Process for making cast iron
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United States of America Patent
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Apr 1, 1986
Grant Date -
N/A
app pub date -
Oct 6, 1983
filing date -
Oct 6, 1983
priority date (Note) -
Expired
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Abstract
Nodular graphite type or compacted graphite type cast iron are formed by placing a low oxygen potential slag layer over a molten iron bath, adding magnesium in an amount sufficient to reduce the sulfur content in the molten iron to 0.005% maximum and to retain at least 0.01% magnesium in the molten iron. The slag layer is maintained over the molten iron bath until casting so as to prevent oxidation of the magnesium and reversion of the removed sulfur. When nodular graphite iron is being formed, the titanium concentration is maintained below 0.05%, and an inoculant is added to the molten iron bath just prior to casting. By use of a low oxygen potential slag layer to retain the removed sulfur, casting of the molten iron can be delayed for up to 10 hours after addition of magnesium to the bath.
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