Method of making mg treated iron with improved machinability
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Aug 22, 2000
filing date -
Mar 6, 1998
priority date (Note) -
Expired
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Abstract
A process of producing magnesium-treated iron such as spheroidal graphite iron (SGI), compacted graphite cast iron (CGI) containing inclusions that deform plastically during machining, said process comprising the steps of: a) producing base iron; b) desulfurizating the base iron produced in step a) with a magnesium free reagent, if it is sulfur concentration exceeds 0.02 % (wt.); c) controlling the oxygen potential and temperature of the base iron to facilitate silicon control of oxygen, if the amount of oxygen exceeds 10 ppm; d) adding aluminum, calcium and/or calcium-containing oxides to the base iron in amounts designed to form dicalcium aluminate deoxidation product or low melting point calcium aluminum silicate deoxidation product; e) treating the base iron with magnesium containing inoculant to attain desired condition for desired nodularity; and f) continuing the process of producing magnesium-treated iron in a per se known manner.
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