EP0439244A1 - Verfahren zur Nodularisierung - Google Patents

Verfahren zur Nodularisierung Download PDF

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Publication number
EP0439244A1
EP0439244A1 EP19910300014 EP91300014A EP0439244A1 EP 0439244 A1 EP0439244 A1 EP 0439244A1 EP 19910300014 EP19910300014 EP 19910300014 EP 91300014 A EP91300014 A EP 91300014A EP 0439244 A1 EP0439244 A1 EP 0439244A1
Authority
EP
European Patent Office
Prior art keywords
stage
molten metal
nodularising
agent
mould cavity
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.)
Granted
Application number
EP19910300014
Other languages
English (en)
French (fr)
Other versions
EP0439244B1 (de
Inventor
Geoffrey Mannion
Henry Cecil Canning
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.)
International Meehanite Metal Co Ltd
Original Assignee
International Meehanite Metal Co Ltd
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 International Meehanite Metal Co Ltd filed Critical International Meehanite Metal Co Ltd
Publication of EP0439244A1 publication Critical patent/EP0439244A1/de
Application granted granted Critical
Publication of EP0439244B1 publication Critical patent/EP0439244B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • C22C33/10—Making cast-iron alloys including procedures for adding magnesium

Definitions

  • the present invention relates to a method for the production of nodular iron.
  • Holding nodular cast iron which, may contain, for example, about 0.03% to 0.08% of magnesium leads to the following difficulties.
  • a build up of slag and reaction products can occur especially in the zone adjacent to the filling and pouring spouts and, when fitted, in the inductor channel.
  • Relatively large alloy reaction chambers need to be incorporated in the gating system in order to house the nodularising alloy in quantities ranging, for example, from 0.8% to 1.3% of the casting spray weight which results in a reduction in casting yield of some 5% to 7%.
  • the casting pouring rates need to be carefully controlled to within relatively narrow pre-determined times so as to ensure consistency of nodularisation.
  • the invention provides a method for the production of nodular cast iron in which a nodulariser is introduced into the molten metal to be treated in at least two stages, at least one of the stages taking place prior to the introduction of the molten metal into the mould cavity.
  • the nodularising agent is introduced, in a first stage, to the molten metal prior to its entry into the mould cavity and, in a second stage, to the metal within the mould cavity.
  • the nodularising agent may be contained in the mould cavity itself or in a chamber associated therewith, prior to introduction of the metal or it may be added to the metal stream during its passage into the mould cavity.
  • the method of introducing the nodularising agent at each stage may be any convenient known method of introducing nodularising agents into molten grey cast iron.
  • the nodularising agent is introduced, in a first stage, by the IMCONOD process as described in European Patent No. 0086549 and, in a second stage, by the INMOLD process as described in British Patent No. 1278265.
  • the nodularising agent is placed in a container supported in the base of a covered jacket or funnel and which has an aperture at the top of its peripheral walls, and optionally one or more other apertures in its peripheral walls remote from the funnel exit.
  • the grey molten metal is poured from via a pouring bush over the nodularising agent held in the container wherein the metal reacts with the nodularising agent and the metal containing the agent is allowed to flow through the apertures in the container into an enclosed space around the additive containers subsequently allowing the molten metal to flow into a pouring ladle arranged beneath the additive container.
  • the molten metal may flow in a zig-zag path and during the process contact of the molten metal with the atmosphere is restricted by means of the covered jacket or funnel housing the container.
  • the partially nodularised molten metal is subsequently processed, in the second nodularisation step, by a conventional technique such as the INMOLD process.
  • the moten metal to be treated is introduced into the mould cavity by way of a conventional pouring system which additionally includes one or more intermediate chambers containing a nodularising agent in an amount sufficient to complete conversion of the graphite to nodular or spheroidal form.
  • the intermediate chamber may, for example, be connected directly to a pouring bush by means of which the mould is filled, or it may be connected directly to a sprue used in filling the mould, or to a feeding riser, runner or ingate of the mould or it may be connected to a whirlgate in the gating system.
  • the nodularising agent is introduced, in a first stage, by the "Pourover” or “Overpour” system, a well known technique discussed in the article by Else et al above, and, in, a second stage, by the INMOLD process.
  • the nodularising agent may be any known agent, including magnesium-containing and non-magnesium-containing nodularising agents as known in the art.
  • the proportion of the nodularising agent which is introduced in the first stage is a matter of choice for the Foundryman and will depend, inter alia, on the particular treatment methods employed, the amount of active component e.g. magnesium contained in the nodulariser, the temperature and sulphur levels of the molten metal.
  • a typical range of proportion would be 20%-80%, preferably 60%-70%, referring to a nodulariser containing 4%-6% magnesium. It should be understood however, that the proportion of nodularising agent introduced in the first stage must be sufficient to ensure that a significant degree of partial nodularisation takes place in the first stage.
  • partial nodularisation used herein describes a structure consisting of graphite nodules and/or malformed nodules and/or compacted graphite flakes.
  • the process according to the invention consists of adding the nodulariser in at least two distinct steps, as compared to conventional methods in which the total amount of the magnesium alloy is added to the metal during one operation.
  • the first step of this process is one of partial nodularisation to a significant degree in contradistinction to pre-conditioning where little or no nodularisation takes place because the composition and quantity of additives used for pre-conditioning merely influence nucleation and response to nodularisation.
  • the first step in the processing cycle consists of adding a part of the nodulariser to the molten metal held in either a ladle or furnace in order to effect partial nodularisation.
  • This metal could optionally be held for an extended time in the partially nodularised condition by adding at intervals further small additions of nodulariser. Alternatively the final stage in the processing cycle could proceed without the holding stage.
  • the final stage consists of complete nodularisation of the metal by the further addition of nodulariser/inoculant to the metal stream either within the mould itself, for example by the INMOLD process or added into the metal stream during entry of the metal into the mould cavity.
  • Figures 1 and 2 are schematic representations of two embodiments respectively of an apparatus suitable for carrying out the process according to the invention.
  • Figure 1 represents a combined pour-over and Inmold system.
  • the nodularising agent is introduced, in a first stage, in the alloy chamber of a ladle 1. Molten metal from a furnace is poured over the nodularising agent contained in the alloy chamber of the ladle 1. In a second stage the partially nodularised molten metal is introduced via the ladle 1 into an Inmold system. Nodularising agent is introduced into a chamber adjoining or associated with the mould cavity.
  • Figure 2 represents a combined Imconod and Inmold system.
  • the nodularising agent in the first stage of the process, is contained within an additive container housed within a jacket or funnel 2.
  • Molten metal from a furnace enters the Imconod system via a pouring bush 3 and the partially nodularised molten metal is collected in a ladle 1 and subsequently enters an Inmold system as in the embodiment illustrated in Figure 1.
  • the structure and mechanical properties of the nodular cast iron produced by the multiple stage process were measured using samples taken from two flywheel castings.
  • the combined process whilst using similar amounts of nodulariser when compared to INMOLD, i.e. 1.27% cf 1.37%, offers a definite cost advantage in that the size of the INMOLD reaction chamber is considerably reduced, i.e. from 87 mm. X 63 mm. X 74 mm. high to 45 mm. X 45 mm. X 64mm high.
  • the significant reduction in area means that less space is taken up on the pattern plate thus minimising one of the disadvantages of the process.
  • the division of the nodularising addition is also advantageous in the holding of metal containing magnesium after the first stage of the nodularisation process.
  • An important advantage of the process according to the invention is that it permits the use of a reaction chamber of much simpler design and of an extremely small surface area.
  • reaction chamber with a small surface area offers practical and economic advantages to the user in that a relatively small amount of space is taken up on the pattern plate.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP91300014A 1990-01-16 1991-01-02 Verfahren zur Nodularisierung Expired - Lifetime EP0439244B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9000899 1990-01-16
GB909000899A GB9000899D0 (en) 1990-01-16 1990-01-16 Nodularlising method

Publications (2)

Publication Number Publication Date
EP0439244A1 true EP0439244A1 (de) 1991-07-31
EP0439244B1 EP0439244B1 (de) 1997-05-02

Family

ID=10669338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91300014A Expired - Lifetime EP0439244B1 (de) 1990-01-16 1991-01-02 Verfahren zur Nodularisierung

Country Status (5)

Country Link
EP (1) EP0439244B1 (de)
DE (1) DE69125860T2 (de)
DK (1) DK0439244T3 (de)
ES (1) ES2103772T3 (de)
GB (1) GB9000899D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629709A1 (de) * 1993-05-18 1994-12-21 Grafit-Verwertung Richard Anton Kg Verfahren und Impfmittel zur Herstellung von Gusseisen
CN114074183A (zh) * 2021-11-29 2022-02-22 国铭铸管股份有限公司 一种减少球墨铸管表皮内部缺陷的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1278265A (en) * 1968-07-17 1972-06-21 Materials & Methods Ltd Improved process for the manufacture of nodular cast iron
FR2150329A1 (de) * 1971-08-24 1973-04-06 Sulzer Ag
DE2937321A1 (de) * 1979-02-16 1980-08-21 Inst Cercetari Stiintifice Verfahren zur herstellung von gusseisen mit vermicullargraphit mittels doppelmodifizierung
EP0086549A1 (de) * 1982-01-20 1983-08-24 The International Meehanite Metal Company Limited Vorrichtung und Verfahren zum Behandeln von Metallschmelzen
EP0325810A1 (de) * 1988-01-23 1989-08-02 SKW Trostberg Aktiengesellschaft Verfahren zur Herstellung von Gusseisen mit Kugelgraphit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1278265A (en) * 1968-07-17 1972-06-21 Materials & Methods Ltd Improved process for the manufacture of nodular cast iron
FR2150329A1 (de) * 1971-08-24 1973-04-06 Sulzer Ag
DE2937321A1 (de) * 1979-02-16 1980-08-21 Inst Cercetari Stiintifice Verfahren zur herstellung von gusseisen mit vermicullargraphit mittels doppelmodifizierung
EP0086549A1 (de) * 1982-01-20 1983-08-24 The International Meehanite Metal Company Limited Vorrichtung und Verfahren zum Behandeln von Metallschmelzen
EP0325810A1 (de) * 1988-01-23 1989-08-02 SKW Trostberg Aktiengesellschaft Verfahren zur Herstellung von Gusseisen mit Kugelgraphit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629709A1 (de) * 1993-05-18 1994-12-21 Grafit-Verwertung Richard Anton Kg Verfahren und Impfmittel zur Herstellung von Gusseisen
CN114074183A (zh) * 2021-11-29 2022-02-22 国铭铸管股份有限公司 一种减少球墨铸管表皮内部缺陷的方法

Also Published As

Publication number Publication date
ES2103772T3 (es) 1997-10-01
DE69125860D1 (de) 1997-06-05
DE69125860T2 (de) 1997-12-04
DK0439244T3 (da) 1997-11-03
EP0439244B1 (de) 1997-05-02
GB9000899D0 (en) 1990-03-14

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