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EP1974062B1 - Procede de fabrication de fer graphitique compacte - Google Patents

Procede de fabrication de fer graphitique compacte Download PDF

Info

Publication number
EP1974062B1
EP1974062B1 EP06835848A EP06835848A EP1974062B1 EP 1974062 B1 EP1974062 B1 EP 1974062B1 EP 06835848 A EP06835848 A EP 06835848A EP 06835848 A EP06835848 A EP 06835848A EP 1974062 B1 EP1974062 B1 EP 1974062B1
Authority
EP
European Patent Office
Prior art keywords
cerium
magnesium
iron
mould
production
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.)
Not-in-force
Application number
EP06835848A
Other languages
German (de)
English (en)
Other versions
EP1974062A1 (fr
Inventor
Rudolf Sillen
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.)
NovaCast Technologies AB
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
Publication of EP1974062A1 publication Critical patent/EP1974062A1/fr
Application granted granted Critical
Publication of EP1974062B1 publication Critical patent/EP1974062B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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 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 A1 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 dissolves the alloy. The treated metal then fills the casting cavity. The problems with fading of magnesium are eliminated when using this process.
  • Another example is shown in US-4,874,576 which reveals a two-step process where magnesium is added in the mould.
  • 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 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/cm3) it does not show any fading effect.
  • cerium By adding cerium to the base iron it can be properly dissolved 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:
  • 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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Claims (1)

  1. Procédé de production de fer graphitique compacté en utilisant une addition dans le moule d'un alliage contenant du magnésium, caractérisé par un préchauffage du fer de base dans une poche de coulée ou dans un four avec un alliage contenant du cérium, la quantité de cérium étant ajustée en fonction de la teneur en soufre dans le fer de base à un pourcentage minimum de taux de cérium dans le fer de base estimé comme étant ((% S - 0,006)*2,9 + 0,01), où S est la teneur en soufre dans le fer avant l'addition du cérium, et de préférence un taux de cérium compris entre 0,008 et 0,025 %, et en effectuant un traitement de formation de structure dans une chambre réactionnelle dans le moule en utilisant un alliage de ferrosilicium contenant de 3 à 6 % de magnésium et de 0,5 à 1,5 % de lanthane.
EP06835848A 2005-12-20 2006-12-14 Procede de fabrication de fer graphitique compacte Not-in-force EP1974062B1 (fr)

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
PCT/SE2006/001424 WO2007073280A1 (fr) 2005-12-20 2006-12-14 Procede de fabrication de fer graphitique compacte

Publications (2)

Publication Number Publication Date
EP1974062A1 EP1974062A1 (fr) 2008-10-01
EP1974062B1 true EP1974062B1 (fr) 2013-01-23

Family

ID=38188913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06835848A Not-in-force EP1974062B1 (fr) 2005-12-20 2006-12-14 Procede de fabrication de fer graphitique compacte

Country Status (8)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015034062A1 (fr) * 2013-09-06 2015-03-12 東芝機械株式会社 Procédé de sphéroïdisation de métal en fusion de fonte à graphite sphéroïdal
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
ES2901405T3 (es) * 2016-09-12 2022-03-22 Snam Alloys Pvt Ltd Un proceso sin magnesio para producir hierro de grafito compacto (HGC)
BR102016022690B1 (pt) * 2016-09-29 2022-02-08 Tupy S.A. Liga de ferro fundido vermicular para bloco e cabeçote de motor a combustão interna
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

Family Cites Families (10)

* 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
US3765876A (en) * 1972-11-01 1973-10-16 W Moore Method of making nodular iron castings
BR8008987A (pt) * 1979-12-19 1981-10-20 Foseco Int Producao de ferro fundido de grafita vermicular
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.
US4806157A (en) * 1983-06-23 1989-02-21 Subramanian Sundaresa V Process for producing compacted graphite iron castings
DE3801917A1 (de) * 1988-01-23 1989-08-03 Metallgesellschaft Ag Verfahren zur herstellung von gusseisen mit kugelgraphit
NO306169B1 (no) * 1997-12-08 1999-09-27 Elkem Materials Ympemiddel for stöpejern og fremgangsmÕte for fremstilling av ympemiddel
SE518344C2 (sv) 2000-01-26 2002-09-24 Novacast Ab Ingjutsystem

Also Published As

Publication number Publication date
CN101341262B (zh) 2010-12-29
EP1974062A1 (fr) 2008-10-01
MX2008007968A (es) 2008-09-26
CN101341262A (zh) 2009-01-07
BRPI0620077A2 (pt) 2011-11-01
SE0502817L (sv) 2007-06-21
SE529445C2 (sv) 2007-08-14
US20090183848A1 (en) 2009-07-23
US20120090803A1 (en) 2012-04-19
KR20080089577A (ko) 2008-10-07
WO2007073280A1 (fr) 2007-06-28

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