Spheroidal graphite cast iron and method of producing spheroidal graphite cast iron, and vehicle undercarriage parts
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United States of America Patent
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Apr 2, 2024
Grant Date -
Jul 7, 2022
app pub date -
Apr 14, 2020
filing date -
May 7, 2019
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Abstract
A spheroidal graphite cast iron having a chemical composition of: C: 3.0% to 4.0%, Si: 2.0% to 2.4%, Cu: 0.20% to 0.50%, Mn: 0.15% to 0.35%, S: 0.005% to 0.030%, Mg: 0.03% to 0.06%, each by mass, and the balance being Fe and inevitable impurities, where Mn and Cu are contained at 0.45% to 0.75% in total; and a structure in which a ferrite layer encloses spheroidal graphite crystallized out in a matrix of pearlite. Part of the pearlite is extended from the matrix side to the spheroidal graphite side to divide the ferrite layer at one or more areas.
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