WO2007073280A1 - Process for production of compacted graphite iron - Google Patents

Process for production of compacted graphite iron Download PDF

Info

Publication number
WO2007073280A1
WO2007073280A1 PCT/SE2006/001424 SE2006001424W WO2007073280A1 WO 2007073280 A1 WO2007073280 A1 WO 2007073280A1 SE 2006001424 W SE2006001424 W SE 2006001424W WO 2007073280 A1 WO2007073280 A1 WO 2007073280A1
Authority
WO
WIPO (PCT)
Prior art keywords
iron
magnesium
cerium
mould
production
Prior art date
Application number
PCT/SE2006/001424
Other languages
English (en)
French (fr)
Inventor
Rudolf Sillen
Original Assignee
Novacast Technologies Ab
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 Novacast Technologies Ab filed Critical Novacast Technologies Ab
Priority to CN2006800481058A priority Critical patent/CN101341262B/zh
Priority to US12/086,637 priority patent/US20090183848A1/en
Priority to BRPI0620077-0A priority patent/BRPI0620077A2/pt
Priority to MX2008007968A priority patent/MX2008007968A/es
Priority to EP06835848A priority patent/EP1974062B1/en
Publication of WO2007073280A1 publication Critical patent/WO2007073280A1/en
Priority to US13/329,561 priority patent/US20120090803A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron
    • C21C1/105—Nodularising additive agents
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • 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

Definitions

  • the invention relates to a process for production of cast iron with a structure predominantly consisting of compacted graphite shapes.
  • the process is based on a combination of pre-treatment of a base iron and a final treatment in the mould.
  • Compacted graphite iron is a cast iron alloy with a graphite structure between flake type graphite shapes and spherical shapes.
  • the graphite shape is determined by the conditions in the liquid iron during the solidification.
  • Treatment of a base iron, preferably with a carbon equivalent between 4.0 and 4.4 and with a sulphur content below 0.02%, with a ferrosilicon alloy containing 4-10% magnesium can be used to achieve the compacted graphite structure.
  • the magnesium content must be kept within very narrow limits usually within +/- 0.003% and with a level of about 0.008 to 0.015% depending on conditions of the base iron and the cooling rate in the casting to be produced. As used herein percent refers to percent by weight.
  • the treatment with magnesium is usually made in a ladle.
  • the magnesium treatment can be made inside each mould. That technology known as in-mould treatment/technology is well-known for production of ductile iron. A special version of the technology as described in WO 01/54844 Al, is suitable for production of compacted graphite iron.
  • the in-mould technology is based on placing the magnesium alloy in a chamber in the gating system in the mould. During pouring, the iron flows into the chamber and gradually dis- solves the alloy. The treated metal then fills the casting cavity. The problems with fading of magnesium are eliminated when using this process.
  • the invention concerns a process for production of compacted graphite iron using in-mould addition of a magnesium alloy in accordance with claim 1.
  • Preferred embodiments are defined in the dependent claims.
  • the amount of cerium is adjusted in relation to the sulphur content in the base iron.
  • the cerium level should be adjusted according to the formula:
  • %Cerium (%Sulphur - 0.006)* 2.9 + A.
  • the value for A varies preferably between 0.01 and 0.03 depending on the configuration of the casting i.e. variation in section dimensions and casting modulus.
  • cerium has a very high boiling point (3470°C) and a high density (6.14 g/cm 3 ) it does not show any fading effect.
  • cerium By adding cerium to the base iron it can be properly dis- solved and less magnesium alloy has to be added in the reaction chamber in the mould as cerium also has a structure forming effect.
  • the treatment alloy preferably contains 3-6% magnesium and 0.5-1.5% lanthanum.
  • Lanthanum has a favourable effect in reducing defects such as carbides and shrinkages in the casting. The effect on shrinkages is highest just after treatment and therefore it is optimal to add the lanthanum as late as possible.
  • compositions for commercially available alloys include:
  • magnesium alloy 48% Fe, 45% Si, 5% Mg, 1.0% Al, 0.5% La and 0.5% Ca
  • Cerium alloy 65% Fe, 25% Ce, 7% La, and a balance of other rare earth elements .
  • cerium is added to the oven or the ladle (and not as a part of the magnesium alloy) and magnesium is added to the mould.
  • the magnesium addition can be reduced with at least 30% compared to a normal treatment in-the-mould without the pre-conditioning.
  • the reduced magnesium level in the castings has also the advantage that casting defects such as dross and micro- shrinkage are minimized.
PCT/SE2006/001424 2005-12-20 2006-12-14 Process for production of compacted graphite iron WO2007073280A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN2006800481058A CN101341262B (zh) 2005-12-20 2006-12-14 蠕墨铸铁的制造方法
US12/086,637 US20090183848A1 (en) 2005-12-20 2006-12-14 Process for Production of Compacted Graphite Iron
BRPI0620077-0A BRPI0620077A2 (pt) 2005-12-20 2006-12-14 processo para produção de ferro grafite compactado
MX2008007968A MX2008007968A (es) 2005-12-20 2006-12-14 Procedimiento para la produccion de hierro grafito compacto.
EP06835848A EP1974062B1 (en) 2005-12-20 2006-12-14 Process for production of compacted graphite iron
US13/329,561 US20120090803A1 (en) 2005-12-20 2011-12-19 Process for producton of compacted graphite iron

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0502817A SE529445C2 (sv) 2005-12-20 2005-12-20 Process för framställning av kompaktgrafitjärn
SE0502817-0 2005-12-20

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/329,561 Continuation US20120090803A1 (en) 2005-12-20 2011-12-19 Process for producton of compacted graphite iron

Publications (1)

Publication Number Publication Date
WO2007073280A1 true WO2007073280A1 (en) 2007-06-28

Family

ID=38188913

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/001424 WO2007073280A1 (en) 2005-12-20 2006-12-14 Process for production of compacted graphite iron

Country Status (8)

Country Link
US (2) US20090183848A1 (sv)
EP (1) EP1974062B1 (sv)
KR (1) KR20080089577A (sv)
CN (1) CN101341262B (sv)
BR (1) BRPI0620077A2 (sv)
MX (1) MX2008007968A (sv)
SE (1) SE529445C2 (sv)
WO (1) WO2007073280A1 (sv)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105785882A (zh) * 2016-05-09 2016-07-20 哈尔滨理工大学 一种球墨铸铁球化孕育处理动态调控方法及系统
EP3519602A4 (en) * 2016-09-29 2020-04-01 Tupy S.A. MIXING CAST IRON ALLOY FOR COMBUSTION ENGINE BLOCK AND HEAD

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104903470B (zh) * 2013-09-06 2017-12-12 东芝机械株式会社 球状石墨铸铁金属熔液的球状化处理方法
WO2018047134A1 (en) * 2016-09-12 2018-03-15 Snam Alloys Pvt Ltd A non-magnesium process to produce compacted graphite iron (cgi)
CN109371191A (zh) * 2018-11-09 2019-02-22 中船海洋动力部件有限公司 一种蠕墨铸铁的蠕化孕育方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB833486A (en) 1956-05-02 1960-04-27 British Cast Iron Res Ass Manufacture of engineering components and of improved grey cast iron therefor
US3392013A (en) * 1966-03-14 1968-07-09 Owens Illinois Inc Cast iron composition and process for making
US4806157A (en) * 1983-06-23 1989-02-21 Subramanian Sundaresa V Process for producing compacted graphite iron castings
US4874576A (en) 1988-01-23 1989-10-17 Metallgesellschaft Aktiengesellschaft Method of producing nodular cast iron
WO2001054844A1 (en) 2000-01-26 2001-08-02 Novacast Ab Gating system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765876A (en) * 1972-11-01 1973-10-16 W Moore Method of making nodular iron castings
EP0041953B1 (en) * 1979-12-19 1984-06-13 Foseco International Limited Production of vermicular graphite cast iron
DE3010623C2 (de) * 1980-03-20 1982-12-02 Metallgesellschaft Ag, 6000 Frankfurt Vorrichtung zum Behandlung von geschmolzenem Gußeisen
CH656147A5 (de) * 1981-03-31 1986-06-13 Fischer Ag Georg Verfahren zur herstellung eines gusseisens mit vermiculargraphit.
NO306169B1 (no) * 1997-12-08 1999-09-27 Elkem Materials Ympemiddel for stöpejern og fremgangsmÕte for fremstilling av ympemiddel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB833486A (en) 1956-05-02 1960-04-27 British Cast Iron Res Ass Manufacture of engineering components and of improved grey cast iron therefor
US3392013A (en) * 1966-03-14 1968-07-09 Owens Illinois Inc Cast iron composition and process for making
US4806157A (en) * 1983-06-23 1989-02-21 Subramanian Sundaresa V Process for producing compacted graphite iron castings
US4874576A (en) 1988-01-23 1989-10-17 Metallgesellschaft Aktiengesellschaft Method of producing nodular cast iron
WO2001054844A1 (en) 2000-01-26 2001-08-02 Novacast Ab Gating system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105785882A (zh) * 2016-05-09 2016-07-20 哈尔滨理工大学 一种球墨铸铁球化孕育处理动态调控方法及系统
CN105785882B (zh) * 2016-05-09 2019-05-14 哈尔滨理工大学 一种球墨铸铁球化孕育处理动态调控方法及系统
EP3519602A4 (en) * 2016-09-29 2020-04-01 Tupy S.A. MIXING CAST IRON ALLOY FOR COMBUSTION ENGINE BLOCK AND HEAD

Also Published As

Publication number Publication date
MX2008007968A (es) 2008-09-26
SE0502817L (sv) 2007-06-21
EP1974062B1 (en) 2013-01-23
US20120090803A1 (en) 2012-04-19
KR20080089577A (ko) 2008-10-07
BRPI0620077A2 (pt) 2011-11-01
CN101341262B (zh) 2010-12-29
SE529445C2 (sv) 2007-08-14
US20090183848A1 (en) 2009-07-23
EP1974062A1 (en) 2008-10-01
CN101341262A (zh) 2009-01-07

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