WO2013000836A1 - Fonte à graphite sphéroïdal, en particulier pour applications à haute température - Google Patents

Fonte à graphite sphéroïdal, en particulier pour applications à haute température Download PDF

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Publication number
WO2013000836A1
WO2013000836A1 PCT/EP2012/062132 EP2012062132W WO2013000836A1 WO 2013000836 A1 WO2013000836 A1 WO 2013000836A1 EP 2012062132 W EP2012062132 W EP 2012062132W WO 2013000836 A1 WO2013000836 A1 WO 2013000836A1
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WO
WIPO (PCT)
Prior art keywords
cast iron
content
iron according
temperature applications
molybdenum
Prior art date
Application number
PCT/EP2012/062132
Other languages
German (de)
English (en)
Inventor
Wolfgang Kleinkröger
Original Assignee
Siempelkamp Giesserei Gmbh
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 Siempelkamp Giesserei Gmbh filed Critical Siempelkamp Giesserei Gmbh
Publication of WO2013000836A1 publication Critical patent/WO2013000836A1/fr

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Classifications

    • 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
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys

Definitions

  • the invention relates to a cast material, namely cast iron with ferritic or largely ferritic structure and spheroidal graphite, in particular for high-temperature applications.
  • a cast material namely cast iron with ferritic or largely ferritic structure and spheroidal graphite
  • silicon-molybdenum cast iron alloys have been proposed, which are also referred to as "SiMo”.
  • SiMo silicon-molybdenum cast iron alloys
  • SiMo silicon-molybdenum cast iron alloys
  • the high temperature resistance or heat resistance is achieved by the addition of molybdenum, wherein the molybdenum content is usually between 0.3% and 2%.
  • DE 698 35 099 T2 describes a cast iron alloy with ductile iron having a carbon content of 1, 5% to 4.5%, a silicon content of 1, 5% to 4.5%, a molybdenum content of 1, 2% to 6.5% and optionally nickel and / or copper.
  • EP 1 808 504 A1 proposes to replace the molybdenum partially or completely with cobalt.
  • this document describes an alloy with 2% to 4.5% silicon, 0.5% to 5% cobalt, 2% to 4.5% carbon and molybdenum in a proportion of ⁇ 1, 5% before.
  • manganese and nickel are included.
  • niobium as an alloying element for cast iron has also already been mentioned in DE 10 2004 045 612 A1, but without the use of molybdenum. Rather, it is a cast iron alloy with a significant nickel content of up to 2.5%.
  • Turbine housing made of different casting alloys (see DE 44 25 352 C2, DE 10 2006 002 121 A1 and EP 2 022 951 A1).
  • a disadvantage of the known SiMo alloys is the fact that, in addition to the ferritic microstructure possibly occur unwanted perlite contents, so that, if necessary, a subsequent heat treatment, for. B. an annealing is required.
  • the known SiMo alloys tend to form voids.
  • the desired mechanical properties can be undershot by a massive carbide formation. It has therefore taken to avoid these disadvantages, various additional measures, for. B. a perlite or carbide decarburization and / or the setting of feeders.
  • Another disadvantage is that with large-scale casting, alloying with higher silicon contents (> approx. 3.2%) has hitherto been avoided because of the risk of mold-causing graphite degeneration (chunky graphite). This also reduces the achievable application temperatures.
  • the invention has for its object to provide a cast iron or a cast iron alloy, which basically has the good heat resistance of a silicon-molybdenum alloy, but without being affected by the described disadvantages of this alloy.
  • the invention teaches a ductile iron, especially for high temperature applications, consisting of (in weight percent):
  • the carbon equivalent CE C + 1/3 Si is preferably 4.1% to 4.5%, e.g. B. about 4.3%.
  • the carbon equivalent, which represents the mixing proportions of C and Si, is therefore preferably very close to the eutectic.
  • the invention is based on the recognition that the properties of SiMo materials can be significantly improved and in particular avoid the known disadvantages, if the alloying element molybdenum is partially replaced by the alloying element niobium.
  • the material according to the invention is first of all characterized by a very high temperature resistance. The observed in conventional SiMo materials
  • the proportion of niobium also means that the material according to the invention can not only be used excellently in high-temperature applications, but moreover can also be readily welded.
  • it has been proposed in the prior art to completely replace a high molybdenum content by niobium in the context of the invention, however, it is particularly important to replace only a portion of the molybdenum by niobium, so that the excellent properties of the invention Material in particular by the combination of molybdenum on the one hand and niobium on the other hand at the same time result in relatively high silicon content.
  • the proportion of Mo and Nb a total of 0.4% to 1, 2%, z. B. 0.5% to 1, 0%. It may be useful if Mo and Nb in a ratio of 1: 0.5 to 1: 2, z. B. 1: 1 to 1: 1, 5 are included.
  • the Mo content is preferably 0.3% to 0.5%, e.g. B. about 0.4%.
  • the Nb content is preferably 0.2% to 0.4%, e.g. From 0.25% to 0.35%, preferably about 0.3%.
  • the C content is according to another proposal of the invention preferably 2.5% to 3.5%, more preferably 3.0% to 3.5%, z. B. about 3.2%.
  • the Si content is preferably 3.2% to 3.7%, e.g. B. about 3.5%.
  • Mn, Mg, P and S are included.
  • the Mn content is preferably 0.05% to 0.5%, more preferably 0.05% to 0.2%, e.g. 0.1% to 0.15%.
  • the Mg content is preferably 0.01% to 0.1%, more preferably 0.02% to 0.06%, e.g. B. about 0.04%.
  • Mg is thereby added to the extent that form spheres.
  • Mg contributes to the desulfurization, d. H. the sulfur content depends on the Mg content.
  • the P content is preferably 0.005% to 0.04%, e.g. From 0.01% to 0.03%, e.g. B. about 0.02%.
  • the S content is preferably 0.0015% to 0.01%, e.g. From 0.003% to 0.008%, e.g. B. about 0.006%.
  • the material according to the invention is particularly preferably suitable for producing thick-walled large castings.
  • the large castings can thus be produced large castings with a maximum wall thickness of more than 100 mm, preferably more than 200 mm, possibly even more than 300 mm, the large castings have a particularly high heat resistance.
  • Large castings have many different wall thicknesses, which can vary greatly. Decisive is the occurring maximum wall thickness, as this must also be free of errors. It can be, for example, hot parts of steam turbines and gas turbines, especially heavy, thick-walled castings produce, which at temperatures of about 300 ° C, preferably over 400 ° C and usually up to about 550 ° C continuously, possibly briefly claimed even higher become.
  • the manufacture of the cast iron according to the invention or of a cast part from this cast iron resembles on the whole the production of a commercially available cast iron with spheroidal graphite.
  • the melting can take place in any suitable furnace, for example an electric induction furnace.
  • the alloy combination according to the invention of molybdenum on the one hand and niobium on the other hand is set in the furnace in order to guarantee a good dissolution and distribution of the elements.
  • treatment with magnesium-containing spheroidizing agent takes place in a treatment vessel.
  • a nodularity modifier such as Spherix, can also be used in addition to a FeSi seed dressing. This may also be added in the pouring basin.
  • the pouring temperature should not exceed 1400 ° C to ensure the self-feeding effect.
  • a typical analysis of the material according to the invention for the production of a large cast part with a maximum wall thickness of 300 mm can be as follows (in percent by weight):

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

L'invention concerne de la fonte à graphite sphéroïdal, en particulier pour des applications à haute température, constituée (en pourcentage en poids) de: C 2% à 4,5%, Si 3 % à 4 %, Mo 0,2% à 0,6%, Nb 0,2% à 0,5%, Mn jusqu'à 0,5%, Mg jusqu'à 0,1 %, P jusqu'à 0,04 %, S jusqu'à 0,015%, le reste étant Fe et des impuretés habituelles.
PCT/EP2012/062132 2011-06-29 2012-06-22 Fonte à graphite sphéroïdal, en particulier pour applications à haute température WO2013000836A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110051446 DE102011051446A1 (de) 2011-06-29 2011-06-29 Gusseisen mit Kugelgraphit, insbesondere für Hochtemperaturanwendungen
DE102011051446.5 2011-06-29

Publications (1)

Publication Number Publication Date
WO2013000836A1 true WO2013000836A1 (fr) 2013-01-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/062132 WO2013000836A1 (fr) 2011-06-29 2012-06-22 Fonte à graphite sphéroïdal, en particulier pour applications à haute température

Country Status (2)

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DE (1) DE102011051446A1 (fr)
WO (1) WO2013000836A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016107944A1 (de) * 2016-04-28 2017-11-02 Duktus (Production) Gmbh Verfahren zur Herstellung eines Bauteils aus duktilem Gusseisen und Bauteil aus duktilem Gusseisen
DE102021000922A1 (de) 2021-02-22 2022-08-25 Siempelkamp Maschinen- Und Anlagenbau Gmbh Gusseisenwerkstoff, Verwendung elnes Gusseisenwerkstoffs und Verfahren zur Herstellung und/oder Auskleidung elnes Formwerkzeugs

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147007A (en) * 1983-09-27 1985-05-01 Ishikawajima Harima Heavy Ind Spheroidal graphite ferrite cast iron
DE4425352C2 (de) 1994-07-18 2001-10-11 Abb Patent Gmbh Dampfturbine mit einem im Gußverfahren hergestellten Turbinengehäuse
DE69821493T2 (de) 1997-07-16 2004-12-23 Mitsubishi Heavy Industries, Ltd. Verwendung eines hitzebeständigen Gussstahles für Bauteile von Turbinengehäuse n
DE102004045612A1 (de) 2004-09-17 2006-03-23 Siempelkamp Giesserei Gmbh Gusswerkstoff, insbesondere Gusseisen
DE102006002121A1 (de) 2005-02-23 2006-08-31 Alstom Technology Ltd. Trennflanschverschraubung für Turbinengehäuse mit eingegossenem Schaufelträger
DE69835099T2 (de) 1997-10-14 2007-02-01 Molycarbide International Ltd. Kugelgraphitgusseisenlegierung mit molybdän und daraus hergestellter rotor für scheibenbremse
EP1808504A1 (fr) 2006-01-16 2007-07-18 Siemens Aktiengesellschaft Fonte de fer avec cobalt et son utilisation dans une turbine à vapeur
EP2022951A1 (fr) 2007-08-08 2009-02-11 Siemens Aktiengesellschaft Procédé destiné à la fabrication d'un boîtier de turbine et boîtier de turbine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147007A (en) * 1983-09-27 1985-05-01 Ishikawajima Harima Heavy Ind Spheroidal graphite ferrite cast iron
DE4425352C2 (de) 1994-07-18 2001-10-11 Abb Patent Gmbh Dampfturbine mit einem im Gußverfahren hergestellten Turbinengehäuse
DE69821493T2 (de) 1997-07-16 2004-12-23 Mitsubishi Heavy Industries, Ltd. Verwendung eines hitzebeständigen Gussstahles für Bauteile von Turbinengehäuse n
DE69835099T2 (de) 1997-10-14 2007-02-01 Molycarbide International Ltd. Kugelgraphitgusseisenlegierung mit molybdän und daraus hergestellter rotor für scheibenbremse
DE102004045612A1 (de) 2004-09-17 2006-03-23 Siempelkamp Giesserei Gmbh Gusswerkstoff, insbesondere Gusseisen
DE102006002121A1 (de) 2005-02-23 2006-08-31 Alstom Technology Ltd. Trennflanschverschraubung für Turbinengehäuse mit eingegossenem Schaufelträger
EP1808504A1 (fr) 2006-01-16 2007-07-18 Siemens Aktiengesellschaft Fonte de fer avec cobalt et son utilisation dans une turbine à vapeur
EP2022951A1 (fr) 2007-08-08 2009-02-11 Siemens Aktiengesellschaft Procédé destiné à la fabrication d'un boîtier de turbine et boîtier de turbine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
WOLFENSBERGER: "Das komplette Werkstoffprogramm auf einen Blick", 1 May 2000 (2000-05-01), XP002685197, Retrieved from the Internet <URL:http://195.216.71.41/wp_on_the_net.pdf> [retrieved on 20121010] *
ZHAI QI-JIE: "Effect of Niobium in Cast Iron and Niobium-Containing Cast Iron", MODERN CAST IRON,, vol. 3, 1 January 2001 (2001-01-01), pages 8 - 12, XP009163544, ISSN: 1003-8345 *

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