| 摘要 |
PROBLEM TO BE SOLVED: To cause no occurrence of inner crack in a cast piece, to uniformly disperse main segregation in a width direction and to reduce its occurrence. SOLUTION: Space of a support roll is gradually reduced so that the cast piece in whole width comes into contact with the roll until thickness of a solidified shell becomes≥70 mm. Then while bulging is applied till a position where a solidus line crater end appears, rolling reduction below bulging amount is applied. COPYRIGHT: (C)2004,JPO
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