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US 4,227,924 AGranted
Process for the production of vermicular cast iron
AssigneeMicroalloying International, Inc.
InventorsSundaresa V. Subramanian, Debabrata S. Ghosh, John M. Gray, David A. R. Kay, Gary R. Purdy
Life of this patent
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Abstract
Process for producing vermicular cast iron comprising: (i) forming a near eutectic melt having a sulfur content preferably less than about 0.025% by weight; (ii) admixing at least one rare earth-containing additive with said melt to form stable rare earth oxysulfides thereby reducing and maintaining the Henrian sulfur activity in the melt at between about 0.004 and 0.035; and (iii) thereafter, allowing said melt to solidify.
Claims9
Process for producing vermicular cast iron comprising:
- (i) forming a near eutectic melt having a sulfur content less than 0.025% by weight;
- (ii) admixing at least one rare earth-containing additive with said melt to form stable rare earth oxysulfides thereby reducing the Henrian sulfur activity in the melt to between about 0.004 and 0.035;
- and
- (iii) thereafter allowing said melt to solidify.
1 more element
Dependencies are inferred from the claim text.