Alloys or metallic compositions – Ferrous – 1.7 percent or more carbon containing
Patent
1984-12-19
1989-02-21
Rosenberg, Peter D.
Alloys or metallic compositions
Ferrous
1.7 percent or more carbon containing
75 53, 75 58, 420 13, C21C 702
Patent
active
048061573
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.sup.-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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