Additive for inoculation of cast iron and method

Details Additive for inoculation of cast iron and method Additive for inoculation of cast iron and method

2006-07-25

2006-07-25

Ip, Sikyin (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Compositions

Solid treating composition for liquid metal or charge

C075S314000, C075S316000, C075S328000, C148S321000, C164S055100, C164S056100, C164S057100, C164S058100

Reexamination Certificate

active

07081150

ABSTRACT:
An additive for increasing the toughness of thin-wall iron castings is provided. The additive includes amounts of a non-ferrous metal oxide and a metal sulfide in which the non-ferrous metal has an affinity for oxygen less than that of iron, and the metal has an affinity for sulfur less than that of magnesium. The metals contained in the oxides and sulfides are also not alkali, alkali earth or rare earth metals to reduce the incidence of defect formation in the castings. The metal oxide and metal sulfide, when added to a cast iron melt react with magnesium added to the melt as a spheroidizing graphite element to form nucleation sites having a core of magnesium oxide surrounded by magnesium sulfide. These nucleation sites allow for increased nucleation of graphite, whether in vermicular or spheroidal form, such that the cross-section of the thin-wall iron casting is more uniform, thereby decreasing the amount of carbide formed in the casting and increasing the toughness of the casting.

REFERENCES:
patent: 6102983 (2000-08-01), Skaland
patent: 6126713 (2000-10-01), Igarashi et al.
patent: 6293988 (2001-09-01), Naro
C.R. Loper, Jr., “Inoculation of Cast Iron—Summary of Current Understanding,”American Foundrymen's Society. Transactions of the AFS, 1999, vol. 107, pp. 523-528.
“Cast Iron Technology,” R. Elliott, Butterworths, London, Liquid metal Preparation, 1988, pp. 79-85,89-90.
A. Sverdlin, S. Lekakh et al., “‘Chips’—Process for Cast Iron Inoculation,”Foundry Managemnt&Technology, 1994, No. 5, pp. 31-34.
Y. Igarashi, S. Okada, “Observation and Analysis of the Nucleus of Spheroidal Graphite in Magnesium-Treated Ductile Iron,”International Journal Cast Metal Research, 11[2], 1988, pp. 83-88.

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