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US3802680A - Apparatus to make cast iron with spheroidal graphite - Google Patents

Apparatus to make cast iron with spheroidal graphite Download PDF

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Publication number
US3802680A
US3802680A US00236743A US23674372A US3802680A US 3802680 A US3802680 A US 3802680A US 00236743 A US00236743 A US 00236743A US 23674372 A US23674372 A US 23674372A US 3802680 A US3802680 A US 3802680A
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US
United States
Prior art keywords
magnesium
plug
container
iron
covering
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.)
Expired - Lifetime
Application number
US00236743A
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English (en)
Inventor
G Anders
S Wagle
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.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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Filing date
Publication date
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
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Publication of US3802680A publication Critical patent/US3802680A/en
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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
    • C21C1/10—Making spheroidal graphite cast-iron

Definitions

  • the plug-like body can extend beyond the protective covering layer and, itself, be cov ered with a protective sheath of refractory material which can'be lifted off from the body when the exposure is desired.
  • the lift-off mechanism can be used to introduce the plug-like body by providing therein a mechanical or magnetic. holding arrangement.
  • the present invention relates to to an apparatus to make cast iron with spheroidal graphite, by treating the cast iron, when liquid, with metallic magnesium or a magnesium alloy.
  • a protective layer of calcium carbide it has also been proposed to introduce gas under pressure through aporous plug from the outside of the container, in order to break up this protective layer and permit access of the molten iron to the magnesium. Destruction of the protective layer of calcium carbide by mechanical means or by pressure forces permits an exact point of time at which the reaction, or the treatment between the magnesium and the cast iron will start. Still, undesirable differences in the reactive process may arise since the contact area between the molten cast iron and the calcium carbide is subject to great variation, and cannot be controlled beforehand.
  • a protective layer such as calcium carbide (CaC) covers a layer of magnesium.
  • CaC calcium carbide
  • Embedded in the calcium carbide is a cylindrical, or prismatic plug-like body made of iron, or iron alloy, extending therefrom or at least having an exposed face. This plug-like body is applied against the magnesium so that, upon contacting of the body with the molten iron, this body itselfwill melt and the reaction between the liquid iron and the magnesium, or the magnesium alloy can commence.
  • the contact area between the liquid iron and the magnesium is, of course, given by the cross-sectional area of this body.
  • the delay time between introduction of the molten iron and start of the reaction can be accurately controlled if a refractorysheath is provided which covers the plug-like body, or the portion thereof extending be-' yond the protective layer, the sheath being lifted off after the liquid iron has been filled into the container and when the reaction is .to start.
  • the plug-like body preferably is held by a paraIlelogram-rod-link arrangement and can, additionally, be provided with means to releasably secure the plug-like body thereto so it can be used as an insertion element to insert the plug-like body into the container and against the magnesium layer, prior to the start of the process steps.
  • FIG. 1 is a schematic longitudinal section through a container illustrating the method and the apparatus, in one embodiment
  • FIG. 2 is a view similar to FIG. 1., illustrating a modified embodiment
  • FIG. 3 is a fragmentary view illustrating the lower part of the sheath and the plug-like body.
  • Acontainer l which may be a ladle, has a depression 2 formed in the bottom thereof.
  • the container 1 has a plug 3 therein which consists of a core 8 with a ceramic, refractory sheath 13.
  • the plug 3 is secured by means of a parallel-linkage arrangement 9.
  • Magnesium, or magnesium alloy 5 is introduced into the depression 2. It is covered by a protective covering layer 6, for ex; ample granular calcium carbide.
  • Liquid iron 10 is introduced into container 1 at an inlet 7, in such a manner that the protective covering is not destroyed. This is well known in the art.
  • Magnesium, or a magnesium alloy such as magnesium silicate or magnesium ferrosilicate is introduced into the depression 2 in the bottom of container 1.
  • the delay time for the reaction that is, the time between start of introduction of molten iron until the reaction begins, can be predetermined and set within certain limits.
  • Providing a plug 3 which covers the top surface of body 4 substantially increases the time until a reaction with the magnesium will start.
  • Plug 3 should at least cover the top surface of the body 4, but may extend also over the protective layer 6 (see FIG. 1). If a plug 3 is used, the plug is lifted by means of its lifting mechanism 9, permitting free access of the molten iron 10 to the plug-like body 4, which will melt and, upon melting, permit exposure of the magnesium or magnesium alloy 5 with the molten iron.
  • the container 21 is formed with a partition wall 22 at the bottom thereof, to provide a separated portion, or subsidiary vessel into which magnesium or magnesium alloy 25 can be introduced.
  • the plug-like body 24, preferably a cylinder or a prism, is so placed within the magnesium that the upper portion of the body 24 extends somewhat over and beyond the protective layer 26.
  • a plug 23 is formed of a core 28 with a refractory covering 30, suspended by a parallel link suspension 29.
  • the plug 23 is formed with a recess 27 at its bottom which is big enough in order to accept the portion of body 24 extending beyond protective layer 26. Molten iron is introduced at an inlet point 31. 9
  • the magnesium 25 and body 24 are introduced into the auxiliary compartment; a cover layer 26 is placed thereover. Thereafter, the plug 23 is lowered until the recess 27 completely covers the projecting portion of the body 24. This recess 27 can be so formed that the plug 23 extends down to the magnesium 25.
  • Molten iron 32 is introduced through inlet 31. The treatment commences upon lifting of plug 23. After the time gap determined by melting or dissolution of body 24, reaction between the iron melt 32 and the magnesium will start.
  • the body 34 can be introduced into the vessel by means of the plug holder.
  • a holding device which can be mechanical or magnetic for the body 34 is provided in the interior of plug 39.
  • a magnet 36 is located in the interior of the plug 39, protected against influence of the iron melt 32 by a ceramic protective wall 35.
  • a rod 38 is guided in the interior of plug 39 to move the magnet to bring it close to, or lift it off from plug 34, so that it can be rendered effective or ineffective.
  • the entire arrangement is located within the interior of the plug 39 and is used in order to hold the body 34 after its introduction into the recess 37, until the magnesium 25 and the protective layer 26 have been introduced in the auxiliary compartment.
  • the magnet 36 is disabled from continuing to hold the plug 34 by lifting of rod 38.
  • plug 39 can be moved or lifted as desired by the process, as described in connection with plug 23.
  • the iron or iron alloy body 34 can be held within the recess 37 of plug 39 by a slight interference fit, the recess 37 tapering slightly upwardly, so that, after placement of the body 34, pushing on rod 38 will release the body 34 from holding contact with plug 39.
  • This arrangement can be combined with a magnet (FIG. 3), where the interference fit is not shown for purposes of simplicity in the drawing.
  • the begin of the reaction, as well as the reaction process itself, can be completely controlled within wide and accurate limits so that the resulting cast iron will be of uniform and predetermined quality and characteristics.
  • Apparatus to make cast iron with spheroidal graphite comprising a container (1);
  • a plug-like body (4) of iron or iron alloy located in contact with said magnesium or magnesium alloy and extending through the protective layer (6) to be exposed at the outer face thereof, said body, upon introduction of molten iron and contact of its exposed portion with the molten iron, melting, and permitting controlled contact of the molten iron with the magnesium;
  • a covering sheath (3, 13; 23; 39) movably located to shield the exposed portion of said plug-like body from contact with the molten iron;
  • Apparatus according to claim 1 comprising means in the covering sheath removably holding the plug-like body to permit use of the movable sheath as a holding element for the body.
  • Apparatus to make cast iron with spheroidal graphite comprising 7' a container (1);
  • a plug-like body (4) of iron or iron alloy located in contact with said magnesium or magnesium alloy and extending through the protective layer (6) to be exposed at the outer face thereof, said body, upon introduction of molten iron and contact of its exposed portion with the molten iron, melting, and permitting controlled contact of the molten iron with the magnesium;
  • the container is formed with a compartment at the bottom thereof, the magnesium being located in said compartment, and a movable plug of refractory material is provided movable in line with said container between covering and uncovering position with respect to said plug-like body.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US00236743A 1971-03-31 1972-03-21 Apparatus to make cast iron with spheroidal graphite Expired - Lifetime US3802680A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH467771A CH549095A (de) 1971-03-31 1971-03-31 Verfahren und vorrichtung zur erzeugung von gusseisen mit kugelgraphit.

Publications (1)

Publication Number Publication Date
US3802680A true US3802680A (en) 1974-04-09

Family

ID=4280544

Family Applications (1)

Application Number Title Priority Date Filing Date
US00236743A Expired - Lifetime US3802680A (en) 1971-03-31 1972-03-21 Apparatus to make cast iron with spheroidal graphite

Country Status (5)

Country Link
US (1) US3802680A (de)
CH (1) CH549095A (de)
DE (1) DE2212575B2 (de)
FR (1) FR2132233B1 (de)
GB (1) GB1390842A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955974A (en) * 1971-05-18 1976-05-11 Georg Fischer Aktiengesellschaft Apparatus and method for treating a metal melt with a vaporizable substance
US4199353A (en) * 1977-01-18 1980-04-22 Canron Inc. Molten metal treatment
US4230490A (en) * 1977-05-26 1980-10-28 Werner Kessl Process for producing cast iron
US4233064A (en) * 1978-09-13 1980-11-11 Dunn Jr Edward J Method of scavenging steel
US4341553A (en) * 1979-08-09 1982-07-27 Gesellschaft Fur Huttenwerksanlagen Mbh Method of, and cupola furnace for, the introduction of treatment agents into cupola iron melts
US4391636A (en) * 1981-12-16 1983-07-05 Wintec Company Method of and apparatus for the production of nodular (ductile) cast iron
US4544407A (en) * 1981-03-03 1985-10-01 George Fischer Aktiengesellschaft Process for producing cast iron castings with a vermicular graphite structure
US5215709A (en) * 1991-04-05 1993-06-01 Tubi Ghisa S.P.A. Method and device for treatment of metal baths by means of a material having a high gas vapor potential
US20120152060A1 (en) * 2009-05-06 2012-06-21 Emmanuel Berthelet Treatment ladle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776206A (en) * 1953-08-01 1957-01-01 Int Nickel Co Method and apparatus for introducing low-boiling substances into molten metal
CA692765A (en) * 1964-08-18 M. Mcanulty Gerald Nodular iron production

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR593494A (fr) * 1924-02-20 1925-08-24 Perfectionnements dans le montage des conducteurs électriques au moyen de boîtes de dérivation
FR1057905A (fr) * 1950-12-15 1954-03-11 Procédé et dispositif pour allier des métaux

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA692765A (en) * 1964-08-18 M. Mcanulty Gerald Nodular iron production
US2776206A (en) * 1953-08-01 1957-01-01 Int Nickel Co Method and apparatus for introducing low-boiling substances into molten metal

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955974A (en) * 1971-05-18 1976-05-11 Georg Fischer Aktiengesellschaft Apparatus and method for treating a metal melt with a vaporizable substance
US4199353A (en) * 1977-01-18 1980-04-22 Canron Inc. Molten metal treatment
US4230490A (en) * 1977-05-26 1980-10-28 Werner Kessl Process for producing cast iron
US4233064A (en) * 1978-09-13 1980-11-11 Dunn Jr Edward J Method of scavenging steel
US4341553A (en) * 1979-08-09 1982-07-27 Gesellschaft Fur Huttenwerksanlagen Mbh Method of, and cupola furnace for, the introduction of treatment agents into cupola iron melts
US4544407A (en) * 1981-03-03 1985-10-01 George Fischer Aktiengesellschaft Process for producing cast iron castings with a vermicular graphite structure
US4391636A (en) * 1981-12-16 1983-07-05 Wintec Company Method of and apparatus for the production of nodular (ductile) cast iron
US5215709A (en) * 1991-04-05 1993-06-01 Tubi Ghisa S.P.A. Method and device for treatment of metal baths by means of a material having a high gas vapor potential
US20120152060A1 (en) * 2009-05-06 2012-06-21 Emmanuel Berthelet Treatment ladle

Also Published As

Publication number Publication date
DE2212575B2 (de) 1973-05-24
DE2212575A1 (de) 1972-11-09
GB1390842A (en) 1975-04-16
FR2132233A1 (de) 1972-11-17
FR2132233B1 (de) 1976-08-06
CH549095A (de) 1974-05-15

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