EP0018445A1 - Process for the manufacture of castings of nodular castiron - Google Patents

Process for the manufacture of castings of nodular castiron Download PDF

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Publication number
EP0018445A1
EP0018445A1 EP79200725A EP79200725A EP0018445A1 EP 0018445 A1 EP0018445 A1 EP 0018445A1 EP 79200725 A EP79200725 A EP 79200725A EP 79200725 A EP79200725 A EP 79200725A EP 0018445 A1 EP0018445 A1 EP 0018445A1
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Prior art keywords
temperature
minutes
cast iron
possibly
casting
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EP79200725A
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German (de)
French (fr)
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EP0018445B2 (en
EP0018445B1 (en
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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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    • 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 spheroidal graphite cast iron produced by a corresponding heat treatment and cooling and having an austenitic-bainitic mixed structure and a process for the production thereof.
  • a spheroidal graphite cast iron with such basic structures and their mechanical properties is, apart from the usual areas of application, also suitable as a construction material for areas in which, until now, only tempered steels have been used, e.g. Crankshafts for motor vehicle engines, segment shafts and pistons for hydraulic steering systems, kingpins for truck fifth wheel couplings, cardan shaft heads for motor vehicle cardan shafts, coupling bodies for trailer couplings.
  • spheroidal graphite cast iron grades with a bainitic structure have long been known and used as high-strength and wear-resistant materials.
  • the castings are generally heated to an austenitizing temperature of 920 to 950 ° C. during manufacture and held there for 2 to 5 hours until the matrix has reached an approximately uniform carbon content and any leather burit present has been dissolved after casting.
  • the castings are then cooled so quickly that premature austenite conversion to pearlite is avoided before the isothermal bainite transition temperature is reached.
  • the casting is kept 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).
  • From DE-OS 23 34 992 is also a weakly alloyed cast iron with spheroidal graphite with the conventional amounts of carbon, silicon, phosphorus, sulfur and magnesium and a molybdenum addition of 0.10 to 0.26% and a manganese addition of 0.3 to 1.4% known.
  • the resulting casting is heated to an austenitizing temperature of 900 ° C and after a holding time cooled for two hours in a bath of 300 ° C in 10 minutes to 4 hours.
  • an austenitic-bainitic structure can be set which has a tensile strength of 1100 N / mm 2 , an elongation at break of 10% and a hardness of 270 to 300 HB.
  • the solution to this problem consists in a spheroidal graphite cast iron which, according to the invention, in addition to the usual amounts of carbon, silicon, phosphorus, sulfur and magnesium as an additive, also> 0 to ⁇ 0.3%, but preferably 0.01 to 0.25%, Contains manganese.
  • This cast iron with spheroidal graphite is suitable for producing an austenitic-bainitic structure, wherein according to the invention the casting to an austenitizing temperature 800-860 ° C, preferably 820-830 o C, heated at this temperature for 10 to 60 minutes, preferably 10 to 25 minutes , and is then rapidly cooled to a temperature of 350 to 400 ° C, preferably 375 ° C, in less than 2 minutes and held at this temperature for about 5 to 60 minutes, preferably 20 to 25 minutes. It is then cooled to room temperature.
  • an austenitizing temperature 800-860 ° C, preferably 820-830 o C heated at this temperature for 10 to 60 minutes, preferably 10 to 25 minutes , and is then rapidly cooled to a temperature of 350 to 400 ° C, preferably 375 ° C, in less than 2 minutes and held at this temperature for about 5 to 60 minutes, preferably 20 to 25 minutes. It is then cooled to room temperature.
  • the spheroidal graphite cast iron can also be used individually or in groups of> 0 to 3% nickel, 0.2 to 0.8%, preferably 0.25 to 0.4% molybdenum and 0.1 to 1.5%, preferably 0.4 up to 0.6%, copper included.
  • the carbon content is 2.5 to 3.7%, preferably 3.0 to 3.2% and the silicon content is 2.0 to 3.0%, preferably 2.2 to 2.6%.
  • the drawing shows the photographic representation of a micrograph of the cast iron type according to the invention with spheroidal graphite with a bainitic-austenitic structure with embedded spherolites, the dark needles representing bainite and the light structural components austenite.

Abstract

1. Method of producing castings from cast iron with spheroidal graphite with a mixed austenitic-bainitic mixed structure from a melt with the usual amounts of silicon, carbon, phosphorus, sulphur and magnesium and also additional amounts of manganese, molybdenum, possibly copper and possibly nickel, in which the casting is heated to austenitisation temperature and is also maintained, until austenitisation, at this temperature and thereafter is cooled to bainitisation temperature of 350 to 400 degrees C and is held at this temperature for a time corresponding to the required bainite fraction, wherein the melt contains less than 0.3% manganese, 0.2 to 0.8% molybdenum, possibly 0.1 to 1.5% copper and possibly up to 3% nickel and wherein the casting is brought to an austenitisation temperature of 800 to 860 degrees C, is maintained for 10 to 60 minutes at this temperature, is thereafter cooled in a time of less than 2 minutes to the bainitisation temperature and is maintained at this temperature for 5 to 60 minutes.

Description

Die Erfindung betrifft ein durch eine entsprechende Wärmebehandlung und Abkühlung hergestelltes Gußeisen mit Kugelgraphit mit austenitisch-bainitischem Mischgefüge und ein Verfahren zu dessen Herstellung.The invention relates to a spheroidal graphite cast iron produced by a corresponding heat treatment and cooling and having an austenitic-bainitic mixed structure and a process for the production thereof.

Ein Gußeisen mit Kugelgraphit mit solchen Grundgefügen und deren mechanische Eigenschaften ist, abgesehen von den üblichen Anwendungsbereichen, auch als Konstruktionswerkstoff für Bereiche geeignet, in denen bisher ausschließlich Vergütungsstähle eingesetzt wurden, wie z.B. Kurbelwellen für Kraftfahrzeugmotoren, Segmentwellen und Kolben für Hydrolenkungen, Zugsattelzapfen für LKW-Sattelkupplungen, Gelenkwellenköpfe für Kraftfahrzeug-Gelenkwellen, Kupplungskörper für Anhängerkupplungen.A spheroidal graphite cast iron with such basic structures and their mechanical properties is, apart from the usual areas of application, also suitable as a construction material for areas in which, until now, only tempered steels have been used, e.g. Crankshafts for motor vehicle engines, segment shafts and pistons for hydraulic steering systems, kingpins for truck fifth wheel couplings, cardan shaft heads for motor vehicle cardan shafts, coupling bodies for trailer couplings.

Unter den Gußeisen mit Kugelgraphit sind Sorten mit bainitischem Gefüge seit langem als hochfeste und verschleißbeständige Werkstoffe bekannt und im Einsatz. Dabei werden die Gußstücke bei der Herstellung im allgemeinen auf Austenitisierungstemperatur von 920 bis 950°C erhitzt und dort 2 bis 5 Stunden gehalten, bis die Matrix einen etwa gleichmäßigen Kohlenstoffgehalt angenommen hat und eventuell nach dem Gießen vorhandener Ledeburit aufgelöst ist.Among the spheroidal graphite cast iron, grades with a bainitic structure have long been known and used as high-strength and wear-resistant materials. The castings are generally heated to an austenitizing temperature of 920 to 950 ° C. during manufacture and held there for 2 to 5 hours until the matrix has reached an approximately uniform carbon content and any leather burit present has been dissolved after casting.

Nach dem Austenitisieren werden die Gußstücke dann so rasch abgekühlt, daß eine vorzeitige Austenitumwandlung zu Perlit vor Erreichen der isothermen Bainit-Umwandlungstemperatur vermieden wird. Auf dieser Temperatur wird das Gußstück solange gehalten, bis die Bainitreaktion abgelaufen ist. Danach wird - wie üblich - auf Raumtemperatur abgekühlt (Gießerei 65 (1978) Nr. 4, Seiten 73 bis 80).After austenitizing, the castings are then cooled so quickly that premature austenite conversion to pearlite is avoided before the isothermal bainite transition temperature is reached. The casting is kept 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).

Bekannt ist ferner Gußeisen mit Kugelgraphit mit bainitischem Gefüge, bei dem von einem legierten Gußeisen ausgegangen wird und direkt im Zusammenhang mit dem dem Gießprozeß anschließenden Abkühlungsvorgang eine Bainitreaktion durch auf die Wandstärke des Gußstücks abgestellten Gehalt an Nickel, Molybdän, Kupfer, eventuell auch Chrom und Mangan erzeugt wird (DE-OS 18 08 515).Also known is spheroidal graphite cast iron with a bainitic structure, in which an alloyed cast iron is assumed and, directly in connection with the cooling process following the casting process, a bainite reaction by means of nickel, molybdenum, copper, possibly also chromium and manganese, which is adjusted to the wall thickness of the casting is generated (DE-OS 18 08 515).

Aus der DE-OS 23 34 992 ist ferner ein schwach legiertes Gußeisen mit Kugelgraphit mit den herkömmlichen Mengen an Kohlenstoff, Silizium, Phosphor, Schwefel und Magnesium und einem Molybdänzusatz von 0,10 bis 0,26 % sowie einem Manganzusatz von 0,3 bis 1,4 % bekannt. Das daraus bestehende Gußstück wird auf eine Austenitisierungstemperatur von 900°C erwärmt und nach einer Haltezeit von zwei Stunden Dauer in einem Bad von 300°C in 10 Minuten bis 4 Stunden abgekühlt. Infolge dieser Maßnahmen läßt sich ein austenitisch-bainitisches Gefüge einstellen, das eine Zugfestigkeit von 1100 N/mm2, eine Bruchdehnung von 10 % und eine Härte von 270 bis 300 HB aufweist.From DE-OS 23 34 992 is also a weakly alloyed cast iron with spheroidal graphite with the conventional amounts of carbon, silicon, phosphorus, sulfur and magnesium and a molybdenum addition of 0.10 to 0.26% and a manganese addition of 0.3 to 1.4% known. The resulting casting is heated to an austenitizing temperature of 900 ° C and after a holding time cooled for two hours in a bath of 300 ° C in 10 minutes to 4 hours. As a result of these measures, an austenitic-bainitic structure can be set which has a tensile strength of 1100 N / mm 2 , an elongation at break of 10% and a hardness of 270 to 300 HB.

Es ist die Aufgabe der vorliegenden Erfindung, die Herstellung eines Gußeisens mit Kugelgraphit mit einem austenitisch-bainitischem Mischgefüge zu verbessern, ohne die für die Anwendung günstigen Werkstoffwerte zu beeinträchtigen.It is the object of the present invention to improve the production of a spheroidal graphite cast iron with an austenitic-bainitic mixed structure without impairing the material values which are favorable for the application.

Die Lösung dieser Aufgabe besteht in einem Gußeisen mit Kugelgraphit, das erfindungsgemäß neben den üblichen Mengen an Kohlenstoff, Silizium, Phosphor, Schwefel und Magnesium als Zusatz noch > 0 bis <0,3 %, vorzugsweise jedoch 0,01 bis 0,25 %, Mangan enthält.The solution to this problem consists in a spheroidal graphite cast iron which, according to the invention, in addition to the usual amounts of carbon, silicon, phosphorus, sulfur and magnesium as an additive, also> 0 to <0.3%, but preferably 0.01 to 0.25%, Contains manganese.

Dieses Gußeisen mit Kugelgraphit eignet sich zur Herstellung eines austenitisch-bainitischen Gefüges, wobei erfindungsgemäß das Gußstück auf eine Austenitisierungstemperatur von 800 bis 860°C, vorzugsweise 820 bis 830oC, erhitzt und auf dieser Temperatur 10 bis 60 Minuten, vorzugsweise 10 bis 25 Minuten, gehalten wird und dann rasch in weniger als 2 Minuten auf eine Temperatur von 350 bis 400°C, vorzugsweise 375°C, abgekühlt und auf dieser Temperatur etwa 5 bis 60 Minuten, vorzugsweise 20 bis 25 Minuten, gehalten wird. Anschließend erfolgt die Abkühlung auf Raumtemperatur.This cast iron with spheroidal graphite is suitable for producing an austenitic-bainitic structure, wherein according to the invention the casting to an austenitizing temperature 800-860 ° C, preferably 820-830 o C, heated at this temperature for 10 to 60 minutes, preferably 10 to 25 minutes , and is then rapidly cooled to a temperature of 350 to 400 ° C, preferably 375 ° C, in less than 2 minutes and held at this temperature for about 5 to 60 minutes, preferably 20 to 25 minutes. It is then cooled to room temperature.

Das Gußeisen mit Kugelgraphit kann noch einzeln oder zu mehreren >0 bis 3 % Nickel, 0,2 bis 0,8 %, vorzugsweise 0,25 bis 0,4 % Molybdän und 0,1 bis 1,5 %, vorzugsweise 0,4 bis 0,6 %, Kupfer enthalten.The spheroidal graphite cast iron can also be used individually or in groups of> 0 to 3% nickel, 0.2 to 0.8%, preferably 0.25 to 0.4% molybdenum and 0.1 to 1.5%, preferably 0.4 up to 0.6%, copper included.

Der Kohlenstoffgehalt beträgt 2,5 bis 3,7 %, vorzugsweise 3,0 bis 3,2 % und der Siliziumgehalt 2,0 bis 3,0 %, vorzugsweise 2,2 bis 2,6 %.The carbon content is 2.5 to 3.7%, preferably 3.0 to 3.2% and the silicon content is 2.0 to 3.0%, preferably 2.2 to 2.6%.

Der mit der Erfindung erzielte Vorteil ist darin zu sehen, daß gegenüber dem Stand der Technik ein erheblich geringerer Aufwand für die Wärmebehandlung erforderlich ist, ohne daß dadurch die guten Werkstoffkennwerte der ein austenitisch-bainitisches Gefüge aufweisenden Gußeisen mit Kugelgraphit beeinträchtigt werden.The advantage achieved with the invention can be seen in the fact that, compared to the prior art, considerably less effort is required for the heat treatment, without the good material properties of the cast iron having spheroidal graphite having an austenitic-bainitic structure being impaired thereby.

Die Zeichnung zeigt die photographische Darstellung eines Schliffbildes der erfindungsgemäßen Gußeisensorte mit Kugelgraphit mit bainitisch-austenitischem Gefüge mit eingelagerten Sphäroliten, wobei die dunklen Nadeln Bainit und die hellen Gefügebestandteile Austenit darstellen.The drawing shows the photographic representation of a micrograph of the cast iron type according to the invention with spheroidal graphite with a bainitic-austenitic structure with embedded spherolites, the dark needles representing bainite and the light structural components austenite.

Claims (5)

1. Gußeisen mit Kugelgraphit mit austenitisch-bainitischem Mischgefüge, gekennzeichnet durch einen Mangangehalt von > 0 bis < 0,3 %, vorzugsweise 0,01 bis 0,25 %.1. Spheroidal graphite cast iron with an austenitic-bainitic mixed structure, characterized by a manganese content of> 0 to <0.3%, preferably 0.01 to 0.25%. 2. Gußeisen nach Anspruch 1, gekennzeichnet durch einen oder mehrere Zusätze von > 0 bis 3 % Nickel, 0,2 bis 0,8 %, vorzugsweise 0,25 bis 0,4 % Molybdän und 0,1 bis 1,5 %, vorzugsweise 0,4 bis 0,6 %, Kupfer.2. Cast iron according to claim 1, characterized by one or more additions of> 0 to 3% nickel, 0.2 to 0.8%, preferably 0.25 to 0.4% molybdenum and 0.1 to 1.5%, preferably 0.4 to 0.6%, copper. 3. Gußeisen nach den Ansprüchen 1 und/oder 2, gekennzeichnet durch einen Siliziumgehalt von 2,0 bis 3, 0 %, vorzugsweise 2,2 bis 2,6 %.3. Cast iron according to claims 1 and / or 2, characterized by a silicon content of 2.0 to 3.0%, preferably 2.2 to 2.6%. 4. Gußeisen nach einem oder mehreren der Ansprüche 1 bis 3, gekennzeichnet durch einen Kohlenstoffgehalt von 2,5 bis 3,7 %, vorzugsweise 3,0 bis 3,2 %.4. Cast iron according to one or more of claims 1 to 3, characterized by a carbon content of 2.5 to 3.7%, preferably 3.0 to 3.2%. 5. Verfahren zur Herstellung des Gußeisens nach den Ansprüchen 1 bis 4, gekennzeichnet durch eine 10 bis 60 Minuten, vorzugsweise 10 bis 25 Minuten, dauernde austenitische Wärmebehandlung bei Temperaturen von 800 bis 860°C, vorzugsweise 820 bis 830°C, sowie einer anschließenden raschen weniger als 2 Minuten dauernden Abkühlung auf eine Temperatur von 350 bis 400°C, vorzugsweise etwa 375°C, auf der das Gußstück etwa 5 bis 60 Minuten, vorzugsweise 20 bis 25 Minuten, gehalten wird.5. A method for producing the cast iron according to claims 1 to 4, characterized by a 10 to 60 minutes, preferably 10 to 25 minutes, continuous austenitic heat treatment at temperatures of 800 to 860 ° C, preferably 820 to 830 ° C, and a subsequent rapidly cooling for less than 2 minutes to a temperature of 350 to 400 ° C, preferably about 375 ° C, at which the casting is held for about 5 to 60 minutes, preferably 20 to 25 minutes.
EP79200725A 1978-12-13 1979-12-05 Process for the manufacture of castings of nodular castiron Expired - Lifetime EP0018445B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2853870 1978-12-13
DE19782853870 DE2853870A1 (en) 1978-12-13 1978-12-13 BALL GRAPHITE CAST IRON WITH AUSTENITIC-BAINITIC MIXED TEXTURE

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EP0018445A1 true EP0018445A1 (en) 1980-11-12
EP0018445B1 EP0018445B1 (en) 1984-06-06
EP0018445B2 EP0018445B2 (en) 1990-01-03

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EP (1) EP0018445B2 (en)
JP (1) JPS5910988B2 (en)
DE (2) DE2853870A1 (en)
ZA (1) ZA796750B (en)

Cited By (12)

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Publication number Priority date Publication date Assignee Title
WO1983001959A1 (en) * 1981-12-03 1983-06-09 Hauke, Wilhelm Process for the bainitic hardening at least partially isothermally of a cast iron part
FR2522291A1 (en) * 1982-03-01 1983-09-02 Pont A Mousson CENTRIFUGAL CAST IRON WITH SPHEROIDAL GRAPHITE AND MANUFACTURING METHOD THEREOF
EP0144907A2 (en) * 1983-12-05 1985-06-19 Nissan Motor Co., Ltd. Method of producing austempered spheroidal graphite cast iron body
EP0203050A1 (en) * 1985-05-22 1986-11-26 Ab Volvo A method for manufacturing austempered spheroidal graphite iron
EP0347568A2 (en) * 1988-06-23 1989-12-27 MAHLE-J. WIZEMANN GmbH &amp; Co. KG Method of making wear-resisting castings
EP0639651A1 (en) * 1993-08-18 1995-02-22 Centre Technique Des Industries De La Fonderie Intercritical heat treatment of cast iron workpieces
FR2712606A1 (en) * 1993-11-19 1995-05-24 Tech Ind Fonderie Centre Spheroidal graphite cast iron@ with high toughness
EP1344839A1 (en) * 2002-01-18 2003-09-17 Ing.Firman Allan Persson HAB Alloyed nodular cast iron
EP1384794A1 (en) * 2002-07-26 2004-01-28 Erre-Vis S.p.A. Spheroidal cast iron particulary for piston rings and method for its production
WO2004022792A2 (en) * 2002-09-04 2004-03-18 Intermet Corporation Austempered cast iron article and a method of making the same
DE102008050152A1 (en) 2008-10-01 2010-04-08 Claas Guss Gmbh Preparing ductile and highly solid cast iron comprises e.g. completely melting and heating a precursor at specific temperature, overheating, deslagging, adjusting tapping temperature, subjecting to magnesium treatment, casting and molding
ITMI20110141A1 (en) * 2011-02-02 2012-08-03 Fonderia Anselmi S P A MANUFACTURED IN FERROLEGA

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JPS59157221A (en) * 1983-02-25 1984-09-06 Hitachi Metals Ltd Manufacture of spheroidal graphite cast iron
US4619713A (en) * 1983-02-25 1986-10-28 Hitachi Metals, Ltd. Method of producing nodular graphite cast iron
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 (en) * 1984-12-05 1986-06-24 Ngk Insulators Ltd Cast metallic mold for molding plastic
JPS61264156A (en) * 1985-01-30 1986-11-22 Asahi Malleable Iron Co Ltd Spheroidal graphite cast iron having bainite matrix and its manufacture
JPS61264155A (en) * 1985-01-30 1986-11-22 Asahi Malleable Iron Co Ltd Spheroidal graphite cast iron having bainite matrix and its manufacture
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US4737199A (en) * 1985-12-23 1988-04-12 Ford Motor Company Machinable ductile or semiductile cast iron and method
JPS62214123A (en) * 1986-03-17 1987-09-19 Kubota Ltd Manufacture of high strength ductile cast iron
JPS63227744A (en) * 1987-03-17 1988-09-22 Mazda Motor Corp Spheroidal graphite cast iron casting and its production
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US4880477A (en) * 1988-06-14 1989-11-14 Textron, Inc. Process of making an austempered ductile iron article
JPH04333369A (en) * 1991-05-07 1992-11-20 Hitachi Zosen Corp Welding equipment for column of structure
ES2048656B1 (en) * 1992-07-09 1994-10-16 Frenos Electricos Unidos Sa INDUCED ROTORS OF ELECTROMAGNETIC SLOWS MADE WITH FERRITIC NODULAR FOUNDRIES.
DE10344073A1 (en) * 2003-09-23 2005-04-28 Daimler Chrysler Ag Crankshaft with combined drive gear and process for their preparation and their use
US20200131606A1 (en) * 2018-10-30 2020-04-30 GM Global Technology Operations LLC High-strength nodular iron with good weldability and machinability

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DE1123353B (en) * 1957-03-14 1962-02-08 Teves Kg Alfred Process for the production of cast iron piston rings
FR1591761A (en) * 1967-11-14 1970-05-04
DE2334992A1 (en) * 1972-07-12 1974-02-07 Kymin Oy Kymmene Ab ALLOY CAST IRON WITH BALL GRAPHITE

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983001959A1 (en) * 1981-12-03 1983-06-09 Hauke, Wilhelm Process for the bainitic hardening at least partially isothermally of a cast iron part
FR2522291A1 (en) * 1982-03-01 1983-09-02 Pont A Mousson CENTRIFUGAL CAST IRON WITH SPHEROIDAL GRAPHITE AND MANUFACTURING METHOD THEREOF
EP0087634A1 (en) * 1982-03-01 1983-09-07 Pont-A-Mousson S.A. Centrifugally cast tube made from spheroidal graphite cast iron, and process for the manufacture thereof
GB2117000A (en) * 1982-03-01 1983-10-05 Pont A Mousson Centrifugally cast tube of spheroidal graphite cast-iron and its method of manufacture
EP0144907A2 (en) * 1983-12-05 1985-06-19 Nissan Motor Co., Ltd. Method of producing austempered spheroidal graphite cast iron body
EP0144907A3 (en) * 1983-12-05 1986-11-05 Nissan Motor Co., Ltd. Method of producing austempered spheroidal graphite cast iron body
EP0203050A1 (en) * 1985-05-22 1986-11-26 Ab Volvo A method for manufacturing austempered spheroidal graphite iron
EP0347568A2 (en) * 1988-06-23 1989-12-27 MAHLE-J. WIZEMANN GmbH &amp; Co. KG Method of making wear-resisting castings
EP0347568A3 (en) * 1988-06-23 1991-04-03 MAHLE-J. WIZEMANN GmbH &amp; Co. KG Method of making wear-resisting castings
EP0639651A1 (en) * 1993-08-18 1995-02-22 Centre Technique Des Industries De La Fonderie Intercritical heat treatment of cast iron workpieces
FR2709133A1 (en) * 1993-08-18 1995-02-24 Tech Ind Fonderie Centre Intercritical treatment process for cast iron charges.
FR2712606A1 (en) * 1993-11-19 1995-05-24 Tech Ind Fonderie Centre Spheroidal graphite cast iron@ with high toughness
EP1344839A1 (en) * 2002-01-18 2003-09-17 Ing.Firman Allan Persson HAB Alloyed nodular cast iron
EP1384794A1 (en) * 2002-07-26 2004-01-28 Erre-Vis S.p.A. Spheroidal cast iron particulary for piston rings and method for its production
WO2004022792A2 (en) * 2002-09-04 2004-03-18 Intermet Corporation Austempered cast iron article and a method of making the same
WO2004022792A3 (en) * 2002-09-04 2004-06-17 Intermet Corp Austempered cast iron article and a method of making the same
US7070666B2 (en) 2002-09-04 2006-07-04 Intermet Corporation Machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same
CN100398672C (en) * 2002-09-04 2008-07-02 英特米特公司 Austempered cast iron article and a method of making the same
US7497915B2 (en) 2002-09-04 2009-03-03 Intermet Corporation Machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking
DE102008050152A1 (en) 2008-10-01 2010-04-08 Claas Guss Gmbh Preparing ductile and highly solid cast iron comprises e.g. completely melting and heating a precursor at specific temperature, overheating, deslagging, adjusting tapping temperature, subjecting to magnesium treatment, casting and molding
ITMI20110141A1 (en) * 2011-02-02 2012-08-03 Fonderia Anselmi S P A MANUFACTURED IN FERROLEGA

Also Published As

Publication number Publication date
EP0018445B2 (en) 1990-01-03
EP0018445B1 (en) 1984-06-06
DE2967045D1 (en) 1984-07-12
JPS5594459A (en) 1980-07-17
JPS5910988B2 (en) 1984-03-13
ZA796750B (en) 1980-11-26
DE2853870C2 (en) 1987-08-06
DE2853870A1 (en) 1980-07-03

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