Method for producing an improved ductile iron alloy with pearlitic matrix
AssigneeVerdeloong Enterprises Pty. Ltd.
InventorsMathew Lagoon, Colin Lagoon
Life of this patent
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Abstract
A method for producing ductile iron alloys and products thereof, and in particular ductile iron alloys with at least a partial pearlitic structure, is disclosed. The improved ductile iron alloy may be used in vehicle parts, in particular disc brake rotors. The method for producing a ductile iron alloy includes heating an initial composition in a furnace to produce a molten mixture, transferring the molten mixture to an inoculation ladle, inoculating the molten mixture with an inoculant for a predetermined inoculation time to produce an inoculated molten mixture, and pouring the inoculated molten mixture into a mold to produce a ductile iron alloy with at least a partial pearlitic structure.
Claims19
A method for producing a ductile iron alloy, comprising the steps of:
- i) heating steel scrap, pig iron, and further additives, wherein said further additives include one or more of a ferrosilicon alloy, a ferromolybdenum alloy, and a recarburiser, in a furnace heated to an internal temperature of between 1400° C. and 1700° C. to produce a molten mixture comprising:
- 3.5% to 4.25% by weight carbon,
- 2.4% to 2.5% by weight silicon,
- 1% to 1.175% by weight molybdenum,
- 0.039% to 0.05% by weight magnesium,
- about 0.07% by weight nickel,
- about 0.034% by weight chromium,
- up to 0.20% by weight manganese,
- up to 0.02% by weight phosphorus,
- up to 0.02% by weight sulfur, and
- iron to make 100% by weight;
- ii) transferring said molten mixture to an inoculation ladle, wherein 0.25% to 0.55% cerium by weight of the molten mixture is added to the molten mixture;
- iii) inoculating said molten mixture with an inoculant, wherein said inoculant includes one or more of ferrosilicon, calcium, aluminum, copper, and molybdenum, for a predetermined inoculation time to produce an inoculated molten mixture;
- and
- iv) pouring said inoculated molten mixture into a mold to produce the ductile iron alloy having a structure with a partial pearlitic structure, wherein said partial pearlitic structure is 30% to 50% of the structure.
A method for producing a ductile iron alloy, comprising the steps of:
- i) heating steel scrap, pig iron, and further additives, wherein said further additives include one or more of a ferrosilicon alloy, a ferromolybdenum alloy, and a recarburiser, in a furnace heated to an internal temperature of between 1400° C. and 1700° C. to produce a molten mixture comprising:
- 3.5% to 4.25% by weight carbon,
- 2.4% to 2.5% by weight silicon,
- 1% to 1.175% by weight molybdenum,
- 0.039% to 0.05% by weight magnesium,
- about 0.07% by weight nickel,
- about 0.034% by weight chromium,
- up to 0.20% by weight manganese,
- up to 0.02% by weight phosphorus,
- up to 0.02% by weight sulfur, and
- iron to make 100% by weight;
- ii) transferring said molten mixture to an inoculation ladle, wherein 0.25% to 0.55% cerium by weight of the molten mixture is added to the molten mixture;
- iii) inoculating said molten mixture with an inoculant, wherein said inoculant includes one or more of ferrosilicon, calcium, aluminum, copper, and molybdenum, for a predetermined inoculation time to produce an inoculated molten mixture;
- and
- iv) pouring said inoculated molten mixture into a mold to produce the ductile iron alloy having a structure with a partial pearlitic structure, wherein said partial pearlitic structure is 30% to 50% of the structure and wherein said mold is for a disc brake rotor.
Dependencies are inferred from the claim text.