EP0018445B2 - Verfahren zur Herstellung von Gussstücken aus Gusseisen mit Kugelgraphit - Google Patents

Verfahren zur Herstellung von Gussstücken aus Gusseisen mit Kugelgraphit Download PDF

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Publication number
EP0018445B2
EP0018445B2 EP79200725A EP79200725A EP0018445B2 EP 0018445 B2 EP0018445 B2 EP 0018445B2 EP 79200725 A EP79200725 A EP 79200725A EP 79200725 A EP79200725 A EP 79200725A EP 0018445 B2 EP0018445 B2 EP 0018445B2
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EP
European Patent Office
Prior art keywords
temperature
minutes
melt contains
casting
maintained
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.)
Expired - Lifetime
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EP79200725A
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German (de)
English (en)
French (fr)
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EP0018445A1 (de
EP0018445B1 (de
Inventor
Horst Dr. Mühlberger
Bruno Dr. Prinz
Wolf Dr. Wunder
Ulrich Dipl.-Ing. Schäfer
Josef Ing. Bognar
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Muehlberger Horst Dr
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Individual
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • 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 process for producing castings from spheroidal graphite cast iron with an austenitic-bainitic mixed structure from a melt with the usual amounts of silicon, carbon, phosphorus, sulfur and magnesium and additional amounts of manganese, molybdenum, optionally copper and optionally nickel which the casting is heated to austenitizing temperature and kept at this temperature until austenitizing and then cooled to bainitizing temperature of 350 to 400 ° C and held at this temperature for a time corresponding to the desired bainite content.
  • a spheroidal graphite cast iron with an austenitic-bainitic structure is, apart from the usual applications, also suitable as a construction material for areas in which previously only tempered steels were used, such as.
  • the castings are generally heated to an austenitizing temperature of 920 to 950 ° C. during manufacture and held at this temperature for two to five hours until the matrix has assumed an approximately uniform carbon content and any ledeburite present after the casting has dissolved. After austenitizing, the castings are then cooled so quickly that premature austenite transformation to pearlite is avoided before the isothermal bainite transformation temperature is reached. The casting is held at this temperature until the bainite reaction has ended. Thereafter, as usual, the mixture is cooled to room temperature (Foundry 65 (1978) No. 4 pages 73 to 80).
  • a method of the type mentioned at the outset is also known, in which a weakly alloyed melt is used which, in addition to the conventional amounts of carbon, silicon, phosphorus, sulfur and magnesium, 0.10 to 0.26% Molybdenum and 0.3 to 1.4% manganese.
  • the resulting casting is heated to an austenitizing temperature of 900 ° C and cooled after a holding time of two hours in a bath of 370 ° C.
  • the holding time at the bainitization temperature is 10 minutes to 4 hours.
  • an austenitic-bainitic structure can be set which has a tensile strength of 1 100 N / mm 2 , an elongation at break of 10% and a hardness of 270 to 300 HB.
  • the melt contains less than 0.3% manganese, 0.25 to 0.8% molybdenum, optionally 0.1 to 1.5% copper and optionally up to 3% nickel and that the casting is on brought an austenitizing temperature of 800 to 860 ° C., held at this temperature for 10 to 60 minutes, then cooled to the bainitizing temperature in less than 2 minutes and kept at this temperature for 5 to 60 minutes.
  • the cost of heat treatment in the process according to the invention is considerably less than in the known processes, without the good material properties of the cast iron having spheroidal graphite having an austenitic-bainitic structure being impaired thereby.
  • the proportion of silicon can be 2.0 to 3.0%, preferably 2.2 to 2.6%, the proportion of carbon 2.5 to 3.7%, preferably 3.0 to 3.2%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)
EP79200725A 1978-12-13 1979-12-05 Verfahren zur Herstellung von Gussstücken aus Gusseisen mit Kugelgraphit Expired - Lifetime EP0018445B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782853870 DE2853870A1 (de) 1978-12-13 1978-12-13 Gusseisen mit kugelgraphit mit austenitisch-bainitischem mischgefuege
DE2853870 1978-12-13

Publications (3)

Publication Number Publication Date
EP0018445A1 EP0018445A1 (de) 1980-11-12
EP0018445B1 EP0018445B1 (de) 1984-06-06
EP0018445B2 true EP0018445B2 (de) 1990-01-03

Family

ID=6057078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200725A Expired - Lifetime EP0018445B2 (de) 1978-12-13 1979-12-05 Verfahren zur Herstellung von Gussstücken aus Gusseisen mit Kugelgraphit

Country Status (4)

Country Link
EP (1) EP0018445B2 (enrdf_load_stackoverflow)
JP (1) JPS5910988B2 (enrdf_load_stackoverflow)
DE (2) DE2853870A1 (enrdf_load_stackoverflow)
ZA (1) ZA796750B (enrdf_load_stackoverflow)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH648350A5 (de) * 1981-12-03 1985-03-15 Fischer Ag Georg Verfahren zum isothermen bainitisieren von werkstuecken aus eisenwerkstoffen.
FR2522291A1 (fr) * 1982-03-01 1983-09-02 Pont A Mousson Tube centrifuge en fonte a graphite spheroidal et son procede de fabrication
US4619713A (en) * 1983-02-25 1986-10-28 Hitachi Metals, Ltd. Method of producing nodular graphite cast iron
JPS59157221A (ja) * 1983-02-25 1984-09-06 Hitachi Metals Ltd 球状黒鉛鋳鉄の製造法
JPS6024318A (ja) * 1983-02-25 1985-02-07 Hitachi Metals Ltd 球状黒鉛鋳鉄の製造法
JPS60121253A (ja) * 1983-12-05 1985-06-28 Nissan Motor Co Ltd 球状黒鉛鋳鉄
US4744211A (en) * 1984-01-06 1988-05-17 Hitachi Metals, Ltd. Detachable chain and method of producing the same
US4596606A (en) * 1984-09-04 1986-06-24 Ford Motor Company Method of making CG iron
JPS61136657A (ja) * 1984-12-05 1986-06-24 Ngk Insulators Ltd プラスチツク成形用鋳造金型
JPS61264156A (ja) * 1985-01-30 1986-11-22 Asahi Malleable Iron Co Ltd ベ−ナイト基地球状黒鉛鋳鉄およびその製法
JPS61264155A (ja) * 1985-01-30 1986-11-22 Asahi Malleable Iron Co Ltd ベ−ナイト基地球状黒鉛鋳鉄およびその製法
SE8502514L (sv) * 1985-05-22 1986-11-23 Volvo Ab Forfarande for framstellning av ett bainitherdat segjern
JPS6227547A (ja) * 1985-07-30 1987-02-05 Hitachi Metals Ltd コイルばねとその製造法
US4737199A (en) * 1985-12-23 1988-04-12 Ford Motor Company Machinable ductile or semiductile cast iron and method
JPS62214123A (ja) * 1986-03-17 1987-09-19 Kubota Ltd 高強度ダクタイル鋳鉄の製造方法
JPS63227744A (ja) * 1987-03-17 1988-09-22 Mazda Motor Corp 球状黒鉛鋳鉄鋳物およびその製造法
US4880477A (en) * 1988-06-14 1989-11-14 Textron, Inc. Process of making an austempered ductile iron article
US5028281A (en) * 1988-06-14 1991-07-02 Textron, Inc. Camshaft
DE3821169A1 (de) * 1988-06-23 1989-12-28 Wizemann Gmbh U Co J Verfahren zur herstellung verschleissfester gussteile
JPH04333369A (ja) * 1991-05-07 1992-11-20 Hitachi Zosen Corp 構造物における柱の溶接装置
ES2048656B1 (es) * 1992-07-09 1994-10-16 Frenos Electricos Unidos Sa Rotores inducidos de ralentizadores electromagneticos fabricados con fundiciones nodulares ferriticas.
FR2709133B1 (fr) * 1993-08-18 1995-11-10 Tech Ind Fonderie Centre Procédé de traitement intercritique de charges en fonte.
FR2712606B1 (fr) * 1993-11-19 1996-02-09 Tech Ind Fonderie Centre Procédé d'élaboration d'une charge de fonte à graphite sphéroïdal à caractéristiques mécaniques élevées.
SE0200124D0 (sv) * 2002-01-18 2002-01-18 Ingenjoers N Allan Persson Hab Legerat segjärn
ITMI20021670A1 (it) * 2002-07-26 2004-01-26 Erre Vis S P A Ghisa sferoidale particolarmente per la realizzazione di segmenti elastici di tenuta per pistoni di motori a combustione interna
EP1534867A2 (en) * 2002-09-04 2005-06-01 Intermet Corporation Austempered cast iron article and a method of making the same
DE10344073A1 (de) * 2003-09-23 2005-04-28 Daimler Chrysler Ag Kurbelwelle mit kombiniertem Antriebszahnrad sowie Verfahren zu ihrer Herstellung und deren Verwendung
DE102008050152B4 (de) 2008-10-01 2013-05-23 Claas Guss Gmbh Hochfeste, duktile Gusseisenlegierung mit Kugelgraphit sowie Verfahren zu deren Herstellung
IT1403676B1 (it) * 2011-02-02 2013-10-31 Fonderia Anselmi S P A Manufatti in ferrolega
US20200131606A1 (en) * 2018-10-30 2020-04-30 GM Global Technology Operations LLC High-strength nodular iron with good weldability and machinability

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR89010E (enrdf_load_stackoverflow) * 1967-07-19
US2485760A (en) * 1947-03-22 1949-10-25 Int Nickel Co Cast ferrous alloy
DE1054102B (de) * 1955-07-08 1959-04-02 Teves Kg Alfred Verfahren zum Herstellen eines Gusseisens mit nadelfoermigem Zwischenstufengefuege
DE1123353B (de) * 1957-03-14 1962-02-08 Teves Kg Alfred Verfahren zur Herstellung von gusseisernen Kolbenringen
FR1286077A (fr) * 1961-01-20 1962-03-02 Renault Acier et traitement pour l'obtention de pièces à coefficient de dilatation thermique élevé
US3549430A (en) * 1967-11-14 1970-12-22 Int Nickel Co Bainitic ductile iron having high strength and toughness
US3860457A (en) * 1972-07-12 1975-01-14 Kymin Oy Kymmene Ab A ductile iron and method of making it
FI56699C (fi) * 1976-10-05 1980-03-10 Kymin Oy Kymmene Ab Maskinelement av segjaern foer kraftoeverfoering medelst friktion

Also Published As

Publication number Publication date
DE2853870A1 (de) 1980-07-03
JPS5594459A (en) 1980-07-17
DE2853870C2 (enrdf_load_stackoverflow) 1987-08-06
EP0018445A1 (de) 1980-11-12
JPS5910988B2 (ja) 1984-03-13
DE2967045D1 (en) 1984-07-12
EP0018445B1 (de) 1984-06-06
ZA796750B (en) 1980-11-26

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