PRESENTED BY. . SUBRATA CHAKRABARTTI. . In 1949, a now well-known material called ductile iron was patented. At the same time, a lesser-known material called Compacted Graphite Iron (CGI) was also patented, though it was just considered a curiosity at that time.. While ductile iron became a manufacturing staple, CGI never was seriously utilized despite possessing some very interesting properties..
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