US20040219052A1 - High-strength, high-ductility noudlar iron, and transmission housing produced therefrom - Google Patents

High-strength, high-ductility noudlar iron, and transmission housing produced therefrom Download PDF

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Publication number
US20040219052A1
US20040219052A1 US10/486,154 US48615404A US2004219052A1 US 20040219052 A1 US20040219052 A1 US 20040219052A1 US 48615404 A US48615404 A US 48615404A US 2004219052 A1 US2004219052 A1 US 2004219052A1
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United States
Prior art keywords
percent
cast iron
nodular cast
strength
iron
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Abandoned
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US10/486,154
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English (en)
Inventor
Oskar Kehrer
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.)
Magna Steyr Powertrain AG and Co KG
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Individual
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Filing date
Publication date
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Assigned to MAGNA STEYR POWERTRAIN AG & CO KG reassignment MAGNA STEYR POWERTRAIN AG & CO KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KEHRER, OSKAR
Publication of US20040219052A1 publication Critical patent/US20040219052A1/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
    • C22C37/10—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 nodular cast iron with alloyed-in silicon, as is customarily used for castings which are subject to high loads, for example the following DIN or SAE [in square parentheses] materials:
  • the first (a)) is still ferritic and therefore ductile, but its strength is only moderate. If the strength needs to be higher, materials b), c) and d) are used; in order, they range from ferritic-pearlitic to purely pearlitic, with a considerable drop in ductility and weldability. These materials have, to an extent which increases from a) to d), a multiphase (ferritic-pearlitic) basic structure of locally differing composition, a characteristic which is further amplified by the locally different cooling conditions which are inevitable during casting and leads to problems during the subsequent, in particular chip-forming, machining. Therefore, the use of these materials is restricted to particular applications.
  • U.S. Pat. No. 4,484,953 has disclosed a cast iron to which a high ductility and hardness are imparted by means of a complex heat treatment, which requires a very high nickel content. Both the nickel content and the heat treatment make this material disproportionately expensive.
  • a nodular cast iron according to the invention contains: 4 to 6 percent of silicon and a carbon content which has been reduced by an amount corresponding to the carbon equivalent, at most 0.03 percent of phosphorus, 0.2 to 0.5 percent of nickel, remainder iron and inevitable impurities.
  • the high silicon content has the effect of stabilizing ferrite and also increases the strength.
  • the carbon equivalent requires a corresponding reduction in the carbon content. Since phosphorus has an embrittling action, on account of the considerable solid-solution strengthening of the compounds which it forms, the phosphorus content should be kept as low as possible. Nickel also reduces the brittleness and increases the strength, and in this context the amounts required are so low that the additional costs entailed are negligible.
  • the strength is not obtained by means of a higher pearlite content, as is the case with nodular cast iron of the prior art, but rather by solid-solution strengthening.
  • the combination of these measures results in a considerable increase in strength while maintaining a good ductility and weldability.
  • the quantitative ratios at which particularly good values have been achieved are 4.1 to 4.5 percent of silicon and 0.25 to 0.35 percent of nickel. Limiting the copper content to below the normal amount intensifies the action of the measures according to the invention., since copper is a pearlite-forming agent.
  • the invention also relates to casings, in particular transmission casings, which consist of the nodular cast iron as claimed in one of the preceding claims.
  • casings in particular transmission casings, which consist of the nodular cast iron as claimed in one of the preceding claims.
  • a transmission casing of this type can have thinner walls and can be of reduced weight.
  • chip-forming machining which is required in order to form connection flanges and bearing seats.
  • a transmission casing made from the material according to the invention can be welded to a toothed part made from alloyed and/or case-hardened steel.
  • FIG. 1 shows a comparison of nodular cast iron according to the prior art with a nodular cast iron which has been improved in accordance with the invention
  • FIG. 2 shows a section through a transmission casing according to the invention.
  • FIG. 1 compares the properties of the materials according to the prior art denoted a) to d) above, in the first four columns, with those of the material which has been improved in accordance with the invention, in the fifth column.
  • the numbers and details speak for themselves and underline what has been stated in the introduction to the description.
  • FIG. 2 shows the casing, for example the casing of a transmission, denoted by 1 , and a gearwheel, which is joined to the casing to form a single component and is denoted by 2 .
  • the casing 1 in this case consists of a nodular cast iron which has been improved in accordance with the invention.
  • the gearwheel 2 is made from steel which has been case-hardened.
  • the casing 1 has a first surface 3 which is to be welded, is normal to its axis and is adjoined by a cylindrical collar 4 which forms an outer cylindrical mating surface 5 .
  • the casing 1 may be provided, at a location of greater wall thickness, with a circumferential groove 6 which runs parallel to the first surface to be welded and is of rounded cross section.
  • a second surface 7 which is to be welded, lying in a plane which is normal to the axis, and a cylindrical mating surface 8 , which is seated on the cylindrical mating surface 5 , are provided on the gearwheel 2 .
  • the cylindrical mating surface 8 may be recessed at the transition to the second surface 7 which is to be welded, so that a gap 9 is formed. This facilitates production and makes it easier to push the gearwheel onto the collar 4 , and also, if necessary, improves full root welding.
  • the axis of rotation of the component is denoted by 18
  • the welding head is denoted by 20 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Details Of Gearings (AREA)
  • Gears, Cams (AREA)
  • Heat Treatment Of Articles (AREA)
US10/486,154 2001-08-07 2002-08-02 High-strength, high-ductility noudlar iron, and transmission housing produced therefrom Abandoned US20040219052A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATGM623/01 2001-08-07
AT0062301U AT5381U1 (de) 2001-08-07 2001-08-07 Sphäroguss hoher festigkeit und duktilität und daraus hergestelltes getriebegehäuse
PCT/AT2002/000234 WO2003014407A1 (de) 2001-08-07 2002-08-02 Spharoguss mit hoher festigkeit und duktilitat und daraus hergestelltes getriebegehause

Publications (1)

Publication Number Publication Date
US20040219052A1 true US20040219052A1 (en) 2004-11-04

Family

ID=3495482

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/486,154 Abandoned US20040219052A1 (en) 2001-08-07 2002-08-02 High-strength, high-ductility noudlar iron, and transmission housing produced therefrom

Country Status (7)

Country Link
US (1) US20040219052A1 (https=)
EP (1) EP1415009B1 (https=)
JP (1) JP2004537652A (https=)
KR (1) KR20040017853A (https=)
AT (2) AT5381U1 (https=)
CA (1) CA2456432A1 (https=)
WO (1) WO2003014407A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2546938C1 (ru) * 2014-02-25 2015-04-10 Юлия Алексеевна Щепочкина Чугун

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006038670B4 (de) * 2006-08-17 2010-12-09 Federal-Mogul Burscheid Gmbh Hochsiliziumhaltiger Stahlwerkstoff zur Herstellung von Kolbenringen und Zylinderlaufbuchsen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749463A (en) * 1970-10-13 1973-07-31 J Krapf Bearing mounting method and apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2456700C3 (de) * 1974-11-30 1980-07-31 Goetze Ag, 5093 Burscheid Dichtleiste für Rotationskolbenmotoren
DE3147461C2 (de) * 1981-12-01 1983-10-13 Goetze Ag, 5093 Burscheid Verschleißfeste Gußeisenlegierung hoher Festigkeit mit sphärolithischer Graphitausscheidung, ihr Herstellungsverfahren und ihre Verwendung
JPS6017819B2 (ja) * 1982-04-01 1985-05-07 マツダ株式会社 高温耐酸化性、耐熱疲労性に優れた球状黒鉛鋳鉄
US4484953A (en) * 1983-01-24 1984-11-27 Ford Motor Company Method of making ductile cast iron with improved strength
US4475956A (en) * 1983-01-24 1984-10-09 Ford Motor Company Method of making high strength ferritic ductile iron parts
DE19636808C1 (de) * 1996-09-11 1997-09-25 Harzer Grauguswerke Gmbh Gußeisen-Legierung für thermisch hochbelastete Motorenteile

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749463A (en) * 1970-10-13 1973-07-31 J Krapf Bearing mounting method and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2546938C1 (ru) * 2014-02-25 2015-04-10 Юлия Алексеевна Щепочкина Чугун

Also Published As

Publication number Publication date
JP2004537652A (ja) 2004-12-16
EP1415009A1 (de) 2004-05-06
ATE316586T1 (de) 2006-02-15
KR20040017853A (ko) 2004-02-27
CA2456432A1 (en) 2003-02-20
AT5381U1 (de) 2002-06-25
EP1415009B1 (de) 2006-01-25
WO2003014407A1 (de) 2003-02-20

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Date Code Title Description
AS Assignment

Owner name: MAGNA STEYR POWERTRAIN AG & CO KG, AUSTRIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KEHRER, OSKAR;REEL/FRAME:015415/0842

Effective date: 20040212

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION