Crushable low reactivity nickel-base magnesium additive
AssigneeThe International Nickel Company, Inc.
InventorsFloyd Gotthard Larson, Jr., John Joseph DEBarbdillo, II
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Abstract
A low reactivity nickel-iron-magnesium-silicon addition alloy is provided which is particularly amenable to controlled crushing and especially useful for continuous treatment methods for producing ductile cast iron.
Claims9
In a continuous treatment process for producing ductile cast iron in which a nickel-magnesium addition agent is added to a molten stream of cast iron passing through a treatment zone, the improvement comprising utilizing as the addition agent an alloy having a composition consisting generally of, by weight, from about 3% to about 6% magnesium, from above 20% to about 40% iron, from about 2% to about 12% silicon, and the balance apart from incidental elements and impurities, essentially nickel, said nickel content of the alloy being at least about 50% and said alloy being characterized in that it is crushable without the formation of excessive fines.
A method of preparing a crushable alloy which is especially useful as an addition agent in a process for the continuous treatment of cast iron to produce ductile cast iron comprising, preparing in the form of a melt, an alloy having the composition consisting essentially of, by weight, from about 3% to about 6% magnesium, from above about 20% to about 40% iron, from about 2% to about 12% silicon, up to about 2% carbon, and the balance, apart from incidental elements and impurities, essentially nickel, said nickel content of the alloy being at least about 50% and subjecting the melt to a rapid and unidirectional cooling rate, thereby producing an alloy characterized in that it is crushable without the formation of excessive fines.
Dependencies are inferred from the claim text.