Abstract
In the former reports it was found that segregated lines of ingot showed a remarkable segregation and that some of them moreover contained sands in segregated line and cavities. On the other hand, large steel forgings forged from large carbon steel ingots revealed often defects in segregated zones, which were classified roughly into ghosts and segregation-flaws. Hitherto, while the former have been well known as the representative defect of large steel fargings, the latter have been scarecely found out, and so the former should resign the name "ghosts" to the latter.Investigatng the Λ segregated zone of ingot, the author got the idea that segregationflaw of forgings might originate in defects appearing in segregated lines of ingots. In order to confirm this idea, he investigated at first the characteristics of segregation-flaws, the time of its formation and the refation between its formation and manufacturing conditions.
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