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AssigneeSnam Alloys Pvt Ltd
InventorsSrikanth Sivaraman, Gowri Subhramanyam, Nadimuthu Srinivasan, Harisankar Radhakrishnan
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The present invention pertains to a non-magnesium process to produce Compacted Graphite Iron (CGI) by placing a treatment alloy into a treatment ladle, and then placing an inoculant over the treatment alloy in the treatment ladle and pouring a molten base metal there over. The treatment alloy comprises iron, silicon and lanthanum, wherein lanthanum is 3-30% by weight of the treatment alloy, silicon is 40-50% by weight of the treatment alloy, and the remaining is Iron. Lanthanum in the treatment alloy makes the graphite precipitate as vermiculite (compacted form) instead of flake or spheroids. With extended process window offered by this new process (0.03-0.1% residual lanthanum in the metal) required to make CGI, this new process removes the stringent process control (0.01-0.02% residual magnesium in the metal) dictated by the magnesium process of making CGI.
A non-magnesium process to produce compacted graphite iron comprising by placing a treatment alloy into a treatment ladle, placing an inoculant there over in the treatment ladle and pouring a molten base metal there over, wherein said treatment alloy comprises iron, silicon and lanthanum, wherein the lanthanum is 3-30% by weight of the treatment alloy, and silicon is 40-50% by weight of the treatment alloy, wherein the treatment alloy optionally comprises at least one of calcium and aluminum in a range of 0.5-3% each by weight of the treatment alloy, and the rest of the treatment alloy is iron, and required additional percentage of said treatment alloy is 0.4-2% by weight of composition of said base metal, and said inoculant is 0.1-0.5% by weight of the composition, wherein the inoculant optionally is a ferrosilicon composition comprising at least one of calcium, aluminum, barium or lanthanum, or combination thereof.
A non-magnesium process to produce compacted graphite iron comprising by placing a treatment alloy into a treatment ladle, placing an inoculant there over in the treatment ladle and pouring a molten base metal there over, wherein said treatment alloy comprises iron, silicon and lanthanum, wherein the lanthanum is 3-10% by weight of the treatment alloy, and silicon is 40-50% by weight of the treatment alloy, wherein the treatment alloy comprises at least one of calcium and aluminum in a range of 0.5-3% each by weight of the treatment alloy, and the rest of the treatment alloy is Iron, and required additional percentage of said treatment alloy is 0.4-2% by weight of composition of said base metal, and said inoculant is 0.1-0.5% by weight of the composition, wherein the inoculant optionally is a ferrosilicon composition comprising at least one of calcium, aluminum, barium or lanthanum, or combination thereof.
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