Method of treating cast iron

Details Method of treating cast iron Method of treating cast iron

C - Chemistry, Metallurgy

21

C

75/33, 53/34, 53

C21C 1/00 (2006.01) C22C 38/00 (2006.01)

Patent

CA 1057086

ABSTRACT OF THE DISCLOSURE A quantity of an alloy having 30-80% by weight Si; 3-15% by weight Mg; 3-25% by weight Ti; 0.05-1.0% Ce and the balance Fe, is added, as a single treatment, to molten carbon-containing iron to produce a cast iron with a compacted graphite structure. The cast irons so pro- duced combine the strength and ductility normally associated with nodular graphite irons with the better thermal con- ductivity and resistance to thermal shock normally associated with elongated flake graphite irons. Particularly preferred alloys for use in the invention have a ratio of Mg:Ti between 1:1 and 1:2 by weight, a ratio of Mg:Ce between 50:1 and 2:1 by weight, and are added to the melt in an amount between about 0.8% to 1.8% by weight of the molten iron. It is also preferred that the melt be innoculated, for ex- ample with ferrosilicon, subsequent to alloy addition.

244038

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