 306 .
  • the steam turbine comprises a high-pressure turbine part 300 and a medium-pressure turbine part 303 , each with an inner housing 312 and an outer housing 315 enclosing the latter.
  • the high-pressure turbine part 300 is, for example, configured in pot design.
  • the medium-pressure turbine part 303 is, for example, configured to be twin-streamed. It is likewise possible for the medium-pressure turbine part 303 to be configured to be single-streamed.
  • a bearing 318 is arranged along the axis of rotation 306 between the high-pressure turbine part 300 and the medium-pressure turbine part 303 , the turbine shaft 309 comprising a bearing region 321 in the bearing 318 .
  • the turbine shaft 309 is mounted on a further bearing 324 beside the high-pressure turbine part 300 .
  • the high-pressure turbine part 300 comprises a shaft seal 345 .
  • the turbine shaft 309 is sealed relative to the outer housing 315 of the medium-pressure turbine part 303 by two further shaft seals 345 .
  • the turbine shaft 309 in the high-pressure turbine part 300 comprises the high-pressure rotor blading 357 . With the associated rotor blades (not shown in more detail), this high-pressure rotor blading 357 constitutes a first blading region 360 .
  • the medium-pressure turbine part 303 comprises a central steam intake region 333 .
  • the turbine shaft 309 comprises a radially symmetric shaft shield 363 , a cover plate, on the one hand to divide the steam flow into the two streams of the medium-pressure turbine part 303 and also to prevent direct contact of the hot steam with the turbine shaft 309 .
  • the turbine shaft 309 comprises a second blading region 366 with the medium-pressure rotor blades 354 . The hot steam flowing through the second blading region 366 flows from the medium-pressure turbine part 303 out of a discharge port 369 to a low-pressure turbine part (not shown) connected downstream in terms of flow technology.
  • the turbine shaft 309 is composed for example of two turbine shaft parts 309 a and 309 b, which are connected firmly to one another in the region of the bearing 318 .
  • Each turbine shaft part 309 a, 309 b comprises a cooling line 372 formed as a central bore 372 a along the axis of rotation 306 .
  • the cooling line 372 is connected to the steam outlet region 351 via a feed line 375 comprising a radial bore 375 a.
  • the coolant line 372 is connected to a cavity (not shown in more detail) below the shaft shield.
  • the feed lines 375 are configured as a radial bore 375 a, so that “cold” steam from the high-pressure turbine part 300 can flow into the central bore 372 a .
  • the discharge line 372 also formed in particular as a radially directed bore 375 a, the steam passes through the bearing region 321 into the medium-pressure turbine part 303 and there onto the lateral surface 330 of the turbine shaft 309 in the steam intake region 333 .
  • the steam flowing through the cooling line is at a much lower temperature than the temporarily superheated steam flowing into the steam intake region 333 , so as to ensure effective cooling of the first rotor blade row 342 of the medium-pressure turbine part 303 and the lateral surface 330 in the region of this rotor blade row 342 .
  • FIG. 2 shows, by way of example, a partial longitudinal section through a gas turbine 100 .
  • the gas turbine 100 has a rotor 103 with a shaft 101 which is mounted such that it can rotate about an axis of rotation 102 and is also referred to as the turbine rotor.
  • the annular combustion chamber 110 is in communication with a, for example, annular hot-gas passage 111 , where, by way of example, four successive turbine stages 112 form the turbine 108 .
  • Each turbine stage 112 is formed, for example, from two blade or vane rings. As seen in the direction of flow of a working medium 113 , in the hot-gas passage 111 a row of guide vanes 115 is followed by a row 125 formed from rotor blades 120 .
  • the guide vanes 130 are secured to an inner housing 138 of a stator 143 , whereas the rotor blades 120 of a row 125 are fitted to the rotor 103 for example by means of a turbine disk 133 .
  • a generator or a working machine (not shown) is coupled to the rotor 103 .
  • the compressor 105 While the gas turbine 100 is operating, the compressor 105 sucks in air 135 through the intake housing 104 and compresses it. The compressed air provided at the turbine-side end of the compressor 105 is passed to the burners 107 , where it is mixed with a fuel. The mix is then burnt in the combustion chamber 110 , forming the working medium 113 . From there, the working medium 113 flows along the hot-gas passage 111 past the guide vanes 130 and the rotor blades 120 . The working medium 113 is expanded at the rotor blades 120 , transferring its momentum, so that the rotor blades 120 drive the rotor 103 and the latter in turn drives the generator coupled to it.
  • Substrates of the components may likewise have a directional structure, i.e. they are in single-crystal form (SX structure) or have only longitudinally oriented grains (DS structure).
  • SX structure single-crystal form
  • DS structure longitudinally oriented grains
  • iron-based, nickel-based or cobalt-based superalloys are used as material for the components, in particular for the turbine blade or vane 120 , 130 and components of the combustion chamber 110 .
  • the blades or vanes 120 , 130 may likewise have coatings protecting against corrosion (MCrAlX; M is at least one element selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni), X is an active element and stands for yttrium (Y) and/or silicon, scandium (Sc) and/or at least one rare earth element, or hafnium). Alloys of this type are known from EP 0 486 489 B 1, EP 0 786 017 B1, EP 0 412 397 B1 or EP 1 306 454 A1.
  • thermal barrier coating to be present on the MCrAlX, consisting for example of ZrO 2 , Y 2 O 3 —ZrO 2 , i.e. it is unstabilized, partially stabilized or fully stabilized by yttrium oxide and/or calcium oxide and/or magnesium oxide.
  • Columnar grains are produced in the thermal barrier coating by suitable coating processes, such as for example electron beam physical vapor deposition (EB-PVD).
  • EB-PVD electron beam physical vapor deposition
  • the guide vane 130 has a guide vane root (not shown here), which faces the inner housing 138 of the turbine 108 , and a guide vane head which is at the opposite end from the guide vane root.
  • the guide vane head faces the rotor 103 and is fixed to a securing ring 140 of the stator 143 .
US14/110,498 2011-04-15 2012-03-21 Cast iron containing niobium and component Abandoned US20140030133A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11162635.4 2011-04-15
EP11162635.4A EP2511394B1 (de) 2011-04-15 2011-04-15 Gusseisen mit Niob und Bauteil
PCT/EP2012/054941 WO2012139864A1 (de) 2011-04-15 2012-03-21 Gusseisen mit niob und bauteil

Publications (1)

Publication Number Publication Date
US20140030133A1 true US20140030133A1 (en) 2014-01-30

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Application Number Title Priority Date Filing Date
US14/110,498 Abandoned US20140030133A1 (en) 2011-04-15 2012-03-21 Cast iron containing niobium and component

Country Status (5)

Country Link
US (1) US20140030133A1 (de)
EP (1) EP2511394B1 (de)
CN (1) CN103517997A (de)
RU (1) RU2562175C2 (de)
WO (1) WO2012139864A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140093416A1 (en) * 2012-10-01 2014-04-03 Lutz Dekker Cast iron containing niobium and component
US20180192418A1 (en) * 2014-09-26 2018-07-05 Qualcomm Incorporated Ultra-low latency lte control data communication
CN112626409A (zh) * 2020-12-15 2021-04-09 江苏泽茗精密机械制造股份有限公司 用于涡轮壳的耐高温蠕墨铸铁的制备工艺
US11088798B2 (en) 2014-09-26 2021-08-10 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission
US11985084B2 (en) 2021-08-04 2024-05-14 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission

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JP6090905B2 (ja) * 2012-11-26 2017-03-08 株式会社日本製鋼所 高温延性と高温クリープ破断寿命に優れた球状黒鉛鋳鉄およびその製造方法
SE538682C2 (en) * 2014-10-27 2016-10-18 Scania Cv Ab A cast iron article with a corrosion resistant layer and a method of producing said article
CN104342594A (zh) * 2014-12-02 2015-02-11 江苏金洋机械有限公司 一种用于制备高铁扣件用铁垫板的合金
RU2629406C1 (ru) * 2016-12-13 2017-08-29 Юлия Алексеевна Щепочкина Чугун
CN108149142A (zh) * 2018-02-01 2018-06-12 广西超盛网络科技有限责任公司 一种耐腐蚀钢材及其制备方法

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US3411957A (en) * 1965-06-01 1968-11-19 Nisso Seiko Kabushiki Kaisha Method of manufacturing a cast iron roll
EP0464780A1 (de) * 1990-07-04 1992-01-08 Kubota Corporation Verschleissfester Gusseisenwerkstoff für eine Arbeitswalze und Verbundwalze
DE10309386A1 (de) * 2003-03-04 2004-09-23 Federal-Mogul Burscheid Gmbh Gusseisenwerkstoff mit gezieltem Restkarbidanteil und Verfahren zur Herstellung desselben
WO2006018053A1 (de) * 2004-08-18 2006-02-23 Federal-Mogul Burscheid Gmbh Gusseisenwerkstoff für kolbenringe
US20080274005A1 (en) * 2005-05-05 2008-11-06 Wescast Industries, Inc. Cast Iron With Improved High Temperature Properties
US20090191085A1 (en) * 2008-01-29 2009-07-30 Cesar Augusto Rezende Braga Ferritic Ductile Cast Iron Alloys
DE102008051042A1 (de) * 2008-10-09 2010-04-15 Siemens Aktiengesellschaft Gusseisen mit Kobalt und Bauteil
US20100178192A1 (en) * 2006-01-16 2010-07-15 Siemens Aktiengesellschaft Cast Iron Comprising Cobalt and Component

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411957A (en) * 1965-06-01 1968-11-19 Nisso Seiko Kabushiki Kaisha Method of manufacturing a cast iron roll
EP0464780A1 (de) * 1990-07-04 1992-01-08 Kubota Corporation Verschleissfester Gusseisenwerkstoff für eine Arbeitswalze und Verbundwalze
DE10309386A1 (de) * 2003-03-04 2004-09-23 Federal-Mogul Burscheid Gmbh Gusseisenwerkstoff mit gezieltem Restkarbidanteil und Verfahren zur Herstellung desselben
WO2006018053A1 (de) * 2004-08-18 2006-02-23 Federal-Mogul Burscheid Gmbh Gusseisenwerkstoff für kolbenringe
US20080274005A1 (en) * 2005-05-05 2008-11-06 Wescast Industries, Inc. Cast Iron With Improved High Temperature Properties
US20100178192A1 (en) * 2006-01-16 2010-07-15 Siemens Aktiengesellschaft Cast Iron Comprising Cobalt and Component
US20090191085A1 (en) * 2008-01-29 2009-07-30 Cesar Augusto Rezende Braga Ferritic Ductile Cast Iron Alloys
DE102008051042A1 (de) * 2008-10-09 2010-04-15 Siemens Aktiengesellschaft Gusseisen mit Kobalt und Bauteil
US20110194969A1 (en) * 2008-10-09 2011-08-11 Stefan Janssen Ductile Iron Having Cobalt

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140093416A1 (en) * 2012-10-01 2014-04-03 Lutz Dekker Cast iron containing niobium and component
US20180192418A1 (en) * 2014-09-26 2018-07-05 Qualcomm Incorporated Ultra-low latency lte control data communication
US11088798B2 (en) 2014-09-26 2021-08-10 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission
US11234226B2 (en) 2014-09-26 2022-01-25 Qualcomm Incorporated Ultra-low latency LTE control data communication
CN112626409A (zh) * 2020-12-15 2021-04-09 江苏泽茗精密机械制造股份有限公司 用于涡轮壳的耐高温蠕墨铸铁的制备工艺
US11985084B2 (en) 2021-08-04 2024-05-14 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission

Also Published As

Publication number Publication date
WO2012139864A1 (de) 2012-10-18
EP2511394B1 (de) 2015-05-27
EP2511394A1 (de) 2012-10-17
RU2562175C2 (ru) 2015-09-10
RU2013150798A (ru) 2015-05-20
CN103517997A (zh) 2014-01-15

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Effective date: 20130903

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION