ADDITIVE FOR TREATING MOLTEN IRON TO PRODUCE CAST IRON WITH ZERO CONTRACTION AND WITH LONSDALEITE-TYPE SPHEROIDAL GRAPHITE
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United States of America Patent
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Issued Date -
Aug 4, 2022
app pub date -
Jun 17, 2020
filing date -
Jun 20, 2019
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Abstract
Additive for the thermochemical treatment of molten iron in order to separate, distribute, agglomerate, precipitate, spheroidize and/or crystallize combined, solvated and/or colloidal carbon present in molten iron in the liquid state into graphite in its hexagonal diamond or Lonsdaleite form, in order to produce ductile, nodular, spheroidal, vermicular, coral, spheroidized or grey iron with superior mechanical properties, iron with high metal yield and zero contraction during casting; the additive comprises two or more elements in the metallic state selected from the S-block of periods 2 to 7 of the periodic table of elements; and two or more elements in the metallic state selected from F-block of periods 6 to 7 of the periodic table of elements. The additive makes it possible to produce cast iron parts with Type I and II spheroidal graphite in hexagonal diamond or Lonsdaleite form as per the ASTM-A247 standard.
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