| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a piece of a cast with a fine solidification structure which can prevent occurrence of internal defects of a piece of the cast by adding Zr to molten steel of which solidified primary crystal isγ-Fe and producing a large amount of fine ZrO2 , which are utilized as an absorption core of molten steel to make the solidification structure of the piece of the cast finer, and also to provide a steel product which is processed from the piece of the cast. SOLUTION: The piece of the cast 25, which is provided with the fine solidification structure, is produced by continuous casting after the material containing Zr 14 has been divided into a plurality, added to the molten steel 11 of which solidified primary crystal isγ-Fe and ZrO2 has been produced in the molten steel 11. The steel product is processed from the piece of cast 25.
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