PURPOSE: To produce a billet having no segregation in the central part of a steel ingot by pouring a molten steel into a casting mold and rolling down the steel ingot while a solid-liquid coexistence phase remains therein.
CONSTITUTION: The molten steel is poured into the casting mold and is cooled. The cooling is stopped while the solid-liquid co-existence phase remains in the steel ingot. External force is then exerted to the steel ingot to generate fine cracks to the solid phase C around the solid-liquid co-existence phase and to absorb the thickened liquid B in the solid-liquid co-existence phase into the cracks, by which the liquid phase and solid phase in the solid-liquid co-existence phase are separated. The billet having no segregation in the central part is thus produced.
| JPS51110434 | TANJAKUKOKAINO SEISEIBOSHIHOHO |
MIYASHITA YOSHIO
MUGITA MIKIO
UCHIKAWA MASANORI
WAKAMATSU IKUO
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