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紧密型石墨铸铁(Compacted Graphite Cast Iron)与蠕虫状石墨铸铁(Vermicular Graphite Cast Iron)在美国是把它们区别开的。紧密型石墨在共晶团内是互相连接的;而蠕虫状石墨是不连接的。在美国较普遍应用的
Compacted Graphite Cast Iron is distinguished from Vermicular Graphite Cast Iron in the United States. Tight graphite is interconnected within the eutectic; whereas vermicular graphite is not connected. More commonly used in the United States