Assertion: ductile iron | /r/Synonym | spheroidal graphite cast iron
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text: Ductile Iron is also called ductile cast iron, spheroidal graphite cast iron, or nodular cast iron.
text: Ductile iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, is a type of graphite-rich cast iron discovered in 1943 by Keith Millis.