| 摘要 |
PROBLEM TO BE SOLVED: To provide mold powder used for continuous casting of steel by which cracks of a cast piece frequently generated in a kind of steel having high sensibility to cracking such as a medium carbon steel is suppressed, by slowly cooling the cast piece. SOLUTION: The mold powder used for the continuous casting of steel has a mass ratio of CaO/SiO<SB>2</SB>within a range of 1.8-4.0, MgO of <1.0 mass%, and Na<SB>2</SB>O of <4.5 mass%. COPYRIGHT: (C)2004,JPO
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