EP1458518A2 - Graphitic cast iron of high mechanical strength - Google Patents

Graphitic cast iron of high mechanical strength

Info

Publication number
EP1458518A2
EP1458518A2 EP20020782550 EP02782550A EP1458518A2 EP 1458518 A2 EP1458518 A2 EP 1458518A2 EP 20020782550 EP20020782550 EP 20020782550 EP 02782550 A EP02782550 A EP 02782550A EP 1458518 A2 EP1458518 A2 EP 1458518A2
Authority
EP
European Patent Office
Prior art keywords
cast iron
high mechanical
graphite
graphitic cast
content
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.)
Withdrawn
Application number
EP20020782550
Other languages
German (de)
French (fr)
Other versions
EP1458518A4 (en
Inventor
Wilson Luiz Guesser
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.)
Tupy Fundicoes Ltda
Original Assignee
Tupy Fundicoes Ltda
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 Tupy Fundicoes Ltda filed Critical Tupy Fundicoes Ltda
Publication of EP1458518A2 publication Critical patent/EP1458518A2/en
Publication of EP1458518A4 publication Critical patent/EP1458518A4/en
Withdrawn legal-status Critical Current

Links

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
    • C22C37/10—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 present report is about a graphitic cast iron of high mechanical strength, and more specifically, a graphitic cast iron of high tensile strength with high capacity to damp vibrations, good heat conductivity, good machinability and free from solidification porosities.
  • This graphitic cast iron of high tensile strength being preferentially used in the production of internal combustion engine blocks and internal combustion engine heads.
  • cast iron As known cast iron is usually classified, according to its graphite form, in gray cast iron (graphite in the form of vein) , vermicular cast iron (graphite in the form of worms) and nodular cast iron (graphite in the form of nodules) . Each group of cast iron presents typical properties with specific uses and applications.
  • gray cast iron group due to its reasonable tensile strength (200 to 350 Mega Pascal of ultimate tensile strength) , its good heat conductivity, machinability and absence of solidification porosities even in complex geometry parts.
  • the vermicular cast iron has been increasingly applied to engine blocks and heads and to brake disks and drums, providing an ultimate tensile strength higher than that of the gray cast iron (300 to 500 Mega Pascal of ultimate tensile strength) , with intermediate values of heat conductivity.
  • Another unfavorable aspect observed is its capacity to damp vibrations which is smaller than the gray cast iron. This aspect shall be considered in the project of automotive components as vibration causes noise problems that shall be avoided.
  • the nodular cast iron group due to its high tensile strength (450 to 900 Mega Pascal) and to good elongation values (20 to 2%), has been used in several automotive and machine components.
  • its use in engine blocks and heads has been restricted to a few cases mainly due to the presence of solidification porosities and machinability much lower than the gray cast iron and the vermicular cast iron, and its low capacity to damp vibrations and low heat conductivity.
  • One of the goals of the present invention is to provide a graphitic cast iron of high tensile strength that presents an ultimate tensile strength up to 600 Mega Pascal, and an yield strength up to 380 Mega Pascal.
  • a graphitic cast iron of high tensile strength that presents a microstructure with adequate proportions of nodular graphite (forms I and II as per Standard ASTM A247) and adequate proportions of vermicular graphite (form IV as per Standard ASTM A247) ; the percentage of nodular graphite comprised in the range of 20- 40% and the percentage of vermicular graphite comprised in the range of 60-80% so that the total amount of graphite be 12-15% in volume, being the matrix a pearlitic one, and such microstructure of metallic matrix is comprised of refined pearlite.
  • the graphitic cast iron of high tensile strength thus, presents a content of Carbon from 3,5 to 3,9%, a content of Si from 2,0 to 2,6%, a content of Cr lower than 0,05%, a content of Mn lower than 0,40% and a content of Ti lower than 0,015 %; controlled additions of Cu, Sn, Ni and Mo are foreseen according to the thickness of the part.
  • this microstructure provided to the graphitic cast iron of high tensile strength, it is possible to counterbalance the contraction of surface solidification, thus, producing parts free from solidification porosities. At the same time, this microstructure presents good machinability due to the lubricant effect the graphite exerts on the cutting tool.

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

Graphitic cast iron of high mechanical strength, presenting a microstructure with adequate proportions of nodular graphite and adequate proportions of vermicular graphite to define a total amount of graphite in the range of 12-15 % in volume of the microstructure.

Description

*GRAPHITIC CAST IRON OF HIGH MECHANICAL STRENGHT"
The present report is about a graphitic cast iron of high mechanical strength, and more specifically, a graphitic cast iron of high tensile strength with high capacity to damp vibrations, good heat conductivity, good machinability and free from solidification porosities.
This graphitic cast iron of high tensile strength being preferentially used in the production of internal combustion engine blocks and internal combustion engine heads.
As known cast iron is usually classified, according to its graphite form, in gray cast iron (graphite in the form of vein) , vermicular cast iron (graphite in the form of worms) and nodular cast iron (graphite in the form of nodules) . Each group of cast iron presents typical properties with specific uses and applications.
In the case of internal combustion blocks and heads, it is usual to apply the gray cast iron group due to its reasonable tensile strength (200 to 350 Mega Pascal of ultimate tensile strength) , its good heat conductivity, machinability and absence of solidification porosities even in complex geometry parts.
The vermicular cast iron has been increasingly applied to engine blocks and heads and to brake disks and drums, providing an ultimate tensile strength higher than that of the gray cast iron (300 to 500 Mega Pascal of ultimate tensile strength) , with intermediate values of heat conductivity.
The biggest difficulties observed in the use of the latter are the presence of solidification porosity in certain geometries and low machinability, which reflects in the reduction of a cutting tool life if compared to gray cast iron.
Another unfavorable aspect observed is its capacity to damp vibrations which is smaller than the gray cast iron. This aspect shall be considered in the project of automotive components as vibration causes noise problems that shall be avoided.
The nodular cast iron group, due to its high tensile strength (450 to 900 Mega Pascal) and to good elongation values (20 to 2%), has been used in several automotive and machine components. On the other hand, its use in engine blocks and heads has been restricted to a few cases mainly due to the presence of solidification porosities and machinability much lower than the gray cast iron and the vermicular cast iron, and its low capacity to damp vibrations and low heat conductivity.
One of the goals of the present invention is to provide a graphitic cast iron of high tensile strength that presents an ultimate tensile strength up to 600 Mega Pascal, and an yield strength up to 380 Mega Pascal. These and other goals and advantages of the present invention are met with a graphitic cast iron of high tensile strength that presents a microstructure with adequate proportions of nodular graphite (forms I and II as per Standard ASTM A247) and adequate proportions of vermicular graphite (form IV as per Standard ASTM A247) ; the percentage of nodular graphite comprised in the range of 20- 40% and the percentage of vermicular graphite comprised in the range of 60-80% so that the total amount of graphite be 12-15% in volume, being the matrix a pearlitic one, and such microstructure of metallic matrix is comprised of refined pearlite.
The graphitic cast iron of high tensile strength, thus, presents a content of Carbon from 3,5 to 3,9%, a content of Si from 2,0 to 2,6%, a content of Cr lower than 0,05%, a content of Mn lower than 0,40% and a content of Ti lower than 0,015 %; controlled additions of Cu, Sn, Ni and Mo are foreseen according to the thickness of the part.
With this microstructure provided to the graphitic cast iron of high tensile strength, it is possible to counterbalance the contraction of surface solidification, thus, producing parts free from solidification porosities. At the same time, this microstructure presents good machinability due to the lubricant effect the graphite exerts on the cutting tool.
With a high amount of vermicular graphite in the structure of the graphitic cast iron of high tensile strength, it is also possible to obtain other properties such as good heat conductivity and the damping of vibrations .
The tensile strength advantages previously mentioned are, thus, increased.
Despite the fact that a preferred constructive concept has been described and illustrated, it is important to mention that changes are feasible and possible to be carried out without deviating from the scope of the present invention.

Claims

Claims
1- 'GRAPHITIC CAST IRON OF HIGH MECHANICAL STRENGHT" , characterized by presenting a microstructure with adequate proportions of nodular graphite and adequate proportions of vermicular graphite, being the percentage of nodular graphite in the range of 20-40% and the percentage of vermicular graphite in the range of 60-80%.
2- 'GRAPHITIC CAST IRON OF HIGH MECHANICAL STRENGHT", as per claim 1, characterized by presenting a total amount of graphite in the range of 12-15% in volume of the microstructure.
3- 'GRAPHITIC CAST IRON OF HIGH MECHANICAL STRENGHT", as per claim 1 or 2, characterized by presenting a microstructure of metallic matrix comprised of refined pearlite.
4- 'GRAPHITIC CAST IRON OF HIGH MECHANICAL STRENGHT", as per claim 1 or 2 or 3, characterized by presenting a content of Carbon from 3,5 to 3,9%, a content of Si from 2,0 to 2,6%, a content of Cr lower than 0,05%, a content of Mn lower than 0,40% and a content of Ti lower than 0,015 %; controlled additions of Cu, Sn, Ni and Mo are foreseen according to the thickness of the part.
5- 'GRAPHITIC CAST IRON OF HIGH MECHANICAL STRENGHT", as per claim 1 or 2 or 3 or 4, characterized by presenting an ultimate tensile strength up to 600 Mega Pascal and an yield strength up to 380 Mega Pascal.
EP02782550A 2001-11-27 2002-11-26 Graphitic cast iron of high mechanical strength Withdrawn EP1458518A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BR0105989A BR0105989B1 (en) 2001-11-27 2001-11-27 graphically cast iron of high mechanical resistance.
BR0105989 2001-11-27
PCT/BR2002/000165 WO2003045626A2 (en) 2001-11-27 2002-11-26 Graphitic cast iron of high mechanical strength

Publications (2)

Publication Number Publication Date
EP1458518A2 true EP1458518A2 (en) 2004-09-22
EP1458518A4 EP1458518A4 (en) 2004-12-15

Family

ID=3948160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02782550A Withdrawn EP1458518A4 (en) 2001-11-27 2002-11-26 Graphitic cast iron of high mechanical strength

Country Status (3)

Country Link
EP (1) EP1458518A4 (en)
BR (1) BR0105989B1 (en)
WO (1) WO2003045626A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102016021139B1 (en) * 2016-09-13 2021-11-30 Tupy S.A. VERMICULAR CAST IRON ALLOY AND INTERNAL COMBUSTION ENGINE HEAD
BR102016022690B1 (en) 2016-09-29 2022-02-08 Tupy S.A. VERMICULAR CAST IRON ALLOY FOR INTERNAL COMBUSTION ENGINE BLOCK AND HEAD
CN111676416A (en) * 2020-06-23 2020-09-18 飞龙汽车部件股份有限公司 Austenitic vermicular cast iron material

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860459A (en) * 1973-02-20 1975-01-14 British Steel Corp Ingot moulds
US4236944A (en) * 1977-10-24 1980-12-02 Sandvik Aktiebolag Cast iron especially suited for ingot molds
EP0032282A1 (en) * 1980-01-15 1981-07-22 Materials and Methods Limited Process for manufacture of cast iron with vermicular graphite and cast iron so produced
FR2487853A1 (en) * 1980-07-31 1982-02-05 Citroen Sa Cast iron with compact vermicular graphite - produced by separate inoculation with magnesium and cerium
US4412578A (en) * 1980-03-20 1983-11-01 Metallgesellschaft Ag Apparatus for treating molten cast iron
FR2531140A1 (en) * 1982-07-31 1984-02-03 Kubota Ltd Composite cylinder liner for marine IC engine
US4501612A (en) * 1983-10-27 1985-02-26 The University Of Alabama Compacted graphite cast irons in the iron-carbon-aluminum system
JPS61189833A (en) * 1985-02-19 1986-08-23 Kobe Chutetsusho:Kk Press metal die
US4830656A (en) * 1986-04-17 1989-05-16 Anciens Etablissements Caffier & Barreau Cast iron molds for glass making and method of making
EP0353804A1 (en) * 1988-07-16 1990-02-07 SKW Trostberg Aktiengesellschaft Process for the production of cast iron with spheroidal graphite and/or vermicular graphite
JPH04128340A (en) * 1990-09-19 1992-04-28 Hitachi Ltd Compact vermicular graphite cast iron and sheave for elevator using the same
EP0821073A1 (en) * 1996-07-25 1998-01-28 Federal-Mogul Burscheid GmbH Cast iron alloy for the production of piston rings for combustion engines
WO2000001860A1 (en) * 1998-07-03 2000-01-13 Sintercast Ab Compacted graphite cast iron alloy

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85107725B (en) * 1985-10-17 1987-12-23 陕西机械学院 Creeping graphite cast iron for manufacturing mould for glass bottle
US5858127A (en) * 1996-08-02 1999-01-12 Gunite Corporation Metal alloys and brake drums made from such alloys
SE9904257D0 (en) * 1999-11-23 1999-11-23 Sintercast Ab New cast iron alloy

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860459A (en) * 1973-02-20 1975-01-14 British Steel Corp Ingot moulds
US4236944A (en) * 1977-10-24 1980-12-02 Sandvik Aktiebolag Cast iron especially suited for ingot molds
EP0032282A1 (en) * 1980-01-15 1981-07-22 Materials and Methods Limited Process for manufacture of cast iron with vermicular graphite and cast iron so produced
US4412578A (en) * 1980-03-20 1983-11-01 Metallgesellschaft Ag Apparatus for treating molten cast iron
FR2487853A1 (en) * 1980-07-31 1982-02-05 Citroen Sa Cast iron with compact vermicular graphite - produced by separate inoculation with magnesium and cerium
FR2531140A1 (en) * 1982-07-31 1984-02-03 Kubota Ltd Composite cylinder liner for marine IC engine
US4501612A (en) * 1983-10-27 1985-02-26 The University Of Alabama Compacted graphite cast irons in the iron-carbon-aluminum system
JPS61189833A (en) * 1985-02-19 1986-08-23 Kobe Chutetsusho:Kk Press metal die
US4830656A (en) * 1986-04-17 1989-05-16 Anciens Etablissements Caffier & Barreau Cast iron molds for glass making and method of making
EP0353804A1 (en) * 1988-07-16 1990-02-07 SKW Trostberg Aktiengesellschaft Process for the production of cast iron with spheroidal graphite and/or vermicular graphite
JPH04128340A (en) * 1990-09-19 1992-04-28 Hitachi Ltd Compact vermicular graphite cast iron and sheave for elevator using the same
EP0821073A1 (en) * 1996-07-25 1998-01-28 Federal-Mogul Burscheid GmbH Cast iron alloy for the production of piston rings for combustion engines
WO2000001860A1 (en) * 1998-07-03 2000-01-13 Sintercast Ab Compacted graphite cast iron alloy

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
FULLER A G ET AL: "A report on the effect upon mechanical properties of variation in graphite from in irons having varying amounts of ferrite and pearlite in the matrix structure and the use of nondestructive tests in the assessments of mechanical properties of such irons" HCAPLUS, 1980, XP002968135 *
PATENT ABSTRACTS OF JAPAN vol. 0110, no. 14 (M-553), 14 January 1987 (1987-01-14) -& JP 61 189833 A (KOBE CHUTETSUSHO:KK), 23 August 1986 (1986-08-23) *
PATENT ABSTRACTS OF JAPAN vol. 0163, no. 94 (C-0976), 21 August 1992 (1992-08-21) -& JP 04 128340 A (HITACHI LTD), 28 April 1992 (1992-04-28) *
See also references of WO03045626A2 *

Also Published As

Publication number Publication date
WO2003045626A3 (en) 2004-03-18
WO2003045626A2 (en) 2003-06-05
EP1458518A4 (en) 2004-12-15
BR0105989A (en) 2002-11-12
BR0105989B1 (en) 2009-08-11

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