US2872179A - Device for use in making nodular cast iron - Google Patents

Device for use in making nodular cast iron Download PDF

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Publication number
US2872179A
US2872179A US635725A US63572557A US2872179A US 2872179 A US2872179 A US 2872179A US 635725 A US635725 A US 635725A US 63572557 A US63572557 A US 63572557A US 2872179 A US2872179 A US 2872179A
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Prior art keywords
magnesium
tube
cast iron
nodular cast
billet
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Expired - Lifetime
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US635725A
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Philip A Fisher
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Magnesium Elektron Ltd
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Magnesium Elektron Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00Refining of pig-iron; Cast iron
    • C21C1/10Making spheroidal graphite cast-iron
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12222Shaped configuration for melting [e.g., package, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12556Organic component
    • Y10T428/12569Synthetic resin
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12729Group IIA metal-base component
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771Transition metal-base component
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771Transition metal-base component
    • Y10T428/12861Group VIII or IB metal-base component
    • Y10T428/12951Fe-base component

Description

Feb. 3, 1959 P. A. FISHER 2,872,179

DEVICE FOR USE IN MAKING NODULAR CAST IRON Filed Jan. 25, 1957 wvvvvvvv Inventor DEVICE FQR USE IN MAKING NODULAR CAST IRON Philip A. Fisher, Manchester, England, assignor t Magnesium Elektron Limited, Manchester, England Application January 23, 1957, Serial No. 635,725

Claims priority, application Great Britain January 23, 1956 3 Claims. (Cl. 26634) This invention relates to the introduction of a volatilisable metal into molten iron or steel especially for the purpose of producing nodular cast iron.

The production of nodular cast iron, has until fairly recently, been mainly carried out by treatment with magnesium in the form of a nickel-magnesium alloy. This is added to the normal ladles, the dilution with nickel being required to enable the magnesium to sink to the bottom of the ladle where it volatilises and passes through the iron. This process is expensive since the nickel content of the hardener is usually 70-80% and the magnesium efiiciency (i. e. the portion of the magnesium which is used effectively) may be only about 30%, the balance being mainly lost by oxidation of magnesium vapour which is ejected from the molten iron.

Recently a number of devices have been developed to permit the use of pure magnesium and one of these is known as a pressure ladle apparatus. In this device the magnesium is plunged below the surface of the molten iron which is held in a sealed ladle, thus preventing the loss of magnesium to the atmosphere. Magnesium recoveries are about 40-60%, the major saving in cost being avoidance of nickel consumption. In its original form the device includes a specially shaped ladle above which is suspended a refractory coated plunger incorporating a sealing plate and a heavy weight to maintain the pressure generated by the vapourised magnesium. At the bottom of the plunger is attached a steel canister into which is packed loose pieces of pure magnesium. In operation the ladle is filled with molten iron and the plunger lowered into this until the sealing plate closes the top of the ladle. For each operation the joint between sealing plate and ladle has to be specially prepared using some form of sealing compound, and some little time, say up to 30 seconds, may be required to accomplish this. It is therefore essential that the magnesium should not commence to volatilise before this joint is completed.

As a further development, a solid magnesium billet containing a projecting steel rod has been used. This billet is first coated with refractory to provide the necessary delay before volatilisation and the billet is then attached to the plunger by threading the steel rod into a screw at the end of the plunger.

According to the present invention a method of producing nodular cast iron comprises introducing a readily volatilisable metal into molten iron by means of a plunger comprising a billet of metal consisting of or containing the volatilisable metal having its top and sides sheathed in iron or steel, the plunger being mounted on a holder. The base of the billet may be coated with reatent O 2,872,179 Patented Feb. 3, 1959 fractory. The billet may be pure magnesium or an alloy e. g. a magnesium alloy containing aluminium or rare earth metals, or may be rare earth metals alone. Additional means may be provided to hold the billet in position within the steel sheath, to prevent solid metal from leaving the sheath during the period in which this is immersed in the iron.

A plunger made in accordance with the invention is illustrated by way of example in the accompanying diagrammatic drawing wherein 10 shows a mild steel tube having one end closed by a plate 11 welded thereon. The plate 11 has a stud 13 welded to it. A threaded bolt 14 passes through the stud 13 and is disposed in the tube and carries a washer 15 in the tube. The volatilisable metal 12 is cast into the tube around the bolt 14 and washer 15. The metal 12 is thus in the form of a billet and is sheathed at its sides by the tube 10 and at its top by the plate 11. The unsheathed lower end 16 of the billet may be coated with a refractory material.

The washer 15 serves as a means of anchoring the magnesium and other anchorage means may be provided attached to the stud and/or to the sheathing.

The end 16 can if desired be also covered by a welded on steel plate.

The upper end of the stud 16 is threaded for attach ment to a rod or handle.

The invention offers the following advantages:

(1) The magnesium or the like tends to volatilise from the open end only whereby the magnesium vapour travels by the longest path through the cast iron, thereby giving the greatest possibility of satisfactory reaction.

(2) The exposed area of magnesium, which may be coated with refractory, is minimised, whereby the device is safer in operation than the use of a billet in which the whole surface is so coated.

(3) In the event of premature volatilisation any explosion which might result is directed downwards thus minimising the risk of accident.

The refractory may be applied for example by coating the exposed magnesium with a synthetic resin and dipping it in sand.

I claim:

1. A device for use in making nodular cast iron, comprising a plunger in the form of a tube of ferrous metal having its lower end open and its upper end enclosed, said tube containing a billet of solid metal readily volatilizable in molten iron and suitable for treatment of iron, the tube having a rod extending through said closed upper end, the upper end of said rod being attached to a holder, the lower portion of said rod having means, rigidly attached thereto, embedded in said billet of solid metal to anchor the same within said tube.

2. A device as set forth in claim 1, wherein said solid metal is magnesium.

3. A device as set forth in claim 1 wherein the solid metal adjacent the lower end of the tube is coated with a refractory material.

References Cited in the file of this patent UNITED STATES PATENTS 1,896,201 Sterner-Rainer Feb. 7, 1933 2,485,760 Millis et al. Oct. 25, 1949 2,662,008 Stone Dec. 8, 1953 2,726,152 Eash Dec. 6, 1955

Claims (1)

1. A DEVICE FOR USE IN MAKING NODULAR CAST IRON, COMPRISING A PLONGER IN THE FORM OF A TUBE OF FERROUS METAL HAVING ITS LOWER END OPEN AND ITS UPPER END ENCLOSED, SAID TUBE CONTAINING A BRILLET OF SOLID METAL READILY VOLATILIZABLE IN MOLTEN IRON AND SUITABLE FOR TREATMENT OF IRON, THE TUBE HAVING A ROD EXTENDING THROUGH SAID CLOSED UPPER END, THE UPPER END OF SAID ROD BEING ATTACHED TO A HOLDER, THE LOWER PORTION OF SAID ROD HAVING MEANS, IGIDLY ATTACHED THERETO, EMBEDDED IN SAID BILLET OF SOLID METAL TO ANCHOR THE SAME WITHIN SAID TUBE.
US635725A 1956-01-23 1957-01-23 Device for use in making nodular cast iron Expired - Lifetime US2872179A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017267A (en) * 1959-07-28 1962-01-16 Ford Motor Co Nodular iron manufacture
US3809380A (en) * 1973-05-07 1974-05-07 Metallurg Exoproducts Corp Apparatus for ladle additions
US3854939A (en) * 1972-04-17 1974-12-17 American Magnesium Co Method for inoculating molten metal with an inoculating material
US3921700A (en) * 1974-07-15 1975-11-25 Caterpillar Tractor Co Composite metal article containing additive agents and method of adding same to molten metal
US4022444A (en) * 1975-08-25 1977-05-10 Reactive Metals & Alloys Corporation Apparatus for adding mischmetal to molten steel
US4047556A (en) * 1974-05-01 1977-09-13 Nippon Steel Corporation Continuous casting method
US4162349A (en) * 1977-05-24 1979-07-24 United Technologies Corporation Fabrication of Co-Cr-Al-Y feed stock
US4204666A (en) * 1977-12-02 1980-05-27 Ford Motor Company In situ furnace metal desulfurization/nodularization by high purity magnesium
US4245691A (en) * 1977-12-02 1981-01-20 Ford Motor Company In situ furnace metal desulfurization/nodularization by high purity magnesium
EP0424604A1 (en) * 1989-10-27 1991-05-02 MINKON SAMPLER-TECHNIK GmbH Plunger bell for treatment of melts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1896201A (en) * 1931-01-17 1933-02-07 American Lurgi Corp Process of separating oxides and gases from molten aluminum and aluminium alloys
US2485760A (en) * 1947-03-22 1949-10-25 Int Nickel Co Cast ferrous alloy
US2662008A (en) * 1950-08-17 1953-12-08 United States Steel Corp Device for progressively releasing a reagent in a bath of molten metal
US2726152A (en) * 1953-02-11 1955-12-06 Int Nickel Co Addition agent and method for treating cast iron

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1896201A (en) * 1931-01-17 1933-02-07 American Lurgi Corp Process of separating oxides and gases from molten aluminum and aluminium alloys
US2485760A (en) * 1947-03-22 1949-10-25 Int Nickel Co Cast ferrous alloy
US2662008A (en) * 1950-08-17 1953-12-08 United States Steel Corp Device for progressively releasing a reagent in a bath of molten metal
US2726152A (en) * 1953-02-11 1955-12-06 Int Nickel Co Addition agent and method for treating cast iron

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017267A (en) * 1959-07-28 1962-01-16 Ford Motor Co Nodular iron manufacture
US3854939A (en) * 1972-04-17 1974-12-17 American Magnesium Co Method for inoculating molten metal with an inoculating material
US3809380A (en) * 1973-05-07 1974-05-07 Metallurg Exoproducts Corp Apparatus for ladle additions
US4047556A (en) * 1974-05-01 1977-09-13 Nippon Steel Corporation Continuous casting method
US3921700A (en) * 1974-07-15 1975-11-25 Caterpillar Tractor Co Composite metal article containing additive agents and method of adding same to molten metal
US4022444A (en) * 1975-08-25 1977-05-10 Reactive Metals & Alloys Corporation Apparatus for adding mischmetal to molten steel
US4162349A (en) * 1977-05-24 1979-07-24 United Technologies Corporation Fabrication of Co-Cr-Al-Y feed stock
US4204666A (en) * 1977-12-02 1980-05-27 Ford Motor Company In situ furnace metal desulfurization/nodularization by high purity magnesium
US4245691A (en) * 1977-12-02 1981-01-20 Ford Motor Company In situ furnace metal desulfurization/nodularization by high purity magnesium
EP0424604A1 (en) * 1989-10-27 1991-05-02 MINKON SAMPLER-TECHNIK GmbH Plunger bell for treatment of melts

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