US3113019A - Nodular iron production - Google Patents

Nodular iron production Download PDF

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Publication number
US3113019A
US3113019A US188575A US18857562A US3113019A US 3113019 A US3113019 A US 3113019A US 188575 A US188575 A US 188575A US 18857562 A US18857562 A US 18857562A US 3113019 A US3113019 A US 3113019A
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US
United States
Prior art keywords
silicon
ferro
ladle
molten metal
nodular iron
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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
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US188575A
Inventor
Arthur A Adams
John J Arvai
Lester J Bartson
Clarence A Dudzinski
Harold C Grant
Gerald M Mcanulty
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Ford Motor Co
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Ford Motor Co
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Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Priority to US188575A priority Critical patent/US3113019A/en
Application granted granted Critical
Publication of US3113019A publication Critical patent/US3113019A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21C1/08—Manufacture of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C35/00—Master alloys for iron or steel

Definitions

  • This improved nodular iron is prepared from a stock of molten metal having the following analysis:
  • This alloy is maintained molten and at a temperature of approximately 2650" F. After appropriate inoculants have been added the percentage of silicon will have increased to between 2.80% and 3.10% and the metal will contain sufficient magnesium to render the structure nodular as cast.
  • This alloy is conventionally inoculated and handled in ladles containing about 2000 pounds of molten metal.
  • the ladle is preheated and employed to contain the original inoculants.
  • These original inoculants comprise 15 pounds of a magnesium containing ferro-silicon containing between 5 and 7% magnesium, about 47% silicon and the remainder, iron.
  • this inoculant there is added to the ladle 10 pounds of a 75% ferro-silicon.
  • the magnesium ferro-silicon and the 75% ferro-silicon is protected initially from the molten metal by covering these inoculants with 30 pounds of steel punchings.
  • the ladle so prepared is brought to the furnace containing the molten stock metal and in the course of 25 or 30 seconds, 800 to 1000 pounds of molten metal stock is added to the ladle. This fills the ladle approximately half full and initiates the action of the added inoculants upon the stock.
  • the addition of the final inoculant of 3,113,019 Patented Dec. 3, 1963 "ice 10 pounds of ferroasilicon is made. This 10 pounds of 75 ferro-silicon is added as a granular product to the stream of molten stock metal as it flows from the furnace to the ladle. The rate of addition of this material is adjusted so that the addition requires approximately the same time as is required to fill the ladle with molten stock.
  • the ladle so prepared is then poured into castings at about 2550 F.
  • Molten nodular iron so prepared is now commercially cast into engine rocker arms and has produced rocker arms having a consistently superior structure and ease of machining.
  • the process for the production of uniform and machineable nodular iron castings comprising preparing a stock of molten metal suitable for the production of nodular iron when inoculated with nodularizing agents, placing in a ladle a quantity of ferro-silicon and a quantity of magnesium bearing ferro-silicon, covering the magnesium bearing ferro-silicon and the ferro-silicon with a protecting layer of cold metallic ferrous material, filling the ladle partially with molten metal, initiating further addition of ferro-silicon to the ladle and continuing to add such ferro-silicon and molten metal simultaneously until the ladle is filled.
  • the process for the production of uniform and machineable nodular iron castings comprising preparing a stock of molten metal suitable for the production of nodular iron when inoculated with nodularizing agents, placing in a ladle a quantity of ferro-silicon and a quantity of magnesium bearing ferro-silicon, covering the magnesium bearing term-silicon and the term-silicon with a protecting layer of cold metallic ferrous material, filling the ladle approximately half full of molten metal, initiating further additions of ferro-silicon to the ladle and continuing to add such ferro-silicon and molten metal simultaneously until the ladle is filled.

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

Description

United States Patent This invention is concerned with a process for the production of nodular iron castings which are distinguished by the presence of small graphite nodules, a tight structure and the absence of hard spots in castings.
This improved nodular iron is prepared from a stock of molten metal having the following analysis:
Percent Oarbon 3.80-3.90 Silicon 2.00-2.30 Manganese 0.60-0.90 Copper Less than 0.15 Chromium -1 Less than 0.40
This alloy is maintained molten and at a temperature of approximately 2650" F. After appropriate inoculants have been added the percentage of silicon will have increased to between 2.80% and 3.10% and the metal will contain sufficient magnesium to render the structure nodular as cast.
This alloy is conventionally inoculated and handled in ladles containing about 2000 pounds of molten metal. The ladle is preheated and employed to contain the original inoculants. These original inoculants comprise 15 pounds of a magnesium containing ferro-silicon containing between 5 and 7% magnesium, about 47% silicon and the remainder, iron. Along with this inoculant, there is added to the ladle 10 pounds of a 75% ferro-silicon. The magnesium ferro-silicon and the 75% ferro-silicon is protected initially from the molten metal by covering these inoculants with 30 pounds of steel punchings.
The ladle so prepared is brought to the furnace containing the molten stock metal and in the course of 25 or 30 seconds, 800 to 1000 pounds of molten metal stock is added to the ladle. This fills the ladle approximately half full and initiates the action of the added inoculants upon the stock. When the ladle has become approximately half full, the addition of the final inoculant of 3,113,019 Patented Dec. 3, 1963 "ice 10 pounds of ferroasilicon is made. This 10 pounds of 75 ferro-silicon is added as a granular product to the stream of molten stock metal as it flows from the furnace to the ladle. The rate of addition of this material is adjusted so that the addition requires approximately the same time as is required to fill the ladle with molten stock. The ladle so prepared is then poured into castings at about 2550 F.
Molten nodular iron so prepared is now commercially cast into engine rocker arms and has produced rocker arms having a consistently superior structure and ease of machining.
We claim as our invention:
1. The process for the production of uniform and machineable nodular iron castings comprising preparing a stock of molten metal suitable for the production of nodular iron when inoculated with nodularizing agents, placing in a ladle a quantity of ferro-silicon and a quantity of magnesium bearing ferro-silicon, covering the magnesium bearing ferro-silicon and the ferro-silicon with a protecting layer of cold metallic ferrous material, filling the ladle partially with molten metal, initiating further addition of ferro-silicon to the ladle and continuing to add such ferro-silicon and molten metal simultaneously until the ladle is filled.
2. The process for the production of uniform and machineable nodular iron castings comprising preparing a stock of molten metal suitable for the production of nodular iron when inoculated with nodularizing agents, placing in a ladle a quantity of ferro-silicon and a quantity of magnesium bearing ferro-silicon, covering the magnesium bearing term-silicon and the term-silicon with a protecting layer of cold metallic ferrous material, filling the ladle approximately half full of molten metal, initiating further additions of ferro-silicon to the ladle and continuing to add such ferro-silicon and molten metal simultaneously until the ladle is filled.
References Cited in the file of this patent UNITED STATES PATENTS 2,675,308 Millis et al. Apr. 13, 1954 2,749,238 Millis et a1. June 5, 1956 2,750,284 Ihrig June 12, 1956 3,017,267 Bartson et al Ian. 16, 1962

Claims (1)

1. THE PROCESS FOR THE PRODUCTION OF UNIFORM AND MACHINEABLE NODULAR IRON CASTINGS COMPRISING PREPARING A STOCK OF MOLTEN METAL SUITABLE FOR THE PRODUCTION OF NODULAR IRON WHEN INOCULATED WITH NODULARIZING AGENTS, PLACING IN A LADLE A QUANTITY OF FERRO-SILICON AND A QUANTITY OF MAGNESIUM BEARING FERRO-SILICON, COVERING THE MAGNESIUM BEARING FERRO-SILICON AND THE FERRO-SILICON WITH A PROTECTING LAYER OF COLD METALLIC FERROUS MATERIAL, FILLING THE LADLE PARTIALLY WITH MOLTEN METAL, INITIATING FURTHER ADDITION OF FERRO-SILICON TO THE LADLE AND CONTAINUING TO ADD SUCH FERRO-SILICON AND MOLTEN METAL SIMULTANEOUSLY UNTIL THE LADLE IS FILLED.
US188575A 1962-04-18 1962-04-18 Nodular iron production Expired - Lifetime US3113019A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367771A (en) * 1965-02-23 1968-02-06 Dow Chemical Co Process for preparation of magnesium ferrosilicon alloys
US3920451A (en) * 1974-02-15 1975-11-18 Politechnika Slaska Im Wincent Well workable, abrasion resistant nodular cast iron and a method of its production
US4396428A (en) * 1982-03-29 1983-08-02 Elkem Metals Company Processes for producing and casting ductile and compacted graphite cast irons
US4889688A (en) * 1987-11-20 1989-12-26 Honda Giken Kogyo K.K. Process of producing nodular cast iron

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675308A (en) * 1947-03-22 1954-04-13 Int Nickel Co Art of using magnesium-containing addition agents to produce spheroidal graphite cast iron
US2749238A (en) * 1949-09-10 1956-06-05 Int Nickel Co Method for producing cast ferrous alloy
US2750284A (en) * 1951-12-22 1956-06-12 Allis Chalmers Mfg Co Process for producing nodular graphite iron
US3017267A (en) * 1959-07-28 1962-01-16 Ford Motor Co Nodular iron manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675308A (en) * 1947-03-22 1954-04-13 Int Nickel Co Art of using magnesium-containing addition agents to produce spheroidal graphite cast iron
US2749238A (en) * 1949-09-10 1956-06-05 Int Nickel Co Method for producing cast ferrous alloy
US2750284A (en) * 1951-12-22 1956-06-12 Allis Chalmers Mfg Co Process for producing nodular graphite iron
US3017267A (en) * 1959-07-28 1962-01-16 Ford Motor Co Nodular iron manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367771A (en) * 1965-02-23 1968-02-06 Dow Chemical Co Process for preparation of magnesium ferrosilicon alloys
US3920451A (en) * 1974-02-15 1975-11-18 Politechnika Slaska Im Wincent Well workable, abrasion resistant nodular cast iron and a method of its production
US4396428A (en) * 1982-03-29 1983-08-02 Elkem Metals Company Processes for producing and casting ductile and compacted graphite cast irons
US4889688A (en) * 1987-11-20 1989-12-26 Honda Giken Kogyo K.K. Process of producing nodular cast iron

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