Process for producing compacted graphite iron castings

Details Process for producing compacted graphite iron castings Process for producing compacted graphite iron castings

B - Operations, Transporting

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22/188

B22D 1/00 (2006.01) B22D 25/00 (2006.01) B22D 27/20 (2006.01)

Patent

CA 1278908

ABSTRACT A process for producing compacted graphite cast iron thin walled shaped castings in a high productivity line is provided which comprises: (i) forming a near eutectic melt of cast iron, having a low sulfur content, preferably around 0.01% by weight; (ii) adding to the melt sufficient graphite stabilizing agents such as silicon to suppress the carbide eutectic formation at the large undercooling characteristic of thinner sections of the castings; (iii) admixing at least one rare earth containing additive with said melt to form rare earth compounds so as to reduce and maintain the Henrian oxygen activity in the melt at about 10-6; (iv) inoculating the melt in an optimum manner to promote the required degree of interconnected vermicular graphite growth, and (v) casting the resulting melt. The nucleation step is better controlled by inoculating each mold individually just prior to casting, by inoculating the molten metal as it enters the mold, or in the path of molten metal at the pouring basin, sprue or between sprue and ingate in the mold.

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